A flue gas waste heat utilization system for thermal power plants

Abstract

The present invention discloses a flue gas waste heat utilization system for a thermal power plant, which relates to the technical field of flue gas treatment, and comprises a boiler, a first flue gas exhaust pipe, a spray desulfurization component, a second flue gas exhaust pipe and a chimney which are connected in series in sequence; the first flue gas exhaust pipe is externally sheathed with a first heat exchange sleeve, the second flue gas exhaust pipe is externally sheathed with a second heat exchange sleeve, and the first heat exchange sleeve and the second heat exchange sleeve are connected with a first circulation pipe and a second circulation pipe; the spray desulfurization component comprises: a spray bin, a side of which is connected with the first flue gas exhaust pipe through an air inlet, and a top of which is connected with the second flue gas exhaust pipe through an air outlet, and spray liquid is also pre-installed in the spray bin; an air equalizing plate which is fixedly embedded in the interior of the spray bin, and a plurality of air equalizing holes are distributed on the surface of the air equalizing plate; a thermal control air plate group which is arranged below the air equalizing plate and above the air inlet; a spray pipe which is embedded in the spray bin, and the system can fully utilize the flue gas waste heat and has a good spraying effect.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, in particular to a flue gas waste heat utilization system for a thermal power plant. Background Art

[0002] In the operation process of thermal power plants, flue gas waste heat is a valuable secondary energy resource. Its efficient recovery and utilization is not only the key to improving overall power generation efficiency and reducing operating costs, but also has immeasurable value in reducing environmental pollution and promoting green production. However, looking at the flue gas waste heat utilization system currently equipped in thermal power plants, it is not difficult to find that it still faces many challenges and shortcomings in actual operation.

[0003] Specifically, although existing systems have widely adopted advanced technical means such as heat exchange sleeves to capture and utilize waste heat in flue gas, they are often difficult to achieve ideal heat transfer efficiency due to unreasonable heat exchange structure design, imperfect heat exchange logic planning, and omissions in operation and maintenance management, resulting in some valuable waste heat not being fully converted and utilized, causing energy waste.

[0004] On the other hand, spray desulfurization is a key step in purifying flue gas and controlling sulfur oxide emissions in thermal power plants. Its efficiency is directly related to whether environmental protection standards are met and the improvement of environmental quality. Unfortunately, existing spray desulfurization components often encounter bottleneck problems such as insufficient mixing of spray liquid and flue gas, low utilization efficiency of desulfurizer, and unreasonable layout of gas equalization plates resulting in uneven distribution of flue gas flow during operation. These factors have restricted the further optimization and improvement of desulfurization effects.

[0005] In view of this, exploring ways to utilize flue gas waste heat to enhance the spray desulfurization effect has become a direction worthy of research.

[0006] Therefore, it is necessary to provide a flue gas waste heat utilization system for a thermal power plant to solve the above problems. Summary of the invention

[0007] To solve the above problems, the present invention provides the following technical solutions: A flue gas waste heat utilization system for a thermal power plant, comprising a boiler, a first flue gas exhaust pipe, a spray desulfurization component, a second flue gas exhaust pipe, and a chimney connected in series in sequence;

[0008] The first smoke exhaust pipe is externally sheathed with a first heat exchange sleeve, the second smoke exhaust pipe is externally sheathed with a second heat exchange sleeve, and the first heat exchange sleeve and the second heat exchange sleeve are connected with a first circulation pipe and a second circulation pipe, so that the liquid in the first heat exchange sleeve, the second heat exchange sleeve, the first circulation pipe and the second circulation pipe circulates;

[0009] Wherein, the spray desulfurization component comprises:

[0010] A spray chamber, the side of which is connected to the first smoke exhaust pipe through an air inlet, the top of which is connected to the second smoke exhaust pipe through an air outlet, and a spray liquid is pre-placed in the spray chamber;

[0011] An air-distributing plate, which is fixedly embedded in the interior of the spray chamber, and a plurality of air-distributing holes are evenly distributed on the surface of the air-distributing plate;

[0012] A heat control gas plate group, which is fixedly embedded in the interior of the spray chamber, and the heat control gas plate group is arranged below the gas equalizing plate and above the air inlet, and is used to change the blocking condition of the gas equalizing hole according to the flue gas temperature;

[0013] A spray enclosure, which is embedded in the spray bin;

[0014] A spray pipe is embedded in the spray enclosure and is used to spray the spray liquid in the spray bin toward the air equalizing plate.

[0015] Furthermore, preferably, a partition plate is connected to the interior of the spray bin in a vertical limited sliding manner, the space below the partition plate is used to hold the spray liquid, and the upper surface of the partition plate is used to temporarily store waste liquid generated after spraying by the spray pipe.

[0016] Furthermore, preferably, the partition plate is made of a heat-conducting material.

[0017] Furthermore, preferably, the number of the spray pipes is 3-8, and the multiple spray pipes are distributed at intervals, and one side of the spray bin is also connected to a pump body for providing spray liquid to the spray pipes.

[0018] Further, preferably, the thermal control gas plate group comprises:

[0019] A driving ring, which is fixed below the gas equalizing plate, and the inner surface of the driving ring is provided with a plurality of through grooves;

[0020] A thermal expansion column fixed in the through groove;

[0021] A rotating plate is rotatably arranged in the driving ring, and a sliding block is fixed on the outer peripheral side of the rotating plate for slidingly arranging in the through groove and connecting with the thermal expansion column.

[0022] Further, as a preference, the bottom of the spray chamber is also connected to a transmission chamber, in which a lead screw is rotatably connected, and the lead screw extends upward into the spray chamber and is transmission-connected to the partition plate.

[0023] Furthermore, preferably, a motor is also provided in the transmission compartment, and the motor drives the lead screw to rotate via a bevel gear set.

[0024] Further, as a preference, a first gear is fixed to the outside of the screw, the first gear is located in the transmission compartment, and a plurality of second gears that are rotatably arranged in the transmission compartment and mesh with the first gear are rotatably arranged, a rotating shaft is fixed to the second gear, the rotating shaft extends upward into the spray compartment and is connected to a lever group.

[0025] Further, preferably, the lever group includes a plurality of arcuate rods distributed at circumferential intervals, the middle portion of the arcuate rods is a hollow structure, a sealing plate is fixed in the hollow structure, and a plurality of through holes connecting the hollow structure are distributed on the surface of the arcuate rods.

[0026] Further, preferably, when the partition plate moves downward, the rotation direction of the corresponding arc-shaped rod satisfies that the spray liquid can enter into the hollow structure and be discharged from the through hole.

[0027] Compared with the prior art, the present invention provides a system for utilizing waste heat from flue gas in a thermal power plant, which has the following beneficial effects:

[0028] In the present invention, when the flue gas passes through the first exhaust pipe, its heat will be absorbed by the liquid in the first heat exchange sleeve, achieving preliminary heat interception, and then the heated liquid flows into the second heat exchange sleeve through the first circulation pipe to exchange heat with the flue gas that is about to enter the chimney. In this way, the flue gas that originally entered the chimney with a low temperature will be heated, thereby increasing its temperature, facilitating subsequent water removal treatment, and achieving full utilization of waste heat.

[0029] In the present invention, the spray desulfurization component is in full contact with the flue gas through the spray liquid, and the thermal control gas plate group can automatically adjust the sealing of the uniform air holes according to the flue gas temperature, which helps to maintain the best desulfurization effect under different working conditions. Among them, when the flue gas temperature is too high, the openness of the uniform air holes is reduced. At this time, the flue gas will gather on the upper part of the partition plate. Since the partition plate is made of heat-conducting material, it can effectively conduct the heat in the flue gas to the spray liquid below, thereby improving its solubility and reaction activity, and further realizing the full utilization of the flue gas waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a structural schematic diagram of a flue gas waste heat utilization system in a thermal power plant.

[0031] Figure 2 The schematic diagram is a structural diagram of a spray desulfurization component in a flue gas waste heat utilization system of a thermal power plant.

[0032] Figure 3 The diagram is a structural diagram of a thermal control gas plate group in a flue gas waste heat utilization system of a thermal power plant.

[0033] Figure 4 for Figure 3 A is an enlarged structural diagram of FIG.

[0034] Figure 5 The present invention is a structural schematic diagram of a lever group in a flue gas waste heat utilization system of a thermal power plant.

[0035] In the figure: 1. boiler; 2. first smoke exhaust pipe; 3. spray desulfurization assembly; 4. second smoke exhaust pipe; 5. chimney; 6. first heat exchange sleeve; 7. second heat exchange sleeve; 8. first circulation pipe; 9. second circulation pipe; 31. spray chamber; 32. air inlet; 33. air equalization plate; 34. thermal control air plate group; 35. spray enclosure; 36. pre-separation plate; 37. pump body; 38. spray pipe; 39. partition plate; 310. lead screw; 311. first gear; 312. second gear; 313. rotating shaft; 314. lever group; 315. transmission chamber; 341. rotating plate; 342. driving ring; 343. through groove; 344. slider; 345. thermal expansion column; 3141. arc rod; 3142. through hole; 3143. blocking plate. DETAILED DESCRIPTION

[0036] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0037] Please refer to Figure 1-Figure 5 In an embodiment of the present invention, a system for utilizing waste heat from flue gas in a thermal power plant is provided, comprising a boiler 1, a first flue gas exhaust pipe 2, a spray desulfurization component 3, a second flue gas exhaust pipe 4, and a chimney 5 connected in series in sequence;

[0038] The first smoke exhaust pipe 2 is externally sheathed with a first heat exchange sleeve 6, the second smoke exhaust pipe 4 is externally sheathed with a second heat exchange sleeve 7, and a first circulation pipe 8 and a second circulation pipe 9 are connected between the first heat exchange sleeve 6 and the second heat exchange sleeve 7, so that the liquid in the first heat exchange sleeve 6, the second heat exchange sleeve 7, the first circulation pipe 8, and the second circulation pipe 9 circulates;

[0039] Of course, the first smoke exhaust pipe 2 is configured with a heat-conducting material only at the position corresponding to the first heat exchange sleeve 6, or the first smoke exhaust pipe 2 is made of a heat-conducting material as a whole, and the first smoke exhaust pipe 2 is provided with a heat-insulating sleeve in all areas except the position corresponding to the first heat exchange sleeve 6;

[0040] Similarly, the second smoke exhaust pipe 4 is configured with a heat-conducting material only at the position corresponding to the second heat exchange sleeve 7, or the second smoke exhaust pipe 4 is entirely made of a heat-conducting material, and the second smoke exhaust pipe 4 is provided with a heat-insulating sleeve except for the area corresponding to the second heat exchange sleeve 7;

[0041] When the smoke passes through the first smoke exhaust pipe 2, its heat will be absorbed by the liquid in the first heat exchange sleeve 6, thereby achieving preliminary interception of heat.

[0042] Subsequently, the heated liquid flows into the second heat exchange sleeve 7 through the first circulation pipe 8 (driven by a water pump) to exchange heat with the flue gas that is about to enter the chimney 5. In this way, the flue gas that originally enters the chimney 5 with a lower temperature will be heated, thereby increasing its temperature.

[0043] In order to ensure continuous heat transfer, by providing a second circulation pipe 9, the liquid can flow back into the first heat exchange sleeve 6. In this way, heat can be continuously transferred from high-temperature flue gas to low-temperature flue gas, thereby achieving full utilization of waste heat.

[0044] In addition, when the flue gas entering the chimney 5 with a relatively low temperature is heated, its temperature will rise, and the water vapor therein will become more active due to the increase in temperature, and it will be easier to condense into liquid water in the subsequent dehydration process.

[0045] Of course, a denitrification device may be provided between the boiler 1 and the chimney 5, which is beyond the scope of the present invention and will not be introduced further.

[0046] Wherein, the spray desulfurization component 3 comprises:

[0047] A spray chamber 31, whose side is connected to the first smoke exhaust pipe 2 through an air inlet 32, and whose top is connected to the second smoke exhaust pipe 4 through an air outlet, and a spray liquid is pre-placed in the spray chamber 31;

[0048] An air distribution plate 33, which is fixedly embedded in the spray chamber 31, and has a plurality of air distribution holes evenly distributed on its surface;

[0049] A heat control gas plate group 34 is fixedly embedded in the spray chamber 31, and the heat control gas plate group 34 is arranged below the gas equalizing plate 33 and above the air inlet 32, and is used to change the blocking condition of the gas equalizing holes according to the smoke temperature;

[0050] A spray enclosure 35, which is embedded in the spray chamber 31 and located above the air equalizing plate 33;

[0051] The spray pipe 38 is embedded in the spray enclosure 35 and is used to spray the spray liquid in the spray chamber 31 toward the gas equalizing plate 33 .

[0052] In addition, a pre-separation plate 36 may be disposed on the top of the spray chamber 31 to preliminarily separate water vapor from the flue gas.

[0053] In this embodiment, the spray desulfurization component 3 achieves efficient desulfurization effect through full contact between the spray liquid and the flue gas. The thermal control gas plate group 34 can automatically adjust the blocking of the uniform pores according to the flue gas temperature, which helps to maintain the best desulfurization effect under different working conditions. When the flue gas temperature is high, the openness of the uniform pores is temporarily reduced to ensure the utilization rate of the desulfurizer; when the temperature is moderate, keeping the uniform pores open is conducive to the rapid contact between the flue gas and the spray liquid, and achieving conventional desulfurization.

[0054] In this embodiment, the interior of the spray chamber 31 is vertically limited and slidably connected with a partition plate 39 , the space below the partition plate 39 is used to hold the spray liquid, and the upper surface of the partition plate 39 is used to temporarily store waste liquid generated after spraying by the spray pipe 38 .

[0055] Moreover, the partition plate 39 is made of heat conductive material.

[0056] In the prior art, waste liquid is often directly deposited in the spray liquid, which not only affects the purity and desulfurization efficiency of the spray liquid, but also may increase the difficulty and cost of subsequent waste liquid treatment. After the partition plate 39 is introduced, the waste liquid generated by the spray pipe 38 after spraying can be directly temporarily stored on the upper surface of the partition plate 39, avoiding direct contact with the spray liquid below. In this way, the waste liquid can be more conveniently collected and discharged through a special pipeline or device, without the need to be deposited in the spray liquid and slowly discharged.

[0057] In addition, the partition plate 39 is also provided to facilitate subsequent stirring of the spray liquid. Since the waste liquid is separated by the partition plate 39, the spray liquid can be kept relatively clean and uniform. When the spray liquid needs to be stirred to improve its uniformity and reaction efficiency, the stirring operation can be more easily implemented without being disturbed by the waste liquid.

[0058] Among them, when the flue gas temperature is high, the thermal control gas plate group 34 will increase the degree of blocking the uniform air holes. At this time, the flue gas may gather on the upper part of the partition plate 39 and transfer heat to the waste liquid. Since the partition plate 39 is a heat-conducting material, it can effectively transfer the heat in the waste liquid to the spray liquid below, thereby fully utilizing the waste heat of the flue gas.

[0059] In this case, the temperature of the spray liquid will also increase, and its solubility and reaction activity will increase, thereby improving the desulfurization efficiency.

[0060] In this embodiment, a transmission chamber 315 is further connected to the bottom of the spray chamber 31 , and a lead screw 310 is rotatably connected in the transmission chamber 315 . The lead screw 310 extends upward into the spray chamber 31 and is transmission-connected to the partition plate 39 .

[0061] When the spray pipe 38 continuously sprays the spray liquid into the spray bin 31, the spray liquid reacts with the sulfur oxides in the flue gas to form waste liquid. The waste liquid is deposited on the upper surface of the partition plate 39 and gradually increases as the spraying process continues. As the spraying process proceeds, the overall liquid level of the spray liquid in the spray bin 31 gradually decreases.

[0062] In order to maintain a reasonable distribution of the spray liquid and the waste liquid in the spray chamber 31, the partition plate 39 needs to be able to move up and down to adapt to changes in the liquid level. For example, when the waste liquid increases and the spray liquid decreases, the partition plate 39 will naturally move downward.

[0063] In order to realize automatic adjustment of the partition plate 39, a transmission chamber 315 is connected to the bottom of the spray chamber 31, and a lead screw 310 is rotatably connected in the transmission chamber 315. The lead screw 310 extends upward into the spray chamber 31 and is transmission-connected to the partition plate 39. This design allows the partition plate 39 to be driven up and down by rotating the lead screw 310.

[0064] The transmission compartment 315 is also provided with a motor (not shown in the figure), and the motor drives the lead screw 310 to rotate via a bevel gear set.

[0065] In addition, a first gear 311 is fixed to the outside of the lead screw 310, and the first gear 311 is located in the transmission chamber 315. A plurality of second gears 312 that mesh with the first gear 311 are rotatably arranged in the transmission chamber 315, and a rotating shaft 313 is fixed to the second gear 312. The rotating shaft 313 extends upward into the spray chamber 31 and is connected to a lever group 314.

[0066] The lead screw 310 rotates under the drive of the motor, and the first gear 311 outside the lead screw 310 meshes with the plurality of second gears 312 in the transmission compartment 315 to achieve power transmission. The rotation of the lead screw 310 can simultaneously drive the movement of multiple components, including the up and down movement of the partition plate 39. The movement of the partition plate 39 is adjusted according to the change of the spray liquid level to maintain a reasonable distribution.

[0067] In addition, a rotating shaft 313 is fixed to each second gear 312, and these rotating shafts 313 extend upward into the spray chamber 31 and are connected to a lever group 314. When the second gear 312 rotates with the rotation of the lead screw 310, the rotating shaft 313 and the lever group 314 also rotate accordingly. The lever group 314 stirs the spray liquid in the spray chamber 31 to ensure that the subsequent spray liquid fully contacts and reacts with the sulfur oxides in the flue gas.

[0068] The spray liquid is generally a limestone solution, and its desulfurization effect is closely related to the uniformity and reaction activity of the spray liquid. Through the stirring action of the lever group 314, the limestone particles in the spray liquid can be more evenly distributed in the spray chamber 31, thereby increasing the contact area with the flue gas and the reaction efficiency. At the same time, stirring also helps to prevent the formation of sediment in the spray liquid and maintain the activity of the spray liquid.

[0069] More specifically, the lever group 314 includes a plurality of arcuate rods 3141 distributed at circumferential intervals, the middle portion of the arcuate rods 3141 is a hollow structure, a blocking plate 3143 is fixed in the hollow structure, and a plurality of through holes 3142 connecting the hollow structure are distributed on the surface of the arcuate rods 3141.

[0070] When the partition plate 39 moves downward, the corresponding rotation direction of the arc rod 3141 satisfies that the spray liquid can enter into the hollow structure and be discharged from the through hole 3142 .

[0071] Then, when the partition plate 39 moves downward due to the drop in the level of the spray liquid, the transmission mechanism connected thereto (such as the lead screw 310, the first gear 311, the second gear 312, etc.) will drive the rotation shaft 313 and the lever group 314 to rotate. At this time, the rotation direction of the arc rod 3141 is designed so that the spray liquid can smoothly enter its hollow structure.

[0072] As the arc rod 3141 rotates, the spray liquid enters the hollow structure. Due to the circular motion of the arc rod and the sealing plate 3143 in the hollow structure, the spray liquid is squeezed in the hollow structure. Subsequently, the spray liquid is discharged through the through hole 3142, thereby stirring and distributing the spray liquid.

[0073] Furthermore, the simultaneous rotation of the plurality of arc-shaped rods 3141 allows the spray liquid in the spray chamber 31 to be stirred in all directions, which helps to evenly distribute the limestone particles and improve the contact area and reaction efficiency between the spray liquid and the sulfur oxides in the flue gas.

[0074] In this embodiment, the number of the spray pipes 38 is 3-8, and the multiple spray pipes 38 are distributed at intervals. A pump body 37 for providing spray liquid to the spray pipes 38 is also connected to one side of the spray chamber 31.

[0075] In this embodiment, the thermal control gas plate group 34 includes:

[0076] A driving ring 342, which is fixed below the gas equalizing plate 33, and a plurality of through grooves 343 are formed on the inner surface of the driving ring 342;

[0077] A thermal expansion column 345 fixed in the through groove 343;

[0078] The rotating plate 341 is rotatably disposed in the driving ring 342, and a slider 344 is fixed to the outer peripheral side of the rotating plate 341. The slider 344 is slidably disposed in the through groove 343, and the slider 344 is connected to the thermal expansion column 345. A plurality of ventilation holes corresponding to the air equalizing holes are opened on the surface of the rotating plate 341.

[0079] When the temperature is low, the rotating plate 341 is in the initial position, and the vent holes on the surface are aligned with the air equalization holes below. In this way, the air flow can smoothly pass through the air equalization holes and the vent holes to achieve normal gas flow and distribution.

[0080] When the ambient temperature rises, the thermal expansion column 345 will expand accordingly. Since the thermal expansion column is connected to the slider 344 on the rotating plate 341, the expansion of the thermal expansion column will push the slider and the rotating plate 341 to rotate inside the driving ring 342.

[0081] As the rotating plate 341 rotates, the relative positions of the vent holes on its surface and the air equalization holes below change from the original aligned state to the misaligned state. This misalignment causes some vent holes to no longer be directly connected to the air equalization holes, thereby limiting the airflow.

[0082] The degree of misalignment between the vent hole and the equalizing hole depends on the rotation angle of the rotating plate 341, and the rotation angle is determined by the expansion amount of the thermal expansion column 345. Therefore, as the temperature rises, the blocking effect will gradually increase.

[0083] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for utilizing waste heat from flue gas in a thermal power plant, characterized in that: It comprises a boiler (1), a first smoke exhaust pipe (2), a spray desulfurization component (3), a second smoke exhaust pipe (4), and a chimney (5) which are connected in series in sequence; The first smoke exhaust pipe (2) is externally sheathed with a first heat exchange sleeve (6), the second smoke exhaust pipe (4) is externally sheathed with a second heat exchange sleeve (7), and a first circulation pipe (8) and a second circulation pipe (9) are connected between the first heat exchange sleeve (6) and the second heat exchange sleeve (7), so that liquid in the first heat exchange sleeve (6), the second heat exchange sleeve (7), the first circulation pipe (8), and the second circulation pipe (9) can circulate; Wherein, the spray desulfurization component (3) comprises: A spray chamber (31), the side of which is connected to the first smoke exhaust pipe (2) through an air inlet (32), and the top of the spray chamber (31) is connected to the second smoke exhaust pipe (4) through an air outlet, and spray liquid is also pre-placed in the spray chamber (31); An air equalizing plate (33) is fixedly embedded in the interior of the spray chamber (31), and a plurality of air equalizing holes are evenly distributed on the surface of the air equalizing plate (33); a heat control gas plate group (34) fixedly embedded in the interior of the spray chamber (31), and the heat control gas plate group (34) is arranged below the gas equalizing plate (33) and above the air inlet (32), and is used to change the blocking condition of the gas equalizing holes according to the smoke temperature; A spray pipe (38), which is embedded in the spray chamber (31) and is used to spray the spray liquid in the spray chamber (31) toward the gas equalizing plate (33); A partition plate (39) is vertically limited and slidably connected inside the spray bin (31); the space below the partition plate (39) is used to hold the spray liquid; and the upper surface of the partition plate (39) is used to temporarily store waste liquid generated after spraying by the spray pipe (38); The bottom of the spray chamber (31) is also connected to a transmission chamber (315), and a lead screw (310) is rotatably connected in the transmission chamber (315). The lead screw (310) extends upward into the spray chamber (31) and is transmission-connected to the partition plate (39); A first gear (311) is also fixed to the outside of the lead screw (310), the first gear (311) is located in a transmission chamber (315), a plurality of second gears (312) are rotatably arranged in the transmission chamber (315) and mesh with the first gear (311), a rotating shaft (313) is fixed to the second gear (312), the rotating shaft (313) extends upward into the spray chamber (31) and is connected to a lever assembly (314); The lever assembly (314) comprises a plurality of arc-shaped rods (3141) spaced apart from each other in a circumferential manner, the middle of the arc-shaped rods (3141) being a hollow structure, a blocking plate (3143) being fixed in the hollow structure, and a plurality of through holes (3142) communicating with the hollow structure being distributed on the surface of the arc-shaped rods (3141); When the partition plate (39) moves downward, the corresponding arc-shaped rod (3141) rotates in a direction that satisfies the requirement that the spray liquid can enter the hollow structure and be discharged from the through hole (3142).

2. A system for utilizing waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The partition plate (39) is made of a heat-conducting material.

3. A system for utilizing waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The number of the spray pipes (38) is 3-8, and the plurality of spray pipes (38) are distributed at intervals. A pump body (37) for supplying spray liquid to the spray pipes (38) is also connected to one side of the spray chamber (31).

4. A system for utilizing waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The thermal control gas plate group (34) comprises: A driving ring (342) is fixed below the gas equalizing plate (33), and a plurality of through grooves (343) are formed on the inner surface of the driving ring (342); A thermal expansion column (345) fixed in the through groove (343); The rotating plate (341) is rotatably disposed in the driving ring (342), and a sliding block (344) is fixed to the outer peripheral side of the rotating plate (341) for slidingly disposing in the through groove (343) and connecting to the thermal expansion column (345).

5. The system for utilizing waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: A motor is also provided in the transmission chamber (315), and the motor drives the lead screw (310) to rotate via a bevel gear set.

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