Coal-fired boiler water wall furnace section coupling gasification equipment

Abstract

This invention discloses a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, comprising a gasifier and fluidized beds. The gasifier has an upper feed pipe at its top, and at least three circumferentially evenly distributed side feed pipes tangentially connected to its outer periphery. A gas collecting ring box is fitted around the gasifier, with one end of each side feed pipe connected to the top of the ring box. At least three fluidized beds located below the ring box are arranged around the outer periphery of the gasifier, and a discharge pipe is fixed to the top of each fluidized bed. In this invention, by incorporating the ring box, annular rotating plate, inclined blades, and vents, the raw coal gas transmitted from the multiple fluidized beds surrounding the gasifier is buffered, ensuring that the airflow pressure entering the gasifier through the four side feed pipes is approximately the same. This stabilizes the swirling flow within the gasifier, resulting in a more stable flame, smaller temperature fluctuations, and ultimately, more complete gasification of the raw coal gas.

Description

Technical Field

[0001] This invention relates to the field of coal particle carbonization technology, and more particularly to a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler. Background Technology

[0002] The core function of water-cooled fireplace segmented coupled gasification in coal-fired boilers is to achieve coal carbon conversion to produce gasified gas, which can be used for chemical synthesis or power generation. Existing water-cooled fireplace segmented coupled gasification equipment typically includes two stages in the gasification process. The first stage is preheating to form high-temperature raw coal gas. The second stage involves partial ignition and supplemental heating of the high-temperature raw coal gas to further increase its temperature, promote its complete pyrolysis, and allow it to fully react with the gasifying agent to convert it into high-purity gasified gas.

[0003] For example, in the prior art, the invention patent with publication number CN106221814B proposes a segmented coupled gasification device and method for a water-cooled fireplace for low-quality coal, which relates to the field of clean energy coal gasification technology. It solves the problems of existing gasification devices, such as poor material adaptability, low load adaptability, high oxygen consumption, low carbon conversion rate, difficulty in scaling up, thin and uneven slag film, need for a backup furnace, high initial investment and operating costs, and an unadjustable H2 / CO ratio. The gasification device of this invention includes a feeding device, a double-vortex rapid fluidized bed, a gasification gas circulation pump, a cyclone gasifier, a water cooling system, a quencher, and a slag crusher. The gasification method of this invention decouples a single-stage gasification into two-stage gasification processes: pyrolysis and carbon conversion, which are then coupled in series. The double-vortex rapid fluidized bed is specifically used for fluidizing, crushing, and pyrolyzing solid particulate materials in the low-temperature stage to form raw coal gas. The cyclone gasifier is specifically used for weakly swirling, burning, and gasifying the raw coal gas in the high-temperature stage to achieve carbon conversion. This invention is mainly used for clean, efficient, economical, and reliable staged coupled gasification of low-melting-point inferior coal, biomass, and their mixtures. This patent document discloses the processing technology and equipment structure of the two-stage coupled gasification, which is also the mainstream application structure in the current industry.

[0004] However, the aforementioned existing technologies still have significant shortcomings: the raw coal gas generated by the dual-vortex rapid fluidized bed is directly introduced into the cyclone gasifier via pipeline, without a buffer and pressure stabilization structure between the two. When the outlet pressures of multiple dual-vortex rapid fluidized beds around the cyclone gasifier are inconsistent, the raw coal gas entering the furnace tangentially will create a pressure difference, causing turbulence in the swirling field inside the furnace. This leads to instability in the combustion conditions of the top small flame burner, making it prone to flameout, backfire, or even flameout. Once the burner goes out, the cyclone gasifier loses its core heat source, and the furnace temperature drops rapidly, causing a significant drop in carbon conversion rate. At the same time, the solid particles entrained in the raw coal gas lack a crushing and dissipation structure in the transportation path, making it prone to particle sedimentation and incomplete pyrolysis of the material, further reducing the overall carbon conversion efficiency.

[0005] Therefore, this invention proposes a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler. Summary of the Invention

[0006] The purpose of this invention is to provide a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler includes a gasifier and fluidized beds. The gasifier has an upper feed pipe at its top, and at least three circumferentially evenly distributed side feed pipes tangentially connected to its outer peripheral wall. A gas collecting ring box is fitted around the gasifier, with one end of each side feed pipe communicating with the top of the ring box. At least three fluidized beds located below the ring box are arranged around the outer periphery of the gasifier, and a discharge pipe is fixed to the top of each fluidized bed. The bottom of the gas collecting ring box is open, and a coaxial annular rotating plate is fitted inside the gas collecting ring box. An inclined blade is installed through the ring of the annular rotating plate. A ventilation port with an inclined surface opposite to the inclined blade is opened through the surface of the annular rotating plate. A rotating shaft is installed in the middle of the fluidizing tank. Several circumferentially evenly distributed spiral blades are fixedly fitted on the rotating shaft. A filter screen is fixed inside the fluidizing tank between the rotating shaft and the discharge pipe. At least three inlet pipes near the bottom are fixed on the outer wall of the fluidizing tank.

[0008] As a further description of the above technical solution: One end of the top of the inclined blade is fixed to a lower inclined plate whose free end is located above the adjacent inclined blade, and a collision strip is fixed to the bottom of the lower inclined plate.

[0009] As a further description of the above technical solution: The two side walls of the gas collecting ring box are respectively provided with an inner ring groove and an outer ring groove. The inner edge and outer edge of the annular rotating plate are located in the inner ring groove and the outer ring groove, respectively. At least three circumferentially evenly distributed positioning blocks are fixed on the outer edge of the annular rotating plate. Rollers are provided on one side and the upper and lower sides of the positioning blocks.

[0010] As a further description of the above technical solution: A double-headed cone is fixed in the middle of the fluidizing tank, and the spiral blade passes through the middle of the double-headed cone. The outer edge of the spiral blade is approximately in contact with the inner circumferential wall of the fluidizing tank and the double-headed cone.

[0011] As a further description of the above technical solution: A limiting sleeve is fixedly fitted on the top of the rotating shaft, a cantilever is fixed to the outer peripheral wall of the limiting sleeve, and a wire brush is fixed to the top wall of the cantilever.

[0012] As a further description of the above technical solution: A servo motor is fixed to the bottom of the fluidizing tank via a slotted seat, and the output shaft of the servo motor is fixedly connected to the bottom of the rotating shaft.

[0013] As a further description of the above technical solution: An eccentric housing is fixed to the outer wall of the side feed pipe. A drive shaft is installed inside the eccentric housing and is rotatably connected to the eccentric housing. A blade is fixed to the outer peripheral wall of the drive shaft and is located in the cavity formed by the eccentric housing and the side feed pipe. A ring is installed inside the annular rotating plate and is rotatably connected to the annular rotating plate. A drive wheel is fixed to the top of the drive shaft, located above the eccentric housing and abutting against the ring.

[0014] As a further description of the above technical solution: The outer circumference of the transmission wheel is fixedly fitted with a rubber sleeve, and the outer circumference of the ring is fixedly fitted with a rubber ring that contacts the rubber sleeve.

[0015] As a further description of the above technical solution: The gasifier is fitted with a positioning sleeve, which is fitted inside the ring and the two are rotatably connected. The outer peripheral wall of the positioning sleeve is fixedly connected to the top wall of the gas collecting ring box through the arm.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by setting up a gas collecting ring box, annular rotating plate, inclined blade plate and ventilation port, the raw coal gas transmitted to the gasifier from multiple fluidizing tanks surrounding the gasifier can be buffered, so that the airflow pressure entering the gasifier from the four side feed pipes is approximately the same, thereby stabilizing the swirling flow in the gasifier, making the flame in the furnace more stable, and reducing temperature fluctuations, thus ensuring that the raw coal gas is fully gasified.

[0017] 2. In this invention, by setting inclined blades, lower inclined plates, rotating shafts and spiral blades, the coal particles in the fluidized tank and the coal particles entering the gasifier can be further crushed, accelerating the complete pyrolysis of coal particles, while reducing the amount of sedimentation and improving carbon conversion efficiency.

[0018] 3. In this invention, an eccentric housing, a drive shaft, and a ring are provided so that the airflow in the four side feed pipes can be mechanically stabilized. As a result, this equipment can cope with sudden changes in the system's gas supply pressure, making the swirling flow in the gasifier 1 more stable and reliable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, as proposed in this invention. Figure 2 for Figure 1 A diagram at the bottom; Figure 3 This is a schematic diagram of the annular rotating plate of a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, as proposed in this invention. Figure 4 for Figure 3 A diagram at the bottom; Figure 5 for Figure 3 A magnified view of the "b" in the middle; Figure 6 for Figure 3 A magnified view of the "c" in the middle; Figure 7 This is a schematic diagram of the internal structure of the fluidizing tank of a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, as proposed in this invention. Figure 8 for Figure 7 A schematic diagram after the filter screen has been removed; Figure 9 for Figure 1 A magnified view of the "a" in the middle; Figure 10 This is a schematic diagram of the eccentric housing, drive shaft, and side feed pipe connection of a segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, as proposed in this invention.

[0020] Legend: 1. Gasifier; 11. Upper feed pipe; 12. Side feed pipe; 121. Eccentric housing; 2. Gas collecting ring box; 21. Inner ring groove; 22. Outer ring groove; 3. Discharge pipe; 4. Annular rotating plate; 41. Ventilation port; 5. Inclined blade; 51. Lower inclined plate; 511. Collision bar; 6. Rotating shaft; 7. Spiral blade; 8. Filter screen; 9. Fluidized tank; 91. Inlet pipe; 92. Double-headed cone; 93. Channel seat; 101. Positioning block; 1011. Rotating roller; 101. Positioning block; 102. Limiting sleeve; 1021. Cantilever; 103. Wire brush; 104. Servo motor; 105. Drive shaft; 1051. Blade; 1052. Drive wheel; 10521. Rubber sleeve; 106. Ring; 1061. Rubber ring; 107. Positioning sleeve; 108. Arm. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Please see Figure 1-10A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler is disclosed. Carbonization gasification processes are required in fields such as biomass and microbial hydrogen production, biomass power generation, biomass fuel heating, and biomass gas production and supply. Carbonization gasification is typically produced using this device, which includes a gasifier 1 and a fluidizing tank 9. In the first stage, the fluidizing tank 9 provides a coupling chamber for the gasifying agent and coal particles, forming raw coal gas within the coupling chamber. In the second stage, the raw coal gas and gasifying agent are introduced into the gasifier 1, which further gasifies the coupling chamber. During gasification coupling in the gasifier 1, a portion of the raw coal gas needs to be ignited, resulting in a combustion flame zone at the top of the gasifier 1. This raises the temperature required for gasification coupling within the gasifier 1. A water-cooled wall (coil structure) is fixedly installed on the inner wall of the gasifier 1 to regulate the temperature within the gasifier 1.

[0024] The gasifier 1 is equipped with an upper feed pipe 11 at its top, which introduces a portion of the raw coal gas into the top of the gasifier 1. An igniter at the top of the gasifier 1 ignites this portion of raw coal gas, forming the necessary flame for heating. At least three circumferentially evenly distributed side feed pipes 12 are tangentially connected to the outer wall of the gasifier 1. These side feed pipes 12 tangentially introduce another portion of raw coal gas into the gasifier 1, causing the raw coal gas to swirl within the gasifier 1. A gasifying agent inlet near the center is fixed to the outer wall of the gasifier 1. A certain amount of gasifying agent is introduced into the gasifier 1 through this inlet and couples with the raw coal gas. When the flame combustion is stable, the coupling between the raw coal gas and the gasifying agent is more efficient and complete.

[0025] In this technical solution, a gas collecting ring box 2 is fitted around the gasifier 1. The gas collecting ring box 2 serves as a transfer box for raw coal gas. One end of the side feed pipe 12 is connected to the top of the gas collecting ring box 2. In this embodiment, there are four side feed pipes 12. At least three fluidizing tanks 9 are arranged around the outer periphery of the gasifier 1, located below the gas collecting ring box 2. In this embodiment, there are five fluidizing tanks 9, four of which are arranged around the outer periphery of the gasifier 1. A discharge pipe 3 is fixed to the top of the fluidizing tank 9. The discharge pipe 3 and the gas collecting ring box 2 are connected to the gas collecting ring box 2. The bottom of the ring box 2 is connected, and the raw coal gas in the four fluidized tanks 9 enters the gas collecting ring box 2 through the corresponding discharge pipes 3. When the gas collecting ring box 2 mixes the raw coal gas from the four fluidized tanks 9, it is then introduced into the gasifier 1 through the four side feed pipes 12. The gas collecting ring box 2 acts as a transition buffer box between the four fluidized tanks 9 and the gasifier 1. When the pressure of the raw coal gas output from the four fluidized tanks 9 is different, the gas collecting ring box 2 can greatly reduce the pressure difference, so that the pressure difference of the raw coal gas transmitted in the four side feed pipes 12 is smaller.

[0026] Furthermore, a coaxial annular rotating plate 4 is fitted inside the air collecting ring box 2. The annular rotating plate 4 rotates within the air collecting ring box 2. An inclined blade 5 is threaded through the annular rotating plate 4. The angle of inclination of the inclined blade 5 relative to the horizontal plane is controlled at 8-12 degrees. The inner and outer side walls of the inclined blade 5 are approximately in contact with two opposing arc-shaped side walls of the inner annular cavity of the air collecting ring box 2. Here, "approximately in contact" means that the gap between the inclined blade 5 and the opposing arc-shaped side walls inside the air collecting ring box 2 is extremely small, for example, 0.1-0. The annular rotating plate 4 has a vent 41 that is perpendicular to the inclined surface of the inclined blade 5. The high-pressure raw coal gas entering from the bottom of the gas collecting ring box 2 passes through the vent 41 and impacts the lower inclined surface of the inclined blade 5. Then it flows into the upper part of the inclined blade 5 and forms a vortex. The inclined blade 5 drives the annular rotating plate 4 to rotate under the action of wind. The multiple revolving inclined blades 5 make the vortex of raw coal gas in the gas collecting ring box 2 more uniform, thereby further reducing the pressure difference of raw coal gas transmitted in the four side feed pipes 12.

[0027] The aforementioned specific implementation structure of the rotatable annular rotating plate 4 is as follows: the two side walls of the gas collecting ring box 2 are respectively provided with an inner annular groove 21 and an outer annular groove 22. The inner edge and outer edge of the annular rotating plate 4 are located in the inner annular groove 21 and the outer annular groove 22, respectively. At least three circumferentially evenly distributed positioning blocks 101 are fixed on the outer edge of the annular rotating plate 4. Rotating rollers 1011 are provided on one side and on the upper and lower sides of the positioning block 101. The rotating roller 1011 on one side of the positioning block 101 abuts against the inner circumferential wall of the outer annular groove 22. The rotating rollers 1011 on the upper and lower sides abut against the upper and lower side walls of the outer annular groove 22, respectively. With the support of the rotating rollers 1011, the annular rotating plate 4 can rotate smoothly. The rotating rollers 1011 are made of high temperature resistant material.

[0028] It should be noted that when the raw coal gas entering the gas collecting ring box 2 impacts the inclined blade 5, the tiny particles in the raw coal gas will collide with the inclined blade 5. After the impact, the tiny particles will be further broken down and refined. The broken and refined particles flow more uniformly and the pyrolysis is more efficient.

[0029] Furthermore, one end of the top of the inclined blade 5 is fixed to the lower inclined plate 51 located above the adjacent inclined blade 5 at the free end. The angle of the lower inclined plate 51 relative to the horizontal plane is controlled at 3-5 degrees. The bottom of the lower inclined plate 51 is fixed with a collision strip 511. During the process of the raw coal gas flowing upward through the ventilation port 41, the inclined blade 5 and the lower inclined plate 51 will cause the particles in the raw coal gas to undergo secondary impacts in sequence, thereby further refining the particles in the raw coal gas.

[0030] A rotating shaft 6 is located in the center of the fluidizing tank 9. Several circumferentially evenly distributed spiral blades 7 are fixedly sleeved on the rotating shaft 6, and a spiral channel is formed between two adjacent spiral blades 7. A filter screen 8 is fixed inside the fluidizing tank 9 between the rotating shaft 6 and the discharge pipe 3. The filter screen 8 is used to filter coal particles, so that coal particles with a particle size smaller than the filter screen 8 can pass through the filter screen 8. At least three inlet pipes 91 are fixed on the outer wall of the fluidizing tank 9 near the bottom. One inlet pipe 91 is used to introduce gas and coal particles, another inlet pipe 91 is used to introduce gasifying agent, and the last inlet pipe 91 is used to introduce part of the gasified gas after carbon conversion in the gasifier 1. Coal particles and gasifying agent flow in the spiral channel inside the fluidizing tank 9 to form a spiral swirling airflow. This flow mode prevents coal particles from settling and thus prevents coking blockage at the bottom of the fluidizing tank 9. When the rotating shaft 6 rotates, the spiral blades 7 increase the impact force on the coal particles in the spiral channel. This arrangement has the effect of breaking up coal particles and reducing the filtration load on the filter screen 8.

[0031] Among them, the top of the rotating shaft 6 is fixedly fitted with a limiting sleeve 102, the outer peripheral wall of the limiting sleeve 102 is fixed with a cantilever 1021, and the top wall of the cantilever 1021 is fixed with a wire brush 103. When the wire brush 103 revolves, it can scrape the filter screen 8, which can effectively prevent the filter screen 8 from clogging.

[0032] In this embodiment, a double-headed cone 92 is fixed in the middle of the fluidizing tank 9. The spiral blade 7 passes through the middle of the double-headed cone 92. The outer edge of the spiral blade 7 is approximately in contact with the inner circumferential wall of the fluidizing tank 9 and the double-headed cone 92. The function of the double-headed cone 92 is to enable the coal particles and gasifying agent mixture flowing in the spiral channel to re-aggregate and disperse, so that the density distribution of the raw coal gas formed after passing through the filter screen 8 is more uniform.

[0033] In this embodiment, a servo motor 104 is fixed to the bottom of the fluidizing tank 9 via a slotted seat 93. The output shaft of the servo motor 104 is fixedly connected to the bottom of the rotating shaft 6, and the rotation of the rotating shaft 6 is driven and controlled by the servo motor 104.

[0034] Because the gas pressure of each fluidizing tank 9 is affected by the system gas pressure, the discharged raw coal gas may experience sudden pressure changes. This can easily lead to sudden pressure differences in the gas flow transmitted through the four side feed pipes 12. To avoid the problem of unstable swirl in the gasifier 1 caused by this sudden pressure change, in this embodiment, an eccentric housing 121 is fixed to the outer wall of the side feed pipe 12. The inner cavity of the eccentric housing 121 is connected to the inner cavity of the side feed pipe 12. A drive shaft 105 is installed inside the eccentric housing 121. The axis of the drive shaft 105 is perpendicular to and does not intersect with the axis of the side feed pipe 12. The drive shaft 105 and the eccentric housing 121 are rotatably connected. Blades 1051 are fixed to the outer peripheral wall of the drive shaft 105 and are located in the cavity formed by the eccentric housing 121 and the side feed pipe 12. Raw coal gas flows through the side feed pipe 12. The blades 1051 are pushed, and the blades 1051 rotate when they move. A ring 106 is provided inside the annular rotating plate 4. The ring 106 and the annular rotating plate 4 are rotatably connected. A transmission wheel 1052 is fixed on the top of the transmission shaft 105, located above the eccentric housing 121 and abutting against the ring 106. When the ring 106 rotates, the rotational angular velocity of the transmission wheel 1052 that abuts against it is approximately equal. This makes the flow rate of raw coal gas in the four side feed pipes 12 more stable and the pressure difference approximately zero, making the swirl in the gasifier 1 more stable and the combustion more stable.

[0035] In this embodiment, a rubber sleeve 10521 is fixedly sleeved on the outer periphery of the transmission wheel 1052, and a rubber ring 1061 that contacts the rubber sleeve 10521 is fixedly sleeved on the outer periphery of the ring 106. When the transmission wheel 1052 rotates, the extrusion friction between the rubber sleeve 10521 and the rubber ring 1061 is used to drive the ring 106 to rotate.

[0036] The gasifier 1 is fitted with a positioning sleeve 107, which is fitted inside the ring 106 and the two are rotatably connected. The outer peripheral wall of the positioning sleeve 107 is fixedly connected to the top wall of the gas collecting ring box 2 through the arm 108.

[0037] Working principle: During operation, the control shaft 6 rotates, and the spiral blades 7 rotate. Under the action of air pressure, the coal particles in the fluidizing tank 9 swirl upwards along the spiral channel between adjacent spiral blades 7. As the coal particles swirl upwards in the spiral channel, they will collide with the side wall of the spiral blades 7. After the collision, the coal particles are broken up. The gasifying agent and coal particles in the fluidizing tank 9 form raw coal gas. The raw coal gas in one of the fluidizing tanks 9 passes through the filter screen 8 and enters the upper feed pipe 11. The raw coal gas in the four fluidizing tanks 9 around the gasifier 1 enters the gas collecting ring box 2. The raw coal gas in the lower part of the gas collecting ring box 2 passes through the ventilation port 41 and continues to swirl. The coal particles in the raw coal gas continue to collide with the inclined blades 5 and the lower inclined blades. Plate 51, and the annular rotating plate 4 rotate under the action of wind. When the exhaust pressure of the four fluidizing tanks 9 around the gasifier 1 changes, the swirling and converging effect of the gas collecting ring box 2 makes the pressure of the airflow entering the four side feed pipes 12 approximately equal. After the airflow in the four side feed pipes 12 enters the gasifier 1 tangentially, it can form a stable swirling flow. During this process, the blades 1051 are pushed, the drive shaft 105 rotates, and the ring 106 is driven to rotate. Under the restriction of the ring 106, the rotational angular velocity of the four drive shafts 105 is approximately equal, which can mechanically regulate the pressure of the four side feed pipes 12, so that the airflow and pressure in the four side feed pipes 12 are approximately the same.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler, comprising a gasifier (1) and a fluidizing tank (9), wherein an upper feed pipe (11) is provided at the top of the gasifier (1), and at least three circumferentially evenly distributed side feed pipes (12) are tangentially connected to the outer peripheral wall of the gasifier (1), characterized in that, The gasifier (1) is fitted with a gas collecting ring box (2) on its outside. One end of the side feed pipe (12) is connected to the top of the gas collecting ring box (2). At least three fluidizing tanks (9) located below the gas collecting ring box (2) are arranged around the outer periphery of the gasifier (1). A discharge pipe (3) is fixed to the top of the fluidizing tank (9). The discharge pipe (3) is connected to the bottom of the gas collecting ring box (2). A coaxial annular rotating plate (4) is fitted inside the gas collecting ring box (2). The annular rotating plate (4) has a ring body on its ring body. An inclined blade (5) is provided through the fluidizing tank (9). A ventilation opening (41) is provided through the surface of the annular rotating plate (4) and is opposite to the inclined surface of the inclined blade (5). A rotating shaft (6) is provided in the middle of the fluidizing tank (9). Several spiral blades (7) are fixedly sleeved on the rotating shaft (6). A filter screen (8) is fixed inside the fluidizing tank (9) between the rotating shaft (6) and the discharge pipe (3). At least three inlet pipes (91) are fixed on the outer wall of the fluidizing tank (9) near the bottom.

2. The segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 1, characterized in that, One end of the top of the inclined blade (5) is fixed to a lower inclined plate (51) located above the adjacent inclined blade (5) at its free end, and a collision strip (511) is fixed to the bottom of the lower inclined plate (51).

3. The segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 1, characterized in that, The two side walls of the gas collecting ring box (2) are respectively provided with an inner ring groove (21) and an outer ring groove (22). The inner edge and outer edge of the annular rotating plate (4) are located in the inner ring groove (21) and the outer ring groove (22) respectively. At least three circumferentially evenly distributed positioning blocks (101) are fixed on the outer edge of the annular rotating plate (4). Rotating rollers (1011) are provided on one side and on the upper and lower sides of the positioning block (101).

4. The segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 1, characterized in that, A double-headed cone (92) is fixed in the middle of the fluidizing tank (9). The spiral blade (7) passes through the middle of the double-headed cone (92). The outer edge of the spiral blade (7) is approximately in contact with the inner circumferential wall of the fluidizing tank (9) and the double-headed cone (92).

5. A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 1, characterized in that, The top of the rotating shaft (6) is fixedly fitted with a limiting sleeve (102), and a cantilever (1021) is fixed to the outer peripheral wall of the limiting sleeve (102). A wire brush (103) is fixed to the top wall of the cantilever (1021).

6. The segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 1, characterized in that, The bottom of the fluidizing tank (9) is fixed with a servo motor (104) via a slotted seat (93), and the output shaft of the servo motor (104) is fixedly connected to the bottom of the rotating shaft (6).

7. A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 1, characterized in that, An eccentric housing (121) is fixed to the outer wall of the side feed pipe (12). A drive shaft (105) is provided inside the eccentric housing (121). The drive shaft (105) and the eccentric housing (121) are rotatably connected. A blade (1051) is fixed to the outer peripheral wall of the drive shaft (105) in the cavity formed by the eccentric housing (121) and the side feed pipe (12). A ring (106) is provided inside the annular rotating plate (4). The ring (106) and the annular rotating plate (4) are rotatably connected. A drive wheel (1052) is fixed to the top of the drive shaft (105), located above the eccentric housing (121) and abutting against the ring (106).

8. A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 7, characterized in that, The outer periphery of the transmission wheel (1052) is fixedly fitted with a rubber sleeve (10521), and the outer periphery of the ring (106) is fixedly fitted with a rubber ring (1061) that contacts the rubber sleeve (10521).

9. A segmented coupled gasification device for a water-cooled fireplace in a coal-fired boiler according to claim 7, characterized in that, The gasifier (1) is fitted with a positioning sleeve (107) on its outside. The positioning sleeve (107) is fitted inside the ring (106) and the two are rotatably connected. The outer peripheral wall of the positioning sleeve (107) is fixedly connected to the top wall of the gas collecting ring box (2) through the arm (108).

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