A waste gas treatment device for biomass gasification furnace

Abstract

The present invention discloses a waste gas treatment device for a biomass gasifier applied in the field of waste gas treatment. The device adds a star-shaped self-recovering cage frame on the basis of an existing filter bag, and utilizes the shape characteristics of the star-shaped self-recovering cage frame to allow the filter bag to have a more obvious shape change before and after expansion, thereby effectively improving the pulse blowing effect on compacted dust. A bottom enhanced filter bag is added near the air inlet of the main filter bag, and a star-shaped dust filter speed reduction cage frame and an elastic anti-impact ring are arranged inside. The elastic anti-impact ring and the star-shaped dust filter speed reduction cage frame are used to effectively absorb the impact force of dust, effectively improve the impact resistance of the bottom of the filter bag, and the star-shaped dust filter speed reduction cage frame is used to reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the local wear degree of the filter bag, thereby increasing the service life of the filter bag, achieving an improved dust removal effect of the filter bag, and effectively improving the impact resistance of the bottom of the filter bag.

Description

Technical Field

[0001] The invention relates to the field of waste gas treatment, and in particular to a waste gas treatment device for a biomass gasifier. Background Art

[0002] The straw gas produced by the biomass gas stove is a green new energy with strong vitality. Since the raw materials of plant gas are crop straw, forest waste, edible fungus residue, cattle and sheep manure and all combustible materials, it is an inexhaustible renewable resource.

[0003] A large amount of waste gas will be generated during the operation of the biomass gasification furnace. These waste gases need to be filtered before they can be discharged. The most commonly used filter in biomass power generation is the bag filter. The current bag filters all have their own cleaning system. The mainstream is pulse injection, which uses a pulse valve to blow compressed air into the filter bag to make the filter bag expand and vibrate instantly, thereby achieving the purpose of cleaning. However, the shapes of existing filter bags are similar, and the shape changes before and after expansion are not much different, which leads to poor cleaning effect, especially for compacted dust. In addition, since the bottom of the filter bag is close to the air inlet, the dust will directly impact the filter bag, which is easy to cause serious wear and tear of the local filter bag and then perforation, greatly reducing the service life of the filter bag.

[0004] To this end, we use this technical solution to solve the problems of poor cleaning effect and easy damage to the bottom of the existing filter bag. Summary of the invention

[0005] The purpose of the present invention is to improve the filter bag in the prior art, and to provide a waste gas treatment device for a biomass gasification furnace compared to the prior art, by adding a star-shaped self-recovering cage frame on the basis of the existing filter bag, and utilizing the shape characteristics of the star-shaped self-recovering cage frame to allow the filter bag to have a more obvious shape change before and after expansion, thereby effectively improving the pulse blowing effect on compacted dust, by adding a bottom enhanced filter bag near the air inlet of the main filter bag, and arranging a star-shaped dust filter speed reduction cage frame and an elastic anti-impact ring inside the bottom enhanced filter bag, utilizing the offsetting effect of the elastic anti-impact ring and the star-shaped dust filter speed reduction cage frame to effectively absorb the dust impact force exerted on the bottom enhanced filter bag, effectively improving the anti-impact effect of the bottom of the filter bag, and utilizing the star-shaped dust filter speed reduction cage frame to reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the local wear of the filter bag, thereby increasing the service life of the filter bag.

[0006] It can improve the dust removal effect of the filter bag and effectively improve the impact resistance of the bottom of the filter bag, thereby effectively increasing the service life of the filter bag.

[0007] Furthermore, the structures of self-recovering connection angle 1 and self-recovering connection angle 2 are the same. Self-recovering connection angle 1 includes an outer wrapping layer, and the inner wall of the outer wrapping layer is fixedly inlaid with an embedded layer. Self-recovering connection angle 1 and self-recovering connection angle 2 play the role of connecting solid lightweight bone rods, and after the star-shaped self-recovering cage frame expands instantaneously due to pulse blowing, the recovery elastic force can be used to quickly restore the star-shaped self-recovering cage frame. Both the outer wrapping layer and the embedded layer have good elastic force, among which the outer wrapping layer plays the role of auxiliary elastic force, and the embedded layer plays the role of main elastic force.

[0008] Furthermore, a protective gasket is fixedly connected between the star-shaped self-recovering cage frame and the inner wall of the main filter bag, and the protective gasket is made of high-temperature resistant silicone material. The protective gasket plays a protective role between the star-shaped self-recovering cage frame and the main filter bag, thereby preventing the main filter bag from being damaged due to the back-and-forth deformation of the star-shaped self-recovering cage frame when the star-shaped self-recovering cage frame is directly connected to the main filter bag.

[0009] Optionally, the lower end of the main filter bag is also fixedly connected to a bottom reinforced filter bag, and the bottom reinforced filter bag is connected to the main filter bag, the inner wall of the bottom reinforced filter bag is fixedly connected to a star-shaped dust filter speed reduction cage frame, an elastic anti-impact ring is placed in the middle of the star-shaped dust filter speed reduction cage frame, and the elastic anti-impact ring is in contact with each obtuse corner of the star-shaped dust filter speed reduction cage frame, each obtuse corner of the star-shaped dust filter speed reduction cage frame is fixedly connected with a positioning slide rod, and the positioning slide rod passes through the elastic anti-impact ring and is slidably connected to the same, the bottom reinforced filter bag is located at the lower end close to the air inlet of the dust collector, because the dust speed at the air inlet is high and directly impacts the filter bag, a star-shaped dust filter speed reduction cage is arranged inside the bottom reinforced filter bag. The star-shaped dust filter speed reduction cage frame and the elastic anti-impact ring utilize the offsetting effect of the elastic anti-impact ring on the star-shaped dust filter speed reduction cage frame to effectively improve the impact resistance of the bottom enhanced filter bag, and avoid the bottom enhanced filter bag being perforated by the long-term impact of dust. Moreover, since the star-shaped dust filter speed reduction cage frame also has a dust filtering effect, the resistance formed by the two dust filtering effects is utilized to effectively reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the wear of the bottom enhanced filter bag and increasing the service life of the filter bag. By connecting the positioning slide bar to the star-shaped dust filter speed reduction cage frame, the positioning slide bar telescopes and slides back and forth on the elastic anti-impact ring before and after the bottom enhanced filter bag expands, thereby achieving the fixation of the elastic anti-impact ring.

[0010] Optionally, the star-shaped dust filter speed reduction cage frame includes multiple porous dust filter plates, and two adjacent porous dust filter plates are fixedly connected at the acute corner with a high temperature resistant connecting corner 1, and two adjacent porous dust filter plates are fixedly connected at the obtuse corner with a high temperature resistant connecting corner 2. The star-shaped dust filter speed reduction cage frame has the same function as the star-shaped self-recovering cage frame, which is to allow the bottom enhanced filter bag to reset after expansion, but the porous dust filter plate is different from the solid lightweight bone rod. The function of the solid lightweight bone rod is to connect the star-shaped self-recovering cage frame to the main filter bag, and the porous dust filter plate not only plays a connecting role, but also uses its own dust filtering resistance to effectively reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the degree of wear of the bottom enhanced filter bag, thereby effectively avoiding local perforation of the bottom enhanced filter bag during long-term use, and improving the service life of the bottom enhanced filter bag.

[0011] Optionally, the porous dust filter plate is made of wear-resistant material, and the high-temperature resistant connecting corner one and the high-temperature resistant connecting corner two are made of high-temperature resistant elastic material. The gas first passes through the bottom enhanced filter bag and then passes through the porous dust filter plate. In this way, the dust has undergone two filtrations, which effectively improves the dust filtering effect at the bottom of the filter bag. The resistance formed by the dust filtering effect of the porous dust filter plate can also effectively protect the bottom enhanced filter bag from excessive wear by dust. Since the dust temperature at the air inlet is high, the high-temperature resistant connecting corner one and the high-temperature resistant connecting corner two are made of high-temperature resistant material to prevent the elastic force from failing.

[0012] Optionally, the outer surfaces of the main filter bag and the bottom reinforced filter bag are coated with a fireproof layer, and the bottom of the bottom reinforced filter bag is made of a flexible, airtight material. In order to prevent dust with sparks from burning the main filter bag and the bottom reinforced filter bag, both outer surfaces are coated with a fireproof layer, and kaolin is preferably used for the fireproof layer. The bottom of the bottom reinforced filter bag mainly realizes the function of connection and closure, so a flexible, airtight material is used.

[0013] Optionally, the air permeability of the star-shaped dust filter speed reduction cage frame is better than that of the bottom enhanced filter bag, and the height of the star-shaped dust filter speed reduction cage frame is equal to the height of the bottom enhanced filter bag. The star-shaped dust filter speed reduction cage frame allows the bottom enhanced filter bag to expand and deform while also playing a filtering role. The dust will pass through two internal and external filtrations, effectively improving the dust filtering effect. Moreover, since the bottom enhanced filter bag is close to the bottom air inlet, the air flow speed here is large. The resistance formed by the star-shaped dust filter speed reduction cage frame during dust filtering can effectively reduce the speed of the air flow through the bottom enhanced filter bag, thereby effectively reducing the wear of the bottom enhanced filter bag, thereby increasing the service life. In order to allow the star-shaped dust filter speed reduction cage frame to fully contact the bottom enhanced filter bag, the height of the star-shaped dust filter speed reduction cage frame is equal to the height of the bottom enhanced filter bag.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] (1) This scheme adds a star-shaped self-recovering cage frame to the existing filter bag, and uses the shape characteristics of the star-shaped self-recovering cage frame to make the filter bag have a more obvious shape change before and after expansion, thereby effectively improving the pulse blowing effect on compacted dust. By adding a bottom enhanced filter bag near the air inlet of the main filter bag, and arranging a star-shaped dust filter speed reduction cage frame and an elastic impact-resistant ring inside the bottom enhanced filter bag, the elastic impact-resistant ring and the star-shaped dust filter speed reduction cage frame are used to effectively absorb the dust impact force on the bottom enhanced filter bag, effectively improving the impact resistance of the bottom of the filter bag, and using the star-shaped dust filter speed reduction cage frame to reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the local wear of the filter bag, thereby increasing the service life of the filter bag, achieving an improved dust removal effect of the filter bag, and effectively improving the impact resistance of the bottom of the filter bag, thereby effectively increasing the service life of the filter bag.

[0016] (2) The structures of the self-recovering connection angle 1 and the self-recovering connection angle 2 are the same. The self-recovering connection angle 1 includes an outer wrapping layer, and the inner wall of the outer wrapping layer is fixedly inlaid with an embedded layer. The self-recovering connection angle 1 and the self-recovering connection angle 2 play the role of connecting solid lightweight bone rods. Moreover, after the star-shaped self-recovering cage frame is instantly expanded due to pulse injection, the star-shaped self-recovering cage frame can be quickly reset by utilizing the recovery elastic force. Both the outer wrapping layer and the embedded layer have good elastic force, among which the outer wrapping layer plays the role of auxiliary elastic force, and the embedded layer plays the role of main elastic force.

[0017] (3) A protective gasket is fixedly connected between the star-shaped self-restoring cage frame and the inner wall of the main filter bag, and the protective gasket is made of high-temperature resistant silicone material. The protective gasket plays a protective role between the star-shaped self-restoring cage frame and the main filter bag, avoiding damage to the main filter bag due to the back-and-forth deformation of the star-shaped self-restoring cage frame when the star-shaped self-restoring cage frame is directly connected to the main filter bag.

[0018] (4) The lower end of the main filter bag is also fixedly connected to a bottom reinforced filter bag, and the bottom reinforced filter bag is connected to the main filter bag. The inner wall of the bottom reinforced filter bag is fixedly connected to a star-shaped dust filter speed reduction cage frame. An elastic anti-impact ring is placed in the middle of the star-shaped dust filter speed reduction cage frame, and the elastic anti-impact ring is in contact with each obtuse corner of the star-shaped dust filter speed reduction cage frame. A positioning slide rod is fixedly connected to each obtuse corner of the star-shaped dust filter speed reduction cage frame, and the positioning slide rod passes through the elastic anti-impact ring and is slidably connected to it. The bottom reinforced filter bag is located at the lower end close to the air inlet of the dust collector. Since the dust velocity at the air inlet is high and directly impacts the filter bag, a star-shaped dust filter speed reduction is set inside the bottom reinforced filter bag. The star-shaped dust filter speed reduction cage frame and the elastic anti-impact ring are used to offset the impact of the elastic anti-impact ring on the star-shaped dust filter speed reduction cage frame to effectively improve the impact resistance of the bottom enhanced filter bag, thereby preventing the bottom enhanced filter bag from being perforated by the long-term impact of dust. Moreover, since the star-shaped dust filter speed reduction cage frame also has a dust filtering effect, the resistance formed by the two dust filtering effects is used to effectively reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the wear of the bottom enhanced filter bag and increasing the service life of the filter bag. By connecting the positioning slide bar to the star-shaped dust filter speed reduction cage frame, the positioning slide bar telescopes and slides back and forth on the elastic anti-impact ring before and after the bottom enhanced filter bag expands, thereby fixing the elastic anti-impact ring.

[0019] (5) The star-shaped dust filter speed reduction cage frame includes multiple porous dust filter plates. Two adjacent porous dust filter plates are fixedly connected at the acute corner with a high temperature resistant connection angle 1, and two adjacent porous dust filter plates are fixedly connected at the obtuse corner with a high temperature resistant connection angle 2. The star-shaped dust filter speed reduction cage frame has the same function as the star-shaped self-recovering cage frame, which is to allow the bottom enhanced filter bag to reset after expansion. However, the porous dust filter plate is different from the solid lightweight bone rod. The solid lightweight bone rod is used to connect the star-shaped self-recovering cage frame with the main filter bag, while the porous dust filter plate not only plays a connecting role, but also uses its own dust filtering resistance to effectively reduce the air flow velocity passing through the bottom enhanced filter bag, thereby effectively reducing the wear degree of the bottom enhanced filter bag, thereby effectively avoiding the local perforation of the bottom enhanced filter bag during long-term use, and improving the service life of the bottom enhanced filter bag.

[0020] (6) The porous dust filter plate is made of wear-resistant material, and the high-temperature resistant connecting corners 1 and 2 are both made of high-temperature resistant elastic materials. The gas first passes through the bottom enhanced filter bag and then passes through the porous dust filter plate. In this way, the dust has been filtered twice, effectively improving the dust filtering effect at the bottom of the filter bag. The resistance formed by the dust filtering effect of the porous dust filter plate can also effectively protect the bottom enhanced filter bag from excessive wear by dust. Since the dust temperature at the air inlet is high, the high-temperature resistant connecting corners 1 and 2 are both made of high-temperature resistant materials to prevent the elastic force from failing.

[0021] (7) The outer surfaces of the main filter bag and the bottom reinforced filter bag are coated with a fireproof layer, and the bottom of the bottom reinforced filter bag is made of a flexible, airtight material. In order to prevent dust with sparks from burning the main filter bag and the bottom reinforced filter bag, both are coated with a fireproof layer on their outer surfaces. Kaolin is preferably used for the fireproof layer. The bottom of the bottom reinforced filter bag is mainly used for connection and closure, so a flexible, airtight material is used.

[0022] (8) The air permeability of the star-shaped dust filter speed reduction cage frame is better than that of the bottom enhanced filter bag, and the height of the star-shaped dust filter speed reduction cage frame is equal to the height of the bottom enhanced filter bag. The star-shaped dust filter speed reduction cage frame allows the bottom enhanced filter bag to expand and deform while also playing a filtering role. The dust will pass through two internal and external filtrations, effectively improving the dust filtering effect. Moreover, since the bottom enhanced filter bag is close to the bottom air inlet, the air flow speed here is large. The resistance formed by the star-shaped dust filter speed reduction cage frame during dust filtering can effectively reduce the speed of the air flow passing through the bottom enhanced filter bag, thereby effectively reducing the wear of the bottom enhanced filter bag, thereby increasing the service life. In order to allow the star-shaped dust filter speed reduction cage frame to fully contact the bottom enhanced filter bag, the height of the star-shaped dust filter speed reduction cage frame is equal to the height of the bottom enhanced filter bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the installation position of the main filter bag of the present invention;

[0024] Figure 2 It is a schematic diagram of the arrangement of the main filter bags of the present invention;

[0025] Figure 3 It is an overall three-dimensional diagram of the main filter bag of the present invention;

[0026] Figure 4 It is a position relationship diagram of the main filter bag and the bottom enhanced filter bag of the present invention;

[0027] Figure 5 It is a three-dimensional diagram of the main filter bag after expansion of the present invention;

[0028] Figure 6 A three-dimensional diagram of the star-shaped self-recovering cage frame of the present invention;

[0029] Figure 7 This is a diagram showing the shape change of the star-shaped self-recovering cage frame before and after expansion of the present invention;

[0030] Figure 8 It is a partial cross-sectional view of the star-shaped self-recovering cage frame of the present invention;

[0031] Fig. 9 It is a positional relationship diagram of the star-shaped self-restoring cage frame and the protective gasket of the present invention;

[0032] Fig.10 A three-dimensional diagram of the star-shaped dust filtering and speed reducing cage frame of the present invention;

[0033] Fig.11 It is a top view of the star-shaped dust filtering and speed reducing cage frame of the present invention.

[0034] Description of the numbers in the figure:

[0035] 1 Bag filter body, 2 Bag mounting frame body, 3 Main filter bag, 4 Star-shaped self-recovering cage frame, 401 Solid lightweight frame rod, 402 Self-recovering connection angle 1, 4021 Outer wrapping layer, 4022 Inner embedded layer, 403 Self-recovering connection angle 2, 5 Bottom enhanced filter bag, 6 Star-shaped dust filter speed reduction cage frame, 601 Porous dust filter plate, 602 High temperature resistant connection angle 1, 603 High temperature resistant connection angle 2, 7 Elastic impact-resistant ring, 8 Positioning slide rod, 9 Protective gasket, 10 Connection cage. DETAILED DESCRIPTION

[0036] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] An exhaust gas treatment device for a biomass gasifier, see Figure 1 , 2 and Fig. 9 , comprising a bag filter body 1, a bag filter body 2 is fixedly connected to the inner wall of the upper end of the bag filter body 1, and a plurality of main filter bags 3 (preferably made of polyester fiber, and other materials can also be selected according to actual needs) are inserted on the bag filter body 2 and are evenly spaced. A connecting cage 10 is fixedly connected to the upper opening of the main filter bag 3, and a star-shaped through-hole connected to the inside of the main filter bag 3 is opened in the middle of the connecting cage 10, and a plurality of star-shaped self-closing holes equidistantly distributed up and down are fixedly connected to the inner wall of the main filter bag 3. The restorable cage frame 4 (the shape of the star-shaped self-restoring cage frame 4 is preferably a five-pointed star shape, and other polygonal star shapes can also be selected), a protective gasket 9 is also fixedly connected between the star-shaped self-restoring cage frame 4 and the inner wall of the main filter bag 3, and the protective gasket 9 is made of high-temperature resistant silicone material, and the protective gasket 9 plays a protective role between the star-shaped self-restoring cage frame 4 and the main filter bag 3, so as to avoid the main filter bag 3 from being damaged due to the back-and-forth deformation of the star-shaped self-restoring cage frame 4 when the star-shaped self-restoring cage frame 4 is directly connected to the main filter bag 3;

[0039] See also Figure 6 , 7 and Figure 8The star-shaped self-recovering cage frame 4 includes a plurality of solid lightweight bone rods 401 (preferably made of high-temperature resistant plastic material, and other materials can also be selected according to actual needs), two adjacent solid lightweight bone rods 401 are fixedly connected at the obtuse corner with a self-recovering connection angle 1 402, and two adjacent solid lightweight bone rods 401 are fixedly connected at the acute corner with a self-recovering connection angle 2 403, the self-recovering connection angle 1 402 and the self-recovering connection angle 2 403 have the same structure, the self-recovering connection angle 1 402 includes an outer wrapping layer 4021 (preferably made of rubber material, and other materials can also be selected according to actual needs), and The inner wall of the outer wrapping layer 4021 is fixedly inlaid with an embedded layer 4022 (polyurethane elastic material is preferably used, and other materials can also be selected according to actual needs). The self-recovering connection angle 1 402 and the self-recovering connection angle 2 403 serve to connect the solid lightweight bone rod 401, and after the star-shaped self-recovering cage frame 4 is instantly expanded due to pulse blowing, the star-shaped self-recovering cage frame 4 can be quickly reset by utilizing the recovery elastic force. The outer wrapping layer 4021 and the embedded layer 4022 both have good elastic force, wherein the outer wrapping layer 4021 serves as an auxiliary elastic force, and the embedded layer 4022 serves as the main elastic force.

[0040] Embodiment 2:

[0041] Based on Example 1, please refer to Figure 3 , 4 and Figure 5 , the lower end of the main filter bag 3 is also fixedly connected with a bottom reinforced filter bag 5 (PTFE material is preferably selected, and other materials can also be selected according to actual needs), the outer surfaces of the main filter bag 3 and the bottom reinforced filter bag 5 are coated with a fireproof layer, and the bottom of the bottom reinforced filter bag 5 is made of a flexible airtight material (high temperature resistant rubber material is preferably selected, and other materials can also be selected according to actual needs), the bottom of the bottom reinforced filter bag 5 is the same as the bottom reinforced filter bag 5 in shape, but the area is larger than the area of ​​the bottom reinforced filter bag 5 after deformation, which does not affect the expansion of the bottom reinforced filter bag 5, in order to prevent the dust with sparks from burning the main filter bag 3 and the bottom reinforced filter bag 5, the outer surfaces of both are coated with a fireproof layer, and the fireproof layer is preferably kaolin, the bottom of the bottom reinforced filter bag 5 mainly realizes the function of connection and closure, so a flexible airtight material is used;

[0042] See also Figure 3 , 4 and Fig.10, and the bottom enhanced filter bag 5 is connected to the main filter bag 3, and the inner wall of the bottom enhanced filter bag 5 is fixedly connected with a star-shaped dust filter speed reduction cage bone 6, the air permeability of the star-shaped dust filter speed reduction cage bone 6 is better than that of the bottom enhanced filter bag 5, and the height of the star-shaped dust filter speed reduction cage bone 6 is equal to the height of the bottom enhanced filter bag 5, the star-shaped dust filter speed reduction cage bone 6 allows the bottom enhanced filter bag 5 to achieve expansion and deformation while also playing a filtering role, the dust will be filtered through both the inside and the outside, effectively improving the dust filtering effect, and because the bottom enhanced filter bag 5 is close to the bottom air inlet, the air flow speed here is large, and the resistance formed by the star-shaped dust filter speed reduction cage bone 6 during dust filtering can effectively reduce the speed of the air flow passing through the bottom enhanced filter bag 5, thereby effectively reducing the wear of the bottom enhanced filter bag 5, thereby improving the service life, in order to allow the star-shaped dust filter speed reduction cage bone 6 to fully contact with the bottom enhanced filter bag 5, the height of the star-shaped dust filter speed reduction cage bone 6 is equal to the height of the bottom enhanced filter bag 5;

[0043] See also Fig.10 , 11 The star-shaped dust filter speed reduction cage frame 6 includes a plurality of porous dust filter plates 601, and two adjacent porous dust filter plates 601 are fixedly connected at the acute corners with a high temperature resistant connection corner 1 602, and two adjacent porous dust filter plates 601 are fixedly connected at the obtuse corners with a high temperature resistant connection corner 2 603. The star-shaped dust filter speed reduction cage frame 6 has the same function as the star-shaped self-recovering cage frame 4, which is to allow the bottom enhanced filter bag 5 to reset after expansion, but the porous dust filter plate 601 is different from the solid lightweight bone rod 401. The function of the solid lightweight bone rod 401 is to connect the star-shaped self-recovering cage frame 4 with the main filter bag 3, and the porous dust filter plate 601 not only plays a connecting role, but also uses its own dust filtering resistance to effectively reduce the air flow velocity passing through the bottom enhanced filter bag 5, thereby effectively reducing the degree of wear of the bottom enhanced filter bag 5, thereby In order to effectively avoid the situation where the bottom enhanced filter bag 5 is partially perforated during long-term use, and to increase the service life of the bottom enhanced filter bag 5, the porous dust filter plate 601 is made of wear-resistant material (polyurethane material is preferred, and other materials can also be selected according to actual needs), and the high temperature resistant connecting corner 1 602 and the high temperature resistant connecting corner 2 603 are both made of high temperature resistant elastic material. The gas first passes through the bottom enhanced filter bag 5 and then passes through the porous dust filter plate 601. In this way, the dust is filtered twice, which effectively improves the dust filtering effect at the bottom of the filter bag. The resistance formed by the dust filtering effect of the porous dust filter plate 601 can also effectively protect the bottom enhanced filter bag 5 from excessive wear of dust. Since the dust temperature at the air inlet is high, the high temperature resistant connecting corner 1 602 and the high temperature resistant connecting corner 2 603 are both made of high temperature resistant material to avoid elastic failure.

[0044] See also Fig.10 , 11An elastic anti-impact ring 7 is placed in the middle of the star-shaped dust filter speed reduction cage frame 6, and the elastic anti-impact ring 7 is attached to each obtuse corner of the star-shaped dust filter speed reduction cage frame 6. A positioning slide bar 8 is fixedly connected to each obtuse corner of the star-shaped dust filter speed reduction cage frame 6, and the positioning slide bar 8 penetrates the elastic anti-impact ring 7 and is slidably connected thereto. The bottom enhanced filter bag 5 is located at the lower end near the air inlet of the dust collector. Since the dust speed at the air inlet is high and directly impacts the filter bag, a star-shaped dust filter speed reduction cage frame 6 and an elastic anti-impact ring 7 are arranged inside the bottom enhanced filter bag 5. The elastic anti-impact ring 7 is used to 6 can effectively improve the impact resistance of the bottom enhanced filter bag 5, avoid the bottom enhanced filter bag 5 being perforated by the long-term impact of dust, and because the star-shaped dust filtering and speed reduction cage frame 6 also has a dust filtering effect, the resistance formed by the two dust filtering effects is used to effectively reduce the air flow speed passing through the bottom enhanced filter bag 5, thereby effectively reducing the wear of the bottom enhanced filter bag 5 and increasing the service life of the filter bag. By connecting the positioning slide bar 8 to the star-shaped dust filtering and speed reduction cage frame 6, the positioning slide bar 8 can be telescoped and slid back and forth on the elastic anti-impact ring 7 before and after the bottom enhanced filter bag 5 expands, thereby fixing the elastic anti-impact ring 7.

[0045] The working principle of this scheme is as follows: before the pulse cleaning system of the bag filter body 1 is started, the main filter bag 3 and the bottom enhanced filter bag 5 perform normal dust filtering work. Since the bottom enhanced filter bag 5 is close to the air inlet, the dust impact force here is large, and the dust directly impacts the bottom enhanced filter bag 5. At this time, the star-shaped dust filter speed reduction cage frame 6 and the elastic anti-impact ring 7 offset each other. When the bottom enhanced filter bag 5 is impacted, the elastic anti-impact ring 7 relies on its own elasticity to absorb the impact force on the bottom enhanced filter bag 5, thereby effectively improving the impact resistance of the bottom enhanced filter bag 5. In addition, the star-shaped dust filter speed reduction cage frame 6 also plays a dust filtering role. In this way, the resistance formed by the star-shaped dust filter speed reduction cage frame 6 due to dust filtering will effectively reduce the speed of the airflow when it passes through the bottom enhanced filter bag 5. Thereby, the wear of the bottom enhanced filter bag 5 by the airflow is effectively reduced, thereby extending its service life. When the pulse spray system of the bag collector body 1 is started, the gas blown into the main filter bag 3 by the pulse valve causes the main filter bag 3 and the bottom enhanced filter bag 5 to expand instantly. During the expansion, the star-shaped self-recovering cage frame 4 and the star-shaped dust filter speed reduction cage frame 6 are deformed from a star shape to a shape close to a circle, so that the main filter bag 3 and the bottom enhanced filter bag 5 undergo obvious shape changes front and back, thereby effectively improving the cleaning effect of the filter bag, especially improving the effect of removing compacted dust. Then, the star-shaped self-recovering cage frame 4 and the star-shaped dust filter speed reduction cage frame 6 allow the main filter bag 3 and the bottom enhanced filter bag 5 to recover their deformation under their own recovery elastic force, thus realizing self-cleaning by utilizing the vibration effect of the front and rear deformation.

[0046] The above description is only the best implementation mode adopted by the present invention in combination with current practical needs, but the protection scope of the present invention is not limited thereto.

Claims

1. A waste gas treatment device for a biomass gasifier, comprising a bag filter body (1), characterized in that: The upper inner wall of the bag filter body (1) is fixedly connected to a bag mounting frame body (2), and a plurality of main filter bags (3) are inserted on the bag mounting frame body (2) at equal intervals. The upper opening of the main filter bag (3) is fixedly connected to a connecting cage (10), and a star-shaped through-hole communicating with the interior of the main filter bag (3) is opened in the middle of the connecting cage (10). The inner wall of the main filter bag (3) is fixedly connected to a plurality of star-shaped self-recovering cage frames (4) at equal intervals above and below. The star-shaped self-recovering cage frames (4) include a plurality of solid lightweight frame rods (401), two adjacent solid lightweight frame rods (401) are fixedly connected at an obtuse corner with a self-recovering connection angle 1 (402), and two adjacent solid lightweight frame rods (401) are fixedly connected at an acute corner with a self-recovering connection angle 2 (403); The lower end of the main filter bag (3) is also fixedly connected to a bottom reinforced filter bag (5), and the bottom reinforced filter bag (5) is in communication with the main filter bag (3). The outer surfaces of the main filter bag (3) and the bottom reinforced filter bag (5) are coated with a fireproof layer, and the bottom of the bottom reinforced filter bag (5) is made of a flexible airtight material. The inner wall of the bottom reinforced filter bag (5) is fixedly connected to a star-shaped dust filter speed reduction cage frame (6), and the air permeability of the star-shaped dust filter speed reduction cage frame (6) is better than that of the bottom reinforced filter bag (5). The invention discloses a star-shaped dust filter speed reduction cage frame (6) having a height that is equal to the height of the bottom reinforced filter bag (5); an elastic anti-impact ring (7) is placed in the middle of the star-shaped dust filter speed reduction cage frame (6); the elastic anti-impact ring (7) is in contact with each obtuse corner of the star-shaped dust filter speed reduction cage frame (6); each obtuse corner of the star-shaped dust filter speed reduction cage frame (6) is fixedly connected with a positioning slide rod (8); the positioning slide rod (8) passes through the elastic anti-impact ring (7) and is slidably connected thereto.

2. The waste gas treatment device for a biomass gasifier according to claim 1, characterized in that: The self-recovering connection angle 1 (402) and the self-recovering connection angle 2 (403) have the same structure. The self-recovering connection angle 1 (402) includes an outer wrapping layer (4021), and the inner wall of the outer wrapping layer (4021) is fixedly inlaid with an inner embedding layer (4022).

3. The waste gas treatment device for a biomass gasifier according to claim 1, characterized in that: A protective gasket (9) is also fixedly connected between the star-shaped self-restoring cage frame (4) and the inner wall of the main filter bag (3), and the protective gasket (9) is made of high-temperature resistant silica gel material.

4. The waste gas treatment device for a biomass gasifier according to claim 1, characterized in that: The star-shaped dust filter speed reduction cage frame (6) comprises a plurality of porous dust filter plates (601), two adjacent porous dust filter plates (601) being fixedly connected at an acute corner with a first high temperature resistant connection corner (602), and two adjacent porous dust filter plates (601) being fixedly connected at an obtuse corner with a second high temperature resistant connection corner (603).

5. The waste gas treatment device for a biomass gasifier according to claim 4, characterized in that: The porous dust filter plate (601) is made of a wear-resistant material, and the high-temperature resistant connecting corner 1 (602) and the high-temperature resistant connecting corner 2 (603) are both made of a high-temperature resistant elastic material.

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