Tail gas soot trapping filter

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a tail gas soot trapping filter which comprises a cage type frame and a metal filter bag, a gas outlet and a gas inlet are formed in the cage type frame, and the metal filter bag is detachably arranged in the cage type frame; a plurality of vent holes are formed in the metal filter bag, the vent holes are filled with metal powder, and flocculent filter holes are formed by the metal powder and the vent holes in a high-temperature sintering mode; one end of the filter hole is communicated with the air outlet, and the other end of the filter hole is communicated with the air inlet; according to the tail gas soot collecting filter, the metal filter bag is arranged to filter tail gas of a diesel engine, so that the resistance of an air channel is small, the air channel is not prone to being blocked in the filtering process, the exhaust back pressure of the engine is not prone to being increased, and normal operation of the engine is facilitated.

Description

Technical Field

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

[0002] Diesel engines are widely used in large ships, special vehicles and military equipment due to their high efficiency and powerful power output. However, during the startup and operation of these devices, due to factors such as frequent startup, poor ventilation in the working environment and uneven fuel quality, the exhaust emissions contain a large amount of soot particulate matter (PM). These PM not only cause serious pollution to the environment, but also pose a threat to human health, especially fine particles less than 2.5 microns, which can directly enter the human respiratory system and cause various respiratory and lung diseases. In addition, in some operating environments where concealment is required, such as during the navigation of ships, a large amount of black smoke emissions will also reduce the stealth performance of the ship and increase the risk of detection.

[0003] At present, in order to solve the problem of diesel engine exhaust emissions, the DPF technology is mainly relied on to capture PM in the exhaust gas, such as a DPF particle trap disclosed in CN206928988U. Although the existing DPF particle trap device can remove PM to a certain extent, it also has many shortcomings. For example, the existing DPF particle trap device generally uses a honeycomb ceramic carrier to alternately block the inlet and outlet of the carrier hole, forcing the airflow to pass through the porous wall to capture particles. Therefore, its airway resistance is relatively high, which is easy to cause the airway to be blocked, and it is easy to increase the exhaust back pressure of the engine, affecting the performance of the engine. Summary of the invention

[0004] In view of this, the present invention proposes an exhaust soot capture filter, which filters the exhaust gas of the diesel engine by arranging a metal filter bag, so that the airway resistance is small, the airway is not easily blocked during the filtering process, and the exhaust back pressure of the engine is not easily increased, which is beneficial to the normal operation of the engine. It solves the problem that the existing DPF particle capture equipment has high structural resistance, which is easy to cause the airway to be blocked, and it is easy to increase the exhaust back pressure of the engine, affecting the performance of the engine.

[0005] The technical solution of the present invention is achieved in this way:

[0006] The present invention provides a tail gas carbon soot capture filter, comprising a cage frame and a metal filter bag, wherein:

[0007] The cage frame is provided with an air outlet and an air inlet, and the metal filter bag is detachably provided inside the cage frame;

[0008] The metal filter bag has a plurality of ventilation holes, the ventilation holes are filled with metal powder, and the metal powder and the ventilation holes are sintered at high temperature to form flocculent filter holes;

[0009] One end of the filter hole is communicated with the air outlet, and the other end is communicated with the air inlet.

[0010] On the basis of the above technical solution, preferably, the top, bottom and side of the cage frame are all hollow structures, wherein:

[0011] The inner side of the hollow structure at the top of the cage frame is the air outlet;

[0012] The inner sides of the hollow structures at the bottom and sides of the cage-type frame are the air inlets.

[0013] On the basis of the above technical solution, preferably, the air outlet matrix is ​​provided with a plurality of air outlets, and a corresponding metal filter bag is provided under each air outlet.

[0014] On the basis of the above technical solution, preferably, a flange is provided at the edge of the upper end of the cage frame, wherein:

[0015] A plurality of bolt mounting holes are vertically arranged on the upper edge of the flange.

[0016] On the basis of the above technical solution, preferably, a handle is provided on the top of the cage frame.

[0017] On the basis of the above technical solution, preferably, the metal filter bag comprises a plurality of metal mesh bags arranged side by side, wherein:

[0018] The upper end of the metal mesh bag is provided with a bag opening, and the upper end of the metal mesh bag is embedded in the inner side of the air outlet;

[0019] The upper ends of the adjacent surfaces of two adjacent metal mesh bags are welded and fixed, and an air intake channel is formed between the lower ends of the adjacent surfaces of the two adjacent metal mesh bags;

[0020] The mesh holes on the metal mesh bag are the ventilation holes, and the shape of the ventilation holes is rhombus.

[0021] On the basis of the above technical solution, preferably, the metal mesh bag is wedge-shaped when viewed from the side and from above, wherein:

[0022] When viewed from the side, the air inlet passages between adjacent metal mesh bags are in a V shape;

[0023] When viewed from above, two adjacent metal mesh bags are arranged in central symmetry.

[0024] On the basis of the above technical solution, preferably, the metal filter bag further includes a support plate, wherein:

[0025] The support plate is inserted into each metal mesh bag, and the shape of the support plate matches the metal mesh bag;

[0026] An exhaust channel is formed between the support plate and the metal mesh bag, and the exhaust channel is vertically arranged.

[0027] On the basis of the above technical solution, preferably, the support plate is bent into a wave plate shape by sheet metal, wherein:

[0028] The wave crest of the wave plate shape is V-shaped, and the wave height and wave bottom increase from one end to the other end of the wave plate shape, and each bend of the wave plate shape forms an exhaust channel.

[0029] On the basis of the above technical solution, preferably, it further comprises a support frame, wherein:

[0030] The support frame is correspondingly arranged below each of the metal filter bags, and the metal filter bags are placed on the support frame;

[0031] The support frame is fixedly connected to the cage frame, and a first through hole is vertically penetrated on the support frame.

[0032] The exhaust soot capture filter of the present invention has the following beneficial effects compared with the prior art:

[0033] (1) By setting the metal filter bag, the air outlet and the air inlet, the exhaust gas of the diesel engine can enter the metal filter bag from the air inlet for filtration, and the filtered exhaust gas is discharged from the air outlet. During the process, the airway resistance is small, so the airway is not easy to be blocked, and it is not easy to cause the exhaust back pressure of the engine to increase, which is beneficial to the normal operation of the engine. At the same time, due to the small airway resistance, when the metal filter bag is back-blown to clean, the back-blown airflow is relatively smooth, which is beneficial to the separation of carbon soot particles, improves the cleaning quality, and is beneficial to the reuse of the metal filter bag.

[0034] (2) By detachably arranging the metal filter bag inside the cage frame, it is convenient to remove the metal filter bag, and then to calcine the metal filter bag. The soot particles in the metal filter bag can be burned into carbon powder by calcination, and then the carbon powder can be easily separated 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.

[0035] (3) By setting metal powder and ventilation holes through high-temperature sintering to form flocculent filter holes, it is convenient to increase the adsorption area, increase the number of captured carbon soot particles, reduce black smoke emissions, and facilitate the concealment of ships.

[0036] (4) By setting the metal mesh bag to be wedge-shaped when viewed from the side and from above, and by arranging two adjacent metal mesh bags to be centrally symmetrical when viewed from above, the structure of the metal filter bag is relatively compact, and the number of metal mesh bags in a single metal filter bag can be greater, 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 bag can all be in good contact with the flue gas, thereby increasing the quantity and quality of soot particles captured and improving the treatment effect of diesel engine exhaust.

[0037] (5) The support plate is bent into a wave plate shape by sheet metal, and the wave crest of the wave plate shape is V-shaped, and the wave height and wave bottom increase from one end of the wave plate shape to the other end. Each bend of the wave plate shape forms an exhaust channel. Through this structure, the cross-section of the exhaust channel is V-shaped, and the inner diameters of several exhaust channels are different. The V-shaped exhaust channels with different inner diameters can improve the flow characteristics of the flue gas, reduce turbulence and eddy currents, and make the flue gas inside the metal filter bag flow smoothly, thereby making the airway resistance smaller, reducing the risk of blockage, and being beneficial to the performance of the diesel engine. At the same time, the support plate of this shape has good structural strength, which can increase the structural strength of the metal filter bag, improve the impact resistance of the metal filter bag, and have good durability and are not easy to damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A three-dimensional diagram of an exhaust soot trapping filter according to the present invention;

[0040] Figure 2 A three-dimensional diagram of an exhaust soot capture filter of the present invention from another perspective;

[0041] Figure 3 This is an enlarged view of point A of the present invention;

[0042] Figure 4 A three-dimensional diagram of a cage frame of the present invention;

[0043] Figure 5 A three-dimensional diagram of a metal mesh bag of the present invention;

[0044] Figure 6 is a three-dimensional diagram of a metal filter bag of the present invention;

[0045] Figure 7 A top view of a metal filter bag of the present invention;

[0046] Figure 8 It is a schematic diagram of the filtering and circulation principle of the metal filter bag of the present invention;

[0047] Fig. 9 is a three-dimensional diagram of a support plate of the present invention;

[0048] Fig.10 This is a structural diagram of a metal filter bag of the present invention;

[0049] Fig.11 This is a microstructure diagram of the metal powder of the present invention;

[0050] In the figure: 1, cage frame; 2, metal filter bag; 3, support frame; 4, bottom plate; 21, metal mesh bag; 22, support plate; 31, guide plate; 101, air outlet; 102, air inlet; 103, flange; 201, air vent; 202, metal powder; 203, filter hole; 204, air inlet channel; 205, exhaust channel; 301, first through hole; 302, second through hole. DETAILED DESCRIPTION

[0051] The following will be combined with the specific implementation of the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figure 1-11 As shown, a tail gas soot capture filter of the present invention comprises a cage frame 1 and a metal filter bag 2.

[0053] The cage frame 1 is used to install the metal filter bag 2. When in use, the cage frame 1 is installed on the flue by bolts. The large diesel engine soot collector adopts the method of lower air intake and upper air outlet to flow through the cage frame 1. Specifically, 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 frame 1 shown in the figure has a hollow structure at the top, bottom and side of the cage frame 1, wherein the inner side of the hollow structure at the top of the cage frame 1 is an air outlet 101; the inner side of the hollow structure at the bottom and side of the cage frame 1 is an air inlet 102; Figure 1 As shown, a plurality of air outlets 101 are arranged in a matrix, and a metal filter bag 2 is arranged correspondingly below each air outlet 101 , wherein the metal filter bag 2 is detachably arranged inside the cage frame 1 for filtering smoke.

[0054] like Figure 4 As shown, the cage frame 1 is fixed on the flue by flange installation. Specifically, a flange 103 is provided at the edge of the upper end of the cage frame 1, wherein a plurality of bolt mounting holes are vertically provided on the flange 103; a handle is provided on the top of the cage frame 1, and bolts are installed in the bolt mounting holes, through which the cage frame 1 is fixed, and the handle facilitates the installation and placement of the cage frame 1.

[0055] The function of the metal filter bag 2 is to capture soot particles in the flue gas, specifically, Figure 10-11 As shown, the metal filter bag 2 has a plurality of vent holes 201, and the vent holes 201 are filled with metal powder 202. The metal powder 202 and the vent holes 201 are sintered at high temperature to form flocculent filter holes 203, and the filter holes 203 are used to filter and intercept carbon soot particles larger than 0.3 microns; 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 filtering, when the smoke passes through the filter hole 203, the flocculent structure in the filter hole 203 captures the carbon soot particles in the smoke to achieve filtering.

[0056] In the structure of the metal filter bag 2, the metal filter bag 2 includes a plurality of metal mesh bags 21 arranged side by side.

[0057] Among them, Figure 5 As shown, a single metal mesh bag 21 is made of a metal micro-diamond mesh into a bag shape, a bag opening is arranged at the upper end, and the seams at the bottom and sides of the bag body are sealed by roll welding, wherein the upper end of the metal mesh bag 21 (i.e., the end with the bag opening) is used to be embedded in the inner side of the air outlet 101 to facilitate exhaust.

[0058] The mesh holes on the metal mesh bag 21 are the above-mentioned vent holes 201, and the holes are filled with metal powder 202, and then the two are melted together by high-temperature sintering technology, wherein the metal micro-diamond mesh is a flattened diamond mesh with a certain opening rate, and the pore size is about 2mm*1.5mm, and the metal powder 202 is 500# metal fine powder particles, and the particles are spherical. The high-temperature sintering technology is a sintering technology that uses a vacuum sintering furnace to melt and adhere the metal fine powder particles at high temperature, and has a certain porosity and high strength. Figure 10-11 As shown, after sintering, the metal powder 202 is filled in the holes of the micro-diamond pores to form a filter material substrate with a certain strength and a certain porosity. After the flue gas passes through the pores, the soot particles remain in the metal powder 202. At the same time, the structural strength of the sintered metal filter bag 2 improves its impact resistance, durability, and is not easy to damage.

[0059] The metal mesh bags 21 in the metal filter bag 2 are also sealed and joined by rolling welding. Specifically, 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 the two adjacent metal mesh bags 21. After welding, the upper end of the air inlet channel 204 is closed, so that the smoke can only enter the metal mesh bag 21 from the air inlet channel 204.

[0060] like Figure 6 As shown, a plurality of metal mesh bags 21 arranged side by side form a metal filter bag 2, and each metal filter bag 2 serves as a filter unit. Figure 3 As shown, a support frame 3 is welded and fixed at the bottom of each filter unit, and multiple filter units are inserted into the cage frame 1, and one end of the bag mouth is embedded in the air outlet 101, and then Figure 2 As shown, a bottom plate 4 is fixed to the bottom of the cage frame 1 by bolts, and the bottom plate 4 is used to support the support frame 3 so that the filter unit is retained in the cage frame 1 .

[0061] The function of the support frame 3 is to support the filter unit and to guide the smoke into the air inlet channel 204. Specifically, Figure 3 As shown, a first through hole 301 is vertically provided on the upper edge of the support frame 3, and the first through hole 301 is used to directly introduce the smoke into the air intake channel 204. In addition, two guide plates 31 are provided on both sides of the support frame 3, and the two guide plates 31 are arranged in an eight-shaped shape, so that the smoke can be better gathered to the first through hole 301. In addition, in order to further improve the smoke introduction effect, a second through hole 302 is provided between the guide plate 31 and the support frame 3, and the second through hole 302 is used for auxiliary air intake, and the smoke can enter the air intake channel 204 from the second through hole 302.

[0062] In addition, in order to improve the structural strength of the metal mesh bag 21, the metal mesh bag 21 is wedge-shaped when viewed from the side and from above, and is not easily deformed, which is conducive to the metal mesh bag 21 remaining open, thereby facilitating the discharge of smoke from the bag opening of the metal mesh bag 21. At the same time, in order to increase the filtering area, such as Figure 7 As shown, when viewed from above, two adjacent metal mesh bags 21 are arranged in a centrally symmetrical manner, so that the number of metal mesh bags 21 in a single metal filter bag 2 is large, thereby increasing the adsorption area.

[0063] In addition, if Figure 8 As shown, when viewed from the side, the air inlet channel 204 between adjacent metal mesh bags 21 is in a V shape, so that the air inlet channel 204 can intake air smoothly.

[0064] In the above structure, the small end portion and the lower end portion of the side portion of the wedge-shaped metal mesh bag 21 are the roll-welded portions.

[0065] Further, such as Figure 8As shown, the metal filter bag 2 also includes a support plate 22, wherein the function of the support plate 22 is to prop open the metal mesh bag 21 so that the open state of the metal mesh bag 21 can be better maintained. Specifically, a support plate 22 is inserted into the interior of each metal mesh bag 21 and welded and fixed, and 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, and the exhaust channel 205 is vertically arranged; the smoke entering the metal mesh bag 21 reaches the bag opening along the exhaust channel 205, and then is discharged from the bag opening.

[0066] like Fig. 9 As shown, the support plate 22 is bent into a wave plate shape by sheet metal, wherein the wave crest of the wave plate shape is V-shaped, and the wave height and wave bottom increase from one end of the wave plate shape to the other end, and each bend of the wave plate shape forms an exhaust channel 205; through this shape, the cross-section of the exhaust channel 205 is V-shaped, and the inner diameters of several exhaust channels 205 are different, and then the V-shaped exhaust channels 205 with different inner diameters are used to improve the flow characteristics of the flue gas, reduce turbulence and eddy currents, and make the flue gas inside the metal filter bag 2 flow smoothly, thereby making the airway resistance smaller, reducing the risk of blockage, and being 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, and have good durability and is not easy to be damaged.

[0067] In addition, if Fig. 9 As shown, a stress dispersion groove is also provided at the lower end of the support plate 22 to leave a stress margin for subsequent welding.

[0068] In addition, in this embodiment, a comparative example is also provided, which is as follows:

[0069] In order to ensure the smooth exhaust emission of diesel engines, the emission resistance should be reduced, while reducing emission pollution to meet environmental protection requirements. The parameters of the soot collector and the traditional DPF are compared in Table 1.

[0070]

[0071]

[0072] Table 1 Parameter comparison between soot trap and traditional DPF

[0073] Through the above comparative examples, it can be concluded that compared with the existing DPF particle collection device, the exhaust soot collection filter of the present invention has smaller airway resistance, is not easy to be blocked in the airway during the filtration process, and is not easy to cause the exhaust back pressure of the engine to increase, which is beneficial to the normal operation of the engine.

[0074] The method of using a tail gas soot capture filter of the present invention is as follows:

[0075] When in use, the collector is installed on the flue of a large diesel engine. When the engine is exhausting smoke, the smoke enters the intake channel 204 from the air inlet 102, then passes through the filter hole 203 and enters the exhaust channel 205, and then is exhausted from the bag mouth. During the process, the metal filter bag 2 captures the carbon soot particles in the smoke.

[0076] When cleaning, the collector is disassembled, and then compressed air is introduced into the bag mouth for backblowing to blow away the carbon soot particles in the metal filter bag 2. In addition, the disassembled collector can be calcined at high temperature to turn the captured carbon soot particles into powder, which is then backblown, which has a better effect and is convenient for recycling.

[0077] 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 protection scope of the present invention.

Claims

1. A tail gas soot capture filter, comprising a cage frame (1), characterized in that: Also included is a metal filter bag (2), wherein: The cage-type 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-type frame (1); The metal filter bag (2) has a plurality of ventilation holes (201), the ventilation holes (201) are filled with metal powder (202), and the metal powder (202) and the ventilation holes (201) are sintered at high temperature to form flocculent filter holes (203); One end of the filter hole (203) is in communication with the air outlet (101), and the other end is in communication with the air inlet (102).

2. The exhaust soot capture filter according to claim 1, characterized in that: The top, bottom and sides of the cage frame (1) are all hollow structures, wherein: The inner side of the hollow structure at the top of the cage-type frame (1) is the air outlet (101); The air inlet (102) is located inside the hollow structure at the bottom and side of the cage-type frame (1).

3. The exhaust soot capture filter according to claim 2, characterized in that: A plurality of gas outlets (101) are arranged in a matrix, and a corresponding metal filter bag (2) is arranged below each gas outlet (101).

4. The exhaust soot trapping filter according to claim 3, characterized in that: A flange (103) is provided at the edge of the upper end of the cage frame (1), wherein: A plurality of bolt installation holes are vertically provided on the upper side of the flange (103).

5. The exhaust soot trapping filter according to claim 4, characterized in that: A handle is provided on the top of the cage frame (1).

6. The exhaust soot trapping filter according to claim 1, characterized in that: The metal filter bag (2) comprises 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 inside 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 the two adjacent metal mesh bags (21); The mesh holes on the metal mesh bag (21) are the ventilation holes (201), and the shape of the ventilation holes (201) is a rhombus.

7. The exhaust soot trapping filter according to claim 6, characterized in that: The metal mesh bag (21) is wedge-shaped when viewed from the side or from above, wherein: When viewed from the side, the air inlet passage (204) between adjacent metal mesh bags (21) is in a V shape; When viewed from above, two adjacent metal mesh bags (21) are arranged in a centrally symmetrical manner.

8. The exhaust soot trapping filter according to claim 7, characterized in that: The metal filter bag (2) further comprises a support plate (22), wherein: One support plate (22) is inserted into each metal mesh bag (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.

9. The exhaust soot trapping filter according to claim 8, characterized in that: The support plate (22) is bent into a wave plate shape by sheet metal method, wherein: The wave crest of the wave plate shape is V-shaped, and the wave height and wave bottom increase from one end of the wave plate shape to the other end, and each bend of the wave plate shape forms an exhaust channel (205).

10. The exhaust soot trapping filter according to claim 1, characterized in that: It also includes a support frame (3), wherein: The support frame (3) is correspondingly arranged 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 vertically penetrated on the support frame (3).

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