Flue gas waste heat recycling system

Abstract

The invention discloses a flue gas waste heat recycling system, and relates to the technical field of energy utilization and environmental protection. The device comprises a smoke exhaust pipe, a heat exchange plate is fixed in the smoke exhaust pipe, a waste heat boiler is arranged on one side of the smoke exhaust pipe, the heat exchange plate is connected with the waste heat boiler, a soot cleaning unit is arranged in the smoke exhaust pipe, and the soot cleaning unit comprises a passive filter and an active cleaning piece; the passive filter is fixedly arranged in the smoke exhaust pipe and used for intercepting impurities in airflow penetrating through the smoke exhaust pipe. And the active cleaning part is rotationally arranged in the smoke exhaust pipe, the upper end of the active cleaning part is in rotary contact with the bottom wall of the heat exchange plate, and the active cleaning part is pushed by airflow to actively rotate to scrape impurities attached to the heat exchange plate. According to the device, through combined use of the turbine and the brush plate, automatic cleaning of impurities can be achieved, it is guaranteed that the impurities cannot affect the heat exchange efficiency of the heat exchange plate, rapid dust cleaning is achieved through the air pump, the downtime is shortened, and the requirements of users are met.

Description

Technical Field

[0001] The invention relates to the technical field of energy utilization and environmental protection, and in particular to a flue gas waste heat recovery and utilization system. Background Art

[0002] Flue gas waste heat recovery system is a highly efficient energy recovery technology. The system usually uses heat exchange plates to achieve heat conversion. The most common way to use heat exchange plates is to install them directly inside the exhaust pipe. When the flue gas passes through the heat exchange plate, the heat it carries will be transferred to the medium inside it for other purposes.

[0003] Because the flue gas contains a certain amount of soot and impurities, a dust removal mechanism is also installed inside the existing exhaust pipe, but it cannot be completely removed. The remaining impurities will accumulate on the heat exchange plate and the wall of the exhaust pipe over time, reducing the heat exchange efficiency and clogging the exhaust pipe, causing the device to shut down. The mechanism needs to be cleaned and replaced frequently. Since the mechanism is installed inside the exhaust pipe, it will make replacement more difficult, resulting in excessive downtime, which has limitations.

[0004] The reason for this problem is that by setting up a dust removal mechanism, dust and impurities in the flue gas can be removed to a certain extent, but it is impossible to completely remove them. In the long run, impurities and soot will adhere to the outer surface of the heat exchange plate. The accumulation of soot will increase the thermal resistance of the surface of the heat exchange plate and reduce the heat exchange efficiency. The dust removal mechanism is set inside the exhaust pipe. In order to ensure the dust removal efficiency and the normal circulation of the flue gas, it needs to be replaced and maintained frequently. However, due to the limitation of its position, the replacement and maintenance time will be prolonged, which makes the downtime of the device too long and the waste heat of the flue gas cannot be effectively utilized. There are limitations. Therefore, we propose a flue gas waste heat recovery and utilization system to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a flue gas waste heat recovery and utilization system, which solves the problem that the flue gas contains a certain amount of soot and impurities, and the existing dust removal mechanism is unable to completely remove the dust. The remaining impurities will accumulate on the walls of the heat exchange plate and the exhaust pipe over time, reducing the heat exchange efficiency and clogging the exhaust pipe. In addition, the mechanism needs to be frequently cleaned and replaced, which increases the difficulty of replacement, resulting in excessive downtime and the problem of limitations.

[0006] The present invention is achieved through the following technical solutions: A flue gas waste heat recovery system comprises a smoke exhaust pipe, a heat exchange plate is fixed inside the smoke exhaust pipe, a waste heat boiler is arranged on one side of the smoke exhaust pipe, the heat exchange plate is connected to the waste heat boiler, a soot cleaning unit is arranged inside the smoke exhaust pipe, and the soot cleaning unit comprises a passive filter and an active cleaning member; The passive filter is fixedly arranged inside the smoke exhaust pipe to intercept impurities in the airflow passing through the smoke exhaust pipe; The active cleaning member is rotatably arranged in the smoke exhaust pipe, and the upper end of the active cleaning member is in rotational contact with the bottom wall of the heat exchange plate. The active cleaning member is driven by airflow to actively rotate and scrape off impurities attached to the heat exchange plate.

[0007] Preferably, the passive filter comprises a filter box, an air guide plate and a fixing plate; The air guide plate is fixedly connected to one side of the interior of the filter box, and the fixing plate is fixedly connected to the interior of the filter box.

[0008] Preferably, the passive filter further comprises a bag filter element and a support frame; The bag filter is fixedly connected to the inside of the fixing plate, the bag filter is distributed in an equidistant array, the support frame is arranged inside the bag filter, and the bag filter is fixedly connected to the support frame.

[0009] Preferably, the passive filter further comprises a positioning block, an air bag and an air pump; The positioning block is fixedly connected to one side of the smoke exhaust pipe, the air bag is fixedly connected to the top of the positioning block, the air pump is fixedly connected to one side of the air bag, and the air bag is communicated with the air pump.

[0010] Preferably, the passive filter further comprises an air guide tube, a solenoid valve, a nozzle and a guide frame; The air guide pipe is movably connected to the inside of the filter box, the air guide pipes are distributed in an equidistant array, the air guide pipes are connected to the air bag, the solenoid valve is arranged inside the air guide pipe, the nozzle is arranged inside the filter box, the nozzle is connected to the air guide pipe, and the guide frame is fixedly connected to the top of the filter box.

[0011] Preferably, the active cleaning member comprises a turbine, a brush plate, a first fixing frame, a rotating shaft support rod and a second fixing frame; The first fixed frame is fixedly connected to the inside of the smoke exhaust pipe, the turbine is rotatably connected to the bottom of the first fixed frame, the rotating shaft passes through the first fixed frame, the rotating shaft is fixedly connected to the turbine, the support rod is fixedly connected to the inside of the rotating shaft, the brush plate is fixedly connected to the end of the support rod, and the second fixed frame is arranged above the rotating shaft, and the second fixed frame is rotatably connected to the rotating shaft.

[0012] Preferably, the brush plate comprises a first brush head and a second brush head; The end of the first brush head abuts against the inner wall of the heat exchange plate, the second brush head is fixedly connected to the bottom of the first brush head, and the end of the second brush head abuts against the bottom of the heat exchange plate.

[0013] Preferably, a smoke inlet pipe is provided on one side of the smoke exhaust pipe, the smoke inlet pipe is communicated with the filter box, and an ash collecting hopper is fixedly connected to the bottom of the smoke exhaust pipe.

[0014] Preferably, the waste heat boiler comprises a furnace body and a heating plate; the heating plate is arranged inside the furnace body; A heat conduction pipe is arranged on one side of the smoke exhaust pipe, one end of the heat conduction pipe is connected to the heat exchange plate, and the other end of the heat conduction pipe is connected to the heating plate.

[0015] Through the above technical solution, the beneficial effects of the present invention are: 1. The device uses a combination of a turbine and a brush plate to automatically clean impurities attached to the heat exchange plate without a driving part, ensuring that the impurities will not affect the heat exchange efficiency of the heat exchange plate, and the scraped impurities will fall into the ash hopper due to gravity and will not block the normal use of the exhaust pipe.

[0016] 2. The flue gas enters the filter box through the smoke inlet pipe. The bag filter inside can quickly filter the incoming flue gas. Impurities and dust will adhere to the outer surface of the bag filter. The clean flue gas will continue to flow to the upper end of the exhaust pipe and can be used by the heat exchange plate to ensure the effective use of the waste heat of the flue gas.

[0017] 3. The device can quickly clean the bag filter through the combined use of an air pump and a nozzle, without opening the exhaust pipe or removing the filter box, which reduces the maintenance time, greatly reduces the downtime, improves the maintenance efficiency, and meets the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the interior of the smoke exhaust pipe of the present invention; Figure 3 It is a schematic diagram of the turbine and heat exchange plate of the present invention; Figure 4 This is a schematic diagram of the brush plate structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the filter of the present invention; Figure 6 A top view of the internal structure of the bag filter of the present invention; Figure 7 It is a schematic diagram of the heat exchange plate and heat pipe structure of the present invention.

[0019] In the figure: 1. exhaust pipe; 2. heat exchange plate; 3. waste heat boiler; 31. furnace body; 32. heating plate; 4. ash cleaning unit; 41. passive filter; 411. filter box; 412. air guide plate; 413. fixing plate; 414. bag filter; 415. support frame; 416. positioning block; 417. air bag; 418. air pump; 419. air guide pipe; 420. solenoid valve; 421. nozzle; 422. guide frame; 42. turbine; 43. brush plate; 431. first brush head; 432. second brush head; 44. smoke inlet pipe; 45. ash hopper; 46. first fixing frame; 47. rotating shaft; 48. support rod; 49. second fixing frame; 5. heat pipe. DETAILED DESCRIPTION

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. 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] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention. Example

[0022] like Figure 1-Figure 7 As shown, a flue gas waste heat recovery and utilization system includes a smoke exhaust pipe 1, a heat exchange plate 2 is fixed inside the smoke exhaust pipe 1, a waste heat boiler 3 is arranged on one side of the smoke exhaust pipe 1, the heat exchange plate 2 is connected to the waste heat boiler 3, and an ash cleaning unit 4 is arranged inside the smoke exhaust pipe 1, and the ash cleaning unit 4 includes a passive filter 41 and an active cleaning member; the passive filter 41 is fixedly arranged inside the smoke exhaust pipe 1 to intercept impurities in the airflow passing through the smoke exhaust pipe 1; the active cleaning member is rotatably arranged in the smoke exhaust pipe 1, and the upper end of the active cleaning member is in rotational contact with the bottom wall of the heat exchange plate 2, and the active cleaning member is pushed by the airflow to realize active rotation to scrape off impurities attached to the heat exchange plate 2.

[0023] The passive filter 41 includes a filter box 411, an air guide plate 412 and a fixing plate 413; the air guide plate 412 is fixedly connected to one side of the filter box 411, and the fixing plate 413 is fixedly connected to the inside of the filter box 411. The passive filter 41 also includes a bag filter 414 and a support frame 415; the bag filter 414 is fixedly connected to the inside of the fixing plate 413, and the bag filter 414 is arranged in an equidistant array. The support frame 415 is arranged inside the bag filter 414, and the bag filter 414 is fixedly connected to the support frame 415. The passive filter 41 also includes a positioning block 416, an air bag 417 and an air pump 418; the positioning block 416 is fixedly connected to one side of the exhaust pipe 1, and the air bag 417 is fixedly connected to the exhaust pipe 1. Connected to the top of the positioning block 416, the air pump 418 is fixedly connected to one side of the air bag 417, the air bag 417 is connected to the air pump 418, the passive filter 41 also includes an air guide pipe 419, a solenoid valve 420, a nozzle 421 and a guide frame 422; the air guide pipe 419 is movably connected to the inside of the filter box 411, the air guide pipes 419 are arranged in an equidistant array, the air guide pipe 419 is connected to the air bag 417, the solenoid valve 420 is arranged inside the air guide pipe 419, the nozzle 421 is arranged inside the filter box 411, the nozzle 421 is connected to the air guide pipe 419, the guide frame 422 is fixedly connected to the top of the filter box 411, and the opening and closing of the single pipeline of the air guide pipe 419 is controlled by the solenoid valve 420; It ensures that the air duct 419 can only clean one row of bag filters 414 at a time, because cleaning all bag filters 414 at the same time will cause uneven airflow distribution, resulting in poor cleaning effect of some bag filters 414. Cleaning row by row can ensure that each bag filter 414 can be fully sprayed, thereby improving the cleaning effect, and cleaning all bag filters 414 at the same time, the bag filters 414 will impact each other, causing self-wear and shortening the service life of the bag filters 414, and cleaning row by row can reduce the impact and wear on the bag filters 414, thereby extending the service life of the bag filters 414 and meeting the needs of users; A support frame 415 is provided inside the bag filter 414. The support frame 415 is composed of two groups of fixing rings and four fixing columns. The fixing rings are fixedly connected to the bag filter 414, and the fixing rings are connected by fixing columns. The combination of the fixing rings and the fixing columns ensures that the bag filter 414 will not shrink into a ball after being impacted by the smoke, thereby affecting the circulation of the smoke. The fixing rings and the fixing columns create a passage for the circulation of the smoke inside the bag filter 414, thereby ensuring the normal circulation of the smoke, ensuring the normal use of the device, and meeting the needs of the user.

[0024] The active cleaning member includes a turbine 42, a brush plate 43, a first fixing frame 46, a rotating shaft 47, a support rod 48, and a second fixing frame 49; the first fixing frame 46 is fixedly connected to the inside of the smoke exhaust pipe 1, the turbine 42 is rotatably connected to the bottom of the first fixing frame 46, the rotating shaft 47 passes through the first fixing frame 46, the rotating shaft 47 is fixedly connected to the turbine 42, the support rod 48 is fixedly connected to the inside of the rotating shaft 47, the brush plate 43 is fixedly connected to the end of the support rod 48, the second fixing frame 49 is arranged above the rotating shaft 47, and the second fixing frame 49 is connected to the rotating shaft 4 7 is rotatably connected, the brush plate 43 includes a first brush head 431 and a second brush head 432; the end of the first brush head 431 is against the inner wall of the heat exchange plate 2, the second brush head 432 is fixedly connected to the bottom of the first brush head 431, and the end of the second brush head 432 is against the bottom of the heat exchange plate 2. A smoke inlet pipe 44 is provided on one side of the smoke exhaust pipe 1, and the smoke inlet pipe 44 is connected to the filter box 411. An ash hopper 45 is fixedly connected to the bottom of the smoke exhaust pipe 1. The waste heat boiler 3 includes a furnace body 31 and a heating plate 32; the heating plate 32 is arranged on the furnace body 31. 1; a heat pipe 5 is arranged on one side of the exhaust pipe 1, one end of the heat pipe 5 is connected to the heat exchange plate 2, and the other end of the heat pipe 5 is connected to the heating plate 32. A heat transfer medium is arranged inside the heat pipe 5. The heat exchange plate 2 absorbs the heat from the flue gas, heats the medium inside the heat pipe 5, and transmits it to the inside of the heating plate 32 through the heat pipe 5, heats the water inside the waste heat boiler 3, so that the water vapor passes through the furnace body 31 and is discharged from the top pipeline for power generation or other uses, thereby completing the recovery and reuse of the waste heat of the flue gas. So why not directly use the flue gas inside the flue to generate electricity? Because the flue gas contains corrosive substances, such as sulfur oxides, these substances will produce acidic substances during the combustion process, causing corrosion to the power generation equipment, and the energy utilization efficiency of directly burning the flue gas for power generation is much lower than the efficiency of recovering waste heat using equipment such as the waste heat boiler 3. Equipment such as the waste heat boiler 3 can convert the waste heat of the flue gas into steam or hot water, and then drive the steam turbine or generator to generate electricity, thereby realizing efficient utilization of energy and meeting the needs of users.

[0025] In summary, compared with the prior art, the device has the following beneficial effects: when the device is used, smoke enters the interior of the smoke exhaust pipe 1 through the smoke inlet pipe 44, and a portion of the agglomerated dust falls into the interior of the ash hopper 45 under the influence of gravity and is collected; At the same time, the smoke enters the interior of the filter box 411, hits the air guide plate 412, and contacts the bag filter 414 under the guidance of the air guide plate 412. Since the bag filter 414 is a hollow structure, most of the dust in the smoke is blocked outside by the bag filter 414. Since the hot air always continues to go upward, the cleaned smoke continues to go upward along the inside of the bag filter 414. At this time, the cleaned flue gas blows the turbine 42, and the turbine 42 drives the rotating shaft 42 to rotate, and the support rod 48 fixed on the outer surface of the rotating shaft 42 also rotates synchronously, and the first brush head 431 and the second brush head 432 fixed on the end of the support rod 48 also rotate accordingly. During this period, the first brush head 431 and the second brush head 432 continuously brush the inner wall and the bottom of the heat exchange plate 2, ensuring that impurities and dust will not adhere to the outer surface of the heat exchange plate 2, ensuring the heat exchange efficiency of the heat exchange plate 2, and the first brush head 431 and the second brush head 432 are made of high temperature resistant materials, will not melt or deform during use, and meet the use requirements. When the bag filter 414 needs to be cleaned, the air pump 418 is started, and the air pump 418 blows the gas into the interior of the air bag 417, passes through the air duct 419, and is sprayed out through the nozzle 421, so as to blow off the dust and impurities attached to the outer surface of the bag filter 414. Under the influence of gravity, the dust and impurities fall into the interior of the ash collecting hopper 45, thereby realizing automatic collection of dust and impurities, and the opening and closing of a single pipeline of the air duct 419 is controlled by the solenoid valve 420, thereby ensuring that the air duct 419 can only clean one row of bag filters 414, thereby meeting the needs of users.

[0026] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas waste heat recovery system, comprising a smoke exhaust pipe (1), a heat exchange plate (2) being fixed inside the smoke exhaust pipe (1), a waste heat boiler (3) being arranged on one side of the smoke exhaust pipe (1), the heat exchange plate (2) being connected to the waste heat boiler (3), characterized in that: A soot cleaning unit (4) is arranged inside the smoke exhaust pipe (1), and the soot cleaning unit (4) comprises a passive filter (41) and an active cleaning element; The passive filter (41) is fixedly arranged inside the smoke exhaust pipe (1) and is used to intercept impurities in the airflow passing through the smoke exhaust pipe (1); The active cleaning member is rotatably arranged in the smoke exhaust pipe (1), and the upper end of the active cleaning member is in rotational contact with the bottom wall of the heat exchange plate (2). The active cleaning member is pushed by airflow to achieve active rotation, thereby scraping off impurities attached to the heat exchange plate (2).

2. A flue gas waste heat recovery system according to claim 1, characterized in that: The passive filter (41) comprises a filter box (411), an air guide plate (412) and a fixing plate (413); The air guide plate (412) is fixedly connected to one side of the interior of the filter box (411), and the fixing plate (413) is fixedly connected to the interior of the filter box (411).

3. A flue gas waste heat recovery system according to claim 2, characterized in that: The passive filter (41) further comprises a bag filter element (414) and a support frame (415); The bag filter elements (414) are fixedly connected to the interior of the fixing plate (413); the bag filter elements (414) are distributed in an equidistant array; the support frame (415) is disposed inside the bag filter elements (414); and the bag filter elements (414) are fixedly connected to the support frame (415).

4. The flue gas waste heat recovery system according to claim 2, characterized in that: The passive filter (41) further comprises a positioning block (416), an air bag (417) and an air pump (418); The positioning block (416) is fixedly connected to one side of the smoke exhaust pipe (1), the air bag (417) is fixedly connected to the top of the positioning block (416), the air pump (418) is fixedly connected to one side of the air bag (417), and the air bag (417) is in communication with the air pump (418).

5. The flue gas waste heat recovery system according to claim 4, characterized in that: The passive filter (41) further comprises an air guide tube (419), a solenoid valve (420), a nozzle (421) and a guide frame (422); The air guide pipe (419) is movably clamped inside the filter box (411); the air guide pipes (419) are distributed in an equidistant array; the air guide pipes (419) are connected to the air bag (417); the solenoid valve (420) is arranged inside the air guide pipe (419); the nozzle (421) is arranged inside the filter box (411); the nozzle (421) is connected to the air guide pipe (419); and the guide frame (422) is fixedly connected to the top of the filter box (411).

6. The flue gas waste heat recovery system according to claim 1, characterized in that: The active cleaning member comprises a turbine (42), a brush plate (43), a first fixing frame (46), a rotating shaft (47), a support rod (48) and a second fixing frame (49); The first fixing frame (46) is fixedly connected to the inside of the smoke exhaust pipe (1); the turbine (42) is rotatably connected to the bottom of the first fixing frame (46); the rotating shaft (47) passes through the first fixing frame (46); the rotating shaft (47) is fixedly connected to the turbine (42); the support rod (48) is fixedly connected to the inside of the rotating shaft (47); the brush plate (43) is fixedly connected to the end of the support rod (48); the second fixing frame (49) is arranged above the rotating shaft (47); and the second fixing frame (49) is rotatably connected to the rotating shaft (47).

7. The flue gas waste heat recovery system according to claim 6, characterized in that: The brush plate (43) comprises a first brush head (431) and a second brush head (432); The end of the first brush head (431) abuts against the inner wall of the heat exchange plate (2), and the second brush head (432) is fixedly connected to the bottom of the first brush head (431), and the end of the second brush head (432) abuts against the bottom of the heat exchange plate (2).

8. The flue gas waste heat recovery system according to claim 1, characterized in that: A smoke inlet pipe (44) is provided on one side of the smoke exhaust pipe (1), the smoke inlet pipe (44) is connected to the filter box (411), and an ash collecting hopper (45) is fixedly connected to the bottom of the smoke exhaust pipe (1).

9. The flue gas waste heat recovery system according to claim 1, characterized in that: The waste heat boiler (3) comprises a furnace body (31) and a heating plate (32); the heating plate (32) is arranged inside the furnace body (31); A heat conduction pipe (5) is provided on one side of the smoke exhaust pipe (1); one end of the heat conduction pipe (5) is connected to the heat exchange plate (2), and the other end of the heat conduction pipe (5) is connected to the heating plate (32).

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