Waste heat recovery system

Abstract

The utility model provides a waste heat recovery system. The waste heat recovery system comprises a heat exchange device, a heat pump device, an energy storage device and a water supplementing device. A first air inlet and a first air outlet are formed in the first end of the heat exchange device; to-be-recycled waste heat gas enters the heat exchange device from a first gas inlet in the first end of the heat exchange device, and is discharged from a first gas outlet after internal circulation of the heat exchange device; the second end of the heat exchange device is connected with the heat pump device; the heat pump device comprises a low-temperature heat pump and a high-temperature heat pump which are connected in series, the first end of the low-temperature heat pump is connected with the second end of the heat exchange device, the second end of the low-temperature heat pump is connected with the first end of the high-temperature heat pump, and the second end of the high-temperature heat pump is connected with the energy storage device. The water supplementing device is connected with the heat pump device and the energy storage device and supplements water into the heat pump device and the heat exchange device. According to the utility model, the waste heat of the gas is recovered and utilized to heat the energy storage water for subsequent steps, so that the maximum utilization of the waste heat is achieved, and the energy-saving effect is remarkable.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to waste heat recycling technical field, especially a waste heat recovery system. BACKGROUND

[0002] With the aggravation of global energy crisis and the improvement of environmental protection consciousness, energy saving and emission reduction has become an important goal of development of each country.

[0003] The existing refrigeration machine system runs all the year round, produces a large amount of low-grade heat, is cooled by evaporation, and a large amount of hot water is needed in some process operations (such as packaging and brewing). Therefore, the recovered gas heat needs to be improved by heat pump technology for heating of energy storage water, which reduces steam consumption on the one hand and reduces the power consumption and water consumption of evaporation cooling on the other hand. In the prior art, the traditional heat pump system often has the problem of energy loss in the energy conversion and utilization process, resulting in low energy efficiency of the overall system. Therefore, how to efficiently recover waste heat to form a closed-loop high-efficiency energy utilization system is still a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the utility model provides a waste heat recovery system to solve the problem that there is no efficient waste heat recovery system at present.

[0005] In order to solve the above technical problems, the utility model is realized as follows:

[0006] In the first aspect, the embodiment of the utility model provides a waste heat recovery system, which comprises:

[0007] The heat exchange device, the heat pump device, the energy storage device and the water replenishing device;

[0008] The first end of the heat exchange device is provided with a first air inlet and a first air outlet; the waste heat gas to be recovered enters the heat exchange device from the first air inlet of the first end of the heat exchange device, and is discharged from the first air outlet of the first end of the heat exchange device after circulating in the heat exchange device; the second end of the heat exchange device is connected with the heat pump device;

[0009] The heat pump device comprises a low-temperature heat pump and a high-temperature heat pump, the low-temperature heat pump and the high-temperature heat pump are connected in series, the first end of the low-temperature heat pump is connected with the second end of the heat exchange device, the second end of the low-temperature heat pump is connected with the first end of the high-temperature heat pump, and the second end of the high-temperature heat pump is connected with the energy storage device;

[0010] The water replenishing device is connected with the heat pump device and the energy storage device respectively, and replenishes water into the heat pump device and the heat exchange device.

[0011] Optionally, the heat exchange device includes a heat exchanger, a first pipe, and a second pipe; a first end of the first pipe is connected to the inlet of the waste heat gas to be recovered, and a second end of the first pipe is connected to the heat exchanger; a first end of the second pipe is connected to the outlet of the waste heat gas to be recovered, and a second end of the second pipe is connected to the heat exchanger; the waste heat gas to be recovered enters the heat exchanger through the first pipe, and after the heat exchanger exchanges heat with the waste heat gas to be recovered, it is discharged through the second pipe;

[0012] The heat exchanger is provided with a first outlet and a first inlet at its second end, and the first outlet and the first inlet are connected to the heat pump device.

[0013] Optionally, the heat exchanger is a plate heat exchanger.

[0014] Optionally, the heat pump device further includes: a third pipe, a fourth pipe, a fifth pipe, a sixth pipe, a first water pump group, and a second water pump group;

[0015] The first end of the third pipe is connected to the first outlet of the heat exchange device, and the second end of the third pipe is connected to the first end of the low-temperature heat pump; the first end of the fourth pipe is connected to the first inlet of the heat exchange device, and the second end of the fourth pipe is connected to the first end of the low-temperature heat pump.

[0016] The first end of the fifth pipe is connected to the second end of the low-temperature heat pump, and the second end of the fifth pipe is connected to the first end of the high-temperature heat pump; the first end of the sixth pipe is connected to the second end of the low-temperature heat pump, and the second end of the sixth pipe is connected to the first end of the high-temperature heat pump.

[0017] The first water pump set is installed on the fourth pipe; the second water pump set is installed on the fifth pipe.

[0018] Optionally, the low-temperature heat pump includes a first evaporator and a first condenser;

[0019] The first evaporator has a second water inlet and a second water outlet at its first end. The second water inlet is connected to the heat exchange device through the third pipe. The second water outlet is connected to the heat exchange device through the fourth pipe. The second end of the first evaporator is connected to the first end of the first condenser.

[0020] The second end of the first condenser is provided with a third water outlet and a third water inlet; the third water outlet is connected to the high-temperature heat pump through the fifth pipe; the third water inlet is connected to the high-temperature heat pump through the sixth pipe.

[0021] Optionally, the high-temperature heat pump includes a second evaporator and a second condenser;

[0022] The second evaporator has a fourth water inlet and a fourth water outlet at its first end. The fourth water inlet is connected to the low-temperature heat pump through the fifth pipe. The fourth water outlet is connected to the low-temperature heat pump through the sixth pipe. The second end of the second evaporator is connected to the first end of the second condenser.

[0023] The second condenser is provided with a fifth water outlet and a fifth water inlet at its second end; the fifth water outlet and the fifth water inlet are connected to the energy storage device.

[0024] Optionally, the energy storage device includes: a seventh pipeline, an eighth pipeline, a third water pump set, and an energy storage tank;

[0025] The first end of the seventh pipe is connected to the fifth outlet of the high-temperature heat pump, and the second end of the seventh pipe is connected to the first end of the energy storage tank.

[0026] The first end of the eighth pipe is connected to the fifth inlet of the high-temperature heat pump, and the second end of the eighth pipe is connected to the second end of the energy storage tank; wherein, the first end of the energy storage tank is positioned higher than the second end.

[0027] The third water pump set is installed on the eighth pipeline.

[0028] Optionally, the energy storage device further includes: a ninth pipeline, a pneumatic butterfly valve, and a temperature transmitter;

[0029] The ninth pipe is located between the seventh pipe and the eighth pipe; a pneumatic butterfly valve is installed on the ninth pipe;

[0030] The temperature transmitter is installed on the seventh pipeline at one end near the energy storage tank.

[0031] Optionally, the first and second pump groups are equipped with three sets of pumps, two of which are in use and one of which is a standby pump; the third pump group is equipped with two sets of pumps, one of which is in use and the other of which is a standby pump.

[0032] Optionally, the water replenishment device includes: a tenth pipe, an eleventh pipe, and an expansion tank;

[0033] The first end of the tenth pipe is connected to the expansion tank, and the second end of the tenth pipe is connected to the fourth pipe;

[0034] The first end of the eleventh pipe is connected to the expansion tank, and the second end of the eleventh pipe is connected to the fifth pipe.

[0035] In this invention, a heat exchange device, a heat pump device, an energy storage device, and a water replenishment device are provided. The heat exchange device has a first air inlet and a first air outlet at its first end. The waste heat gas to be recovered enters the heat exchange device through the first air inlet, circulates internally, and is discharged through the first air outlet. The second end of the heat exchange device is connected to the heat pump device, which includes a low-temperature heat pump and a high-temperature heat pump connected in series. The first end of the low-temperature heat pump is connected to the second end of the heat exchange device, the second end of the low-temperature heat pump is connected to the first end of the high-temperature heat pump, and the second end of the high-temperature heat pump is connected to the energy storage device. The water replenishment device is connected to both the heat pump device and the energy storage device to replenish water to both devices. This system recovers and utilizes the waste heat from the gas, heating the stored water for subsequent steps, maximizing waste heat utilization, achieving significant energy savings, and solving the problem of the lack of efficient waste heat recovery systems in existing systems. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a schematic diagram of the structure of a waste heat recovery device provided in an embodiment of this utility model. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0039] Please refer to Figure 1 This utility model provides a waste heat recovery system, including:

[0040] Heat exchanger 1, heat pump 2, energy storage 3, and water supply 4;

[0041] The first end of the heat exchange device 1 is provided with a first air inlet 11 and a first air outlet 12; the waste heat gas to be recovered enters the heat exchange device 1 from the first air inlet 11 at the first end of the heat exchange device 1, and after circulating inside the heat exchange device 1, it is discharged from the first air outlet 12 at the first end of the heat exchange device 1; the second end of the heat exchange device 1 is connected to the heat pump device 2.

[0042] In this embodiment of the invention, the waste heat gas to be recovered includes, but is not limited to, ammonia gas generated in the refrigeration workshop of a brewery, as well as waste heat to be recovered from other workshops such as dairy plants, beverage plants, food plants, bamboo product plants, and lithium battery industries.

[0043] In this embodiment of the present invention, optionally, the heat exchange device 1 includes a heat exchanger 13, a first pipe 14, and a second pipe 15; the first end of the first pipe 14 is connected to the inlet of the waste heat gas to be recovered, and the second end of the first pipe 14 is connected to the heat exchanger 13; the first end of the second pipe 15 is connected to the outlet of the waste heat gas to be recovered, and the second end of the second pipe 15 is connected to the heat exchanger 13; the waste heat gas to be recovered enters the heat exchanger 13 through the first pipe 14, and after the heat exchanger 13 exchanges heat with the waste heat gas to be recovered, it is discharged through the second pipe 15;

[0044] The second end of the heat exchanger 13 is provided with a first outlet 131 and a first inlet 132, and the first outlet 131 and the first inlet 132 are connected to the heat pump device 2.

[0045] In this embodiment of the present invention, a normally open shut-off valve is provided on the first pipe 14 and the second pipe 15, and a normally closed shut-off valve is provided between the first pipe 14 and the second pipe 15, so that it can be adjusted and used during maintenance.

[0046] In this embodiment of the present invention, the heat exchanger 13 may optionally be a plate heat exchanger.

[0047] In this embodiment of the invention, a heat exchange device 1 is installed in the evaporative cooling zone of the system, and the pipeline of the gas to be recovered is connected, so that the waste heat of the gas to be recovered is transferred to the circulating water at the evaporation end of the low-temperature heat pump through heat exchange. Specifically, the heat in the gas to be recovered is transferred out by setting a heat exchanger. The plate heat exchanger has a large heat exchange surface area, and the flow mode of the fluid between the plates makes the heat transfer efficiency high, which can achieve a good heat exchange effect. It is also small in size and light in weight, saving installation space.

[0048] The heat pump device 2 includes: a low-temperature heat pump 21 and a high-temperature heat pump 22, which are connected in series. The first end of the low-temperature heat pump 21 is connected to the second end of the heat exchange device 1, the second end of the low-temperature heat pump 21 is connected to the first end of the high-temperature heat pump 22, and the second end of the high-temperature heat pump 22 is connected to the energy storage device 3.

[0049] In this embodiment of the present invention, the heat pump device 2 may optionally include: a third pipe 23, a fourth pipe 24, a fifth pipe 25, a sixth pipe 26, a first water pump group 27, and a second water pump group 28.

[0050] The first end of the third pipe 23 is connected to the first outlet 131 of the heat exchange device 1, and the second end of the third pipe 23 is connected to the first end of the low-temperature heat pump 21; the first end of the fourth pipe 24 is connected to the first inlet 132 of the heat exchange device 1, and the second end of the fourth pipe 24 is connected to the first end of the low-temperature heat pump 21.

[0051] The first end of the fifth pipe 25 is connected to the second end of the low-temperature heat pump 21, and the second end of the fifth pipe 25 is connected to the first end of the high-temperature heat pump 22; the first end of the sixth pipe 26 is connected to the second end of the low-temperature heat pump 21, and the second end of the sixth pipe 26 is connected to the first end of the high-temperature heat pump 22.

[0052] The first water pump set 27 is installed on the fourth pipe 24; the second water pump set 28 is installed on the fifth pipe 25.

[0053] In this embodiment of the present invention, optionally, the first and second water pump groups are equipped with three sets of water pumps, two of which are in use and one of which is a standby water pump. Each set of water pumps includes a pump body, a check valve, a manual butterfly valve, and a pressure gauge. In the pump group, the pump body is responsible for fluid delivery, the check valve prevents backflow, the manual butterfly valve is used for flow regulation and shut-off, and the pressure gauge provides pressure monitoring to ensure the efficient, safe, and stable operation of the pump system. Each pump group is also equipped with a corresponding temperature transmitter, which monitors and protects the equipment in real time, improving system efficiency and reliability and ensuring the safe and stable operation of the water pumps.

[0054] In this embodiment of the invention, a heat pump is used to transfer heat from a low-temperature environment to a high-temperature environment with a small amount of electrical energy, providing a relatively large amount of heat or cooling with less electrical energy, saving energy costs. Furthermore, the heat pump device provides uniform temperature control, making the system more stable and efficient in operation.

[0055] In this embodiment of the present invention, the low-temperature heat pump 21 may optionally include a first evaporator 211 and a first condenser 212;

[0056] The first evaporator 211 has a second inlet 2111 and a second outlet 2112 at its first end. The second inlet 2111 is connected to the heat exchange device 1 through a third pipe 23. The second outlet 2112 is connected to the heat exchange device 1 through a fourth pipe 24. The second end of the first evaporator 211 is connected to the first end of the first condenser 212.

[0057] The second end of the first condenser 212 is provided with a third outlet 2121 and a third inlet 2122; the third outlet 2121 is connected to the high-temperature heat pump 22 through the fifth pipe 25; the third inlet 2122 is connected to the high-temperature heat pump 22 through the sixth pipe 26.

[0058] In this embodiment of the present invention, the high-temperature heat pump may optionally include a second evaporator 221 and a second condenser 222;

[0059] The first end of the second evaporator 221 is provided with a fourth inlet 2211 and a fourth outlet 2212. The fourth inlet 2211 is connected to the low-temperature heat pump 21 through a fifth pipe 25; the fourth outlet 2212 is connected to the low-temperature heat pump 21 through a sixth pipe 26; the second end of the second evaporator 221 is connected to the first end of the second condenser 222.

[0060] The second end of the second condenser 222 is provided with a fifth outlet 2221 and a fifth inlet 2222; the fifth outlet 2221 and the fifth inlet 2222 are connected to the energy storage device 3.

[0061] In this embodiment of the invention, a small amount of electrical energy is input into the low-temperature heat pump 21, causing it to absorb heat from the evaporation end and release it to the condenser end for circulating water. Then, electrical energy is input into the high-temperature heat pump 22, causing it to absorb heat from the evaporation end and release it to the condenser end, ultimately achieving the goal of heating hot water. The pump group and the outlet temperature are controlled by PID (Proportional Integral Derivative). Specifically, the outlet temperature of the condenser end of the high-temperature heat pump 22 can be set to 95°C according to the actual situation, thereby achieving constant temperature water output and reducing the steam consumption of the packaging.

[0062] Specifically, the heat pump system employs a series connection of low-temperature and high-temperature heat pumps. Both the high and low-temperature heat pumps utilize dual compressors, each with four energy levels: 25%, 50%, 75%, and 100%. When the waste heat load of the gas to be recovered is low, the heat pump can be adjusted to a low load as needed; conversely, when the waste heat load is high, the heat pump can be adjusted to a high load, effectively addressing load variations and providing a wider adjustment range. By configuring the heat pump to regulate energy based on the temperature at the evaporator end, dual temperature control of both the evaporator and condenser ends is achieved, resulting in more stable and efficient system operation. Ultimately, the waste heat from the gas to be recovered is transferred to the energy storage water system, achieving the goal of comprehensive waste heat utilization.

[0063] The water replenishment device 4 is connected to the heat pump device 2 and the energy storage device 3 respectively, and replenishes water to the heat pump device 2 and the heat exchange device 1.

[0064] In this embodiment of the invention, a heat exchange device, a heat pump device, an energy storage device, and a water replenishment device are provided. The first end of the heat exchange device has a first air inlet and a first air outlet. The waste heat gas to be recovered enters the heat exchange device through the first air inlet, circulates internally, and is discharged through the first air outlet. The second end of the heat exchange device is connected to the heat pump device. The heat pump device includes a low-temperature heat pump and a high-temperature heat pump connected in series. The first end of the low-temperature heat pump is connected to the second end of the heat exchange device, the second end of the low-temperature heat pump is connected to the first end of the high-temperature heat pump, and the second end of the high-temperature heat pump is connected to the energy storage device. The water replenishment device is connected to both the heat pump device and the energy storage device to replenish water to both devices. This system recovers and utilizes the waste heat from the gas, heating the stored water for subsequent steps, maximizing waste heat utilization, achieving significant energy savings, and solving the problem of the lack of efficient waste heat recovery systems in existing systems.

[0065] In this embodiment of the present invention, the energy storage device 3 may optionally include: a seventh pipe 31, an eighth pipe 32, a third water pump group 33, and an energy storage tank 34.

[0066] The first end of the seventh pipe 31 is connected to the fifth outlet 2221 of the high-temperature heat pump 22, and the second end of the seventh pipe 31 is connected to the first end of the energy storage tank 34.

[0067] The first end of the eighth pipe 32 is connected to the fifth inlet 2222 of the high-temperature heat pump 22, and the second end of the eighth pipe 32 is connected to the second end of the energy storage tank 34; wherein, the first end of the energy storage tank 34 is positioned higher than the second end;

[0068] The third water pump unit 33 is installed on the eighth pipe 32.

[0069] In this embodiment of the invention, the third pump group 33 is equipped with two sets of pumps, one of which is the pump in use and the other is a standby pump. Each pump group includes a pump body, a check valve, a manual butterfly valve, and a pressure gauge. In the pump group, the pump body is responsible for fluid delivery, the check valve prevents backflow, the manual butterfly valve is used for flow regulation and shut-off, and the pressure gauge provides pressure monitoring to ensure the efficient, safe, and stable operation of the pump system. Each pump group is also equipped with a corresponding temperature transmitter, which monitors and protects the equipment in real time, improving system efficiency and reliability and ensuring the safe and stable operation of the pumps.

[0070] In this embodiment of the utility model, the energy storage tank 34 is provided with at least one water storage layer, which is arranged in descending order of temperature. That is, the energy storage water with the highest temperature or the energy storage water that has just been delivered is placed on the upper layer, and the energy storage water with a lower temperature or a decrease in temperature is placed on the lower layer, so that the energy storage water in the energy storage device that does not meet the preset temperature requirements can be input into the high-temperature heat pump for circulation and reheating, thereby realizing the circulation of energy.

[0071] In this embodiment of the present invention, the energy storage device may optionally include: a ninth pipe 35, a pneumatic butterfly valve 36, and a temperature transmitter 37.

[0072] The ninth pipe is located between the seventh and eighth pipes; a pneumatic butterfly valve is installed on the ninth pipe.

[0073] The temperature transmitter is installed on the seventh pipe at one end near the energy storage tank.

[0074] In this embodiment of the invention, a pneumatic butterfly valve is used to control fluid flow by means of a pneumatic drive device, which can realize flow control and opening and closing functions, providing a flexible operation mode in the automation system; and a corresponding temperature transmitter is set up to monitor and protect the equipment in real time, thereby improving the efficiency and reliability of the system and ensuring the safe and stable operation of the water pump.

[0075] In this embodiment of the present invention, the optional water replenishment device 4 includes: a tenth pipe 41, an eleventh pipe 42, and an expansion tank 43;

[0076] The first end of the tenth pipe 41 is connected to the expansion tank 43, and the second end of the tenth pipe 41 is connected to the fourth pipe 24.

[0077] The first end of the eleventh pipe 42 is connected to the expansion tank 43, and the second end of the eleventh pipe 42 is connected to the fifth pipe 25.

[0078] In this embodiment of the invention, the expansion tank 43 replenishes water to the heat pump device 2 and the heat exchange device 1. The expansion tank 43 compensates for temperature changes, stabilizes pressure, and regulates water level, effectively managing the water volume and pressure in the system and ensuring the safe, stable, and efficient operation of the system.

[0079] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0080] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0081] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A waste heat recovery system, characterized in that, include: Heat exchangers, heat pumps, energy storage devices, and water supply systems; The heat exchange device is provided with a first air inlet and a first air outlet at its first end; The waste heat gas to be recovered enters the heat exchange device from the first air inlet at the first end of the heat exchange device, and after circulating inside the heat exchange device, it is discharged from the first air outlet at the first end of the heat exchange device. The second end of the heat exchange device is connected to the heat pump device; The heat pump device includes a low-temperature heat pump and a high-temperature heat pump, which are connected in series. The first end of the low-temperature heat pump is connected to the second end of the heat exchange device, the second end of the low-temperature heat pump is connected to the first end of the high-temperature heat pump, and the second end of the high-temperature heat pump is connected to the energy storage device. The water replenishment device is connected to the heat pump device and the energy storage device respectively, and replenishes water to the heat pump device and the heat exchange device.

2. The waste heat recovery system according to claim 1, characterized in that, The heat exchange device includes a heat exchanger, a first pipe, and a second pipe; a first end of the first pipe is connected to the inlet of the waste heat gas to be recovered, and a second end of the first pipe is connected to the heat exchanger; a first end of the second pipe is connected to the outlet of the waste heat gas to be recovered, and a second end of the second pipe is connected to the heat exchanger; the waste heat gas to be recovered enters the heat exchanger through the first pipe, and after the heat exchanger exchanges heat with the waste heat gas to be recovered, it is discharged through the second pipe; The heat exchanger is provided with a first outlet and a first inlet at its second end, and the first outlet and the first inlet are connected to the heat pump device.

3. The waste heat recovery system according to claim 2, characterized in that, The heat exchanger is a plate heat exchanger.

4. The waste heat recovery system according to claim 2, characterized in that, The heat pump device also includes: a third pipe, a fourth pipe, a fifth pipe, a sixth pipe, a first water pump group, and a second water pump group; The first end of the third pipe is connected to the first outlet of the heat exchange device, and the second end of the third pipe is connected to the first end of the low-temperature heat pump; the first end of the fourth pipe is connected to the first inlet of the heat exchange device, and the second end of the fourth pipe is connected to the first end of the low-temperature heat pump. The first end of the fifth pipe is connected to the second end of the low-temperature heat pump, and the second end of the fifth pipe is connected to the first end of the high-temperature heat pump; the first end of the sixth pipe is connected to the second end of the low-temperature heat pump, and the second end of the sixth pipe is connected to the first end of the high-temperature heat pump. The first water pump set is installed on the fourth pipe; the second water pump set is installed on the fifth pipe.

5. The waste heat recovery system according to claim 4, characterized in that, The low-temperature heat pump includes a first evaporator and a first condenser; The first evaporator has a second water inlet and a second water outlet at its first end. The second water inlet is connected to the heat exchange device through the third pipe. The second water outlet is connected to the heat exchange device through the fourth pipe. The second end of the first evaporator is connected to the first end of the first condenser. The second end of the first condenser is provided with a third water outlet and a third water inlet; the third water outlet is connected to the high-temperature heat pump through the fifth pipe; the third water inlet is connected to the high-temperature heat pump through the sixth pipe.

6. The waste heat recovery system according to claim 4, characterized in that, The high-temperature heat pump includes a second evaporator and a second condenser; The second evaporator has a fourth water inlet and a fourth water outlet at its first end. The fourth water inlet is connected to the low-temperature heat pump through the fifth pipe. The fourth water outlet is connected to the low-temperature heat pump through the sixth pipe. The second end of the second evaporator is connected to the first end of the second condenser. The second condenser is provided with a fifth water outlet and a fifth water inlet at its second end; the fifth water outlet and the fifth water inlet are connected to the energy storage device.

7. The waste heat recovery system according to claim 6, characterized in that, The energy storage device includes: a seventh pipeline, an eighth pipeline, a third water pump set, and an energy storage tank; The first end of the seventh pipe is connected to the fifth outlet of the high-temperature heat pump, and the second end of the seventh pipe is connected to the first end of the energy storage tank. The first end of the eighth pipe is connected to the fifth inlet of the high-temperature heat pump, and the second end of the eighth pipe is connected to the second end of the energy storage tank; wherein, the first end of the energy storage tank is positioned higher than the second end. The third water pump set is installed on the eighth pipeline.

8. The waste heat recovery system according to claim 7, characterized in that, The energy storage device also includes: a ninth pipeline, a pneumatic butterfly valve, and a temperature transmitter; The ninth pipe is located between the seventh pipe and the eighth pipe; a pneumatic butterfly valve is installed on the ninth pipe; The temperature transmitter is installed on the seventh pipeline at one end near the energy storage tank.

9. The waste heat recovery system according to claim 7, characterized in that, The first and second pump groups are equipped with three sets of pumps, two of which are in use and one of which is a standby pump; the third pump group is equipped with two sets of pumps, one of which is in use and the other of which is a standby pump.

10. The waste heat recovery system according to claim 4, characterized in that, The water replenishment device includes: a tenth pipe, an eleventh pipe, and an expansion tank; The first end of the tenth pipe is connected to the expansion tank, and the second end of the tenth pipe is connected to the fourth pipe; The first end of the eleventh pipe is connected to the expansion tank, and the second end of the eleventh pipe is connected to the fifth pipe.

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