Gasification combustion boiler

Abstract

The utility model relates to a gasification combustion boiler, and belongs to the technical field of boilers. The problem that fuel combustion of a traditional corner tube type boiler is insufficient is solved. Comprising a boiler body, a pipe frame, a fuel hopper and a chain grate stoker, and the boiler body is composed of membrane water cooling walls on the periphery and the top; the pipe frame is arranged on the periphery of the furnace body; the chain grate stoker is mounted at the bottom of the furnace body; the fuel hopper is mounted on the chain grate stoker; a partition wall water cooling wall is arranged in the boiler body and divides the interior of the boiler body into a hearth and a convection flue which are arranged front and back. A front ignition arch is arranged at the lower part of the front side water cooling wall of the boiler body; a rear arch is arranged at the lower part of the partition wall water-cooled wall; the gasification arch is arranged on the front side of the front ignition arch, and a gasification chamber is formed between the gasification arch and the front ignition arch; a smoke outlet window is formed in the upper portion of the front ignition arch, fuel generates combustible gas in the gasification chamber, the combustible gas and smoke enter the hearth through the smoke outlet window for secondary combustion, and the combustion efficiency of the fuel is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of boilers, and in particular to a gasification combustion boiler. Background Technology

[0002] Angle tube boilers are a common type of industrial boiler. Their structure mainly consists of tube supports and water-cooled walls, with the tube supports serving to support and connect the water-cooled walls. In this design, fuel (such as coal, oil, or gas) is burned in the boiler's combustion chamber, and the resulting heat is transferred to water through the angle tubes, thus producing steam. However, traditional angle tube boilers have a problem: they lack effective gasification, leading to incomplete combustion.

[0003] Due to incomplete combustion, the flue gas emitted by traditional corner tube boilers contains a high proportion of unburned hydrocarbons and harmful gases such as carbon monoxide, which not only reduces energy efficiency but also increases environmental pollution. Utility Model Content

[0004] In view of the problem of incomplete fuel combustion in traditional corner tube boilers, the purpose of this utility model is to provide a gasification combustion boiler.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A gasification combustion boiler includes a furnace body 1, a tube frame 2, a fuel hopper 3, and a chain grate 4. The furnace body 1 is composed of membrane water-cooled walls on all four sides and the top. The tube frame 2 is arranged around the outer perimeter of the furnace body 1 to support the furnace body 1 and connect to the membrane water-cooled walls. The chain grate 4 is installed at the bottom of the furnace body 1. The fuel hopper 3 is installed on the chain grate 4. The chain grate 4 is provided with multiple ventilation slots 401. A partition water-cooled wall 5 is provided inside the furnace body 1, which divides the interior of the furnace body 1 into a furnace chamber 6 arranged front and rear and a convection flue 7. The furnace chamber 6 and the convection flue 7 are connected through a flue gas inlet 8 provided at the upper part of the partition water-cooled wall 5. A front ignition arch 101 is provided at the lower part of the front water-cooled wall of the furnace body 1. A rear arch 501 is provided at the lower part of the partition water-cooled wall 5.

[0007] It also includes a gasification arch 9, which is located in front of the front ignition arch 101. A gasification chamber 10 is formed between the gasification arch 9 and the front ignition arch 101. The left side of the gasification chamber 10 is closed by the left water-cooled wall of the furnace body 1 and refractory bricks, and the right side of the gasification chamber 10 is closed by the right water-cooled wall of the furnace body 1 and refractory bricks. A gasification chamber inlet 11 is formed between the bottom end of the gasification arch 9 and the bottom end of the front ignition arch 101. A feed inlet 12 is formed between the bottom end of the front ignition arch 101 and the chain grate 4. The fuel hopper 3 is located in front of the gasification arch 9, and both the gasification chamber inlet 11 and the feed inlet 12 are connected to the fuel hopper 3. A flue gas outlet window 13 is opened at the top of the front ignition arch 101, and the gasification chamber 10 is connected to the furnace 6 through the flue gas outlet window 13.

[0008] Furthermore, the gasification arch 9 includes a gasification arch wall 901, water shed pipes 902, an upper header 903, and a lower header 904. Multiple water shed pipes 902 are pre-embedded in the gasification arch wall 901 and arranged in a left-right direction. The upper header 903 is connected to the top of the multiple water shed pipes 902, and the lower header 904 is connected to the bottom of the multiple water shed pipes 903.

[0009] Furthermore, the upper header 903 includes a first handhole device 9031, a first handhole end cap 9032, a first cylinder 9033, a first end cap 9034, a pressure gauge seat 9035, a first thermometer seat 9036, and an exhaust valve seat 9037. The first handhole end cap 9032 is installed at one end of the first cylinder 9033, and the first handhole device 9031 is installed on the first handhole end cap 9032. The first end cap 9034 is installed at the other end of the first cylinder 9033, and the first end cap 9034 is provided with a first through hole 9038 communicating with the pipe rack 2. The pressure gauge seat 9035, the first thermometer seat 9036, and the exhaust valve seat 9037 are all connected to the side wall of the first cylinder 9033.

[0010] Furthermore, the lower header 904 includes a second handhole device 9041, a second handhole end cap 9042, a second cylinder 9043, a second end cap 9044, a second thermometer seat 9045, and a drain valve seat 9046. The second handhole end cap 9042 is installed at one end of the second cylinder 9043, and the second handhole device 9041 is installed on the second handhole end cap 9042. The second end cap 9044 is installed at the other end of the second cylinder 9043, and the second end cap 9044 is provided with a second through hole 9047 communicating with the pipe rack 2. The second thermometer seat 9045 and the drain valve seat 9046 are both connected to the side wall of the second cylinder 9043.

[0011] Furthermore, the gasification arch wall 901 includes a lower arch wall 9011, a middle arch wall 9012, and an upper arch wall 9013. The lower arch wall 9011 is vertical, and its outer wall is connected to the fuel hopper 3. The inner wall of the upper arch wall 9013 is connected to the upper part of the front ignition arch 101.

[0012] Furthermore, the front and rear sides of the front ignition arch 101 are both provided with concrete layers.

[0013] Furthermore, both the front and rear sides of the rear arch 501 are provided with concrete layers.

[0014] Furthermore, the rear end of the chain grate 4 and the bottom end of the partition wall water-cooled wall 5 together form a slag discharge port.

[0015] Furthermore, it also includes a flag-shaped heating surface 14, which is installed inside the convection flue 7.

[0016] Furthermore, it also includes a tail flue 15, an economizer 16, and an air preheater 17, wherein the tail flue 15 is connected to the convection flue 7; the economizer 16 and the air preheater 17 are installed in the tail flue 15.

[0017] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies:

[0018] (1) This utility model is equipped with a gasification arch and a front ignition arch, forming a gasification chamber between the gasification arch and the front ignition arch. The flue gas containing combustible gases that accumulates in the gasification chamber enters the furnace for secondary combustion. Compared with traditional corner tube boilers, this reduces the emission of harmful gases from incomplete combustion, which not only reduces heat loss from incomplete combustion but also reduces environmental pollution. Therefore, this utility model improves thermal efficiency and has beneficial effects on environmental protection. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a gasification combustion boiler according to the present invention, viewed from the right side.

[0020] Figure 2 This is a partial structural schematic diagram of a gasification combustion boiler according to the present invention, viewed from the right side.

[0021] Figure 3 This is a front-view structural diagram of the water shed tube, upper header, and lower header of a gasification combustion boiler according to this utility model.

[0022] Figure 4 This is a structural schematic diagram of the water shed tube, upper header, and lower header of a gasification combustion boiler according to the present invention, viewed from the right side.

[0023] Figure 5 This is a schematic diagram of the upper header of a gasification combustion boiler according to this utility model.

[0024] Figure 6 This is a view showing the outer surface development of the first cylinder of a gasification combustion boiler according to this utility model.

[0025] Figure 7 This is a schematic diagram of the lower header of a gasification combustion boiler according to this utility model.

[0026] Figure 8 This is a view showing the outer surface development of the second cylinder of a gasification combustion boiler according to this utility model.

[0027] In the attached diagram: 1. Furnace body; 101. Front ignition arch; 2. Pipe rack; 3. Fuel hopper; 4. Chain grate; 401. Ventilation slot; 5. Water-cooled partition wall; 501. Rear arch; 6. Furnace chamber; 7. Convection flue; 8. Flue; 9. Gasification arch; 901. Gasification arch wall; 9011. Lower arch wall; 9012. Middle arch wall; 9013. Upper arch wall; 902. Water shed pipe; 903. Upper header; 9031. First manhole device; 9032. First manhole end cap; 9033. First cylinder; 9034. First end cap; 9035. Pressure gauge seat; 903 6. First thermometer seat; 9037. Exhaust valve seat; 9038. First through hole; 904. Lower header; 9041. Second handhole device; 9042. Second handhole end cap; 9043. Second cylinder; 9044. Second end cap; 9045. Second thermometer seat; 9046. Drain valve seat; 9047. Second through hole; 10. Gasification chamber; 11. Gasification chamber inlet; 12. Feed inlet; 13. Flue gas outlet window; 14. Flag-type heating surface; 15. Tail flue; 16. Economizer; 17. Air preheater; 18. Boiler drum; 19. Steel frame; 20. Platform ladder. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0029] Please refer to Figures 1 to 8The diagram illustrates a gasification combustion boiler, comprising a furnace body 1, a tube frame 2, a fuel hopper 3, and a chain grate 4. The furnace body 1 is composed of membrane water-cooled walls on its perimeter and top. The tube frame 2 is arranged around the outer perimeter of the furnace body 1 to support the furnace body 1 and connect to the membrane water-cooled walls, and is connected to an external water supply system. The chain grate 4 is installed at the bottom of the furnace body 1. The fuel hopper 3 is installed on the chain grate 4. The chain grate 4 has multiple ventilation slots 401, with multiple ventilation slots 401 on both the left and right sides. The ventilation slots 401 are connected to an external air supply system, and heat is introduced through the ventilation slots 401. Hot air enters the chain grate 4 and then enters the furnace body 1 from above the chain grate 4. The chain grate 4 includes a motor, a frame, and grate plates. Multiple grate plates are installed on the crossbeam frame. The motor drives the grate plates to rotate. The bottom of the furnace body 1 is connected to the frame. The interior of the furnace body 1 is provided with a partition wall water-cooled wall 5, which divides the interior of the furnace body 1 into a furnace chamber 6 arranged in front and rear and a convection flue 7. The furnace chamber 6 and the convection flue 7 are connected through a flue vent 8 provided at the upper part of the partition wall water-cooled wall 5. A front ignition arch 101 is provided at the lower part of the front water-cooled wall of the furnace body 1. A rear arch 501 is provided at the lower part of the partition wall water-cooled wall 5.

[0030] It also includes a gasification arch 9, which is located in front of the front ignition arch 101. A gasification chamber 10 is formed between the gasification arch 9 and the front ignition arch 101. The left side of the gasification chamber 10 is closed by the left water-cooled wall of the furnace body 1 and refractory bricks, and the right side of the gasification chamber 10 is closed by the right water-cooled wall of the furnace body 1 and refractory bricks. A gasification chamber inlet 11 is formed between the bottom end of the gasification arch 9 and the bottom end of the front ignition arch 101. A feed inlet 12 is formed between the bottom end of the front ignition arch 101 and the chain grate 4. A fuel hopper 3 is located in front of the gasification arch 9, and both the gasification chamber inlet 11 and the feed inlet 12 are connected to the fuel hopper 3. A flue gas outlet window 13 is opened at the top of the front ignition arch 101, and the gasification chamber 10 is connected to the furnace 6 through the flue gas outlet window 13. During use, fuel is transported to the chain grate 4 via the fuel hopper 3. As fuel continues to enter and the chain grate 4 rotates, some fuel enters the gasification chamber 10 through the gasification chamber inlet 11, and the other part of fuel enters the furnace 6 through the feed inlet 12.

[0031] Furthermore, in a preferred embodiment, the left water-cooled wall of the furnace body 1 covers a portion of the left side of the gasification chamber 10, and the uncovered portion is sealed with refractory bricks; the right water-cooled wall of the furnace body 1 covers a portion of the right side of the gasification chamber 10, and the uncovered portion is sealed with refractory bricks.

[0032] Furthermore, in a preferred embodiment, the membrane water-cooled walls around and at the top of the furnace body 1 are composed of seamless steel pipes and flat steel, with adjacent seamless steel pipes connected by flat steel.

[0033] Furthermore, in a preferred embodiment, the partition wall water-cooled wall 5 is a membrane water-cooled wall, composed of seamless steel pipes and flat steel, with two adjacent seamless steel pipes connected by flat steel.

[0034] Furthermore, in a preferred embodiment, the gasification arch 9 includes a gasification arch wall 901, water purifier pipes 902, an upper header 903, and a lower header 904. Multiple water purifier pipes 902 are embedded within the gasification arch wall 901 and arranged in a left-right direction. The upper header 903 is connected to the top of the multiple water purifier pipes 902, and the lower header 904 is connected to the bottom of the multiple water purifier pipes 902. The gasification arch wall 901 is a wall structure made of refractory concrete. Multiple assembly through holes are provided within the gasification arch wall (901), and each assembly through hole is fitted with a water purifier pipe 902. The multiple water purifier pipes 902 are arranged sequentially from left to right. The upper header 903 and the lower header 904 are connected through the multiple water purifier pipes 902. The gasification arch wall 901 can prevent heat loss within the gasification chamber 10. Both the upper header 903 and the lower header 904 are connected to the pipe rack 2, and thus to the furnace body 1. Both the upper header 903 and the lower header 904 can serve to combine and redistribute the working fluid in the water pipe 902, thereby improving the efficiency of water circulation.

[0035] Furthermore, in a preferred embodiment, the upper header 903 includes a first handhole device 9031, a first handhole end cap 9032, a first cylinder 9033, a first end cap 9034, a pressure gauge seat 9035, a first thermometer seat 9036, and an exhaust valve seat 9037. The first handhole end cap 9032 is installed at one end of the first cylinder 9033, and the first handhole device 9031 is installed on the first handhole end cap 9032. The first end cap 9034 is installed at the other end of the first cylinder 9033, and the first end cap 9034 is provided with a first through hole 9038 communicating with the pipe rack 2. The pressure gauge seat 9035, the first thermometer seat 9036, and the exhaust valve seat 9037 are all connected to the side wall of the first cylinder 9033.

[0036] Furthermore, in a preferred embodiment, the lower header 904 includes a second handhole device 9041, a second handhole end cap 9042, a second cylinder 9043, a second end cap 9044, a second thermometer seat 9045, and a drain valve seat 9046. The second handhole end cap 9042 is installed at one end of the second cylinder 9043, and the second handhole device 9041 is installed on the second handhole end cap 9042. The second end cap 9044 is installed at the other end of the second cylinder 9043, and the second end cap 9044 is provided with a second through hole 9047 communicating with the pipe rack 2. The second thermometer seat 9045 and the drain valve seat 9046 are both connected to the side wall of the second cylinder 9043.

[0037] Furthermore, in a preferred embodiment, the gasification arch 901 includes a lower arch 9011, a middle arch 9012, and an upper arch 9013. The lower arch 9011 is vertical, and its outer wall is connected to the fuel hopper 8. The inner wall of the upper arch 9013 is connected to the front ignition arch 101.

[0038] Furthermore, in a preferred embodiment, the included angle between the lower arch wall 9011 and the middle arch wall 9012 is 125°; the included angle between the middle arch wall 9012 and the upper arch wall 9013 is 90°.

[0039] Furthermore, in a preferred embodiment, the front ignition arch 101 is a rearward protruding structure. The main function of the front ignition arch 101 is to absorb the radiant heat from the flame and high-temperature flue gas and concentrate it onto the new fuel, thereby heating and igniting it. The rear arch 501 is a forward protruding structure. The main function of the rear arch 501 is to guide the high-temperature flue gas, and it is a convection type furnace arch. Compared with the rear arch 501, the front ignition arch 101 is shorter and has a steeper slope.

[0040] Furthermore, in a preferred embodiment, both the front and rear sides of the front ignition arch 101 are provided with concrete layers, which can increase the heat insulation effect of the front ignition arch 101.

[0041] Furthermore, in a preferred embodiment, both the front and rear sides of the rear arch 501 are provided with concrete layers, which can increase the heat insulation effect of the rear arch 501.

[0042] Furthermore, in a preferred embodiment, a slag discharge system is provided below the chain grate 4. The rear end of the chain grate 4 and the bottom end of the partition wall water-cooled wall 5 form a slag discharge port. As the chain grate 4 rotates, the ash and slag on the grate plates can fall into the slag discharge system from the slag discharge port.

[0043] Furthermore, in a preferred embodiment, gaps are provided between the grate bars, allowing the relatively fine ash produced after the fuel on the grate bars burns to fall into the slag discharge system through the gaps.

[0044] Furthermore, in a preferred embodiment, a ventilation slot 401 that can be opened and closed independently is provided below the gasification chamber inlet 11 to control the air intake in the gasification chamber 10, thereby adjusting the gasification effect in the gasification chamber.

[0045] Furthermore, in a preferred embodiment, a flag-type heating surface 14 is also included. The flag-type heating surface 14 is installed in the convection flue 7 and is connected to the boiler's water circulation system. By increasing the heating area, the flag-type heating surface 14 enables more heat to be effectively utilized, thereby improving the overall thermal efficiency of the boiler.

[0046] Furthermore, in a preferred embodiment, it also includes a tail flue 15, an economizer 16, and an air preheater 17. The tail flue 15 is connected to the convection flue 7. The economizer 16 and the air preheater 17 are installed in the tail flue 15. The economizer 16 is connected to the tube rack 2. The economizer 16 plays the role of recovering waste heat from the flue gas and heating the boiler feedwater to saturated water under the pressure of the steam drum. It absorbs the heat of the high-temperature flue gas, reduces the exhaust temperature of the flue gas, saves energy, and improves efficiency. The air preheater 16 transfers the heat carried by the flue gas in the tail flue 15 to the externally introduced air through the heat sink, preheats the air to a certain temperature, and then introduces the hot air into the chain grate 4 through the pipe connected to the ventilation slot 401.

[0047] Furthermore, in a preferred embodiment, a boiler drum 18 is also included. The boiler drum 18 is disposed at the top of the furnace body 1 and is connected to the tube rack 2. The function of the boiler drum 18 is to receive water from the economizer 16, perform steam-water separation, supply water to the circulating loop, and deliver saturated steam to users. The boiler drum 18 contains a certain amount of water and has a certain amount of heat and working fluid storage. It can slow down the rate of steam pressure change when operating conditions change, and plays a certain buffering role when the feedwater and load are not coordinated for a short period of time.

[0048] Furthermore, in a preferred embodiment, it also includes a steel frame 19 and a platform ladder 20, which are erected on the outer periphery of the pipe frame 2 and the tail flue 15. The bottom end of the steel frame 19 is fixed to the ground by embedded parts. The steel frame 19 is used to support the platform ladder 20 and the suspended gasification arch 9, which can play a stabilizing role.

[0049] Working principle:

[0050] The boiler typically uses bituminous coal as fuel. Fuel enters the gasification chamber 10 at the front of the furnace 6 via the rotating chain grate 4 from the fuel hopper 3, accumulating to a certain thickness of approximately 350-400 mm. Hot air is introduced from the air preheater 17 in the tail flue 15, passing through multiple ventilation slots 401 on the chain grate 4 from the bottom of the fuel layer upwards. The hot air mixes with the fuel on the fuel layer, which is dried, pyrolyzed, and volatiles are released on the chain grate 4 to form combustible gas. This combustible gas and flue gas enter the furnace 6 through the flue gas outlet window 13 on the front ignition arch 101 for combustion. As the chain grate 4 rotates, the fuel undergoes continuous gasification within the gasification chamber 10. The incomplete combustion loss q3 and solid incomplete combustion loss q4 of the fuel passing through the gasification chamber 10 are both reduced. Oxygen reacts exothermically with the fuel in the oxidation layer, generating sufficient heat to supply the reduction reaction, thus reducing CO2 formation in the fuel. Meanwhile, the chain grate 4 continuously delivers fuel to the furnace 6 for combustion. The flue gas in the furnace 6 enters the convection flue 7 through the flue gas inlet 8, then enters the tail flue 15 after passing through the flag-type heating surface 14, and then passes through the economizer 16 and the air preheater 17 in sequence, before entering the next dust removal process.

[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gasification combustion boiler, characterized in that: The furnace includes a furnace body (1), a tube frame (2), a fuel hopper (3), and a chain grate (4). The furnace body (1) is composed of membrane water-cooled walls on all four sides and the top. The tube frame (2) is arranged on the outer periphery of the furnace body (1) to support the furnace body (1) and connect to the membrane water-cooled walls. The chain grate (4) is installed at the bottom of the furnace body (1). The fuel hopper (3) is installed on the chain grate (4). The chain grate (4) is provided with multiple ventilation slots (40). 1) The interior of the furnace body (1) is provided with a partition wall water-cooled wall (5), which divides the interior of the furnace body (1) into a furnace chamber (6) and a convection flue (7) arranged in front and back. The furnace chamber (6) and the convection flue (7) are connected through a flue gas inlet (8) provided on the upper part of the partition wall water-cooled wall (5). The lower part of the front water-cooled wall of the furnace body (1) is provided with a front ignition arch (101). The lower part of the partition wall water-cooled wall (5) is provided with a rear arch (501). It also includes a gasification arch (9), which is located on the front side of the front ignition arch (101). A gasification chamber (10) is formed between the gasification arch (9) and the front ignition arch (101). The left side of the gasification chamber (10) is closed by the left water-cooled wall of the furnace body (1) and refractory bricks, and the right side of the gasification chamber (10) is closed by the right water-cooled wall of the furnace body (1) and refractory bricks. The bottom end of the gasification arch (9) and the bottom end of the front ignition arch (101) enclose each other. A gasification chamber inlet (11) is formed; a feed inlet (12) is formed between the bottom end of the front ignition arch (101) and the chain grate (4); the fuel hopper (3) is located on the front side of the gasification arch (9), and both the gasification chamber inlet (11) and the feed inlet (12) are connected to the fuel hopper (3); a flue gas outlet window (13) is opened on the upper part of the front ignition arch (101), and the gasification chamber (10) is connected to the furnace (6) through the flue gas outlet window (13).

2. The gasification combustion boiler according to claim 1, characterized in that: The gasification arch (9) includes a gasification arch wall (901), water shed pipes (902), an upper header (903) and a lower header (904). Multiple water shed pipes (902) are embedded in the gasification arch wall (901) and arranged in a left-right direction. The upper header (903) is connected to the top of the multiple water shed pipes (902), and the lower header (904) is connected to the bottom of the multiple water shed pipes (902).

3. The gasification combustion boiler according to claim 2, characterized in that: The upper header (903) includes a first handhole device (9031), a first handhole end cap (9032), a first cylinder (9033), a first end cap (9034), a pressure gauge seat (9035), a first thermometer seat (9036), and an exhaust valve seat (9037). The first handhole end cap (9032) is installed at one end of the first cylinder (9033), and the first handhole device (9031) is installed on the first handhole end cap (9032). The first end cap (9034) is installed at the other end of the first cylinder (9033), and the first end cap (9034) is provided with a first through hole (9038) communicating with the pipe rack (2). The pressure gauge seat (9035), the first thermometer seat (9036), and the exhaust valve seat (9037) are all connected to the side wall of the first cylinder (9033).

4. The gasification combustion boiler according to claim 2 or 3, characterized in that: The lower header (904) includes a second handhole device (9041), a second handhole end cap (9042), a second cylinder (9043), a second end cap (9044), a second thermometer seat (9045), and a drain valve seat (9046). The second handhole end cap (9042) is installed at one end of the second cylinder (9043), and the second handhole device (9041) is installed on the second handhole end cap (9042). The second end cap (9044) is installed at the other end of the second cylinder (9043), and the second end cap (9044) is provided with a second through hole (9047) communicating with the pipe rack (2). The second thermometer seat (9045) and the drain valve seat (9046) are both connected to the side wall of the second cylinder (9043).

5. The gasification combustion boiler according to claim 2, characterized in that: The gasification arch wall (901) includes a lower arch wall (9011), a middle arch wall (9012) and an upper arch wall (9013). The lower arch wall (9011) is vertical, and its outer wall is connected to the fuel hopper (3). The inner wall of the upper arch wall (9013) is connected to the upper part of the front ignition arch (101).

6. The gasification combustion boiler according to claim 1, characterized in that: The front and rear sides of the front ignition arch (101) are both provided with concrete layers.

7. The gasification combustion boiler according to claim 1, characterized in that: The front and rear sides of the rear arch (501) are both provided with concrete layers.

8. The gasification combustion boiler according to claim 1, characterized in that: The rear end of the chain grate (4) and the bottom end of the partition wall water-cooled wall (5) form a slag discharge port.

9. The gasification combustion boiler according to claim 1, characterized in that: It also includes a flag-type heating surface (14), which is installed inside the convection flue (7).

10. The gasification combustion boiler according to claim 1, characterized in that: It also includes a tail flue (15), an economizer (16) and an air preheater (17), wherein the tail flue (15) is connected to the convection flue (7); the economizer (16) and the air preheater (17) are installed in the tail flue (15).

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