Flue gas waste heat utilization system for power station boiler

Abstract

The invention relates to the technical field of flue gas waste heat utilization, and particularly provides a flue gas waste heat utilization system for a power station boiler. The flue gas waste heat utilization system for the power station boiler comprises a coal saving assembly, an air preheating assembly, a flow increasing assembly and a dust remover. The device can ensure that tail gas flows straightly and spaciously, so that the flow speed and flow state of the tail gas are optimized, the flow stability and uniformity of the tail gas are enhanced, the ash deposition phenomenon is reduced, and tail gas retention or backflow is avoided; ash substances in the tail gas are prevented from being accumulated on the outer walls of the coal-saving assembly and the air preheating assembly which are low in flow rate and need efficient heat exchange, the heat transfer effect is affected, meanwhile, accumulated ash can be cleaned in time on the portion, prone to ash accumulation, of an airflow dense area, blockage caused by accumulated ash accumulation is prevented, and it is ensured that a tail gas channel is unblocked; equipment faults caused by dust accumulation and blockage are avoided, and long-term stable operation of a power station boiler tail gas treatment system is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas waste heat utilization, and particularly provides a flue gas waste heat utilization system for a power station boiler. BACKGROUND

[0002] With the increasing demand for energy and the increasingly stringent requirements for environmental protection, the operation efficiency and tail gas emission control of power station boilers have become the focus of the power industry. The traditional tail gas treatment system of power station boilers generally has low waste heat recovery efficiency, serious ash accumulation and high maintenance difficulty, which seriously restricts the improvement of the thermal efficiency of the boiler and the environmental performance.

[0003] In the prior art, the tail gas waste heat recovery device usually adopts a simple heat exchange structure, which causes the high-temperature heat energy in the tail gas to be not fully utilized, resulting in energy waste, increased fuel consumption and operation cost. At the same time, the tail gas flow channel is not reasonably designed, and the flue gas of the power station boiler has high ash content and complex composition (such as containing alkali metals, calcium, etc.), which not only easily causes abrasion during heat exchange, but also promotes the accumulation of ash, especially in the air flow intensive area and the guiding device, the ash accumulation and blockage phenomenon frequently occur, which not only reduces the smoothness of the tail gas flow, affects the heat exchange and dust removal effect, but also increases the corrosion and abrasion risk of the equipment, shortens the service life of the equipment.

[0004] In addition, the maintenance mode of the existing dust removal system usually adopts a soot blower cleaning or even needs to be disassembled as a whole, lacks efficient and convenient modular design, and causes long maintenance period and long downtime, which affects the continuous and stable operation of the power station. SUMMARY

[0005] Therefore, it is necessary to provide a flue gas waste heat utilization system for a power station boiler to solve at least one technical problem in the background.

[0006] A flue gas waste heat utilization system for a power station boiler, comprising a coal saving assembly, an air preheating assembly, a flow increasing assembly and a dust remover, the coal saving assembly, the flow increasing assembly and the dust remover are installed in the installation ground along the length direction at intervals, the top of the coal saving assembly is provided with a coal saving gas inlet hopper, four disassembly sliding grooves are concavely arranged in the middle of the inner side of the coal saving gas inlet hopper along the length direction, the bottom of the air preheating assembly is installed in the coal saving gas inlet hopper, the bottom of the coal saving assembly is provided with an outlet gas elbow, the flow increasing assembly comprises a flow increasing base, a flow increasing gas channel, a gas guide elbow, a booster motor and booster blades, the bottom of the flow increasing base is installed in the middle of the installation ground, the bottom surface of the flow increasing gas channel is installed on the top of the flow increasing base, the top of the outlet gas elbow is connected with one end of the flow increasing gas channel, one end of the gas guide elbow is connected with the other end of the flow increasing gas channel, the other end of the gas guide elbow is connected with the dust remover, the booster motor is installed on the flow increasing gas channel adjacent to one end of the outlet gas elbow, and the booster blades are rotatably installed in the flow increasing gas channel adjacent to one end of the outlet gas elbow.

[0007] As a further improvement of the present application, the coal-saving assembly comprises a coal-saving mounting frame, a coal-saving outer frame, a coal-saving gas outlet hopper and a water pipe element. The coal-saving mounting frame is installed at one end of the installation ground. The coal-saving outer frame is installed at the top of the coal-saving mounting frame. The coal-saving gas outlet hopper is installed at the bottom of the coal-saving outer frame. The gas outlet bend is arranged at the bottom of the coal-saving gas outlet hopper. The coal-saving outer frame is hollow inside to form a hollow cavity. A plurality of liquid inlet mounting holes and a plurality of liquid outlet mounting holes are arranged at the top of one side and the bottom of the other side of the hollow cavity along the length direction. The water pipe element is installed in the coal-saving outer frame.

[0008] As a further improvement of the present application, the water pipe element comprises a plurality of serpentine bent pipes, a liquid inlet main pipe and a liquid outlet main pipe. The top of each serpentine bent pipe is installed in a liquid inlet mounting hole. The bottom of each serpentine bent pipe is installed in a liquid outlet mounting hole. A plurality of heat exchange liquid inlet pipes are arranged on the inner side of the liquid inlet main pipe along the length direction. Each heat exchange liquid inlet pipe is connected to the top of a serpentine bent pipe. A plurality of heat exchange liquid outlet pipes are arranged on the inner side of the liquid outlet main pipe along the length direction. Each heat exchange liquid outlet pipe is connected to the bottom of a serpentine bent pipe. A plurality of heat exchange fins are arranged on the outer wall of each serpentine bent pipe.

[0009] As a further improvement of the present application, the air preheating assembly comprises a coarse dust removal mounting frame, a guide element, a coarse dust removal element, an air preheating frame and an air preheating element. The coarse dust removal mounting frame is installed at the middle and top of the coal-saving gas inlet hopper. Two installation crossbars are arranged on the bottom of the coarse dust removal mounting frame. Each installation crossbar is recessed with four installation turntables along the length direction. The guide element is installed at the top of the coarse dust removal mounting frame. The coarse dust removal element is installed at the bottom of the coarse dust removal mounting frame. The air preheating frame is installed on the top surface of the coarse dust removal mounting frame. The air preheating element is installed in the air preheating frame.

[0010] As a further improvement of the present application, the air preheating frame is recessed with a heating gas inlet groove and a heating gas outlet groove at both ends. A heating gas inlet hopper is arranged on the heating gas inlet groove. A heating gas outlet hopper is arranged on the heating gas outlet groove. A flue gas inlet hopper is arranged at the top of the air preheating frame.

[0011] As a further improvement of the present application, the air preheating element comprises two preheating mounting plates and a plurality of triangular ventilation pipes. The two preheating mounting plates are installed in the heating gas inlet groove and the heating gas outlet groove, respectively. A plurality of triangular communication grooves are arranged on each preheating mounting plate. The two ends of the plurality of triangular ventilation pipes are installed in the plurality of triangular communication grooves of the two preheating mounting plates.

[0012] As a further improvement of the application, the guide element comprises four first guide cones, two wind converging slabs, three second guide cones and three elastic lamella cones, the four first guide cones are respectively installed at the top of the coarse dust removal mounting frame along the length direction, the two wind converging slabs are respectively installed at the two ends of the coarse dust removal mounting frame, the three second guide cones are respectively installed at the top of the coarse dust removal mounting frame, and the four first guide cones are alternately arranged with the three second guide cones, the two ends of the three elastic lamella cones are respectively installed at the middle of the two ends of the coarse dust removal mounting frame, and the three second guide cones are respectively arranged inside the three elastic lamella cones, and the two ends of the elastic lamella cones at the two ends of the coarse dust removal mounting frame are respectively downwardly inclined and protrude with inclined air guide fins.

[0013] As a further improvement of the application, the coarse dust removal element comprises four dust removal rotating shafts and four detachable dust removal discs, the two ends of the four dust removal rotating shafts are respectively installed in the eight installation rotating tables, a plurality of air guide vanes are protruded on the outer wall of the dust removal rotating shaft along the circumferential direction, and a dust removal scraping blade is arranged on each air guide vane, the two ends of the four detachable dust removal discs are respectively clamped and installed on the two installation horizontal strips, and one end of the four detachable dust removal discs is respectively clamped and installed in the four disassembly sliding grooves.

[0014] As a further improvement of the application, each detachable dust removal disc comprises two sealing side plates, an arc-shaped guide horizontal plate, a collection box and a gas leakage inclined plate, the bottoms of the two sealing side plates are respectively clamped and installed on the two installation horizontal strips, and one of the two sealing side plates is clamped and installed in the disassembly sliding groove, the two ends of the arc-shaped guide horizontal plate are respectively installed in the two sealing side plates, and a plurality of collection holes are arrayed and recessed on the bottom of the arc-shaped guide horizontal plate, the collection box is installed in the middle of the arc-shaped guide horizontal plate, and the plurality of collection holes are in communication with the inner cavity of the collection box, and the top of the gas leakage inclined plate is obliquely installed on the inner bottom of the arc-shaped guide horizontal plate.

[0015] As a further improvement of the application, the inner top of each wind converging slab is protruded with an elastic inclined plate, the bottom of the elastic inclined plate is protruded with a sliding horizontal plate, and the inner side of the sliding horizontal plate is slidably attached to the outer wall of the arc-shaped guide horizontal plate; the outer wall of the dust removal scraping blade is rotatably attached to the outer wall of the arc-shaped guide horizontal plate.

[0016] The beneficial effects of the application are as follows: 1. The application can effectively recover the residual heat in the tail gas, preheat the air and feed water entering the boiler, ensure the straight and spacious flow of the tail gas, optimize the flow rate and flow state of the tail gas, enhance the flow stability and uniformity of the tail gas, reduce the ash deposition phenomenon, avoid the tail gas retention or backflow, prevent the ash substances in the tail gas from accumulating on the outer wall of the coal saving assembly and air preheating assembly with low flow rate and requiring efficient heat exchange, affect the heat transfer effect, and facilitate efficient dust removal by the subsequent dust collector, reduce dust emission, and improve the boiler thermal efficiency and tail gas treatment efficiency.

[0017] 2.The case can reasonably guide the flow of tail gas, and clean the dust accumulation of the dust accumulation prone area of the gas flow dense area in time, prevent the dust accumulation from causing blockage, ensure the smoothness of the tail gas passage, form a self-cleaning mechanism, reduce the corrosion and wear of the equipment surface caused by dust accumulation, avoid the equipment failure caused by dust accumulation blockage, prolong the service life of the dust removal device and related parts, ensure the long-term stable operation of the power plant boiler tail gas treatment system, in addition, the modularized and integrally extracted structure design is convenient for quick disassembly and offline cleaning when serious blockage occurs or maintenance is needed, greatly shortens the downtime, improves the equipment maintenance efficiency, and reduces the operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a three-dimensional schematic view of an embodiment of the present application.

[0019] Figure 2 is an internal schematic view of the flow increasing assembly in an embodiment of the present application.

[0020] Figure 3 is a three-dimensional schematic view of a coal saving assembly and an air preheating assembly in an embodiment of the present application.

[0021] Figure 4 is an internal schematic view of the coal saving assembly and the air preheating assembly in an embodiment of the present application.

[0022] Figure 5 is an internal schematic view of the coal saving assembly in an embodiment of the present application.

[0023] Figure 6 is an internal schematic view of the air preheating assembly in an embodiment of the present application.

[0024] Figure 7 is an internal schematic view of the air preheating assembly in another embodiment of the present application.

[0025] Figure 8 is Figure 7 is an enlarged view of A in FIG.

[0026] in the figure: 10, coal saving assembly; 11, coal saving gas inlet hopper; 12, gas outlet elbow; 13, coal saving outer frame; 131, hollow cavity; 132, liquid inlet mounting hole; 133, liquid outlet mounting hole; 14, coal saving gas outlet hopper; 15, water pipe element; 151, serpentine elbow pipe; 152, liquid inlet main pipe; 153, liquid outlet main pipe; 154, heat exchange liquid inlet pipe; 155, heat exchange liquid outlet pipe; 156, heat exchange fin; 20, air preheating assembly; 21, coarse dust removal mounting rack; 211, mounting cross strip; 212, mounting turntable; 22, guide element; 221, first guide cone; 222, wind gathering inclined plate; 223, second guide cone; 224, elastic sheet cone; 220, inclined air guide sheet; 225, elastic inclined sheet; 226, sliding cross plate; 23, coarse dust removal element; 231, dust removal rotation shaft; 232, detachable dust removal disc; 233, air guide blade; 234, dust removal scraping sheet; 235, sealing side plate; 236, arc-shaped guide cross plate; 237, collection box; 238, deflation inclined sheet; 239, collection hole; 24, air preheating frame; 241, heating gas inlet groove; 242, heating gas outlet groove; 243, heating gas inlet hopper; 244, heating gas outlet hopper; 245, flue gas inlet hopper; 25, air preheating element; 251, preheating mounting plate; 252, triangular vent pipe; 253, triangular communication groove; 30, flow increasing assembly; 31, flow increasing base frame; 32, flow increasing gas channel; 33, gas guide elbow pipe; 34, pressure increasing motor; 35, pressure increasing blade; 40, dust remover. DETAILED DESCRIPTION

[0027] For the purpose of promoting the understanding and facilitating appreciation of the application, the application will be described in conjunction with the related drawings in which preferred embodiments of the application are shown. This application may, however, be carried out in many different forms and should not be construed as limited to the embodiments set forth in this disclosure. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0028] In the description of the present application, it should be noted that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0030] Referring to Figures 1 to 8 A flue gas waste heat utilization system for a power plant boiler, comprising a coal saving assembly 10, an air preheating assembly 20, a flow increasing assembly 30 and a dust collector 40, the coal saving assembly 10, the flow increasing assembly 30 and the dust collector 40 are installed in the installation ground along the length direction at intervals, the coal saving assembly 10 is provided with a coal saving gas inlet hopper 11 at the top, four disassembly sliding grooves are concavely arranged in the middle of the inner side of the coal saving gas inlet hopper 11 along the length direction, the air preheating assembly 20 is installed in the coal saving gas inlet hopper 11, the coal saving assembly 10 is provided with a gas outlet elbow 12 at the bottom, the flow increasing assembly 30 comprises a flow increasing base frame 31, a flow increasing gas channel 32, a gas guide elbow 33, a supercharging motor 34 and a supercharging blade 35, the flow increasing base frame 31 is installed in the middle of the installation ground at the bottom, the flow increasing gas channel 32 is installed at the top of the flow increasing base frame 31 at the bottom surface, the gas outlet elbow 12 is connected with one end of the flow increasing gas channel 32 at the top, one end of the gas guide elbow 33 is connected with the other end of the flow increasing gas channel 32, the other end of the gas guide elbow 33 is connected with the dust collector 40, the supercharging motor 34 is installed in the flow increasing gas channel 32 adjacent to one end of the gas outlet elbow 12, and the supercharging blade 35 is rotatably installed in the flow increasing gas channel 32 adjacent to one end of the gas outlet elbow 12.

[0031] The coal saving assembly 10 comprises a coal saving installation frame, a coal saving outer frame 13, a coal saving gas outlet hopper 14 and a water pipe element 15, the coal saving installation frame is installed at one end of the installation ground, the coal saving outer frame 13 is installed at the top of the coal saving installation frame at the middle, the coal saving gas outlet hopper 14 is installed at the bottom of the coal saving outer frame 13 at the top, the gas outlet elbow 12 is arranged at the bottom of the coal saving gas outlet hopper 14, the coal saving outer frame 13 is hollow at the inside to form a hollow cavity 131, a plurality of liquid inlet installation holes 132 and a plurality of liquid outlet installation holes 133 are concavely arranged at the top of one side and at the bottom of the other side of the hollow cavity 131 along the length direction, and the water pipe element 15 is installed in the coal saving outer frame 13.

[0032] The water pipe element 15 comprises a plurality of serpentine bends 151, a liquid inlet main pipe 152 and a liquid outlet main pipe 153. The top portions of the plurality of serpentine bends 151 are respectively installed in the plurality of liquid inlet mounting holes 132, and the bottom portions of the plurality of serpentine bends 151 are respectively installed in the plurality of liquid outlet mounting holes 133. The inner side of the liquid inlet main pipe 152 is protrudingly provided with a plurality of heat exchange liquid inlet pipes 154 along the length direction, and the plurality of heat exchange liquid inlet pipes 154 are respectively connected with the top portions of the plurality of serpentine bends 151. The inner side of the liquid outlet main pipe 153 is protrudingly provided with a plurality of heat exchange liquid outlet pipes 155 along the length direction, and the plurality of heat exchange liquid outlet pipes 155 are respectively connected with the bottom portions of the plurality of serpentine bends 151. A plurality of heat exchange fins 156 are arrayed on the outer wall of each serpentine bend 151.

[0033] The air preheating assembly 20 comprises a coarse dust removal mounting frame 21, a guide element 22, a coarse dust removal element 23, an air preheating frame 24 and an air preheating element 25. The coarse dust removal mounting frame 21 is installed in the middle and top portions of the coal saving gas inlet hopper 11. The bottom portion of the coarse dust removal mounting frame 21 is protrudingly provided with mounting horizontal bars 211 on both sides. Each mounting horizontal bar 211 is recessingly provided with four mounting turntables 212 along the length direction. The guide element 22 is installed on the top portion of the coarse dust removal mounting frame 21. The coarse dust removal element 23 is installed on the bottom portion of the coarse dust removal mounting frame 21. The air preheating frame 24 is installed on the top surface of the coarse dust removal mounting frame 21. The air preheating element 25 is installed in the air preheating frame 24.

[0034] The air preheating frame 24 is recessingly provided with a heating gas inlet groove 241 and a heating gas outlet groove 242 at both ends. The heating gas inlet groove 241 is provided with a heating gas inlet hopper 243. The heating gas outlet groove 242 is provided with a heating gas outlet hopper 244. The top portion of the air preheating frame 24 is provided with a flue gas inlet hopper 245.

[0035] The air preheating element 25 comprises two preheating mounting plates 251 and a plurality of triangular ventilation pipes 252. The two preheating mounting plates 251 are respectively installed in the heating gas inlet groove 241 and the heating gas outlet groove 242. A plurality of triangular communication grooves 253 are arrayed and recessed on each preheating mounting plate 251. The two ends of the plurality of triangular ventilation pipes 252 are respectively installed in the plurality of triangular communication grooves 253 of the two preheating mounting plates 251.

[0036] The guide element 22 comprises four first guide cones 221, two wind gathering inclined plates 222, three second guide cones 223 and three elastic lamella cones 224. The four first guide cones 221 are respectively installed at the top of the rough dust removal mounting frame 21 along the length direction. The two wind gathering inclined plates 222 are respectively installed at the two ends of the rough dust removal mounting frame 21. The three second guide cones 223 are respectively installed at the top of the rough dust removal mounting frame 21. The four first guide cones 221 are alternately arranged with the three second guide cones 223. The three elastic lamella cones 224 are respectively installed at the middle of the two ends of the rough dust removal mounting frame 21. The three second guide cones 223 are respectively arranged inside the three elastic lamella cones 224. The bottom of the two ends of the elastic lamella cone 224 at the two ends of the rough dust removal mounting frame 21 is respectively downwardly inclined and protrudes with an inclined air guide fin 220.

[0037] The rough dust removal element 23 comprises four dust removal rotating shafts 231 and four detachable dust removal discs 232. The two ends of the four dust removal rotating shafts 231 are respectively installed in the eight installation rotating tables 212. The outer wall of the dust removal rotating shaft 231 is outwardly and circumferentially provided with a plurality of air guide blades 233. The dust removal scraping blade 234 is arranged on each air guide blade 233. The two ends of the four detachable dust removal discs 232 are respectively clamped and installed on the two installation horizontal strips 211. One end of the four detachable dust removal discs 232 is respectively clamped and installed in the four disassembly sliding grooves.

[0038] Each detachable dust removal disc 232 comprises two sealing side plates 235, an arc-shaped guide horizontal plate 236, a collection box 237 and a gas leakage inclined plate 238. The bottom of the two sealing side plates 235 is respectively clamped and installed on the two installation horizontal strips 211. One of the two sealing side plates 235 is clamped and installed in the disassembly sliding groove. The two ends of the arc-shaped guide horizontal plate 236 are respectively installed in the two sealing side plates 235. The bottom of the arc-shaped guide horizontal plate 236 is arrayed and recessed with a plurality of collection holes 239. The collection box 237 is installed in the middle of the arc-shaped guide horizontal plate 236. The plurality of collection holes 239 are in communication with the inner cavity of the collection box 237. The gas leakage inclined plate 238 is obliquely installed at the top of the inner side of the arc-shaped guide horizontal plate 236.

[0039] The inner top of each wind gathering inclined plate 222 is outwardly provided with an elastic inclined plate 225. The bottom of the elastic inclined plate 225 is outwardly provided with a sliding horizontal plate 226. The inner side of the sliding horizontal plate 226 is slidingly attached to the outer wall of the arc-shaped guide horizontal plate 236. The outer wall of the dust removal scraping blade 234 is rotationally attached to the outer wall of the arc-shaped guide horizontal plate 236.

[0040] For example, in an embodiment: four detachable dust removal plates 232 are arranged symmetrically in pairs. The flue gas inlet hopper 245 is connected to the exhaust pipe of the power plant boiler through a pipe. The heating inlet hopper 243 is connected to the external cold air inlet through a pipe, and the heating outlet hopper 244 is connected to the combustion-supporting outlet pipe of the furnace of the power plant boiler. The triangular ventilation pipes 252 are made of enamel-coated steel plates to improve their surface smoothness, prevent dust accumulation, and have corrosion resistance.

[0041] For example, in an embodiment: when the exhaust gas of the power plant boiler flows into the air preheating frame 24 from the flue gas inlet hopper 245, the external cold air will be evenly divided into the multiple triangular ventilation pipes 252 from the heating inlet hopper 243 through the multiple triangular communication grooves 253, thereby rapidly warming the cold air in the multiple triangular ventilation pipes 252 and sending it into the heating outlet hopper 244. At this time, due to the fact that the multiple triangular ventilation pipes 252 are arranged in a row and the cross-sectional area of the triangular ventilation pipes 252 is triangular, the exhaust gas of the power plant boiler flows straight and widely, making it easy for ash to be carried away with the flue gas, thereby reducing the possibility of dust accumulation. Subsequently, the exhaust gas will flow to the coarse dust removal mounting frame 21 and, under the guidance of the four first guide cones 221, the two wind converging inclined plates 222, and the three elastic lamella cones 224, it will be sent to the bottom of the coal-saving inlet hopper 11 and the coal-saving outer frame 13. At this time, the heat exchange liquid will be evenly divided into the multiple serpentine bends 151 through the liquid inlet main pipe 152, thereby rapidly and massively exchanging heat between the multiple heat exchange fins 156 on the serpentine bends 151 and the high-temperature exhaust gas. Subsequently, after being converged by the liquid outlet main pipe 153, the heat exchange liquid will be sent to the feedwater end of the power plant boiler, achieving the purpose of improving the thermal efficiency of the power plant and saving fuel.

[0042] Subsequently, the heat-exchanged exhaust gas will enter the flow-increasing air duct 32 along the outlet bend 12, and then the booster motor 34 will be started to drive the booster blades 35 to rotate, thereby further increasing the flow of the exhaust gas, which will then be sent to the dust collector 40 for rapid dust removal.

[0043] For example, in an embodiment: when the exhaust gas of the power plant boiler flows into the top and middle of the coal-saving inlet hopper 11, i.e., flows into the coarse dust removal mounting frame 21, it will be guided and converged by the four first guide cones 221, the two wind converging inclined plates 222, the three elastic lamella cones 224, the four inclined wind guide plates 220, and the four arc-shaped guide horizontal plates 236, and then will be sent to the four dust removal shafts 231, thereby blowing the multiple wind guide vanes 233 and the multiple dust removal wipers 234 to rotate, thereby scraping and cleaning the dust accumulated in the areas prone to dust accumulation in the converging flow and airflow dense areas, and entering the collection box 237 to prevent dust accumulation and blockage. The detachable dust removal plates 232 are modular and can be completely extracted as a whole. When serious blockage occurs or maintenance is needed, the entire module can be extracted like a drawer for offline thorough cleaning, greatly shortening the downtime.

[0044] At the same time, when the dust accumulation occurs to the three elastic sheet cones 224, since the elastic sheet cones 224 are only mounted on the coarse dust removal mounting frame 21 through the two end bottoms, and the second guide cone 223 is arranged inside the elastic sheet cone 224, and then when the dust adheres to one end of the outer wall of the elastic sheet cone 224, the force of the exhaust gas flowing through the two ends of the outer wall of the elastic sheet cone 224 will change, and then the elastic sheet cone 224 will be blown to one end, and then the inner wall of the elastic sheet cone 224 will “knock” the elastic sheet cone 224, and then the elastic sheet cone 224 will vibrate, and then the dust adhered to the elastic sheet cone 224 will quickly fall off.

[0045] The installation process is as follows: the coal-saving assembly 10, the flow-increasing assembly 30 and the bottom of the dust collector 40 are installed in the installation ground along the length direction at intervals, the bottom of the flow-increasing base frame 31 is installed in the middle of the installation ground, the bottom surface of the flow-increasing air duct 32 is installed on the top of the flow-increasing base frame 31, the top of the air outlet elbow 12 is connected with one end of the flow-increasing air duct 32, one end of the air guide elbow 33 is connected with the other end of the flow-increasing air duct 32, the other end of the air guide elbow 33 is connected with the dust collector 40, the booster motor 34 is installed on the flow-increasing air duct 32 adjacent to one end of the air outlet elbow 12, the booster blade 35 is rotatably installed in the flow-increasing air duct 32 adjacent to one end of the air outlet elbow 12, the coal-saving installation frame is installed on one end of the installation ground, the middle of the coal-saving outer frame 13 is installed on the top of the coal-saving installation frame, the top of the coal-saving air outlet 14 is installed on the bottom of the coal-saving outer frame 13, the top of the plurality of serpentine elbows 151 is respectively installed in the plurality of liquid inlet installation holes 132, the bottom of the plurality of serpentine elbows 151 is respectively installed in the plurality of liquid outlet installation holes 133, the plurality of heat exchange liquid inlet pipes 154 are respectively connected with the top of the plurality of serpentine elbows 151, the plurality of heat exchange liquid outlet pipes 155 are respectively connected with the bottom of the plurality of serpentine elbows 151, the coarse dust removal installation frame 21 is installed in the middle and top of the coal-saving air inlet 11, the two preheating installation plates 251 are respectively installed in the heating air inlet groove 241 and the heating air outlet groove 242, the plurality of triangular air pipes 252 are respectively installed in the plurality of triangular communication grooves 253 of the two preheating installation plates 251, the four first guide cones 221 are respectively installed on the top of the coarse dust removal installation frame 21 along the length direction at intervals, the two wind gathering inclined plates 222 are respectively installed on the two ends of the coarse dust removal installation frame 21, the three second guide cones 223 are respectively installed on the top of the coarse dust removal installation frame 21, and the four first guide cones 221 are respectively arranged alternately with the three second guide cones 223, the two ends and the bottom of the three elastic sheet cones 224 are respectively installed in the middle of the two ends of the coarse dust removal installation frame 21, and the three second guide cones 223 are respectively arranged in the three elastic sheet cones 224, the two ends of the four dust removal rotating shafts 231 are respectively installed in the eight installation rotating tables 212, the two ends of the four detachable dust removal plates 232 are respectively clamped and installed on the two installation horizontal strips 211, and one end of the four detachable dust removal plates 232 is respectively clamped and installed in the four disassembly sliding grooves, the bottom of the two sealing side plates 235 is respectively clamped and installed on the two installation horizontal strips 211, and one of the two sealing side plates 235 is clamped and installed in the disassembly sliding groove, the two ends of the arc-shaped guide horizontal plate 236 are respectively installed in the two sealing side plates 235, the collection box 237 is installed in the middle of the arc-shaped guide horizontal plate 236, and the plurality of collection holes 239 are respectively communicated with the inner cavity of the collection box 237, and the air leakage inclined plate 238 is obliquely installed on the inner bottom of the arc-shaped guide horizontal plate 236.

[0046] The present application can realize: 1. The present application can effectively recover the waste heat in the tail gas, preheat the air and feed water entering the boiler, and ensure the tail gas flows straight and wide, so that the flow rate and flow state of the tail gas are optimized, the flow stability and uniformity of the tail gas are enhanced, the ash deposition phenomenon is reduced, and the tail gas stagnation or backflow is avoided, preventing the ash in the tail gas from accumulating on the outer wall of the coal economizer 10 and the air preheating assembly 20 which require efficient heat exchange due to low flow rate, affecting the heat transfer effect, and facilitating efficient dust removal by the subsequent dust collector 40, reducing dust emission, improving the boiler thermal efficiency and tail gas treatment efficiency.

[0047] 2. The present application can reasonably guide the flow of tail gas, and clean the ash deposition site in the gas flow dense area in time to prevent ash deposition from causing blockage and ensure the smooth passage of the tail gas channel, while forming a self-cleaning mechanism, reducing the corrosion and wear of the equipment surface caused by ash deposition, avoiding equipment failure caused by ash deposition blockage, prolonging the service life of the dust removal device and related parts, ensuring the long-term stable operation of the power plant boiler tail gas treatment system, in addition, the modular and overall extraction structure design facilitates quick disassembly and offline cleaning when serious blockage occurs or maintenance is required, greatly shortens the downtime, improves equipment maintenance efficiency, and reduces operating costs.

[0048] The above-mentioned embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A flue gas waste heat utilization system for a power plant boiler, characterized by: The utility model provides a kind of coal-saving assembly (10), air preheating assembly (20), flow increasing assembly (30) and dust catcher (40) including, coal-saving assembly (10), flow increasing assembly (30) and dust catcher (40) bottom are installed in installation ground along length direction interval, coal-saving assembly (10) top is provided with coal-saving gas inlet hopper (11), four disassembly sliding grooves are recessed in the middle of inside of coal-saving gas inlet hopper (11) along length direction interval, air preheating assembly (20) bottom is installed in coal-saving gas inlet hopper (11), coal-saving assembly (10) bottom is provided with gas outlet elbow (12), flow increasing assembly (30) includes flow increasing chassis (31), flow increasing airway (32), gas guide elbow (33), booster motor (34) and booster blade (35), flow increasing chassis (31) bottom is installed in installation ground middle part, flow increasing airway (32) bottom surface middle part is installed in flow increasing chassis (31) top, gas outlet elbow (12) top and flow increasing airway (32) one end are connected, gas guide elbow (33) one end and flow increasing airway (32) other end are connected, gas guide elbow (33) other end and dust catcher (40) are connected, booster motor (34) is installed in flow increasing airway (32) adjacent to gas outlet elbow (12) one end, booster blade (35) rotation is installed in flow increasing airway (32) inside adjacent to gas outlet elbow (12) one end.

2. The flue gas waste heat utilization system for a power plant boiler according to claim 1, characterized by: Coal-saving assembly (10) includes coal-saving mounting frame, coal-saving outer frame (13), coal-saving gas outlet hopper (14) and water pipe element (15), coal-saving mounting frame is installed in installation ground one end, coal-saving outer frame (13) middle part is installed in coal-saving mounting frame top, coal-saving gas outlet hopper (14) top is installed in coal-saving outer frame (13) bottom, gas outlet elbow (12) is arranged in the bottom of coal-saving gas outlet hopper (14), the hollow cavity (131) is formed in the hollow cavity (131) inside, multiple liquid inlet mounting holes (132) and multiple liquid outlet mounting holes (133) are recessed in the middle of one side top and other side bottom of hollow cavity (131) along length direction interval, water pipe element (15) is installed in coal-saving outer frame (13).

3. The flue gas waste heat utilization system for a power plant boiler according to claim 2, characterized by: Water pipe element (15) includes multiple serpentine elbows (151), liquid inlet main pipe (152) and liquid outlet main pipe (153), multiple serpentine elbows (151) top is installed in multiple liquid inlet mounting holes (132) respectively, multiple serpentine elbows (151) bottom is installed in multiple liquid outlet mounting holes (133) respectively, multiple heat exchange liquid inlet pipes (154) are protruded in the inside of liquid inlet main pipe (152) along length direction interval, multiple heat exchange liquid inlet pipes (154) are connected with multiple serpentine elbows (151) top respectively, multiple heat exchange liquid outlet pipes (155) are protruded in the inside of liquid outlet main pipe (153) along length direction interval, multiple heat exchange liquid outlet pipes (155) are connected with multiple serpentine elbows (151) bottom respectively, multiple heat exchange fins (156) are arranged on the outer wall of each serpentine elbow (151).

4. The flue gas waste heat utilization system for a power plant boiler according to claim 3, characterized by: The air preheating assembly (20) comprises a coarse dust removal mounting frame (21), a guide element (22), a coarse dust removal element (23), an air preheating frame (24) and an air preheating element (25). The coarse dust removal mounting frame (21) is mounted at the middle and top of the coal-saving gas inlet hopper (11). The bottom of the coarse dust removal mounting frame (21) is provided with mounting horizontal bars (211) on both sides. Each mounting horizontal bar (211) is provided with four mounting turntables (212) along the length direction. The guide element (22) is mounted at the top of the coarse dust removal mounting frame (21). The coarse dust removal element (23) is mounted at the bottom of the coarse dust removal mounting frame (21). The bottom surface of the air preheating frame (24) is mounted on the top surface of the coarse dust removal mounting frame (21). The air preheating element (25) is mounted in the air preheating frame (24).

5. The flue gas waste heat utilization system for a power plant boiler according to claim 4, characterized in that: The air preheating frame (24) is provided with a heating gas inlet groove (241) and a heating gas outlet groove (242) at both ends. The heating gas inlet groove (241) is provided with a heating gas inlet hopper (243). The heating gas outlet groove (242) is provided with a heating gas outlet hopper (244). The top of the air preheating frame (24) is provided with a flue gas inlet hopper (245).

6. The flue gas waste heat utilization system for a power plant boiler according to claim 5, characterized in that: The air preheating element (25) comprises two preheating mounting plates (251) and a plurality of triangular ventilation pipes (252). The two preheating mounting plates (251) are mounted in the heating gas inlet groove (241) and the heating gas outlet groove (242), respectively. Each preheating mounting plate (251) is provided with a plurality of triangular communication grooves (253) in an array. The plurality of triangular ventilation pipes (252) are mounted in the plurality of triangular communication grooves (253) of the two preheating mounting plates (251) at both ends.

7. The flue gas waste heat utilization system for a power plant boiler according to claim 6, characterized in that: The guide element (22) comprises four first guide cones (221), two wind converging inclined plates (222), three second guide cones (223) and three elastic sheet cones (224). The four first guide cones (221) are mounted at the top of the coarse dust removal mounting frame (21) in a length direction. The two wind converging inclined plates (222) are mounted at both ends of the coarse dust removal mounting frame (21). The three second guide cones (223) are mounted at the top of the coarse dust removal mounting frame (21). The four first guide cones (221) and the three second guide cones (223) are arranged alternately. The three elastic sheet cones (224) are mounted at the middle of both ends of the coarse dust removal mounting frame (21) at both ends. The three second guide cones (223) are arranged inside the three elastic sheet cones (224). The elastic sheet cones (224) at both ends of the coarse dust removal mounting frame (21) are provided with inclined air guide sheets (220) at both ends and bottom.

8. The flue gas waste heat utilization system for a power plant boiler according to claim 7, characterized in that: The rough dust removal element (23) comprises four dust removal shafts (231) and four detachable dust removal plates (232), the two ends of the dust removal shafts (231) are respectively installed in eight installation turntables (212), the outer wall of the dust removal shaft (231) is provided with a plurality of wind guide blades (233) in the circumferential direction, the dust removal scraper (234) is arranged on each wind guide blade (233), the two ends of the four detachable dust removal plates (232) are respectively clamped and installed on two installation horizontal strips (211), and one end of the four detachable dust removal plates (232) is respectively clamped and installed in four disassembly sliding grooves.

9. The flue gas waste heat utilization system for a power plant boiler according to claim 8, characterized in that: Each detachable dust removal plate (232) comprises two sealing side plates (235), an arc-shaped guide horizontal plate (236), a collection box (237) and a gas leakage inclined plate (238), the bottoms of the two sealing side plates (235) are respectively clamped and installed on the two installation horizontal strips (211), and one of the sealing side plates (235) is clamped and installed in the disassembly sliding groove, the two ends of the arc-shaped guide horizontal plate (236) are respectively installed in the two sealing side plates (235), and the bottom of the arc-shaped guide horizontal plate (236) is arrayed with a plurality of collection holes (239), the collection box (237) is installed in the middle of the arc-shaped guide horizontal plate (236), and the plurality of collection holes (239) are in communication with the inner cavity of the collection box (237), and the gas leakage inclined plate (238) is obliquely installed on the inner bottom of the arc-shaped guide horizontal plate (236).

10. The flue gas waste heat utilization system for a power plant boiler according to claim 9, characterized in that: The inner top of each wind gathering inclined plate (222) is provided with an elastic inclined plate (225), the bottom of the elastic inclined plate (225) is provided with a sliding horizontal plate (226), and the inner side of the sliding horizontal plate (226) is slidably attached to the outer wall of the arc-shaped guide horizontal plate (236); the outer wall of the dust removal scraper (234) is rotatably attached to the outer wall of the arc-shaped guide horizontal plate (236).

Images