Biomass synthesis gas cooling water tube waste heat boiler

Abstract

The utility model discloses a kind of biomass synthesis gas cooling water pipe type waste heat boiler, it is related to biomass gasification technical field, including pressure-containing steel shell;Heat insulation air inlet passage subassembly, set in the top of pressure-containing steel shell, for introducing high-temperature biomass synthesis gas;Air outlet passage subassembly, set in the bottom of pressure-containing steel shell, for leading out after cooling biomass synthesis gas;Heat exchange subassembly, set in the inside of pressure-containing steel shell, including radiation water-cooled wall, convection water-cooled wall and convection heat exchange pipe group;Tube panel import seal plate and tube panel export seal plate are connected with the both ends of pressure-containing steel shell respectively, and tube panel import seal plate and tube panel export seal plate and radiation water-cooled wall, convection water-cooled wall and pressure-containing steel shell jointly enclose a closed loop cavity;Inert gas is filled in closed loop cavity as balance gas, and the pressure of balance gas side is greater than the pressure of biomass synthesis gas side.The above-mentioned biomass synthesis gas cooling water pipe type waste heat boiler solves the technical problem of low heat exchange efficiency of existing waste heat recovery equipment.

Description

Technical Field

[0001] This utility model relates to the field of biomass gasification technology, and in particular to a biomass syngas cooling water pipe type waste heat boiler. Background Technology

[0002] With the continued growth of global energy demand and the advancement of the "dual carbon" goal, the resource depletion and environmental pollution problems caused by the large-scale use of fossil fuels are becoming increasingly prominent. Promoting the development of clean and renewable alternative energy sources has become a core task of energy transition. Biomass, as the only renewable carbon source, can convert low-value biomass raw materials such as straw, sawdust, and forestry waste into biomass syngas under high-temperature and oxygen-deficient conditions through gasification technology. This syngas can then be used to produce high-value-added clean energy and chemical products such as green hydrogen, green methanol, and green ammonia, achieving both resource recycling and carbon reduction benefits.

[0003] In biomass pressurized gasification processes, the outlet syngas temperature typically reaches 800–1100℃, containing a large amount of sensible heat. This heat must be effectively cooled and recovered using a waste heat boiler to produce byproduct steam for system use or external export, thereby improving overall energy efficiency. However, existing waste heat recovery equipment mostly uses traditional fire-tube structures, which suffer from low heat exchange efficiency and susceptibility to ash and salt buildup.

[0004] Therefore, how to provide a waste heat boiler with tubular water cooling water for biomass syngas to improve heat exchange efficiency is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a biomass syngas cooling water pipe type waste heat boiler, which solves the technical problem of low heat exchange efficiency in existing waste heat recovery equipment.

[0006] To achieve the above objectives, this utility model provides a biomass syngas cooling water tubular waste heat boiler, comprising:

[0007] Pressure-bearing steel shell;

[0008] The insulated air intake channel assembly, located at the top of the pressure-bearing steel shell, is used to introduce high-temperature biomass syngas.

[0009] The gas outlet channel assembly is located at the bottom of the pressure-bearing steel shell and is used to draw out the cooled biomass syngas.

[0010] The heat exchange components are located inside the pressure-bearing steel shell and include radiant water-cooled walls, convection water-cooled walls, and convection heat exchange tube assemblies.

[0011] The tube screen inlet sealing plate and the tube screen outlet sealing plate are connected to both ends of the pressure-bearing steel shell, respectively. The tube screen inlet sealing plate and the tube screen outlet sealing plate together with the radiant water-cooled wall, the convective water-cooled wall and the pressure-bearing steel shell form a closed annular cavity. The closed annular cavity is filled with inert gas as a balancing gas, and the pressure on the balancing gas side is greater than the pressure on the biomass syngas side.

[0012] Preferably, the heat exchange assembly further includes a first expansion joint and a second expansion joint;

[0013] The first expansion joint is sealed between the radiant water-cooled wall and the convection water-cooled wall;

[0014] The second expansion joint is sealed between the convection water-cooled wall and the tube panel outlet sealing plate.

[0015] Preferably, the radiative water-cooled wall and the convection water-cooled wall have the same structure, both including:

[0016] Multiple water-cooled wall tubes arranged side by side;

[0017] Fins connecting adjacent water-cooled wall tubes;

[0018] The first inlet header for introducing the working fluid and the first outlet header for collecting the working fluid after heat exchange.

[0019] And a first connector located on top of the first inlet header, the top end of the first connector being fixedly connected to the pressure-bearing steel shell.

[0020] Preferably, the water-cooled wall tube is one of a riser, a spiral coil, or a serpentine coil, with its two ends welded and connected to the first inlet header and the first outlet header, respectively.

[0021] Preferably, the convection heat exchange tube assembly is located inside the convection water-cooled wall and includes a coil, a coil connecting plate, a second inlet header, and a second outlet header; the inlet end of the coil is sealed and connected to the second inlet header, and the outlet end is sealed and connected to the second outlet header; the coil connecting plate is welded or bolted between adjacent coils.

[0022] Preferably, it further includes a second connector located on the top of the second inlet header, the top end of the second connector being fixedly connected to the convection water-cooled wall, and the second connector being a rigid support rod or a tie rod.

[0023] Preferably, the convection heat exchanger tube group is configured as one or more groups; each group contains one or more coils, and the coils are spiral coils or serpentine coils.

[0024] Preferably, the heat-insulated air inlet channel assembly includes an upper pressure-bearing head and a refractory lining disposed on the inner wall of the upper pressure-bearing head; the bottom of the upper pressure-bearing head is fixedly connected to the top of the pressure-bearing steel shell, and a through biomass syngas inlet channel is formed inside the refractory lining.

[0025] Preferably, the gas outlet channel assembly is a lower pressure-bearing head; the side wall of the lower pressure-bearing head is provided with a biomass syngas outlet, and the bottom is provided with a dust removal port.

[0026] Preferably, it also includes a dust removal and rapping assembly, which is correspondingly disposed on the outer side of the radiant water-cooled wall and the convection water-cooled wall. A rapping transmission element is also provided at the corresponding position between the convection water-cooled wall and the convection heat exchange tube assembly to transmit the rapping force to the convection heat exchange tube assembly.

[0027] Compared with the above-mentioned background technology, the beneficial effects of the biomass syngas cooling water tubular waste heat boiler provided by this utility model are as follows:

[0028] The radiant water-cooled wall and the convection water-cooled wall adopt a vertical water tube structure. High-temperature biomass syngas flows outside the tube, while the working fluid, boiler water or steam, circulates inside the tube for heat exchange. Compared with existing technologies, this avoids the risks of condensation, scale buildup, and blockage of high-ash, high-alkali metal, and high-tar syngas on the narrow inner wall of the heat exchange tube, thus improving heat exchange efficiency.

[0029] The inlet and outlet sealing plates of the tube screen, together with the pressure-bearing steel shell, form a closed inert gas annular cavity, and the pressure of the annular cavity is maintained higher than that of the syngas side, forming a positive pressure sealing barrier, which effectively prevents corrosive syngas from contacting the pressure-bearing steel shell. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a front view of a biomass syngas cooling water pipe type waste heat boiler provided in an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the radiant water-cooled wall structure provided in an embodiment of the present utility model;

[0033] Figure 3 for Figure 2 Sectional view of AA;

[0034] Figure 4 This is a schematic diagram of the convection heat exchanger tube assembly structure provided in an embodiment of the present utility model;

[0035] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle.

[0036] in:

[0037] 1-Pressure-bearing steel shell, 2-Radiant water-cooled wall, 21-Water-cooled wall tube, 22-Fin, 23-First inlet header, 24-First outlet header, 25-First connector, 3-Convection water-cooled wall, 4-Convection heat exchange tube assembly, 41-Coil, 42-Coil connecting plate, 43-Second inlet header, 44-Second outlet header, 45-Second connector, 5-Tube screen inlet sealing plate, 51-Tube screen outlet sealing plate, 6-First expansion joint, 61-Second expansion joint, 7-Upper pressure-bearing head, 71-Refractory lining, 72-Biomass syngas inlet channel, 8-Lower pressure-bearing head, 81-Biomass syngas outlet, 82-Ash cleaning port. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] See Figure 1 This utility model provides a biomass syngas cooling water tube type waste heat boiler, including a pressure-bearing steel shell 1; an insulated air inlet channel assembly, set at the top of the pressure-bearing steel shell 1, for introducing high-temperature biomass syngas; an air outlet channel assembly, set at the bottom of the pressure-bearing steel shell 1, for leading out the cooled biomass syngas; a heat exchange assembly, set inside the pressure-bearing steel shell 1, including a radiant water-cooled wall 2, a convection water-cooled wall 3, and a convection heat exchange tube group 4; a tube screen inlet sealing plate 5 and a tube screen outlet sealing plate 51, respectively connected to both ends of the pressure-bearing steel shell 1, the tube screen inlet sealing plate 5 and the tube screen outlet sealing plate 51 together with the radiant water-cooled wall 2, the convection water-cooled wall 3 and the pressure-bearing steel shell 1 to form a closed annular cavity; the closed annular cavity is filled with an inert gas as a balancing gas, and the pressure on the balancing gas side is greater than the pressure on the biomass syngas side.

[0041] Specifically, the insulated air inlet channel assembly is located at the top of the pressure-bearing steel shell 1 and is used to introduce high-temperature biomass syngas from the biomass pressurized gasifier, with a temperature typically between 800 and 1100°C. The air outlet channel assembly is located at the bottom of the pressure-bearing steel shell 1 and is used to draw out the fully cooled biomass syngas, with an outlet temperature controllable between 200 and 400°C. The heat exchange assembly is located inside the pressure-bearing steel shell 1 and includes, in sequence along the syngas flow direction, a radiant water-cooled wall 2, a convective water-cooled wall 3, and a convective heat exchange tube group 4. The tube screen inlet sealing plate 5 and the tube screen outlet sealing plate 51 are respectively sealed to the top and bottom of the pressure-bearing steel shell 1, forming a closed annular cavity together with the heat exchange assembly and the pressure-bearing steel shell 1. Inert gases such as nitrogen and carbon dioxide are continuously introduced into the closed annular cavity as balancing gases to ensure that the pressure on the balancing gas side is always higher than the pressure on the biomass syngas side, thereby preventing syngas containing ash or alkali metals from seeping into the annular cavity and protecting the pressure-bearing steel shell 1 from high-temperature corrosion and thermal stress damage.

[0042] The radiant water-cooled wall 2 is located in the high-temperature zone at the top of the boiler, undertaking radiant heat exchange in the high-temperature section. The outlet flue gas temperature of the radiant water-cooled wall 2 is controlled at no less than 620℃ to delay the condensation of alkali metals in the reducing atmosphere as much as possible, avoiding precipitation and blockage at the front of the equipment. The convection water-cooled wall 3 is located downstream of the radiant water-cooled wall 2, and uses a membrane water-cooled tube structure to perform convective heat exchange on the synthesis gas, further reducing the flue gas temperature. The convection heat exchange tube group 4 is set inside the convection water-cooled wall 3 and can be configured as an evaporator or superheater to recover the waste heat of the tail flue gas and produce saturated steam or superheated steam as a by-product, thereby improving the energy utilization efficiency of the system.

[0043] The working process of a biomass syngas cooling water tubular waste heat boiler is as follows:

[0044] High-temperature biomass syngas enters the insulated air intake channel assembly from the gasifier outlet via a pipeline.

[0045] Biomass syngas first enters the radiant water-cooled wall 2 region, where it transfers a large amount of heat to the working fluid boiler water or steam inside the water-cooled wall tubes through radiation. The flue gas temperature drops rapidly to about 620-700℃, while alkali metals condense and precipitate in the larger rear section, facilitating subsequent cleaning. The cooled syngas then enters the convective water-cooled wall 3, where it continues to release heat through external convective heat exchange, further reducing the flue gas temperature to about 400-500℃. The syngas then flows through the convective heat exchange tube group 4, achieving final waste heat recovery.

[0046] Based on the above embodiments, see Figures 1-3The radiant water-cooled wall 2 and the convective water-cooled wall 3 have the same structure, both including multiple water-cooled wall tubes 21 arranged side by side; fins 22 connecting adjacent water-cooled wall tubes 21; a first inlet header 23 for introducing the working fluid and a first outlet header 24 for collecting the working fluid after heat exchange; and a first connector 25 located on the top of the first inlet header 23, the top end of the first connector 25 being fixedly connected to the pressure-bearing steel shell 1.

[0047] Specifically, it includes multiple water-cooled wall tubes 21 arranged side by side in a vertical direction; fins 22 and water-cooled wall tubes 21 are integrally formed by welding or rolling to form a membrane wall structure, so as to enhance the overall rigidity of the heating surface, improve the heat exchange efficiency and prevent high-temperature syngas from leaking into the closed ring cavity, a first inlet header 23 for introducing boiler feedwater or steam and a first outlet header 24 for collecting the working fluid after heat exchange, the first inlet header 23 is connected to the external water supply system, and the first outlet header 24 is connected to the steam drum or steam output system to form a closed working fluid circulation loop;

[0048] The first connecting member 25 is a rigid support rod or tie rod, the top of which is fixedly connected to the inner wall of the pressure-bearing steel shell 1, and is used to bear the gravity load of the heat exchange component and the vibration and thermal stress during operation.

[0049] Based on the above embodiments, the water-cooled wall tube 21 is one of a riser, a spiral coil, or a serpentine coil, and its specific form is selected according to actual needs; the upper end of the water-cooled wall tube 21 is welded to the first inlet header 23 and the lower end is welded to the first outlet header 24 to form a continuous and sealed working fluid flow channel.

[0050] Based on the above embodiments, see Figure 1 The heat exchange assembly also includes a first expansion joint 6 and a second expansion joint 61; the first expansion joint 6 is sealed between the radiant water-cooled wall 2 and the convection water-cooled wall 3; the second expansion joint 61 is sealed between the convection water-cooled wall 3 and the tube screen outlet sealing plate 51.

[0051] Specifically, the first expansion joint 6 is sealed between the radiant water-cooled wall 2 and the convection water-cooled wall 3 to absorb the axial and radial thermal expansion displacement caused by the temperature gradient difference between the two under high-temperature operating conditions, and to avoid deformation of the tube screen structure or cracking of the weld due to thermal stress concentration. The second expansion joint 61 is sealed between the convection water-cooled wall 3 and the tube screen outlet sealing plate 51 to compensate for the cumulative thermal expansion between the downstream heat exchange element and the outlet end.

[0052] Both the first expansion joint 6 and the second expansion joint 61 adopt a metal bellows structure, which has good high temperature resistance, pressure resistance and fatigue life. Their two ends are connected to adjacent components by welding or flanges to achieve airtight connection and communicate with the closed ring cavity, so that the outside of the expansion joint is always in an inert equilibrium gas environment, preventing high temperature synthesis gas from corroding the bellows body and extending the service life of the equipment.

[0053] Furthermore, the closed annular cavity is formed by the tube screen inlet sealing plate 5, the radiant water-cooled wall 2, the first expansion joint 6, the convection water-cooled wall 3, the second expansion joint 61, the tube screen outlet sealing plate 51, and the pressure-bearing steel shell 1.

[0054] Based on the above embodiments, see Figure 4 and Figure 5 The convection heat exchanger tube assembly 4 is located inside the convection water-cooled wall 3 and includes a coil 41, a coil connecting plate 42, a second inlet header 43, and a second outlet header 44. The inlet end of the coil 41 is sealed and connected to the second inlet header 43, and the outlet end is sealed and connected to the second outlet header 44. The coil connecting plate 42 is welded or bolted between adjacent coils 41. It also includes a second connector 45 located on the top of the second inlet header 43. The top end of the second connector 45 is fixedly connected to the convection water-cooled wall 3. The second connector 45 is a rigid support rod or a tie rod. The convection heat exchanger tube assembly 4 is configured as one or more assemblies. Each assembly includes a single or multiple coils 41. The coils 41 are spiral coils 41 or serpentine coils 41.

[0055] In other words, the inlet end of the coil 41 is sealed and connected to the second inlet header 43, and the outlet end is sealed and connected to the second outlet header 44, forming a closed working fluid circulation loop. The coil connecting plate 42 is welded or connected to the adjacent coils 41 by high-strength bolts to fix the coil spacing. The top end of the second connecting piece 45 is fixedly connected to the inner wall of the convection water-cooled wall 3. The second connecting piece 45 is a rigid support rod or tie rod to bear the weight of the convection heat exchange tube group 4.

[0056] The convection heat exchanger tube group 4 can be set as one or more groups, each group containing a single or multiple coils 41. The coils 41 are spiral coils or serpentine coils, and their specific forms are determined comprehensively based on heat exchange efficiency, pressure drop control and installation space.

[0057] Based on the above embodiments, the heat-insulated air inlet channel assembly includes an upper pressure-bearing head 7 and a refractory lining 71 disposed on the inner wall of the upper pressure-bearing head 7; the bottom of the upper pressure-bearing head 7 is fixedly connected to the top of the pressure-bearing steel shell 1, and a through biomass syngas inlet channel 72 is formed inside the refractory lining 71, and the air outlet channel assembly is a lower pressure-bearing head 8; the side wall of the lower pressure-bearing head 8 is provided with a biomass syngas outlet 81, and the bottom is provided with a ash removal port 82.

[0058] Specifically, the bottom of the upper pressure-bearing head 7 is fixedly connected to the top of the pressure-bearing steel shell 1 by welding or flange, forming the pressure-bearing boundary at the top of the boiler; the refractory lining 71 is made of high-alumina, corundum or silicon carbide refractory material, which is tightly attached to the inner wall of the upper pressure-bearing head 7, and a through biomass syngas inlet channel 72 is formed inside, which is used to guide the high-temperature syngas with a temperature of up to 800-1100℃ into the boiler smoothly, while effectively isolating the metal head from direct thermal shock, preventing local overheating deformation or failure.

[0059] The gas outlet channel assembly is a lower pressure-bearing head 8, the top of which is sealed to the bottom of the pressure-bearing steel shell 1, forming the pressure-bearing structure at the bottom of the boiler. The side wall of the lower pressure-bearing head 8 is provided with a biomass syngas outlet 81, which is used to lead the fully cooled syngas to the subsequent purification or utilization system. The bottom of the lower pressure-bearing head 8 is provided with an ash removal port 82, which is used to periodically or continuously discharge the ash, tar condensate and alkali metal salt deposits that settle during operation, to prevent ash accumulation and blockage, and to ensure the long-term stable operation of the boiler.

[0060] Based on the above embodiments, a dust removal and rapping assembly 9 is also included. The dust removal and rapping assembly 9 is disposed on the outside of the radiant water-cooled wall 2 and / or the convection water-cooled wall 3. A rapping transmission component 10 is also provided at the corresponding position between the convection water-cooled wall 3 and the convection heat exchange tube group 4 to transmit the rapping force to the convection heat exchange tube group 4.

[0061] Specifically, the ash removal and rapping assembly 9 is located on the outside of the radiant water-cooled wall 2 and / or the convective water-cooled wall 3, and is used to periodically or continuously mechanically rap the heated surface during boiler operation to remove ash, tar and alkali metal salt deposits attached to the outer surface of the water-cooled wall tube 21, and prevent the heat transfer efficiency from decreasing and the flow section from becoming blocked.

[0062] Furthermore, a rapping transmission component 10 is provided at the corresponding position between the convection water-cooled wall 3 and the convection heat exchange tube group 4; one end of the rapping transmission component 10 is connected to the rapping assembly 9 or the rapping point of the convection water-cooled wall 3, and the other end extends to the coil 41 area of ​​the convection heat exchange tube group 4, so as to effectively transmit the impact force generated by rapping to the convection heat exchange tube group 4, thereby realizing the synchronous rapping of the heated surface of the convection heat exchange tube group 4; the rapping assembly 9 of this application is a direct use of the prior art, and can be a hammer-type or vibration-type device driven by pneumatic, electric or hydraulic power.

[0063] In summary, the beneficial effects of the biomass syngas cooling water tubular waste heat boiler provided by this utility model are as follows:

[0064] Adopting a water-tube vertical structure, high-temperature biomass syngas flows outside the tubes, while boiler water or steam circulates inside the tubes for heat exchange. Compared with the traditional fire-tube type (syngas flows through the tubes), it avoids the risks of high-ash, high-alkali metal, and high-tar syngas condensing, accumulating scale, and clogging on the narrow inner wall of the heat exchange tubes, thus improving heat exchange efficiency.

[0065] The system is equipped with a rapping assembly and a rapping transfer device to achieve online cleaning of the radiating section, convection section, and deep coil area, effectively removing accumulated ash and alkali metal salt deposits.

[0066] By controlling the flue gas temperature at the outlet of the radiant water-cooled wall to no less than 620℃, alkali metals are delayed in condensation in a reducing atmosphere, guiding them to precipitate in the larger, easier-to-clean area at the rear of the boiler, thus avoiding the formation of dense hard scale in critical parts at the front of the equipment and reducing the risk of blockage.

[0067] The inlet and outlet sealing plates of the tube screen, together with the pressure-bearing steel shell, form a closed inert gas annular cavity, and the pressure of the annular cavity is maintained higher than that of the syngas side, forming a positive pressure sealing barrier, which effectively prevents corrosive syngas from contacting the pressure-bearing steel shell.

[0068] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0069] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A biomass syngas cooling water tubular waste heat boiler, characterized in that, include: Pressure-bearing steel shell (1); A heat-insulated air intake channel assembly is disposed at the top of the pressure-bearing steel shell (1) for introducing high-temperature biomass syngas; An exhaust channel assembly is located at the bottom end of the pressure-bearing steel shell (1) and is used to draw out the cooled biomass syngas. The heat exchange assembly is located inside the pressure-bearing steel shell (1) and includes a radiant water-cooled wall (2), a convective water-cooled wall (3), and a convective heat exchange tube assembly (4). The inlet sealing plate (5) and outlet sealing plate (51) of the tube screen are respectively connected to both ends of the pressure-bearing steel shell (1). The inlet sealing plate (5) and outlet sealing plate (51) of the tube screen together with the radiant water-cooled wall (2), the convective water-cooled wall (3) and the pressure-bearing steel shell (1) form a closed ring cavity. The closed ring cavity is filled with inert gas as a balance gas, and the pressure on the balance gas side is greater than the pressure on the biomass synthesis gas side.

2. The biomass syngas cooling water tubular waste heat boiler according to claim 1, characterized in that, The heat exchange assembly also includes a first expansion joint (6) and a second expansion joint (61). The first expansion joint (6) is sealed between the radiant water-cooled wall (2) and the convection water-cooled wall (3); The second expansion joint (61) is sealed between the convection water-cooled wall (3) and the tube screen outlet sealing plate (51).

3. The biomass syngas cooling water tubular waste heat boiler according to claim 1, characterized in that, The radiative water-cooled wall (2) and the convective water-cooled wall (3) have the same structure, both including: Multiple water-cooled wall tubes arranged side by side (21); Fins (22) connecting adjacent water-cooled wall tubes (21); The first inlet header (23) for introducing the working fluid and the first outlet header (24) for collecting the working fluid after heat exchange. And a first connector (25) located on the top of the first inlet header (23), the top end of the first connector (25) being fixedly connected to the pressure-bearing steel shell (1).

4. The biomass syngas cooling water tubular waste heat boiler according to claim 3, characterized in that, The water-cooled wall tube (21) is one of a riser, a spiral coil or a serpentine coil, and its two ends are welded and connected to the first inlet header (23) and the first outlet header (24) respectively.

5. The biomass syngas cooling water tubular waste heat boiler according to claim 1, characterized in that, The convection heat exchange tube assembly (4) is located inside the convection water-cooled wall (3) and includes a coil (41), a coil connecting plate (42), a second inlet header (43), and a second outlet header (44). The inlet end of the coil (41) is sealed and connected to the second inlet header (43), and the outlet end is sealed and connected to the second outlet header (44). The coil connecting plate (42) is welded or bolted between adjacent coils (41).

6. The biomass syngas cooling water tubular waste heat boiler according to claim 5, characterized in that, It also includes a second connector (45) located on the top of the second inlet header (43), the top of the second connector (45) being fixedly connected to the convection water-cooled wall (3), and the second connector (45) being a rigid support rod or a tie rod.

7. The biomass syngas cooling water tubular waste heat boiler according to claim 5, characterized in that, The convection heat exchange tube group (4) is configured as one or more groups; each group contains one or more turns of the coil (41), and the coil (41) is a spiral coil or a serpentine coil.

8. The biomass syngas cooling water tubular waste heat boiler according to claim 1, characterized in that, The heat-insulated air inlet channel assembly includes an upper pressure-bearing head (7) and a refractory lining (71) disposed on the inner wall of the upper pressure-bearing head (7); the bottom of the upper pressure-bearing head (7) is fixedly connected to the top of the pressure-bearing steel shell (1), and a through biomass syngas inlet channel (72) is formed inside the refractory lining (71).

9. The biomass syngas cooling water tubular waste heat boiler according to claim 8, characterized in that, The gas outlet channel assembly is a lower pressure-bearing head (8); the side wall of the lower pressure-bearing head (8) is provided with a biomass syngas outlet (81), and the bottom is provided with a dust removal port (82).

10. The biomass syngas cooling water tubular waste heat boiler according to claim 1, characterized in that, It also includes a dust removal and rapping assembly (9), which is disposed on the outer side of the radiant water-cooled wall (2) and the convective water-cooled wall (3). A rapping transmission element (10) is also provided at the corresponding position between the convective water-cooled wall (3) and the convective heat exchange tube group (4) to transmit the rapping force to the convective heat exchange tube group (4).

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