Advantages and disadvantages of high efficiency pulse dust collectors and air box pulse dust collect

One. The air box pulse cleaning method in the air box pulse dust collector is an American technology introduced by China in the eighties, and its characteristic is that each air chamber only uses one or two pulse valves to clean the filter bags in the air chamber. During ash cleaning, the air chamber needs to be isolated (offline), and then the high-pressure compressed air is sprayed into the upper air box of the pattern plate through the pulse valve, and the filter bag installed under the pattern plate is cleaned after the expansion of the box.

Pros: Only 1 2 pulse valves are required per air chamber.

There is no need to install a blowpipe and venturi, and the structure is simple.

Disadvantages: Only off-line cleaning, due to the closure of the ash cleaning gas chamber, the inlet flue gas needs to be directed to other filter gas chambers, so the dust removal filtration area and equipment volume are increased.

The blowing pipe opening cannot be used to adjust the injection force and air volume of each row of filter bags, so it may cause uneven cleaning in the air chamber and lead to local filter bag damage.

The dust collector needs to be divided into multiple sealing chambers, and the ram and poppet valve are installed to increase the cost of the equipment.

Most of the compressed gas cleaning energy is wasted by injecting directly into the inner wall of the upper air box.

Domestic air box pulse dust collectors generally only have a fixed number of filter bags per chamber, filter bag diameter and length. The length is generally fixed meters, otherwise the ash cleaning effect is not good, so the air box pulse dust collector will be limited by the site and cannot be flexibly designed.

Two. High-efficiency pulse dust collector (also known as line injection pulse) is currently the most common and efficient filter bag dust collector in the world. The special feature is to install a blowing pipe at the outlet of each pulse valve, which is responsible for aligning the filter bag installed under the injection hole for efficient pulse cleaning.

The structure is simple, and the filter bags and pulse valves of different sizes can be selected flexibly, and the distribution of the filter bags can be flexibly designed, and various units with air volume can be manufactured.

The working life of the pulse valve is generally more than 5 years, and the filter bag is more than 2 years.

The operating cost is low, and the compressed gas energy injection drainage is used to ensure the ash cleaning pressure at the bottom of the filter bag.

It has a large number of successful application examples in China.

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It's all about the same, the basic principle is the same, the high-efficiency pulse dust collector can do a little bigger.

Generally speaking, the dust removal efficiency of a pulse baghouse depends on the filter media you choose and the characteristics of the dust you want to treat.

When the dust attached to the dust filter bag reaches about 2 3g m2, the dust removal efficiency of the pulse bag filter can exceed 90%; When it reaches 150g m2, it can exceed 99% (according to the common dust concentration, the former takes about 1min, and the latter takes about 1h).

After the dust removal filter bag is cleaned, there is still some dust left, and after a period of periodic filtration and cleaning, the residual dust tends to be stable. At this time, the dust collection rate will generally remain greater than 99%, and if used properly, its dust collection efficiency can be exceeded.

Pulse baghouse.

The dust removal efficiency is high, generally up to 99%, and it can capture fine dust particles with a particle size greater than microns, which meets strict environmental protection requirements.

The air box pulse dust collector is a pulse valve responsible for the cleaning of dozens of bags, and the pipe spray dust collector is a pulse valve responsible for the work of more than a dozen bags. The key point is that the pulse valve is responsible for the number of bags and the ash cleaning effect is also different.

Product principle and process flow.

Under the action of the ventilator, the dusty gas is sucked into the intake manifold, evenly distributed to each inlet chamber through each inlet branch, and then pours into the filter bag, a large amount of dust is trapped on the filter bag, and the air flow is purified through the filter bag. The purified airflow passes through the bag chamber along the smoke exhaust into the chimney and into the atmosphere.

With the thickening of the dust attached to the surface of the filter bag fabric, the resistance of the dust collector continues to rise, which requires regular cleaning to reduce the resistance to below the specified lower limit before the dust collector can operate normally. The whole ash cleaning process is mainly completed by the action of the high-pressure air storage bag, solenoid valve, blowing pipe and ash cleaning control mechanism. First of all, the control system automatically sequentially hits the solenoid valve, and the high-pressure air is blown back through the blowing pipe, so that the dust adhered to the filter bag is shaken and falls off into the ash hopper.

Then the solenoid valve is closed, the cleaning operation of the system is over, and the filter bag is restored to the filtering state. The control system then opens other solenoid valves, and cleans the ash of other filter bags, and all the filter bags are cleaned after the ash cleaning cycle, so as to achieve the purpose of ash cleaning, the dust collector fully recovers the filtration state, and the ash in the ash hopper is discharged to the conveyor by the pneumatic ash discharge valve at the bottom.

The working principle of the air box pulse bag filter is that its body is divided into several box areas, each box has 32 or 32 multiple filter bags, and there is a cylinder-driven poppet valve on the outlet pipe on the side of each box. When the dust-containing gas is filtered for a certain period of time (or the resistance reaches the preset value), the ash cleaning controller will send a signal, and the poppet valve of the first chamber will begin to close the cutting section of the filtered air flow, and the pulse valve will be opened, and the compressed air greater than 0 4MPa will be rushed into the clean air chamber to remove the dust on the filter bag; After that, the poppet valve is reopened, so that the chamber is back in working condition.

The characteristics of this type of dust collector are: it combines the characteristics of dust collectors such as chamber backflushing and pulse jetting, and the adaptability is enhanced; It can not only deal with general concentration of dusty gas, but also can handle high concentration of dusty gas; It can be used as crusher, dryer, coal mill, raw meal mill, grate cooler, cement mill, packaging machine and dust collection equipment on the top of each warehouse, and can also be used as dust removal equipment in other industries.

This type mainly includes FPPF32 air box pulse dust collector.

What happened to Assad van der Sar has been a long, long time.

The air box pulse bag filter is a high-efficiency bag filter with the advanced level of the nineties. It combines the advantages of various bag dust collectors of chamber backblowing and jet pulse cleaning, and overcomes the difficulty of chamber backblowing and ash cleaning.

Enough, the shortcomings of spray pulse cleaning and filtration at the same time, thus expanding the application range of this dust collector, because this type of dust collector structure is particularly characteristic, so it improves the dust collection efficiency and prolongs the service life of the filter bag.

The quality of the dust removal effect of the air box pulse bag filter is related to a variety of factors, but it mainly depends on the filter material. The filter material of the bag filter is a cloth or felt woven from synthetic fibers, natural fibers or glass fibers. Put the cloth again as needed.

or felt-sewn into a cylinder or flat filter bag. According to the nature of the flue gas, the filter media suitable for the application conditions is selected. In general, polyester is often used when the flue gas temperature is below 120 and the filter material is required to have acid resistance and durability.

flannel and polyester needle felt; When dealing with high-temperature flue gas (<250), graphitized glass cloth is mainly used; In some special cases, carbon fiber filter media is selected.

The difference between the air box pulse bag filter and the jet bag filter:

The characteristics of the spray bag filter are that in the same dust collection room, each row of filter bags takes turns to blow and clean the ash, and the dust collection and filtration are still carried out during the ash cleaning, that is, the so-called ** ash cleaning. Some of the dust blown off by this cleaning method is re-captured by the adjacent filter bags.

This phenomenon is more serious if it is used to capture gases with large dust concentrations, so the application of the spray bag dust collector is limited to a certain extent.

The characteristic of the air box ash cleaning hole branch bag dust collector is to use the chamber to take turns to clean the ash, that is, the so-called offline cleaning. When a certain chamber is sprayed and cleaned, the filter airflow is cut off, which avoids the secondary flying of dust caused by spray cleaning. Therefore, the air box bag collector can capture gases with a water content and dust concentration of up to 1000g m3.

Pulse air box bag filter features:

1. The design is novel, the air intake structure is adopted, and the coarser high-temperature particles fall directly into the ash hopper, which effectively protects the filter bag.

2. The use of long filter bag, the equipment occupies less space at the same processing capacity, which is more convenient for the transformation of the old factory.

3. The air box pulse bag dust collector adopts the chamber separation line for ash cleaning, which has high efficiency, less secondary adsorption of dust, and effectively reduces the energy consumption of the equipment, and the fatigue degree of the filter bag and the pulse valve is also reduced accordingly, which doubles the life of the filter bag and valve plate, and greatly reduces the cost of equipment operation and maintenance.

4. The overhaul and bag replacement can be carried out in separate rooms under the condition of non-stop system fan and normal operation of the system.

5. The mouth of the filter bag adopts a spring tension structure, which is easy to disassemble and assemble, and has good sealing.

6. The box body is designed with gas lift and tremor to search for tightness, and kerosene is used to detect leakage to minimize air leakage.

7. The whole air box pulse bag filter equipment is composed of.

PLC machine control, to achieve automatic ash cleaning, ash unloading, automatic temperature control and over-temperature curtain reporting.

The air box pulse dust collector is a kind of block that belongs to the off-line storage. No attempt was made to perform blowback cleaning with only one or two pulse valves. But what about the spray bag filter.

Summing up the air box pulse dust collector and. The biggest difference between ordinary injection pulse bag filters is the difference in the number of pulse valves and the difference in the working principle of ash cleaning.

Air box pulse dust collector and jet bag filter are both pulse bag filters.

They differ in that their box pulse bag collector is used when each compartment is used. A blow baghouse with 1 to 2 pulse valves for feedback cleaning is one with more than two valves per box. Line by line, the finch was told to remove the dust cloth bag, and the line was disturbed, and Li Ming fed back the ash.