Waste heat recycling system, steam preparation system and wine brewing system

Abstract

The utility model relates to a waste heat recycling system, a steam preparation system and a wine brewing system, comprising a cooling water circulation pipeline which comprises an inlet pipeline, an outlet pipeline, a first branch and a second branch; the on-off assembly is selectively communicated with the first branch or the second branch according to the temperature difference between the cooling water and the waste heat water; the heat pump unit comprises a first heat pump mechanism arranged on the second branch, and the first heat pump mechanism absorbs heat of the waste heat water flowing through the second branch or releases heat to the waste heat water flowing through the second branch according to the temperature difference between the cooling water and the waste heat water; the second heat pump mechanism comprises a heat absorption end and a heat release end, the heat absorption end is used for absorbing the heat of the waste heat water in the outlet pipeline, and the heat release end is used for releasing the heat absorbed by the heat absorption end. The running state of the heat pump unit is improved through waste heat of the heat pump unit, the heating energy efficiency ratio of the heat pump unit is increased, energy consumption is reduced, energy is saved, carbon emission is reduced, and the dual-carbon target is assisted.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery and relates to a waste heat recovery and utilization system, a steam preparation system and a wine brewing system. Background Art

[0002] Fermentation and distillation are the most important links and the most fundamental processes in the production of Chinese liquor, and the implementation of the process depends on the provision of high-temperature steam. At present, most domestic liquor production companies use electric boilers, coal-fired steam boilers or steam boilers to provide high-temperature steam for the distillation process. Coal-fired steam boilers or steam boilers use fossil fuels, which produce a large amount of carbon, nitrogen and other oxides, which are discharged into the atmosphere and have a certain impact on air quality. Furthermore, due to the storage, transportation and combustion of fossil fuels, coal-fired steam boilers or steam boilers have a certain impact on the sanitation management of liquor production plants, which requires special attention.

[0003] Secondly, electric boilers, coal-fired steam boilers or steam boilers are traditional equipment. Even after continuous development and innovation, their efficiency cannot reach 1 to this day, and it is even difficult to approach 1, resulting in low energy utilization and inability to fully utilize energy. Since such boilers cannot recover and utilize the large amount of waste heat and waste hot water generated during the cooling process, they can only discharge the waste hot water directly into the environmental water body, which not only wastes water resources but also causes environmental water pollution.

[0004] In order to reduce thermal pollution of environmental water bodies, some companies use closed cooling towers combined with lithium bromide refrigerators to cool waste hot water, and set up open cooling towers to cool lithium bromide refrigerators, which increases equipment process links, wastes a lot of electricity and energy, and increases corporate production costs and equipment maintenance costs. Utility Model Content

[0005] The utility model aims to provide a waste heat recovery and utilization system, a steam preparation system and a wine-making system, which utilize the waste heat of wine-making through a heat pump unit to prepare high-temperature steam for wine-making distillation, thereby avoiding energy waste and environmental pollution.

[0006] In a first aspect, the utility model provides a waste heat recovery system, comprising:

[0007] A cooling water circulation pipeline, comprising an inlet pipeline, an outlet pipeline, and a first branch and a second branch connected between the inlet pipeline and the outlet pipeline, wherein the first branch and the second branch are arranged in parallel, the inlet pipeline is provided with a waste hot water inlet, and the outlet pipeline is provided with a cooling water outlet;

[0008] an on-off component, arranged on the first branch and the second branch, and used for controlling the selective connection of the first branch or the second branch according to the temperature difference ΔT between the cooling water at the cooling water outlet and the waste hot water at the waste hot water inlet;

[0009] A heat pump unit, comprising:

[0010] a first heat pump mechanism, which is disposed on the second branch, and absorbs heat from the waste hot water flowing through the second branch or releases heat to the waste hot water flowing through the second branch according to the temperature difference ΔT, so as to heat or cool the waste hot water;

[0011] The second heat pump mechanism is arranged on the outlet pipeline, and includes a heat absorbing end and a heat releasing end. The heat absorbing end is used to absorb the heat of the waste hot water in the outlet pipeline. The waste hot water becomes cooling water after being cooled and is discharged from the cooling water outlet. The heat releasing end releases the heat absorbed by the heat absorbing end.

[0012] In some embodiments, under the condition that the temperature difference ΔT is less than T1 or greater than T2, the on-off component controls the first branch to be disconnected and the second branch to be connected, so that the waste hot water flows through the second branch to exchange heat with the first heat pump mechanism;

[0013] When the temperature difference ΔT is between T1 and T2, the on-off component controls the first branch to be connected and the second branch to be disconnected, so that the waste hot water flows to the second heat pump mechanism through the first branch.

[0014] In some embodiments, the environmental conditions are:

[0015] When the temperature difference ΔT is less than T1, the first heat pump mechanism releases heat to the waste hot water flowing through the second branch to increase the temperature of the waste hot water;

[0016] When the temperature difference ΔT is greater than T2, the first heat pump mechanism absorbs heat from the waste hot water flowing through the second branch to cool the waste hot water.

[0017] In some embodiments, the first heat pump mechanism and the second heat pump mechanism are both air source heat pumps.

[0018] In some embodiments, the first heat pump mechanism is a cascade heat pump mechanism or a single-stage heat pump mechanism, and / or the second heat pump mechanism is a cascade heat pump mechanism or a single-stage heat pump mechanism.

[0019] In some embodiments, the on-off assembly includes at least two control valves;

[0020] At least one control valve is disposed on the first branch, and is used to control the on-off of the first branch;

[0021] At least one control valve is disposed on the second branch to control the on-off of the second branch.

[0022] In a second aspect, the utility model provides a steam preparation system, comprising:

[0023] A waste heat recovery system as described in any one of the above embodiments;

[0024] A steam production unit, the steam production unit comprising a flash evaporator, the flash evaporator having a saturated water inlet, a saturated water outlet and a saturated steam outlet;

[0025] The saturated water inlet is connected to the water outlet of the heat release end of the second heat pump mechanism, and the saturated water outlet is connected to the water inlet of the heat release end to form a saturated water circulation pipeline between the heat release end and the flash evaporator;

[0026] The heat releasing end is used to heat the circulating water by the heat generated by the second heat pump mechanism itself and the heat of the waste hot water absorbed by the heat absorbing end, so that the circulating water becomes saturated water;

[0027] After the saturated water enters the flash evaporator, it rapidly boils and vaporizes due to pressure changes, and becomes water vapor and saturated water, wherein the saturated water in the flash evaporator circulates to the heat release end from the saturated water outlet.

[0028] In some embodiments, a circulation pump and / or a water replenishment end is connected between the saturated water outlet and the water inlet of the heat release end.

[0029] In some embodiments, the steam production unit further includes a steam engine, the saturated steam outlet of the flash evaporator is connected to the inlet of the steam engine, and the steam engine is used to heat the steam supplied by the flash evaporator.

[0030] In some embodiments, the steam production unit further includes a steam tank, which is used to store saturated steam and ensure the temperature and pressure of saturated steam; the steam tank is connected to the steam engine.

[0031] In a third aspect, the utility model provides a wine-making system, comprising:

[0032] A steam production system as described in any one of the above embodiments;

[0033] A wine retort connected to a steam generating unit for heating and distilling materials in the wine retort by steam;

[0034] An ice tank connected to the wine retort, and the distilled steam enters the ice tank;

[0035] The ice cylinder exchanges heat with cooling water in the outlet pipeline of the waste heat recovery system to condense the wine vapor in the ice cylinder; after the heat exchange between the cooling water and the ice cylinder, the cooling water becomes waste hot water and is introduced into the inlet pipeline of the waste heat recovery system.

[0036] In some embodiments, a cooling circulation pipeline is provided in the ice cylinder, and the cooling circulation pipeline has a high-temperature water outlet and a low-temperature water inlet;

[0037] The high-temperature water outlet is connected to the inlet pipeline;

[0038] The low-temperature water inlet is connected to the outlet pipeline.

[0039] In some embodiments, a heat exchange mechanism is provided between the cooling circulation pipeline and the cooling water circulation pipeline.

[0040] In some embodiments, the heat exchange mechanism has a first inlet and a first outlet connected by an internal pipe, and a second inlet and a second outlet connected by an internal pipe;

[0041] The high-temperature water outlet is connected to the first inlet, and the low-temperature water inlet is connected to the first outlet;

[0042] The outlet pipeline is connected to the second inlet, and the inlet pipeline is connected to the second outlet.

[0043] In some embodiments, the heat exchange mechanism is any one of a plate heat exchanger, a shell heat exchanger, and a cooling tower.

[0044] In some embodiments, further comprising:

[0045] The wine barrel is connected to the ice tank, and the wine vapor is cooled and condensed into alcohol and then enters the wine barrel for storage.

[0046] In summary, the present application includes at least one of the following beneficial technical effects:

[0047] The waste heat recovery and utilization system of the utility model controls the flow path of the waste hot water in real time according to the temperature difference ΔT between the cooling water and the waste hot water through the on-off component, so that the first heat pump mechanism can cool down or heat the waste hot water when the waste hot water temperature is too high or too low, realize dynamic adjustment of the waste hot water temperature, improve the operating environment of the second heat pump mechanism, ensure that the second heat pump mechanism is in a better operating state, improve the COP of the entire heat pump unit, and meet the heat demand of subsequent processes when the second heat pump mechanism is operating normally, so that the second heat pump mechanism will not be overloaded. Moreover, the utility model utilizes the waste hot water in two stages through the first heat pump mechanism and the second heat pump mechanism, so that the waste heat utilization rate is high, environmental water pollution is avoided, the environmental benefits are more obvious, and the purpose of reducing costs and increasing efficiency is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of a waste heat recovery system according to Embodiment 1 of the present utility model;

[0049] Figure 2 It is a schematic diagram of waste heat flowing through the first branch of the waste heat recovery system of the first embodiment of the utility model;

[0050] Figure 3 It is a schematic diagram of waste hot water of the waste heat recovery system of the first embodiment of the utility model flowing through the second branch to release heat;

[0051] Figure 4 It is a schematic diagram of waste heat of the waste heat recovery system of the first embodiment of the utility model flowing through the second branch to absorb heat;

[0052] Figure 5 The theoretical cycle pressure-enthalpy diagram of the heat pump unit of the waste heat recovery system of the first embodiment of the utility model;

[0053] Figure 6 This is a schematic diagram of a waste heat recovery system according to a fourth embodiment of the present utility model;

[0054] Figure 7 This is a schematic diagram of a waste heat recovery system according to a fifth embodiment of the present utility model;

[0055] Figure 8 This is a schematic diagram of a waste heat recovery system according to a sixth embodiment of the present utility model;

[0056] Fig. 9 This is a schematic diagram of a steam preparation system according to Embodiment 7 of the present utility model;

[0057] Fig.10 This is a schematic diagram of a winemaking system according to Embodiment 8 of the present utility model;

[0058] Fig.11 It is a schematic diagram of a brewing system having a heat exchange structure according to Embodiment 9 of the present utility model;

[0059] Fig.12 This is a flow chart of the use of the wine-making system of Embodiment 9 of the present utility model.

[0060] The reference numerals in the drawings of the specification include: a first heat pump mechanism 100, a second heat pump mechanism 200, a carbon dioxide circulation evaporator 101, a carbon dioxide circulation compressor 102, a carbon dioxide circulation condenser 103, a carbon dioxide circulation throttling device 104, a second control valve 105, a third control valve 106, a first control valve 107, a waste hot water inlet 108, a cooling water outlet 109, a steam outlet 110, a cooling water circulation pipeline 1, an inlet pipeline 111, a first branch Road 112, second branch road 113, outlet pipeline 114, high temperature working medium circulation evaporator 201, high temperature working medium circulation compressor 202, high temperature working medium circulation throttling device 203, high temperature working medium circulation condenser 204, circulation pump 301, flash evaporator 302, steam engine 303, steam tank 304, water supply end 305, wine retort 401, ice cylinder 402, wine barrel 403, heat exchange mechanism 404, cooling circulation pipeline 5, low temperature water inlet 502, high temperature water outlet 501. DETAILED DESCRIPTION

[0061] The technical solution of the utility model is further explained by specific embodiments below, and the specific embodiments do not limit the protection scope of the utility model. Some non-essential modifications and adjustments made by others based on the concept of the utility model still fall within the protection scope of the utility model.

[0062] The utility model provides a waste heat recovery system, comprising:

[0063] A cooling water circulation pipeline, comprising an inlet pipeline, an outlet pipeline, and a first branch and a second branch connected between the inlet pipeline and the outlet pipeline, the first branch and the second branch are arranged in parallel, the inlet pipeline is used to introduce waste hot water, and the outlet pipeline is used to discharge cooling water;

[0064] The on-off component is arranged on the first branch and the second branch, and is used to control the temperature difference ΔT between the cooling water at the cooling water outlet and the waste hot water at the waste hot water inlet to selectively connect the first branch or the second branch;

[0065] A heat pump unit, comprising:

[0066] A first heat pump mechanism is arranged on the second branch, and the first heat pump mechanism absorbs heat from the waste hot water flowing through the second branch or releases heat to the waste hot water flowing through the second branch according to the temperature difference ΔT, so as to heat or cool the waste hot water;

[0067] The second heat pump mechanism is arranged on the outlet pipeline, and includes a heat absorbing end and a heat releasing end. The heat absorbing end is used to absorb the heat of the waste hot water in the outlet pipeline. After the waste hot water is cooled, it becomes cooling water and is discharged from the cooling water outlet. The heat releasing end releases the heat absorbed by the heat absorbing end.

[0068] The waste heat recovery system provided in the embodiment of the utility model has the following three modes when in use:

[0069] 1. When the temperature difference ΔT between the waste hot water and the cooling water is moderate, the on-off component controls the first branch to be connected and the second branch to be disconnected. The waste hot water will flow through the inlet pipe, the first branch and the outlet pipe. When the waste hot water flows through the outlet pipe, the second heat pump mechanism can absorb the heat of the waste hot water and reuse the heat of the waste hot water.

[0070] Second, when the temperature difference ΔT between the waste hot water and the cooling water is too high, the heat of the waste hot water itself will be relatively high, and the heat absorbed by the second heat pump mechanism and the heat generated by the work of the second heat pump mechanism will be much greater than the heat demand of the subsequent process. In this case, the on-off component controls the first branch to be disconnected and the second branch to be connected, and the waste hot water will flow through the inlet pipe, the second branch and the outlet pipe;

[0071] When the waste hot water flows through the second branch, the first heat pump mechanism will absorb the heat of the waste hot water and cool down the waste hot water until the temperature difference ΔT between the cooled waste hot water and the cooling water reaches a moderate range. After the waste hot water flows from the second branch to the outlet pipeline, the second heat pump mechanism will absorb the heat of the waste hot water and reuse the heat of the waste hot water. At this time, the heat of the waste hot water absorbed by the second heat pump mechanism and the heat generated by the work of the second heat pump mechanism just meet the heat requirements of subsequent processes.

[0072] 3. When the temperature difference ΔT between the waste hot water and the cooling water is too low, the heat absorbed by the second heat pump mechanism and the heat generated by the work of the second heat pump mechanism are insufficient to meet the heat demand of the subsequent process. In this case, the on-off component controls the first branch to be disconnected and the second branch to be connected, and the waste hot water will flow through the inlet pipe, the second branch and the outlet pipe;

[0073] When the waste hot water flows through the second branch, the first heat pump mechanism will release heat to the waste hot water, causing the waste hot water to heat up until the temperature difference ΔT between the heated waste hot water and the cooling water reaches a moderate range. After the waste hot water flows from the second branch to the outlet pipeline, the second heat pump mechanism will absorb the heat of the waste hot water and reuse the heat of the waste hot water. At this time, the heat of the waste hot water absorbed by the second heat pump mechanism and the heat generated by the work of the second heat pump mechanism just meet the heat requirements of subsequent processes.

[0074] The waste heat recovery and utilization system of the utility model controls the flow path of the waste hot water in real time according to the temperature difference ΔT between the cooling water and the waste hot water through the on-off component, so that the first heat pump mechanism can cool down or heat the waste hot water when the temperature of the waste hot water is too high or too low, thereby realizing dynamic adjustment of the temperature of the waste hot water, improving the operating environment of the second heat pump mechanism, ensuring that the second heat pump mechanism is in a better operating state, improving the COP of the entire heat pump unit, and meeting the heat demand of subsequent processes when the second heat pump mechanism is operating normally, so that the second heat pump mechanism will not be overloaded.

[0075] Moreover, the first heat pump mechanism can also use the waste hot water's heat absorption and release for other purposes. For example, in a low-temperature environment, the first heat pump mechanism can absorb the waste hot water's heat to heat the heat pump unit and defrost the heat pump unit, thereby realizing multi-stage utilization of waste hot water heat and achieving a high waste heat utilization rate.

[0076] It should be understood that the waste heat recovery system provided in this embodiment can be used to recover waste heat from various industrial waste heat, domestic waste heat, etc., and this embodiment does not limit this. The following is an exemplary description of the recovery and utilization of waste heat generated in the winemaking process.

[0077] Hereinafter, the waste heat recovery system, steam preparation system and brewing system provided by the present invention will be described in detail with reference to the accompanying drawings.

[0078] Embodiment 1

[0079] See also Figure 1 The waste heat recovery system provided in this embodiment includes a cooling water circulation pipeline 1, a switching component and a heat pump unit.

[0080] Among them, the cooling water circulation pipeline 1 is used to realize the circulation of cooling water. Specifically, the cooling water discharged from the outlet of the cooling water circulation pipeline 1 is heat-exchanged with the brewing structure to form waste hot water, and the waste hot water is reintroduced into the cooling water circulation pipeline 1 from the water inlet. The waste hot water is converted into cooling water again after the waste heat utilization and cooling of the heat pump unit, and the cooling water is then discharged from the outlet. In this way, the reciprocating circulation of cooling water in the cooling water circulation pipeline 1 can be realized.

[0081] Specifically, see Figure 1 The cooling water circulation pipeline 1 includes an inlet pipeline 111, an outlet pipeline 114, and a first branch 112 and a second branch 113 connected between the inlet pipeline 111 and the outlet pipeline 114, and the first branch 112 and the second branch 113 are arranged in parallel, wherein the inlet pipeline 111 has a waste hot water inlet 108 for introducing waste hot water; the outlet pipeline 114 has a cooling water outlet 109 for supplying cooling water.

[0082] In this embodiment, a switching component is provided on the cooling water circulation pipeline 1, which is used to selectively connect the first branch 112 or the second branch 113 according to the temperature difference ΔT between the cooling water at the cooling water outlet 109 and the waste hot water at the waste hot water inlet 108, thereby making the inlet pipeline 111, the first branch 112 and the outlet pipeline 114 conductive, or the inlet pipeline 111, the second branch 113 and the outlet pipeline 114 conductive.

[0083] Specifically, in this embodiment, the on-off component includes at least two control valves, wherein at least one control valve is arranged on the first branch 112 to control the on-off of the first branch 112; at least one control valve is arranged on the second branch 113 to control the on-off of the second branch 113.

[0084] See also Figure 1 In the present embodiment, preferably, three control valves are provided, namely, a first control valve 107, a second control valve 105 and a third control valve 106, wherein the first control valve 107 is provided on the first branch 112, and the second control valve 105 and the third control valve 106 are provided on the second branch 113. Thus, by providing two control valves on the second branch 113, when the waste hot water flows through the first branch 112, it is possible to prevent the waste hot water from flowing into the first heat pump mechanism 100 in a forward or reverse direction.

[0085] In this embodiment, the control valve can be a throttle valve, which controls the opening of the first branch 112 and the second branch 113 by controlling the opening of the throttle valve; it can also be an on-off valve, which controls the opening of the first branch 112 and the second branch 113 by controlling the opening of the on-off valve.

[0086] In this embodiment, the first control valve 107, the second control valve 105 and the third control valve 106 are solenoid valves or electric valves, which can automatically adjust the opening and closing and the degree of opening and closing of each control valve by setting conditions, thereby automatically adjusting the flow rate and flow path of the waste hot water, and then adjusting whether the waste hot water passes through the first heat pump mechanism 100.

[0087] For example, in this embodiment, the opening and closing of the first control valve 107 , the second control valve 105 and the third control valve 106 are mainly controlled according to the temperature difference ΔT between the cooling water at the cooling water outlet 109 and the waste water at the waste water inlet 108 .

[0088] For example, see Figure 3 and Figure 4When the temperature difference ΔT between the cooling water and the waste hot water is too large or too small, the heat of the waste hot water and the heat generated by the work of the second heat pump mechanism 200 are much higher or lower than the heat demand of the subsequent process, and the first heat pump mechanism 100 is required to absorb or release heat from the waste hot water. In this case, the first control valve 107 is controlled to be disconnected, and the second control valve 105 and the third control valve 106 are controlled to be closed.

[0089] The temperature difference ΔT between the cooling water and the waste water is too large or too small, which can be understood as ΔT being smaller than the first temperature value T1 or ΔT being larger than the second temperature value T2.

[0090] For example, see Figure 2 When the temperature difference ΔT between the cooling water and the waste hot water is moderate, the heat of the waste hot water and the heat generated by the work of the second heat pump mechanism 200 just meet the heat demand of the subsequent process. In this case, there is no need for the first heat pump mechanism 100 to adjust the temperature of the waste hot water. The first control valve 107 is controlled to be closed, and the second control valve 105 and the third control valve 106 are disconnected.

[0091] The temperature difference ΔT between the cooling water and the waste water is moderate, which can be understood as ΔT being greater than the first temperature value T1 and less than the second temperature value T2.

[0092] Based on this, in this embodiment, the closing condition of the first control valve 107 is that the temperature difference ΔT between the cooling water and the waste hot water is greater than the first temperature value T1 and less than the second temperature value T2; the closing condition of the second control valve 105 and the third control valve 106 is that ΔT is less than the first temperature value T1 or ΔT is greater than the second temperature value T2.

[0093] It should be understood that the first temperature value T1 and the second temperature value T2 can be set according to actual application scenarios to meet the heat demand of the heat source utilization unit connected to the rear end of the second heat pump mechanism 200.

[0094] See also Figure 1 In this embodiment, the heat pump unit includes a first heat pump mechanism 100 and a second heat pump mechanism 200, wherein the first heat pump mechanism 100 is arranged on the second branch 113, and is used to absorb heat or release heat from the waste hot water to adjust the temperature of the waste hot water; the second heat pump mechanism 200 is arranged on the outlet pipeline 114, and is used to absorb the heat of the waste hot water for reuse, and cool the waste hot water into cooling water.

[0095] Specifically, in this embodiment, the first heat pump mechanism 100 and the second heat pump mechanism 200 can both be air source heat pumps, which have the advantages of energy saving, stable performance, and long service life, and can provide a stable heat source and cooling water for the brewing process.

[0096] For example, in this embodiment, the first heat pump mechanism 100 is a carbon dioxide heat pump, and the refrigerant of the second heat pump mechanism 200 is R134A refrigerant. In this way, since carbon dioxide is an environmentally friendly working fluid, it will not produce ozone depleting substances, and has little pollution to the environment, and carbon dioxide has a higher critical temperature and critical pressure, and is suitable for refrigeration applications in a wide temperature range, and has a better application effect, while R134A refrigerant is a high-temperature working fluid, and has a better heating and heating effect.

[0097] In this embodiment, the first heat pump mechanism 100 and the second heat pump mechanism 200 are two independent circulation systems. For example, Figure 1 The first heat pump mechanism 100 is a single-stage heat pump mechanism, and the second heat pump mechanism 200 is also a single-stage heat pump mechanism. In this way, the first heat pump mechanism 100 and the second heat pump mechanism 200 are independent of each other and do not interfere with each other, which can ensure the operation stability of the heat pump unit, and the overall maintenance cost of the heat pump unit is low, and the operation cost is relatively low.

[0098] Specifically, see Figure 1 In this embodiment, the first heat pump mechanism 100 includes a carbon dioxide circulation evaporator 101, a carbon dioxide circulation compressor 102, a carbon dioxide circulation condenser 103 and a carbon dioxide circulation throttling device 104, wherein the carbon dioxide circulation evaporator 101, the carbon dioxide circulation compressor 102, the carbon dioxide circulation condenser 103 and the carbon dioxide circulation throttling device 104 are sequentially connected in series through pipelines to form a closed heat pump circulation system. The second branch 113 is connected to the carbon dioxide circulation condenser 103.

[0099] It should be understood that the first heat pump mechanism 100 also includes conventional components such as a four-way reversing valve and a filter, which are mature conventional technologies in the field and will not be described in detail in this embodiment.

[0100] In this embodiment, the first heat pump mechanism 100 has two operating modes:

[0101] 1. When the temperature difference ΔT between the cooling water and the waste water is greater than T2, the working principle of the first heat pump mechanism 100 is:

[0102] See also Figure 3The high-pressure steam discharged from the carbon dioxide circulation compressor 102 enters the carbon dioxide circulation evaporator 101. At this time, the function of the carbon dioxide circulation evaporator 101 is equivalent to that of a condenser. The refrigerant vapor is condensed into liquid by the carbon dioxide circulation evaporator 101 and enters the carbon dioxide circulation condenser 103 through the carbon dioxide circulation throttling device 104. At this time, the function of the carbon dioxide circulation condenser 103 is equivalent to that of an evaporator. The refrigerant absorbs the heat of the waste hot water in the second branch 113 in the carbon dioxide circulation condenser 103 to cool the waste hot water. The evaporated refrigerant vapor is sucked into the carbon dioxide circulation compressor 102 for circulation.

[0103] In the above process, the waste hot water is cooled by the first heat pump mechanism 100, so that the heat absorbed by the waste hot water when the second heat pump mechanism 200 cools the waste hot water to a specified temperature and the heat generated by its own work just meet the heat demand of subsequent processes, thereby avoiding overheating.

[0104] 2. When the temperature difference ΔT between the cooling water and the waste water is less than T1, the working principle of the first heat pump mechanism 100 is:

[0105] See also Figure 4 The carbon dioxide circulation compressor 102 discharges high-temperature and high-pressure gas, which enters the carbon dioxide circulation condenser 103, and exchanges heat with the waste hot water flowing through the carbon dioxide circulation condenser 103, cooling the high-temperature and high-pressure carbon dioxide gas into a low-temperature and low-pressure liquid. The heat released by the high-temperature and high-pressure carbon dioxide gas is absorbed by the waste hot water, thereby increasing the temperature of the waste hot water. The liquid is depressurized by the carbon dioxide circulation throttling device 104, and evaporates and absorbs heat in the carbon dioxide circulation evaporator 101 to form a low-temperature and low-pressure gas, which is sucked into the carbon dioxide circulation compressor 102 for circulation.

[0106] In the above process, the waste hot water is heated by the first heat pump mechanism 100, so that when the second heat pump mechanism 200 cools the waste hot water to a specified temperature, the heat absorbed by the waste hot water and the heat generated by its own work just meet the heat demand of subsequent processes, thereby avoiding the occurrence of insufficient heat.

[0107] In this embodiment, the second heat pump mechanism 200 includes a heat absorbing end and a heat releasing end. The heat absorbing end is used to absorb the heat of the waste hot water in the outlet pipe 114, and the heat releasing end reuses the heat absorbed by the heat absorbing end. In this way, the waste heat can be reused again, and the waste hot water can be cooled to cooling water, so as to realize the recycling of cooling water and achieve the purpose of energy saving.

[0108] Specifically, see Figure 1The second heat pump mechanism 200 includes a high-temperature working medium circulation evaporator 201, a high-temperature working medium circulation compressor 202, a high-temperature working medium circulation condenser 204, and a high-temperature working medium circulation throttling device 203, wherein the high-temperature working medium circulation evaporator 201, the high-temperature working medium circulation compressor 202, the high-temperature working medium circulation condenser 204, and the high-temperature working medium circulation throttling device 203 are connected in series through pipelines to form a closed heat pump circulation system. The high-temperature working medium circulation evaporator 201 is connected to the outlet pipeline 114, the high-temperature working medium circulation evaporator 201 is the heat absorption end of the second heat pump mechanism 200, and the high-temperature working medium circulation condenser 204 is the heat release end of the second heat pump mechanism 200.

[0109] Based on the above structural design, see Figure 2 The working principle of the high-temperature working fluid circulation system is as follows: the high-temperature working fluid circulation evaporator 201 performs heat exchange with the waste hot water, the refrigerant in the high-temperature working fluid circulation evaporator 201 absorbs the heat in the waste hot water and enters the high-temperature working fluid circulation compressor 202, the high-temperature working fluid circulation compressor 202 compresses it into a high-temperature and high-pressure gas, and then the high-temperature and high-pressure gas enters the high-temperature working fluid circulation condenser 204, and the high-temperature working fluid circulation condenser 204 is used to provide a heat source to subsequent units that require a heat source (such as the steam manufacturing unit described below).

[0110] In the above circulation process, since the waste hot water provides a certain amount of heat for the refrigerant, the waste heat can be reused twice, so a certain amount of energy can be saved during compression, which can achieve the purpose of saving energy consumption. At the same time, since the waste hot water exchanges heat with the refrigerant, the temperature of the waste hot water is reduced to form cooling water, which can provide cooling water for the brewing system and realize the recycling of cooling water.

[0111] It should be understood that the second heat pump mechanism 200 also includes conventional components such as a four-way reversing valve and a filter, which are mature conventional technologies in the field and will not be described in detail in this embodiment.

[0112] like Figure 5 The figure shows the theoretical cycle pressure-enthalpy diagram of the heat pump unit. The thermodynamic cycle on the carbon dioxide side is 1-2-5-6-7-8-3-4-1; the thermodynamic cycle on the R134a side is 5-6-7-8-5.

[0113] In this way, the heat pump unit is decomposed into two stages. The low-pressure stage uses carbon dioxide to raise or lower the temperature of the waste hot water, and the high-pressure stage uses R134a to provide heat, so that the heat pump unit can operate efficiently, solving the problem of excessive load on a single heat pump mechanism. The pressure ratio of the cycle is greatly reduced, reducing the total compression loss and throttling loss, thereby improving the energy efficiency of the heat pump unit.

[0114] For example, in the steam preparation process, using a two-stage heat pump, the overall COP can reach 3.1. In terms of steam preparation efficiency, it saves 69% energy compared to electric boilers and 72% energy compared to gas boilers. Compared with gas boilers and coal-fired boilers, its benefits are even more obvious.

[0115] In this embodiment, the second heat pump mechanism 200 is also connected to a heat source utilization unit. Specifically in the brewing process, the heat source utilization unit can be a steam manufacturing unit. The second heat pump mechanism 200 provides a heat source for the steam manufacturing unit to prepare steam, thereby providing a heat source for the distillation process in the brewing process.

[0116] For example, in a specific example, when the heat supply of the second heat pump mechanism 200 is used to prepare steam, the first temperature value T1 may be 4-7°C, and the second temperature value T2 may be 12-17°C. The following takes T1 as 7°C and T2 as 17°C as an example to illustrate the operating principle of the heat pump unit:

[0117] When the temperature difference ΔT is less than 7°C, the second heat pump mechanism 200 cools the waste water to the required temperature T for cooling water. 冷 When the heat Q1 absorbed by the waste hot water and the heat Q2 generated by the second heat pump mechanism 200 itself cannot meet the energy Q3 required for producing steam, the waste hot water needs to be heated by the first heat pump mechanism 100.

[0118] When the temperature difference ΔT is greater than 17°C, the second heat pump mechanism 200 cools the waste water to the required temperature T for cooling water. 冷 When the heat Q1 absorbed by the waste hot water and the heat Q2 generated by the work of the second heat pump mechanism 200 are much greater than the energy Q3 required to produce steam, the waste hot water needs to be cooled by the first heat pump mechanism 100.

[0119] When the temperature difference ΔT is greater than 7°C and less than 17°C, the second heat pump mechanism 200 cools the waste water to the required temperature T for cooling water. 冷 When the heat Q1 of the waste hot water absorbed and the heat Q2 generated by the work of the second heat pump mechanism 200 just meet the energy Q3 required for producing steam, there is no need to start the first heat pump mechanism 100.

[0120] Of course, in other embodiments, the second heat pump mechanism 200 may also be applied to other usage scenarios. For example, the second heat pump mechanism 200 may be used for heating, drying, hot water, etc.

[0121] Embodiment 2

[0122] The difference between this embodiment and the first embodiment is that in this embodiment, the refrigerant of the first heat pump mechanism 100 is carbon dioxide, and the refrigerant of the second heat pump mechanism 200 is R407C refrigerant, R410 refrigerant, R245fa refrigerant or other refrigerant suitable for high temperature heat pumps.

[0123] Using carbon dioxide as the refrigerant can ensure the stability of the first heat pump mechanism 100 and cause less pollution to the environment; and refrigerants such as R407C refrigerant, R410 refrigerant, R245fa refrigerant and R134a refrigerant are high-temperature working fluids and are suitable for high-temperature heat pumps, making the heating and heating effects of the second heat pump mechanism 100 better.

[0124] In this way, the low-temperature working fluid is used to dynamically adjust the temperature of the waste hot water, and the high-temperature working fluid is used to output high heat, thus solving the problem of low overall operating efficiency of the heat pump unit.

[0125] Embodiment 3

[0126] The difference between this embodiment and the first embodiment is that in this embodiment, the refrigerant of the first heat pump mechanism 100 is R22 refrigerant, and the refrigerant of the second heat pump mechanism 200 is R134a refrigerant, R407C refrigerant, R410 refrigerant, R245fa refrigerant or other refrigerant suitable for high temperature heat pumps.

[0127] R22 refrigerant is a conventional refrigerant for heat pump air conditioners. It has high refrigeration efficiency and is cheap, and can ensure the stability of the first heat pump mechanism 100. R407C refrigerant, R410 refrigerant, R245fa refrigerant and other refrigerants are high-temperature working fluids like R134a refrigerant, and are suitable for high-temperature heat pumps, making the heating and heating effects of the second heat pump mechanism 100 better.

[0128] Similarly, this embodiment uses low-temperature working fluid to dynamically adjust the temperature of waste hot water, and uses high-temperature working fluid to output high heat, thereby solving the problem of low overall operating efficiency of the heat pump unit.

[0129] Embodiment 4

[0130] The difference between this embodiment and the first embodiment is that in this embodiment, the second heat pump mechanism 200 is a carbon dioxide cascade heat pump mechanism, which is composed of two sets of single-stage heat pump mechanisms stacked together, see Figure 6 , which has a first heat circulation loop for heat exchange with the outlet pipe 114 and a second heat circulation loop for heat exchange with the first heat circulation loop. The refrigerant of the first heat circulation loop is R744 refrigerant, and the refrigerant of the second heat circulation loop is R134a refrigerant, R407C refrigerant, R410 refrigerant, or R245fa refrigerant.

[0131] Compared with the single-stage heat pump mechanism, the cascade heat pump mechanism is more efficient and energy-saving, has a wider range of applications, and can better meet the heating and heating needs of subsequent units. For example, in the steam preparation process, its nominal heating COP is not less than 2.1, and under the condition of an ambient temperature of 25°C, its COP is not less than 3.2, with significant energy-saving effects.

[0132] Embodiment 5

[0133] The difference between this embodiment and the first embodiment is that in this embodiment, the first heat pump mechanism 100 is a carbon dioxide cascade heat pump mechanism, which is composed of two sets of single-stage heat pump mechanisms stacked together, see Figure 7 , which has a third heat circulation loop for heat exchange with the second branch 113 and a fourth heat circulation loop for heat exchange with the third heat circulation loop. The refrigerant of the third heat circulation loop is R134a refrigerant, R407C refrigerant, R410 refrigerant, R245fa refrigerant, and the refrigerant of the fourth heat circulation loop is R744 refrigerant.

[0134] Compared with the single-stage heat pump mechanism, the cascade heat pump mechanism is more efficient and energy-saving, has a wider range of applications, and can better heat up or cool down the waste hot water. Its nominal heating COP is about 2.9. Under the condition of ambient temperature of 25°C, its COP is not less than 3.8, and the energy-saving effect is significant.

[0135] Embodiment 6

[0136] The difference between this embodiment and the fourth and fifth embodiments is that, see Figure 8 In this embodiment, the first heat pump mechanism 100 and the second heat pump mechanism 200 are both carbon dioxide cascade heat pump mechanisms.

[0137] Embodiment 7

[0138] This embodiment discloses a steam preparation system, which includes a steam production unit and a waste heat recovery system provided in any of the above embodiments.

[0139] like Fig. 9 As shown, in this embodiment, the steam production unit includes a flash evaporator 302, a steam engine 303 and a steam tank 304, wherein the flash evaporator 302 is connected to the second heat pump mechanism 200, and the steam engine 303 and the steam tank 304 are connected downstream of the flash evaporator 302 in sequence.

[0140] In this embodiment, the flash evaporator 302 can select an existing flash tank. When the high-pressure saturated water enters the relatively low-pressure flash tank, the sudden drop in pressure causes the saturated water to become saturated water vapor and saturated water under a portion of the container pressure, thereby achieving steam preparation.

[0141] Specifically, see Fig. 9The flash evaporator 302 has a saturated water inlet, a saturated water outlet and a saturated steam outlet, wherein the saturated water inlet is connected to the water outlet of the heat release end of the second heat pump mechanism 200 (i.e., the high-temperature working medium circulation condenser 204), and the saturated water outlet is connected to the water inlet of the heat release end of the second heat pump mechanism 200 (i.e., the high-temperature working medium circulation condenser 204), so as to form a saturated water circulation pipeline between the heat release end and the flash evaporator 302; the saturated steam outlet is connected to the steam engine 303.

[0142] Based on the above structural design, when the circulating water flows through the high-temperature working medium circulation condenser 204, the high-temperature working medium circulation condenser 204 heats the circulating water through the heat generated by the work of the high-temperature working medium circulation compressor 202 and the heat of the waste hot water absorbed by the high-temperature working medium circulation evaporator 201, so that the circulating water forms high-pressure saturated water. For example, the circulating water is heated to high-pressure saturated water above 100 degrees. In this process, the waste heat of the waste hot water is utilized to achieve the purpose of energy saving. Then, the high-pressure saturated water enters the flash evaporator 302, and boils and vaporizes rapidly due to the pressure change, turning into saturated water vapor and saturated water, wherein the water vapor enters the steam engine 303 through the saturated steam outlet, and the saturated water circulates to the high-temperature working medium circulation condenser 204 through the saturated water outlet, and is circulated and heated, thereby reducing the waste of water resources.

[0143] See also Fig. 9 In some embodiments, a water replenishment end 305 is connected between the saturated water outlet of the flash evaporator 302 and the water inlet of the heat release end. The water replenishment end 305 is used to replenish the circulating water in the saturated water circulation pipeline to ensure the continuous output of water vapor. In this embodiment, the water replenishment end 305 can be a water storage device such as a bucket or a water tank, which is connected to the saturated water circulation pipeline through a water pipe to continuously replenish the circulating water for the saturated water circulation pipeline. The circulating water can be soft water, which can reduce the formation of scale and extend the life of the equipment.

[0144] For further information, see Fig. 9 In this embodiment, a circulation pump 301 is further provided between the saturated water outlet of the flash evaporator 302 and the water inlet of the heat release end. The circulation pump 301 provides power for the circulating water to ensure the stable circulation of the circulating water.

[0145] In this embodiment, the inlet of the steam engine 303 is connected to the saturated steam outlet of the flash evaporator 302. The steam engine 303 is used to heat the steam supplied by the flash evaporator 302 so that the steam temperature meets the production requirements. For example, in the brewing process, it is necessary to heat the 100°C water vapor to 120°C so that the steam temperature meets the production requirements of brewing distillation. In this embodiment, the steam engine 303 can select an existing steam generator.

[0146] See also Fig. 9In this embodiment, the steam tank 304 is connected to the steam engine 303. The steam tank 304 is used to store saturated steam and ensure the temperature and pressure of the saturated steam so that the steam meets the use requirements. For example, in the brewing process, the steam tank 304 can be used to ensure that the saturated water vapor is 120°C and the pressure is 0.2MPa. If production requires, saturated water vapor can be provided according to the set instantaneous flow rate. The steam tank 304 is connected to a pipeline, and a steam outlet 110 is provided at one end of the pipeline away from the steam tank 304. When steam is needed, it can be connected to the steam outlet 110 through a pipeline to guide the steam to the required occasion for use.

[0147] Embodiment 8

[0148] This embodiment discloses a wine-making system, which includes a steam preparation system and a wine-making structure, wherein the steam preparation system selects the steam preparation system provided in the above-mentioned embodiment five.

[0149] See also Fig.10 In this embodiment, the wine making mechanism includes a wine retort 401 , an ice tank 402 and a wine barrel 403 .

[0150] In this embodiment, the wine retort 401 is a device used for wine distillation in the winemaking process. For example, the wine retort 401 can be made of an existing stainless steel retort barrel, which is a mature conventional technology in the field and will not be described in detail here.

[0151] See also Fig.10 In this embodiment, the wine retort 401 is connected to the steam outlet 110 of the steam preparation system. The steam preparation system provides saturated steam to the wine retort 401. The saturated steam heats and distills the mash in the wine retort 401, so that the alcohol in the mash evaporates to form wine vapor, which is output to the ice tank 402, thereby collecting the wine vapor.

[0152] In this embodiment, the ice tank 402 is used to cool the wine vapor to condense the wine vapor into liquid alcohol. Fig.10 The ice cylinder 402 has a wine vapor inlet and an alcohol outlet, wherein the wine vapor inlet of the ice cylinder 402 is connected to the wine retort 401 for introducing wine vapor, and the alcohol outlet is connected to the wine barrel 403 for outputting alcohol.

[0153] In this embodiment, a cooling circulation pipeline 5 is provided in the ice cylinder 402, and the cooling circulation pipeline 5 is used to circulate the cooling medium so as to exchange heat with the wine vapor in the ice cylinder 402. The cooling circulation pipeline 5 can be a coil, which is arranged in the ice cylinder 402 in a spiral manner, so as to have a better heat exchange effect with the wine vapor.

[0154] Specifically, see Fig.10In this embodiment, the cooling circulation pipeline 5 includes a high-temperature water outlet 501 and a low-temperature water inlet 502. The low-temperature water inlet 502 is used to introduce cooling water into the ice cylinder 402, and the high-temperature water outlet 501 is used to discharge the high-temperature water after heat exchange with the wine vapor.

[0155] For example, see Fig.10 In one example, the low-temperature water inlet 502 of the cooling circulation pipeline 5 is connected to the outlet pipeline 114 of the cooling water circulation pipeline 1 through a pipeline, and the high-temperature water outlet 501 is connected to the inlet pipeline 111 of the cooling water circulation pipeline 1.

[0156] In this way, when in use, the cooling water cooled by the second heat pump mechanism 200 enters the ice cylinder 402 through the low-temperature water inlet 502 to exchange heat with the wine vapor, so that the wine vapor in the ice cylinder 402 is condensed into liquid alcohol, and the cooling water becomes high-temperature water (waste water) and is discharged from the high-temperature water outlet 501 and enters the cooling water circulation pipeline 1. The first heat pump mechanism 100 and / or the second heat pump mechanism 200 are used to reuse the heat of the high-temperature water, so that the heat in the ice cylinder 402 enters the heat pump unit in the form of waste heat, thereby realizing the recycling of the heat of the ice cylinder 402.

[0157] In this embodiment, the wine barrel 403 is connected to the ice tank 402 through a pipeline for storing alcohol. Specifically, the wine barrel 403 is a storage container, which can be selected from existing ceramic barrels, oak barrels, tile jars and other containers suitable for storing alcohol.

[0158] Embodiment 9

[0159] The difference between this embodiment and the eighth embodiment is that, see Fig.11 In this embodiment, a heat exchange mechanism 404 is further provided between the cooling water circulation pipeline 1 and the cooling circulation pipeline 5 .

[0160] It should be understood that the direct connection between the cooling circulation pipeline 5 and the cooling water circulation pipeline 1 will result in a longer flow path of the cooling water and the waste hot water in the pipeline. This process will inevitably cause heat loss. Generally speaking, in a closed factory building, the heat loss is small and the waste heat utilization rate of the ice cylinder 402 can be guaranteed; however, in an open factory building, the heat loss is large, which can easily lead to a low waste heat utilization rate of the ice cylinder 402.

[0161] Based on this, in this embodiment, the cooling water in the cooling water circulation pipeline 1 is exchanged with the high-temperature water in the cooling circulation pipeline 5 through the heat exchange mechanism 404, so that the waste heat of the ice cylinder 402 can be reused, which can reduce the heat loss during the flow of high-temperature water (waste water) and improve the waste heat utilization rate of the ice cylinder 402.

[0162] See also Fig.11In this example, the heat exchange mechanism 404 is a plate heat exchanger, which includes a first inlet, a first outlet, a second inlet and a second outlet. The first inlet and the first outlet are connected through an internal pipeline, and the second inlet and the second outlet are connected through an internal pipeline. The low-temperature water inlet 502 of the ice cylinder 402 is connected to the first outlet, and the high-temperature water outlet 501 is connected to the first inlet. The inlet pipeline 111 of the cooling water circulation pipeline 1 is connected to the second outlet, and the outlet pipeline 114 is connected to the second inlet. In this way, the cooling circulation pipeline 5 and the cooling water circulation pipeline 1 form two independent water circulation systems, which can reduce the flow path of high-temperature water, reduce heat loss, and improve the waste heat utilization rate of the ice cylinder 402.

[0163] Of course, in other embodiments, the heat exchange mechanism 404 may also be a tubular heat exchanger, a closed cooling tower, etc.

[0164] Reference Fig.12 In the specific wine distillation, the main operating steps are as follows:

[0165] S31, start production, turn on the power, turn on the heat pump unit, produce saturated water and cooling water, and the cooling water enters the plate heat exchanger 404;

[0166] S32, start the circulation pump 301, so that the soft water is heated by the high-temperature working medium circulation condenser 204 to form saturated water;

[0167] S33, start the steam engine 303, the saturated water vapor in the flash evaporator 302 is heated by the steam engine 303, and the steam with higher temperature is produced and enters the steam tank 304;

[0168] S34, steam enters the wine retort 401 from the steam tank 304, heats and distills the mash in the wine retort 401, and the steam containing alcohol enters the ice tank 402;

[0169] S35, the ice tank 402 and the plate heat exchanger 404 exchange heat, the ice tank 402 cools down, the alcohol is liquefied and enters the wine barrel 403, the plate heat exchanger 404 heats up and exchanges heat, generating waste heat, which enters the heat pump unit;

[0170] S36, the waste heat reaches the high-temperature working medium circulation evaporator 201 through the first control valve 107 to be utilized, or reaches the carbon dioxide circulation condenser 103 through the second control valve 105 to be utilized, and then reaches the high-temperature working medium circulation evaporator 201 through the third control valve 106 to be utilized for preparing high-temperature steam;

[0171] S37, start repeating step S31.

[0172] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0173] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A waste heat recovery system, characterized in that: include: A cooling water circulation pipeline (1), comprising an inlet pipeline (111), an outlet pipeline (114), and a first branch (112) and a second branch (113) connected between the inlet pipeline (111) and the outlet pipeline (114), wherein the first branch (112) and the second branch (113) are arranged in parallel, the inlet pipeline (111) is provided with a waste hot water inlet (108), and the outlet pipeline (114) is provided with a cooling water outlet (109); an on-off component, arranged on the first branch (112) and the second branch (113), the on-off component being used to control the selective connection of the first branch (112) or the second branch (113) according to a temperature difference ΔT between the cooling water at the cooling water outlet (109) and the waste hot water at the waste hot water inlet (108); A heat pump unit, comprising: a first heat pump mechanism (100) disposed on the second branch (113), wherein the first heat pump mechanism (100) absorbs heat from the waste hot water flowing through the second branch (113) or releases heat to the waste hot water flowing through the second branch (113) according to the temperature difference ΔT, so as to heat or cool the waste hot water; The second heat pump mechanism (200) is arranged on the outlet pipeline (114), and comprises a heat absorbing end and a heat releasing end. The heat absorbing end is used to absorb the heat of the waste hot water in the outlet pipeline (114). After the waste hot water is cooled, it becomes cooling water and is discharged from the cooling water outlet (109). The heat releasing end releases the heat absorbed by the heat absorbing end.

2. The waste heat recovery system according to claim 1, characterized in that: Under the condition that the temperature difference ΔT is less than T1 or greater than T2, the on-off component controls the first branch (112) to be disconnected and the second branch (113) to be connected, so that the waste hot water flows through the second branch (113) to exchange heat with the first heat pump mechanism (100); When the temperature difference ΔT is between T1 and T2, the on-off component controls the first branch (112) to be connected and the second branch (113) to be disconnected, so that the waste hot water flows to the second heat pump mechanism (200) through the first branch (112).

3. The waste heat recovery system according to claim 2, characterized in that: When the temperature difference ΔT is less than T1, the first heat pump mechanism (100) releases heat to the waste hot water flowing through the second branch (113) to increase the temperature of the waste hot water; When the temperature difference ΔT is greater than T2, the first heat pump mechanism (100) absorbs heat from the waste hot water flowing through the second branch (113) to cool the waste hot water.

4. The waste heat recovery system according to claim 1, characterized in that: The first heat pump mechanism (100) and the second heat pump mechanism (200) are both air source heat pumps.

5. The waste heat recovery system according to claim 1, characterized in that: The first heat pump mechanism (100) is a cascade heat pump mechanism or a single-stage heat pump mechanism, and / or the second heat pump mechanism (200) is a cascade heat pump mechanism or a single-stage heat pump mechanism.

6. The waste heat recovery system according to claim 1, characterized in that: The on-off assembly includes at least two control valves; At least one control valve is arranged on the first branch (112) and is used to control the on-off of the first branch (112); At least one control valve is arranged on the second branch (113) and is used to control the on-off of the second branch (113).

7. A steam preparation system, characterized in that: include: A waste heat recovery system as claimed in any one of claims 1 to 6; A steam production unit, the steam production unit comprising a flash evaporator (302), the flash evaporator (302) having a saturated water inlet, a saturated water outlet and a saturated steam outlet; The saturated water inlet is connected to the water outlet of the heat release end of the second heat pump mechanism (200), and the saturated water outlet is connected to the water inlet of the heat release end, so as to form a saturated water circulation pipeline between the heat release end and the flash evaporator (302); The heat releasing end is used to heat the circulating water by means of the heat generated by the second heat pump mechanism (200) itself and the heat of the waste hot water absorbed by the heat absorbing end, so that the circulating water becomes saturated water; After the saturated water enters the flash evaporator (302), it rapidly boils and vaporizes due to pressure changes, turning into water vapor and saturated water, wherein the saturated water in the flash evaporator (302) circulates from the saturated water outlet to the heat release end.

8. The steam preparation system according to claim 7, characterized in that: A circulation pump (301) and / or a water replenishment end (305) is connected between the saturated water outlet and the water inlet of the heat release end.

9. The steam preparation system according to claim 7, characterized in that: The steam production unit further comprises a steam engine (303), the saturated steam outlet of the flash evaporator (302) is connected to the inlet of the steam engine (303), and the steam engine (303) is used to heat the steam supplied by the flash evaporator (302).

10. The steam preparation system according to claim 9, characterized in that: The steam production unit further comprises a steam tank (304), wherein the steam tank (304) is used to store saturated steam and ensure the temperature and pressure of the saturated steam; the steam tank (304) is connected to the steam engine (303).

11. A wine making system, characterized in that: include: A steam preparation system as claimed in any one of claims 7 to 10; A wine retort (401) is connected to a steam production unit, and the material in the wine retort (401) is heated and distilled by steam; An ice tank (402) connected to the wine retort (401), and distilled steam enters the ice tank (402); The ice cylinder (402) exchanges heat with the cooling water in the outlet pipe (114) of the waste heat recovery system, so that the wine vapor in the ice cylinder (402) is condensed; after the cooling water exchanges heat with the ice cylinder (402), it becomes waste hot water and is introduced into the inlet pipe (111) of the waste heat recovery system.

12. The brewing system according to claim 11, characterized in that: A cooling circulation pipeline (5) is arranged in the ice cylinder (402), and the cooling circulation pipeline (5) has a high-temperature water outlet (502) and a low-temperature water inlet (501); The high-temperature water outlet (502) is connected to the inlet pipeline (111); The low-temperature water inlet (501) is connected to the outlet pipeline (114).

13. The brewing system according to claim 12, characterized in that: A heat exchange mechanism (404) is provided between the cooling circulation pipeline (5) and the cooling water circulation pipeline (1).

14. The brewing system according to claim 13, characterized in that: The heat exchange mechanism (404) has a first inlet and a first outlet connected through an internal pipeline, and a second inlet and a second outlet connected through an internal pipeline; The high-temperature water outlet (502) is connected to the first inlet, and the low-temperature water inlet (501) is connected to the first outlet; The outlet pipeline (114) is connected to the second inlet, and the inlet pipeline (111) is connected to the second outlet.

15. The brewing system according to claim 14, characterized in that: The heat exchange mechanism (404) is any one of a plate heat exchanger, a shell heat exchanger, and a closed cooling tower.

16. The brewing system according to claim 11, characterized in that: Also includes: The wine barrel (403) is connected to the ice tank (402), and the wine vapor is cooled and condensed into alcohol and then enters the wine barrel (403) for storage.

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