High-efficiency lignite combustion device and method based on high-altitude environment

Abstract

The invention provides a lignite efficient combustion device and method based on a high-altitude environment, and relates to the field of lignite combustion, the lignite efficient combustion device comprises a hearth, a cyclone separator communicated with a dilute-phase area in the hearth and an economizer for recycling flue gas waste heat, and a water cooling partition wall is arranged in the hearth; the interior of the hearth is divided into a plurality of combustion chambers by the water-cooling partition walls, and the water-cooling partition walls are provided with connecting air ducts for communicating the combustion chambers with one another; the multiple groups of longitudinal water-cooling partition walls are matched with the transverse water-cooling partition walls to divide the interior of the hearth into the multiple combustion chambers for separated combustion, so that coal particles are mixed in the multiple combustion chambers, flame combustion is achieved in each combustion chamber, the water-cooling walls in each combustion chamber are matched, and the combustion efficiency is improved. And through cooperation of the first air duct, the second air duct and the balance hole, the retention time of the particles in the hearth is prolonged, and then coke burnout is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of lignite combustion, and particularly to a high-efficiency lignite combustion device and method based on a high-altitude environment. Background Art

[0002] Circulating fluidized bed combustion technology has been widely applied worldwide due to its advantages such as high efficiency and energy conservation, easy control of pollutant emissions, and wide fuel adaptability. At present, the parameters of thermal power generating units in various countries have developed from supercritical (25.0 MPa, 540°C - 566°C) to ultra-supercritical (24 - 30.0 MPa, 580°C - 610°C) and above. The power generation efficiency of ultra-supercritical units can reach 45% - 47%, which is 3% - 4% higher than that of supercritical units, further improving the economy. Under high-altitude and low-pressure conditions, lignite combustion and heat transfer are different from those in a conventional environment. The low pressure accelerates the volatilization of fuel particles. Especially for high-volatile lignite, the combustion share in the dense phase region increases. The low-pressure environment also reduces the oxygen concentration, thereby increasing the burnout time of coke. In view of the above problems, the present invention proposes a high-efficiency lignite combustion device and method based on a high-altitude environment to solve the problems existing in the prior art. Summary of the Invention

[0003] In view of the above problems, the present invention proposes a high-efficiency lignite combustion device and method based on a high-altitude environment. The high-efficiency lignite combustion device based on a high-altitude environment divides the interior of the furnace into multiple combustion chambers through multiple groups of longitudinal water-cooled partition walls and transverse water-cooled partition walls for separated combustion, so that coal particles are mixed in multiple combustion chambers, and thus there is flame combustion in each combustion chamber. With the cooperation of the water-cooled walls in each combustion chamber, as well as the first air duct, the second air duct, and the balance holes, the residence time of particles in the furnace is increased, thereby promoting the burnout of coke.

[0004] To achieve the object of the present invention, the present invention is realized through the following technical solutions: A high-efficiency lignite combustion device based on a high-altitude environment, comprising a furnace, a cyclone separator communicating with the dilute-phase region inside the furnace, and an economizer for recycling the waste heat of the flue gas. A water-cooled partition wall is provided inside the furnace. The water-cooled partition wall divides the interior of the furnace into multiple combustion chambers. A communication air duct for communicating between the multiple combustion chambers is provided on the water-cooled partition wall. A balance hole for ensuring the uniformity of gas-solid flow between the multiple combustion chambers is also provided on the water-cooled partition wall. A steam-liquid treatment chamber for transporting and treating steam and liquid is provided at the top of the furnace. Water-cooled walls are provided in multiple groups of the combustion chambers. The input end and the output end of the water-cooled wall are both communicated with the steam-liquid treatment chamber. A platen superheater is provided in the dilute-phase region of the multiple combustion chambers. The input end and the output end of the platen superheater are both communicated with the steam-liquid treatment chamber. A coal feeder is provided in the dense-phase region of the furnace. A burner is provided below the coal feeder. A slag discharge port is provided at the bottom of the furnace. A smoke exhaust pipe is provided at the bottom of the economizer.

[0005] A further improvement lies in that: The water-cooled partition wall comprises a transverse water-cooled wall and a longitudinal water-cooled wall. There is one group of the transverse water-cooled partition walls, and multiple groups of the longitudinal water-cooled partition walls. The multiple groups of longitudinal water-cooled partition walls are vertically arranged with respect to the transverse water-cooled partition wall.

[0006] A further improvement lies in that: The communication air duct comprises a first air duct and a second air duct. The first air duct is distributed on the transverse water-cooled wall, and the second air duct is distributed on the longitudinal water-cooled wall. The positions of the first air duct and the second air duct are staggered in height.

[0007] A further improvement lies in that: There are multiple groups of the balance holes. The multiple groups of balance holes are respectively distributed on the transverse water-cooled wall and the longitudinal water-cooled wall. The number of balance holes on the transverse water-cooled wall is greater than the number of balance holes on the longitudinal water-cooled wall.

[0008] A further improvement lies in that: A mesh grille is also provided in the first air duct and the second air duct. The water-cooled partition wall and the mesh grille are both made of refractory and corrosion-resistant materials.

[0009] A further improvement lies in that: The water-cooled wall is composed of multiple groups of water-cooled rings. The multiple groups of water-cooled rings are spaced 2-5 cm apart and communicate with each other.

[0010] A further improvement lies in that: There are multiple groups of the cyclone separators. The multiple groups of cyclone separators are all located between the furnace and the economizer. The bottoms of the multiple groups of cyclone separators are connected through a rectifying pipe. A return pipe communicating with the combustion chamber is provided at the bottom of the rectifying pipe.

[0011] A further improvement lies in that: a first blower is further provided at the bottom of the cyclone separator, the first blower is connected to the economizer, a first air duct and a second air duct are respectively provided on the first blower, the air outlet of the first air duct is located below the opposite side of the discharge end of the coal feeder, the output end of the first air duct faces the discharge end of the coal feeder, and the second air duct is located above the first air duct.

[0012] A further improvement lies in that: an air supply ring is further provided on the outer wall of the furnace, a second blower is provided on the first blower, a third air duct is provided on the second blower, one end of the third air duct is communicated with the air supply ring, the inner side of the air supply ring is respectively communicated with multiple combustion chambers, and the return pipe penetrates through the third air duct.

[0013] The combustion method using the above-mentioned lignite high-efficiency combustion device based on high-altitude environment includes the following contents; S1. Lignite enters the interior of the furnace through the coal feeder, and the first air duct of the first blower blows air to the lignite entering the interior of the furnace, so that the lignite coal particles float up at the bottom of the furnace. At the same time, the second air duct synchronously blows air into the furnace, so that the lignite coal particles can be mixed with the oxygen in the air, increasing the oxygen content of the fuel. At the same time, the air at the air inlet end of the first blower is preheated by the economizer, so that the air sent into the interior of the furnace dries the flying coal particles, reducing the moisture of the coal particles and increasing the oxygen content inside the fuel. Then the burner starts the ignition work; S2. The water-cooled partition wall divides the interior of the furnace into multiple combustion chambers. The burned flames and flue gases respectively enter the multiple combustion chambers. At the same time, the second blower works to supply air to the multiple combustion chambers respectively, so as to enhance the combustion effect inside each combustion chamber. At the same time, communication channels and balance holes are also provided on the water-cooled partition wall to ensure the uniformity of gas-solid flow inside each combustion chamber in the furnace and increase the residence time of coal particles in the furnace; S3. At the same time, water-cooled walls are arranged as heating elements inside each combustion chamber, and the water-cooled walls are composed of multiple groups of spaced water-cooled rings, so as to increase the contact between each group of water-cooled rings and the flame, and then control the deviation of the heated side of the heating surface and ensure the heating effect of the water-cooled walls; S4. The cyclone separator separates the particles in the flue gas. The flue gas is sent to the economizer for preheating and utilization, and then the shell is sent back into the interior of the furnace for circulating combustion; S5. After the water-cooled wall is heated, the cold water inside boils and evaporates into steam, which is separated and processed by the steam-liquid treatment bin, and the steam is transported to the steam turbine, while the liquid is recycled after cooling.

[0014] The present invention divides the interior of the furnace into multiple combustion chambers through multiple groups of longitudinal water-cooled partition walls and transverse water-cooled partition walls for separated combustion, so that coal particles are mixed in multiple combustion chambers, and thus there is flame combustion in each combustion chamber. In cooperation with the water-cooled walls in each combustion chamber, as well as the cooperation of the first air duct, the second air duct and the balance holes, the residence time of particles in the furnace is increased, thereby promoting the burnout of coke. A stratified combustion mode of high-temperature combustion of volatile matter in the dense phase zone and enhanced burnout of coke in the lean phase zone is adopted to balance combustion efficiency and pollutant control. Description of the Drawings

[0015] Figure 1 is a three-dimensional schematic diagram of the present invention; Figure 2 is a schematic diagram of the position of the platen superheater of the present invention; Figure 3 is a schematic diagram of the structure of the water-cooled wall of the present invention; Figure 4 is a schematic diagram of the structure of the water-cooled partition wall of the present invention.

[0016] Wherein: 1, furnace; 2, cyclone separator; 3, economizer; 4, water-cooled partition wall; 5, combustion chamber; 6, balance hole; 7, vapor-liquid treatment bin; 8, water-cooled wall; 9, platen superheater; 10, coal feeder; 11, burner; 12, slag discharge port; 13, smoke exhaust pipe; 14, transverse water-cooled wall; 15, longitudinal water-cooled wall; 16, first air duct; 17, second air duct; 18, mesh grille; 19, water-cooled ring; 20, rectifier tube; 21, return pipe; 22, first fan; 23, first air delivery pipe; 24, second air delivery pipe; 25, air supply ring; 26, second fan; 27, third air delivery pipe. Detailed Embodiment

[0017] In order to deepen the understanding of the present invention, the following will further elaborate on the present invention in combination with embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0018] According to Figures 1-4As shown in the figure, this embodiment proposes a high-efficiency lignite combustion device based on a high-altitude environment, which includes a furnace 1, a cyclone separator 2 connected to the lean-phase zone inside the furnace 1, and an economizer 3 for reusing the waste heat of the flue gas. A water-cooled partition wall 4 is provided inside the furnace 1. The water-cooled partition wall 4 divides the inside of the furnace 1 into multiple combustion chambers 5. A connecting air duct for communicating between the multiple combustion chambers 5 is provided on the water-cooled partition wall 4. A balance hole 6 for ensuring the uniformity of gas-solid flow between the multiple combustion chambers 5 is also provided on the water-cooled partition wall 4. A steam-liquid treatment chamber 7 for transporting and treating steam and liquid is provided at the top of the furnace 1. Water-cooled walls 8 are provided in multiple groups of the combustion chambers 5. The input end and the output end of the water-cooled wall 8 are both connected to the steam-liquid treatment chamber 7. A platen superheater 9 is also provided in the lean-phase zone of the multiple combustion chambers 5. The input end and the output end of the platen superheater 9 are both connected to the steam-liquid treatment chamber 7. A coal feeder 10 is provided in the dense-phase zone of the furnace 1. A burner 11 is provided below the coal feeder 10. A slag discharge port 12 is provided at the bottom of the furnace 1. A smoke exhaust pipe 13 is provided at the bottom of the economizer 3.

[0019] The water-cooled partition wall 4 divides the inside of the furnace 1 into multiple combustion chambers 5, and the multiple combustion chambers 5 are connected through the connecting air duct. At the same time, the balance hole 6 is provided to ensure the uniformity of gas-solid flow inside each combustion chamber 5, realizing efficient desulfurization in the furnace and reducing the generation of NOx raw emissions. The separately provided water-cooled wall 8 greatly increases the heating area of the water-cooled wall 8, thereby increasing the heating effect and further increasing the generation efficiency of water vapor.

[0020] The water-cooled partition wall 4 includes a horizontal water-cooled wall 14 and a vertical water-cooled wall 15. There is one group of the horizontal water-cooled partition walls 4, and multiple groups of the vertical water-cooled partition walls 4 are provided. The multiple groups of the vertical water-cooled partition walls 4 are vertically arranged with respect to the horizontal water-cooled partition wall 4.

[0021] The connecting air duct includes a first air duct 16 and a second air duct 17. The first air duct 16 is distributed on the horizontal water-cooled wall 14, and the second air duct 17 is distributed on the vertical water-cooled wall 15. The positions of the first air duct 16 and the second air duct 17 are staggered in height.

[0022] Multiple groups of the balance holes 6 are provided. The multiple groups of the balance holes 6 are respectively distributed on the horizontal water-cooled wall 14 and the vertical water-cooled wall 15. The number of the balance holes 6 on the horizontal water-cooled wall 14 is greater than the number of the balance holes 6 on the vertical water-cooled wall 15.

[0023] The furnace 1 is divided into multiple combustion chambers 5 by multiple groups of longitudinal water-cooled partition walls 4 and transverse water-cooled partition walls 4 for separated combustion, so that the coal particles are mixed in the multiple combustion chambers 5, and thus there is flame combustion in each combustion chamber 5. In cooperation with the water-cooled wall 8 in each combustion chamber 5, as well as the cooperation of the first air duct 16, the second air duct 17 and the balance holes 6, the residence time of the particles in the furnace 1 is increased, thereby promoting the burnout of coke. A hierarchical combustion mode of high-temperature combustion of volatile matter in the dense phase zone and enhanced burnout of coke in the lean phase zone is adopted to balance the combustion efficiency and pollutant control.

[0024] The first air duct 16 and the second air duct 17 are also provided with mesh grilles 18. The water-cooled partition walls 4 and the mesh grilles 18 are both made of refractory and corrosion-resistant materials, further increasing the residence time of the shell inside the furnace body.

[0025] The water-cooled wall 8 is composed of multiple groups of water-cooled rings 19. The multiple groups of water-cooled rings 19 are spaced 2-5 cm apart and communicate with each other.

[0026] By increasing the heat absorption area of the water-cooled rings 19, the heat exchange rate inside the water-cooled wall 8 is made faster, and at the same time, the deviation of the heated side of the heating surface is controlled to ensure the heating effect of the water-cooled wall 8.

[0027] There are multiple groups of the cyclone separators 2. The multiple groups of cyclone separators 2 are all located between the furnace 1 and the economizer 3. The bottoms of the multiple groups of cyclone separators 2 are connected through a rectifying pipe 20, and a return pipe 21 communicating with the combustion chamber 5 is provided at the bottom of the rectifying pipe 20.

[0028] The bottom of the cyclone separator 2 is also provided with a first blower 22. The first blower 22 is connected to the economizer 3. The first blower 22 is respectively provided with a first air delivery pipe 23 and a second air delivery pipe 24. The air outlet of the first air delivery pipe 23 is located below the opposite side of the discharge end of the coal feeder 10, and the output end of the first air delivery pipe 23 faces the discharge end of the coal feeder 10. The second air delivery pipe 24 is located above the first air delivery pipe 23.

[0029] The first air delivery pipe 23 of the first blower 22 blows air to the lignite entering the interior of the furnace 1, so that the lignite coal particles float up at the bottom of the furnace 1. At the same time, the second air delivery pipe 24 synchronously blows air into the furnace 1, so that the lignite coal particles can be fully mixed with the oxygen in the air. At the same time, the air at the air inlet end of the first blower 22 is preheated by the economizer 3. The air inlet pipe of the first blower 22 can be arranged to penetrate through the economizer 3 to preheat the air in the pipe, so that the air sent into the interior of the furnace 1 dries the floating coal particles, reduces the moisture of the coal particles. At the same time, for ensuring safety, the air inlet rate should be appropriately controlled.

[0030] On the outer wall of the furnace chamber 1, there is also an air supply ring 25 provided. On the first blower 22, there is a second blower 26 provided. On the second blower 26, there is a third air duct 27 provided. One end of the third air duct 27 communicates with the air supply ring 25. The inner side of the air supply ring 25 communicates with multiple combustion chambers 5 respectively. The return pipe 21 penetrates through the third air duct 27. When the second blower 26 operates, air is respectively supplied to the multiple combustion chambers 5, thereby increasing the combustion effect inside each combustion chamber 5 and further increasing the burnout effect of the coke.

[0031] The combustion method using the above-mentioned lignite high-efficiency combustion device based on high-altitude environment includes the following contents; S1. The lignite enters the interior of the furnace chamber 1 through the coal feeder 10. The first air duct 23 of the first blower 22 blows air to the lignite entering the interior of the furnace chamber 1, so that the lignite coal particles float up at the bottom of the furnace chamber 1. At the same time, the second air duct 24 synchronously blows air into the furnace chamber 1, so that the lignite coal particles can be fully mixed with the oxygen in the air. At the same time, the air at the air inlet end of the first blower 22 is preheated by the economizer 3, so that the air sent into the interior of the furnace chamber 1 dries the flying coal particles, reduces the moisture of the coal particles, and then the burner 11 performs the ignition work; S2. The water-cooled partition wall 4 divides the interior of the furnace chamber 1 into multiple combustion chambers 5. The burned flames and flue gases respectively enter the multiple combustion chambers 5. At the same time, the second blower 26 operates to supply air to the multiple combustion chambers 5 respectively, thereby increasing the combustion effect inside each combustion chamber 5. At the same time, the water-cooled partition wall 4 is also provided with a communication channel and balance holes 6 to ensure the uniformity of gas-solid flow in each combustion chamber 5 inside the furnace chamber 1 and increase the residence time of the coal particles inside the furnace chamber 1; S3. At the same time, water-cooled walls 8 are arranged inside each combustion chamber 5 as heat-receiving components, and the water-cooled walls 8 are composed of multiple groups of spaced water-cooled rings 19, so as to increase the contact between each group of water-cooled rings 19 and the flames, and then control the deviation of the heat-receiving side of the heat-receiving surface and ensure the heat-receiving effect of the water-cooled walls 8; S4. The cyclone separator 2 separates the particles in the flue gas. The flue gas is sent to the economizer 3 for preheating and utilization, and then the shell is sent back into the interior of the furnace chamber 1 for cyclic combustion; S5. After the water-cooled walls 8 are heated, the cold water inside boils and evaporates to generate steam, which is separated and processed by the steam-liquid treatment bin 7, and the steam is transported to the steam turbine. The liquid is cooled and then recycled.

[0032] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency lignite combustion device based on a high-altitude environment, comprising a furnace (1), a cyclone separator (2) connected to a dilute phase region inside the furnace (1), and an economizer (3) for recycling waste heat of flue gas, characterized in that: The furnace (1) is provided with a water-cooled partition wall (4) inside, the water-cooled partition wall (4) divides the furnace (1) into a plurality of combustion chambers (5), the water-cooled partition wall (4) is provided with a connecting air duct for interconnecting the plurality of combustion chambers (5), the water-cooled partition wall (4) is also provided with a balancing hole (6) for ensuring uniformity of gas-solid flow between the plurality of combustion chambers (5), the top of the furnace (1) is provided with a vapor-liquid processing chamber (7) for conveying and processing vapor and liquid, and the plurality of groups of the combustion chambers (5) are each provided with a water-cooled partition wall (4). The water-cooled wall (8) is provided with a water-cooled wall (8), the input end and the output end of the water-cooled wall (8) are both connected to the vapor-liquid processing bin (7), the dilute phase area of ​​the plurality of combustion chambers (5) is further provided with a screen-type superheater (9), the input end and the output end of the screen-type superheater (9) are both connected to the vapor-liquid processing bin (7), the dense phase area of ​​the furnace (1) is provided with a coal feeder (10), a burner (11) is provided below the coal feeder (10), a slag discharge port (12) is provided at the bottom of the furnace (1), and a smoke exhaust pipe (13) is provided at the bottom of the economizer (3).

2. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 1 is characterized in that: The water-cooling partition wall (4) comprises a transverse water-cooling wall (14) and a longitudinal water-cooling wall (15), wherein the transverse water-cooling partition wall (4) is provided with one group, and the longitudinal water-cooling partition wall (4) is provided with a plurality of groups, and the plurality of groups of longitudinal water-cooling partition walls (4) are vertically arranged between the transverse water-cooling partition walls (4).

3. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 1 is characterized in that: The connecting air duct comprises a first air duct (16) and a second air duct (17); the first air duct (16) is distributed on the transverse water-cooling wall (14); the second air duct (17) is distributed on the longitudinal water-cooling wall (15); and the positions of the first air duct (16) and the second air duct (17) are staggered in height.

4. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 1 is characterized in that: The balancing holes (6) are provided in a plurality of groups, and the plurality of groups of balancing holes (6) are respectively distributed on the transverse water-cooling wall (14) and the longitudinal water-cooling wall (15), and the number of the balancing holes (6) located on the transverse water-cooling wall (14) is greater than the number of the balancing holes (6) on the longitudinal water-cooling wall (15).

5. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 3 is characterized in that: A mesh grille (18) is also provided in the first air duct (16) and the second air duct (17); the water-cooling partition wall (4) and the mesh grille (18) are both made of fire-resistant and corrosion-resistant materials.

6. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 1 is characterized in that: The water-cooled wall (8) is composed of multiple groups of water-cooled rings (19), and the multiple groups of water-cooled rings (19) are spaced 2-5 cm apart and are interconnected.

7. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 1 is characterized in that: The cyclone separators (2) are provided in a plurality of groups, and the plurality of groups of cyclone separators (2) are all located between the furnace (1) and the economizer (3). The bottoms of the plurality of groups of cyclone separators (2) are connected via a rectifying tube (20), and a return tube (21) communicating with the combustion chamber (5) is provided at the bottom of the rectifying tube (20).

8. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 7 is characterized in that: A first fan (22) is also provided at the bottom of the cyclone separator (2). The first fan (22) is connected to the economizer (3). A first air delivery pipe (23) and a second air delivery pipe (24) are respectively provided on the first fan (22). The air outlet of the first air delivery pipe (23) is located below the opposite side of the discharge end of the coal feeder (10). The output end of the first air delivery pipe (23) faces the discharge end of the coal feeder (10). The second air delivery pipe (24) is located above the first air delivery pipe (23).

9. The high-efficiency lignite combustion device based on a high-altitude environment according to claim 8, characterized in that: An air supply ring (25) is also provided on the outer wall of the furnace (1); a second fan (26) is provided on the first fan (22); a third air supply pipe (27) is provided on the second fan (26); one end of the third air supply pipe (27) is connected to the air supply ring (25); the inner side of the air supply ring (25) is connected to a plurality of combustion chambers (5); and the return pipe (21) is arranged to pass through the third air supply pipe (27).

10. A combustion method of a high-efficiency lignite combustion device based on a high-altitude environment according to claims 1-9, characterized in that: Include the following: S1. Lignite enters the furnace (1) through the coal feeder (10), and the first air delivery pipe (23) of the first fan (22) blows air toward the lignite entering the furnace (1), so that the lignite particles float at the bottom of the furnace (1). At the same time, the second air delivery pipe (24) simultaneously blows air into the furnace (1), so that the lignite particles can mix with oxygen in the air, thereby increasing the oxygen content of the fuel. At the same time, the air at the air inlet end of the first fan (22) is preheated by the economizer (3), so that the air sent into the furnace (1) dries the flying coal particles, reduces the moisture content of the coal particles, and increases the oxygen content in the fuel. Then, the burner (11) performs ignition operation; S2, the water-cooled partition wall (4) divides the interior of the furnace (1) into a plurality of combustion chambers (5), and the flames and smoke after combustion enter the plurality of combustion chambers (5) respectively. At the same time, the second fan (26) works to supply air to the plurality of combustion chambers (5), thereby increasing the combustion effect inside each combustion chamber (5). At the same time, a communication channel and a balance hole (6) are provided on the water-cooled partition wall (4) to ensure the uniformity of gas-solid flow in each combustion chamber (5) inside the furnace (1), and at the same time increase the retention time of coal particles inside the furnace (1); S3. At the same time, a water-cooled wall (8) is arranged inside each combustion chamber (5) as a heat receiving part, and the water-cooled wall (8) is composed of a plurality of groups of spaced water-cooled rings (19), thereby increasing the contact between each group of water-cooled rings (19) and the flame, thereby controlling the deviation of the heated side of the heated surface, and ensuring the heating effect of the water-cooled wall (8); S4, the cyclone separator (2) separates the particles in the flue gas, the flue gas is sent to the economizer (3) for preheating, and the shell is then sent to the furnace (1) for circulating combustion; S5. After the water-cooled wall (8) is heated, the cold water inside boils and evaporates into steam, which is separated and processed in the steam-liquid treatment chamber (7) and transported to the steam turbine. The liquid is cooled and recycled.

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