Industrial waste heat recycling heat supply device

Abstract

The invention relates to an industrial waste heat recycling heat supply device which comprises an energy storage type heat exchanger, a high-temperature heat pump and a heat exchanger, and the energy storage type heat exchanger is located on one side of the high-temperature heat pump. When the preheating temperature is low, waste heat directly enters the heat exchanger to serve as a low-temperature heat source of the high-temperature heat pump and exchanges heat with a medium in the energy storage type heat exchanger through the corrugated pipe heat exchanger, and heat in low-temperature hot water is further extracted through the high-temperature heat pump after the temperature of the industrial waste heat is reduced after heat release. The temperature of the low-temperature hot water is reduced to the return water temperature required by the production process (the low-temperature warm water can be reduced to 5 DEG C to be discharged when the process production waste heat water is not recycled by a system), the medium medium of the energy storage type heat exchanger is converted into high-quality heat energy, and the heat energy can be used for heat supply, domestic hot water heating, a low-temperature heat source of an absorption refrigerator and other places; according to the device, low-grade industrial waste heat is processed into high-grade heat energy, the low-grade heat energy can be fully utilized, and waste is turned into wealth.

Description

Technical Field

[0001] The invention relates to the field of industrial heat energy recovery, and in particular to an industrial waste heat recovery and utilization heating device. Background Art

[0002] At present, industrial enterprises such as steel, cement, building gypsum, and food generally generate a large amount of industrial waste heat in the production process. These industrial waste heat contains a large amount of thermal energy. However, if this part of the heat energy is not reasonably utilized and directly discharged into the atmosphere, it will not only cause energy waste and economic losses. In September 2020, China clearly put forward the goals of "carbon peak" in 2030 and "carbon neutrality" in 2060.

[0003] Energy conservation, emission reduction and consumption reduction have become the main tasks of industrial enterprises. At present, factories emit a large amount of waste heat every day, such as heat from condensers in power plants and various cooling towers. How to utilize this low-grade heat energy has become a difficult issue. At present, a large amount of waste heat generated by industry is directly discharged into the environment, which not only causes a large amount of heat energy waste, but also causes greenhouse effect pollution to the environment. Therefore, there is an urgent need for an industrial waste heat recovery and utilization heating device that can make full use of low-grade heat energy and turn waste into treasure to benefit the country and the people. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides an industrial waste heat recovery and heating device

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] An industrial waste heat recovery and heating device comprises an energy storage heat exchanger, a high-temperature heat pump and a heat exchanger, wherein the energy storage heat exchanger is located on one side of the high-temperature heat pump, and the high-temperature heat pump is located on one side of the heat exchanger. A user's hot water low-temperature return pipe is fixedly connected to one side of the energy storage heat exchanger, and a user's hot water high-temperature water supply pipe is fixedly connected to the other side of the energy storage heat exchanger. A fourth interconnecting pipe is fixedly connected to one side of the high-temperature heat pump, and one side of the energy storage heat exchanger is connected through the fourth interconnecting pipe, and one end of the fourth interconnecting pipe is fixedly connected to the high-temperature heat pump. An industrial waste heat low-temperature return pipe is fixedly connected to one side of the heat exchanger, a fifth interconnecting pipe is fixedly connected to one side of the energy storage heat exchanger, and one end of the fifth interconnecting pipe is fixedly connected to the high-temperature heat pump. An industrial waste heat high-temperature water inlet pipe is fixedly connected to one side of the heat exchanger, a second interconnecting pipe is fixedly connected to one side of the energy storage heat exchanger, and a third interconnecting pipe is fixedly connected to one side of the energy storage heat exchanger.

[0007] Preferably, a lower low-temperature zone is provided at the bottom end of the inner wall of the energy storage heat exchanger, an upper high-temperature zone is provided at the top end of the inner wall of the energy storage heat exchanger, and a bellows heat exchanger is fixedly connected inside the energy storage heat exchanger.

[0008] Preferably, a first partition is fixedly connected to one side of the inner wall of the energy storage heat exchanger, a second partition is fixedly connected to the other side of the inner wall of the energy storage heat exchanger, and one end of the bellows heat exchanger is through-connected to the second connecting pipe.

[0009] Preferably, the other end of the bellows heat exchanger is connected to a third interconnecting pipe, the bottom end of the third interconnecting pipe is fixedly connected to a first interconnecting pipe, and the other end of the first interconnecting pipe is connected to an industrial waste heat low-temperature return pipe.

[0010] Preferably, a first stop valve is fixedly connected to the interior of the third interconnecting pipe, and a second stop valve is fixedly connected to the interior of the second interconnecting pipe.

[0011] Preferably, a fourth stop valve is fixedly connected to the interior of the first connecting pipe, and a third stop valve is fixedly connected to the interior of the industrial waste heat high-temperature water inlet pipe.

[0012] Preferably, a hot water storage pump is fixedly connected to the inner side of the fourth interconnecting pipe, a heat pump source side circulating water pump is fixedly connected to one side of the high-temperature heat pump, the output end of the heat pump source side circulating water pump is fixedly connected to the heat exchanger, and the user hot water high-temperature water supply pipe is fixedly connected to the hot water circulating water pump.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention firstly passes high-temperature waste heat into the energy storage heat exchanger, and exchanges heat with the medium in the energy storage heat exchanger through the bellows heat exchanger. After the industrial waste heat releases heat, the temperature is reduced (the waste steam condenses into low-temperature hot water), and then the heat in the low-temperature hot water is further extracted through the high-temperature heat pump, so that the temperature of the low-temperature hot water is reduced to the return water temperature required by the production process (when the hot water does not need to return to the process system, it is reduced to 5-10 degrees). At this time, the medium in the energy storage heat exchanger becomes high-quality thermal energy, which can be used for heating, heating domestic hot water, and low-temperature heat source of absorption refrigerators. This device processes low-grade industrial waste heat into high-grade thermal energy. Effectively utilizing low-grade thermal energy has become a difficult issue. This device can make full use of low-grade thermal energy and turn waste into treasure;

[0015] 2. By controlling the switches of the first stop valve, the second stop valve, the third stop valve and the fourth stop valve, the overall flow direction of industrial water is controlled, and the industrial water is returned to the industrial process system through the energy storage heat exchanger and the heat exchanger for heat exchange treatment. The user water enters the energy storage heat exchanger, and after the internal water supply is heated by the energy storage heat exchanger, it flows out through the user's hot water high-temperature water supply pipe for user use, so that industrial water and user water can be isolated and circulated independently. The heat of the industrial water is transferred to the user's water through heat exchange and temperature treatment through the heat exchanger and heat pump. The heat recovery equipment can be adjusted accordingly according to different needs to enhance the effect of the equipment on industrial hot water heat energy recovery, which not only saves energy and reduces emissions, but also can make timely adjustments according to the corresponding industrial water conditions to enhance the versatility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall system connection of the present invention.

[0017] Figure 2 It is a schematic diagram of the connection structure of the energy storage heat exchanger of the present invention.

[0018] Figure 3 The present invention Figure 2 Schematic diagram of the structure at point A.

[0019] Figure 1-3 In: 1. Energy storage heat exchanger; 2. High-temperature heat pump; 3. Heat exchanger; 4. User hot water low-temperature return pipe; 5. User hot water high-temperature supply pipe; 6. Industrial waste heat low-temperature return pipe; 7. Industrial waste heat high-temperature inlet pipe; 8. Upper high-temperature zone; 9. Lower low-temperature zone; 10. Bellows heat exchanger; 11. First connecting pipe; 12. First partition; 13. Second partition; 14. Second connecting pipe; 15. Third connecting pipe; 16. First stop valve; 17. Second stop valve; 18. Third stop valve; 19. Fourth stop valve; 20. Fourth connecting pipe; 21. Fifth connecting pipe; 22. Circulating water pump on the source side of the heat pump; 23. Hot water circulating water pump; 24. Hot water storage water pump. DETAILED DESCRIPTION

[0020] Embodiment 1: Figure 1-3An industrial waste heat recovery and heating device shown in the figure includes an energy storage heat exchanger 1, a high-temperature heat pump 2 and a heat exchanger 3. The energy storage heat exchanger 1 is located on one side of the high-temperature heat pump 2, and the high-temperature heat pump 2 is located on one side of the heat exchanger 3. A user's hot water low-temperature return pipe 4 is fixedly connected to one side of the energy storage heat exchanger 1, and a user's hot water high-temperature supply pipe 5 is fixedly connected to the other side of the energy storage heat exchanger 1. A fourth interconnecting pipe 20 is fixedly connected to one side of the high-temperature heat pump 2. One side of the energy storage heat exchanger 1 is connected through the fourth interconnecting pipe 20, and one end of the fourth interconnecting pipe 20 is fixedly connected to the high-temperature heat pump 2. An industrial waste heat low-temperature return pipe 6 is fixedly connected to one side of the heat exchanger 3. A fifth interconnecting pipe 21 is fixedly connected to one side of the energy storage heat exchanger 1, one end of which is fixedly connected to the high-temperature heat pump 2. An industrial waste heat high-temperature water inlet pipe 7 is fixedly connected to one side of the heat exchanger 3. A second interconnecting pipe 14 is fixedly connected to one side of the energy storage heat exchanger 1. A third interconnecting pipe 15 is fixedly connected to one side of the energy storage heat exchanger 1. High-temperature waste heat first enters the energy storage heat exchanger 1, and exchanges heat with the medium in the energy storage heat exchanger 1 through the bellows heat exchanger 10. After the industrial waste heat releases, the temperature is reduced (the waste steam condenses into low-temperature hot water), and then the heat in the low-temperature hot water is further extracted through the high-temperature heat pump 2, so that the temperature of the low-temperature hot water is reduced to the temperature required by the production process. The return water temperature (when hot water does not need to return to the process system, it drops to 5-10 degrees), at this time, the medium in the energy storage heat exchanger 1 becomes high-quality thermal energy, which can be used for heating, heating domestic hot water, low-temperature heat source of absorption refrigerators, etc. This device processes low-grade industrial waste heat into high-grade thermal energy. When in use, according to the different industrial waste heat temperatures, by controlling the switches of the first stop valve 16, the second stop valve 17, the third stop valve 18 and the fourth stop valve 19, the hot water generated by industrial production flows in the corresponding direction. By opening the first stop valve 16 and the second stop valve 17, the hot water generated by industrial production at this time passes through the industrial waste heat high-temperature water inlet pipe 7 and the second connecting pipe 14 through the bellows heat exchanger 10 enters the third interconnecting pipe 15 for reflux, and then passes through the heat exchanger 3 and the industrial waste heat low-temperature return pipe 6 for reflux to the industrial equipment for recycling. The high-temperature heat pump 2 uses the heat exchanger 3 as a low-temperature heat source to produce high-temperature hot water, which enters the energy storage heat exchanger 1 for internal storage, and the user's hot water is supplied to the user after being pressurized by the hot water circulation pump 23 from the high-temperature zone of the energy storage heat exchanger 1 and the user's hot water high-temperature water supply pipe 5. The user's return water flows from the user's hot water low-temperature return pipe 4 to the low-temperature zone of the energy storage heat exchanger 1. This solution can convert low-grade thermal energy in industrial water into high-grade thermal energy and store it in the energy storage heat exchanger 1, thereby improving heat exchange efficiency, improving the quality of user heat sources, meeting the needs of heat users, and enhancing the secondary utilization of heat from industrial water.

[0021] Embodiment 2: Figure 1-3The bottom end of the inner wall of the energy storage heat exchanger 1 is provided with a lower low temperature zone 9, the top end of the inner wall of the energy storage heat exchanger 1 is provided with an upper high temperature zone 8, the interior of the energy storage heat exchanger 1 is fixedly connected with a bellows heat exchanger 10, one side of the inner wall of the energy storage heat exchanger 1 is fixedly connected with a first baffle 12, and the other side of the inner wall of the energy storage heat exchanger 1 is fixedly connected with a second baffle 13, one end of the bellows heat exchanger 10 is connected with a second connecting pipe 14, and the other end of the bellows heat exchanger 10 is connected with a third connecting pipe 15. The bottom end of the third interconnecting pipe 15 is fixedly connected to the first interconnecting pipe 11, the other end of the first interconnecting pipe 11 is connected to the industrial waste heat low-temperature return pipe 6, the interior of the third interconnecting pipe 15 is fixedly connected to the first stop valve 16, the interior of the second interconnecting pipe 14 is fixedly connected to the second stop valve 17, the interior of the first interconnecting pipe 11 is fixedly connected to the fourth stop valve 19, the interior of the industrial waste heat high-temperature inlet pipe 7 is fixedly connected to the third stop valve 18, and the inner side of the fourth interconnecting pipe 20 is fixedly connected to the hot water storage pump 24 A heat pump source side circulating water pump 22 is fixedly connected to one side of the high-temperature heat pump 2, and the output end of the heat pump source side circulating water pump 22 is fixedly connected to the heat exchanger 3. The user's hot water high-temperature water supply pipe 5 is fixedly connected to the hot water circulating water pump 23. When in use, by opening the second stop valve 17 and the fourth stop valve 19, the hot water generated by industrial production enters the bellows heat exchanger 10 through the industrial waste heat high-temperature water inlet pipe 7 for heat exchange, and the cooled industrial water flows to the third interconnecting pipe 15, and then enters the industrial waste heat low-temperature return water pipe 6 through the first interconnecting pipe 11 to flow back to the industrial equipment for continued circulation, and the user's hot water return water enters the low-temperature zone inside the energy storage heat exchanger 1. The high-temperature hot water in the high-temperature zone inside the energy storage heat exchanger 1 is supplied to the user through the hot water circulating water pump 23. In this scheme, industrial water and user water are isolated and circulated independently, and the heat of the industrial water is transferred to the user's water through the bellows heat exchanger 10 for heat exchange treatment. In this scheme, industry and users are independently circulated, which is suitable for situations where the temperature of industrial waste water is high.

[0022] In summary, the present invention has the following working principle: high-temperature waste heat first enters the energy storage heat exchanger 1, and exchanges heat with the medium in the energy storage heat exchanger 1 through the bellows heat exchanger 10. After the industrial waste heat releases, the temperature is reduced (the waste steam condenses into low-temperature hot water), and then the heat in the low-temperature hot water is further extracted through the high-temperature heat pump 2, so that the temperature of the low-temperature hot water is reduced to the return water temperature required by the production process (when the hot water does not need to return to the process system, it is reduced to 5-10 degrees). At this time, the medium in the energy storage heat exchanger 1 becomes high-quality thermal energy, which can be used for heating, heating domestic hot water, and low-temperature heat source of absorption refrigerators. The device processes low-grade industrial waste heat into high-grade thermal energy. By controlling the switches of the first stop valve 16, the second stop valve 17, the third stop valve 18 and the fourth stop valve 19, the hot water generated by industrial production flows in the corresponding direction. By opening the first stop valve 16, the second stop valve 17, the third stop valve 18 and the fourth stop valve 19, the hot water generated by industrial production flows in the corresponding direction. When the stop valve 16 and the second stop valve 17 are closed, the hot water generated by industrial production at this time passes through the industrial waste heat high-temperature water inlet pipe 7, the second connecting pipe 14, and the bellows heat exchanger 10 into the third connecting pipe 15 for reflux, and then passes through the heat exchanger 3 and the industrial waste heat low-temperature return pipe 6 for reflux to the industrial equipment for recycling. The high-temperature heat pump 2 uses the heat exchanger 3 as a low-temperature heat source to produce high-temperature hot water and enters the energy storage heat exchanger 1 for internal storage, while the user's hot water is supplied to the user after being pressurized by the high-temperature zone of the energy storage heat exchanger 1 and the user's hot water high-temperature water supply pipe 5 through the hot water circulation pump 23. The user's return water flows from the user's hot water low-temperature return pipe 4 to the low-temperature zone of the energy storage heat exchanger 1. This scheme can convert low-grade thermal energy in industrial water into high-grade thermal energy and store it in the energy storage heat exchanger 1, thereby improving heat exchange efficiency, improving the quality of user heat sources, meeting the needs of heat users, and enhancing the secondary utilization of industrial water heat. At the same time, by opening the second stop valve 17 and the fourth stop valve 19, the hot water produced by industrial production enters the bellows heat exchanger 10 through the industrial waste heat high-temperature water inlet pipe 7 for heat exchange, and the cooled industrial water flows to the inner wall of the third interconnecting pipe 15, and then enters the industrial waste heat low-temperature return pipe 6 through the first interconnecting pipe 11 to flow back to the industrial equipment for continued circulation, and the user's hot water return water enters the low-temperature zone inside the energy storage heat exchanger 1, and the high-temperature hot water in the high-temperature zone inside the energy storage heat exchanger 1 is supplied to the user through the hot water circulation pump 23. In this scheme, industrial water and user water are isolated and circulated independently, and the heat of industrial water is transferred to the user water through the bellows heat exchanger 10 for heat exchange treatment. In this scheme, industry and users are independently circulated, which is suitable for the situation when the temperature of industrial waste water is high. The heat recovery equipment can be adjusted according to different needs to enhance the effect of the equipment on the recovery of industrial hot water heat energy, which not only saves energy and reduces emissions, but also can be adjusted in time according to the corresponding industrial water conditions to enhance the versatility of the equipment.

Claims

1. An industrial waste heat recovery and heating device, comprising an energy storage heat exchanger (1), a high-temperature heat pump (2) and a heat exchanger (3), characterized in that: The energy storage heat exchanger (1) is located on one side of the high-temperature heat pump (2), and the high-temperature heat pump (2) is located on one side of the heat exchanger (3). One side of the energy storage heat exchanger (1) is fixedly connected to a user's hot water low-temperature return pipe (4), and the other side of the energy storage heat exchanger (1) is fixedly connected to a user's hot water high-temperature supply pipe (5). One side of the high-temperature heat pump (2) is fixedly connected to a fourth interconnecting pipe (20), one side of the energy storage heat exchanger (1) is in continuous communication with the fourth interconnecting pipe (20), and one end of the fourth interconnecting pipe (20) is connected to the high-temperature heat pump (2). The heat pump (2) is fixedly connected, one side of the heat exchanger (3) is fixedly connected to an industrial waste heat low-temperature return pipe (6), one side of the energy storage heat exchanger (1) is fixedly connected to a fifth interconnecting pipe (21), one end of the fifth interconnecting pipe (21) is fixedly connected to the high-temperature heat pump (2), one side of the heat exchanger (3) is fixedly connected to an industrial waste heat high-temperature inlet pipe (7), one side of the energy storage heat exchanger (1) is fixedly connected to a second interconnecting pipe (14), and one side of the energy storage heat exchanger (1) is fixedly connected to a third interconnecting pipe (15).

2. The industrial waste heat recovery and heating device according to claim 1 is characterized in that: The bottom end of the inner wall of the energy storage heat exchanger (1) is provided with a lower low-temperature zone (9), the top end of the inner wall of the energy storage heat exchanger (1) is provided with an upper high-temperature zone (8), and a bellows heat exchanger (10) is fixedly connected inside the energy storage heat exchanger (1).

3. The industrial waste heat recovery and heating device according to claim 2 is characterized in that: A first partition (12) is fixedly connected to one side of the inner wall of the energy storage heat exchanger (1), and a second partition (13) is fixedly connected to the other side of the inner wall of the energy storage heat exchanger (1). One end of the bellows heat exchanger (10) is connected to a second connecting pipe (14). The inner side of the first partition (12) is set as a low-temperature end, and the inner side of the second partition (13) is set as a high-temperature end.

4. The industrial waste heat recovery and heating device according to claim 3 is characterized in that: The other end of the bellows heat exchanger (10) is connected to the third interconnecting pipe (15), the bottom end of the third interconnecting pipe (15) is fixedly connected to the first interconnecting pipe (11), and the other end of the first interconnecting pipe (11) is connected to the industrial waste heat low-temperature return pipe (6).

5. The industrial waste heat recovery and heating device according to claim 4 is characterized in that: The interior of the third connecting pipe (15) is fixedly connected to a first stop valve (16), and the interior of the second connecting pipe (14) is fixedly connected to a second stop valve (17).

6. The industrial waste heat recovery and heating device according to claim 5 is characterized in that: A fourth stop valve (19) is fixedly connected to the interior of the first connecting pipe (11), and a third stop valve (18) is fixedly connected to the interior of the industrial waste heat high-temperature water inlet pipe (7).

7. The industrial waste heat recovery and heating device according to claim 6 is characterized in that: A hot water storage pump (24) is fixedly connected to the inner side of the fourth interconnecting pipe (20), a heat pump source side circulating water pump (22) is fixedly connected to one side of the high-temperature heat pump (2), an output end of the heat pump source side circulating water pump (22) is fixedly connected to the heat exchanger (3), and the user hot water high-temperature water supply pipe (5) is fixedly connected to the hot water circulating water pump (23).

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