Fertilizer production line dedusting system introduction: Baghouse filter&Blower

Fertilizer production line dedusting system introduction: Baghouse filter&centrifugal Blower

Why dust control of the fertilizer production line is important?

Worker Health and Safety: Dust and airborne particles generated during fertilizer production can pose health risks to workers if inhaled. Dedusting helps maintain a safe and healthy work environment.
Environmental Protection: Dust emissions from fertilizer plants can contribute to air pollution and environmental degradation. Dedusting systems help mitigate these emissions, reducing the plant’s environmental impact.
Equipment Protection: Dust accumulation on machinery and equipment can lead to operational issues, reduced efficiency, and increased maintenance requirements. Dedusting helps prevent these problems, prolonging the lifespan of equipment.
Local standards and regulation: a lot of countries have strict emission control because of global warming and environmental concerns therefore keeping the dust to the required standard is crucial.

Bag dust collector in dust removal system of compound fertilizer production line

The dust collector consists of an upper box, a middlebox, an ash hopper, a guide plate, a bracket, a filter bag assembly, a blowing device, an offline valve, an ash discharge device, a detection and control system, etc. The complete set of dust collectors also includes auxiliary equipment such as a maintenance platform, lighting system, maintenance power supply, and so on.
This pulse bag dust collector is an external filter type dust collector, that is, the dust-containing gas is outside the filter bag, the clean air is inside the filter bag, and the bag mouth is upward. The dust cleaning function uses differential pressure or timing and manual functions to control the online dust cleaning chamber and activate the pulse injection valve to cause radial deformation of the filter bag and shake off dust. The dust collector also has an offline maintenance function.

The working principle of the bag dust collector

Dust-containing gas enters each unit box through the inlet valves of the air inlet flue. Under the guidance of the box diversion system, large particles of dust are separated and fall directly into the ash hopper.
The remaining dust enters the filter area of the middlebox with the airflow and is filtered The final clean gas passes through the filter bag, is discharged from the dust collector through the upper box, poppet valve, and air outlet flue, and is directly discharged into the atmosphere through the fan and chimney.
As the filtration condition progresses, when the dust on the surface of the filter bag reaches a certain amount, the dust cleaning control device (differential pressure or timing, manual control) controls the current unit to go offline according to the set program and opens the electromagnetic pulse valve for injection. Shake the dust off the filter bag.
The dust falling into the ash hopper enters the pneumatic ash conveying system through the silo pump. The structural features are as follows:

How does the baghouse collect dust from the fertilizer plant?

The entire dust collector process can be simply described as controlling the resistance of the dust-laden airflow passing through the dust collector to maintain the maximum ability of the filter material to capture dust particles. This control is to periodically clean the bag to prevent Air flow resistance is too high.
After entering the air collecting box, the airflow passes through each inlet valve and directly enters each box for filtration. The airflow flow is controlled by the pressure of each filter chamber. The airflow flow in the filter chamber with low pressure will be larger. Therefore, once the pressure difference in one filter chamber is too large, more airflow (containing more dust particles) will be rushed to other filter chambers until the pressure difference in each filter chamber is equal.
In actual working conditions, the pressure difference in each filter chamber is the same. If the pressure difference in the filter chamber is higher (higher than the set value), the chamber will enter the dust cleaning process; if the pressure difference in one of the filter chambers is always high If there is no obvious drop after cleaning, it means that the filter bag in that chamber is blocked; if the pressure difference in one of the filter chambers is always low or drops suddenly (lower than the set value), it means that the filter bag in that chamber is damaged.
The upper part of the ash hopper (middle box) is equipped with an air inlet duct, through which the airflow enters the filter chamber. The airflow distribution system in the ash hopper air inlet duct evenly distributes the airflow to the entire cross-section of the filter chamber. The filter bag in the filter chamber is installed on the flower board.
When the dust-laden airflow passes through the filter bag and enters the clean air chamber (this process is the filtration process or dust removal process), a layer of dust (powder cloth layer) is left on the outer surface of the filter bag. Compared with the filter bag material, the ash layer is finer. Small dust particles are trapped by the dust layer and would otherwise be able to pass through the filter bag. Therefore, when a new filter bag is first put into use, very fine dust particles will penetrate the filter bag and escape, forming a plume of smoke at the chimney’s mouth. When the powder layer is formed, the plume of smoke will disappear.
To prevent the pressure drop of the filter material from being too large, the filter bag must be cleaned periodically. Cleaning the filter bag is not to completely remove all the dust layer on the filter bag. After cleaning, a small amount of the remaining powder layer composed of very fine dust particles will be used to capture smaller dust particles in the next dust removal process. Dust cleaning is realized by pulse airflow, and the dust cleaning process is carried out room by room and row by row. The filter chamber is online when performing the dust cleaning process. The smoke’ (passes through the filter bag, removes most of the dust particles, passes through the air outlet pipe and induced draft fan, and is finally discharged from the chimney.

10 things to Inspect before trial operation of bag dust collecting system

Cleaning: After the dust collector is installed, a comprehensive inspection of the dust collector should be carried out to remove all debris inside the dust collector: including welding slag, welding rod heads, gas-cutting residues, gloves, cigarette butts, etc. These cleaning tasks can be completed using compressed air. When removing debris, the ash hopper unloading valve should be removed (the debris will be discharged from the ash hopper outlet)
Inspection: All flanges of the dust collector should be lined with sealing materials to ensure sealing. All manhole covers and inspection doors should be pressed tightly, the sealing strips should not be missing, and there should be no air leakage.
Check whether the filter bag is installed intact and there is no missing installation;
The seams of all filter bags should face the same direction (back to the air inlet). Check whether the spring expansion ring at the filter bag mouth is in good contact with the flower board. The spring expansion ring is fully stretched without wrinkles;
Check whether the bag cage and the filter bag fit tightly, and the bag cage is vertical without bending;
The blowpipe is firmly fixed, whether the nozzle is vertical, without deflection, and well aligned with the filter bag: ⑤ The offline valve and bypass valve move flexibly, without blocking, and the valve plate is in good contact with the offline valve port, and whether the cylinder stroke is appropriate ;
Whether the seal of the air inlet regulating valve is good and whether the valve rotates flexibly:
Whether there is no air leakage in the compressed air system, whether lubricating oil has been filled in the pneumatic triple oil cup, whether the oil level is appropriate, and whether the setting of the pressure-reducing valve is at 0.3 *0. AMpa, whether the safety valve is set at 0.4Mpa.
Verification schematic diagram;
Insulation inspection after cable installation and before excitation

Dust collector bag pre-spraying operation instructions

The reason why the dust collector bags need to be pre-sprayed is to extend the service life of the dust bag. Because some filtered dust is highly corrosive, if pre-spraying is not performed, the service life and dust removal effect of the dust bag will be greatly reduced.

Open all inlet valves and outlet valves, turn on the fan at 80%, observe the differential pressure transmission port of the four chambers, and adjust the inlet valve to ensure that the pressure difference between the four chambers is consistent, indicating that the air volume distribution in the four chambers is consistent; And prepare the opening position of the inlet valve;
Turn off the compressed air or turn off the injection signal, so that the injection system is non-working;
Open the air inlet regulating valve of the first filter chamber and close the other three valves;
Open all offline valves in the first warehouse;
Turn on the fan and open the fan inlet air volume regulating valve to 20% to 30%;
Feed Ca(OH)2 from the pre-spraying device to the dust collector; when the differential pressure in a single chamber reaches 200300Pa (the amount of Ca(OH)2 dust fed in each chamber is 300Kg400Kg), repeat the second, third and fifth steps in sequence. Pre-spray the second, third, and fourth warehouses.
After the pre-spraying is completed, open all inlet and outlet valves (do not activate the bypass valve), turn on the compressed air and blowing signals, and when Ap reaches 900Pa (powder cake is formed), start cleaning the filter bag;
The correct operation of the dust collector is directly related to whether the filter bag can achieve its optimal performance and effectively prevent premature failure of the filter bag.

What is the order to start the dust collector?

Before starting the induced draft fan, the poppet valve or bypass valve should be checked to ensure that at least one of them is in the open position. Prevent the fan from being started when the poppet valve and bypass valve are in the closed position. This will seriously damage the motor, poppet valve and bypass valve.
Clean and inspect the dust collector before starting it.
After starting, the dust collector will filter the dust-containing gas to achieve the dust removal effect and perform the dust cleaning process online. Often, the best indicator of dust collector performance is the pressure drop in the dust collection system. In particular, the pressure drop in a single filter chamber of the dust collector is the best indicator of the condition of the filter bag.
A sudden increase or decrease in pressure drop means that the filter bag is clogged, leaking, the valve does not operate, the dust cleaning system fails, or the dust hopper accumulates dust. excessive. To protect the filter bag, the maximum pressure drop in each filter chamber shall not exceed 900Pa.

How to operate bag dust collector in PLC main control room

PLC main control cabinet dust cleaning control: When the third-speed selection button is selected in manual control mode, there are two knobs and two buttons on the PLC main control cabinet in working condition, which can control the lift valve switch, bypass valve switch, Pulse injection, fault reset.
When controlling the opening and closing of the poppet valve and bypass valve, there are corresponding action indicators (lights) on the PILC main control cabinet. If a work failure occurs, there are corresponding fault alarm indicators (lights).
Press the pulse injection button, and all pulse valves on site will be injected once in sequence. If you want to continue blowing, you can press it again. Each time you press it, the pulse valve will blow out one time in sequence (if the system is in pulse blowing, this button is not in working condition, and pressing this button will be ineffective.
When the system sends out an alarm signal and the operator wants to stop the system’s injection, he can press the fault injection button to facilitate on-site maintenance.
When the third gear selection button is selected in the automatic control mode, the two knobs and two buttons on the PLC main control cabinet will be invalid. The automatic control adopts the pressure difference (constant resistance) control mode. There is a total differential pressure on the PLC main control cabinet. The instrument displays the actual value. The differential pressure value can be set on this instrument. When the set pressure differential value is reached (800900Pa), the system will start cleaning. If the dust collector resistance is still higher than the set value after one cleaning, the dust cleaning will continue. If during the dust cleaning process, the dust collector resistance drops below the set value, the dust cleaning process will stop after completing one cycle until the dust collector resistance exceeds the set value, and the next dust cleaning process will start. The execution of this dust cleaning program is directly controlled by the main control cabinet (PLC low-voltage cabinet).
When the third gear selection button is selected in the timing control mode, the two knobs and two buttons on the PLC main control cabinet will be invalid. There is a timing meter on the PLC main control cabinet, which displays the actual value of time. Timing control: selection switch Select the “timing” position, and after the system meets the timing control conditions, the system will automatically start cleaning for one week. When the timing control conditions are met next time, the system will start blowing for another week, and so on.

Dust collector PLC main control cabinet instrument and industrial computer operating instrument

The PLC main control cabinet of the dust collector has a total of 6 instruments, which are 1-4# differential pressure, air inlet temperature, total differential pressure, and timing.
Differential pressure: Displays the pressure difference in chambers 1, 2, 3, and 4. Based on this pressure difference, the operation of each chamber can be observed.
Air inlet temperature: Displays the smoke temperature at the air inlet.
Total pressure difference: displays the pressure difference between the air inlet and the air outlet. According to this instrument, the constant resistance injection control mode can be set.
Timing: When using the timing injection control mode, the time can be set according to the instrument.
The dust cleaning process of the dust collector can be started manually by the operator on site. On-site operation via on-site operation box. There is an automatic/manual knob on the injection site cabinet. When the operation on the automatic, that is, the PLC main control cabinet is valid, the operation of other local knobs is invalid. If it is manually on, the operation on the PLC main control cabinet is invalid, and the operation of other local knobs is valid.
At this time, any knob on the cabinet panel will be working. There are 16 airbag-blowing selection buttons. When a button is in the open position, the airbag will be blown (if the air source pressure allows, multiple airbags can be blown at the same time). There are four poppet valve switch knobs and two bypass valves. Switch knob. A power indicator and an emergency stop button. When you want to turn off the power on-site, you can press this button.

Operation after starting the dust collector

After starting, a powder layer will form on the surface of the filter bag, and the dust collector will perform the dust cleaning process online. Often, the best indicator of dust collector performance is the pressure drop in the dust collection system. In particular, the pressure drop in a single filter chamber of the dust collector is the best indicator of the condition of the filter bag. A sudden increase or decrease in pressure drop means that the filter bag is clogged, oleaking, the valve does not operate, the dust cleaning system fails, or the dust hopper accumulates dust. excessive. To protect the filter bag, the maximum pressure drop in each filter chamber shall not exceed 900Pa.
Cleaning of filter bags: The pulse cleaning control adopts manual and automatic methods, which can be converted to each other. The automatic control adopts two control methods: pressure difference (fixed resistance) and timing, which can be converted into each other. The pressure difference detection points are respectively set at the inlet and outlet main pipes of the dust collector. When the set pressure difference value is reached (800900Pa), the dust collector Each room is cleaned by pulse injection in sequence, and the execution of the cleaning program is directly controlled by the main control cabinet (PLC low-voltage cabinet).
Timing control: Select the “automatic” and “timing” positions of the selector switch. After the system meets the timing control conditions, it will complete the cleaning work of all rooms in sequence.
Fixed resistance control: The selector switch selects the “automatic” and “fixed resistance” positions. When the differential pressure of the dust collector reaches the set value, the dust cleaning process starts: the dust cleaning indicator light in room #1 lights up and the blowing starts. After the blowing is completed, After 5 seconds, the next warehouse will start working, and the dust cleaning work of all warehouses will be completed in sequence. If the dust collector resistance is still higher than the set value after one cleaning, the dust cleaning will continue.
If during the dust cleaning process, the dust collector resistance drops below the set value, the dust cleaning process will stop after completing one cycle until the dust collector resistance exceeds the set value, and the next dust cleaning process will start.
Shut down the dust collector: Use PLC to shut down the dust collector. The lift valve of the dust collector will close, and then manually close the air inlet regulating valve (note: the ash conveying system cannot be shut down during the dust cleaning process of the filter bag or when there is still dust accumulated in the ash hopper. When inspecting or repairing the inside of the dust collector, a sign must be hung to prevent someone from suddenly opening it.

How to turn off a baghouse dust collector

After shutting down, clear the flue gas in the filter chamber of the dust collector, because the flue gas contains a lot of water vapor and its condensed gas.
Clean the filter bag 3-5 times before the dust collector cools down.
empty the dust in the ash hopper.
Close the ash conveying system.
Start the induced draft fan and spend about an hour cleaning the dust collector.
Turn off the induced draft fan.
Use the exhaust fan for ventilation before entering the filter room, and close each inspection door promptly after the inspection is completed.

Daily/weekly/monthly maintenance plan instructions for baghouse dust collector in compound fertilizer plant

All maintenance related to filter bags can be performed in the clean air room. The flip-up cover on the top of the dust collector is used for inspection and replacement of filter bags, etc. The dust collector has an inspection platform for inspecting and maintaining related dust cleaning systems, electronic control equipment, valves, and other equipment. The following items are maintenance procedures that must be checked periodically to promote “trouble-free operation”:
Every day: Conduct a patrol inspection of the pressure drop, valves, cylinders, and operation of the air inlet and outlet valves in each warehouse, and make records at least every two hours;
Weekly: Observe the entire cleaning cycle system to confirm that the cleaning cycle, the operation of the air inlet and outlet valves, and the PLC operation are normal. Check the door seal condition
Monthly: Conduct detailed inspection of all inlet and outlet valve controllers, solenoid valves, motors and equipment according to their operating functions
Every year: Randomly select one or two filter bags from each filter chamber, analyze and predict the service life of the filter bags and the need for replacement.
Once there is an opportunity, or at least once a year, check the possible dust accumulation on the panels in each filter chamber of the dust collector in the clean air section, the condition of the filter bags, the dust accumulation in the ash hopper, the performance of the electrical components, the sealing and sealing of each valve Check the air leakage and maintain the components:
Filter bags: Check the clean air chamber and filter bags regularly. You can also check for dust, water vapor, or rust spots based on abnormal fluctuations in the differential pressure in the chamber. Once the above situation occurs, it means that the filter bag is damaged or the operating conditions are incorrect.
Electrical control components: Like other components of the dust collector, the electrical control components do not require regular service. However, we recommend that they be inspected during regular intervals. Solenoid valves and other integrated components can be inspected by replacement. It is recommended that broken components be sent to the manufacturer for repair.
Electromagnetic pulse valve: Opening failure may be caused by continuous operation, accumulation of internal impurities, excessive wear of the diaphragm, or a worn piston blocking the shell tube. Diaphragm valve opening failure can be detected by excessive compressed air consumption, pressure drop in the compressed air pipeline, or continuous leakage sound of the valve. After finding the cause of the problem, first remove the system pressure, then remove the valve cover, and check whether there is any debris in the seal of the diaphragm, whether the diaphragm is damaged, and whether the spring has failed. Do not attempt to disassemble the diaphragm valve without removing system pressure. The cause of shutdown failure may be too weak an excitation signal, coil failure, accumulation of internal impurities, or excessive piston wear. Diaphragm valve closing failure detection can be checked by an excessively soft pulse sound when energizing the solenoid valve. If the solenoid valve does not move or the solenoid part moves but the valve does not move, it means there is a problem with the s valve or controller, and needs to be replaced. Inspection of the solenoid valve includes whether all connections are tight and whether the valve operates normally when the power is disconnected.
Dust collector condition: The water vapor phenomenon in the dust collector room, like small puddles or rust spots, is caused by the condensation of water vapor or acid in the hot flue gas or leakage from the outside. The water vapor problem is caused by the condensation of hot flue gas due to low operating temperature. If the water vapor is caused by leakage, the best way to plug the leak is to clean it first and then embed it with epoxy or silicone sealant. Use sealing welding to plug leaks, but the filter bag must be removed or covered before welding to prevent damage from welding sparks, which may be fatal to the filter bag. Leakage from access doors is usually due to improper tightening of the door or a problem with the gasket. Tighten the inspection door correctly and replace aging and deformed seals to solve the leakage of the inspection door.
Pressure drop of dust collector: The pressure drop of the system is the best reflection of the performance and status of the dust collector. Create an operational log. Keeping an operation log helps plan maintenance and filter bag replacement. Abnormal pressure drop signals indicate that we should check immediately! A too low-pressure drop indicates that there is a leak in the system. Check whether there is smoke from the chimney and whether there is dust on the ceiling. There are many reasons for excessive pressure drop: filter material blockage, dust cleaning system failure, inlet and outlet air valve failure, excessive dust accumulation in the ash hopper, and pipeline blockage of the pressure difference gauge.
Filter bag: If the filter bag is damaged during the warranty period, there must be a replacement record, recording the location of the replacement chamber and filter bag, the replacement date, and submitting the damaged filter bag to the supplier for analysis.

How to remove baghouse filter bags: 5 steps

Close and lock the inlet and outlet air valves of the filter chamber:
Carry out 3-4 dust cleaning operations on the filter chamber to be entered;
Open the door of the room for ventilation, and confirm that the filter room is cool before entering. During the process of entering, personnel should use a fan to continuously blow fresh air inside;
During operation, keep the inspection door of the ash hopper open;
To replace a filter bag, the filter bag and bag cage should be pulled out from the top. Sometimes it is necessary to pull out several filter bags to check the specific situation.

Possible causes of filter bag damage:

The dust accumulation in the ash hopper is too high, resulting in secondary dust emission, and a large number of dust particles in the high-speed a cause filter bag wear.
Failure to install them properly causes friction between the filter bags.
The bag cage is corroded, damaged or bent.
Excessive dust cleaning will shorten the service life of the filter bag;
When inspecting the filter bag, it was found that there were several lines of abnormally thick gray layers, indicating that there was a fault in the output of the electromagnetic pulse valve or a specific pulse controller. The fault-finding process requires first looking for electrical faults.
Abnormal dust accumulation on the top of the flower board indicates that the filter bag is damaged. Before resuming work, the filter bag should be replaced and dust removed.
The dust collector controller can be turned on only when all conditions for startup and operation are met.
For other unknown faults, please report them to the equipment manufacturer in time.

Installation guide of pulse bag dust collector

The process layout, equipment drawings, and equipment components must be verified and understood.
Accept and inspect the reserved holes, embedded steel plates, and space dimensions of the civil construction to see if they are consistent with the design, and verify them with the actual equipment. If correct, install them. If there are differences, they will be installed after processing.
Installation of ash hopper (if there is no dust collector with ash hopper, this is not required).
The ash hopper is allowed to turn 180 degrees. The four corners of the ash hopper should fall on the embedded steel plate. The feeding opening of the ash hopper should be consistent with the center of the reserved feeding opening. The misalignment between the footings and the embedded steel plate should not exceed 1/4 of the size
Upper box installation
Before hoisting the upper box, open the upper box cover (screw-fastened) and check whether the blow pipe has slipped during transportation. The upper box is hoisted and placed above the ash hopper. The flange holes of the upper and lower bodies are aligned and connected with bolts. The middle pressure is sealed with asbestos rope (large equipment requires electric welding and does not have flange holes). Pay attention to the direction when installing. The side where the fan is discharged should be on the side of the reserved air outlet.
Installation of air inlet (dust collector without ash hopper, this is not required)
The air inlet pipe is welded to the air inlet of the ash hopper. Its direction is determined according to the process requirements. The installation height and the length exposed outside the ash hopper are determined according to the selection. Note: The air inlet and outlet are in symmetrical directions
Installation of air outlet: There is a smoke outlet on the side of the upper box clean room, which is connected to the fan through pipe welding.
Gas line installation: For the installation of the reserved port on the pulse valve drum, there is an air inlet on the side of the drum, and the air compressor is connected to the side air inlet of the drum through the air inlet pipe and oil-water separator (the air compressor pressure must be ensured 5 kg, if it exceeds 5 kg, please install a pressure reducing valve). There is a drain outlet in the middle and lower part of the steam drum, and the clearance valve and pipe fittings are connected to the drain switch to avoid air leakage.
Pulse controller connection (circuit installation)
Directly connect the two power supplies (220V) to the wiring port of the controller. The controller has been debugged before leaving the factory.

Things to note when installing bag dust collector

Before installation, you must read this manual carefully and check the quantity and quality of all parts on the installation and shipping list.
Install in order. Each step must be quality-checked to ensure it is accurate.
When lifting the equipment, attention should be paid to preventing deformation. When the equipment leaves the factory, lifting rings are welded to key components to facilitate lifting.
After the upper box, ash hopper, etc. are installed, all links should be sealed and air-tight. If welding and sealing are required, tight welding must be performed. If fasteners are used for connection, sealing gaskets must be added and all fasteners must be tightened.
During installation of the baghouse filter, hard objects should be prevented from scratching the bag. During welding construction, sparks should be prevented from falling on the bag inside the equipment and igniting the filter bag.
After installation, the dust collector must be cleaned of debris in the air chamber and ash hopper.

General frequently asked questions FAQ baghouse filter dust collector

If the equipment is installed on a boiler, it must be ensured that the temperature of the flue gas entering the bag dust collector cannot exceed 200 degrees. If the flue gas temperature exceeds 200 degrees, please install energy-saving waste heat equipment in front of the bag dust collector.
If the equipment body is not insulated, the equipment must be installed indoors to ensure that the equipment does not reach the dew point during operation.
③ If the equipment is not installed in time after entering the site, the equipment should be moisture-proof, waterproof, dust-proof, and fire-proof to prevent the bags inside the equipment from getting damp.
Cylinders, conveyors, and induced draft fans must be inspected and refueled regularly, 1-2 times a week. Pneumatic triplexes, air compressors, and airbags must be refueled and drained frequently, once per shift.
During the normal operation of the dust collector, the operator must monitor the inlet and outlet temperature of the dust collector and the main fan current, and make records, usually once every half hour.
The management of the shutdown, start-up, and shutdown process of the dust collector must be strictly carried out by the relevant provisions of the first clause of this regulation.
Cylinders, solenoid valves, electrical components, motors, and control cabinets must be kept clean.
When operating manually, remember to unload the ash first (manually open the ash unloading valve at the bottom of the box) and then clean the ash.
Regularly check the sealing condition of the cylinder, solenoid valve, flange surface and access door. If air leakage or an aging sealing strip is found, replace it in time, and observe the temperature of the smoke entering the bag dust collector to ensure that the smoke entering the bag dust collector is The air temperature cannot exceed 200 degrees. If there is any abnormality, stop the machine immediately for investigation.
Regularly check the gas pipeline system and ash discharge work. If any abnormality is found, the cause should be identified and eliminated in time.
Be sure to observe the ash storage situation in the ash hopper, unload the ash in time, and clean the ash promptly. The frequency must be high. Every half hour, the operator manually unloads the ash from the lower hopper of the bag dust collector and uses a square log or stick to knock the dust on the inner wall of the upper box. When the equipment is shut down, turn off the induced draft fan, delay the injection of the pulse valve of the bag dust collector for 1 to 2 hours, and then turn off the power of the pulse valve.
If the equipment is used in a boiler, the fuel must be kept clean and pure and cannot be mixed with garbage for combustion. When burning coal, try not to put water on the coal. When adding coal to a hand-fired coal boiler, the whole coal should be added to prevent coal powder from entering the furnace and forming sparks, which will affect the life of the bag. Biomass boilers must ensure the dryness of the fuel. If the moisture content of the fuel is high, the ash unloaded from the ash hopper of the pulse bag dust collector will be divided into flakes or lumps. The normally unloaded ash should be in powder form. In this case, When necessary, fuel with better dryness should be replaced in time.
If the bag dust collector equipment is installed on a new boiler when the boiler is drying the furnace, the flue should be bypassed (or the bag should be extracted), and the flue gas cannot be filtered directly through the bag dust collector.
If the filter bag catches fire (the box turns black), turn off the induced draft fan and cut off the power supply immediately.
If condensation occurs on the filter bag, please insulate the equipment body (rock wool insulation) in time

Requirements before trial operation of dust removal fan/centrifugal blower

Inspect according to drawing requirements. In particular, important installation dimensions such as the clearance between the collector and the impeller and the coupling must be ensured, and the bolts of each part must not be loose.
Ensure the horizontal position of the spindle. The main shaft of the fan and the motor shaft must be on the same axis, and the coaxiality tolerance is ≤0.05mm.
The adjusting door of the dedusting centrifugal blower cannot be installed backward, and the air inlet direction must be consistent with the impeller rotation direction.
All connecting flange surfaces of the casing should be sealed with seals to ensure tightness and aerodynamic efficiency.
Check whether the bearing seat oil level and cooling water are normal, and whether the adjustment door operation is flexible and reliable.
After the fan is installed, the manual turning should rotate flexibly without jamming, over-tightening, or friction.
Conduct a comprehensive inspection after the fan is installed. Whether the manhole door is closed properly, and no foreign objects such as wood blocks, welding rod ends, iron wires, and gravel should remain in the air duct.

Trial operation of dust removal fan

The mechanical operation test is conducted under no-load conditions. After proving that the operation condition is good, it can be operated at full load for the specified time and can be put into normal operation only after passing the inspection.
Continuous operation time under normal operating conditions:
The trial operation shall be no less than 30 minutes after maintenance and installation;
The trial operation shall be no less than 2 hours after the new installation;
During the trial operation, pay attention to the temperature and vibration conditions of the fan operation, adjust the flexibility of the system, observe whether it can meet the needs of the boiler output parameters and keep records.
During cold trial operation of the induced draft fan, the maximum opening of the adjustment door shall not be greater than 70% of the full opening.

6 preparations that need to be made before starting the fan:

Clear the debris inside the machine and close the manhole door and adjustment door.
Turn the machine to check the gap size of each part of the fan, and whether there is any friction or collision between the rotating part and the fixed part.
No one is allowed to stand next to the impeller and coupling to avoid danger. The coupling must be equipped with a protective cover.
Check whether the oil level is within the normal oil level line (online before starting the machine)
Check the electrical wiring and instruments to see if they are normal.
Check whether the cooling part is normal. When the fan starts and the speed reaches normal, gradually open the adjusting door until it reaches the required position.

Conditions for emergency shutdown of dust removal fan

If the following conditions occur during the operation of the fan, it should be stopped immediately for inspection.
It was found that the fan made a strong noise.

The bearing temperature rises sharply.
The fan produces severe vibration and impact.
The motor current is too large and the temperature rises sharply, making correction ineffective.
Bearing water seepage or serious oil leakage.

Precautions during normal operation of the dedusting centrifugal blower:

When the flow rate is too large or when a smaller flow rate is required, the adjustment door can be used for adjustment.
Check the sensitivity of the thermometer and oil mark.
If any abnormality is found during the starting, stopping, or running of the fan, check it immediately.
Regular maintenance and troubleshooting to facilitate normal operation.
Lubricating oil should be replaced after maintenance. Under normal circumstances, it should be replaced once every 3 to 6 months, and all should be replaced 1 to 2 weeks after the first operation.

Precautions for dedusting fan maintenance work:

Before installing the fan, attention should be paid to the maintenance of the rotating group (including bearings) and various electrical equipment.
The fan must be operating under normal conditions and must be inspected by a dedicated person.
After the fan is started for maintenance, attention should be paid to the normal status of each part.
Regularly clean the dust, water, etc. inside the fan to prevent corrosion.
Frequent or regular inspection items.

Conclusion:

In conclusion, both baghouse filter and centrifugal blower dedusting systems play critical roles in maintaining air quality and operational efficiency in various industrial settings, including fertilizer plants. Baghouse filter systems utilize fabric bags to capture dust particles, ensuring clean air emissions. These systems are highly efficient and can handle large volumes of air with minimal pressure drop. With proper maintenance, baghouse filters offer long-term dust control solutions and contribute to environmental sustainability by reducing air pollution. On the other hand, centrifugal blower dedusting systems rely on centrifugal force to separate dust particles from air streams. These systems are particularly effective in applications where high airflow rates and moderate dust loads are present. Centrifugal blowers are versatile and can be integrated into various industrial processes, providing reliable dust extraction and ventilation solutions.