A heat supply device for waste heat recovery of a thermal power plant

Abstract

The utility model relates to the technical field of heat supply device, in particular to a kind of heat supply device for thermal power plant waste heat recovery, when using, water enters the inside of heat exchange box by inlet pipe, under the action of the pressure difference of high-temperature flue gas system and filter assembly, particle impurities are filtered out by filter assembly, after filtration, flue gas enters the inside of heat exchange tube, the flue gas in heat exchange tube carries out first heating to the water of heat exchange box inside, improve heating efficiency;Including circulating box, heat exchange box, heat exchange tube, inlet pipe and outlet pipe, the inside of circulating box is provided with heat exchange box, heat exchange tube is provided in heat exchange box, inlet pipe and outlet pipe are respectively provided on heat exchange box, inlet pipe and outlet pipe all extend to the outside of circulating box, further include: secondary heating assembly, it is installed in heat exchange box outside wall, for flue gas to the water in heat exchange box inside secondary heating;Filter assembly, it is installed in heat exchange tube input end, for filtering the particle impurities in flue gas.

Description

Technical Field

[0001] This utility model relates to the technical field of heating devices, and in particular to a heating device for waste heat recovery in thermal power plants. Background Technology

[0002] Thermal power plants, as one of the main facilities for electricity production, typically burn fuels such as coal, oil, and natural gas to generate high-temperature flue gas that drives steam turbines to generate electricity. During this process, the flue gas discharged from the boiler is at a high temperature; direct emission not only wastes a significant amount of heat energy but also causes thermal and dust pollution to the environment. Therefore, flue gas waste heat recovery technology has become an important way to improve energy utilization efficiency and achieve energy conservation and emission reduction.

[0003] Currently, some waste heat recovery devices achieve heat recovery by exchanging heat between flue gas and water or air. For example, Chinese utility model patent CN223331748U discloses a heating device for waste heat recovery in thermal power plants. This device uses an air pump to guide flue gas into a circulation box and utilizes structures such as a smoke distribution frame and a conversion box to perform multi-stage heat recovery from the flue gas, thereby heating the water in the conversion box and the circulating water in the transducer pipe, thus improving the heat utilization rate.

[0004] However, the aforementioned existing technologies still have significant shortcomings in practical applications: high-temperature flue gas often carries a large amount of particulate matter and unburned impurities. These impurities easily adhere to the inner walls when flowing through the energy exchanger pipes, conversion boxes, and smoke distribution structures, forming ash and scale. After long-term operation, this not only reduces the flue gas flow efficiency but also seriously affects the heat transfer performance of the heat exchange surfaces, leading to a significant decrease in waste heat recovery efficiency and even causing problems such as equipment blockage and frequent maintenance. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a heating device for waste heat recovery in thermal power plants.

[0006] This utility model discloses a heating device for waste heat recovery in thermal power plants, comprising a circulating tank, a heat exchange tank, heat exchange tubes, an inlet pipe, and an outlet pipe. The circulating tank houses the heat exchange tank, which in turn houses the heat exchange tubes. The inlet pipe and outlet pipe are respectively mounted on the heat exchange tank, both extending to the outside of the circulating tank. The device also includes: The secondary heating component is installed on the outer wall of the heat exchange box and is used to heat the water inside the heat exchange box by the flue gas. The filter assembly, installed at the inlet of the heat exchange tubes, is used to filter particulate impurities in the flue gas. During operation, water enters the heat exchange box through the inlet pipe. Under the pressure difference between the high-temperature flue gas system and the filter assembly, particulate impurities are removed. The filtered flue gas then enters the heat exchange tubes, where it heats the water inside the heat exchange box for the first time. Subsequently, the flue gas enters the secondary heating assembly through the heat exchange tubes to heat the outer wall of the heat exchange box, achieving two heating cycles for the water inside the heat exchange box. This improves heat utilization. The filter assembly also prevents particulate impurities in the flue gas from adhering to the inside of the heat exchange tubes, thus improving heat transfer and heating efficiency.

[0007] Preferably, the secondary heating assembly includes a jacket, an exhaust pipe, a gas supply pipe, an annular pipe, a support, and a gas delivery pipe. The jacket is fixedly fitted onto the outer wall of the heat exchange box; the exhaust pipe is fixedly installed at the top of the jacket; the gas supply pipe is located at the output end of the heat exchange tube; the support is fixedly installed on the outer wall of the heat exchange box; the annular pipe is fixedly mounted on multiple sets of supports; multiple sets of gas delivery pipes are fixedly installed between the heat exchange box and the annular pipe; wherein, the output end of the gas supply pipe is connected to the input end of the annular pipe; in use, flue gas enters the heat exchange tube to heat the water inside the heat exchange box for the first time, and then the flue gas enters the annular pipe through the gas supply pipe, and the flue gas entering the annular pipe enters the jacket through multiple sets of gas delivery pipes, and the flue gas entering the jacket heats the outside of the heat exchange box for the second time, realizing dual heating of the water inside the heat exchange box from both inside and outside, and then the flue gas inside the jacket is discharged through the exhaust pipe, improving heating efficiency.

[0008] Preferably, the filter assembly includes an inlet pipe, a first tee pipe, a delivery pipe, a delivery valve, a second tee pipe, and a filter box assembly. The output end of the inlet pipe is connected to the input end of the first tee pipe. The input ends of the two sets of delivery pipes are respectively connected to the two output ends of the first tee pipe. Each set of delivery pipes is equipped with two sets of delivery valves. The output ends of the two sets of delivery pipes are respectively connected to the two input ends of the second tee pipe, and the output end of the second tee pipe is connected to the input end of the heat exchange tube. Each set of delivery pipes is equipped with a filter box assembly, which is located between the two sets of delivery valves. Open the two sets of conveying valves on the first set of conveying pipes and close the two sets of conveying valves on the second set of conveying pipes to make the first set of filter box assemblies work, while the second set of filter box assemblies is in standby mode. Flue gas enters the first set of filter box assemblies through the inlet pipe and the first set of conveying pipes for particulate filtration to prevent particles from entering the heat exchange tubes. After a period of use, open the two sets of conveying valves on the second set of conveying pipes and close the two sets of conveying valves on the first set of conveying pipes to complete the switching between the two sets of filter box assemblies. The staff cleans and maintains the first set of filter box assemblies to achieve continuous heating.

[0009] Preferably, the filter box assembly includes a filter box body, a cover, and bolts. The filter box body is fixedly installed on the conveying pipe, and a filter element is installed inside the filter box body. The cover is fixedly installed on the top of the filter box body by bolts. Flue gas and particulate impurities enter the filter box body through the inlet pipe and the conveying pipe. The filter element filters the particulate impurities in the flue gas. After a period of use, the cover is opened, the filter element is removed, and the filtered particulate impurities are cleaned, improving convenience.

[0010] Preferably, a pressure gauge is installed on the heat exchange tube; the operator can use the pressure gauge to determine whether the filter element needs to be cleaned, thus improving convenience.

[0011] Preferably, the lid also includes a handle, with a handle provided at the top of the lid; the staff can move the lid with the help of the handle, improving convenience.

[0012] Preferably, the filter element is made of a high-temperature resistant porous material.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: In use, water enters the heat exchange box through the water inlet pipe. Under the action of the pressure difference between the high-temperature flue gas system and the filter component, particulate impurities are filtered out by the filter component. The filtered flue gas enters the heat exchange tube. The flue gas inside the heat exchange tube heats the water inside the heat exchange box for the first time. Then, the flue gas enters the secondary heating component from the heat exchange tube to heat the outer wall of the heat exchange box, realizing the two-time heating of the water inside the heat exchange box, improving the heat utilization rate. The filter component prevents particulate impurities in the flue gas from adhering to the inner side of the heat exchange tube, improving the heat transfer efficiency and heating efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the isometric structure of this utility model; Figure 2 This is an exploded structural diagram of the present invention; Figure 3 It is an enlarged structural diagram of the heat exchange box and jacket, etc. Figure 4 This is an enlarged structural diagram of the heat exchange tube and the No. 1 tee tube, etc. Figure 5 yes Figure 4 A magnified schematic diagram of part A in the middle.

[0015] The following are labels in the attached diagram: 1. Circulation box; 2. Heat exchange box; 3. Heat exchange tube; 4. Water inlet pipe; 5. Jacket; 6. Exhaust pipe; 7. Gas supply pipe; 8. Circular pipe; 9. Support; 10. Gas delivery pipe; 11. Air inlet pipe; 12. No. 1 tee pipe; 13. Delivery pipe; 14. Delivery valve; 15. No. 2 tee pipe; 16. Filter box body; 17. Box cover; 18. Bolt; 20. Handle; 21. Water outlet pipe. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0017] Example 1 like Figures 1 to 5 As shown, this utility model discloses a heating device for waste heat recovery in thermal power plants, comprising a circulation tank 1, a heat exchange tank 2, heat exchange tubes 3, an inlet pipe 4, and an outlet pipe 21. The circulation tank 1 houses the heat exchange tank 2, which in turn houses the heat exchange tubes 3. The inlet pipe 4 and outlet pipe 21 are respectively installed on the heat exchange tank 2, both extending to the outside of the circulation tank 1. The device also includes: The secondary heating component is installed on the outer wall of the heat exchange box 2 and is used for secondary heating of the water inside the heat exchange box 2 by the flue gas. The filter assembly, installed at the inlet of heat exchange tube 3, is used to filter particulate impurities in the flue gas. like Figure 2 and Figure 3 As shown, the secondary heating assembly includes a jacket 5, an exhaust pipe 6, a gas supply pipe 7, an annular pipe 8, a support 9, and a gas delivery pipe 10. The jacket 5 is fixedly fitted onto the outer wall of the heat exchange box 2; the exhaust pipe 6 is fixedly installed at the top of the jacket 5; the gas supply pipe 7 is located at the output end of the heat exchange tube 3; the support 9 is fixedly installed on the outer wall of the heat exchange box 2; the annular pipe 8 is fixedly mounted on multiple sets of supports 9; multiple sets of gas delivery pipes 10 are fixedly installed between the heat exchange box 2 and the annular pipe 8; wherein, the output end of the gas supply pipe 7 is connected to the input end of the annular pipe 8. The filtration assembly includes an air inlet pipe 11, a first tee pipe 12, a delivery pipe 13, a delivery valve 14, a second tee pipe 15, and a filter box assembly. The output end of the air inlet pipe 11 is connected to the input end of the first tee pipe 12. The two sets of delivery pipes 13 are respectively connected to the two sets of output ends of the first tee pipe 12. Each set of delivery pipes 13 is equipped with two sets of delivery valves 14. The output ends of the two sets of delivery pipes 13 are respectively connected to the two sets of input ends of the second tee pipe 15, and the output end of the second tee pipe 15 is connected to the input end of the heat exchange tube 3. Each set of delivery pipes 13 is equipped with a filter box assembly, which is located between the two sets of delivery valves 14.

[0018] In this embodiment, the two sets of conveying valves 14 on the first set of conveying pipes 13 are opened and the two sets of conveying valves 14 on the second set of conveying pipes 13 are closed, thereby enabling the first set of filter box assemblies to operate while the second set of filter box assemblies remains in standby mode. Flue gas enters the first set of filter box assemblies through the inlet pipe 11 and the first set of conveying pipes 13 for particle filtration, preventing particles from entering the heat exchange tube 3. After a period of use, the two sets of conveying valves 14 on the second set of conveying pipes 13 are opened and the two sets of conveying valves 14 on the first set of conveying pipes 13 are closed, completing the switching of the two sets of filter box assemblies. In the next step, the staff cleans and maintains the first set of filter box components to achieve continuous heating. After filtration, the flue gas enters the heat exchange tube 3 to heat the water inside the heat exchange box 2. Then, the flue gas enters the annular pipe 8 through the gas supply pipe 7. The flue gas entering the annular pipe 8 enters the jacket 5 through multiple sets of gas supply pipes 10. The flue gas entering the jacket 5 heats the outside of the heat exchange box 2 a second time, achieving dual heating of the water inside the heat exchange box 2 from both the inside and outside. Afterward, the flue gas inside the jacket 5 is discharged through the exhaust pipe 6, improving heating efficiency.

[0019] Example 2 like Figures 1 to 5 As shown, this utility model discloses a heating device for waste heat recovery in thermal power plants, comprising a circulation tank 1, a heat exchange tank 2, heat exchange tubes 3, an inlet pipe 4, and an outlet pipe 21. The circulation tank 1 houses the heat exchange tank 2, which in turn houses the heat exchange tubes 3. The inlet pipe 4 and outlet pipe 21 are respectively installed on the heat exchange tank 2, both extending to the outside of the circulation tank 1. The device also includes: The secondary heating component is installed on the outer wall of the heat exchange box 2 and is used for secondary heating of the water inside the heat exchange box 2 by the flue gas. The filter assembly, installed at the inlet of heat exchange tube 3, is used to filter particulate impurities in the flue gas. like Figure 2 and Figure 3As shown, the secondary heating assembly includes a jacket 5, an exhaust pipe 6, a gas supply pipe 7, an annular pipe 8, a support 9, and a gas delivery pipe 10. The jacket 5 is fixedly fitted onto the outer wall of the heat exchange box 2; the exhaust pipe 6 is fixedly installed at the top of the jacket 5; the gas supply pipe 7 is located at the output end of the heat exchange tube 3; the support 9 is fixedly installed on the outer wall of the heat exchange box 2; the annular pipe 8 is fixedly mounted on multiple sets of supports 9; multiple sets of gas delivery pipes 10 are fixedly installed between the heat exchange box 2 and the annular pipe 8; wherein, the output end of the gas supply pipe 7 is connected to the input end of the annular pipe 8. The filtration assembly includes an inlet pipe 11, a first tee pipe 12, a delivery pipe 13, a delivery valve 14, a second tee pipe 15, and a filter box assembly. The output end of the inlet pipe 11 is connected to the input end of the first tee pipe 12. The two sets of delivery pipes 13 are respectively connected to the two sets of output ends of the first tee pipe 12. Each set of delivery pipes 13 is equipped with two sets of delivery valves 14. The output ends of the two sets of delivery pipes 13 are respectively connected to the two sets of input ends of the second tee pipe 15, and the output end of the second tee pipe 15 is connected to the input end of the heat exchange tube 3. Each set of delivery pipes 13 is equipped with a filter box assembly, which is located between the two sets of delivery valves 14. like Figure 5 As shown, the filter box assembly includes a filter box body 16, a box cover 17, and bolts 18. The filter box body 16 is fixedly installed on the conveying pipe 13. A filter element is provided inside the filter box body 16. The box cover 17 is fixedly installed on the top of the filter box body 16 by bolts 18. The heat exchange tube 3 is equipped with a pressure gauge, which is not shown in the diagram. It also includes a handle 20, which is provided at the top of the box cover 17; The filter element is made of high-temperature resistant porous materials, such as sintered metal materials, porous ceramics, or ceramic fiber materials.

[0020] In this embodiment, the two sets of conveying valves 14 on the first set of conveying pipes 13 are opened and the two sets of conveying valves 14 on the second set of conveying pipes 13 are closed, thereby enabling the first set of filter box assemblies to operate while the second set of filter box assemblies remains in standby mode. Flue gas enters the first set of filter box assemblies through the inlet pipe 11 and the first set of conveying pipes 13 for particle filtration, preventing particles from entering the heat exchange tube 3. After a period of use, the two sets of conveying valves 14 on the second set of conveying pipes 13 are opened and the two sets of conveying valves 14 on the first set of conveying pipes 13 are closed, completing the switching between the two sets of filter box assemblies. The operator then cleans and maintains the first set of filter box assemblies to achieve continuous heating. After filtration, the flue gas... The flue gas enters the heat exchange tube 3 to heat the water inside the heat exchange box 2. Then, the flue gas enters the annular pipe 8 through the gas supply pipe 7. The flue gas entering the annular pipe 8 enters the jacket 5 through multiple sets of gas supply pipes 10. The flue gas entering the jacket 5 heats the outside of the heat exchange box 2 a second time, achieving dual heating of the water inside the heat exchange box 2 from both the inside and outside. After that, the flue gas inside the jacket 5 is discharged through the exhaust pipe 6. The flue gas and particulate impurities enter the filter box body 16 through the inlet pipe 11 and the delivery pipe 13. The filter element filters the particulate impurities in the flue gas. After a period of use, the box cover 17 is opened, the filter element is removed, and the filtered particulate impurities are cleaned.

[0021] The filter element and pressure gauge of the heating device for waste heat recovery in thermal power plants of this utility model are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A heating device for waste heat recovery in a thermal power plant, comprising a circulating tank (1), a heat exchange box (2), heat exchange tubes (3), an inlet pipe (4), and an outlet pipe (21), wherein the circulating tank (1) contains the heat exchange box (2), the heat exchange box (2) contains the heat exchange tubes (3), and the heat exchange box (2) is provided with the inlet pipe (4) and the outlet pipe (21), both extending to the outside of the circulating tank (1), characterized in that, Also includes: The secondary heating component is installed on the outer wall of the heat exchange box (2) and is used to heat the water inside the heat exchange box (2) with flue gas. The filter assembly is installed at the inlet of the heat exchange tube (3) and is used to filter particulate impurities in the flue gas.

2. A heating device for waste heat recovery in thermal power plants as described in claim 1, characterized in that, The secondary heating component includes: The jacket (5) is fixedly fitted onto the outer wall of the heat exchange box (2); The exhaust pipe (6) is fixedly installed at the top of the sleeve (5); Gas delivery pipe (7) is installed at the output end of heat exchange tube (3); The bracket (9) is fixedly installed on the outer wall of the heat exchange box (2); The annular pipe (8) is fixed on multiple sets of supports (9); Multiple sets of air supply pipes (10) are fixedly installed between the heat exchange box (2) and the annular pipe (8); The output end of the gas delivery pipe (7) is connected to the input end of the annular pipe (8).

3. A heating device for waste heat recovery in thermal power plants as described in claim 1, characterized in that, The filtering component includes: Intake pipe (11); The No. 1 three-way pipe (12) is connected to the input end of the No. 1 three-way pipe (12) at the output end of the air inlet pipe (11); Two sets of delivery pipes (13) are respectively connected to the two output ends of the No. 1 three-way pipe (12); Two sets of delivery valves (14) are installed on each set of delivery pipes (13); The output ends of the two sets of conveying pipes (13) are connected to the two sets of input ends of the two sets of the two sets of the two sets of the two sets of the two sets of the two sets of the three ... two sets of the two sets of the two sets of the two sets of the Each set of conveying pipes (13) is equipped with a set of filter box assemblies, which are located between two sets of conveying valves (14).

4. A heating device for waste heat recovery in thermal power plants as described in claim 3, characterized in that, The filter box assembly includes: The filter box body (16) is fixedly installed on the conveying pipe (13), and the filter box body (16) is provided with filter elements. Box cover (17); the cover is fixed to the top of the filter box body (16) by bolts (18).

5. A heating device for waste heat recovery in thermal power plants as described in claim 1, characterized in that, A pressure gauge is installed on the heat exchange tube (3).

6. A heating device for waste heat recovery in thermal power plants as described in claim 4, characterized in that, It also includes a handle (20), which is provided at the top of the lid (17).

7. A heating device for waste heat recovery in thermal power plants as described in claim 4, characterized in that, The filter element is made of a high-temperature resistant porous material.

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