A biomass gasification heating system

Abstract

The present invention discloses a biomass gasification heating system, and relates to the technical field of boiler heating systems. The present invention includes a biomass gasification furnace, a gas boiler, and a buffer gas tank. The combustible gas output port at the upper end of the biomass gasification furnace transports the combustible gas to the buffer gas tank through a first pipeline; the buffer gas tank transports the stored combustible gas to the gas boiler through a second pipeline; the biomass gasification furnace grate is sequentially provided with a combustible gas reflux burner for igniting biomass fuel, an air-steam co-supply device for supplying and exhausting oxygen to the biomass fuel pile, and a combustible gas reflux internal combustion device for assisting the pyrolysis of biomass fuel. The present invention uses a biomass gasification furnace, a gas boiler, and a buffer gas tank, in conjunction with a combustible gas reflux burner, an air-steam co-supply device, and a combustible gas reflux internal combustion device to jointly regulate the cracking rate of biomass fuel in the biomass gasification furnace, dynamically adjust the supply and demand changes, and solve the problem of the difficulty of supply and demand regulation in the existing biomass gasification heating system.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler heating systems, and in particular relates to a biomass gasification heating system. Background Art

[0002] Biomass energy has been widely used as a renewable, pollution-free clean energy. Biomass gasification and combustion is one of the main ways to efficiently utilize biomass. Biomass gasification and combustion generally uses a dedicated biomass gasifier and a matching biomass boiler system. At present, there is a relatively complete implementation structure and it has achieved certain industrial applications. For example, the invention patent with the authorization announcement number CN104560218B discloses a biomass gasifier and an industrial gas boiler combined with an efficient heating system. This system uses the steam produced by the industrial gas boiler, part of which is supplied to the gasifier as a gasification medium. The steam and air are combined for gasification, which helps to improve the stability and quality of the biomass gas; the preheated air is supplied to the industrial gas boiler as a combustion-supporting gas, which can improve the overall thermal efficiency; the electrolytic decoking cracker can crack the tar in the biomass gas, improve the stability of the biomass gas, and help the combustion of the biomass gas. It uses the steam produced by the gas boiler to participate in the gasification process of the gasifier to improve the overall pyrolysis efficiency. The above process is the application of steam to improve pyrolysis efficiency, which is suitable for efficient and stable biomass gasification heating system. For application scenarios where the power of steam demand side varies greatly, the above heating system is difficult to adjust. In order to be able to dynamically control the working conditions where the heating demand power varies greatly, this application document provides a biomass gasification heating system. Summary of the invention

[0003] The object of the present invention is to provide a biomass gasification heating system, which solves the problem of difficulty in supply and demand regulation in existing biomass gasification heating systems by regulating the cracking rate of biomass fuel in the biomass gasification furnace through a biomass gasification furnace, a gas boiler, a buffer gas tank, a combustible gas reflux burner, an air-steam co-supply device and a combustible gas reflux internal combustion device, and dynamically adjusting the supply and demand changes.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention discloses a biomass gasification heating system, comprising a biomass gasifier, a gas boiler and a buffer gas tank. The combustible gas output port at the upper end of the biomass gasifier conveys the combustible gas to the buffer gas tank through a first pipeline; the buffer gas tank conveys the stored combustible gas to the gas boiler through a second pipeline; a combustible gas reflow burner for igniting biomass fuel, an air-steam co-supply device for supplying and exhausting oxygen to a biomass fuel pile and a combustible gas reflow internal combustion burner for assisting the pyrolysis of biomass fuel are sequentially arranged upward on the grate of the biomass gasifier; a first igniter and a second igniter for igniting the combustible gas reflow burner and the combustible gas reflow internal combustion burner are respectively installed on the biomass gasifier; a compressor is installed on the first pipeline; the combustible gas reflow burner is provided with A first gas connecting pipe; the air-steam co-supply device is provided with a first air connecting pipe and a steam connecting pipe; the combustible gas reflux internal combustion device is provided with a second gas connecting pipe and a second air connecting pipe; the first gas connecting pipe, the first air connecting pipe, the steam connecting pipe, the second gas connecting pipe and the second air connecting pipe are respectively penetrated and fixed on the biomass gasification furnace; the first gas connecting pipe and the second gas connecting pipe are connected to the buffer gas tank through a three-way pipe; a first valve is installed on the branch pipe connected to the first gas connecting pipe by the three-way pipe; a second valve is installed on the branch pipe connected to the second gas connecting pipe by the three-way pipe; the steam connecting pipe is connected to the steam output end of the gas boiler through a third pipe; a third valve is installed on the third pipe.

[0006] As a preferred technical solution of the present invention, the combustible gas reflow burner includes a combustion gas head; the combustion gas head is arranged on the upper side of the biomass gasification furnace grate; the lower end of the combustion gas head is connected to the first gas connecting pipe passing through the biomass gasification furnace grate; the upper end of the combustion gas head is installed with a conical cap.

[0007] As a preferred technical solution of the present invention, the air-steam co-supply device includes an air guide ring; a first ring cavity and a second ring cavity are arranged inside the air guide ring, and the second ring cavity is located above the first ring cavity; the first air connecting pipe is connected to the first ring cavity; the steam connecting pipe is connected to the second ring cavity; the inner ring wall of the first ring cavity is provided with an air injection channel obliquely downward; the inner ring wall of the first ring cavity is penetrated by a circle of air extension injection pipes; the inner ring wall of the second ring cavity is provided with a steam injection channel obliquely downward; the inner ring wall of the second ring cavity is penetrated by a circle of steam extension injection pipes.

[0008] As a preferred technical solution of the present invention, the combustible gas reflux internal combustion burner includes a gas supply ring pipe, an air supply ring pipe, and a smoke ring tube; the second gas connecting pipe is connected to the gas supply ring pipe; the second air connecting pipe is connected to the air supply ring pipe; the gas supply ring pipe is located on the upper side of the air supply ring pipe; the air supply ring pipe and the smoke ring tube are connected through a ring-arranged mixing combustion pipe; the upper end of the gas supply ring pipe is fixedly connected to a circle of injection branch pipes arranged in a ring, and the injection branch pipes pass through the outer wall of the mixing combustion pipe to its interior; the upper end of the smoke ring tube is fixedly connected to a smoke exhaust pipe.

[0009] As a preferred technical solution of the present invention, the mixed combustion tube is a circular tube with a C-shaped structure, and the middle section of the mixed combustion tube is a vertical straight tube section. Combustion mainly occurs in the straight tube section of the mixed combustion tube, and the annular array of C-shaped mixed combustion tubes increases the heat radiation range of the biomass fuel.

[0010] As a preferred technical solution of the present invention, the feed end of the biomass gasifier uses a bucket elevator to feed the material, and a gas outlet is provided on one side of the lower end of the bucket elevator; the gas outlet is connected to the biomass gasifier through a fourth pipeline; a screw conveyor is installed at the slag outlet at the lower end of the biomass gasifier to output the residue. The high-temperature mixed gas in the drying area at the upper end of the biomass gasifier enters the bucket elevator to heat and dry the biomass fuel in the bucket elevator, thereby reducing the energy consumption of the biomass fuel after entering the biomass gasifier. During the drying process, the combustible gas generated by cracking and the original combustible gas flow back to the biomass gasifier from the fourth pipeline to reduce the waste of combustible gas.

[0011] As a preferred technical solution of the present invention, the first blower and the second blower are respectively installed at the outer ends of the first air connecting pipe and the second air connecting pipe. The aerobic combustion intensity of the biomass fuel in the biomass gasification furnace is regulated by adjusting the air volume of the first blower, that is, the rate of generating combustible gas by cracking in the biomass gasification furnace is regulated. The combustion intensity of the combustible gas reflux internal combustion engine is jointly regulated by adjusting the air volume of the second blower and synchronously adjusting the opening amount of the second valve, thereby adjusting the pyrolysis temperature of the biomass fuel by the combustible gas reflux internal combustion engine, that is, adjusting the rate of generating combustible gas by cracking in the biomass gasification furnace.

[0012] As a preferred technical solution of the present invention, a cyclone dust collector for dust removal of combustible mixed gas and a condenser for steam condensation are installed on the first pipeline. The cyclone dust collector will separate dust particles from the combustible mixed gas flow by centrifugal force and capture them on the wall, and then use gravity to make the dust particles fall into the ash hopper. The combustible mixed gas flow after dust removal enters the condenser, and the vapor is liquefied, and the tar is liquefied and flows into the liquid collection part to be separated from the combustible gas. The combustible gas and air are compressed by the compressor and stored in the buffer gas tank.

[0013] As a preferred technical solution of the present invention, the gas boiler is a gas steam boiler or a gas steam generator. The gas boiler uses the combustible mixed gas generated by the biomass gasification furnace as fuel, burns and heats water to generate steam for heating.

[0014] The present invention has the following beneficial effects:

[0015] 1. The present invention adjusts the supply and demand changes brought about by the changes in the gas production rate of the biomass gasifier and the changes in the combustion power of the gas boiler within the storage capacity by using a buffer gas tank, and cooperates with the combustible gas reflux burner, the air-steam co-supply device and the combustible gas reflux internal combustion device to jointly regulate the cracking rate of the biomass fuel in the biomass gasifier, so that the entire biomass gasification heating system is in a dynamic balance state.

[0016] 2. The present invention participates in the regulation of the combustion intensity of biomass fuel by passing the steam generated by the gas boiler through a pipeline to the air-steam co-supply device arranged in the biomass gasifier, and can quickly extinguish the combustion of biomass fuel and stop the operation of the biomass gasifier. The overall pyrolysis efficiency of the biomass gasifier can be quickly reduced, and the regulation response speed is fast.

[0017] 3. The present invention combines the reflux gas from the buffer gas tank with the combustible gas reflux burner and the air-steam co-supply device arranged inside the biomass gasifier, and the flame of the combustion gas head ignites the surrounding biomass fuel, quickly re-ignites the biomass fuel in the biomass gasifier, and improves the pyrolysis efficiency and has a fast response speed.

[0018] 4. The combustion gas refluxed from the buffer gas tank of the present invention is combined with the combustible gas reflux internal combustion burner arranged inside the biomass gasifier to burn in a closed mixing combustion tube. The heat radiation is directed to the biomass fuel wrapped around the mixing combustion tube to promote its cracking to produce combustible gas. The cracking of the biomass fuel in the combustion process is coordinated with the cracking of the biomass fuel, which increases the cracking rate control range of the biomass gasifier, can quickly increase the biomass cracking gas production efficiency, and has a fast control response speed.

[0019] 5. The feed end of the biomass gasifier of the present invention uses a bucket elevator to feed the material, and an outlet is opened on one side of the lower end of the bucket elevator, and the residual cracking gas is returned to the biomass gasifier through a pipeline. During the process, the biomass fuel is dried to reduce the energy consumption of the biomass fuel after entering the biomass gasifier, and reduce the influence of the raw materials on pyrolysis.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a biomass gasification heating system of the present invention.

[0023] Figure 2 This is a partial schematic diagram of the interior of a biomass gasifier.

[0024] Figure 3 It is a schematic diagram of the structure of a combustible gas recirculation burner.

[0025] Figure 4 This is a schematic diagram of the structure of the air-steam combined supply unit.

[0026] Figure 5 It is a schematic diagram of the axial section of the air-steam cogeneration unit.

[0027] Figure 6 It is a schematic diagram of the structure of a combustible gas reflow internal combustion engine.

[0028] Figure 7 A top view of a combustible gas recirculation internal combustion engine.

[0029] Figure 8 for Figure 7 Cross-sectional view at AA in the middle.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1-Biomass gasifier, 2-gas boiler, 3-buffer gas tank, 4-combustible gas reflux burner, 5-air steam co-supply, 6-combustible gas reflux internal combustion, 7-first igniter, 8-second igniter, 9-compressor, 11-first pipeline, 12-second pipeline, 13-three-way pipeline, 14-first valve, 15-second valve, 16-third pipeline, 17-third valve, 18-first blower, 19-second blower, 41-first gas connecting pipe, 42-combustion Gas head, 43-conical cap, 51-first air connecting pipe, 52-steam connecting pipe, 53-air guide ring, 54-first ring cavity, 55-second ring cavity, 56-air injection ring channel, 57-air extension injection pipe, 58-steam injection ring channel, 59-steam extension injection pipe, 61-second gas connecting pipe, 62-second air connecting pipe, 63-gas supply ring pipe, 64-air supply ring pipe, 65-smoke ring tube, 66-mixing combustion pipe, 67-injection branch pipe, 68-smoke exhaust pipe. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific embodiments

[0033] See also Figure 1-8 As shown, the present invention is a biomass gasification heating system, including a biomass gasifier 1, a gas boiler 2, and a buffer gas tank 3. The combustible gas output port at the upper end of the biomass gasifier 1 transports the combustible gas to the buffer gas tank 3 through a first pipeline 11. The buffer gas tank 3 transports the stored combustible gas to the gas boiler 2 through a second pipeline 12. A compressor 9 is installed on the first pipeline 11. The combustible gas generated by cracking or incomplete combustion of the biomass gasifier 1 is first compressed by the compressor 9 and stored in the buffer gas tank 3, and then transported from the buffer gas tank 3 to the gas boiler 2. The buffer gas tank 3 adjusts the supply and demand changes caused by the changes in the gas production rate of the biomass gasifier 1 and the changes in the combustion power of the gas boiler 2 within the storage capacity range, so that the entire biomass gasification heating system is in a dynamic balance state.

[0034] The biomass gasification furnace 1 is provided with a combustible gas reflow burner 4 for igniting biomass fuel, an air-steam co-supply device 5 for supplying and exhausting oxygen to the biomass fuel pile, and a combustible gas reflow internal combustion burner 6 for assisting the pyrolysis of biomass fuel in sequence upward from the grate. The biomass gasification furnace 1 is respectively provided with a first igniter 7 and a second igniter 8 for igniting the combustible gas reflow burner 4 and the combustible gas reflow internal combustion burner 6, wherein the number of the second igniters 8 for igniting the combustible gas reflow internal combustion burner 6 can correspond to the number of independent combustion flames.

[0035] The combustible gas reflow burner 4 is provided with a first gas connecting pipe 41. The air-steam co-supply device 5 is provided with a first air connecting pipe 51 and a steam connecting pipe 52. The combustible gas reflow internal combustion burner 6 is provided with a second gas connecting pipe 61 and a second air connecting pipe 62. The first gas connecting pipe 41, the first air connecting pipe 51, the steam connecting pipe 52, the second gas connecting pipe 61 and the second air connecting pipe 62 are respectively penetrated and fixed on the biomass gasification furnace 1. The first gas connecting pipe 41 and the second gas connecting pipe 61 are connected to the buffer gas tank 3 through a three-way pipe 13. A first valve 14 is installed on the branch pipe connected to the three-way pipe 13 and the first gas connecting pipe 41. The first valve 14 adjusts the flow rate of the combustible gas that refluxes to participate in the ignition and combustion, that is, regulates the size of the range of the biomass fuel ignited by the combustible gas reflow burner 4. A second valve 15 is installed on the branch pipe connected to the three-way pipe 13 and the second gas connecting pipe 61. The second valve 15 adjusts the flow rate of the combustible gas entering the combustible gas recirculation internal combustion engine 6, and then regulates the combustion power in the closed state inside the combustible gas recirculation internal combustion engine 6. The combustible gas recirculation internal combustion engine 6 buried in the biomass fuel radiates heat outward, and the high temperature causes the biomass fuel to crack and produce combustible gas. The steam connecting pipe 52 is connected to the steam output end of the gas boiler 2 through the third pipeline 16. The third valve 17 is installed on the third pipeline 16. The third valve 17 regulates the rate of steam injection to the biomass fuel that is participating in the combustion or cracking state of the biomass gasification furnace 1. The steam rushes in to drive away the oxygen of the biomass gasification furnace 1. As the oxygen decreases, the burning biomass fuel gradually extinguishes. When the steam content in the biomass fuel reaches 40%, it will cause the biomass fuel to extinguish. By regulating the amount of steam input by the third valve 17, the combustion state of the biomass fuel can be quickly regulated, and then the cracking rate of the biomass fuel can be regulated.

[0036] Among them Figure 1-3 As shown, the combustible gas reflux burner 4 specifically includes a combustion gas head 42. The combustion gas head 42 is arranged on the upper side of the grate of the biomass gasifier 1. The lower end of the combustion gas head 42 is connected to the first gas connecting pipe 41 that passes through the grate of the biomass gasifier 1. A conical cap 43 is installed on the upper end of the combustion gas head 42. The first gas connecting pipe 41 is connected to the buffer gas tank 3 through the three-way pipe 13, and the combustible gas generated by the biomass gasifier 1 flows back into the biomass gasifier 1 to participate in the ignition of the biomass fuel. The combustible gas is ejected from the multiple holes of the combustion gas head 42 and ignited by the first igniter 7. The conical cap 43 is unfolded at the upper end to ensure that there is a combustion space around the combustion gas head 42, and the circumferential flame of the combustion gas head 42 ignites the biomass fuel on the surrounding side.

[0037] Among them Figure 1-2 and Figure 4-5As shown, the air-steam co-supply device 5 specifically includes an air guide ring 53. A first annular cavity 54 and a second annular cavity 55 are provided inside the air guide ring 53, and the second annular cavity 55 is located above the first annular cavity 54. The first air connecting pipe 51 is connected to the first annular cavity 54. The steam connecting pipe 52 is connected to the second annular cavity 55. The inner annular wall of the first annular cavity 54 is provided with an air injection annular channel 56 which is inclined downward. The inner annular wall of the first annular cavity 54 is penetrated by a circle of air extension injection pipes 57. The inner annular wall of the second annular cavity 55 is provided with a steam injection annular channel 58 which is inclined downward. The inner annular wall of the second annular cavity 55 is penetrated by a circle of steam extension injection pipes 59 which are fixed. The first air connecting pipe 51 is connected to the outside of the biomass gasifier 1 to provide oxygen for oxidative combustion. In the first aspect, the ignition and re-ignition rate of the biomass fuel is increased by increasing the air supply to the combustible gas reflow burner 4 and the oxygen supply to the air-steam co-supply device 5. Secondly, the steam connecting pipe 52 is connected to the steam output end of the gas boiler 2 through the third pipeline 16, and the steam produced by the gas boiler 2 is used to participate in the regulation of the combustion intensity of the biomass fuel, and can quickly extinguish the combustion of the biomass fuel and stop the operation of the biomass gasifier 1.

[0038] Among them Figure 1-2 and Figure 6-8 As shown, the combustible gas reflow internal combustion engine 6 specifically includes a gas supply ring pipe 63, an air supply ring pipe 64, and a flue gas ring tube 65. The second gas connecting pipe 61 is connected to the gas supply ring pipe 63. The second air connecting pipe 62 is connected to the air supply ring pipe 64. The gas supply ring pipe 63 is located on the upper side of the air supply ring pipe 64. The air supply ring pipe 64 and the flue gas ring tube 65 are connected through a ring-arranged mixing combustion pipe 66. The upper end of the gas supply ring pipe 63 is fixedly connected to a circle of jet branch pipes 67 arranged in a ring, and the jet branch pipes 67 pass through the outer wall of the mixing combustion pipe 66 to the inside thereof. The upper end of the flue gas ring tube 65 is fixedly connected to a smoke exhaust pipe 68. The second gas connection pipe 61 is connected to the buffer gas tank 3 through the three-way pipe 13, and the combustible gas is refluxed. The second air connection pipe 62 is connected to the outside air of the biomass gasifier 1, mixed in the mixed combustion pipe 66, ignited by the second igniter 8, and burned in the mixed combustion pipe 66. The combustion process directly heats the mixed combustion pipe 66, and the heat radiates to the biomass fuel wrapped around the mixed combustion pipe 66 to cause it to crack and produce combustible gas, which cooperates with the cracking of the biomass fuel combustion process to increase the cracking rate control range of the biomass gasifier 1. The lower half of the flue gas ring 65 is set in the pyrolysis zone, and the upper half is set in the dryer to dry the generated gas.

[0039] Among them Figure 6 and Figure 8As shown, the mixed combustion tube 66 is a round tube with a C-shaped structure, and the middle section of the mixed combustion tube 66 is a vertical straight tube section. Combustion mainly occurs in the straight tube section of the mixed combustion tube 66. The C-shaped mixed combustion tube 66 in the annular array increases the heat radiation range of the biomass fuel, mainly pyrolyzing the biomass fuel in the pyrolysis zone.

[0040] In order to heat the biomass fuel entering the biomass gasifier 1 in advance to remove moisture and reduce the decrease in cracking temperature after entering the biomass gasifier 1, a bucket elevator is used at the feed end of the biomass gasifier 1 to feed the material, and a gas outlet is opened on one side of the lower end of the bucket elevator. The gas outlet is connected to the biomass gasifier 1 through a fourth pipeline. A screw conveyor is installed at the slag discharge port at the lower end of the biomass gasifier 1 to output the residue. The high-temperature mixed gas in the drying area at the upper end of the biomass gasifier 1 enters the bucket elevator to heat and dry the biomass fuel in the bucket elevator, thereby reducing the energy consumption of the biomass fuel after entering the biomass gasifier 1. During the drying process, the combustible gas generated by cracking and the original combustible gas flow back to the biomass gasifier 1 from the fourth pipeline to reduce the waste of combustible gas.

[0041] In order to adjust the aerobic combustion efficiency of the biomass fuel and the combustible gas reflow, the first blower 18 and the second blower 19 are respectively installed at the outer end of the first air connecting pipe 51 and the outer end of the second air connecting pipe 62. The aerobic combustion intensity of the biomass fuel in the biomass gasification furnace 1 is regulated by adjusting the air volume of the first blower 18, that is, the rate of generating combustible gas by cracking in the biomass gasification furnace 1 is regulated. The aerobic combustion ignition efficiency of the combustible gas reflow burner 4 is regulated by adjusting the air volume of the first blower 18. The combustion intensity inside the combustible gas reflow internal combustion engine 6 is jointly regulated by adjusting the air volume of the second blower 19 and synchronously adjusting the opening amount of the second valve 15, thereby adjusting the pyrolysis temperature of the biomass fuel by the combustible gas reflow internal combustion engine 6, that is, adjusting the rate of generating combustible gas by cracking in the biomass gasification furnace 1.

[0042] In order to remove ash and water from the cracked combustible gas before it enters the buffer gas tank 3, a cyclone dust collector for dust removal of the combustible mixed gas and a condenser for steam condensation are installed on the first pipeline 11. The cyclone dust collector will separate the dust particles from the combustible mixed gas flow by centrifugal force and capture them on the wall, and then use gravity to make the dust particles fall into the ash hopper. The combustible mixed gas flow after dust removal enters the condenser, and the vapor is liquefied, and the tar is liquefied and flows into the liquid collection part to be separated from the combustible gas. The combustible gas and air are compressed by the compressor 9 and stored in the buffer gas tank 3.

[0043] The gas boiler 2 uses the combustible mixed gas generated by the biomass gasification furnace 1 as fuel, burns and heats water to generate steam for heating. The gas boiler 2 uses a gas steam boiler or a gas steam generator. A gas steam boiler is used when the power change is small, and a gas steam generator is used when the power change is large.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A biomass gasification heating system, characterized in that: It comprises a biomass gasifier (1), a gas boiler (2), and a buffer gas tank (3); the combustible gas outlet at the upper end of the biomass gasifier (1) transports the combustible gas to the buffer gas tank (3) via a first pipeline (11); the buffer gas tank (3) transports the stored combustible gas to the gas boiler (2) via a second pipeline (12); The biomass gasifier (1) is provided with a combustible gas reflow burner (4) for igniting biomass fuel, an air-steam co-supply device (5) for supplying and exhausting oxygen to the biomass fuel pile, and a combustible gas reflow internal combustion burner (6) for assisting the pyrolysis of the biomass fuel in sequence upwardly from the grate; the biomass gasifier (1) is provided with a first igniter (7) for igniting the combustible gas reflow burner (4); the biomass gasifier (1) is provided with a second igniter (8) for igniting the combustible gas reflow internal combustion burner (6); and the first pipeline (11) is provided with a compressor (9); The combustible gas reflow burner (4) is provided with a first gas connecting pipe (41); The air-steam co-supply device (5) is provided with a first air connecting pipe (51) and a steam connecting pipe (52); The combustible gas reflow internal combustion engine (6) is provided with a second gas connecting pipe (61) and a second air connecting pipe (62); The first gas connecting pipe (41), the first air connecting pipe (51), the steam connecting pipe (52), the second gas connecting pipe (61) and the second air connecting pipe (62) are respectively penetrated and fixed on the biomass gasifier (1); The first gas connection pipe (41) and the second gas connection pipe (61) are connected to the buffer gas tank (3) via a three-way pipe (13); a first valve (14) is installed on the branch pipe connecting the three-way pipe (13) and the first gas connection pipe (41); a second valve (15) is installed on the branch pipe connecting the three-way pipe (13) and the second gas connection pipe (61); The steam connecting pipe (52) is connected to the steam output end of the gas boiler (2) through a third pipe (16); a third valve (17) is installed on the third pipe (16); The combustible gas reflow burner (4) comprises a combustion gas head (42); the combustion gas head (42) is arranged on the upper side of the grate of the biomass gasifier (1); the lower end of the combustion gas head (42) is connected to the first gas connecting pipe (41) passing through the grate of the biomass gasifier (1); the upper end of the combustion gas head (42) is installed with a conical cap (43); The air-steam co-supply device (5) comprises an air guide ring (53); a first annular cavity (54) and a second annular cavity (55) are arranged inside the air guide ring (53), and the second annular cavity (55) is located above the first annular cavity (54); the first air connecting pipe (51) is in communication with the first annular cavity (54); the steam connecting pipe (52) is in communication with the second annular cavity (55); an air injection annular channel (56) obliquely downward is provided on the inner annular wall of the first annular cavity (54); a circle of air extension injection pipes (57) are fixedly passed through the inner annular wall of the first annular cavity (54); a steam injection annular channel (58) obliquely downward is provided on the inner annular wall of the second annular cavity (55); a circle of steam extension injection pipes (59) are fixedly passed through the inner annular wall of the second annular cavity (55); The combustible gas reflow internal combustion burner (6) comprises a gas supply ring pipe (63), an air supply ring pipe (64), and a flue gas ring tube (65); the second gas connecting pipe (61) is in communication with the gas supply ring pipe (63); the second air connecting pipe (62) is in communication with the air supply ring pipe (64); the gas supply ring pipe (63) is located on the upper side of the air supply ring pipe (64); the air supply ring pipe (64) and the flue gas ring tube (65) are in communication via a mixing combustion pipe (66) arranged in a ring; the upper end of the gas supply ring pipe (63) is fixedly connected to a circle of jet branch pipes (67) arranged in a ring, and the jet branch pipes (67) pass through the outer wall of the mixing combustion pipe (66) to the inside thereof; the upper end of the flue gas ring tube (65) is fixedly connected to a smoke exhaust pipe (68).

2. A biomass gasification heating system according to claim 1, characterized in that: The mixed combustion tube (66) is a circular tube with a C-shaped structure, and the middle section of the mixed combustion tube (66) is a vertical straight tube section.

3. The biomass gasification heating system according to claim 1, characterized in that: The feed end of the biomass gasifier (1) uses a bucket elevator to feed materials, and a gas outlet is provided on one side of the lower end of the bucket elevator; the gas outlet is connected to the biomass gasifier (1) through a fourth pipeline; and a screw conveyor is installed at the slag discharge port at the lower end of the biomass gasifier (1) to discharge the residue.

4. The biomass gasification heating system according to claim 1, characterized in that: A first blower (18) is installed at the outer end of the first air connecting pipe (51); and a second blower (19) is installed at the outer end of the second air connecting pipe (62).

5. The biomass gasification heating system according to claim 1, characterized in that: The first pipeline (11) is provided with a cyclone dust collector for dust removal of the combustible mixed gas and a condenser for condensing steam.

6. The biomass gasification heating system according to claim 1, characterized in that: The gas boiler (2) is a gas steam boiler or a gas steam generator.

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