Biomass gasifier with automatic decoking function

Abstract

An automatic decoking biomass gasifier comprises a base support, a main tank body, an air inlet system and a coke discharging system, the coke discharging system comprises a discharging hopper and a hopper driving device, the discharging hopper comprises an outer hopper with a downward closing opening and a cylindrical inner hopper, the outer hopper coaxially surrounds the lower portion of the main tank body, and the inner hopper is coaxially fixed to the bottom of the outer hopper; the hopper driving device is connected with the discharging hopper and drives the discharging hopper to rotate in the axial direction. The air inlet system comprises an air bellow, an air inlet furnace plate and an air supply ring; the air inlet furnace plate is installed at the top of the inner hopper, a gap is formed between the air inlet furnace plate and the inner wall of the main tank body, the diameter of the air inlet furnace plate is decreased in the axial direction of the main tank body from bottom to top, a plurality of air outlets are formed in the side face of the air inlet furnace plate in the height direction, and the air outlets located at the same height tangentially discharge air in the same direction of the circumference; the air supply ring is fixedly connected to the inner wall of the middle of the main tank. According to the embodiment of the invention, the contact area between fuel and furnace slag and inlet air is increased, and the fuel obtains sufficient gasification conditions for cracking.

Description

Technical Field

[0001] The utility model relates to the technical field of gasifiers, in particular to an automatic coke-cleaning biomass gasifier. Background Art

[0002] With the development of the global economy, the international community's demand for energy continues to grow, while the use of traditional energy has brought serious environmental problems. The development of efficient and clean energy conversion technology has become a top priority. Among them, gasification technology that converts solid fuels into combustible gases is widely used in actual production and life because of its advantages of high energy utilization and reduced pollutant emissions.

[0003] The biomass gasifier is a device that converts solid fuel into combustible gas, including a main tank body, an air intake system, and a coke discharge system. Among them, the air intake system includes a furnace plate arranged at the bottom of the inner side of the main tank body and air inlets distributed on the furnace plate. The air intake structure of the furnace plate plays a key role in the efficiency and quality of the gasification reaction. In the flat-plate gasifier of the related technology, the furnace plate is arranged as a plane structure, and air inlets are distributed on the furnace plate. The slag is in contact with the plane of the furnace plate. The furnace plate cannot effectively and evenly introduce air into the reaction area, and the contact area between the fuel or slag and the slag discharge device is small, which makes the fuel difficult to crack or crack insufficiently, resulting in incomplete combustion of the local fuel and the generation of a large amount of unreacted substances.

[0004] In the above technical solution, there are defects in the layout of the air inlet system and the slag discharge structure, which further lead to problems such as small air inlet contact area, insufficient gasification reaction conditions, slag easily causing pipeline blockage, flue gas pollution and emissions; it not only reduces the utilization efficiency of the equipment, increases the cost of subsequent inspection and maintenance, but also generates additional environmental treatment costs. Utility Model Content

[0005] In order to solve at least one of the problems mentioned in the background technology, an embodiment of the present application provides an automatic coke-cleaning biomass gasification furnace. By setting a furnace plate with a variable height, an air outlet for forward and tangential air outlet, and a furnace plate driving device, the air outlet of the air inlet furnace plate forms a swirl wind inside the main tank body, thereby increasing the contact area between the fuel and slag and the air inlet furnace plate, and also increasing the contact area between the fuel and slag and the air inlet. The fuel obtains sufficient gasification conditions for cracking, avoiding large-scale slagging. The slag automatically falls into the gap between the furnace plate and the main tank body with the swirl wind, and then falls into the discharge hopper, preventing problems such as insufficient reaction, slagging blockage, flue gas pollution and exhaust, thereby improving the utilization efficiency of the equipment, reducing the inspection and maintenance costs, and reducing the environmental treatment costs.

[0006] The embodiment of the present application provides an automatic coke-clearing biomass gasification furnace, comprising a base support, a main tank body, an air inlet system and a coke outlet system, wherein the main tank body is fixedly connected to the upper part of the base support, the upper part of the main tank body is a feed inlet, and the lower part of the main tank body is a coke outlet;

[0007] The coke discharge system includes a discharge hopper and a hopper driving device. The discharge hopper includes an outer hopper with a downwardly closed opening and a cylindrical inner hopper. The diameter of the bottom of the outer hopper is greater than or equal to the outer diameter of the main tank body. The outer hopper coaxially surrounds the lower part of the main tank body, and there is a gap between the bottom of the outer hopper and the bottom of the main tank body. The diameter of the inner hopper is smaller than the inner diameter of the main tank body. The inner hopper is coaxially fixed to the bottom of the outer hopper, and the top of the inner hopper extends into the main tank body. The hopper driving device is connected to the discharge hopper and drives the discharge hopper to rotate axially.

[0008] The air intake system includes a bellows, an air intake furnace plate and an air supply ring, the bellows being used to connect to a fan; the air intake furnace plate is installed on the top of the inner bucket, a gap is provided between the air intake furnace plate and the inner wall of the main tank body, the bottom of the air intake furnace plate is connected to the bellows through an air intake pipe, the diameter of the air intake furnace plate decreases along the axial direction of the main tank body from bottom to top, a plurality of air outlets are arranged on the side of the air intake furnace plate along the height direction, and the air outlets at the same height discharge air tangentially in the same direction along the circumference; the air supply ring is fixedly connected to the inner wall of the middle part of the main tank body, air supply holes are evenly distributed on the air supply ring, and the air supply ring is connected to the bellows through an air supply pipe.

[0009] In an achievable embodiment, the air inlet furnace plate includes a bottom plate and a plurality of discs, the bottom plate is connected to the top of the inner bucket, the plurality of discs are spaced from bottom to top along the axial direction of the main tank body, the diameters of the bottom plate and the plurality of discs decrease from bottom to top, the edges of the discs of each layer are bevel teeth uniformly distributed along the circumferential direction, the bevel teeth are connected to a support plate for support on one side facing the bottom plate, and the air outlet is formed between adjacent support plates of each layer of the discs;

[0010] The chassis, the disc located at the top layer and the discs of each layer between the chassis are respectively provided with a central vent hole, and the central vent hole on the chassis is connected to the bellows through the air inlet pipe.

[0011] In an achievable implementation, the number of the discs is 3 to 4 layers, the diameter of the central vent hole is 120 mm to 130 mm, and the difference between the diameter of the bottom plate and the outer diameter of the disc at the bottom layer is 20 mm to 25 mm;

[0012] And / or, each of the support plates is arranged outwardly and away from the center.

[0013] In a feasible embodiment, the main tank body includes an inner tank and an outer tank connected by a coaxial sleeve, a water cooling chamber is formed between the inner tank and the outer tank, the water cooling chamber is connected to a cold water inlet and a steam outlet, the steam outlet is connected to the air inlet pipe through a steam delivery pipe; the steam delivery pipe and the air supply pipe are respectively provided with control valves.

[0014] In a feasible embodiment, the decoking system further comprises a decoking guide plate, the upper portion of which is connected to the bottom of the outer wall of the main tank body and extends axially, and the lower portion of which is bent relative to the upper portion.

[0015] In a feasible implementation, the air supply ring is a half-cut annular ring located on the inner side after being cut along the circumferential midline of the annular ring, and the air supply ring is circumferentially welded to the inner wall of the main tank body.

[0016] In a feasible implementation, the air supply ring is provided with 3 to 4 layers of air supply holes, the diameter of the air supply holes located at the top and bottom layers is 5 mm to 6 mm, and the diameter of the air supply holes located at the middle layer is 8 mm to 9 mm.

[0017] In a feasible embodiment, the hopper driving device includes a motor, a turbine reducer and a driving gear, the driving gear is fixed to the bottom of the discharge hopper, a mounting platform is provided on the base bracket, the motor and the turbine reducer are mounted on the mounting platform, and the motor drives the turbine reducer to engage with the driving gear for transmission.

[0018] In an achievable embodiment, the base support comprises two vertically connected cross bars, the ends of each cross bar are respectively connected to a vertical bar, and the top of the vertical bar is connected to the main tank body through an oblique support rod;

[0019] One of the cross bars is a hollow tube, one end of which is connected to the bellows, a lower air inlet pipe extending upward is arranged in the middle of the hollow tube corresponding to the center of the air inlet furnace plate, an upper air inlet pipe extending downward is arranged in the center of the air inlet furnace plate, and a flange bearing is connected between the upper air inlet pipe and the lower air inlet pipe.

[0020] In a feasible embodiment, the main tank body is provided with a furnace door and a fire outlet, the furnace door is located at the lower part of the side of the main tank body close to the air inlet furnace plate, and the fire outlet is located at the top position of the side of the main tank body.

[0021] The automatic coke-cleaning biomass gasification furnace provided in the embodiment of the present application is provided with a hopper driving device to drive the discharge hopper to rotate axially; an air inlet furnace plate is provided at the top of the discharge hopper, and a gap is provided between the air inlet furnace plate and the main tank body, providing a channel for the slag to be discharged into the discharge hopper; the diameter of the air inlet furnace plate becomes smaller along the height direction, thereby increasing the contact area between the slag and the air inlet furnace plate, which is conducive to crushing the slag; the air inlet furnace plate forms an air outlet for forward and tangential air outlet along the height direction, so that the air outlet of the air inlet furnace plate forms a swirl wind inside the main tank body, thereby increasing the contact area between the fuel, the air inlet furnace plate and the air inlet, so that the fuel obtains sufficient gasification conditions for cracking, avoiding large-area slagging, and the slag automatically falls into the gap between the furnace plate and the main tank body with the swirl wind, and then falls into the discharge hopper; an air supply ring is provided in the middle of the main tank body to inlet air, thereby increasing the contact area between the fuel and the air inlet, making the reaction more complete.

[0022] The embodiment of the present application optimizes the coke removal system and air intake system of the biomass gasifier, realizes automatic cleaning of waste slag through an automatic coke cleaning discharge hopper, adopts an air supply ring to increase the air intake contact area, makes the reaction more complete, changes the gas flow direction, reduces flue gas emissions, and improves the efficiency of air intake utilization; optimizes the traditional furnace plate structure, adopts a direct discharge waste treatment structure, does not block the pipeline, and improves the utilization efficiency of equipment; improves the traditional furnace plate structure, and reduces the production and later maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a biomass gasifier with automatic coke removal provided in an embodiment of the present application;

[0025] Figure 2 A front view of the biomass gasifier with automatic coke removal provided in an embodiment of the present application;

[0026] Figure 3 for Figure 2 Middle AA view;

[0027] Figure 4 A top view of the biomass gasifier with automatic coke removal provided in an embodiment of the present application;

[0028] Figure 5 A bottom view of the biomass gasifier with automatic coke removal provided in an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the structure of the air inlet furnace plate provided in an embodiment of the present application;

[0030] Figure 7 A diagram showing the connection relationship between the disc and the chassis provided in an embodiment of the present application;

[0031] Figure 8 A schematic diagram of the structure of the air supply ring provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100-base bracket;

[0034] 110- horizontal bar; 111- hollow tube; 120- vertical bar; 130- oblique support bar; 140- mounting platform;

[0035] 200-main tank body; 201-furnace door; 202-fire outlet;

[0036] 210-inner tank; 220-outer tank; 230-water cooling chamber; 240-control valve;

[0037] 300- Focus system:

[0038] 310-discharging hopper; 311-external hopper; 312-internal hopper; 320-hopper driving device; 330-coke cleaning guide plate;

[0039] 400-Air Intake System:

[0040] 410- bellows; 411- air inlet pipe; 411a- upper air inlet pipe; 411b- lower air inlet pipe; 412- flange bearing; 413- steam delivery pipe;

[0041] 420-inlet furnace plate; 421-outlet; 422-chassis; 423-dish plate; 424-oblique teeth; 425-support plate; 426-center vent hole;

[0042] 430 - air supply circle; 431 - air supply hole; 432 - air supply pipe. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the embodiment of the present application. It is worth noting that the embodiments described in the drawings are only part of the embodiments of the present application, not all of the embodiments. That is, the embodiments described by the drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application.

[0044] The following will be combined Figures 1 to 8 The biomass gasification furnace with automatic coke cleaning provided in the embodiment of the present application is described.

[0045] The present application embodiment provides a biomass gasification furnace with automatic coke removal, referring to Figure 1-Figure 5 As shown, it includes a base support 100, a main tank body 200, an air inlet system 400 and a coke outlet system 300. The main tank body 200 is fixedly connected to the upper part of the base support 100. The upper part of the main tank body 200 is a feed inlet, and the lower part of the main tank body 200 is a coke outlet.

[0046] The coke discharge system 300 includes a discharge hopper 310 and a hopper driving device 320. The discharge hopper 310 includes an outer hopper 311 that closes downward and a cylindrical inner hopper 312. The diameter of the bottom of the outer hopper 311 is greater than or equal to the outer diameter of the main tank body 200. The outer hopper 311 coaxially surrounds the lower part of the main tank body 200, and there is a gap between the bottom of the outer hopper 311 and the bottom of the main tank body 200. The diameter of the inner hopper 312 is smaller than the inner diameter of the main tank body 200. The inner hopper 312 is coaxially fixed to the bottom of the outer hopper 311, and the top of the inner hopper 312 extends into the main tank body 200. The hopper driving device 320 is connected to the discharge hopper 310 and drives the discharge hopper 310 to rotate axially.

[0047] The air inlet system 400 includes a wind box 410, an air inlet furnace plate 420 and an air supply ring 430. The wind box 410 is used to connect the fan. The air inlet furnace plate 420 is installed on the top of the inner bucket 312. There is a gap between the air inlet furnace plate 420 and the inner wall of the main tank body 200. The bottom of the air inlet furnace plate 420 is connected to the wind box 410 through an air inlet pipe 411. The diameter of the air inlet furnace plate 420 decreases from bottom to top along the axial direction of the main tank body 200. A plurality of air outlets 421 are arranged on the side of the air inlet furnace plate 420 in the height direction. The air outlets 421 at the same height are tangentially discharged in the same direction along the circumference. The air supply ring 430 is fixedly connected to the inner wall of the middle part of the main tank body 200. Air supply holes 431 are evenly arranged on the air supply ring 430. The air supply ring 430 is connected to the wind box 410 through an air supply pipe 432.

[0048] Biomass solid fuel is added to the feed port of the main tank body 200 (the cover at the feed port is not shown), and the fuel is burned in a stratified gasification reaction in the main tank body 200, and the burned slag is discharged to the discharge hopper 310 through the coke outlet.

[0049] The outer bucket 311 of the discharge hopper 310 surrounds the set height outside the main tank body 200 to facilitate the storage of a set amount of slag. The inner bucket 312 of the discharge hopper 310 extends into the main tank body 200 to a set height to provide a certain air outlet height for the air inlet furnace plate 420. A plurality of slag breaking teeth can be welded to the outer wall of the inner bucket 312 to further enhance the crushing effect of the slag. A gap of 80 mm to 90 mm can be retained between the bottom of the discharge hopper 310 and the bottom of the main tank body 200 to facilitate the discharge of slag.

[0050] The gap between the lowermost end of the air inlet furnace plate 420 and the inner wall of the main tank body 200 can be equal to the gap between the inner bucket 312 and the inner wall of the main tank body 200 to avoid affecting the smooth discharge of slag. The air outlets 421 at adjacent heights of the air inlet furnace plate 420 can be staggered or arranged one by one. The diameter of the air inlet furnace plate 420 can gradually decrease or decrease in size in a stepped manner.

[0051] The air supply ring 430 can be welded to the inner wall of the main tank body 200 in an annular tube shape, or can be welded to the inner wall of the main tank body 200 in a half-cut annular tube shape as described below.

[0052] The automatic coke-cleaning biomass gasification furnace of the embodiment of the present application is provided with a hopper driving device to drive the axial rotation of the discharge hopper; an air inlet furnace plate is provided at the top of the discharge hopper, and a gap is provided between the air inlet furnace plate and the main tank body to provide a channel for the slag to be discharged into the discharge hopper; the diameter of the air inlet furnace plate becomes smaller along the height direction, thereby increasing the contact area between the slag and the air inlet furnace plate, which is conducive to crushing the slag; the air inlet furnace plate forms an air outlet for tangential air outlet in the height direction, so that the air outlet of the air inlet furnace plate forms a swirl wind inside the main tank body, thereby increasing the contact area between the fuel, the air inlet furnace plate and the air inlet, so that the fuel obtains sufficient gasification conditions for cracking, avoiding large-area slagging, and the slag automatically falls into the gap between the furnace plate and the main tank body with the swirl wind, and then falls into the discharge hopper; an air supply circle is provided in the middle of the main tank body to increase the contact area between the fuel and the air inlet, so that the reaction is more sufficient.

[0053] The embodiment of the present application optimizes the coke removal system and air intake system of the biomass gasifier, realizes automatic cleaning of waste slag through an automatic coke cleaning discharge hopper, adopts an air supply ring to increase the air intake contact area, makes the reaction more complete, changes the gas flow direction, reduces flue gas emissions, and improves the efficiency of air intake utilization; optimizes the traditional furnace plate structure, adopts a direct discharge waste treatment structure, does not block the pipeline, and improves the utilization efficiency of equipment; improves the traditional furnace plate structure, and reduces the production and later maintenance costs.

[0054] In one possible implementation, referring to Figure 2-Figure 4 Combination Figure 5-Figure 6 As shown, the air inlet furnace plate 420 includes a bottom plate 422 and a plurality of discs 423, the bottom plate 422 is connected to the top of the inner bucket 312, the plurality of discs 423 are spaced apart from bottom to top along the axial direction of the main tank body 200, the diameters of the bottom plate 422 and the plurality of discs 423 decrease successively from bottom to top, the edge of each layer of discs 423 is bevel teeth 424 uniformly distributed along the circumferential direction, the bevel teeth 424 are connected to a support plate 425 for support on one side facing the bottom plate 422, and an air outlet 421 is formed between adjacent support plates 425 of each layer of discs 423.

[0055] The bottom plate 422 , the top plate 423 and the plates 423 between the bottom plate 422 are respectively provided with a central vent hole 426 . The central vent hole 426 on the bottom plate 422 is connected to the air box 410 through the air inlet pipe 411 .

[0056] The bottom plate 422 can be integrally connected with the top of the inner bucket 312, so that the bottom plate 422 can be used as the bottom of the air inlet furnace plate 420 and the top of the inner bucket 312. The oblique teeth 424 of each layer of the disc 423 are evenly distributed in the same direction along the circumference, so that the air entering from the central vent hole 426 of each layer is discharged from the air outlet 421 in the same rotation direction. With the axial rotation of the discharge hopper, the air outlet of the air inlet furnace plate 420 forms a rotating flow of air, which in turn drives the slag swirl, and falls into the gap between the feed furnace plate and the inner wall under the blocking effect of the inner wall of the main tank body 200, and then falls into the discharge hopper.

[0057] A lifting ear can be welded at the center of the disc 423 at the top, which is convenient for lifting and transportation and has a slag-breaking effect.

[0058] In one possible implementation, referring to Figure 2-Figure 4 and Figure 6 As shown, the number of the disks 423 is 3 to 4 layers, the diameter of the central vent hole 426 is 120 mm to 130 mm, and the difference between the diameter of the bottom plate 422 and the outer diameter of the disks 423 at the bottom layer is 20 mm to 25 mm.

[0059] In this way, a sufficient number of air inlets distributed with a certain gap distance can be formed on the air inlet furnace plate 420, which can provide an air volume that satisfies automatic coking and sufficient combustion.

[0060] In one possible implementation, referring to Figure 6 As shown, each support plate 425 is arranged outwardly and away from the center.

[0061] In this way, the air outlet can not only have tangential swirl air outlet, but also have axial air outlet with a certain inclination angle, thereby increasing the swirl driving effect on the slag.

[0062] In one possible implementation, referring to Figure 3 and Figure 4 As shown, the main tank body 200 includes an inner tank 210 and an outer tank 220 which are coaxially sleeved and connected, and a water cooling chamber 230 is formed between the inner tank 210 and the outer tank 220. The water cooling chamber 230 is connected with a cold water inlet and a steam outlet, and the steam outlet is connected to the air inlet pipe 411 through a steam delivery pipe 413. The steam delivery pipe 413 and the air supply pipe 432 are respectively provided with a control valve 240.

[0063] In this way, the water cooling chamber 230 can cool the main tank body 200 to increase the service life of the main tank body 200, and the steam from the steam outlet of the water cooling chamber 230 can be supplemented to the steam delivery pipe 413 to provide the air intake of the air inlet furnace plate 420 with air having a set calorific value, composition, and humidity, so as to achieve a more sufficient oxygen supply and more uniform reaction conditions, and obtain high-quality combustible gas products.

[0064] In some embodiments, a temperature sensor, a humidity sensor, and an air volume sensor may be provided on the air inlet pipe 411 and the air supply pipe 432, and a controller may be provided to connect and control the valve 240 to achieve automatic control of the air inlet and air supply.

[0065] In one possible implementation, referring to Figure 1 and Figure 2 As shown, the coke removal system further includes a coke clearing guide plate 330, the upper portion of which is connected to the bottom of the outer wall of the main tank body 200 and extends axially, and the lower portion of the coke clearing guide plate 330 is bent relative to the upper portion.

[0066] The bend at the bottom of the coke clearing guide plate 330 may be arranged opposite to the rotation direction of the discharge hopper 310, and may extend a certain distance toward the inside of the main tank body 200. In some embodiments, the inner tank 210 of the main tank body 200 extends downward a certain distance beyond the outer tank 220, and the lower extension area of ​​the coke clearing guide plate 330 gradually decreases and bends to the inner tank 210.

[0067] Thus, during the rotation process, the lower portion of the decoking guide plate 330 guides the slag in the main tank 200 outward to the outer edge of the lower portion of the discharge hopper 310. When the slag in the discharge hopper 310 reaches a certain height, the upper portion of the decoking guide plate 330 guides the slag out to the outer edge of the upper portion of the discharge hopper 310.

[0068] In one possible implementation, referring to Figure 3 and Figure 8 As shown, the air supply ring 430 is a half-cut annular ring located on the inner side after being cut along the circumferential center line of the annular ring, and the air supply ring 430 is welded to the inner wall of the main tank body 200 along the circumferential direction.

[0069] In this way, the air supply ring 430 provides dry air intake to the middle of the main tank body 200, increasing the contact area between the air intake and the fuel. The air supply ring 430 structure saves materials while meeting the air supply volume requirements.

[0070] In one possible implementation, referring to Figure 8 As shown, the air supply ring 430 is provided with 3 to 4 layers of air supply holes 431, the apertures of the air supply holes 431 located at the top and bottom layers are 5 mm to 6 mm, and the apertures of the air supply holes 431 located at the middle layer are 8 mm to 9 mm.

[0071] In this way, the air supply circle 430 can supply air from three directions: upper, middle and lower, to further increase the contact area between the incoming air and the fuel and improve the combustion effect.

[0072] In a feasible embodiment, the hopper driving device includes a motor, a turbine reducer and a driving gear. The driving gear is fixed to the bottom of the discharge hopper 310. A mounting platform 140 is provided on the base bracket 100. The motor and the turbine reducer are mounted on the mounting platform 140. The motor drives the turbine reducer to engage with the driving gear for transmission.

[0073] In this way, the discharge hopper 310 can be driven to rotate by the motor, and the rotation speed and rotation direction are adjustable.

[0074] In some embodiments, the driving of the discharge hopper 310 can also be achieved through a sprocket drive.

[0075] In one possible implementation, referring to Figure 3 Combined with Figure 1 and Figure 2 As shown, the base support 100 includes two vertically connected cross bars 110 , the ends of each cross bar 110 are respectively connected to a vertical bar 120 , and the top of the vertical bar 120 is connected to the main tank body 200 through an oblique support rod 130 .

[0076] A cross bar 110 is a hollow tube 111, one end of which is connected to the bellows 410, and a lower air inlet pipe 411b extending upward is arranged in the middle of the hollow tube 111 corresponding to the center of the air inlet furnace plate 420, and an upper air inlet pipe 411a extending downward is arranged in the center of the air inlet furnace plate 420, and a flange bearing 412 is connected between the upper air inlet pipe 411a and the lower air inlet pipe 411b.

[0077] The crossbar 110 and the vertical bar 120 can be square bars or round bars. Any one of the two crossbars 110 is used as the hollow tube 111. The upper air inlet pipe 411a and the lower air inlet pipe 411b are rotated through the flange bearing 412 without affecting the air intake. The flange bearing 412 can be a bearing in the prior art.

[0078] It can be understood that the hollow tube 111 , the lower air inlet pipe 411 b and the upper air inlet pipe 411 a together form an air inlet pipe between the wind box 410 and the air inlet furnace plate 420 .

[0079] In one possible implementation, referring to Figure 1 As shown, the main tank body 200 is provided with a furnace door 201 and a fire outlet 202 . The furnace door 201 is located at the lower part of the side of the main tank body 200 close to the air inlet furnace plate 420 , and the fire outlet 202 is located at the top position of the side of the main tank body 200 .

[0080] Among them, two symmetrical furnace doors 201 can be set at the lower part of the main tank body 200. In this way, the slag discharge of the coke outlet can be observed through the furnace doors 201, and it is convenient for maintenance.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An automatic coke-cleaning biomass gasifier, characterized in that: It includes a base support, a main tank body, an air inlet system and a coke outlet system. The main tank body is fixedly connected to the upper part of the base support. The upper part of the main tank body is a feed inlet, and the lower part of the main tank body is a coke outlet. The coke discharge system includes a discharge hopper and a hopper driving device. The discharge hopper includes an outer hopper with a downwardly closed opening and a cylindrical inner hopper. The diameter of the bottom of the outer hopper is greater than or equal to the outer diameter of the main tank body. The outer hopper coaxially surrounds the lower part of the main tank body, and there is a gap between the bottom of the outer hopper and the bottom of the main tank body. The diameter of the inner hopper is smaller than the inner diameter of the main tank body. The inner hopper is coaxially fixed to the bottom of the outer hopper, and the top of the inner hopper extends into the main tank body. The hopper driving device is connected to the discharge hopper and drives the discharge hopper to rotate axially. The air intake system includes a bellows, an air intake furnace plate and an air supply ring, the bellows being used to connect to a fan; the air intake furnace plate is installed on the top of the inner bucket, a gap is provided between the air intake furnace plate and the inner wall of the main tank body, the bottom of the air intake furnace plate is connected to the bellows through an air intake pipe, the diameter of the air intake furnace plate decreases along the axial direction of the main tank body from bottom to top, a plurality of air outlets are arranged on the side of the air intake furnace plate along the height direction, and the air outlets at the same height discharge air tangentially in the same direction along the circumference; the air supply ring is fixedly connected to the inner wall of the middle part of the main tank body, air supply holes are evenly distributed on the air supply ring, and the air supply ring is connected to the bellows through an air supply pipe.

2. The biomass gasification furnace with automatic coke removal according to claim 1, characterized in that: The air inlet furnace plate includes a bottom plate and a plurality of discs, the bottom plate is connected to the top of the inner bucket, the plurality of discs are spaced from bottom to top along the axial direction of the main tank body, the diameters of the bottom plate and the plurality of discs decrease from bottom to top, the edges of the discs of each layer are bevel teeth uniformly distributed along the circumferential direction, the bevel teeth are connected to a support plate for support on one side facing the bottom plate, and the air outlet is formed between the adjacent support plates of each layer of the discs; The chassis, the disc located at the top layer and the discs of each layer between the chassis are respectively provided with a central vent hole, and the central vent hole on the chassis is connected to the bellows through the air inlet pipe.

3. The biomass gasification furnace with automatic coke removal according to claim 2, characterized in that: The number of the discs is 3 to 4 layers, the diameter of the central vent hole is 120 mm to 130 mm, and the difference between the diameter of the bottom plate and the outer diameter of the disc located at the bottom layer is 20 mm to 25 mm; And / or, each of the support plates is arranged outwardly and away from the center.

4. The biomass gasification furnace with automatic coke removal according to claim 1, characterized in that: The main tank body includes an inner tank and an outer tank connected by a coaxial sleeve, a water cooling chamber is formed between the inner tank and the outer tank, the water cooling chamber is connected to a cold water inlet and a steam outlet, the steam outlet is connected to the air inlet pipe through a steam delivery pipe; the steam delivery pipe and the air supply pipe are respectively provided with control valves.

5. The biomass gasification furnace with automatic coke removal according to any one of claims 1 to 4, characterized in that: The coke removal system further comprises a coke clearing guide plate, the upper portion of which is connected to the bottom of the outer wall of the main tank body and extends axially, and the lower portion of which is bent relative to the upper portion.

6. The biomass gasification furnace with automatic coke removal according to any one of claims 1 to 4, characterized in that: The air supply ring is a half-cut annular ring located on the inner side after being cut along the circumferential center line of the annular ring, and the air supply ring is welded to the inner wall of the main tank body along the circumferential direction.

7. The biomass gasification furnace with automatic coke removal according to claim 6, characterized in that: The air supply ring is provided with 3 to 4 layers of air supply holes, the diameters of the air supply holes located at the top and bottom layers are 5 mm to 6 mm, and the diameter of the air supply holes located at the middle layer is 8 mm to 9 mm.

8. The biomass gasification furnace with automatic coke removal according to any one of claims 1 to 4, characterized in that: The hopper driving device includes a motor, a turbine reducer and a driving gear. The driving gear is fixed to the bottom of the discharge hopper. A mounting platform is provided on the base bracket. The motor and the turbine reducer are mounted on the mounting platform. The motor drives the turbine reducer to engage with the driving gear for transmission.

9. The biomass gasification furnace with automatic coke removal according to any one of claims 1 to 4, characterized in that: The base support comprises two vertically connected cross bars, the ends of each cross bar are respectively connected to a vertical bar, and the top of the vertical bar is connected to the main tank body through an oblique support rod; One of the cross bars is a hollow tube, one end of which is connected to the bellows, a lower air inlet pipe extending upward is arranged in the middle of the hollow tube corresponding to the center of the air inlet furnace plate, an upper air inlet pipe extending downward is arranged in the center of the air inlet furnace plate, and a flange bearing is connected between the upper air inlet pipe and the lower air inlet pipe.

10. The biomass gasification furnace with automatic coke removal according to any one of claims 1 to 4, characterized in that: The main tank body is provided with a furnace door and a fire outlet. The furnace door is located at the lower part of the side of the main tank body close to the air inlet furnace plate, and the fire outlet is located at the top position of the side of the main tank body.

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