Boiler flue gas waste heat recovery device

Abstract

The invention relates to the technical field of resource recycling, and provides a boiler flue gas waste heat recovery device which is used for treating flue gas generated in a boiler and comprises a denitration device, an electrostatic fabric filter, two waste heat recovery devices, a desulfurization device, two liquid storage tanks and a discharging device. The boiler comprises a combustion cavity and a steam cavity. The waste heat recovery device is provided with a gas cavity and a liquid cavity; the combustion cavity, the denitration device, the electrostatic fabric filter, the first gas cavity, the desulfurization device, the second gas cavity and the discharge device are communicated in sequence; the two liquid storage tanks communicate with the two liquid cavities correspondingly and communicate with the steam cavity. By means of the technical scheme, the problem that in the prior art, smoke generated by a boiler still has the high temperature but cannot be utilized after being treated is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of resource recovery and utilization, and in particular to a boiler flue gas waste heat recovery device. Background Art

[0002] In the current field of energy utilization, boilers, as an important energy conversion equipment, are widely used in many industries such as industrial production and power supply. However, during the operation of the boiler, a large amount of flue gas is generated, which contains a variety of pollutants, such as nitrogen oxides, dust, sulfur dioxide, etc., which will cause serious pollution to the environment. Therefore, it is usually necessary to carry out a series of purification treatments on the flue gas generated by the boiler to reduce its harm to the environment.

[0003] In the existing technology, the treated flue gas still has a relatively high temperature, and this part of the heat is often directly discharged into the environment and is not effectively utilized, which not only causes a large amount of energy waste, but also increases the energy cost of the enterprise to a certain extent. Summary of the invention

[0004] The present invention proposes a boiler flue gas waste heat recovery device, which solves the problem in the related art that the flue gas generated by the boiler still has a high temperature after being treated but cannot be used.

[0005] The technical solution of the present invention is as follows: A boiler flue gas waste heat recovery device, used to treat flue gas generated in a boiler, comprises a denitration device, an electric bag composite dust collector, two waste heat recovery devices, a desulfurization device, two liquid storage tanks and a discharge device; The boiler has a combustion chamber and a steam chamber; the waste heat recovery device has a gas chamber and a liquid chamber; The combustion chamber, the denitration device, the electric bag composite dust collector, the first gas chamber, the desulfurization device, the second gas chamber and the discharge device are connected in sequence; The two liquid storage tanks are respectively communicated with the two liquid chambers, and are both communicated with the steam chamber.

[0006] Optionally, it also includes: A deaerator, wherein two ends of the deaerator are respectively connected with the liquid chamber and the steam chamber.

[0007] Optionally, the waste heat recovery device comprises: An outer shell having an air inlet and an air outlet; An inner shell, wherein the inner shell is disposed in the outer shell, the gas cavity is formed between the inner shell and the outer shell, and the gas inlet and the gas outlet are both connected to the gas cavity; The liquid cavity is formed inside the inner shell. The inner shell has a liquid inlet and a liquid outlet. Both the liquid inlet and the liquid outlet are communicated with the liquid cavity.

[0008] Optionally, it also includes: A partition, wherein there are two partitions, and the two partitions are arranged in the inner shell at intervals to divide the liquid cavity into a first cavity, a second cavity and a third cavity which are arranged in sequence; The partition has a plurality of through holes, and the first cavity, the second cavity and the third cavity are sequentially connected through the through holes.

[0009] Optionally, it also includes: A central shaft, the central shaft being vertically slidably disposed in the inner shell; Mounting plates, two of which are arranged vertically on the central axis at intervals, and the two mounting plates are located in the first cavity and the third cavity respectively; A plug, wherein the plug is in a plurality of numbers, and the plurality of plugs are respectively arranged on the two mounting plates, and the plugs on the two mounting plates are close to each other; After the central axis slides vertically upward, the mounting plate in the third cavity approaches the partition plate, so that the plug blocks the through hole, and the second cavity is no longer connected to the third cavity; After the central axis slides down vertically, the mounting plate in the first cavity approaches the partition plate, so that the plug blocks the through hole, thereby eliminating the communication between the first cavity and the second cavity.

[0010] Optionally, it also includes: A cleaning plate, the cleaning plate is arranged on the central axis, and the cleaning plate is located in the second cavity; A cleaning rod, wherein the cleaning rods are in a plurality of numbers and are arranged on the cleaning plate, and the two ends of the cleaning rods are respectively located on the upper and lower sides of the cleaning plate; Cleaning brushes, which are used in pairs and are respectively arranged at both ends of the cleaning rod; After the central shaft slides vertically upward, the cleaning brush member close to the first cavity enters the through hole; After the central axis slides down vertically, the cleaning brush member close to the third cavity enters the through hole.

[0011] Optionally, the cleaning plate has a sleeve, and the interior of the sleeve has a spiral protrusion; The cleaning brush is rotatably arranged on the cleaning rod, the outer wall of the cleaning brush has a spiral groove, and the spiral protrusion is engaged with the spiral groove; The cleaning rod is vertically slidably arranged on the cleaning plate, and the cleaning brush member is rotated after the cleaning rod slides.

[0012] Optionally, it also includes: An abutment rod, the abutment rod is vertically slidably disposed on the cleaning plate; A first connecting rod, one end of which is hingedly arranged on the abutting rod; a second connecting rod, the second connecting rod being hingedly arranged on the cleaning plate, and the other end of the first connecting rod being slidably arranged on one end of the second connecting rod; a third connecting rod, one end of which is slidably arranged on the other end of the second connecting rod, and the other end of which is hingedly arranged on the cleaning rod; After the cleaning plate slides vertically upward, the abutment rod contacts the partition plate, causing the abutment rod to slide vertically downward; the first connecting rod slides downward, driving the second connecting rod to swing, causing the third connecting rod to slide upward, driving the cleaning rod to slide.

[0013] Optionally, it also includes: An elastic member is arranged in the sleeve, and two ends of the elastic member act on the cleaning plate and the cleaning rod respectively to provide a force for the cleaning rod to reset and slide.

[0014] Optionally, the central axis coincides with the axis of the inner shell.

[0015] The working principle and beneficial effects of the present invention are: In the present invention, a complete flue gas treatment and waste heat recovery process is realized. By connecting multiple purification treatment equipment in series, the flue gas generated by the boiler is treated in multiple steps, which ensures the cleanliness of flue gas emissions, reduces pollutant emissions, and meets environmental protection requirements. At the same time, the waste heat recovery device is used to recover the heat in the flue gas, realizes the secondary utilization of energy, transfers the originally wasted heat to the liquid in the liquid storage tank, improves the energy utilization efficiency of the entire system, reduces energy consumption, brings economic benefits to the enterprise, and complies with the environmental protection and energy policies of energy conservation and emission reduction, reducing thermal pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0017] Figure 1 It is a schematic diagram of the process structure of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the cleaning plate structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the cleaning plate of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the internal structure of the cleaning plate of the present invention in another state; Fig. 9 For the present invention Figure 8 Enlarged view of center C.

[0018] In the figure: 1. boiler, 2. denitration device, 3. electric bag composite dust collector, 5. desulfurization device, 6. waste heat recovery device, 7. liquid storage tank, 8. discharge device, 101. combustion chamber, 102. steam chamber, 601. gas chamber, 602. liquid chamber, 9. deaerator, 10. outer shell, 11. inner shell, 12. partition, 6021. first chamber, 6022. second chamber, 6023. third chamber, 1201. through hole, 13. central axis, 14. mounting plate, 15. plug, 16. cleaning plate, 17. cleaning rod, 18. cleaning brush, 19. sleeve, 1901. spiral protrusion, 1801. spiral groove, 20. abutment rod, 21. first connecting rod, 22. second connecting rod, 23. third connecting rod, 24. elastic member. DETAILED DESCRIPTION In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0019] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0020] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] Reference Figure 1 to Figure 9 , which is the first embodiment of the present invention, proposes a boiler flue gas waste heat recovery device for treating the flue gas generated in the boiler 1, including a denitrification device 2, an electric bag composite dust collector 3, two waste heat recovery devices 6, a desulfurization device 5, two liquid storage tanks 7 and an emission device 8; the boiler 1 has a combustion chamber 101 and a steam chamber 102; the waste heat recovery device 6 has a gas chamber 601 and a liquid chamber 602; the combustion chamber 101, the denitrification device 2, the electric bag composite dust collector 3, the first gas chamber 601, the desulfurization device 5, the second gas chamber 601 and the emission device 8 are connected in sequence; the two liquid storage tanks 7 are respectively connected to the two liquid chambers 602, and are both connected to the steam chamber 102.

[0023] In this embodiment, the denitrification device 2 is used to remove nitrogen oxides from the flue gas to reduce environmental pollution; the electric bag composite dust collector efficiently filters dust and improves the cleanliness of the flue gas; two waste heat recovery devices 6, each of which is provided with a gas chamber 601 and a liquid chamber 602; the desulfurization device 5 further removes sulfur dioxide from the flue gas. The liquid storage and circulation component is composed of two liquid storage tanks 7, which are respectively connected to the liquid chambers 602 of the two waste heat recovery devices 6, and are both connected to the steam chamber 102 of the boiler 1, responsible for storing and transporting liquids, and promoting liquid circulation during the waste heat recovery process. The discharge component is the discharge device 8, which is used to discharge the qualified flue gas after treatment and recovery of waste heat into the atmosphere.

[0024] Workflow: The combustion chamber 101 of boiler 1 generates high-temperature flue gas containing multiple pollutants. First, the flue gas enters the denitrification device 2 to remove nitrogen oxides; then it enters the electric bag composite dust collector 3 to remove dust and other particulate matter. The flue gas after preliminary purification enters the gas chamber 601 of the first waste heat recovery device 6, and the liquid (such as desalted water) in the liquid chamber 602 absorbs heat through heat exchange, so that the flue gas is cooled and the liquid is heated. The cooled flue gas enters the desulfurization device 5 to remove sulfur dioxide, and then enters the gas chamber 601 of the second waste heat recovery device 6 to further recover waste heat. The heated liquid in the liquid chamber 602 of the two waste heat recovery devices 6 flows into the liquid storage tank 7, and part of the liquid is transported to the steam chamber 102 to participate in the steam cycle of boiler 1 to realize waste heat utilization. Finally, the qualified flue gas after two waste heat recovery and desulfurization treatments is discharged into the atmosphere through the discharge device 8.

[0025] The benefit is that this device has significant advantages. In terms of energy recovery and utilization, the two waste heat recovery devices 6 make full use of the waste heat of the high-temperature flue gas that was originally directly discharged, and convert it into heat energy that can be used for the steam cycle of the boiler 1, reducing the energy cost of the enterprise and improving energy utilization efficiency. In terms of environmental benefits, the flue gas is denitrified, dusted and desulfurized before waste heat recovery, which greatly reduces the emission of pollutants such as nitrogen oxides, dust and sulfur dioxide, meets environmental protection requirements, and reduces pollution to the environment. In terms of system stability, the setting of the liquid storage tank 7 ensures the stability of the liquid circulation during the waste heat recovery process, ensuring the continuous and efficient operation of the waste heat recovery device 6, thereby ensuring the stable operation of the entire flue gas treatment and waste heat recovery system.

[0026] Furthermore, a deaerator 9 is included, and two ends of the deaerator 9 are connected to the liquid chamber 602 and the steam chamber 102 respectively.

[0027] In this embodiment, the deaerator 9 is composed of a deaerator head and a deaerator water tank, and the deaerator head is provided with key components such as a rotary film group, a water sprinkling grate, and a heat storage filler to achieve efficient deaeration. Through pipeline connection, the deaerator 9 establishes a passage with the liquid chamber 602 of the two waste heat recovery devices 6 and the steam chamber 102 of the boiler 1, and an electric regulating valve is installed on these connecting pipes. Through intelligent regulation, the liquid flow rate is flexibly adjusted according to the system operating parameters to ensure that the liquid flow between the components is smooth and unobstructed and fully controllable, ensuring the efficient and stable operation of the entire system.

[0028] Working process: Boiler 1 produces high-temperature flue gas containing pollutants, which is first preliminarily purified by denitrification device 2 and electric bag composite dust collector 3 in sequence. The purified flue gas enters the first waste heat recovery device 6, and heat is exchanged between the gas chamber 601 and the liquid in the liquid chamber 602. After the liquid is heated, it flows into the deaerator 9. In the deaerator 9, the liquid is deoxygenated to remove dissolved oxygen and other non-condensable gases. The deoxygenated liquid is transported to the steam chamber 102. The flue gas cooled by the first waste heat recovery device 6 enters the desulfurization device 5 for desulfurization, and then enters the second waste heat recovery device 6 for further recovery of waste heat. The heated liquid in the second waste heat recovery device 6 flows into the deaerator 9 for deoxygenation, and the subsequent processes are the same.

[0029] The advantage is that the deaerator 9 optimizes the liquid circulation of the waste heat recovery system. When the deoxygenated liquid participates in the steam circulation, it can improve the steam quality, reduce the energy loss caused by the high oxygen content of the liquid, and further reduce the energy cost of the enterprise. Removing oxygen from the liquid effectively reduces the corrosion of pipelines and equipment such as the waste heat recovery device 6, the liquid storage tank 7 and the steam chamber 102, reduces the equipment maintenance cost, and extends the service life of the equipment.

[0030] Furthermore, the waste heat recovery device 6 includes an outer shell 10, which has an air inlet and an air outlet; an inner shell 11 is arranged in the outer shell 10, and a gas cavity 601 is formed between the inner shell 11 and the outer shell 10, and the air inlet and the air outlet are both connected to the gas cavity 601; a liquid cavity 602 is formed inside the inner shell 11, and the inner shell 11 has a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are both connected to the liquid cavity 602.

[0031] In this embodiment, the waste heat recovery device 6 has an outer shell 10 and an inner shell 11. The outer shell 10 has an air inlet and an air outlet. The air inlet is used to receive the high-temperature flue gas from the desulfurization device 5, and the air outlet is used to discharge the low-temperature flue gas after heat exchange. The inner shell 11 is installed inside the outer shell 10, so that a relatively closed gas cavity 601 is formed, and the high-temperature flue gas can flow in the gas cavity 601. At the same time, the inside of the inner shell 11 is a liquid cavity 602, and the liquid cavity 602 has a liquid inlet and a liquid outlet. The liquid inlet is connected to the liquid storage tank 7, and the liquid in the liquid storage tank 7 enters the liquid cavity 602 from the liquid inlet, and heat is exchanged with the high-temperature flue gas in the gas cavity 601 in the liquid cavity 602, and the heated liquid flows out from the liquid outlet.

[0032] The advantage is that the structure of the inner and outer shells 10 clearly divides the flow and heat exchange space of the gas and liquid, so that the gas and liquid will not mix with each other, ensuring the independence of their respective flow paths and heat exchange processes.

[0033] Furthermore, it also includes a partition 12, two partitions 12, and the two partitions 12 are arranged in the inner shell 11 at intervals, dividing the liquid cavity 602 into a first cavity 6021, a second cavity 6022 and a third cavity 6023 arranged in sequence; the partition 12 has a plurality of through holes 1201, and the first cavity 6021, the second cavity 6022 and the third cavity 6023 are connected in sequence through the through holes 1201.

[0034] In this embodiment, two partitions 12 are arranged in the inner shell 11, and the two partitions 12 divide the liquid cavity 602 into three parts, namely the first cavity 6021, the second cavity 6022 and the third cavity 6023. There are multiple through holes 1201 on the partition 12, and these through holes 1201 allow liquid to flow between the three cavities. When the liquid enters the liquid cavity 602 from the liquid inlet, it will flow through the first cavity 6021, the second cavity 6022 and the third cavity 6023 in sequence.

[0035] The advantage is that by dividing the liquid chamber 602 into three chambers and separating them with the partition 12, the flow path of the liquid in the liquid chamber 602 becomes more complex and tortuous, which increases the residence time of the liquid in the liquid chamber 602. In this way, the contact time between the liquid and the high-temperature flue gas in the gas chamber 601 is longer, the heat exchange is more sufficient, the heat of the flue gas can be absorbed more effectively, and the heat exchange efficiency of the waste heat recovery device 6 is improved.

[0036] Furthermore, it also includes a central axis 13, which is vertically slidably arranged in the inner shell 11; there are two mounting plates 14, which are vertically spaced on the central axis 13, and the two mounting plates 14 are respectively located in the first cavity 6021 and the third cavity 6023; there are a number of plugs 15, and the plugs 15 are respectively arranged on the two mounting plates 14, and the plugs 15 on the two mounting plates 14 are close to each other; after the central axis 13 slides vertically upward, the mounting plate 14 in the third cavity 6023 approaches the partition 12, so that the plug 15 blocks the through hole 1201, and the second cavity 6022 and the third cavity 6023 are cancelled; after the central axis 13 slides vertically downward, the mounting plate 14 in the first cavity 6021 approaches the partition 12, so that the plug 15 blocks the through hole 1201, and the first cavity 6021 and the second cavity 6022 are cancelled.

[0037] In this embodiment, when the boiler 1 starts to operate, the high-temperature flue gas generated by the combustion of the fuel in the combustion chamber 101 will pass through the denitrification device 2, the electric bag composite dust collector 3, the gas chamber 601 of the first waste heat recovery device 6 and the desulfurization device 5 in sequence and then enter the gas chamber 601 of the second waste heat recovery device 6. At the same time, the liquid in the liquid storage tank 7 is introduced into the liquid chamber 602 of the waste heat recovery device 6 through a pipeline.

[0038] In the initial state, the central axis 13 is in a proper position to ensure that the first cavity 6021 and the second cavity 6022 are connected, and the liquid can enter the first cavity 6021 from the liquid inlet. When the liquid begins to enter the first cavity 6021, the central axis 13 slides downward, so that the through hole 1201 between the first cavity 6021 and the second cavity 6022 is blocked by the plug 15, and the liquid begins to gather in the first cavity 6021. Through the liquid level monitoring device set in the first cavity 6021, when the liquid in the first cavity 6021 gathers to a predetermined amount, the central axis 13 starts to slide upward, and the plug 15 leaves the through hole 1201, connecting the first cavity 6021 and the second cavity 6022. At this time, the liquid in the first cavity 6021 flows into the second cavity 6022 under the action of pressure difference and gravity. As the liquid flows into the second cavity 6022, the liquid level in the second cavity 6022 continues to rise. When the set liquid level is reached, the central shaft 13 is slid up again, so that the through hole 1201 between the first cavity 6021 and the second cavity 6022 is re-blocked by the plug 15, and the second cavity 6022 and the third cavity 6023 are connected at the same time. At this time, the liquid in the second cavity 6022 flows into the third cavity 6023. In the whole process, according to the information fed back by the liquid level sensors of different cavities, the sliding operation of the central shaft 13 is accurately controlled to ensure that the liquid flows in the three cavities in an orderly manner according to the above-mentioned predetermined process.

[0039] In order to ensure smooth sliding of the central shaft 13 , a sliding bearing may be installed at the connection between the central shaft 13 and the inner housing 11 to prevent the sliding performance of the central shaft 13 from being affected due to excessive friction.

[0040] The advantage is that this structure that can accurately control the flow of liquid in the three cavities makes the flow of liquid more orderly and controllable. By controlling the sliding of the central axis 13 according to the liquid level, the liquid can stay in each cavity for a sufficient time to achieve more adequate heat exchange. Compared with the simple continuous flow method, this quantitative control method can better match flue gases of different temperatures and flow rates, optimize the heat exchange process between liquid and flue gas, and improve the heat exchange efficiency of the waste heat recovery device 6.

[0041] Precise control of liquid flow avoids disordered flow of liquid between different cavities, reduces local overheating or overcooling that may be caused by unstable flow, and ensures the stability and reliability of the heat recovery process. At the same time, by flexibly adjusting the residence time and flow rate of liquid in different cavities, the device can better adapt to different working conditions and operating conditions, improve the adaptability and adjustability of the system, and thus improve the energy utilization efficiency and operating performance of the entire boiler 1 flue gas waste heat recovery device 6.

[0042] Furthermore, it also includes a cleaning plate 16, which is arranged on the central axis 13 and is located in the second cavity 6022; a plurality of cleaning rods 17 are arranged on the cleaning plate 16, and both ends of the cleaning rods 17 are respectively located on the upper and lower sides of the cleaning plate 16; cleaning brushes 18 are used in pairs and are respectively arranged at both ends of the cleaning rods 17; after the central axis 13 slides vertically upward, the cleaning brush 18 close to the first cavity 6021 enters the through hole 1201; after the central axis 13 slides vertically downward, the cleaning brush 18 close to the third cavity 6023 enters the through hole 1201.

[0043] In this embodiment, when the central shaft 13 slides up and down according to the flow control of the liquid in the cavity, the cleaning plate 16 moves accordingly. During the sliding up or down process of the central shaft 13, the cleaning brush 18 will correspondingly enter the through hole 1201 on the partition 12. During operation, the cleaning operation is triggered by the operating state of the device, for example, when the flow of liquid between the cavities is abnormal or a regular time interval arrives, the cleaning process is started.

[0044] After the cleaning brush 18 enters the through hole 1201, it scrapes away possible impurities by contacting the inner wall of the through hole 1201 to ensure smooth flow of the liquid. The cleaning process will be automatically adjusted according to the working state of the cleaning brush 18. When the cleaning brush 18 completes a cleaning cycle, it will wait for the next trigger signal to clean again.

[0045] The advantage is that the cleaning structure can effectively solve the problem of poor liquid flow caused by the accumulation of impurities at the through hole 1201 during the long-term operation of the waste heat recovery device 6. The automatic cleaning of the cleaning brush 18 can maintain the normal flow of liquid between different cavities, ensure that the heat exchange process is not hindered, and avoid affecting the heat exchange performance of the waste heat recovery device 6 due to the accumulation of impurities.

[0046] Furthermore, the cleaning plate 16 has a sleeve 19, and a spiral protrusion 1901 is provided inside the sleeve 19; the cleaning brush 18 is rotatably arranged on the cleaning rod 17, and the outer wall of the cleaning brush 18 has a spiral groove 1801, and the spiral protrusion 1901 is engaged with the spiral groove 1801; the cleaning rod 17 is vertically slidably arranged on the cleaning plate 16, and the cleaning rod 17 slides to rotate the cleaning brush 18.

[0047] In this embodiment, when the cleaning operation starts, as the cleaning rod 17 slides vertically, the cleaning brush 18 rotates due to the effect of the spiral structure. The rotation and sliding actions of the cleaning brush 18 are synchronized. When the cleaning rod 17 slides up and down, the cleaning brush 18 not only moves along the axial direction of the cleaning rod 17, but also rotates around its own axis to achieve comprehensive cleaning of the through hole 1201.

[0048] The advantage is that the spiral structure enables the cleaning brush 18 to achieve simultaneous axial sliding and rotation, which can more thoroughly remove impurities in the through hole 1201 compared to cleaning by linear motion alone, greatly improving the cleaning efficiency and effect. The through hole 1201 of the waste heat recovery device 6 is kept in a good conductive state, improving the operating stability and reliability of the equipment, thereby ensuring the heat exchange efficiency and system performance of the entire device.

[0049] Furthermore, it also includes an abutment rod 20, which is vertically slidably set on the cleaning plate 16; one end of the first connecting rod 21 is hingedly set on the abutment rod 20; the second connecting rod 22 is hingedly set on the cleaning plate 16, and the other end of the first connecting rod 21 is slidably set on one end of the second connecting rod 22; one end of the third connecting rod 23 is slidably set on the other end of the second connecting rod 22, and the other end of the third connecting rod 23 is hingedly set on the cleaning rod 17; after the cleaning plate 16 slides vertically upward, the abutment rod 20 contacts with the partition 12, causing the abutment rod 20 to slide vertically downward; the first connecting rod 21 slides down, driving the second connecting rod 22 to swing, causing the third connecting rod 23 to slide up, and driving the cleaning rod 17 to slide.

[0050] In the present embodiment, when the cleaning plate 16 slides vertically upward along with the central axis 13, the abutment rod 20 contacts the partition 12, driving the first connecting rod 21 to slide down, the first connecting rod 21 drives the second connecting rod 22 to swing, the second connecting rod 22 drives the third connecting rod 23 to slide up, and then drives the cleaning rod 17 to slide upward. When the cleaning plate 16 slides vertically downward, this connecting rod mechanism produces opposite motion, realizing the automatic sliding control of the cleaning rod 17. The entire connecting rod mechanism can automatically adjust the position of the cleaning rod 17 according to the needs of the cleaning operation, and its movement process does not require an additional power source, and is only realized by the relative movement of the cleaning plate 16 and the partition 12. The movement logic of this connecting rod mechanism is closely matched with the sliding action of the cleaning plate 16 to ensure that the cleaning rod 17 can be correctly in place at different cleaning stages.

[0051] The advantage is that the design of the connecting rod mechanism realizes the automatic driving of the cleaning rod 17 without the need for an additional power source, thus simplifying the equipment structure and reducing the equipment cost.

[0052] Furthermore, an elastic member 24 is included. The elastic member 24 is arranged in the sleeve 19. Two ends of the elastic member 24 act on the cleaning plate 16 and the cleaning rod 17 respectively to provide a force for the cleaning rod 17 to return to slide.

[0053] In this embodiment, when the cleaning rod 17 slides due to the cleaning operation, the elastic member 24 is stretched or compressed. When the cleaning operation is completed, the elastic member 24 will use its own elastic force to reset the cleaning rod 17. The elastic member 24 plays a role of reset and assistance in the entire cleaning process, ensuring that the cleaning rod 17 returns to the predetermined position after the cleaning is completed. Its reset function is automatically triggered by the cycle of the cleaning operation, ensuring that the position of the cleaning rod 17 is always in a normal working state.

[0054] The advantage is that the reset function of the elastic member 24 reduces the risk of cleaning failure due to abnormal position of the cleaning rod 17, improves the reliability of the cleaning device, ensures the stable operation of the waste heat recovery device 6, and extends the service life of the equipment.

[0055] Furthermore, the central axis 13 coincides with the axis of the inner shell 11 .

[0056] In this embodiment, during the installation process, the concentricity of the central shaft 13 and the inner shell 11 is ensured through precise installation technology and calibration means. During the operation of the entire device, the central shaft 13 maintains a uniform and stable sliding motion because it is concentric with the inner shell 11. The concentricity of the central shaft 13 and the inner shell 11 ensures the overall stability of the device.

[0057] The advantage is that the structural design in which the central shaft 13 and the inner shell 11 axis coincide with each other ensures that the central shaft 13 is subjected to uniform force during operation, thereby avoiding additional wear and friction caused by eccentricity.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A boiler flue gas waste heat recovery device for treating flue gas generated in a boiler (1), characterized in that: It comprises a denitration device (2), an electric bag composite dust collector (3), two waste heat recovery devices (6), a desulfurization device (5), two liquid storage tanks (7) and an emission device (8); The boiler (1) comprises a combustion chamber (101) and a steam chamber (102); the waste heat recovery device (6) comprises a gas chamber (601) and a liquid chamber (602); The combustion chamber (101), the denitration device (2), the electric bag composite dust collector (3), the first gas chamber (601), the desulfurization device (5), the second gas chamber (601) and the discharge device (8) are connected in sequence; The two liquid storage tanks (7) are respectively connected to the two liquid chambers (602), and are both connected to the steam chamber (102).

2. A boiler flue gas waste heat recovery device according to claim 1, characterized in that: Also includes: A deaerator (9), wherein the deaerator (9) is in communication with the two liquid chambers (602) and the steam chamber (102).

3. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: The waste heat recovery device (6) comprises: An outer shell (10), the outer shell (10) having an air inlet and an air outlet; an inner shell (11), the inner shell (11) being arranged inside the outer shell (10), the gas cavity (601) being formed between the inner shell (11) and the outer shell (10), the gas inlet and the gas outlet both being in communication with the gas cavity (601); The liquid cavity (602) is formed inside the inner shell (11), and the inner shell (11) has a liquid inlet and a liquid outlet, and both the liquid inlet and the liquid outlet are in communication with the liquid cavity (602).

4. A boiler flue gas waste heat recovery device according to claim 3, characterized in that: Also includes: a partition plate (12), wherein two partition plates (12) are provided, and the two partition plates (12) are arranged in the inner shell (11) at intervals, so as to divide the liquid cavity (602) into a first cavity (6021), a second cavity (6022), and a third cavity (6023) arranged in sequence; The partition plate (12) has a plurality of through holes (1201), and the first cavity (6021), the second cavity (6022) and the third cavity (6023) are sequentially connected through the through holes (1201).

5. A boiler flue gas waste heat recovery device according to claim 4, characterized in that: Also includes: A central shaft (13), the central shaft (13) being vertically slidably disposed in the inner shell (11); A mounting plate (14), wherein there are two mounting plates (14), the mounting plates (14) being arranged vertically at intervals on the central axis (13), and the two mounting plates (14) being located in the first cavity (6021) and the third cavity (6023), respectively; A plug (15), wherein the plugs (15) are provided in a plurality, and the plurality of plugs (15) are respectively arranged on two mounting plates (14), and the plugs (15) on the two mounting plates (14) are close to each other; After the central shaft (13) slides vertically upward, the mounting plate (14) in the third cavity (6023) approaches the partition (12), so that the plug (15) blocks the through hole (1201), thereby eliminating the connection between the second cavity (6022) and the third cavity (6023); After the central axis (13) slides down vertically, the mounting plate (14) in the first cavity (6021) approaches the partition (12), so that the plug (15) blocks the through hole (1201), thereby eliminating the connection between the first cavity (6021) and the second cavity (6022).

6. A boiler flue gas waste heat recovery device according to claim 5, characterized in that: Also includes: a cleaning plate (16), the cleaning plate (16) being arranged on the central axis (13), the cleaning plate (16) being located in the second cavity (6022); A cleaning rod (17), wherein the cleaning rod (17) is provided in a plurality of numbers, the cleaning rod (17) is arranged on the cleaning plate (16), and the two ends of the cleaning rod (17) are respectively located on the upper and lower sides of the cleaning plate (16); cleaning brushes (18), the cleaning brushes (18) being used in pairs and being respectively arranged at two ends of the cleaning rod (17); After the central shaft (13) slides vertically upward, the cleaning brush (18) close to the first cavity (6021) enters the through hole (1201); After the central shaft (13) slides down vertically, the cleaning brush (18) close to the third cavity (6023) enters the through hole (1201).

7. A boiler flue gas waste heat recovery device according to claim 6, characterized in that: The cleaning plate (16) has a sleeve (19), and the sleeve (19) has a spiral protrusion (1901) inside; The cleaning brush member (18) is rotatably arranged on the cleaning rod (17); the outer wall of the cleaning brush member (18) has a spiral groove (1801), and the spiral protrusion (1901) is meshed with the spiral groove (1801); The cleaning rod (17) is vertically slidably arranged on the cleaning plate (16), and the cleaning rod (17) causes the cleaning brush (18) to rotate after sliding.

8. The boiler flue gas waste heat recovery device according to claim 6, characterized in that: Also includes: an abutment rod (20), the abutment rod (20) being vertically slidably disposed on the cleaning plate (16); a first connecting rod (21), one end of the first connecting rod (21) being hingedly arranged on the abutting rod (20); a second connecting rod (22), the second connecting rod (22) being hingedly arranged on the cleaning plate (16), and the other end of the first connecting rod (21) being slidably arranged on one end of the second connecting rod (22); A third connecting rod (23), one end of the third connecting rod (23) being slidably arranged on the other end of the second connecting rod (22), and the other end of the third connecting rod (23) being hingedly arranged on the cleaning rod (17); After the cleaning plate (16) slides vertically upward, the abutting rod (20) contacts the partition (12), causing the abutting rod (20) to slide vertically downward, driving the first connecting rod (21) to slide downward, driving the second connecting rod (22) to swing, causing the third connecting rod (23) to slide upward, and driving the cleaning rod (17) to slide.

9. The boiler flue gas waste heat recovery device according to claim 7, characterized in that: Also includes: An elastic member (24), the elastic member (24) being arranged in the sleeve (19), and two ends of the elastic member (24) acting on the cleaning plate (16) and the cleaning rod (17) respectively, for providing a force for the cleaning rod (17) to return to sliding position.

10. The boiler flue gas waste heat recovery device according to claim 5, characterized in that: The central axis (13) coincides with the axis of the inner shell (11).

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