Rigid filter

Abstract

The utility model provides a rigid filter which comprises a shell assembly, the shell assembly comprises a shell structure and a partition plate, and the partition plate is arranged in the shell structure; the filtering assembly is connected with the partition plate; the cleaning assembly comprises an air blowing structure, the air blowing structure is partially arranged between the shell structure and the partition plate and located on the side, away from the filtering assembly, of the partition plate, and the air blowing structure and the filtering assembly are correspondingly arranged. According to the technical scheme, the problem that in the prior art, in the process of cleaning the rigid filter pipe through pulse gas, the pipe wall of the filter pipe bears large thermal stress and is prone to breakage is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of exhaust gas treatment, and in particular to a rigid filter. Background Art

[0002] Rigid filters are widely used in the fields of petrochemicals, coal chemical industry and clean coal power generation to remove solid particles from high-temperature flue gas to ensure that the flue gas discharged into the atmosphere meets the emission standards and reduce environmental pollution.

[0003] A rigid ceramic filter tube or a metal filter tube is installed in the rigid filter. The filter tube is fixed to the tube plate by hanging at one end. As the filtering continues, a certain thickness of dust will adhere to the surface of the filter tube. High-pressure pulse gas is required for group circulation cleaning to achieve continuous filtering operation.

[0004] The rigid filter in the prior art has a large temperature difference between the inner and outer walls of the filter tube due to the high internal temperature and the low temperature of the high-pressure pulse gas. The filter tube wall is subjected to great thermal stress, and the heat energy required for additional heating of the high-pressure pulse gas is large, which reduces the economic benefits of the enterprise and consumes too much energy, such as CN102698546A. Utility Model Content

[0005] A technical problem to be solved by the present application is that during the process of cleaning a rigid filter tube using pulse gas, there is a problem that the filter tube wall is subjected to large thermal stress and is prone to breakage.

[0006] In order to solve the above technical problems, the present application provides a rigid filter.

[0007] A rigid filter provided according to the present application includes: a shell assembly, the shell assembly includes a shell structure and a partition, the partition is arranged in the shell structure; a filter assembly, the filter assembly is connected to the partition; a cleaning assembly, the cleaning assembly includes an air blowing structure, the air blowing structure is partially arranged between the shell structure and the partition and is located on the side of the partition away from the filter assembly, and the air blowing structure is arranged corresponding to the filter assembly.

[0008] In some embodiments, the blowing structure includes an air inlet pipeline, a preheating pipeline and an air outlet structure. The air inlet of the air inlet pipeline is connected to the air source, the air outlet of the air inlet pipeline is connected to the air inlet of the preheating pipeline, the preheating pipeline is arranged between the shell structure and the partition, the air outlet of the preheating pipeline is connected to the air outlet structure, and the air outlet structure is arranged corresponding to the filter component.

[0009] In some embodiments, the preheating line is a U-shaped line.

[0010] In some embodiments, the preheating line is a bellows.

[0011] In some embodiments, the filter assembly includes a plurality of filter structures, and the air outlet structure includes a plurality of filter structures that are arranged in a one-to-one correspondence with the plurality of filter structures.

[0012] In some embodiments, the filter structure includes multiple filter tubes, multiple filter tubes are connected to the partition, multiple filter tubes are connected to the space where the air outlet structure is located, the air outlet structure includes multiple air outlet parts, and the multiple air outlet parts are arranged one-to-one corresponding to the multiple filter tubes.

[0013] In some embodiments, the axis of the air outlet portion coincides with the axis of the corresponding filter tube.

[0014] In some embodiments, a pulse blowback valve is provided on the air intake line.

[0015] In some embodiments, the housing structure includes an inlet and an outlet, wherein the inlet is located on a side of the partition close to the filter assembly, and the outlet is located on a side of the partition close to the cleaning assembly.

[0016] In some embodiments, the shell structure includes a discharge section, which is located on a side of the shell structure away from the cleaning component. The vertical height of the discharge section is lower than the vertical height of the inlet, and the horizontal cross-sectional area of ​​the discharge section continuously decreases in the direction from close to to away from the partition.

[0017] Through the above technical scheme, the rigid filter provided by the present application, the high-temperature flue gas enters the shell structure from the bottom of the shell assembly, most of the dust in the flue gas is filtered by the filter assembly, and the filtered flue gas flows into the top of the partition and flows out. When there is too much dust accumulated on the filter assembly, the cleaning assembly is started, and the high-pressure pulse gas enters the blowing structure. Since the blowing structure is partially arranged in the shell structure, the high-pressure pulse gas is preheated by the high temperature in the shell structure, and the temperature difference between the high-pressure pulse gas and the high-temperature flue gas is reduced, and the thermal stress on the filter assembly is small. The high-pressure pulse gas is sprayed from the blowing structure to the filter assembly, and the dust on the surface of the filter assembly is separated from the surface of the filter assembly under the impact of the gas. The technical scheme of the present application effectively solves the problem in the prior art that in the process of using pulse gas to clean the rigid filter tube, the filter tube wall is subjected to large thermal stress and is easy to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1A schematic diagram of the front view structure of the rigid filter disclosed in the first embodiment of the present application is shown;

[0020] Figure 2 Shows Figure 1 A schematic diagram of a top view cross-sectional structure of a rigid filter;

[0021] Figure 3 A schematic cross-sectional structure diagram of the preheating pipeline of the rigid filter disclosed in the second embodiment of the present application is shown.

[0022] Description of reference numerals:

[0023] 10. Shell assembly; 11. Shell structure; 111. Inlet; 112. Outlet; 113. Discharge section; 12. Partition; 20. Filter assembly; 21. Filter structure; 211. Filter tube; 30. Cleaning assembly; 31. Air blowing structure; 311. Air inlet pipeline; 312. Preheating pipeline; 313. Air outlet structure; 3131. Air outlet section. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments of the present application, but includes all technical solutions that fall within the scope of the claims.

[0025] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0026] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0028] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0029] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0031] like Figure 1 to Figure 2 As shown, the rigid filter disclosed in the first embodiment of the present application includes a shell assembly 10, a filter assembly 20 and a cleaning assembly 30. The shell assembly 10 includes a shell structure 11 and a partition 12. The partition 12 is arranged in the shell structure 11. The filter assembly 20 is connected to the partition 12. The cleaning assembly 30 includes a blowing structure 31. The blowing structure 31 is partially arranged between the shell structure 11 and the partition 12 and is located on the side of the partition 12 away from the filter assembly 20. The blowing structure 31 is arranged corresponding to the filter assembly 20.

[0032] According to the technical solution of the first embodiment, the high-temperature flue gas is passed from the bottom of the shell assembly 10 into the shell structure 11, and most of the dust in the flue gas is filtered by the filter assembly 20. The filtered flue gas flows into the top of the partition 12 and flows out. When there is too much dust accumulated on the filter assembly 20, the cleaning assembly 30 is started, and the high-pressure pulse gas enters the blowing structure 31. Since the blowing structure 31 is partially arranged in the shell structure 11, the high-pressure pulse gas is preheated by the high temperature in the shell structure 11, and the temperature difference between the high-pressure pulse gas and the high-temperature flue gas is reduced. The thermal stress on the filter assembly 20 is small, and the high-pressure pulse gas is sprayed from the blowing structure 31 to the filter assembly 20. The dust on the surface of the filter assembly 20 is separated from the surface of the filter assembly 20 under the impact of the gas. The technical solution of the first embodiment effectively solves the problem in the prior art that the filter tube wall is subjected to large thermal stress and is easy to break during the cleaning process of the rigid filter tube using pulse gas.

[0033] like Figure 1 As shown, in the technical solution of the first embodiment, the blowing structure 31 includes an air inlet pipeline 311, a preheating pipeline 312 and an air outlet structure 313. The air inlet of the air inlet pipeline 311 is connected to the air source, the air outlet of the air inlet pipeline 311 is connected to the air inlet of the preheating pipeline 312, the preheating pipeline 312 is arranged between the shell structure 11 and the partition 12, the air outlet of the preheating pipeline 312 is connected to the air outlet structure 313, and the air outlet structure 313 is arranged corresponding to the filter assembly 20. The air source provides clean gas, the gas is introduced from the air inlet pipeline 311, and enters the preheating pipeline 312 for preheating, and the preheated gas is ejected from the air outlet structure 313 to impact the cleaning assembly 30, thereby cleaning the dust attached to the surface of the cleaning assembly 30. Since the preheating pipeline 312 and the cleaning assembly 30 are both arranged in the shell structure 11, the gas in the preheating pipeline 312 and the cleaning assembly 30 are both affected by the high-temperature flue gas, and the temperature difference between the preheated clean gas and the cleaning assembly 30 is reduced, thereby reducing the thermal stress on the cleaning assembly 30. The length of the preheating pipeline 312 is reasonably set, so that the clean gas can meet the use requirements after flowing out of the preheating pipeline 312, and the temperature of the clean gas is usually not lower than 70% of the internal temperature of the shell structure 11.

[0034] like Figure 1 As shown, in the technical solution of the first embodiment, the preheating pipeline 312 is a U-shaped pipeline. The preheating pipeline 312 is set to be U-shaped, and the length of the preheating pipeline 312 is increased as much as possible within a limited space, thereby reducing the space occupied by the preheating pipeline 312, and further reducing the occupied space of the entire rigid filter.

[0035] like Figure 1 and Figure 2As shown, in the technical solution of the first embodiment, the filter assembly 20 includes a plurality of filter structures 21, and the air outlet structure 313 includes a plurality of filter structures 21 arranged one by one in correspondence with the plurality of filter structures 21. Each air outlet structure 313 can blow air to the corresponding filter structure 21 to clean the corresponding filter structure 21. This can realize the individual control of the cleaning of each group of filter structures 21, and the cleaning is more thorough.

[0036] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the filter structure 21 includes a plurality of filter tubes 211, the plurality of filter tubes 211 are connected to the partition 12, the plurality of filter tubes 211 are connected to the space where the gas outlet structure 313 is located, and the gas outlet structure 313 includes a plurality of gas outlets 3131, and the plurality of gas outlets 3131 are arranged one-to-one with the plurality of filter tubes 211. The plurality of filter tubes 211 are arranged at intervals, and the partition 12 is provided with through holes arranged one-to-one with the filter tubes 211, and the filter tubes 211 are connected with the through holes, so as to be connected with the space above the partition 12. There is a predetermined height difference between the gas outlet 3131 and the through hole, and the filtered gas enters the space above the partition 12 from the gap between the through hole and the gas outlet 3131. The plurality of gas outlets 3131 clean each filter tube 211 in half to ensure that each filter tube 211 has a good filtering effect.

[0037] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the axis of the air outlet 3131 coincides with the axis of the corresponding filter tube 211. The air outlet 3131 sprays air along the axis of the filter tube 211, so that the side wall of the filter tube 211 is subjected to the same gas impact, the cleaning effect of the filter tube 211 is better, and it is not easy to have a cleaning dead angle.

[0038] like Figure 1 As shown, in the technical solution of the first embodiment, a pulse back-blowing valve is provided on the air intake pipe 311. The pulse back-blowing valve is an electromagnetically controlled valve, which controls the opening and closing of the valve by changing the magnetic field distribution through the opening and closing of the control circuit. The periodic control circuit can realize the periodic opening and closing of the valve, thereby generating pulse gas to clean the filter tube 211. The high-pressure pulse gas can cause the filter tube 211 to vibrate slightly by repeatedly impacting the filter tube 211, and the cleaning effect is better than continuous blowing.

[0039] like Figure 1As shown, in the technical solution of the first embodiment, the shell structure 11 includes an inlet 111 and an outlet 112. The inlet 111 is located on the side of the partition 12 close to the filter assembly 20, and the outlet 112 is located on the side of the partition 12 close to the cleaning assembly 30. The high-temperature flue gas enters the shell structure 11 from the inlet 111, flows through the filter tube 211, and the particulate matter in the flue gas adheres to the filter tube 211. Since the flue gas temperature is high, the flue gas moves upward, and the filtered flue gas flows from the through hole on the partition 12 to the top of the partition 12, so that the preheating pipeline 312 maintains a high temperature while being discharged from the outlet 112 arranged above. The inlet 111 and the outlet 112 are respectively arranged on both sides of the partition 12, which ensures that the gas is fully filtered in the shell structure 11, and the position of the inlet 111 and the outlet 112 are reasonably selected by utilizing the upward flow characteristics of the high-temperature gas, without the need to set a guide structure, which further simplifies the structure of the entire rigid filter.

[0040] like Figure 1 As shown, in the technical solution of the first embodiment, the shell structure 11 includes a discharge section 113, which is located on the side of the shell structure 11 away from the cleaning assembly 30. The height of the discharge section 113 in the vertical direction is lower than the height of the inlet 111 in the vertical direction. The cross-sectional area of ​​the horizontal plane of the discharge section 113 decreases continuously in the direction from close to far away from the partition 12. The particles falling off the filter tube 211 fall into the discharge section 113. A door is provided at the bottom of the discharge section 113. When the door is opened, the particles are discharged from the bottom of the discharge section 113. The structure of the discharge section 113 in which the cross-sectional area of ​​the horizontal plane decreases continuously in the direction from close to far away from the partition 12 makes the particles slide down along the side wall of the discharge section 113, which guides the movement of the particles. The height of the outlet 112 in the vertical direction is higher than the height of the discharge section 113 in the vertical direction, which prevents the particles from accumulating at the inlet 111 and affecting the flue gas.

[0041] like Figure 3 As shown, the difference between the technical solution of the second embodiment and the technical solution of the first embodiment is that the preheating pipeline 312 is a bellows. The inner wall of the bellows is in a stacked state, which further increases the contact area between the gas and the inner wall of the preheating pipeline 312, thereby improving the preheating efficiency.

[0042] The difference between the technical solution of Example 3 and the technical solution of Example 1 is that the preheating pipeline 312 is a U-shaped corrugated tube, which increases the length of the preheating pipeline 312 in a limited space and improves the gas preheating efficiency, further reduces the temperature difference between the pulse gas and the high-temperature flue gas, reduces the thermal stress on the filter tube 211, and reduces the occurrence of breakage of the filter tube 211.

[0043] From the above, it can be seen that a preheating coil (preheating pipeline 312) is set in the pulse backwash system (cleaning component 30), and the preheating coil adopts an inverted U-shaped design. The length of the preheating coil is preferably such that the temperature reaching the backwash gas distributor is not lower than 70% of the operating temperature in the filter (shell structure 11); the preheating coil body of the inverted U-shaped design is a bellows structure, which can not only increase the convective heat transfer area, but also effectively enhance the turbulence in the tube, destroy the heat transfer boundary layer, and greatly increase the convective heat transfer coefficient; at the same time, by reasonably designing the matching relationship between the number of bellows layers, wave thickness, wave distance and pulse backwash parameters (backwash pressure and pulse width), the pulse airflow is disturbed, so that the single continuous pulse entering the backwash gas distributor is disassembled and superimposed into multiple intermittent pulses, so as to realize multiple cleaning in the filter tube and improve the cleaning efficiency. The filter tube sheet (partition 12) seals and separates the filter (shell structure 11) into two parts, the lower part is the dusty gas side, and the upper part is the clean gas side; the dusty gas enters the dusty gas side of the filter from the gas inlet (inlet 111) of the filter, and reaches each filter unit (filter structure 21) under the action of the gas driving force, and the solid particles in the air flow are deposited on the outer surface of the filter tube 211 to form a stable and dense dust layer. The dusty gas enters the clean gas side after being filtered through the porous channel of the filter tube 211, and is discharged through the purified gas outlet 112 to enter the subsequent process. As the filtering process proceeds, the dust layer on the outer surface of the filter tube 211 gradually thickens, resulting in an increase in the pressure drop of the filter. At this time, a pulse backwash method is required to achieve performance regeneration of the filter tube. During pulse back-blowing cleaning, the gate valve in the normally open state remains open, and the pulse back-blowing valve in the normally closed state opens, and high-pressure gas enters from the back-blowing gas inlet through the back-blowing gas storage tank, enters the back-blowing pipeline distributor (gas outlet structure 313) through the connecting pipeline (gas inlet pipeline 311) and the preheating coil, and then sprays high-pressure and high-speed back-blowing gas toward the axial direction of the filter tube 211 through the nozzle (gas outlet 3131) on the back-blowing pipeline distributor, and the back-blowing gas enters the corresponding filter tube 211. Transient energy is used to overcome the adhesion between the dust layer and the outer surface of the filter tube 211, so as to peel off and remove the dust layer, so that the resistance of the filter tube 211 is basically restored to the initial state, and the pressure drop of the filter tube 211 drops sharply, basically restoring to the state of the initial filtration, thereby realizing the cyclic regeneration of the performance of the filter tube 211.A filter unit is equipped with multiple filter tubes 211, each fan-shaped filter unit shares a back-blowing gas distributor, each back-blowing pipeline distributor is provided with multiple nozzles, and a filter tube 211 corresponds to the bottom of each nozzle; in each filter unit, the filter tubes are arranged in an equilateral triangle, corresponding to the back-blowing gas distributor and the nozzle respectively; multiple filter units are usually installed on the tube sheet (partition 12) of the filter, and during pulse back-blowing, according to the set back-blowing time interval, the first group of pulse back-blowing valves are opened, and the pulse back-blowing gas enters the clean gas side The preheating coil in the backwash pipe and the downstream backwash pipe distributor are all connected by flanges. After the preheating coil with an inverted U-shaped design, the pulse backwash gas at normal temperature and high pressure is converted into high temperature and high pressure gas after convection heat exchange and enters the backwash pipe distributor. After the corresponding backwash pipe distributor backwashes the group of filter units, after a certain period of time, the pulse backwash valve of the second group is opened, and the corresponding backwash pipe distributor backwashes the second group of filter units. After a certain period of time, the pulse backwash valve of the third group is opened to backwash the third group of filter units, and this cycle is repeated.

[0044] So far, the embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution of the present application.

[0045] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A rigid filter, characterized in that: include: A housing assembly (10), the housing assembly (10) comprising a housing structure (11) and a partition (12), the partition (12) being arranged in the housing structure (11); A filter assembly (20), wherein the filter assembly (20) is connected to the partition plate (12); A cleaning component (30), the cleaning component (30) comprising an air blowing structure (31), the air blowing structure (31) being partially arranged between the shell structure (11) and the partition (12) and being located on a side of the partition (12) away from the filter component (20), the air blowing structure (31) being arranged correspondingly to the filter component (20).

2. The rigid filter according to claim 1, characterized in that The air blowing structure (31) comprises an air inlet pipeline (311), a preheating pipeline (312) and an air outlet structure (313); the air inlet of the air inlet pipeline (311) is connected to an air source; the air outlet of the air inlet pipeline (311) is connected to the air inlet of the preheating pipeline (312); the preheating pipeline (312) is arranged between the shell structure (11) and the partition (12); the air outlet of the preheating pipeline (312) is connected to the air outlet structure (313); and the air outlet structure (313) is arranged corresponding to the filter assembly (20).

3. The rigid filter according to claim 2, characterized in that The preheating pipeline (312) is a U-shaped pipeline.

4. The rigid filter according to claim 3, characterized in that The preheating pipeline (312) is a corrugated pipe.

5. The rigid filter according to claim 2, characterized in that The filter assembly (20) comprises a plurality of filter structures (21), and the air outlet structure (313) comprises a plurality of filter structures (21) arranged in a one-to-one correspondence with the plurality of filter structures (21).

6. The rigid filter according to claim 5, characterized in that The filtering structure (21) comprises a plurality of filtering tubes (211), the plurality of filtering tubes (211) being connected to the partition (12), the plurality of filtering tubes (211) being connected to a space where the air outlet structure (313) is located, the air outlet structure (313) comprising a plurality of air outlet portions (3131), the plurality of air outlet portions (3131) being arranged in a one-to-one correspondence with the plurality of filtering tubes (211).

7. The rigid filter according to claim 6, characterized in that The axis of the air outlet portion (3131) coincides with the axis of the correspondingly arranged filter tube (211).

8. The rigid filter according to claim 2, characterized in that The air intake pipeline (311) is provided with a pulse blowback valve.

9. The rigid filter according to any one of claims 1 to 8, characterized in that The shell structure (11) comprises an inlet (111) and an outlet (112); the inlet (111) is located on a side of the partition (12) close to the filter assembly (20); and the outlet (112) is located on a side of the partition (12) close to the cleaning assembly (30).

10. The rigid filter according to claim 9, characterized in that The shell structure (11) comprises a discharge section (113), which is located on a side of the shell structure (11) away from the cleaning component (30), the height of the discharge section (113) in the vertical direction is lower than the height of the inlet (111) in the vertical direction, and the cross-sectional area of ​​the horizontal plane of the discharge section (113) continuously decreases in the direction from approaching to away from the partition (12).

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