CN220229698U - Waste heat recovery system - Google Patents

Abstract

The utility model relates to the technical field of heat energy cooling, in particular to a waste heat recovery system, which comprises a vapor compression unit, a heat source cooling unit and a heat recovery unit, wherein the vapor compression unit comprises an evaporator, a compressor, a condenser and an expansion valve, a refrigerant circulates in a refrigerating loop formed by a first refrigerant flow channel of the evaporator, a second refrigerant flow channel of the compressor and the condenser and the expansion valve, the heat source cooling unit comprises a heat source, a cooling liquid tank and a first liquid pump, a first cooling liquid circulates in the cooling loop formed by the heat source, the first cooling liquid flow channel of the evaporator, the cooling liquid tank and the first liquid pump to cool the heat source, the heat recovery unit comprises a hot liquid tank and a second liquid pump, and a second cooling liquid circulates in a heating loop formed by the hot liquid tank, the second liquid pump and the second cooling liquid flow channel of the condenser to heat liquid in the hot liquid tank. The waste heat recovery system provided by the utility model realizes the recovery and utilization of heat, reduces the heat emission to the environment, and is environment-friendly and energy-saving.

Description

Waste heat recovery system

Technical Field

The utility model relates to the technical field of heat source cooling, in particular to a waste heat recovery system.

Background

The optical storage filling and discharging, optical storage filling and detecting and other equipment can generate a large amount of heat during operation, and the high-temperature device must be cooled. The cooling equipment in the prior art generally adopts a fan to take out heat and discharge the heat into the atmosphere, and the mode has the problems of poor heat dissipation effect, high energy consumption, high cost, high noise, unavailable heat discharge, environmental pollution and the like.

The utility model patent with the application number of 202211569082.2 and the name of a cooling system of a charging system and a control method thereof discloses a cooling system, which comprises a vapor compression condensing unit and a forced convection cooling unit, wherein the vapor compression condensing unit and the forced convection cooling unit share an evaporator, and the power module is cooled by evaporating and absorbing heat through the evaporator.

Disclosure of Invention

The utility model provides a waste heat recovery system for solving the technical problems that heat energy cannot be reused and the environment is polluted in the existing cooling system, and the waste heat recovery system can recover waste heat generated by a heat source to provide domestic heat energy for bathing, air conditioning, floor heating and the like, so that the heat emission to the environment is reduced, and the system is environment-friendly and energy-saving.

The technical scheme adopted by the utility model is as follows:

a waste heat recovery system, comprising:

a vapor compression unit including an evaporator including a first refrigerant flow passage and a first coolant flow passage, a compressor including a second refrigerant flow passage and a second coolant flow passage, a condenser, and an expansion valve, the refrigerant circulating in a refrigeration circuit formed by the first refrigerant flow passage, the compressor, the second refrigerant flow passage, and the expansion valve;

the heat source cooling unit comprises a heat source, a cooling liquid tank and a first liquid pump, wherein first cooling liquid circulates in a cooling loop formed by the heat source, the first cooling liquid flow channel, the cooling liquid tank and the first liquid pump to cool the heat source;

and the heat recovery unit comprises a hot liquid tank and a second liquid pump, and the second cooling liquid circulates in a heating loop formed by the hot liquid tank, the second liquid pump and the second cooling liquid flow passage to heat the liquid in the hot liquid tank.

Optionally, the liquid in the second cooling liquid and the hot liquid tank is water, and a liquid outlet is arranged on the hot liquid tank and is used for discharging hot water.

Optionally, the hot liquid box is provided with a liquid outlet and a liquid return port, and the liquid outlet and the liquid return port are connected with a liquid heating pipe for heating. Preferably, the liquid in the second cooling liquid and the hot liquid tank is water.

Further, the hot liquid tank is further provided with a liquid supplementing port, a ball float valve is arranged in the hot liquid tank and connected with the liquid supplementing port, and when the liquid level in the hot liquid tank is lower than a set liquid level threshold value, the ball float valve is opened, and the liquid supplementing port supplements liquid into the hot liquid tank.

Further, the hot liquid tank further comprises a temperature sensor, an electromagnetic valve, a liquid supplementing port and an overflow port, wherein the electromagnetic valve is connected with the liquid supplementing port, when the temperature sensor detects that the liquid temperature in the hot liquid tank exceeds a set high-temperature threshold value, the electromagnetic valve is opened, cold liquid is forcibly supplemented into the hot liquid tank through the liquid supplementing port, and redundant liquid flows out from the overflow port.

Further, a temperature sensor and an electric heater are further arranged in the hot liquid tank, and when the temperature sensor detects that the temperature of liquid in the hot liquid tank is lower than a set low-temperature threshold value, the electric heater is used for assisting in heating.

Further, the number of the hot liquid tanks is at least two, and at least two hot liquid tanks are arranged in parallel or independently.

Further, the heat source is a heating component in the optical storage and filling system.

Further, at least two heat sources are arranged in parallel.

Further, a temperature measuring device is arranged at the heat source, and the heat source cooling unit, the vapor compression unit and the heat recovery unit start to work when the temperature measuring device detects that the temperature reaches the starting condition.

The utility model has the beneficial effects that:

the waste heat recovery system provided by the utility model adopts a liquid cooling mode to cool the heat source, has a good cooling effect, and has the advantages of no operation of a fan, low energy consumption and low noise.

The waste heat recovery system provided by the utility model only needs to be connected with a heat source through the pipeline connector, does not need to be provided with a fan, is convenient to produce and install and maintain in the later period, has high protection level and has long service life.

According to the waste heat recovery system provided by the utility model, the evaporator is provided with the first refrigerant flow channel and the first cooling liquid flow channel, the condenser is provided with the second refrigerant flow channel and the second cooling liquid flow channel, so that independent circulation of each fluid is ensured, sufficient heat dissipation is realized, and the heat source cooling unit, the vapor compression unit and the heat recovery unit are relatively independent, and the reliability is high.

The waste heat recovery system provided by the utility model completely converts the heat generated by the heat source into high-temperature heat energy, and is recycled to provide heat energy required by life, so that the heat emission to the environment is eliminated, the environment is protected, the energy is saved, and the production of clean energy is realized.

Drawings

Fig. 1 is a schematic diagram of a waste heat recovery system according to the first embodiment;

FIG. 2 is a schematic diagram of a waste heat recovery system applied to a photo-storage and charging system;

fig. 3 is a schematic diagram of the structure of the waste heat recovery system according to the second embodiment.

Wherein,

the vapor compression unit 1, the evaporator 11, the first refrigerant flow passage 111, the first cooling liquid flow passage 112, the compressor 12, the condenser 13, the second refrigerant flow passage 131, the second cooling liquid flow passage 132, the expansion valve 14, the first connection pipe 15;

a heat source cooling unit 2, a heat source 21, a cooling liquid tank 22, a first liquid pump 23, and a second connecting pipe 24;

the heat recovery unit 3, the hot liquid tank 31, the liquid outlet 311, the liquid return port 312, the liquid supplementing port 313, the float valve 314, the temperature sensor 315, the electromagnetic valve 316, the overflow port 317, the electric heater 318, the second liquid pump 32 and the third connecting pipeline 33.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model aims to provide a waste heat recovery system which comprises three parts, wherein the first part is a heat source cooling unit for cooling a heat source generating heat, the second part is a vapor compression unit for performing heat exchange with the heat source cooling unit through an evaporator, the third part is a heat recovery unit for performing heat exchange with a condenser in the vapor compression unit, and the recovered heat energy is used for providing living heat energy such as bathing, air conditioning, floor heating and the like, so that the heat recovery and the utilization are realized, the heat emission to the environment is reduced, the environment is protected, the energy is saved, and the system also has the advantages of no fan in operation, equipment volume reduction, noise reduction, energy conservation, cost reduction and the like. The waste heat recovery system is not only suitable for the light storage and charging system, but also suitable for other use scenes with larger heating value, and can realize heat recovery and reduce heat emission. Specific examples will be described below.

Embodiment one:

as shown in fig. 1, the present embodiment provides a waste heat recovery system including a vapor compression unit 1, a heat source cooling unit 2, and a heat recovery unit 3, wherein the vapor compression unit 1 includes an evaporator 11, a compressor 12, a condenser 13, and an expansion valve 14, the evaporator 11 includes a first refrigerant flow passage 111 and a first cooling liquid flow passage 112, the condenser 13 includes a second refrigerant flow passage 131 and a second cooling liquid flow passage 132, the evaporator 11, the compressor 12, the condenser 13, the expansion valve 14, and the first connection pipe 15 form a refrigeration circuit in which a refrigerant circulates; further, the heat source cooling unit 2 includes a heat source 21, a cooling liquid tank 22, and a first liquid pump 23, wherein the heat source 21 is a heat generating component/a cooled component, and the heat source 21, a first cooling liquid flow passage 112 in the evaporator 11, the cooling liquid tank 22, the first liquid pump 23, and a second connection pipe 24 form a cooling circuit, and a cooling liquid circulates in the cooling circuit to cool the heat source 21; further, the heat recovery unit 3 includes a hot liquid tank 31 and a second liquid pump 32, and the hot liquid tank 31, the second liquid pump 32, a second cooling liquid flow path 132 in the condenser 13, and a third connecting line 33 form a heating circuit in which the second cooling liquid circulates to heat the liquid in the hot liquid tank 31.

In the heat source cooling unit 2, the cooling mode of the heat source 21 is liquid cooling, the first cooling liquid in the cooling liquid tank 22 circulates in the cooling circuit, specifically, the first cooling liquid is selected but not limited to water or glycol water solution, etc., the first liquid pump 23 supplies power to input the low-temperature fluid in the cooling liquid tank 22 into the heat source 21, absorbs the heat generated by the heat source 21, becomes the medium-low-temperature fluid and flows into the evaporator 11, exchanges heat with the ultralow-temperature refrigerant in the evaporator 11, and becomes the low-temperature liquid after releasing the heat to flow into the cooling liquid tank 22, so that the first cooling liquid circulates in the cooling circuit.

In the vapor compression unit 1, a refrigerant circulates in a refrigeration circuit, specifically, the refrigerant is optionally but not limited to R32 refrigerant, R410A refrigerant, R134A refrigerant, etc., and is compressed into an ultra-high temperature refrigerant by the work of the compressor 12, the ultra-high temperature refrigerant releases heat in the condenser 13 to become an intermediate temperature refrigerant, the intermediate temperature refrigerant becomes an ultra-low temperature refrigerant after being throttled by the expansion valve 14, and flows into the evaporator 11 to exchange heat with a fluid of intermediate and low temperature in the cooling circuit, so that the refrigerant circulates in the refrigeration circuit.

In the heat recovery unit 3, the second cooling liquid in the hot liquid tank 31 circulates in the heating circuit, specifically, the second cooling liquid is optionally but not limited to water or glycol water solution, etc., the second liquid pump 32 is used for providing power, medium-temperature fluid is input into the condenser 13 to exchange heat with the ultrahigh-temperature refrigerant in the refrigeration circuit, the heat is absorbed and becomes high-temperature fluid, the high-temperature fluid flows into the hot liquid tank 31 again, and the reciprocating circulation is carried out until the set temperature is reached. Although the second cooling liquid in this embodiment has a cooling double word, it is not represented by a cooling effect, and it is a function of reciprocating in the heating circuit until the liquid in the hot liquid tank 31 is heated to a set temperature.

In this way, the waste heat recovery system provided in this embodiment cools the heat source 21 in a liquid cooling manner, and compared with the prior art, the whole system has no fan operation, low energy consumption, low noise and better heat dissipation and cooling effects; and only need connect heat source 21 through the pipeline joint, need not to install the fan, convenient production installation and later maintenance, the protection level is high, and whole system's long service life. The evaporator 11 of the present embodiment is provided with the first refrigerant flow channel 111 and the first cooling liquid flow channel 112, the condenser 13 is provided with the second refrigerant flow channel 131 and the second cooling liquid flow channel 132, so that the independent circulation of each fluid and sufficient heat dissipation are ensured, and the heat source cooling unit 2, the vapor compression unit 1 and the heat recovery unit 3 are relatively independent, so that the reliability is high. Most importantly, the embodiment completely converts the heat generated by the heat source 21 into high-temperature heat energy, and recycles the heat energy to provide heat energy required by life, eliminates heat emission to the environment, is environment-friendly and energy-saving, and realizes clean energy production.

As an embodiment of the present utility model, the hot liquid tank 31 is used for providing domestic hot water for bathing, specifically, the second cooling liquid and the liquid in the hot liquid tank 31 are both water, and the hot liquid tank 31 is provided with a liquid outlet 311, and the liquid outlet 311 is used for discharging hot water for bathing. Further, in this embodiment, the hot water tank 31 is further provided with a fluid-supplementing port 313, and the fluid-supplementing port 313 is used for supplementing tap water, and the supplemented tap water is heated to be hot water for use. In this embodiment, a float valve 314 is further provided to automatically replenish water, the float valve 314 is connected to the liquid replenishing port 313, when the liquid level in the hot liquid tank 31 is lower than a set liquid level threshold, the float ball descends, the valve of the float valve 314 opens, tap water is replenished into the hot liquid tank 31 through the liquid replenishing port 313, and when replenishment is in place, the float ball ascends to close the valve and stop replenishing water.

Since the hot water tank 31 in the present embodiment is used for providing domestic hot water such as bathing, it is necessary to ensure that the liquid temperature in the hot water tank 31 is always within a set temperature range, for this purpose, the temperature sensor 315 is provided to detect the water temperature in the hot water tank 31, and when the water temperature exceeds a set high temperature threshold, the temperature is reduced by forced water replenishment; when the water temperature is lower than the set low temperature threshold, the water in the hot water tank 31 is heated by electric heating.

Specifically, in this embodiment, a temperature sensor 315 is disposed in the hot-liquid tank 31, and an electromagnetic valve 316 and an overflow port 317 are further disposed on the hot-liquid tank 31, where the electromagnetic valve 316 is connected to the overflow port 313, when the temperature sensor 315 detects that the water temperature in the hot-liquid tank 31 exceeds a set high-temperature threshold, the electromagnetic valve 316 is opened, cold tap water is forcibly replenished into the hot-liquid tank 31 through the overflow port 313, the water level in the hot-liquid tank 31 rises, if the size of the hot-liquid tank 31 is large enough, tap water can be replenished all the time, but a special situation of excessive water replenishment may occur, so that in order to ensure that sufficient space is provided in the hot-liquid tank to replenish tap water, the overflow port 317 is provided, so that excessive hot water flows out from the overflow port 317, and the water level is still in a safe state under special circumstances, and the heat recovery system can work normally. The fluid make-up port 313 may be located further from the overflow port 317 such that the overflowed fluid is substantially hot water. In addition, the electromagnetic valve 316 and the float valve 314 are connected in parallel, that is, they are respectively connected with the fluid-filling port 313, so that it is ensured that water can be filled in the case of water shortage or ultrahigh water temperature, and the two are not affected.

Further, an electric heater 318 is further provided in the hot liquid tank 31, when the temperature sensor 315 detects that the second cooling liquid, that is, the water in the hot liquid tank 31 absorbs heat through the condenser 13 and circulates in the heating circuit for a certain time, the electric heater 318 is turned on to perform auxiliary heating when the temperature of the liquid in the hot liquid tank 31 is still lower than the set low temperature threshold, so as to ensure that the water temperature can meet the actual hot water temperature. In addition, when the water temperature in winter is too low, the low temperature threshold can be set to be a proper anti-freezing temperature, so that freezing can not occur in cold winter, and pipelines and equipment are prevented from being damaged.

Preferably, at least two heat sources 21 are provided in the present embodiment, and at least two heat sources 21 are connected in parallel, so that the heat emitted by each heat source 21 is not transferred to the next heat source 21, that is, each heat source 21 inlet is a low-temperature fluid, thereby ensuring the cooling effect of each heat source 21.

Preferably, in the present embodiment, a temperature measuring device is provided at each heat source 21, and when the temperature measuring device detects that the temperature reaches the start-up condition, the heat source cooling unit 2, the vapor compression unit 1, and the heat recovery unit 3 start to operate. Specifically, first, the first liquid pump 23 is started, the first cooling liquid starts to circulate, then the vapor compression unit is started to transfer heat to the heat recovery unit, then the second liquid pump 32 is started, the second cooling liquid starts to circulate, the temperature of water in the hot liquid tank 31 rises, at this time, the temperature of the hot liquid tank 31 is detected, a set constant temperature is satisfied for domestic hot water required for bathing and the like, proper water supplementing and temperature control are performed when the water temperature is too high, the electric heater 318 is started to control the temperature according to the situation when the water temperature is too low, and automatic water supplementing is performed when the water level is too low.

The waste heat recovery system of the present embodiment may be used in an optical storage and charging system, formed as an optical storage and charging system. Specifically, as shown in fig. 2, the optical storage and charging system comprises a photovoltaic system, a power grid, a power distribution system, an energy storage system, a charging pile and the like, wherein the photovoltaic system and the power grid supply power for the power distribution system; the energy storage system discharges to the power distribution system in peak time and takes electricity from the power distribution system in valley time; the charging pile is powered on the power distribution system to charge charging equipment such as automobiles; the power distribution system is also used for providing domestic electricity. In the embodiment, the waste heat recovery system is applied to the light storage and charging system to form the light storage and charging system, on one hand, the light storage and charging system needs to be maintained in a reasonable use temperature range, generally about 25 ℃, lower temperature can be set according to requirements, heating components/heat sources such as an energy storage system and a charging pile in the light storage and charging system can be cooled, the heat exchange efficiency is improved, the high-power charging and heat dissipation requirements are met, and the high-efficiency and stable work of the light storage and charging system is ensured; the heat in the light storage and heat charging is the heat recovered by the heating device in the cooling, charging and discharging processes, and the recovered heat is used for domestic hot water such as bathing, so that the heat emission to the environment is reduced, and the environment is protected and energy is saved.

Of course, in other embodiments, the waste heat recovery system may also be applied to other scenarios for cooling and waste heat recovery.

From the above, it can be seen that the waste heat recovery system provided in this embodiment adopts the liquid cooling mode to cool, so that the cooling effect is good, and meanwhile, the heat recovery and utilization are realized, the heat emission to the environment is reduced, the environment is protected, the energy is saved, and the waste heat recovery system has the advantages of no fan in operation, equipment volume reduction, noise reduction, energy conservation, cost reduction and the like.

Embodiment two:

as shown in fig. 3, the waste heat recovery system provided in this embodiment also includes a heat source cooling unit 2, a vapor compression unit 1, and a heat recovery unit 3, and is different from the first embodiment in that the hot water tank of this embodiment is used for providing heat energy requirements of an air conditioner, floor heating, and the like.

Specifically, the hot liquid tank 31 of the present embodiment is provided with a liquid outlet 311 and a liquid return port 312, and the liquid outlet 311 and the liquid return port 312 are connected with a liquid heating pipe for heating, and the liquid heating pipe is a part of an air conditioner or a floor heater for providing heat energy for heating. In the first embodiment, the liquid outlet is used for discharging hot water, the used water is not returned to the hot liquid tank, and in the present embodiment, the liquid discharged from the liquid outlet 311 and the cold air in the room are subjected to heat exchange and then continuously returned to the hot liquid tank 31 through the liquid return port 312, and the circulation is performed in a reciprocating manner. In other embodiments, the liquid heating pipe may also be directly connected in series in the heating circuit, i.e. the end of the hot liquid tank 31 close to the second liquid pump 32 and the other end close to the condenser 13 are directly formed as the liquid outlet and the liquid return, respectively.

The liquid in the second cooling liquid and hot liquid tank 31 of the present embodiment is optionally, but not limited to, water or an aqueous glycol solution, preferably water.

Similar to the embodiment, the hot fluid tank 31 of the present embodiment further includes a temperature sensor 315, an electromagnetic valve 316, a fluid-filling port 313 and an overflow port 317, the electromagnetic valve 316 is connected to the fluid-filling port 313, when the temperature sensor 315 detects that the temperature of the fluid in the hot fluid tank 31 exceeds a set high temperature threshold for heating, the electromagnetic valve 316 is opened, the fluid-filling port 313 forcibly supplements cold fluid into the hot fluid tank 31, and the redundant fluid flows out from the overflow port 317. Also, the embodiment further comprises an electric heater 318, and when the temperature sensor 315 detects that the temperature of the liquid in the hot liquid tank 31 is lower than the set low temperature threshold value for heating or the antifreezing low temperature threshold value, the electric heater 318 is used for assisting in heating. In addition, the hot fluid tank 31 of the present embodiment further includes a float valve 314, where the float valve 314 is connected to the fluid replenishment port 313, and when the liquid level of the second cooling fluid is too low due to volatilization or the like, the valve of the float valve 314 is opened, and the fluid replenishment port 313 supplements the hot fluid tank 31 with the fluid.

The waste heat recovery system of the present embodiment is also optionally but not limited to be applied to the light storage and charging system and other scenarios. Other parts may be executed with reference to the first embodiment, and will not be described herein.

As can be seen from the above, the waste heat recovery system provided in this embodiment can convert the heat generated by the heat source into heat energy for use by an air conditioner, a floor heater, etc., thereby realizing recycling of heat energy and reducing heat emission to the environment.

Embodiment III:

the present embodiment provides a waste heat recovery system also including a heat source cooling unit 2, a vapor compression unit 1, and a heat recovery unit 3. The difference between the first embodiment and the second embodiment is that at least two hot-liquid tanks 31 are provided, and at least two hot-liquid tanks 31 are connected in parallel, that is, the inlets of the hot-liquid tanks 31 are commonly input with high-temperature fluid after heat exchange by the condenser 13, so that the heating is more uniform. The hot water tanks 31 may be all of the solutions for supplying hot water for bath in the first embodiment, or all of the solutions for supplying heat energy for air conditioning and floor heating in the second embodiment, or may be combined with the solutions of the first and second embodiments, and this embodiment is not limited thereto.

Preferably, each hot-liquid tank 31 may be independently arranged, and an independent heating circuit is adopted, that is, a plurality of second cooling liquid flow channels 132 are arranged in the condenser 13, and each cooling liquid flow channel 132 forms a heating circuit with one hot-liquid tank 31 and one second liquid pump 32, and liquids in each heating circuit do not influence each other.

The waste heat recovery system of the present embodiment is optionally but not limited to be applied to the light storage and charging system and other scenarios. The other parts can be executed with reference to the first embodiment/the second embodiment, and will not be described herein.

As can be seen from the above, the waste heat recovery system provided in this embodiment can convert the heat generated by the heat source into heat energy for use in bathing, air conditioning, floor heating, etc., thereby realizing heat energy recovery and utilization and reducing heat emission to the environment.

In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Claims (10)

1. A waste heat recovery system, comprising:

a vapor compression unit (1), the vapor compression unit (1) comprising an evaporator (11), a compressor (12), a condenser (13) and an expansion valve (14), the evaporator (11) comprising a first refrigerant flow passage (111) and a first cooling liquid flow passage (112), the condenser (13) comprising a second refrigerant flow passage (131) and a second cooling liquid flow passage (132), the refrigerant circulating in a refrigeration circuit formed by the first refrigerant flow passage (111), the compressor (12), the second refrigerant flow passage (131) and the expansion valve (14);

the heat source cooling unit (2), the heat source cooling unit (2) comprises a heat source (21), a cooling liquid tank (22) and a first liquid pump (23), and a first cooling liquid circulates in a cooling loop formed by the heat source (21), a first cooling liquid flow passage (112), the cooling liquid tank (22) and the first liquid pump (23) to cool the heat source (21);

the heat recovery unit (3), the heat recovery unit (3) is including hot liquid case (31) and second liquid pump (32), and the second coolant is circulated in the heating circuit that hot liquid case (31), second liquid pump (32) and second coolant runner (132) formed, heats the liquid in hot liquid case (31).

2. Waste heat recovery system according to claim 1, characterized in that the liquid in the second cooling liquid and hot liquid tank (31) is water, a liquid outlet (311) is arranged on the hot liquid tank (31), and the liquid outlet (311) is used for discharging hot water.

3. Waste heat recovery system according to claim 1, characterized in that the hot liquid tank (31) is provided with a liquid outlet (311) and a liquid return port (312), and the liquid outlet (311) and the liquid return port (312) are connected with a liquid heating pipe for heating.

4. A waste heat recovery system according to claim 2 or 3, wherein the hot fluid tank (31) is further provided with a fluid supplementing port (313), a ball float valve (314) is arranged in the hot fluid tank (31), the ball float valve (314) is connected with the fluid supplementing port (313), when the fluid level in the hot fluid tank (31) is lower than a set fluid level threshold value, the ball float valve (314) is opened, and the fluid supplementing port (313) supplements the fluid in the hot fluid tank (31).

5. A waste heat recovery system according to claim 2 or 3, wherein the hot fluid tank (31) further comprises a temperature sensor (315), a solenoid valve (316), a fluid supplementing port (313) and an overflow port (317), the solenoid valve (316) is connected to the fluid supplementing port (313), when the temperature sensor (315) detects that the temperature of the fluid in the hot fluid tank (31) exceeds a set high temperature threshold value, the solenoid valve (316) is opened, the fluid supplementing port (313) forcibly supplements cold fluid into the hot fluid tank (31), and surplus fluid flows out from the overflow port (317).

6. A waste heat recovery system according to claim 2 or 3, characterized in that a temperature sensor (315) and an electric heater (318) are further arranged in the hot liquid tank (31), and when the temperature sensor (315) detects that the temperature of the liquid in the hot liquid tank (31) is lower than a set low temperature threshold, the electric heater (318) assists in heating.

7. Waste heat recovery system according to claim 1, characterized in that at least two of the hot-liquid tanks (31) are provided, and at least two of the hot-liquid tanks (31) are provided in parallel or independently.

8. Waste heat recovery system according to claim 1, characterized in that the heat source (21) is a heat generating component in a light storage and charging system.

9. Waste heat recovery system according to claim 1 or 8, characterized in that at least two of the heat sources (21) are connected in parallel and at least two of the heat sources (21).

10. Waste heat recovery system according to claim 1 or 8, characterized in that the heat source (21) is provided with temperature measuring means, and that the heat source cooling unit (2), the vapor compression unit (1) and the heat recovery unit (3) start to operate when the temperature measuring means detects that the temperature reaches a start-up condition.