A flue gas waste heat recovery device and a gasification slag activation furnace waste heat recovery method

Abstract

The present application relates to heat exchange equipment technical field, disclose a kind of flue gas waste heat recovery equipment and gasification slag activation furnace waste heat recovery method, including shell, air inlet pipe and air outlet pipe installed in the shell outside, heat exchange pipe installed in the shell inside, the flow rate sensor is fixedly installed in the shell air inlet end, the flow rate sensor is used to detect exhaust gas flow rate, the heat exchange pipe is close to the side of air inlet direction and is provided with wind baffle assembly, the wind baffle assembly includes cross bar and multiple sub-mother board groups and regulator being evenly installed on cross bar.The present application is provided with wind baffle assembly, when exhaust gas flow rate is faster, preliminary shielding exhaust gas using sub-mother board group in air inlet end, so that exhaust gas flow rate reduces, in turn reduces the wear and tear of exhaust gas to heat exchange pipe, prolongs the service life of heat exchange pipe, in addition, the wind baffle area of sub-mother board group can be adjusted using regulator, so as to adapt to exhaust gas of different flow rate, ensure that exhaust gas of different flow rate can finally be reduced to within reasonable threshold.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, specifically to a flue gas waste heat recovery device and a waste heat recovery method for a gasification slag activation furnace. Background Technology

[0002] Gasification slag is a solid waste generated during coal gasification, mainly composed of inorganic minerals and residual carbonaceous particles from the coal. During coal gasification, coal is converted into combustible gases, but not all coal is completely converted; the unconverted portion forms gasification slag. The gasification slag generates a large amount of waste gas when processed in an activation furnace. Recovering the waste heat from this waste gas is a crucial measure that combines economic, environmental, and operational benefits. Currently, heat exchangers are the primary method for waste heat recovery from gasification slag activation furnace waste gas. A heat exchanger, also known as a heat transfer device, is a device that transfers heat between two or more fluids, or between a fluid and a solid. Its core function is to achieve efficient heat transfer without mixing the media. It is widely used in almost all industrial sectors, including chemical, petroleum, refrigeration, food, and pharmaceutical industries. Heat exchangers can recover the heat energy from the gasification slag activation furnace waste gas, achieving energy savings.

[0003] There are certain problems with the heat exchanger during use: the hard fly ash particles carried in the high-speed flowing exhaust gas from the gasification slag activation furnace will continuously scour the heat exchange tube bundle, especially the windward side, causing wear on the heat exchange tube bundle, which in turn leads to mechanical wear and thinning of the tube wall, and ultimately leakage. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a waste heat recovery device for flue gas and a waste heat recovery method for gasification slag activation furnaces. It has advantages such as reducing heat exchange tube wear and energy saving, and solves the problem of wear caused by particles in the high-speed gasification slag activation furnace waste gas scouring the heat exchange tubes when recovering waste heat from the waste gas of the gasification slag activation furnace.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a flue gas waste heat recovery device, comprising a shell, an inlet pipe and an outlet pipe installed outside the shell, and a heat exchange pipe installed inside the shell. A flow rate sensor is fixedly installed at the inlet end of the shell for detecting the exhaust gas flow rate. A wind baffle assembly is provided on the side of the heat exchange pipe near the inlet direction. The wind baffle assembly includes a crossbar, multiple mother-daughter plate assemblies evenly installed on the crossbar, and an regulator. The mother-daughter plate assemblies are used to shield the exhaust gas, and the regulator is used to adjust the shielding area of ​​the mother-daughter plate assemblies. A flow guiding cavity is provided in the mother-daughter plate assemblies. The flow guiding cavities on the multiple mother-daughter plate assemblies are connected in series through a pipe assembly. The two ends of the pipe assembly are connected to the inlet pipe and the outlet pipe.

[0006] When exhaust gas enters the casing, the flow rate sensor detects the intake airflow speed. When the flow rate is too fast, the mother and daughter plate assembly blocks the exhaust gas to slow down the exhaust gas flow rate. When the flow rate changes, the regulator operates and pushes to adjust the blocking area of ​​the mother and daughter plate assembly to adapt to the windproof requirements under different wind speeds.

[0007] While the mother and daughter plate assembly blocks the exhaust gas, the heat from the mother and daughter plates is also conducted to the flow guide cavity, thereby recovering the heat from the mother and daughter plate assembly.

[0008] Preferably, there are two crossbars fixed to the inner wall of the outer casing. Multiple evenly distributed fixing rings are fixed on the crossbars. The mother-daughter plate assembly is arranged between two adjacent fixing rings. The mother-daughter plate assembly includes a base shaft. Two symmetrically arranged strip plates are rotatably connected to the base shaft. Each of the two strip plates has a movable ring hinged to its edge away from the base shaft. The movable ring is movably sleeved on the crossbar. A return spring is fixed between the movable ring and the fixing ring. The return spring is sleeved on the crossbar.

[0009] Preferably, the regulator includes an electric push rod and a base rod. The base rod is simultaneously fixed to the base shaft on multiple mother-daughter plate assemblies. The electric push rod is fixed to the inner wall of the housing. The extension and retraction directions of the electric push rod are perpendicular to the base rod. The output end of the electric push rod is fixedly connected to the base rod.

[0010] Preferably, the flow guiding cavity is disposed within the strip plate, and the pipe assembly includes a lower connecting pipe, an upper connecting pipe, an inlet branch pipe, and an outlet branch pipe. Multiple lower connecting pipes are configured and matched with each mother-daughter plate assembly. Both ends of the lower connecting pipe are fixed to the bottom ends of two flow guiding cavities on the same mother-daughter plate assembly. Multiple upper connecting pipes are configured, and both ends of the upper connecting pipe are fixed to the top ends of flow guiding cavities on two adjacent mother-daughter plate assemblies. One end of the inlet branch pipe is connected to the inlet pipe, and the other end of the inlet branch pipe is fixed to the top end of the flow guiding cavity on the leftmost mother-daughter plate assembly. One end of the outlet branch pipe is connected to the outlet pipe, and the other end of the outlet branch pipe is fixed to the top end of the flow guiding cavity on the rightmost mother-daughter plate assembly.

[0011] Preferably, the outer casing is further provided with a dust removal assembly, which is used to clean the mother and daughter board assembly. The dust removal assembly includes a soot blower and an output pipe, and the output pipe is connected to the soot blower through a telescopic pipe.

[0012] Preferably, the soot blower is fixed to the outside of the housing, the output end of the soot blower is fixed with a main pipe, one end of the main pipe extends into the housing, the output pipe is U-shaped, the two ends of the output pipe face downward and extend to both sides of the mother and daughter plate assembly, and the output pipe is provided with a plurality of nozzles facing the mother and daughter plate assembly.

[0013] Preferably, the telescopic tube includes an outer sleeve and an inner sleeve, the inner sleeve and the outer sleeve are movably connected, the top end of the outer sleeve is rotatably connected to the end of the main pipe, and the bottom end of the inner sleeve is rotatably connected to the bottom end of the output pipe.

[0014] Preferably, a slide rail is fixed to the inner top wall of the housing, the slide rail is distributed parallel to the crossbar, a slider is slidably connected to the slide rail, the slider is fixed to the top of the output tube, a screw is rotatably connected inside the slide rail, the screw passes through the slider and is threadedly connected to the slider, a motor is fixed to the outside of the housing, and the output shaft of the motor is fixed to the end of the screw.

[0015] Preferably, a guide rail is fixed to the bottom wall of the outer casing, and a roller is fixed to the end of the connecting pipe, the roller matching the guide rail.

[0016] The present invention also discloses a method for recovering waste heat from a gasification slag activation furnace, which uses the aforementioned flue gas waste heat recovery equipment.

[0017] Compared with the prior art, the present invention provides a flue gas waste heat recovery device and a waste heat recovery method for a gasification slag activation furnace, which has the following beneficial effects:

[0018] 1. This type of flue gas waste heat recovery equipment and waste heat recovery method for gasification slag activation furnace, by setting up a wind baffle assembly, when the exhaust gas flow rate of the gasification slag activation furnace is relatively fast, uses the mother and daughter plate assembly to initially block the exhaust gas at the air inlet, thereby reducing the exhaust gas flow rate and reducing the wear of the heat exchange tubes on the heat exchange tubes, extending the service life of the heat exchange tubes. In addition, the wind baffle area of ​​the mother and daughter plate assembly can be adjusted by the regulator to adapt to the exhaust gas flow rate of the gasification slag activation furnace at different speeds, ensuring that the exhaust gas flow rate of the gasification slag activation furnace at different speeds can ultimately be reduced to within a reasonable threshold.

[0019] 2. This type of flue gas waste heat recovery equipment and waste heat recovery method for gasification slag activation furnace, by setting up a lower connecting pipe, an upper connecting pipe, an inlet branch pipe, an outlet branch pipe, and a guide cavity, can form a passage. The temperature of the exhaust gas from the gasification slag activation furnace is conducted to the connecting plate, lower connecting pipe, upper connecting pipe, inlet branch pipe, and outlet branch pipe. The low-temperature medium in the passage absorbs heat and rises in temperature, thereby realizing the waste heat recovery of the windbreak component. On the one hand, it can avoid the reduction of service life after the mother and daughter plate assembly is continuously heated, and on the other hand, it can recover and utilize heat, making it more energy-efficient.

[0020] 3. This type of flue gas waste heat recovery equipment and waste heat recovery method for gasification slag activation furnace, by setting up a dust removal component, is conducive to removing dust from the mother and daughter plate assembly, avoiding the reduction of the thermal conductivity of the mother and daughter plate assembly due to dust adhesion, facilitating maintenance, and improving the service life of the dust removal component. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the flue gas waste heat recovery device of the present invention. Figure 1 ;

[0022] Figure 2 This is a three-dimensional structural diagram of the flue gas waste heat recovery device of the present invention. Figure 2 ;

[0023] Figure 3 This is a cross-sectional view of the flue gas waste heat recovery device of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the windshield assembly of the present invention. Figure 1 ;

[0025] Figure 5 This is a three-dimensional structural diagram of the windshield assembly of the present invention. Figure 2 ;

[0026] Figure 6 For the present invention Figure 5 Enlarged view of part A;

[0027] Figure 7 This is a schematic diagram of the structure of the mother-daughter plate assembly of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the dust removal component of the present invention;

[0029] Figure 9 For the present invention Figure 8 Enlarged view of part B.

[0030] In the diagram: 1. Outer shell; 2. Inlet pipe; 3. Outlet pipe; 4. Heat exchanger pipe; 5. Flow sensor; 6. Baffle assembly; 7. Crossbar; 71. Fixing ring; 8. Mother and daughter plate assembly; 81. Guide cavity; 82. Strip plate; 83. Movable ring; 84. Return spring; 85. Base shaft; 9. Regulator; 91. Electric push rod; 92. Base rod; 10. Pipe assembly; 101. Lower connecting pipe; 102. Upper connecting pipe; 103. Inlet branch pipe; 104. Outlet branch pipe; 11. Soot removal assembly; 111. Soot blower; 112. Output pipe; 113. Telescopic pipe; 1131. Outer sleeve; 1132. Inner sleeve; 114. Main pipe; 115. Nozzle; 116. Slide rail; 117. Slider; 118. Screw; 119. Motor; 120. Guide rail; 121. Roller. Detailed Implementation

[0031] 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.

[0032] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a flue gas waste heat recovery device and a waste heat recovery method for a gasification slag activation furnace.

[0033] Example 1: Please refer to Figures 1-7 A flue gas waste heat recovery device includes a shell 1, an inlet pipe 2 and an outlet pipe 3 installed outside the shell 1, and a heat exchange pipe 4 installed inside the shell 1. A flow rate sensor 5 is fixedly installed at the inlet end of the shell 1. The flow rate sensor 5 is used to detect the flow rate of the waste gas from the gasification slag activation furnace. A wind baffle assembly 6 is provided on the side of the heat exchange pipe 4 near the inlet direction. The wind baffle assembly 6 includes a crossbar 7 and multiple mother-daughter plate assemblies 8 evenly installed on the crossbar 7, as well as an regulator 9. The mother-daughter plate assemblies 8 are used to shield the waste gas from the gasification slag activation furnace, and the regulator 9 is used to adjust the shielding area of ​​the mother-daughter plate assemblies 8. A flow guiding cavity 81 is provided in the mother-daughter plate assemblies 8. The flow guiding cavities 81 on the multiple mother-daughter plate assemblies 8 are connected in series through a pipe assembly 10. The two ends of the pipe assembly 10 are connected to the inlet pipe 2 and the outlet pipe 3.

[0034] When the exhaust gas from the gasification slag activation furnace enters the outer shell 1, the flow rate sensor 5 detects the inlet flow rate. When the flow rate is too fast, the mother and daughter plate assembly 8 blocks the exhaust gas from the gasification slag activation furnace to slow down the exhaust gas flow rate. When the flow rate changes, the regulator 9 operates and pushes to adjust the blocking area of ​​the mother and daughter plate assembly 8 to adapt to the windproof requirements under different wind speeds.

[0035] While the mother-daughter plate assembly 8 blocks the exhaust gas from the gasification slag activation furnace, the heat from the mother-daughter plate is also conducted to the guide cavity 81, thereby recovering the heat from the mother-daughter plate assembly 8.

[0036] The outer shell 1 has an air inlet and an air outlet at its two ends, and the heat exchange tubes 4 are arranged in multiple sets and evenly distributed inside the outer shell 1. The two ends of the heat exchange tubes 4 are connected to the air inlet pipe 2 and the air outlet pipe 3, respectively.

[0037] During operation, the exhaust gas from the gasification slag activation furnace enters the outer shell 1 through the inlet. As it passes through the heat exchange tube 4, heat is transferred to the heat exchange tube 4, achieving heat recovery. At the same time, the flow rate sensor 5 detects the flow rate of the exhaust gas from the gasification slag activation furnace at the inlet. When the high-speed exhaust gas from the gasification slag activation furnace enters the interior of the outer shell 1, it first contacts multiple mother-daughter plate assemblies 8. The mother-daughter plate assemblies 8 obstruct the airflow, thus reducing the flow rate of the exhaust gas from the gasification slag activation furnace. The reduced flow rate of the exhaust gas from the gasification slag activation furnace causes less wear on the heat exchange tube 4. When the flow rate of the exhaust gas from the gasification slag activation furnace changes, the regulator 9 is activated. The regulator 9 controls the shielding area of ​​the mother-daughter plate assemblies 8, thereby changing the windproofing effect to adapt to different flow rates of exhaust gas from the gasification slag activation furnace, so that exhaust gas from the gasification slag activation furnace at different flow rates can be slowed down to within a reasonable threshold.

[0038] By setting up the wind baffle assembly 6, when the exhaust gas flow rate of the gasification slag activation furnace is relatively fast, the mother and daughter plate assembly 8 is used to initially block the exhaust gas at the air inlet, thereby reducing the exhaust gas flow rate and reducing the wear of the exhaust gas on the heat exchange tube 4, thus extending the service life of the heat exchange tube 4. In addition, the wind baffle area of ​​the mother and daughter plate assembly 8 can be adjusted by the regulator 9 to adapt to the exhaust gas of the gasification slag activation furnace with different flow rates, ensuring that the exhaust gas of different flow rates can eventually be reduced to within a reasonable threshold.

[0039] Example 2: See Figures 1-9 Unlike the above embodiments, the crossbar 7 is provided as two and fixed to the inner wall of the outer shell 1. Multiple evenly distributed fixing rings 71 are fixed on the crossbar 7. The mother-daughter plate assembly 8 is arranged between two adjacent fixing rings 71. The mother-daughter plate assembly 8 includes a base shaft 85. Two symmetrically arranged strip plates 82 are rotatably connected to the base shaft 85. The edges of the two strip plates 82 away from the base shaft 85 are hinged with movable rings 83. The movable rings 83 are movably sleeved on the crossbar 7. A return spring 84 is fixed between the movable ring 83 and the fixing rings 71. The return spring 84 is sleeved on the crossbar 7.

[0040] In the initial state, the two corresponding movable rings 83 abut against each other under the action of the return spring 84. At this time, the included angle between the two strip plates 82 on the base shaft 85 is 10 degrees. At this time, the windward area is the smallest and the blocking effect on the exhaust gas of the gasification slag activation furnace is the worst.

[0041] When in use, the exhaust gas from the gasification slag activation furnace enters the interior of the outer shell 1 through the inlet end and first contacts the connecting plate on the mother and daughter plate assembly 8, thereby achieving the wind resistance effect. The exhaust gas from the gasification slag activation furnace is blocked and the flow rate is reduced, which reduces the wear of impurities in the exhaust gas on the heat exchange tube 4 when it subsequently contacts the heat exchange tube 4.

[0042] Example 3, see Figures 1-9Unlike the above embodiments, the regulator 9 includes an electric push rod 91 and a base rod 92. The base rod 92 is simultaneously fixed to the base shaft 85 on multiple mother-daughter plate assemblies 8. The electric push rod 91 is fixed to the inner wall of the outer shell 1. The extension and retraction direction of the electric push rod 91 is perpendicular to the base rod 92. The output end of the electric push rod 91 is fixedly connected to the base rod 92.

[0043] The base rod 92 is parallel to the crossbar 7. The electric push rod 91 is set in two sets and fixed to both ends of the base rod 92 respectively. When in use, the electric push rod 91 extends and drives the base rod 92 to move. When the base rod 92 moves, it simultaneously pushes the base shaft 85 on multiple mother and daughter plate groups 8 to move. At this time, the base shaft 85 moves closer to the crossbar 7. The two connecting plates on the base shaft 85 tilt synchronously and symmetrically. When the connecting plates tilt, they drive the movable ring 83 to slide on the crossbar 7 and compress the return spring 84. The included angle between the two connecting plates increases, thereby increasing the windproof area and thus adapting to the higher flow rate of the gasification slag activation furnace exhaust gas. When the electric push rod 91 retracts, the base rod 92 returns to its original position. The elastic force of the return spring 84 pushes the movable ring 83 to return to its original position, thereby reducing the included angle between the two connecting plates and decreasing the windproof area, thus adapting to the lower flow rate of the gasification slag activation furnace exhaust gas.

[0044] By setting regulator 9, it is beneficial to change the included angle between the two connecting plates, thereby changing the windbreak area to adapt to the windbreak requirements of the gasification slag activation furnace exhaust gas with different flow rates.

[0045] Example 4, see Figures 1-9 Unlike the above embodiments, the flow guiding cavity 81 is set inside the strip plate 82. The pipe group 10 includes a lower connecting pipe 101, an upper connecting pipe 102, an air inlet branch pipe 103, and an air outlet branch pipe 104. The lower connecting pipe 101 is configured in multiple ways and matches each mother and daughter plate group 8. The two ends of the lower connecting pipe 101 are respectively fixed to the bottom ends of two flow guiding cavities 81 on the same mother and daughter plate group 8. The upper connecting pipe 102 is configured in multiple ways. The two ends of the upper connecting pipe 102 are respectively fixed to the top ends of the flow guiding cavities 81 on two adjacent mother and daughter plate groups 8. One end of the air inlet branch pipe 103 is connected to the air inlet pipe 2, and the other end of the air inlet branch pipe 103 is fixed to the top end of the flow guiding cavity 81 on the leftmost mother and daughter plate group 8. One end of the air outlet branch pipe 104 is connected to the air outlet pipe 3, and the other end of the air outlet branch pipe 104 is fixed to the top end of the flow guiding cavity 81 on the rightmost mother and daughter plate group 8.

[0046] The lower connecting pipe 101, upper connecting pipe 102, air inlet branch pipe 103, and air outlet branch pipe 104 are all made of metal flexible hoses. The lower connecting pipe 101, upper connecting pipe 102, air inlet branch pipe 103, air outlet branch pipe 104, and the guide cavity 81 on the connecting plate form a passage. During use, the temperature of the exhaust gas from the gasification slag activation furnace is conducted to the connecting plate, lower connecting pipe 101, upper connecting pipe 102, air inlet branch pipe 103, and air outlet branch pipe 104. The low-temperature medium in the passage absorbs heat and rises in temperature, thereby realizing the waste heat recovery of the windbreak assembly 6. On the one hand, it can avoid the service life of the mother and daughter plate assembly 8 from continuous heating, and on the other hand, it can recover and utilize heat, making it more energy-efficient.

[0047] Example 5, see Figures 1-9 Unlike the above embodiments, the outer casing 1 is further provided with a dust removal assembly 11, which is used to clean the mother-daughter plate assembly 8. The dust removal assembly 11 includes a soot blower 111 and an output pipe 112. The output pipe 112 is connected to the soot blower 111 via a telescopic pipe 113. The soot blower 111 is fixed to the outside of the outer casing 1, and a main pipe 114 is fixed to the output end of the soot blower 111. One end of the main pipe 114 extends into the outer casing 1. The output pipe 112 is U-shaped, with both ends pointing downwards and extending to both sides of the mother-daughter plate assembly 8. The output pipe 112 is provided with multiple nozzles 115 facing the mother-daughter plate assembly 8. The telescopic pipe 113 includes an outer sleeve 1131 and an inner sleeve 1132. The inner sleeve 1132 is connected to the outer sleeve 1131. The sleeve 1131 is movably inserted, and the top end of the outer sleeve 1131 is rotatably connected to the end of the main pipe 114. The bottom end of the inner sleeve 1132 is rotatably connected to the bottom end of the output pipe 112. A slide rail 116 is fixed on the inner top wall of the outer shell 1. The slide rail 116 is distributed parallel to the crossbar 7. A slider 117 is slidably connected on the slide rail 116. The slider 117 is fixed to the top of the output pipe 112. A screw 118 is rotatably connected inside the slide rail 116. The screw 118 passes through the slider 117 and is threadedly connected to the slider 117. A motor 119 is fixed on the outside of the outer shell 1. The output shaft of the motor 119 is fixed to the end of the screw 118. A guide rail 120 is fixed on the inner bottom wall of the outer shell 1. A roller 121 is fixed to the end of the connecting pipe. The roller 121 matches the guide rail 120.

[0048] The soot blower 111 operates on the principle of steam cleaning. Steam flows through the telescopic pipe 113, the output pipe 112, and the nozzle 115. The connections between the outer sleeve 1131 and the inner sleeve 1132, the inner sleeve 1132 and the output pipe 112, and the outer sleeve 1131 and the main pipe 114 are all sealed. The roller 121 can roll along the guide rail 120, thus supporting the moving connecting pipe. In use, the regulator 9 is activated to adjust the shielding area of ​​the mother-daughter plate assembly 8 to its maximum. Then, the soot blower 111 operates, and steam flows through... The nozzle 115 sprays out to blow soot on both sides of the mother and daughter plate assembly 8. At the same time, the motor 119 is started. The motor 119 drives the screw 118 to rotate. When the screw 118 rotates, it drives the slider 117 to move. When the slider 117 moves, it drives the output pipe 112 to move, so that the nozzle 115 passes through each mother and daughter plate assembly 8 in sequence to clean the different mother and daughter plate assemblies 8. When the output pipe 112 moves, it drives the bottom end of the inner sleeve 1132 to move, which in turn causes the telescopic pipe 113 to extend and swing, so that the soot blowing medium can be continuously transported through the inside of the telescopic pipe 113.

[0049] By setting up the dust removal component 11, it is easier to remove dust from the mother and daughter board assembly 8, avoid the reduction of thermal conductivity of the mother and daughter board assembly 8 due to dust adhesion, facilitate maintenance, and improve the service life of the dust removal component 11.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas waste heat recovery device, comprising a shell (1), an inlet pipe (2) and an outlet pipe (3) installed outside the shell (1), and a heat exchange pipe (4) installed inside the shell (1), characterized in that: A flow rate sensor (5) is fixedly installed at the air inlet end of the outer shell (1). The flow rate sensor (5) is used to detect the exhaust gas flow rate. A wind baffle assembly (6) is provided on the side of the heat exchange tube (4) near the air inlet direction. The wind baffle assembly (6) includes a crossbar (7) and multiple mother-daughter plate groups (8) evenly installed on the crossbar (7) and an regulator (9). The mother-daughter plate groups (8) are used to block the exhaust gas. The regulator (9) is used to adjust the blocking area of ​​the mother-daughter plate groups (8). A flow guide cavity (81) is provided in the mother-daughter plate group (8). The flow guide cavities (81) on the multiple mother-daughter plate groups (8) are connected in series through a pipe group (10). The two ends of the pipe group (10) are connected to the air inlet pipe (2) and the air outlet pipe (3). When exhaust gas enters the casing (1), the flow rate sensor (5) detects the intake air flow rate. When the flow rate is too fast, the mother and daughter plate assembly (8) blocks the exhaust gas to slow down the exhaust gas flow rate. When the flow rate changes, the regulator (9) operates and pushes to adjust the blocking area of ​​the mother and daughter plate assembly (8) to adapt to the wind blocking requirements under different wind speeds. While the mother-daughter plate assembly (8) blocks the exhaust gas, the heat of the mother-daughter plate is also conducted to the flow guide cavity (81), thereby recovering the heat on the mother-daughter plate assembly (8). The crossbar (7) is set as two and fixed to the inner wall of the outer shell (1). Multiple evenly distributed fixing rings (71) are fixed on the crossbar (7). The mother and daughter plate assembly (8) is set between two adjacent fixing rings (71). The mother and daughter plate assembly (8) includes a base shaft (85). Two symmetrically arranged strip plates (82) are rotatably connected on the base shaft (85). The edges of the two strip plates (82) away from the base shaft (85) are hinged with movable rings (83). The movable rings (83) are movably sleeved on the crossbar (7). A return spring (84) is fixed between the movable ring (83) and the fixing ring (71). The return spring (84) is sleeved on the crossbar (7). The regulator (9) includes an electric push rod (91) and a base rod (92). The base rod (92) is simultaneously fixed to the base shaft (85) on multiple mother-daughter plate assemblies (8). The electric push rod (91) is fixed to the inner wall of the outer shell (1). The extension and retraction direction of the electric push rod (91) is perpendicular to the base rod (92). The output end of the electric push rod (91) is fixedly connected to the base rod (92). The flow guide cavity (81) is set inside the strip plate (82). The pipe assembly (10) includes a lower connecting pipe (101), an upper connecting pipe (102), an air inlet branch pipe (103), and an air outlet branch pipe (104). Multiple lower connecting pipes (101) are configured and matched with each mother-daughter plate assembly (8). The two ends of the lower connecting pipe (101) are respectively fixed to the bottom ends of two flow guide cavities (81) on the same mother-daughter plate assembly (8). Multiple upper connecting pipes (102) are configured. The two ends of the upper connecting pipe (102) are respectively fixed to the top of the guide cavity (81) on the two adjacent mother and daughter plate groups (8). One end of the air inlet branch pipe (103) is connected to the air inlet pipe (2), and the other end of the air inlet branch pipe (103) is fixed to the top of the guide cavity (81) on the leftmost mother and daughter plate group (8). One end of the air outlet branch pipe (104) is connected to the air outlet pipe (3), and the other end of the air outlet branch pipe (104) is fixed to the top of the guide cavity (81) on the rightmost mother and daughter plate group (8). The lower connecting pipe (101), upper connecting pipe (102), inlet branch pipe (103) and outlet branch pipe (104) are all made of metal flexible hoses. The lower connecting pipe (101), upper connecting pipe (102), inlet branch pipe (103), outlet branch pipe (104) and the guide cavity (81) on the connecting plate form a passage. When in use, the temperature of the exhaust gas is conducted to the connecting plate, lower connecting pipe (101), upper connecting pipe (102), inlet branch pipe (103) and outlet branch pipe (104). The low temperature medium in the passage absorbs heat and rises in temperature, thereby realizing the waste heat recovery of the windshield assembly (6).

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The outer shell (1) is also provided with a dust removal component (11), which is used to clean the mother and daughter board assembly (8). The dust removal component (11) includes a soot blower (111) and an output pipe (112). The output pipe (112) is connected to the soot blower (111) through a telescopic pipe (113).

3. The flue gas waste heat recovery device according to claim 2, characterized in that: The soot blower (111) is fixed outside the outer shell (1). The output end of the soot blower (111) is fixed with a main pipe (114). One end of the main pipe (114) extends into the outer shell (1). The output pipe (112) is U-shaped. Both ends of the output pipe (112) face downward and extend to both sides of the mother-daughter plate assembly (8). The output pipe (112) is provided with multiple nozzles (115) facing the mother-daughter plate assembly (8).

4. The flue gas waste heat recovery device according to claim 3, characterized in that: The telescopic tube (113) includes an outer tube (1131) and an inner tube (1132). The inner tube (1132) is movably inserted into the outer tube (1131). The top end of the outer tube (1131) is rotatably connected to the end of the main pipe (114). The bottom end of the inner tube (1132) is rotatably connected to the bottom end of the output pipe (112).

5. The flue gas waste heat recovery device according to claim 4, characterized in that: A slide rail (116) is fixed to the inner top wall of the outer shell (1). The slide rail (116) is parallel to the crossbar (7). A slider (117) is slidably connected on the slide rail (116). The slider (117) is fixed to the top of the output tube (112). A screw (118) is rotatably connected inside the slide rail (116). The screw (118) passes through the slider (117) and is threadedly connected to the slider (117). A motor (119) is fixed to the outside of the outer shell (1). The output shaft of the motor (119) is fixed to the end of the screw (118).

6. A method for recovering waste heat from a gasification slag activation furnace, characterized in that: The waste heat recovery method for the gasification slag activation furnace uses a flue gas waste heat recovery device as described in any one of claims 1-5.

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