CN102698546B - Pulse reverse blowing ash removal device of ceramic filter - Google Patents

Abstract

The invention relates to a pulse blowback soot cleaning device for a ceramic filter. The filter tube plate is provided with a filter unit and a gas collection chamber; the upper part of the filter tube plate is a clean gas chamber, and the lower part is a dust-containing gas chamber; The back blowing dust removal device includes a back blowing gas storage tank. The back blowing gas storage tank is provided with a back blowing pipeline that is sealed and connected to the top of the air collection chamber of the filter unit. The back blowing pipeline is equipped with a pulse back blowing valve. The blowback pipeline between the top of the chamber and the pulse blowback valve is connected with a clean gas lead-out pipeline, and the outlet end of the clean gas lead-out pipeline is located in the clean gas chamber; the clean gas lead-out pipeline is equipped with a dust concentration monitor, a gas outlet Control valve and flow meter; a differential pressure sensor is connected between the dusty gas chamber and the top outlet of the filter unit air collection chamber. The pulse back-blowing and dust-cleaning device of the present invention can realize the cycle regeneration of the ceramic filter tube by adopting a relatively low back-flush pressure, and reduce the possibility of ceramic filter tube fracture and failure.

Description

Pulse back-blowing dust cleaning device for ceramic filter

technical field

The invention relates to a gas-solid separation device, in particular to a low-pressure pulse back-blowing dust-cleaning device for a ceramic filter. the

Background technique

High-temperature gas dedusting is a technology that directly separates gas from solid under high-temperature conditions to achieve gas purification. It can maximize the use of physical sensible heat, chemical latent heat and kinetic energy of the gas to improve energy utilization, while simplifying the process and saving equipment investment. the

Among the clean coal technologies with the most development potential at present, various coal-fired power generation technologies represented by integrated gasification combined cycle (IGCC) and pressurized fluidized bed combined cycle power generation (PFBC-CC) and coal gasification as the leading Coal chemical polygeneration technology involves the problem of dust removal of high temperature gas. A common problem encountered by IGCC and other clean coal power generation technologies in the process of commercialization is high-temperature gas purification. The purpose is to protect the gas turbine blades and downstream equipment, and to make the exhausted flue gas meet environmental protection standards. Ceramic filter is recognized as the most promising high-temperature gas-solid separation technology, which can remove particles larger than 5μm, the dust concentration at the outlet is less than 1mg/Nm ³ , and the separation efficiency reaches 99.99%.

The filter elements of the high-temperature filter are mainly arranged in a single layer. Taking the ceramic filter as an example, the tube plate of the filter divides the filter into upper and lower parts. The upper part is the clean gas side, and the lower part is the dusty gas side. The filter has only one layer of tube sheet, and multiple ceramic filter elements (ceramic filter tubes) are suspended on the tube sheet. The plurality of ceramic filter elements (ceramic filter tubes) are arranged in multiple groups, and each group shares an ejector. the

The pulse blowback cleaning device is an important guarantee for the stable operation of the ceramic filter. The pulse blowback device of the ceramic filter of existing industrial application is as shown in Figure 3A, and the pulse blowback device mainly is made up of blowback gas storage tank 91, pulse blowback valve 92, blowback pipeline and nozzle 921, and described blowback pipe The nozzle 921 of the road is kept at a certain distance from the ejector 93 of the ceramic filter (ie: the blowback pipeline is not directly connected with the ejector). The filter tube plate 94 divides the inner space of the ceramic filter into a clean gas side and a dusty gas side. A filter unit is composed of a plurality of ceramic filter tubes 95. Usually, a filter unit is equipped with 48 filter tubes, as shown in Figure 3B As shown, on the circular filter unit tube plate, the ceramic filter tubes are arranged in an equi-triangular manner. At least one filter unit (12 or 24 filter units are usually installed) is installed on the tube sheet 94 of the filter. The dust-laden gas or crude syngas enters the dust-laden side of the filter from the gas inlet 96 of the filter and reaches the surface of the ceramic filter tube 95 . The filtration and dust removal process is carried out on the outer surface of the ceramic filter tube 95. As the filtration progresses, the filter cake layer thickens and the pressure drop of the filter increases. When the pressure drop increases to a certain extent, according to the preset time interval, Use high-pressure nitrogen or synthetic gas to perform pulse backflush on filter elements (ceramic filter tubes) 95 groups to realize the performance regeneration of filter tubes. That is, after the first group of filter units are backflushed, after a certain time interval, the second group is backflushed, and after a certain time interval, the third group is backflushed until all the filter units are backflushed. The high-pressure blowback gas passes through the inner wall of the filter tube, and uses the transient energy to blow off the dust layer on the outer wall of the filter tube, and the dust falls into the ash hopper 98 . The filtered gas enters the common gas chamber formed by the ejector 93, then enters the clean gas side, and is discharged through the gas outlet 97 to enter the subsequent process. the

The typical working parameters of the above process are: filter operating temperature is 340°C, operating pressure is about 4MPa, high-pressure nitrogen or process synthesis gas is used as the backflush gas during pulse cleaning, the backflush pressure is about 8MPa, and the backflush temperature is greater than 225 ℃. The high-temperature ceramic filters currently used often cause a sudden increase in the downstream concentration due to the breakage of the ceramic filter tube, forcing the device to stop. The design of the existing pulse blowback device and the high-voltage pulse cleaning operation are not conducive to the long-term stable operation of the filter, and there are the following main problems: 

(1) Pulse blowback pressure is too high: The backflush airflow needs to overcome the operating pressure of the filter, the flow resistance of the filtered airflow and the inertial force of the gas on the clean gas side, and the backflush airflow cannot fully act on the filter unit. Therefore, in order to ensure the dust removal effect, a dust removal pressure that is about 2 times greater than the operating pressure of the filter is required, and the backflush pressure is as high as 8MPa. The higher the value, the more intense the vibration of the ceramic filter tube. Due to the weak resistance to deformation of ceramic filter tubes, the phenomenon of fracture failure is very common in industrial applications. Studies have shown that this high-pressure cleaning operation is the most important cause of fatigue fracture failure of filter tubes. the

(2) Only the timing backflushing method can be used, and the backflushing parameters cannot be dynamically adjusted: due to the design of the filter structure, the pressure difference of each filter unit cannot be determined during operation, and it can only be based on operating experience and according to the preset The backflush cycle is used to start the backflush device regularly. In actual operation, the operating load of each filter unit is different, and the operating conditions also fluctuate from time to time, resulting in inconsistent pressure drop of each group of filter units. For different operating conditions and differences between filter units, it is impossible to adjust in time The cycle of back blowing and dust cleaning affects the efficient and stable operation of the entire system. the

(3) The failure of the broken filter tube seriously affects the follow-up process: even if a ceramic filter tube breaks, the crude synthesis gas on the dusty gas side will enter the clean gas side through the broken ceramic filter tube, and the air flow "short circuit" phenomenon occurs, making The dust concentration in the downstream gas increases sharply, forcing the entire device to shut down, which seriously affects the subsequent production process. the

(4) The "backflow" phenomenon affects the recycling performance of the ceramic filter tube: when the pulse backflush is close to the end, the velocity of the backflush gas gradually decreases. The gas near the outer wall of the tube will flow back from the outside of the tube through the tube wall to the inside of the tube, so that the solid particles that have been blown off from the outer wall of the filter tube will settle on the outer wall again, and even some small particles will be embedded in the filter tube. In the tube wall, it affects the filtration quality and efficiency of the next filtration cycle and reduces the service life of the filter tube. the

Therefore, relying on years of experience and practice in related industries, the inventor proposes a pulse back-blowing soot cleaning device for ceramic filters to overcome the defects of the prior art. the

Contents of the invention

The purpose of the present invention is to provide a pulse back-blowing soot cleaning device for ceramic filters, which can realize the cycle regeneration of ceramic filter tubes by using lower back-flush pressure, and reduce the possibility of ceramic filter tube breakage and failure; Pressure drop and air flow are monitored, which is convenient for dynamic adjustment of backflushing parameters, and is conducive to long-term stable operation of the filter. the

Another object of the present invention is to provide a pulse backflushing soot cleaning device for ceramic filters, which can operate independently for each filter unit and has a safety protection function; it will not affect subsequent processes. the

The object of the present invention is achieved in this way, a kind of pulse blowback soot cleaning device of ceramic filter, the tube plate of described ceramic filter is provided with filtering unit, and the upper part of filtering unit is provided with gas collecting chamber; Filter tube plate will The filter is sealed and separated into an upper clean gas chamber and a lower dust-laden gas chamber; the pulse backflush soot cleaning device includes a backflush gas storage tank, and the backflush gas storage tank is equipped with a gas collection unit for the filter unit. The blowback pipeline is sealed and connected to the top of the chamber. A pulse blowback valve is installed in the blowback pipeline. A clean gas lead-out pipeline is connected to the blowback pipeline between the top of the gas collection chamber and the pulse blowback valve. The clean gas leads to The outlet end of the pipeline is located in the clean gas chamber; the clean gas outlet pipeline is equipped with a dust concentration monitor, a gas outlet control valve and a flow meter; between the dust-containing gas chamber and the top outlet of the filter unit gas collection chamber A differential pressure sensor is connected; the pulse blowback valve, dust concentration monitor, gas outlet control valve, flow meter and differential pressure sensor are electrically connected with a control unit. the

In a preferred embodiment of the present invention, the tube plate of the ceramic filter is provided with multiple groups of filter units; the top of the air collection chamber of each group of filter units is respectively sealed and connected with a backflush pipeline; A differential pressure sensor is arranged between the top outlet of the air collection chamber of the filter unit and the dusty gas chamber. the

In a preferred embodiment of the present invention, each set of filter units includes at least one filter element. the

In a preferred embodiment of the present invention, the filter element is a ceramic filter tube. the

In a preferred embodiment of the present invention, the shape of the gas collection chamber is a circular frustum or a truncated prism. the

From the above, the pulse blowback soot cleaning device of the ceramic filter of the present invention, because the end of the backflush pipeline is directly airtightly connected with the top of the gas collection chamber (there is no nozzle at the end of the backflush pipeline, which reduces the flow of filtered gas after collection. resistance, increase the blowback air volume during the cleaning operation, and reduce the resistance of the blowback airflow at the same time), the air collection chamber and the blowback pipeline form a closed space, and the blowback airflow only needs to overcome the operating pressure of the filter. , the filtered air flow is in a stopped state in a very short time, and the resistance of the filtered air flow has almost no effect. At the same time, the backflush air flow will all enter the gas collection chamber, and enter the ceramic filter tube after being diffused in the gas collection chamber. During this period, the energy loss is very small. Therefore, lower blowback pressure can be used to realize the cyclic regeneration of the ceramic filter tube, which can achieve a good cleaning effect, and also reduces the possibility of ceramic filter tube fracture and failure; The pulse blowback valve, dust concentration monitor, gas outlet control valve, flow meter and differential pressure sensor electrically connected to the control unit can monitor the pressure drop and air flow of the filter unit, which is convenient for dynamic adjustment of blowback parameters. It is beneficial to the long-term stable operation of the filter. the

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Fig. 1: is the structural schematic diagram 1 of the pulse back-blowing soot cleaning device of the ceramic filter of the present invention. the

FIG. 2A is a schematic structural diagram 2 of a pulse backflushing soot cleaning device for a ceramic filter of the present invention. the

Fig. 2B: Schematic diagram 2 of the arrangement of filter elements in the pulse backflushing soot cleaning device of the ceramic filter of the present invention. the

Fig. 2C: Schematic diagram 2 of the arrangement of filter elements in the pulse backflushing soot cleaning device of the ceramic filter of the present invention. the

Fig. 3A: is a schematic structural diagram of a conventional ceramic filter. the

Fig. 3B: Schematic diagram of the arrangement of filter elements in a conventional ceramic filter. the

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings. the

As shown in Fig. 1, the present invention proposes a kind of pulse back-blowing soot cleaning device of ceramic filter, and the tube plate 5 of described ceramic filter is provided with filter unit 6, and the upper part of filter unit 6 is provided with gas collection chamber 7; The tube plate 5 seals and separates the filter into an upper clean gas chamber 81 and a lower dusty gas chamber 82, the clean gas chamber 81 is provided with a gas outlet 811, and the dusty gas chamber 82 is provided with Gas inlet 821; the pulse blowback soot removal device includes a blowback gas storage tank 1, and the backflush gas storage tank 1 is provided with a blowback pipeline 2 that is sealed and connected to the top of the gas collection chamber 7 of the filter unit. A pulse blowback valve 21 is provided in the blowing pipeline 2, and a clean gas lead-out pipeline 3 is connected to the blowback pipeline 2 between the top of the gas collection chamber 7 and the pulse blowback valve 21, and the outlet of the clean gas lead-out pipeline 3 The end is located in the clean gas chamber 81; the clean gas outlet pipeline 3 is provided with a dust concentration monitor 31, a gas outlet control valve 32 and a flow meter 33; A differential pressure sensor 4 is connected between the top outlet; the pulse blowback valve 21, the dust concentration monitor 31, the gas outlet control valve 32, the flow meter 33 and the differential pressure sensor 4 are connected with a control unit (not shown in the figure) electrical connection. the

From the above, the pulse blowback soot cleaning device of the ceramic filter of the present invention, because the end of the backflush pipeline is directly airtightly connected with the top of the gas collection chamber (there is no nozzle at the end of the backflush pipeline, which reduces the flow of filtered gas after collection. resistance, increase the blowback air volume during the cleaning operation, and reduce the resistance of the blowback airflow at the same time), the air collection chamber and the blowback pipeline form a closed space, and the blowback airflow only needs to overcome the operating pressure of the filter. , the filtered air flow stops in a very short period of time, and the resistance of the filtered air flow has almost no effect. At the same time, the backflush air flow will all enter the gas collection chamber, and then enter the ceramic filter tube after being diffused in the gas collection chamber. During this period, the energy loss is very small. Therefore, lower blowback pressure can be used to realize the cyclic regeneration of the ceramic filter tube, which can achieve a good cleaning effect, and also reduces the possibility of ceramic filter tube fracture and failure; The pulse blowback valve, dust concentration monitor, gas outlet control valve, flow meter and differential pressure sensor electrically connected to the control unit can monitor the pressure drop and air flow of the filter unit, which is convenient for dynamic adjustment of blowback parameters. It is beneficial to the long-term stable operation of the filter. the

Further, as shown in Fig. 1 and Fig. 2A, in this embodiment, multiple sets of filter units 6 may be provided on the tube plate 5 of the ceramic filter; the top of the gas collection chamber 7 of each set of filter units 6 is respectively It is sealed and connected with a back blowing pipeline 2, and each back blowing pipeline 2 is connected with a corresponding clean gas outlet pipeline 3, and each clean gas outlet pipeline 3 is provided with a dust concentration monitor 31, a gas outlet control valve 32 and A flow meter 33; a differential pressure sensor 4 is provided between the top outlet of the gas collection chamber 7 and the dusty gas chamber 82 of each group of filter units. Each group of filter units can be operated independently and has a safety protection function; when any filter unit 6 is damaged, the gas outlet control valve 32 in the corresponding clean gas outlet pipeline 3 can be closed, thus, the subsequent process will not be affected . the

In this embodiment, the dust concentration monitor can quickly respond to changes in particle concentration in real time, and is located on the gas outlet pipeline of each group of filter units. The gas outlet control valve adopts high temperature and high pressure resistant ball valves or other types of valves, and controls the opening and closing of the valves by electric, pneumatic or hydraulic means. The flowmeter is used to measure the gas volume of each group of filter units, and is located at any position of the gas outlet pipeline. The differential pressure sensor forms information feedback with the flow meter and concentration monitoring data, which facilitates the adjustment of the pulse backflush cleaning scheme according to the actual working conditions. the

In this embodiment, the pulse blowback valve 21 is a pneumatic valve or an electric valve; the pulse blowback valve is located above the outer space of the high temperature ceramic filter. the

As shown in Figure 1, a part of the clean gas outlet pipeline 3 is shared with the backflush pipeline 2, which can facilitate the layout of the pipeline and save space; the gas outlet pipeline first extends to the outside of the filter, and then returns to the cleanliness of the filter. In the gas chamber 81, it is convenient to install the dust concentration monitor 31, the gas outlet control valve 32 and the flow meter 33 outside the filter for operation. The part outside the filter has an insulation layer to reduce heat loss. the

In the present embodiment, at least one filter element 61 is included in each group of filter units 6, and multiple filter elements 61 are also installed. The filter element 61 is a ceramic filter tube. the

Further, because the present invention adopts the low-pressure back-blowing soot cleaning technology, when multiple ceramic filter tubes 61 are installed in each group of filter units 6, the arrangement form of the ceramic filter tubes 61 can be compared with that of the ceramic filter tubes in the existing ceramic filters. The arrangements are the same (as shown in FIG. 2B ), and rectangular arrangements (as shown in FIG. 2C ) or other arrangements of any shape can also be used. According to the arrangement of the filter tubes, the shape of the gas collection chamber 7 can be changed flexibly. In this embodiment, the shape of the gas collection chamber 7 can be a circular truncated shape, or other shapes such as a truncated prism. the

The pulse back-blowing soot cleaning device of the ceramic filter of the present invention will be further described below. the

As shown in Figure 1, under the operating conditions of the high-temperature filter at an operating temperature of 340 °C and an operating pressure of about 4 MPa, the crude synthesis gas enters the filter from the gas inlet 821, passes through the gas distributor and the riser, and enters the filter. 5. Divide the filter into two parts, the dusty gas chamber 82 under the tube plate, and the clean gas chamber 81 on the tube plate. As shown by the hollow arrows in Figure 1, the dust-laden airflow reaches the ceramic filter tubes 61 in each filter unit 6, and the dust is intercepted on the surface of the ceramic filter tubes 61 to form a filter cake layer, and the filtered airflow is clean syngas. After passing through the ceramic filter tube 61, it is collected into the gas collection chamber 7 of each group of filter units 6, and then leads from the inside of the filter to the outside of the filter along the clean gas outlet pipeline 3, and then returns to the clean gas chamber 81 of the filter , is discharged through the gas outlet 811 and enters the subsequent process unit. the

Each group of filter units 6 can be operated independently; dust concentration monitor 31 and flow meter 33 are installed on the clean gas outlet pipeline 3 to monitor the concentration change trend of clean gas and the flow load of each filter unit in real time, and the gas outlet control valve 32 Keep normally open during the filtration process. the

Along with the carrying out of filtering operation, ceramic filter tube 61 filter cake layer is thickened constantly, and the pressure drop of each filter unit 6 that differential pressure sensor 4 measures increases, because the performance difference of ceramic filter tube 61 of each group of filter unit 6, coarse simultaneously The difference in gas flow distribution of the syngas in each group of filter units 6 leads to inconsistent pressure drop changes of each group of filter units 6 . The constant pressure difference cleaning method is adopted, that is, when each group of filter units 6 reaches the pressure drop value required for cleaning, the back blowing cleaning is performed (the actual operation of the existing device, due to the structural design of the back blowing device, can only be filtered for each group) The unit adopts timing back-flushing, and the back-flushing parameters of all filter units are set to a uniform value, and the operation flexibility is poor). When blowing back soot, the differential pressure sensor 4 triggers the action mode of the pulse blowback valve 21 and the gas outlet control valve 32: the gas outlet control valve 32 is closed, and the pulse blowback valve 21 is opened instantly (according to actual requirements, the duration is 200 ~ 1000ms ), high-pressure nitrogen or clean synthesis gas with a pressure of about 4.2-4.5MPa in the backflush gas storage tank 1 (the backflush pressure of the existing device is about 8MPa), enters the gas collection chamber 7 along the backflush pipeline 2, and After the pressurization in the chamber 7 enters the ceramic filter tube 61, the transient energy of the blowback airflow causes the filter cake layer adhered to the outer wall of the ceramic filter tube 61 to peel off and fall into the ash hopper. After the backflush is completed, the gas outlet control valve 32 is opened. Through the cooperation of the action modes of the two valves, it is possible to prevent the blowback air flow from the gas outlet pipeline 3 from entering the clean gas chamber during the blowback process, resulting in a reduction in the blowback effect and avoiding the occurrence of backflow, which is conducive to the stable operation of the filter . the

When the ceramic filter tube 61 of one or several filter units 6 breaks, the differential pressure sensor 4, the flow meter 33 and the dust concentration monitor 31 will feed back the information to the control unit: the pressure drop value of the filter unit 6 becomes smaller, each group of filter The unit flow rate increases and the outlet concentration increases suddenly. After the control unit makes a logical judgment, it closes the pulse blowback valve 21 and the gas outlet control valve 32, so that the filter unit 6 stops working, and the other filter units 6 operate normally without affecting subsequent operations. Production Process. the

Compared with the prior art, the pulse blowback cleaning device of the ceramic filter of the present invention has the following advantages:

(1) Lower cleaning pressure, higher cleaning intensity. the

During conventional high-pressure pulse blowback, the blowback airflow needs to overcome the operating pressure of the filter, the flow resistance of the filtered airflow and the inertial force of the gas on the clean gas side, so a cleaning pressure of about 8 MPa is required, while the blowback device of the present invention , Use about 4.2MPa-4.5MPa dust removal pressure to realize the performance regeneration of the ceramic filter tube, and the dust removal strength and uniformity are better. the

(2) Reduce the consumption of blowback gas and save costs. the

Due to the low backflush pressure, the consumption of backflush gas required for a single backflush is small. Industrial field devices use nitrogen or process synthesis gas as the backflush gas source, which has high production costs. Using this technology can significantly reduce the cost of backflush gas. the

(3) Reduce the possibility of fracture and failure of the ceramic filter tube. the

The research shows that the blowback pressure has the greatest influence on the vibration and thermal shock of the ceramic filter tube, which is the main reason for its premature fracture and failure. Therefore, under the premise of not affecting the cleaning effect, after the backflush pressure is greatly reduced, the impact of the backflush gas on the thermal shock and vibration of the ceramic filter tube is also reduced, prolonging the service life of the ceramic filter tube. the

(4) Safety protection measures do not affect subsequent processes. the

Once the ceramic filter tube breaks, the concentration monitoring device, flow meter and differential pressure sensor on the gas outlet pipeline will detect the abnormal phenomenon in time, and the control unit will close the valve on the gas outlet pipeline of the group of filter units after receiving the information feedback , to prevent the downstream concentration from being too high and causing the device to shut down. High-temperature ceramic filters used in industry generally include dozens of filter units, and closing one or several groups has little impact on the operation of the entire system. the

(5) The cleaning operation can be realized under the optimal backflushing operation parameters. the

Utilize the monitoring of the differential pressure sensor and flowmeter on each group of filter units, adjust the backflush parameters (backflush pressure and backflush cycle, etc.) of each group of filter units to achieve efficient dust removal under different operating conditions. It avoids the problem that the dust cleaning frequency is too high under low load operating conditions, but the dust cleaning frequency is too low under extreme load operating conditions. the

(6) The adverse effect of the backflow phenomenon is avoided. the

(7) The present invention can be directly applied to existing high-temperature ceramic filters, and is convenient for modification. the

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concepts and principles of the present invention shall fall within the protection scope of the present invention. the

Claims (5)

1. A pulse back-blowing soot cleaning device of a ceramic filter, the tube plate of the ceramic filter is provided with a filter unit, and the top of the filter unit is provided with a gas collection chamber; the filter tube plate separates the filter seal into an upper part The clean gas chamber and the dusty gas chamber at the lower part; it is characterized in that: the pulse backflush dust removal device includes a backflush gas storage tank, and the backflush gas storage tank is provided with a seal with the top of the gas collection chamber of the filter unit The connected blowback pipeline, the pulse blowback valve is set in the blowback pipeline, and the clean gas lead-out pipeline is connected on the blowback pipeline between the top of the gas collection chamber and the pulse blowback valve, and the clean gas lead-out pipeline The outlet end is located in the clean gas chamber; the clean gas outlet pipeline is equipped with a dust concentration monitor, a gas outlet control valve and a flow meter; pressure sensor; the pulse blowback valve, dust concentration monitor, gas outlet control valve, flow meter and differential pressure sensor are electrically connected to a control unit. 2. The pulse back-blowing soot cleaning device of ceramic filter as claimed in claim 1, is characterized in that: the tube plate of described ceramic filter is provided with multiple groups of filter units; the gas collection chamber of each group of filter units The tops are respectively sealed and connected with a blowback pipeline; a differential pressure sensor is set between the top outlet of the gas collection chamber and the dusty gas chamber of each group of filter units. 3. The pulse back-blowing soot cleaning device for ceramic filters according to claim 2, characterized in that: each set of filter units contains at least one filter element. 4. The pulse back-blowing soot cleaning device for a ceramic filter according to claim 3, characterized in that: the filter element is a ceramic filter tube. 5. The pulse back-blowing soot cleaning device for ceramic filters according to claim 1, characterized in that: the shape of the gas collection chamber is a circular frustum or a truncated edge.

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