捕鱼大作战

Analysis of Two Features of Pulse Bag Dust Collector-Novo Environmental Protection Equipment

诺和布袋除尘器
  • 布袋除尘器多种行业解决方案
  • 除尘布袋厂家直销

Analysis of the two major dust removal characteristics of pulse bag filter

Source: Novo environmental protection equipmentRelease time: 2016-1-16 15:12:58
脉冲布袋除尘器的两大除尘特点浅析
The pulse bag filter has two functions, one is filtering and the other is dust removal. For a long time, people have only judged the performance of the dust collector based on the macro parameters (such as filtering wind speed, equipment resistance, blowing pressure, dust cleaning cycle, pulse width, etc.). There is a large deviation, which makes the development, design, selection and use of the dust collector more blind. This article explores these two core functions.
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Abstract: The pulse bag filter has two functions, one is filtering, and the other is dust removal. For a long time, people have only judged the performance of the dust collector based on the macro parameters (such as filtering wind speed, equipment resistance, blowing pressure, dust cleaning cycle, pulse width, etc.). This method is often affected by many complex factors. There is a large deviation, which makes the development, design, selection and use of the dust collector more blind. This article explores these two core functions.


Bag dust removal is based on the filtering effect inherent in the filter bag itself and the dust layer attached to the surface of the filter bag to trap dust with certain particles in the flue gas. The clean flue gas filtered through the filter bag and dust layer is discharged through the exhaust port, and the ash on the surface of the filter bag can be removed by different ash cleaning methods. As we all know, the pulse spray bag dust collector mainly uses compressed air in the pressure air bag as the dust removal power, so that when the pulse valve starts, a pulse air flow is formed, and the pulse shakes from the top of the filter bag to the bottom of the bag in the reverse direction. The purpose is to shake the sticky ash on the outside of the filter bag into the dust hopper of the dust collector through pulse shaking. The author believes that in-depth study of the two functions of the filter and dust removal of the pulse bag filter is very important to improve its performance and ensure its long-term and reliable operation. Here are some preliminary views on this.

布袋除塵器除尘现场
1 Filtering wind speed
For bag dust collectors , the selection of filtering wind speed plays a key role in ensuring the dust removal effect, determining the type and footprint of the dust collector, and even the total investment of the dust removal system . In recent years, in the bidding and design of some engineering projects, the owners and some designers have increasingly lower requirements for filtering wind speed. The reasons may be as follows:

(1) In the past, there are literatures or monographs that emphasized that the filtering wind speed cannot be achieved too high, so as to avoid increased resistance and increased operating costs;

(2) Some designers believe that a lower filtering wind speed can improve the dust removal efficiency, enhance the dust cleaning ability, and extend the dust cleaning cycle, thereby extending the service life of the filter bag;

(3) At present, some cloth bag dust collectors and filter material manufacturers generally recommend a range of 1.0 to 1.5m / min, and some designers and owners often lower the value to determine the filtering wind speed, which leads to the filtering wind speed The value is too low.

It should be said that the above reasons are not unreasonable, but if the filtering wind speed is easily reduced, even if the absolute value of the reduction is small, such as 0.1 to 0.25m / min, thereby increasing the filtering area by about 10%, the equipment investment will also increase Nearly 10%. The larger the volume of air to be processed, the more investment will inevitably be increased, and the floor space of the equipment will be increased accordingly. Obviously, this is not economical. There are many factors that affect the performance and long-term reliable operation of the bag dust removal system. It is also inappropriate to look at the above reasons in isolation. In fact, the correct selection of filtering wind speed is a more complicated task, which is closely related to the properties of dust, the initial dust concentration of the flue gas, the type of filter material, and the cleaning method.


At present, there are not many types of filter materials and cleaning methods available on the market. Filter materials and cleaning methods are relatively easy to determine. As for the initial dust concentration of the flue gas, in addition to the information provided by the process, it is measured or referenced. The same type of working conditions and furnace types are determined by experience. Therefore, the key to the correct selection of the filtering wind speed is to first understand the properties of the flue gas and dust, and secondly to correctly understand and understand the relationship between the filtering wind speed and the dust removal efficiency, filtration resistance, and dust removal performance. As for the properties of smoke and dust, it is necessary to clarify the particle size distribution of smoke, the chemical composition of dust, and the physical and chemical properties of dust, such as temperature, humidity, bulk density, viscosity, and corrosivity. Objectively speaking, it is difficult to collect this information comprehensively and accurately, but as a designer, you should have at least some understanding of it.


Some people have done experiments in China. For all kinds of fine and smooth dust in talc powder, under all operating conditions, only one blowback dust removal is needed, the filter bag resistance can be restored to its original value, and the secondary dust is almost completely blown off. The amount of back blowing only needs to be 25 to 30%. For iron oxide superfine dust, it is usually necessary to blow back the dust several times in succession to effectively reduce the resistance of the filter bag and it is difficult to restore the original value. %. This shows that for a certain bag filter , the dust removal performance of the dust mainly depends on the properties of the dust and the dust-containing gas, not all dust, and the filtering speed can be lowered to enhance the dust removal ability. Fourth, if the filter bag is determined, reducing the filtering wind speed can extend the dust cleaning cycle, but the service life of the filter bag does not completely depend on the dust cleaning cycle. Because when a certain filtering wind speed is determined, the filtering wind speed of different parts of the filter bag is also different. Experiments abroad have found that the difference in local filtering wind speed on a filter bag can reach 4 times or even more than 4 times. In summary, it can be concluded that blindly reducing the filtering wind speed does not completely guarantee the improvement of the dust removal efficiency, nor does it necessarily reduce the filtering resistance, and may cause unnecessary economic losses; only by fully understanding the nature of the dust and Based on the characteristics of the system, the structure design of the dust collector's body should be optimized, and the correct economic and technical analysis should be performed to determine the filtering wind speed reasonably.



It does not depend entirely on the cleaning cycle. Because when a certain filtering wind speed is determined, the filtering wind speed of different parts of the filter bag is also different. Experiments abroad have found that the difference in local filtering wind speed on a filter bag can reach 4 times or even more than 4 times. In summary, it can be concluded that blindly reducing the filtering wind speed does not completely guarantee the improvement of the dust removal efficiency, nor does it necessarily reduce the filtering resistance, and may cause unnecessary economic losses; only by fully understanding the nature of the dust and Based on the characteristics of the system, the structure design of the dust collector's body should be optimized, and the correct economic and technical analysis should be performed to determine the filtering wind speed reasonably.

2 Pulse cleaning problem
For the pulse bag filter , many people think that the impact of the compressed air pulse on the filter bag plays a major role in dust removal, and define the dust separation force Fs as the dust load per unit area of the filter bag and the filter bag expansion to The product of the maximum reverse acceleration Ap obtained at the extreme position, that is, Fs = md? Ap, indicates that only when the dust separation force Fs exceeds the adhesion force FA between the dust and the filter bag, dust peeling will occur. It can be seen that for a specific dust / filter material system of a specific pulse spray cleaning system, there should be a suitable range of reverse acceleration AF value to ensure that a satisfactory cleaning effect can be obtained, and the filter bag is cleaned. The maximum reverse acceleration AP obtained during the pulse injection process reflects the strength of the impact caused by the pressure pulse, which represents the dust cleaning ability of the dust cleaning system. The Environmental Protection Research Institute of the Ministry of Metallurgical Industry has conducted a ring-gap pulse injection system filter bag injection acceleration test. From the relevant tests, it can be analyzed that during the pulse injection process, the filter bag initially accelerates to expand outward; when the expansion reaches a certain level When the filter bag is stretched to generate a tension that hinders its expansion, the positive (radial outward) acceleration of the filter bag is reduced, but the filter bag is still accelerated outward; as the filter bag continues to expand, The tension increases sharply. When the synthetic tension is balanced with the static pressure of the blowing airflow, the acceleration becomes zero, and the speed of the filter bag running outwards reaches the maximum. Subsequently, the filter bag starts to accelerate in the opposite direction to slow down and expand; when the expansion reaches the limit At the position, its speed is zero, and the tension rises to the maximum. Under this great restoring force, the filter bag generates a strong shock vibration and obtains the maximum reverse acceleration Ap; then the filter bag starts to retract. After leaving the extreme position, the tension it receives will decrease sharply, and the spray airflow will prevent it from returning to the original rest position. In the subsequent pulse spraying process, the filter bag works near the extreme position. Weak vibration. When the filter bag expands outward, the static pressure of the blowing airflow is the exciting force, and when the filter bag is retracted, it becomes a damping force, and the static pressure of the airflow is constantly changing during the pulse blowing process. The restoring force of the filter bag vibration (that is, the synthetic tension) is another impulse. It can be seen that the movement of the filter bag during the entire pulse spraying process is a complex and damped forced vibration. During pulsed ash cleaning, the filter bag begins to expand in order from top to bottom and reaches the limit position in sequence. The inflated form of the filter bag can not be regarded as a pressure bubble swept through the filter bag from top to bottom, but when the bottom of the bag starts to expand, the entire filter bag is in a different expansion degree and is inverted. Round table. In China, pulse ash cleaning is divided into high pressure and low pressure cleaning according to the level of injection pressure. Foreign countries divide pulse ash cleaning into high pressure small air volume (HPLV), medium pressure medium air volume (IPIV) and low pressure high air volume ( LPHV) three. Domestically, there is such a view that the blowing pressure is low, and the force on the filter cloth is small during ash cleaning, which is conducive to prolonging the service life of the filter cloth, which means that low-pressure cleaning is better than high-pressure cleaning. Tests have proved that this view is actually not comprehensive enough. In the case of different injection volumes, it is impossible to compare the force of high-pressure and low-pressure ash cleaning on the filter cloth. From the 1990s, the above three pulse injection methods have been widely used in flue gas dust removal systems of coal-fired power plants in Europe, America and Australia. In 1988, the Electric Power Research Institute (EPRI) conducted an in-depth investigation and comparison of multiple pulsed bag dust collectors that were already operating in power plant boilers around the world. The conclusion is that the above three types of pulse bag dust collectors can achieve the expected operating results and smoke emission standards, and are suitable for popularization in the United States electric power system.

In order to compare the performance and dust removal efficiency of three types of pulse spray bag dust collectors under the same operating conditions, the EPRI conducted the dust cleaning test at the Scholz Power Plant in Florida using the above three pulse spray methods.

(1) During the three-month test, no damage or failure of the filter bag occurred;

(2) All three dust removal effects can meet the dust removal efficiency requirements of coal-fired boilers in power plants;

(3) It is not that the lower the cleaning pressure, the smaller the power consumption during operation.

It can be seen that HPLV with high efficiency cleaning has the characteristics of the lowest running cost and the lowest cleaning frequency. After a period of equipment operation, it can be concluded that the number of frictions between the filter bag of the dust collector and the bag cage is the least. Therefore, the high pressure and low air volume pulse bag filter will be able to extend the service life of the filter bag optimally. Of course, the blowing pressure must not be too high, and there must be a "degree" for everything. If the cleaning pressure is too strong, the filter bag may also crack due to severe friction with the bag cage. Therefore, no matter the high, medium or low pressure air source is used, the dust removal intensity and flow rate of the equipment must be reasonably configured in consideration of the process and site conditions and the nature of the filter material. In actual use, there is no strict demarcation between high, medium and low pressure, but only relatively speaking.

The dust removal pressure is not the only factor that determines the filter bag's dust removal force (that is, the reverse acceleration). The force of low pressure dust removal on the filter bag may not be less than that of high pressure dust removal. Basis for judging bag life. The large aperture and low injection pressure can also make the filter bag produce greater acceleration.

When the pressure difference between the inside and outside of the filter bag reaches the set value, the automatic control system sends a signal, the pulse valve is quickly opened, the compressed air is released instantly, and the pulse valve and the injection pipe are injected into the filter bag. Experiments have shown that the injection of the pulse valve A large air volume does not mean that the performance of the pulse valve is superior. Prolonging the injection time does not have any effect on the acceleration of the filter cloth during injection, which is not conducive to improving the dust removal effect. The response speed of the pulse valve is an important technical indicator. Due to the different response speeds of pulse valves produced by different manufacturers, the difference in the volume of injected air is also very large. The pulse valve with a slow response speed not only consumes more compressed air, but because of the slow rise of the reverse pressure inside the filter bag during injection, it will also affect the acceleration of the filter bag, that is, the dust removal effect.

Bag dust removal is a complex system project. There are many factors that need to be considered for a complete bag dust removal system. It is possible to carry out further research on the two basic functions of the bag dust collector . I think it is to grasp the essence of the bag dust collector . The author only talked about some preliminary views. If I can play a role in attracting peers, it will be my biggest wish._
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