Waste heat recovery device for thermal power station

Abstract

The utility model provides a thermal power station waste heat recovery device, and relates to the technical field of waste heat recovery, the thermal power station waste heat recovery device comprises a recovery frame, a heat exchange pipe is installed in the recovery frame, and windows for waste gas to flow through are formed in the recovery frame and located on the two sides of the heat exchange pipe; the two filter plates are mounted at the windows in the two sides of the recovery frame correspondingly and can be used for filtering dust in the waste gas; and the two sets of cleaning mechanisms are arranged and correspond to the two filter plates in a one-to-one mode, and the cleaning mechanisms are arranged on the recycling frame and can scrape, sweep and clean dust on the filter plates. The waste heat recovery device has the effect that the recovery efficiency of the waste heat recovery device on waste heat in waste gas is improved.

Description

Technical Field

[0001] The present application relates to the technical field of waste heat recovery, and in particular to a waste heat recovery device for a thermal power station. Background Art

[0002] The main function of the waste heat recovery device of a thermal power station is to recover and utilize the waste heat generated during the thermal power generation process. This waste heat is usually generated during the power generation process due to the combustion of fuel and other thermal processes. If it is discharged directly, it will not only cause energy waste, but may also cause thermal pollution to the environment. The waste heat recovery device can extract the waste heat from the power generation process and then convert it into usable heat energy.

[0003] In the related art, a Chinese patent application numbered CN201621380209.6 proposes a low-temperature waste gas waste heat recovery and treatment device, which includes a waste heat recovery device, a maintenance cover, a recovery box, a filter, and a temperature gauge. The waste heat recovery device is arranged in the recovery box, the maintenance cover is movably connected to the recovery box, the recovery box is fixedly connected to the filter, and the temperature gauge is arranged on the recovery box. The waste heat recovery device includes a fixed hole and a water pipe. By providing a filter and a temperature gauge, waste heat monitoring and waste gas emission treatment of the low-temperature waste gas waste heat recovery and treatment device are achieved. The device is provided with a filter at the outlet to filter the waste gas recovered by the waste heat recovery device, thereby preventing dust and dirt in the waste gas from damaging the environment. The temperature gauge provided on the device enables the device to monitor the waste heat, making it convenient for users to adjust the recovery rate according to the waste heat quantity, thereby making greater use of the waste heat recovery problem.

[0004] Regarding the above-mentioned related technologies, during the thermal power generation process, when the exhaust gas flows through the waste heat recovery device, the exhaust gas can heat the water in the water pipe, thereby recovering the heat in the exhaust gas. However, the dust in the exhaust gas will also enter the waste heat recovery device and adhere to the water pipe, reducing the efficiency of the water in the water pipe in recovering the waste heat in the exhaust gas. Utility Model Content

[0005] In order to improve the problem of low efficiency in recovering waste heat in exhaust gas, the present application provides a waste heat recovery device for a thermal power station.

[0006] The waste heat recovery device for a thermal power station provided in this application adopts the following technical solution:

[0007] A waste heat recovery device for a thermal power station, comprising

[0008] A recovery frame, in which a heat exchange tube is installed, and windows for exhaust gas to flow through are opened on both sides of the heat exchange tube;

[0009] There are two filter plates, which are installed at the windows on both sides of the recovery frame and can be used to filter dust in the exhaust gas; and

[0010] There are two groups of cleaning mechanisms, which correspond to the two filter plates respectively. The cleaning mechanisms are arranged on the recovery frame and can scrape and clean the dust on the filter plates.

[0011] Furthermore, the cleaning mechanism includes a cleaning plate and a driving assembly. The cleaning plate slides against the side of the filter plate away from the heat exchange tube. The driving assembly is arranged on the recovery frame and can drive the cleaning plate to reciprocate on the filter plate.

[0012] Furthermore, the driving assembly includes a support plate for fixing the cleaning plate and a driving member for driving the support plate to reciprocate, the driving member is arranged on the recovery frame, and the cleaning plate is located between the support plate and the filter plate.

[0013] Furthermore, the support plate is provided with an elastic pressing member for driving the cleaning plate to press against the filter plate.

[0014] Furthermore, the recovery frame is provided with a guide member for limiting the deflection of the support plate. The guide member and the driving member are respectively located at both ends of the support plate. One end of the support plate is slidingly connected to the guide member, so that under the drive of the driving member, the support plate can drive the cleaning plate to move back and forth stably.

[0015] Furthermore, the bottom edge of the recycling frame window is tilted downward.

[0016] Furthermore, a connector connected to the heat exchange tube is installed on the recovery frame, the connector is located outside the recovery frame, and a purifier is provided between the connector and the heat exchange tube.

[0017] Furthermore, the purifier includes a tank box installed between the connector and the heat exchange tube, and a screen plate arranged in the tank box and used for filtering impurities. The screen plate is detachably installed in the tank box.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. By installing a filter plate at the window of the recovery frame, the dust in the exhaust gas entering the recovery frame can be filtered to prevent the dust in the exhaust gas from entering the recovery frame along with the exhaust gas and adhering to the outer wall of the heat exchange tube, thereby hindering the heat exchange tube's efficiency in recovering the waste heat in the exhaust gas;

[0020] 2. By setting a cleaning mechanism on the recovery frame, the cleaning mechanism can regularly clean the dust on the filter plate, ensuring that the exhaust gas can flow smoothly through the recovery frame, so that the heat exchange pipes in the recovery frame can efficiently recover the waste heat in the exhaust gas;

[0021] 3. Install a purifier at the inlet end of the heat exchange tube so that the purifier can filter impurities in the water flowing into the heat exchange tube to prevent impurities from flowing into the heat exchange tube and adhering to the inner wall of the heat exchange tube, thereby affecting the heat exchange tube's efficiency in recovering waste heat from the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of the explosion structure of the cleaning mechanism in the embodiment of the present application.

[0025] Figure 3 It is a structural diagram of the connector and the purifier in the embodiment of the present application.

[0026] Figure numerals: 1. Recovery frame; 2. Heat exchange tube; 3. Window; 4. Filter plate; 5. Cleaning mechanism; 51. Cleaning plate; 52. Support plate; 53. Screw; 54. Threaded seat; 55. Motor; 6. Elastic clamping member; 7. Guide member; 71. Guide block; 72. Guide rod; 8. Connector; 9. Purifier; 91. Trough box; 92. Screening plate. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The embodiment of the present application discloses a waste heat recovery device for a thermal power station. Figure 1A waste heat recovery device for a thermal power station includes a recovery frame 1, two filter plates 4 and a cleaning mechanism 5. A heat exchange tube 2 is installed in the recovery frame 1, and water flows in the heat exchange tube 2. The recovery frame 1 is provided with windows 3 on both sides of the heat exchange tube 2 for exhaust gas to flow through, so that when the exhaust gas flows into the recovery frame 1 from the window 3 on one side of the recovery frame 1, the waste heat in the exhaust gas can heat the water in the heat exchange tube 2, thereby realizing the recovery of the waste heat in the exhaust gas; after completing the recovery of the waste heat in the exhaust gas, the exhaust gas flows out from the window 3 on the other side of the recovery frame 1, thereby ensuring that the heat exchange tube 2 in the recovery frame 1 can continuously recover the waste heat in the exhaust gas.

[0029] Considering that the exhaust gas generated during thermal power generation is usually mixed with some dust, in order to prevent the dust in the exhaust gas from adhering to the outer wall of the heat exchange tube 2 when flowing through the recovery frame 1, thereby affecting the heat exchange tube 2's recovery efficiency of the waste heat in the exhaust gas, for this purpose, refer to Figure 1 and Figure 2 Two filter plates 4 are respectively installed at the windows 3 on both sides of the recovery frame 1. The filter plate 4 located at the exhaust gas inlet can filter the dust in the exhaust gas, preventing the dust in the exhaust gas from entering the recovery frame 1 along with the exhaust gas and adhering to the outer wall of the heat exchange tube 2, thereby hindering the heat exchange tube 2 from efficiently recovering the waste heat in the exhaust gas; while the filter plate 4 located at the exhaust gas outlet can prevent the dust outside the recovery frame 1 from floating and entering the recovery frame 1, further ensuring the cleanliness of the recovery frame 1 and ensuring that the heat exchange tube 2 can efficiently and quickly complete the recovery of waste heat in the exhaust gas.

[0030] Although the filter plate 4 can filter the dust in the exhaust gas, with long-term use, a large amount of dust will adhere to the filter plate 4, thereby affecting the exhaust gas flow through the recovery frame 1. Figure 1 and Figure 2 Two groups of cleaning mechanisms 5 are provided. The two groups of cleaning mechanisms 5 correspond to the two filter plates 4 one by one, and respectively scrape and clean the dust on the corresponding filter plates 4. The cleaning mechanism 5 includes a cleaning plate 51 and a drive assembly. The cleaning plate 51 slides against the side of the filter plate 4 away from the heat exchange tube 2. The drive assembly is set on the recovery frame 1. The drive assembly drives the cleaning plate 51 to slide back and forth on the filter plate 4, so that the cleaning plate 51 can scrape and clean the dust attached to the filter plate 4, preventing dust from clogging the filter holes on the filter plate 4 and affecting the flow of exhaust gas through the recovery frame 1. The bottom edge of the window 3 of the recovery frame 1 is tilted downward, and the dust scraped off by the cleaning plate 51 can slide away from the recovery frame 1 along the tilt direction of the bottom edge of the window 3.

[0031] For the settings of the drive components, refer to Figure 1 and Figure 2The driving assembly includes a support plate 52 for fixing the cleaning plate 51 and a driving member for driving the support plate 52 to reciprocate. The support plate 52 is located on the side of the cleaning plate 51 away from the filter plate 4. The length direction of the support plate 52 is consistent with the length direction of the cleaning plate 51. The cleaning plate 51 is mounted on the support plate 52. The driving member is disposed on the recovery frame 1. By driving the support plate 52 to reciprocate on one side of the filter plate 4, the driving member enables the cleaning plate 51 to reciprocate and sweep the filter plate 4, thereby reducing the adhesion of dust on the filter plate 4.

[0032] Regarding the arrangement of the driving member, in the embodiment of the present application, refer to Figure 1 and Figure 2 The drive member includes a screw rod 53 rotatably mounted at the window 3 of the recycling frame 1, a threaded seat 54 threadedly mounted on the screw rod 53, and a motor 55 that drives the screw rod 53 in forward and reverse rotation. A slot for rotatably mounting the screw rod 53 is provided on one side of the recycling frame 1 at the window 3. The motor 55 is fixedly mounted on the outer wall of the recycling frame 1, and the output end of the motor 55 extends into the slot and is fixedly connected to the screw rod 53. The length of the screw rod 53 is consistent with the sliding direction of the cleaning plate 51. The screw rod 53 is arranged perpendicular to the cleaning plate 51, and the threaded seat 54 is fixedly mounted on one end of the support plate 52. A guide groove is provided on the other side of the window 3 of the recycling frame 1. The length of the guide groove is consistent with the length of the screw rod 53, and a guide member 7 is provided in the guide groove. The guide member 7 includes a guide rod 72 set parallel to the screw rod 53 and a guide block 71 slidably clamped on the guide rod 72. The guide block 71 is fixedly connected to the end of the support plate 52 away from the threaded seat 54, so that under the drive of the screw rod 53 and the guiding action of the guide member 7, the support plate 52 can drive the cleaning plate 51 to scrape the filter plate 4 back and forth smoothly, avoiding the rotation of the support plate 52 and the cleaning plate 51, which affects the cleaning effect of the filter plate 4.

[0033] In other embodiments, the driving member may also be configured as an electric push rod, a micro cylinder, etc.

[0034] Considering the scraping cleaning effect of the cleaning plate 51 on the filter plate 4, refer to Figure 2 The support plate 52 is provided with an elastic retaining member 6 for pressing the cleaning plate 51 against the filter plate 4. In the embodiment of the present application, the elastic retaining member 6 is configured as a plurality of elastic telescopic rods spaced along the length of the support plate 52. One end of the elastic telescopic rod is fixedly connected to the support plate 52, and the other end is fixedly connected to the cleaning plate 51. The elastic telescopic rods are always in a compressed state, so that the cleaning plate 51 is pressed against the filter plate 4 under the push of the elastic telescopic rods. As the cleaning plate 51 moves, it can fully scrape and clean the dust on the filter plate 4.

[0035] Reference Figure 1 and Figure 3The inlet end of the heat exchange tube 2 passes through the side wall of the recovery frame 1 and extends outside the recovery frame 1. The inlet end of the heat exchange tube 2 is connected to a connector 8 and a purifier 9 in sequence. The connector 8 and the purifier 9 are both located outside the recovery frame 1, and the purifier 9 is located between the connector 8 and the heat exchange tube 2. The connector 8 facilitates the connection of the heat exchange tube 2 with an external water source, allowing water to flow smoothly into the heat exchange tube 2. The use of the purifier 9 can filter impurities in the water flowing into the heat exchange tube 2, preventing impurities from flowing into the heat exchange tube 2 and adhering to the inner wall of the heat exchange tube 2, thereby affecting the efficiency of the heat exchange tube 2 in recovering waste heat from the exhaust gas.

[0036] In order to facilitate regular cleaning of impurities in the purifier 9, refer to Figure 1 and Figure 3 The purifier 9 includes a tank box 91 connected and installed between the connector 8 and the heat exchange tube 2, and a screen plate 92 provided in the tank box 91 and used to filter impurities. The tank box 91 includes a box body and a cover body detachably installed at the top opening of the box body by screws. The screen plate 92 is detachably inserted into the box body. The surface direction of the screen plate 92 is perpendicular to the direction of water flow, so that the screen plate 92 can fully filter impurities in the water. When the screen plate 92 needs to be cleaned regularly, the cover body can be removed from the box body, and the screen plate 92 can be pulled out of the box body for cleaning.

[0037] The implementation principle of the waste heat recovery device of a thermal power station in the embodiment of the present application is as follows: first, the screen plate 92 is taken out of the tank box 91, cleaned, and then put back into the tank box 91, and water is continuously introduced into the heat exchange tube 2 through the connector 8. Then, the exhaust gas generated by thermal power generation is introduced into the recovery frame 1 through the window 3 on one side of the recovery frame 1. At this time, the filter plate 4 located at the exhaust gas inlet can filter the dust in the exhaust gas, preventing the dust in the exhaust gas from entering the recovery frame 1 along with the exhaust gas and adhering to the outer wall of the heat exchange tube 2, thereby hindering the heat exchange tube 2 from recovering the waste heat in the exhaust gas. After completing the recovery of the waste heat in the exhaust gas, the exhaust gas flows out from the window 3 on the other side of the recovery frame 1, thereby ensuring that the heat exchange tube 2 in the recovery frame 1 can continuously recover the waste heat in the exhaust gas.

[0038] When a large amount of dust is found to be accumulated on the filter plate 4, the motor 55 can be started. The motor 55 drives the screw rod 53 to rotate forward and reverse, so that the screw rod 53 drives the support plate 52 to reciprocate on the filter plate 4 through the threaded seat 54, and the cleaning plate 51 on the support plate 52 is pressed against the filter plate 4 under the drive of the elastic pressing member 6, so that the cleaning plate 51 can fully scrape and clean the dust on the filter plate 4.

[0039] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A waste heat recovery device for a thermal power station, characterized in that: include A recovery frame, in which a heat exchange tube is installed, and windows for exhaust gas to flow through are opened on both sides of the heat exchange tube; There are two filter plates, which are installed at the windows on both sides of the recovery frame and can be used to filter dust in the exhaust gas; and There are two groups of cleaning mechanisms, which correspond to the two filter plates respectively. The cleaning mechanisms are arranged on the recovery frame and can scrape and clean the dust on the filter plates.

2. A waste heat recovery device for a thermal power station according to claim 1, characterized in that: The cleaning mechanism includes a cleaning plate and a driving assembly. The cleaning plate slides against the side of the filter plate away from the heat exchange tube. The driving assembly is arranged on the recovery frame and can drive the cleaning plate to reciprocate on the filter plate.

3. A waste heat recovery device for a thermal power station according to claim 2, characterized in that: The driving assembly includes a support plate for fixing the cleaning plate and a driving member for driving the support plate to reciprocate. The driving member is arranged on the recovery frame, and the cleaning plate is located between the support plate and the filter plate.

4. A waste heat recovery device for a thermal power station according to claim 3, characterized in that: The support plate is provided with an elastic pressing member for driving the cleaning plate to press against the filter plate.

5. The waste heat recovery device for a thermal power station according to claim 3, characterized in that: The recovery frame is provided with a guide member for limiting the deflection of the support plate. The guide member and the driving member are respectively located at both ends of the support plate. One end of the support plate is slidably connected to the guide member, so that under the drive of the driving member, the support plate can drive the cleaning plate to move back and forth stably.

6. The waste heat recovery device for a thermal power station according to claim 1, characterized in that: The bottom edge of the recycling frame window is tilted downward.

7. The waste heat recovery device for a thermal power station according to claim 1, characterized in that: A connector connected to the heat exchange tube is installed on the recovery frame, the connector is located outside the recovery frame, and a purifier is provided between the connector and the heat exchange tube.

8. The waste heat recovery device for a thermal power station according to claim 7, characterized in that: The purifier comprises a tank box which is connected and installed between the connector and the heat exchange tube, and a sieve plate which is arranged in the tank box and used for filtering impurities. The sieve plate is detachably installed in the tank box.

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