Middle gas outlet structure of downdraft biomass gasifier

Abstract

The utility model discloses a middle gas outlet structure of a downdraft biomass gasifier, which comprises a V-shaped gas pipe, a dust outlet pipe is arranged at the lowest point of the V-shaped gas pipe, a plurality of sealing plates are arranged on the dust outlet pipe, and pressing plates are symmetrically and movably arranged in the V-shaped gas pipe. According to the middle gas outlet structure of the downdraft biomass gasification furnace, gas flows out of the middle of the biomass gasification furnace and then enters the V-shaped gas pipe, part of plant ash in the gas is accumulated at the lowest position of the V-shaped gas pipe under the action of gravity, and at the moment, the dust outlet pipe is sealed by the sealing plate; then, two pressing plates move downwards and abut against the inner wall of the V-shaped air pipe, the pressing plates continue to move downwards, the two pressing plates are gradually inserted and push the plant ash in the V-shaped air pipe to be close to the dust outlet pipe, and then a sealing plate is opened; plant ash in the V-shaped gas pipe can enter the dust outlet pipe, so that the content of the plant ash in the gas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of biomass gasifiers, in particular to a middle gas outlet structure of a downdraft biomass gasifier. Background Art

[0002] A biomass gasifier is a device that uses crop straw, forest waste, edible fungus residue, cattle and sheep manure and all combustible materials to produce plant gas. The combustible materials it uses are all renewable, and the plant gas it produces is also a clean energy source.

[0003] According to the publication (announcement) number CN110499191B, the publication (announcement) date is 2020.10.02, which discloses a downdraft biomass gasifier with central gas outlet, comprising: a feed hopper, an air lock, an upper furnace body, a material limiter, a middle furnace body, a rotating grate, a lower furnace body, and a slag discharger; the feed hopper is arranged above the air lock, and is used for temporarily loading and controlling the entry of biomass raw materials into the furnace body; the air lock is arranged on the outer top of the upper furnace body, and is used to isolate the interior of the furnace body from the outside air, and prevent a large amount of air from entering the furnace body and causing a gas explosion; in the present invention, a mixture of high-temperature flue gas and hot air is used as a gasifying agent, and a small amount of air entering the furnace body will not affect the stability of the operation, so in actual use, a conventional star-shaped dropper can be selected as an air lock. The device uses a mixture of high-temperature flue gas and hot air as a gasifying agent, which accelerates the drying and carbonization speed of biomass raw materials and improves the low heat conversion efficiency. By discharging gas from the center of the furnace, the present invention avoids burning the lower grate system, a common problem in downdraft gasifiers, and thus extends the service life of the rotary grate. The unique furnace structure design creates four lateral combustion and gasification zones in the center of the furnace, effectively preventing the hollow and uneven burning problems common in existing downdraft gasifiers. This invention offers substantial advantages and significant advancements over existing technologies.

[0004] In the prior art including the above-mentioned patent, in the process of using straw to generate plant gas, the burning of straw will produce a lot of light wood ash, which can easily move with the air flow, thereby affecting the quality of the plant gas. At the same time, a large amount of flying wood ash will also endanger people's health. Utility Model Content

[0005] The purpose of the utility model is to provide a middle gas outlet structure of a downdraft biomass gasifier, aiming to solve the above problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a middle air outlet structure of a downdraft biomass gasifier, including a V-shaped air pipe, a dust outlet pipe is provided at the lowest point of the V-shaped air pipe, a plurality of sealing plates are provided on the dust outlet pipe, and a pressure plate is symmetrically and movably provided in the V-shaped air pipe, the two pressure plates move and gradually insert to open the sealing plate, and the pressure plate presses the dust in the V-shaped air pipe to move into the dust outlet pipe.

[0007] Preferably, the pressure plate includes a connecting rod slidably mounted in the V-shaped air pipe and pressure rods fixedly mounted on the connecting rod and distributed in a linear array.

[0008] Preferably, the plurality of pressure rods on the two pressure plates are staggeredly distributed.

[0009] Preferably, the connecting rod and the pressure rod are both provided with liquid outlet pipes distributed in a linear array.

[0010] Preferably, the V-shaped air pipe is symmetrically provided with inclined guide grooves for guiding the movement of the connecting rod.

[0011] Preferably, a movable frame for pushing the connecting rod to move is slidably provided in the V-shaped air pipe.

[0012] Preferably, an electric telescopic rod is provided between the movable frame and the V-shaped air tube.

[0013] Preferably, the connecting rod is provided with a square limiting block adapted to the movable frame.

[0014] Preferably, the sealing plate is provided with a paddle extending into the interior of the V-shaped air pipe.

[0015] Preferably, the movable frame is provided with push rods corresponding one-to-one to the plurality of paddles.

[0016] In the above technical scheme, the utility model provides a middle gas outlet structure of a downdraft biomass gasifier, which has the following beneficial effects: after the gas flows out from the middle of the biomass gasifier, it will enter the V-shaped air pipe, and part of the wood ash in the gas will accumulate at the lowest point of the V-shaped air pipe under the action of gravity. At this time, the sealing plate will close the dust outlet pipe to prevent the air flow from entering the dust outlet pipe and disturbing the wood ash in the dust outlet pipe. Then the two pressure plates move downward, and the two pressure plates rest on the inner wall of the V-shaped air pipe. The pressure plates continue to move downward, and the two pressure plates gradually insert and push the wood ash in the V-shaped air pipe closer to the dust outlet pipe. Then the sealing plate is opened, and the wood ash in the V-shaped air pipe can enter the dust outlet pipe, reducing the content of wood ash in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the internal structure provided by an embodiment of the present utility model;

[0020] Figure 3 A schematic structural diagram of a pressure plate provided in an embodiment of the present utility model;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0023] Description of reference numerals:

[0024] 1. V-shaped air pipe; 11. Dust outlet pipe; 111. Sealing plate; 112. Pick; 12. Pressing plate; 121. Connecting rod; 122. Pressing rod; 123. Liquid outlet; 124. Liquid infusion tube; 125. Limiting block; 13. Movable frame; 131. Electric telescopic rod; 132. Push rod; 14. Guide groove. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-5 As shown, a middle air outlet structure of a downdraft biomass gasifier includes a V-shaped air pipe 1, a dust outlet pipe 11 is provided at the lowest point of the V-shaped air pipe 1, a plurality of sealing plates 111 are provided on the dust outlet pipe 11, and pressure plates 12 are symmetrically and movably provided in the V-shaped air pipe 1. The two pressure plates 12 move and gradually insert to open the sealing plates 111, and the pressure plates 12 press the dust in the V-shaped air pipe 1 to move it into the dust outlet pipe 11.

[0027] Specifically, after the gas flows out from the middle of the biomass gasification furnace, it will enter the V-shaped air pipe 1. Part of the wood ash in the gas will accumulate at the lowest point of the V-shaped air pipe 1 under the action of gravity. At this time, the sealing plate 111 will close the dust outlet pipe 11 to prevent the airflow from entering the dust outlet pipe 11 and disturbing the wood ash in the dust outlet pipe 11. Then the two pressure plates 12 move downward, and the two pressure plates 12 rest on the inner wall of the V-shaped air pipe 1. The pressure plate 12 continues to move downward, and the two pressure plates 12 gradually insert and push the wood ash in the V-shaped air pipe 1 closer to the dust outlet pipe 11. Then the sealing plate 111 is opened, and the wood ash in the V-shaped air pipe 1 can enter the dust outlet pipe 11, reducing the content of wood ash in the gas.

[0028] In the above technical solution, after the gas flows out from the middle of the biomass gasification furnace, it will enter the V-shaped air pipe 1. Part of the wood ash in the gas will accumulate at the lowest point of the V-shaped air pipe 1 under the action of gravity. At this time, the sealing plate 111 will close the dust outlet pipe 11 to prevent the air flow from entering the dust outlet pipe 11 and disturbing the wood ash in the dust outlet pipe 11. Then the two pressure plates 12 move downward, and the two pressure plates 12 rest on the inner wall of the V-shaped air pipe 1. The pressure plate 12 continues to move downward, and the two pressure plates 12 gradually insert and push the wood ash in the V-shaped air pipe 1 closer to the dust outlet pipe 11. Then the sealing plate 111 is opened, and the wood ash in the V-shaped air pipe 1 can enter the dust outlet pipe 11, reducing the content of wood ash in the gas.

[0029] As an embodiment further provided by the present invention, the pressing plate 12 includes a connecting rod 121 slidably installed in the V-shaped air pipe 1 and a pressing rod 122 fixedly installed on the connecting rod 121 and distributed in a linear array. The multiple pressing rods 122 on the two pressing plates 12 are staggered, and the connecting rod 121 and the pressing rod 122 are provided with liquid outlet holes 123 distributed in a linear array. The V-shaped air pipe 1 is symmetrically provided with inclined guide grooves 14 for guiding the movement of the connecting rod 121. The connecting rod 121 is provided with a liquid infusion pipe 124 connected to the water pump; after the gas flows out from the middle of the biomass gasification furnace, it will enter the V-shaped air pipe 1, and part of the wood ash in the gas will accumulate at the lowest point of the V-shaped air pipe 1 under the action of gravity. At this time, the sealing plate 111 closes the dust outlet pipe 11 to prevent the airflow from entering the dust outlet pipe 11 and disturbing the wood ash in the dust outlet pipe 11. Then the electric telescopic rod 131 The push rod 132 on the movable frame 13 pushes the paddle 112, and the paddle 112 drives the sealing plate 111 to rotate, opening the dust outlet pipe 11, and the pressing plate 12 pushes the ash in the V-shaped air pipe 1 into the dust outlet pipe 11, reducing the content of ash in the gas.

[0030] As another embodiment further provided by the present invention, a movable frame 13 is slidingly provided in the V-shaped air pipe 1 for pushing the connecting rod 121 to move, an electric telescopic rod 131 is provided between the movable frame 13 and the V-shaped air pipe 1, a square limit block 125 adapted to the movable frame 13 is provided on the connecting rod 121, a paddle 112 extending to the inside of the V-shaped air pipe 1 is provided on the sealing plate 111, a push rod 132 corresponding to multiple paddles 112 is provided on the movable frame 13, and a torsion spring is provided between the sealing plate 111 and the V-shaped air pipe 1; after the gas flows out from the middle of the biomass gasification furnace, it will enter the V-shaped air pipe 1, and part of the wood ash in the gas will accumulate at the lowest point of the V-shaped air pipe 1 under the action of gravity. At this time, the sealing plate 111 closes the dust outlet pipe 11 to prevent the airflow from entering the dust outlet pipe 11 and disturbing the wood ash in the dust outlet pipe 11, and then the electric telescopic rod 13 1 extends, pushing the movable frame 13 to move downward, and the movable frame 13 pushes the limit block 125 to move the two pressure plates 12 downward. The pressure plate 12 moves under the guidance of the inclined guide groove 14, and the limit block 125 moves in the movable frame 13. The two pressure plates 12 rest on the inner wall of the V-shaped air pipe 1, scraping off the ash on the inner wall of the V-shaped air pipe 1, and the pressure plate 12 continues to move downward. The water pump injects water into the pressure plate 12 through the infusion pipe 124, and the water is discharged from the liquid outlet 123. The moisture moistens the ash and bonds the ash together to prevent the ash from being crushed and further dissipated under pressure. The pressure plate 12 continues to move downward and gradually engages. The push rod 132 on the movable frame 13 pushes the paddle 112, and the paddle 112 drives the sealing plate 111 to rotate, opening the dust outlet pipe 11, and the pressure plate 12 pushes the ash in the V-shaped air pipe 1 into the dust outlet pipe 11, reducing the content of ash in the gas.

[0031] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A middle gas outlet structure of a downdraft biomass gasifier, characterized in that: The invention comprises a V-shaped air pipe (1), wherein a dust outlet pipe (11) is provided at the lowest point of the V-shaped air pipe (1), a plurality of sealing plates (111) are provided on the dust outlet pipe (11), and a pressure plate (12) is symmetrically and movably provided in the V-shaped air pipe (1), wherein two pressure plates (12) move and gradually engage to open the sealing plates (111), and the pressure plates (12) press the dust in the V-shaped air pipe (1) to move into the dust outlet pipe (11).

2. The middle gas outlet structure of the downdraft biomass gasifier according to claim 1, characterized in that: The pressing plate (12) comprises a connecting rod (121) slidably mounted in the V-shaped air pipe (1) and pressing rods (122) fixedly mounted on the connecting rod (121) and distributed in a linear array.

3. The middle gas outlet structure of the downdraft biomass gasifier according to claim 2, characterized in that: The plurality of pressure rods (122) on the two pressure plates (12) are distributed in a staggered manner.

4. The middle gas outlet structure of the downdraft biomass gasifier according to claim 3, characterized in that: The connecting rod (121) and the pressing rod (122) are both provided with liquid outlet holes (123) distributed in a linear array.

5. The middle gas outlet structure of the downdraft biomass gasifier according to claim 4, characterized in that: The V-shaped air pipe (1) is symmetrically provided with inclined guide grooves (14) for guiding the movement of the connecting rod (121).

6. The middle gas outlet structure of the downdraft biomass gasifier according to claim 5, characterized in that: A movable frame (13) is slidably provided in the V-shaped air tube (1) for pushing the connecting rod (121) to move.

7. The middle gas outlet structure of the downdraft biomass gasifier according to claim 6, characterized in that: An electric telescopic rod (131) is provided between the movable frame (13) and the V-shaped air tube (1).

8. The middle gas outlet structure of the downdraft biomass gasifier according to claim 7, characterized in that: The connecting rod (121) is provided with a square limiting block (125) adapted to the movable frame (13).

9. The middle gas outlet structure of the downdraft biomass gasifier according to claim 8, characterized in that: The sealing plate (111) is provided with a paddle (112) extending into the interior of the V-shaped air pipe (1).

10. The middle gas outlet structure of the downdraft biomass gasifier according to claim 9, characterized in that: The movable frame (13) is provided with push rods (132) corresponding one-to-one to the plurality of paddles (112).

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