Precautions for bag dust removal, what should be paid attention to when dust bag is processed?

A dust collection hood is set up in each ash place, and the dust-containing gas is transported to the dust removal device through the pipeline gas path, in which the dust is collected in the dust removal device after the gas-solid separation is carried out, and the clean gas is introduced into the main pipe or directly discharged into the whole set of equipment into the atmosphere, that is, the dust removal system, and the dust collector is an important part of the system. From the perspective of ventilation and dust removal, dust is all solid small particles that can float in the air for a long time, and is a dispersion system, called aerosol, in which air is the dispersed medium and solid particles are the dispersed phase. A dust collector is a device that separates these small solid particles from aerosols.

1) The old cloth bag of the new process should not be mixed to avoid the normal operation of the dust removal equipment due to different damage times.

2) Aging of cloth bags. If it is mainly caused by the following reasons, it is necessary to investigate the cause, take elimination measures and replace the dust removal filter bag. hardening and shrinkage due to abnormally high temperatures; due to vapor contact reaction with acids, alkalis or organic solvents; Reacts with moisture.

3) The filter cloth should not be hung too loose or too tight, too loose is easy to accumulate dust, too tight is easy to pull bad.

4) Replace the cloth bag, first blow it with compressed air, and then check whether there are holes, and leave them for replacement after the holes are repaired. If the cloth bag is covered with dust, rinse it with water, cool and dry it before leaving it to be replaced.

5) Blockage of dust removal bags. When the bag is clogged, the resistance increases, which can be expressed by the increase in the reading of the differential pressure gauge. Bag blockage is the main cause of bag wear, perforation, falling off and other phenomena.

The causes of the blockage of the dust bag are checked and repaired in the table below. Generally, the following measures are taken: Temporarily strengthen the cleaning of the ash to eliminate the blockage of the bag; Partial or total replacement of cloth bags; Adjust installation and operating conditions.

How to use the dust collector bag and precautions:

1) Before the dust collector is put into operation, the dust removal filter bag should be pre-coated, and a dust layer should be formed on the surface of the dust removal filter bag in advance, so that the dust layer can block the packaging of oil mist and acid in advance, so as to avoid direct contact between oil mist and acid and the surface of the dust removal filter bag, and avoid the occurrence of oil mist blockage, condensation and bag pasting.

2) Choose a reasonable ash cleaning system structure, set a reasonable ash cleaning pressure, ash cleaning cycle and ash cleaning control mode, and avoid dust blockage, especially if excessive ash cleaning is not advisable, this is because excessive ash cleaning will affect the service life and filtration performance of the dust removal filter bag.

3) The dust collector inlet waste should be evenly divided into each dust removal filter bag, and the uneven breeding load will make some dust removal filter bags overloaded.

4) Reasonably match the diameter of the bag cage and the dust filter bag. For synthetic fiber felt filter material, the inner diameter of the general dust removal filter bag can be 5mm larger than the outer diameter of the bag cage, such as the dust removal filter bag of 130, the outer diameter of the bag cage is generally designed to be 125, and for the glass fiber dust removal filter bag filter material, the difference between the two diameters should be reduced to 2 3mm, and the friction resistance felt during installation is not easy to put down. Because the shrinkage rate of glass fiber is 0 in the environment below 280, the size of the dust filter bag is very stable, and the bag cage expands when heated, and the dust filter bag can be tightly attached to the bag cage during normal operation, and the dust cleaning is mainly bent and vibration to clean the ash, and there will be no collision between the dust filter bag and the bag cage steel wire, so as to reduce friction to the limit.

5) For the long dust removal filter bag, the injection air flow should have a drainage device, and the high-pressure air flow should be aimed at the center of the dust removal filter bag, instead of directly impacting the dust removal filter bag and causing damage to the dust removal filter bag. At the same time, the size of the aperture at different positions on the blowing pipe should be different with the distance of the air bag, and the dust removal filter bag cleaning function at different positions is basically the same.

6) Strictly prevent long-term over-temperature operation. The filter material should be used at the temperature, and the long-term over-temperature operation will affect the service life of the dust removal filter bag, so appropriate measures should be taken to control the temperature of the dust collector.

7) Select the appropriate filter material according to different working conditions. The selection of filter media should be based on the temperature, temperature and chemical characteristics of the gas; Factors such as particle size, weight, shape, dust concentration, filtration speed, cleaning method, emission concentration and working system of the bag filter are comprehensively considered. Under normal circumstances, needle felt is used for pulse jet bag filters, and woven fabrics are used for chamber back-blowing bag filters or mechanical vibrating bag filters.

1. Preparation before starting.

1.Confirm that the dust collector bag is in good condition, and replace it in time if it is damaged or pasted.

2.Confirm that there is oil inside the lubricator

3.Drain the water inside the oil-water separator.

4.Make sure the inspection door is sealed.

5.Confirm that each bolt is tightened.

6.Confirm that the compressed air is unobstructed and the pressure meets the requirements.

1. Hydropower precautions.

1. Waterproof construction should be waterproofed by coating film.

2. The waterproof project should be done after the acceptance of the concealed project.

3. After the waterproofing is done, 2 water storage tests should be done.

4. The waterproof layer of the bathroom should not be lower than the meter.

5. Floor drains, pipelines and other places should be waterproofed more than once.

6. The floor drain should be deodorized.

7. The hot and cold water pipes are hot on the left and cold on the right.

8. Try not to walk on the ground from the water pipe.

9. The cold water pipe should have a protective layer of 1cm, and the hot water pipe should have a protective layer.

10. The bucket should be bought large.

11. The faucet and basin should be matched.

12. Silicone should be used for toilet installation.

13. After the toilet and faucet are installed, they should be taken care of.

14. When buying a toilet, consider the pit distance of the toilet.

15. The washing machine should consider whether it is an upper drain or a lower drain.

16. Don't install ** in the bathroom.

17. The size of the mirror in the bathroom should be considered.

18. Bathroom pipes should be left with manholes.

19. Strong and weak electricity cannot be worn in the same tube.

20. The left zero and right phases are grounded.

21. The power socket is 300mm from the ground, and the switch is meters.

22. Do not install the switch behind the door.

23. There are many sockets.

24. The cassette should be used well.

25. The cassette must be matched with the panel.

26. The air conditioner in the bedroom should not be facing the bed.

27. The air-conditioning hole should be tilted outward.

28. Try to consider dual control of the lamp.

29. It is best to install a splash-proof socket in the bathroom.

30. Consider a socket on the table.

31. The wire duct should be horizontal and vertical, and the photo should be arranged.

32. The public flue should be equipped with a check valve.

2. Precautions for masonry.

1. The cement cannot be used for more than three months after the factory period.

2. Different varieties and grades of cement cannot be mixed.

3. Yellow sand must be made of river sand.

4. The wall and floor tiles should be soaked in water for more than 2 hours, and they can be pasted after drying.

5. It is better to buy a few more wall and floor tiles, not less.

6. There can be no two rows of non-whole bricks on one wall.

7. Clean the tiles immediately after the joint is completed.

8. The ground is pasted with marble, and the back of the stone should be waterproof.

9. The sunny angle should be cut at a 45-degree angle.

10. The floor tiles should be inclined to the floor drain to avoid water accumulation.

11. The ground marble should be dry-paved.

12. The floor tiles must be dirt-resistant and non-slip.

13. Matte tiles are difficult to clean.

14. Pay attention to the drainage direction of balcony floor tiles.

1. Preparation before driving.

1) Keep the dust collector and fan clean, and there is no debris on each equipment platform;

2) Check the fan and motor. Whether the bolts of each joint part are tightened. The oil level is accurate, and there is no dripping phenomenon;

3) Electrical inspection: the power supply of the control cabinet is in place to ensure that the line sequence is correct. (Ensure that the direction of rotation and ash conveying of fans, spiral ash conveyors, humidifiers and other electric components is correct; The neutral and ground wires are connected correctly).

2. Check the air circuit system before starting.

1) Before the operation of the gas system, each pipeline must be swept for 20 30min.

2) Check the air supply to ensure that the compressed air pipeline is unblocked, adjust the air supply pressure on the left and right, and then open the air pressure valve to supply air to the air bag; Ensure the pressure and air volume required for the operation of the dust collector;

3) Open the valves step by step, and adjust the pressure of the pressure reducing valve in front of the pulse injection mechanism.

4) Open the air bag blowdown valve, drain the oil and water and close it.

5) Check the gas circuit components at all levels on the dust collector one by one to check whether there is water accumulation, leakage, gas running and other phenomena in the gas circuit.

6) Check and confirm that the gas path is clear.

7) Check the operation and integrity of the pulse valve (check whether the exhaust hole of the pulse valve is exhausted).

8) Check whether the pulse air bag pressure is normal.

9) Check whether the water filter and oil filter are normal.

10) Check whether the lubricator is loaded to 2 3 places of the oil mark (transformer oil, add after one month of operation of the new equipment).

Note: The pressure at the nozzle of the new filter bag is maintained and adjusted after three days.

3. Inspection of the main equipment of the dust collector.

1) Check the operation of the ash cleaning valve, whether the action is reliable and in place.

2) Check and test the screw ash conveyor and ash discharge valve to ensure that the ash conveying equipment works normally and whether there is any jam phenomenon; And clean up the ash and debris in the hopper.

3) Check the pipes and joints to ensure that there is no leakage, no dust accumulation and blockage; Confirm that the pipe branch valve is open; Inspect each inspection door to ensure that it is well sealed;

4) The control box is opened normally and meets the requirements.

4. System operation and operation.

Prepare for the operation of the system, and the dust collector can be turned on to run.

1) Close the knife switch of the low-voltage main cabinet, check the three-phase power supply, and close the air switch of the power supply of each low-voltage cabinet; Start the dust collector cleaning cycle program; Confirm that each poppet valve is open.

2) Adjust the injection pressure, the setting point for starting the injection, the pulse frequency and the pulse width (after the first start-up setting, the next start-up will not be adjusted).

3) After starting the dust collector control system, the dust collector can be turned on (fan on).

4) Turn on the fan and confirm that the fan valve is closed before starting; After the fan is turned on, gradually open the damper until the required air volume is reached. (The current load of the fan cannot be exceeded).

5) After running for a period of time, adjust the dust collector cleaning cycle according to the cleaning situation (after this cycle is set, the next boot will not be adjusted) to keep the dust collector running in the best state.

6) The dust collector is based on the ash hopper ash storage capacity (less than half a bin).

Before installing the bag filter, check whether the accessories are complete, whether the host is damaged, whether the parts are firmly connected, etc., and whether there are problems that need to be solved before installation. The device should be placed on a flat and solid foundation. The device should be reliably grounded (flat).

The input end of described electromagnetic pulse valve is inserted into the metal pipe of air storage pipe, and its output end is inserted into the injection pipe of dust collector. The valve is equipped with rubber seals and fixing nuts at both ends, and the electromagnetic pulse valve can be reliably fixed and sealed.

The working principle of the electrical control system and the matters that should be paid attention to in the installation and commissioning are shown in the manual of the electrical control system.

Bag filter.

Technical requirements for dust removal bags:

The upper end of the dust removal bag is equipped with a bag cap and is suspended on the dust collector beam through a hanging device, and the lower end is reliably sealed and fixed with the lower bag;

The installation of the dust bag should adjust the tension to reach the specified value, so that the filter bag will not loosen and fall off when filtering and blowing, and adjust it again after the first week and the first month of use;

The fittings (anti-deflating rings) in the dust bag are properly matched, and all accessories should not have burrs or breaks.

Dust bag.