A tail gas soot capture filter

Abstract

This invention relates to the field of flue gas treatment technology, and more particularly to a tail gas soot capture filter, comprising a cage frame and a metal filter bag. The cage frame has an air outlet and an air inlet, and the metal filter bag is detachably disposed inside the cage frame. The metal filter bag has several ventilation holes filled with metal powder, which forms flocculent filter pores by high-temperature sintering. One end of each filter pore is connected to the air outlet, and the other end is connected to the air inlet. This invention provides a tail gas soot capture filter that filters diesel engine exhaust gas using a metal filter bag, resulting in lower airflow resistance, less clogging of the airflow during filtration, and less increase in engine exhaust back pressure, thus promoting normal engine operation.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and in particular to a tail gas carbon soot capture filter. Background Technology

[0002] Currently, the main solution to diesel engine exhaust emissions relies on DPF technology to capture particulate matter (PM) in the exhaust gas, such as the DPF particulate filter disclosed in CN206928988U. Although existing DPF particulate filters can remove PM to a certain extent, they also have many shortcomings. For example, existing DPF particulate filters generally use a honeycomb ceramic carrier that alternately blocks the inlet and outlet of the carrier pores, forcing airflow through the porous walls to capture particles. Therefore, its air passage resistance is high, which can easily lead to air passage blockage and increase the exhaust back pressure of the engine, affecting engine performance. Summary of the Invention

[0003] In view of this, the present invention proposes an exhaust carbon soot capture filter, which filters the exhaust gas of diesel engines by setting a metal filter bag, resulting in low air passage resistance, making the air passage less likely to be blocked during the filtration process, and less likely to cause an increase in the exhaust back pressure of the engine, which is conducive to the normal operation of the engine. It solves the problem that the existing DPF particulate capture equipment has high structural resistance, which easily leads to air passage blockage and easily increases the exhaust back pressure of the engine, thus affecting the engine performance.

[0004] The technical solution of this invention is implemented as follows:

[0005] This invention provides an exhaust soot collection filter, comprising a cage-like frame and a metal filter bag, wherein...

[0006] The cage frame is provided with an air outlet and an air inlet, and the metal filter bag is detachably installed inside the cage frame.

[0007] The metal filter bag has several ventilation holes, which are filled with metal powder. The metal powder and the ventilation holes are sintered at high temperature to form flocculent filter holes.

[0008] One end of the filter hole is connected to the air outlet, and the other end is connected to the air inlet.

[0009] Based on the above technical solutions, preferably, the top, bottom, and sides of the cage frame are all hollow structures, wherein,

[0010] The air outlet is located on the inside of the hollow structure at the top of the cage-like frame.

[0011] The air inlet is located inside the hollowed-out structure at the bottom and sides of the cage-like frame.

[0012] Based on the above technical solutions, preferably, the air outlet matrix is ​​provided with a plurality of outlets, and a metal filter bag is provided below each air outlet.

[0013] Based on the above technical solutions, preferably, a flange is provided at the upper edge of the cage frame, wherein,

[0014] The flange has several bolt mounting holes that extend vertically along its upper edge.

[0015] Based on the above technical solutions, preferably, the top of the cage frame is provided with a handle.

[0016] Based on the above technical solutions, preferably, the metal filter bag comprises a plurality of metal mesh bags arranged side by side, wherein,

[0017] The metal mesh bag has an opening at its upper end, and the upper end of the metal mesh bag is embedded inside the air outlet.

[0018] The upper ends of the adjacent faces of two adjacent metal mesh bags are welded and fixed, and an air intake channel is formed between the lower ends of the adjacent faces of two adjacent metal mesh bags.

[0019] The mesh openings on the metal mesh bag are the ventilation holes, and the ventilation holes are rhomboid in shape.

[0020] Based on the above technical solutions, preferably, the metal mesh bag is wedge-shaped in both side and top views, wherein,

[0021] When viewed from the side, the air intake channel between adjacent metal mesh bags is V-shaped;

[0022] When viewed from above, the two adjacent metal mesh bags are arranged in a centrally symmetrical manner.

[0023] Based on the above technical solutions, preferably, the metal filter bag further includes a support plate, wherein...

[0024] One support plate is inserted inside each of the metal mesh bags, and the shape of the support plate matches the metal mesh bag.

[0025] An exhaust channel is formed between the support plate and the metal mesh bag, and the exhaust channel is arranged vertically.

[0026] Based on the above technical solutions, preferably, the support plate is bent into a corrugated shape using sheet metal methods, wherein...

[0027] The wave crest of the wave plate is V-shaped, and the wave height and wave base increase from one end of the wave plate shape to the other end. Each bend of the wave plate shape forms a ventilation channel.

[0028] Based on the above technical solutions, a preferred embodiment also includes a support frame, wherein...

[0029] One support frame is provided below each of the metal filter bags, and the metal filter bags are placed on the support frame.

[0030] The support frame is fixedly connected to the cage frame, and a first through hole is provided vertically along the upper edge of the support frame.

[0031] The exhaust soot collection filter of the present invention has the following advantages over the prior art:

[0032] (1) By setting up a metal filter bag, an outlet and an inlet, the exhaust gas of the diesel engine can easily enter the metal filter bag from the inlet for filtration, and the filtered exhaust gas is discharged from the outlet. During the process, the air passage resistance is small, so the air passage is not easily blocked and the exhaust back pressure of the engine is not easily increased, which is conducive to the normal operation of the engine. At the same time, due to the small air passage resistance, the back-flushing airflow is relatively smooth when cleaning the metal filter bag, which is conducive to the removal of carbon soot particles, improving the cleaning quality and facilitating the reuse of the metal filter bag.

[0033] (2) By detachably setting the metal filter bag inside the cage frame, it is easy to remove the metal filter bag, and thus it is easy to calcine the metal filter bag. Through calcine, the carbon soot particles in the metal filter bag can be burned into carbon powder, which is then easy to remove the carbon powder from the metal filter bag by blowing, thereby improving the cleaning quality of the metal filter bag and facilitating the reuse of the metal filter bag.

[0034] (3) By setting metal powder and air vents to form flocculent filter holes through high-temperature sintering, it is easy to increase the adsorption area, increase the number of carbon soot particles captured, and reduce black smoke emissions.

[0035] (4) By setting the metal mesh bags to be wedge-shaped when viewed from the side and from the top, and when viewed from the top, the two adjacent metal mesh bags are arranged in a centrally symmetrical manner, making the structure of the metal filter bag more compact and allowing for more metal mesh bags to be set in a single metal filter bag, which is beneficial to increase the adsorption area. At the same time, when viewed from the side, the air intake channel between adjacent metal mesh bags is V-shaped, so that the filter holes on the metal filter bags can all come into good contact with the flue gas, improving the quantity and quality of carbon soot particles captured and improving the treatment effect of diesel engine exhaust gas.

[0036] (5) By setting a support plate and bending it into a wave shape through sheet metal, the crest of the wave shape is V-shaped, and the wave height and wave bottom increase from one end of the wave shape to the other end. Each bend of the wave shape forms an exhaust channel. Through this structure, the cross-section of the exhaust channel is V-shaped, and the inner diameter of several exhaust channels is different. The V-shaped exhaust channels with different inner diameters can improve the flow characteristics of flue gas, reduce turbulence and eddies, make the flue gas inside the metal filter bag flow smoothly, and thus make the air passage resistance smaller, reduce the risk of blockage, and help the diesel engine to perform well. At the same time, the support plate structure of this shape has good strength, which can increase the structural strength of the metal filter bag, improve the impact resistance of the metal filter bag, and make it durable and not easily damaged. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a perspective view of a tail gas soot collection filter according to the present invention;

[0039] Figure 2 This is a perspective view of a tail gas soot collection filter according to the present invention.

[0040] Figure 3 This is an enlarged view of point A in the present invention;

[0041] Figure 4 This is a perspective view of the cage-like frame of the present invention;

[0042] Figure 5 This is a perspective view of the metal mesh bag of the present invention;

[0043] Figure 6 This is a perspective view of the metal filter bag of the present invention;

[0044] Figure 7 This is a top view of the metal filter bag of the present invention;

[0045] Figure 8 This is a schematic diagram illustrating the filtration and flow principle of the metal filter bag of the present invention;

[0046] Figure 9 This is a perspective view of the support plate of the present invention;

[0047] Figure 10 This is a structural diagram of the metal filter bag of the present invention;

[0048] Figure 11 This is a microstructure diagram of the metal powder of the present invention;

[0049] In the diagram: 1. Cage frame; 2. Metal filter bag; 3. Support frame; 4. Base plate; 21. Metal mesh bag; 22. Support plate; 31. Guide plate; 101. Air outlet; 102. Air inlet; 103. Flange; 201. Vent hole; 202. Metal powder; 203. Filter hole; 204. Air inlet channel; 205. Exhaust channel; 301. First through hole; 302. Second through hole. Detailed Implementation

[0050] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0051] like Figure 1-11 As shown, a tail gas soot collection filter of the present invention includes a cage frame 1 and a metal filter bag 2.

[0052] The cage frame 1 is used to install the metal filter bag 2. In use, the cage frame 1 is bolted to the flue. The large diesel engine soot collector uses a bottom-intake, top-exhaust airflow method through the cage frame 1. Specifically, as follows... Figure 1-4 As shown, the cage frame 1 is provided with an air outlet 101 and an air inlet 102. Figure 4 The cage-like frame 1 shown in the image has a hollow structure at the top, bottom, and sides. The inner side of the hollow structure at the top of the cage-like frame 1 is an air outlet 101; the inner side of the hollow structures at the bottom and sides of the cage-like frame 1 is an air inlet 102. For example... Figure 1 As shown, there are several outlets 101 in the matrix, and a metal filter bag 2 is set below each outlet 101. The metal filter bag 2 is detachably set inside the cage frame 1 to filter the flue gas.

[0053] like Figure 4 As shown, the cage frame 1 is fixed to the flue by flange installation. Specifically, a flange 103 is provided at the upper edge of the cage frame 1, and several bolt mounting holes are provided vertically along the upper edge of the flange 103. A handle is provided at the top of the cage frame 1. Bolts are installed in the bolt mounting holes to fix the cage frame 1. The handle facilitates the installation and placement of the cage frame 1.

[0054] The function of metal filter bag 2 is to capture carbon soot particles in flue gas, specifically, such as... Figure 10-11As shown, the metal filter bag 2 has several ventilation holes 201, which are filled with metal powder 202. The metal powder 202 and the ventilation holes 201 are sintered at high temperature to form flocculent filter holes 203. The filter holes 203 are used to filter and intercept carbon soot particles larger than 0.3 micrometers. Figure 8 and Figure 1 One end of the filter hole 203 is connected to the air outlet 101, and the other end is connected to the air inlet 102. During filtration, when the flue gas passes through the filter hole 203, the flocculent structure in the filter hole 203 captures the carbon soot particles in the flue gas, thereby achieving filtration.

[0055] In the structure of the metal filter bag 2, the metal filter bag 2 includes a number of metal mesh bags 21 arranged side by side.

[0056] Among them, such as Figure 5 As shown, a single metal mesh bag 21 is made of metal micro diamond mesh into a bag shape, with a bag opening at the top. The seams at the bottom and sides of the bag body are sealed by roll welding. The top end of the metal mesh bag 21 (i.e. the end with the bag opening) is used to be embedded inside the air outlet 101 for easy air exhaust.

[0057] The mesh on the metal mesh bag 21 has ventilation holes 201 as described above, filled with metal powder 202. The two are then fused together using high-temperature sintering technology. The metal micro-diamond mesh is a flattened diamond mesh with a certain porosity, with a pore size of approximately 2mm*1.5mm. The metal powder 202 consists of 500# fine metal particles in a spherical shape. The high-temperature sintering technology involves melting and bonding the fine metal powder particles at high temperatures in a vacuum sintering furnace, resulting in a sintering process with a certain porosity and high strength. Figure 10-11 As shown, after sintering, the metal powder 202 fills the pores of the micro-rhomboid micropores, forming a filter material substrate with a certain strength and a certain porosity. After the flue gas passes through the pores, the carbon soot particles remain in the metal powder 202. At the same time, the structural strength of the sintered metal filter bag 2 is improved, enhancing its impact resistance, durability, and resistance to damage.

[0058] Several metal mesh bags 21 in the metal filter bag 2 are also sealed and joined by roll welding. Specifically, for example... Figure 8 As shown, the upper ends of the adjacent surfaces of two adjacent metal mesh bags 21 are welded and fixed, and an air inlet channel 204 is formed between the lower ends of the adjacent surfaces of two adjacent metal mesh bags 21. After welding, the upper end of the air inlet channel 204 is closed, so that the flue gas can only enter the metal mesh bag 21 through the air inlet channel 204.

[0059] like Figure 6 As shown, several metal mesh bags 21 arranged side by side form a metal filter bag 2, and each metal filter bag 2 serves as a filtration unit, as shown in the figure. Figure 3As shown, a support frame 3 is welded and fixed to the bottom of each filter unit. Multiple filter units are inserted into the cage frame 1, with one end of the bag opening embedded in the air outlet 101, and then... Figure 2 As shown, a base plate 4 is fixed to the bottom of the cage frame 1 by bolts. The base plate 4 is used to support the support frame 3, so that the filter unit is held in the cage frame 1.

[0060] The function of support frame 3 is to support the filter unit and to guide the flue gas into the air intake channel 204. Specifically, as shown in the figure... Figure 3 As shown, a first through hole 301 is vertically provided on the support frame 3. The first through hole 301 is used to directly introduce the flue gas into the air intake channel 204. In addition, two guide plates 31 are provided on both sides of the support frame 3. The two guide plates 31 are arranged in a V-shape to allow the flue gas to converge better into the first through hole 301. Furthermore, in order to further improve the flue gas introduction effect, a second through hole 302 is provided between the guide plate 31 and the support frame 3. The second through hole 302 is used to assist in air intake, and the flue gas can enter the air intake channel 204 through the second through hole 302.

[0061] Furthermore, to improve the structural strength of the metal mesh bag 21, it is wedge-shaped in both side and top views, making it less prone to deformation. This helps the metal mesh bag 21 maintain an open state, which in turn facilitates the discharge of flue gas from the bag opening. Simultaneously, to increase the filtration area, such as... Figure 7 As shown, when viewed from above, two adjacent metal mesh bags 21 are arranged in a centrally symmetrical manner, resulting in a larger number of metal mesh bags 21 in a single metal filter bag 2, thereby increasing the adsorption area.

[0062] In addition, such as Figure 8 As shown, when viewed from the side, the air intake channel 204 between adjacent metal mesh bags 21 is V-shaped, which makes the air intake channel 204 smooth.

[0063] In the above structure, the small end and the lower end of the side of the wedge-shaped metal mesh bag 21 are roll-welded parts.

[0064] Further, such as Figure 8 As shown, the metal filter bag 2 also includes a support plate 22. The function of the support plate 22 is to open the metal mesh bag 21 so that the open state of the metal mesh bag 21 is better maintained. Specifically, one support plate 22 is inserted into the inside of each metal mesh bag 21 and welded and fixed. The shape of the support plate 22 matches the metal mesh bag 21. An exhaust channel 205 is formed between the support plate 22 and the metal mesh bag 21. The exhaust channel 205 is arranged vertically. The flue gas entering the metal mesh bag 21 reaches the bag opening along the exhaust channel 205 and then is discharged from the bag opening.

[0065] like Figure 9As shown, the support plate 22 is bent into a corrugated shape by sheet metal bending. The crests of the corrugated plate are V-shaped, and the wave height and trough increase from one end to the other. Each bend of the corrugated plate forms an exhaust channel 205. This shape makes the cross-section of the exhaust channel 205 V-shaped, and the inner diameters of several exhaust channels 205 are different. The different inner diameters of the V-shaped exhaust channels 205 improve the flow characteristics of the flue gas, reduce turbulence and eddies, and make the flue gas flow smoothly inside the metal filter bag 2. This reduces the air passage resistance, reduces the risk of blockage, and is beneficial to the performance of the diesel engine. At the same time, the support plate 22 of this shape can further increase the structural strength of the metal filter bag 2, improve its impact resistance, durability, and resistance to damage.

[0066] In addition, such as Figure 9 As shown, the lower end of the support plate 22 is also provided with a stress dispersion groove to leave stress margin for subsequent welding.

[0067] In addition, a comparative example is provided in this embodiment, as follows:

[0068] To ensure smooth exhaust emissions from diesel engines, exhaust resistance should be reduced while emissions pollution is minimized to meet environmental protection requirements. Table 1 shows a comparison of the parameters of the soot collector with those of the traditional DPF.

[0069]

[0070] Table 1 Comparison of parameters between soot collectors and traditional DPFs

[0071] The above comparative examples show that, compared with existing DPF particulate filters, the exhaust soot collection filter of the present invention has lower air passage resistance, is less prone to blockage during filtration, and is less likely to cause an increase in engine exhaust back pressure, which is beneficial to the normal operation of the engine.

[0072] The method of using the exhaust soot collection filter of the present invention is as follows:

[0073] When in use, the filter is installed on the exhaust duct of a large diesel engine. When the engine exhausts, the exhaust gas enters the intake passage 204 from the intake port 102, then passes through the filter hole 203 and enters the exhaust passage 205, and then exhausts from the bag opening. During the process, the metal filter bag 2 captures carbon soot particles in the exhaust gas.

[0074] During cleaning, the collector is disassembled, and then compressed air is introduced into the bag opening for backflushing to blow away the carbon soot particles in the metal filter bag 2. Alternatively, the disassembled collector can be calcined at high temperature to turn the captured carbon soot particles into powder, which can then be backflushed. This method is effective and facilitates regeneration.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tail gas soot collection filter, comprising a cage frame (1), characterized in that: It also includes metal filter bags (2), wherein, The cage frame (1) is provided with an air outlet (101) and an air inlet (102), and the metal filter bag (2) is detachably provided inside the cage frame (1). The metal filter bag (2) includes a plurality of metal mesh bags (21) arranged side by side, wherein the upper end of the metal mesh bag (21) is provided with a bag opening, and the upper end of the metal mesh bag (21) is embedded in the inner side of the air outlet (101). The upper ends of the adjacent surfaces of two adjacent metal mesh bags (21) are welded and fixed, and an air intake channel (204) is formed between the lower ends of the adjacent surfaces of two adjacent metal mesh bags (21). The mesh holes on the metal mesh bag (21) are ventilation holes (201), and the ventilation holes (201) are rhomboid in shape; The ventilation hole (201) is filled with metal powder (202). The metal mesh bag (21) is a flattened diamond mesh with a pore size of 2mm*1.5mm. The metal powder (202) is 500# fine metal powder particles with spherical shape. The metal powder (202) and the ventilation hole (201) are sintered at high temperature to form a flocculent filter hole (203) for filtering and intercepting carbon soot particles larger than 0.3 microns. One end of the filter hole (203) is connected to the air outlet (101), and the other end is connected to the air inlet (102); The top, bottom and sides of the cage frame (1) are all hollow structures. The inner side of the hollow structure at the top of the cage frame (1) is the air outlet (101); the inner side of the hollow structure at the bottom and sides of the cage frame (1) is the air inlet (102); the air outlet (101) is arranged in a matrix of several, and a metal filter bag (2) is arranged below each air outlet (101).

2. The exhaust soot collection filter as described in claim 1, characterized in that: The top of the cage frame (1) is provided with a handle.

3. The exhaust soot collection filter as described in claim 1, characterized in that: The metal mesh bag (21) is wedge-shaped in both side and top views, wherein, When viewed from the side, the air intake channel (204) between adjacent metal mesh bags (21) is V-shaped; When viewed from above, the two adjacent metal mesh bags (21) are arranged in a centrally symmetrical manner.

4. The exhaust soot collection filter as described in claim 3, characterized in that: The metal filter bag (2) also includes a support plate (22), wherein, One of the support plates (22) is inserted inside each of the metal mesh bags (21), and the shape of the support plate (22) matches that of the metal mesh bag (21); An exhaust channel (205) is formed between the support plate (22) and the metal mesh bag (21), and the exhaust channel (205) is arranged vertically.

5. The exhaust soot collection filter as described in claim 4, characterized in that: The support plate (22) is bent into a wave shape by sheet metal bending, wherein, The wave crest of the wave plate is V-shaped, and the wave height and wave base increase from one end of the wave plate shape to the other end. Each bend of the wave plate shape forms a ventilation channel (205).

6. The exhaust soot collection filter as described in claim 1, characterized in that: A flange (103) is provided at the upper edge of the cage frame (1), wherein, The flange (103) has several bolt mounting holes that extend vertically along its upper edge.

7. The exhaust soot collection filter as described in claim 1, characterized in that: It also includes a support frame (3), wherein, One support frame (3) is provided below each of the metal filter bags (2), and the metal filter bags (2) are placed on the support frame (3); The support frame (3) is fixedly connected to the cage frame (1), and a first through hole (301) is provided vertically along the upper edge of the support frame (3).

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