阅读说明：本技术 一种冷热联供的蒸汽热泵系统 (Cold and hot steam heat pump system that allies oneself with confession ) 是由 陆启亮 蒋信 陈培 陆王琳 李政 奚有山 罗哓军 施雨 杨飞 于 2021-08-25 设计创作，主要内容包括：本发明涉及热泵技术领域,具体公开了一种冷热联供的蒸汽热泵系统,包括低温热泵机组、供水管路、高温热泵机组、第三循环回路、闪蒸罐、一级水蒸气压缩机和补水管路,其中低温热泵机组包括低温热泵蒸发器、低温热泵压缩机、低温热泵冷凝器和低温热泵膨胀阀,并依次串联形成第一循环回路,高温热泵机组包括高温热泵蒸发器、高温热泵压缩机、高温热泵冷凝器和高温热泵膨胀阀,并依次串联形成第二循环回路,供水管路与低温热泵蒸发器相连,低温热泵机组和高温热泵机组通过第三循环回路相连,闪蒸罐一端与高温热泵冷凝器相连,另一端与一级水蒸气压缩机相连,补水管路与高温热泵机组中的高温热泵冷凝器相连,可以实现冷热联供,并供给用户热水和蒸汽。(The invention relates to the technical field of heat pumps, and particularly discloses a cold and heat combined supply steam heat pump system which comprises a low-temperature heat pump unit, a water supply pipeline, a high-temperature heat pump unit, a third circulation loop, a flash tank, a primary steam compressor and a water supplementing pipeline, wherein the low-temperature heat pump unit comprises a low-temperature heat pump evaporator, a low-temperature heat pump compressor, a low-temperature heat pump condenser and a low-temperature heat pump expansion valve which are sequentially connected in series to form a first circulation loop, the high-temperature heat pump unit comprises a high-temperature heat pump evaporator, a high-temperature heat pump compressor, a high-temperature heat pump condenser and a high-temperature heat pump expansion valve which are sequentially connected in series to form a second circulation loop, the water supply pipeline is connected with the low-temperature heat pump evaporator, the low-temperature heat pump unit and the high-temperature heat pump unit are connected through the third circulation loop, one end of the flash tank is connected with the high-temperature heat pump condenser, and the other end is connected with the primary steam compressor, the water supplementing pipeline is connected with a high-temperature heat pump condenser in the high-temperature heat pump unit, so that combined supply of cold and heat can be realized, and hot water and steam are supplied to users.)

1. A steam heat pump system of cold and hot confession, its characterized in that includes:

the low-temperature heat pump unit comprises a low-temperature heat pump evaporator (101), a low-temperature heat pump compressor (104), a low-temperature heat pump condenser (102) and a low-temperature heat pump expansion valve (103), wherein the low-temperature heat pump evaporator (101), the low-temperature heat pump compressor (104), the low-temperature heat pump condenser (102) and the low-temperature heat pump expansion valve (103) are sequentially connected in series to form a first circulation loop (100);

a water supply line (300), the water supply line (300) being connected to the low-temperature heat pump evaporator (101);

the high-temperature heat pump unit comprises a high-temperature heat pump evaporator (201), a high-temperature heat pump compressor (204), a high-temperature heat pump condenser (202) and a high-temperature heat pump expansion valve (203), wherein the high-temperature heat pump evaporator (201), the high-temperature heat pump compressor (204), the high-temperature heat pump condenser (202) and the high-temperature heat pump expansion valve (203) are sequentially connected in series to form a second circulation loop (200);

the first circulating pump (401), the first circulating pump (401) is arranged between the low-temperature heat pump condenser (102) and the high-temperature heat pump evaporator (201), and the low-temperature heat pump condenser (102), the first circulating pump (401) and the high-temperature heat pump evaporator (201) are sequentially connected in series to form a third circulating loop (400);

the liquid inlet of the flash tank (506) is connected with the high-temperature heat pump condenser (202) through a first connecting pipeline;

one side of the first-stage water vapor compressor (600) is connected with the flash tank (506), and the other side of the first-stage water vapor compressor (600) is connected with a steam supply pipeline (800);

the water replenishing pipeline (503), the water replenishing pipeline (503) with high temperature heat pump condenser (202) link to each other, high temperature heat pump condenser (202) can heat the water in the water replenishing pipeline (503).

2. A combined heat and cold steam heat pump system according to claim 1, further comprising a second circulation pump (501), wherein the second circulation pump (501) is disposed between the flash tank (506) and the high temperature heat pump condenser (202), the flash tank (506) and the second circulation pump (501) are connected in series in sequence to form a fourth circulation loop (500).

3. A combined heat and cold steam heat pump system according to claim 2, wherein the liquid outlet of the flash tank (506) is communicated with the high temperature heat pump condenser (202) through a second connecting line, and the second connecting line is provided with a first valve (505).

4. A combined heat and cold steam heat pump system according to claim 3, further comprising a third connecting pipeline (502) and a hot water supply pipeline, wherein one end of the third connecting pipeline (502) is connected to the first connecting pipeline, the other end is connected to the second connecting pipeline, a second valve (504) is provided on the third connecting pipeline (502), and the hot water supply pipeline is connected to the second connecting pipeline.

5. A combined heat and cold steam heat pump system according to claim 1, wherein the water supply line (300) comprises a cold water return line (303), and a third valve is provided on the cold water return line (303).

6. A combined heat and cold steam heat pump system according to claim 1 or 5, wherein the water supply line (300) comprises a first waste heat recovery line (302), the combined heat and cold steam heat pump system further comprises a first waste heat discharge line (304), the first waste heat discharge line (304) is connected to the low temperature heat pump evaporator (101), and a fourth valve is arranged on the first waste heat recovery line (302).

7. A combined heat and cold steam heat pump system as claimed in claim 1, wherein a third circulation pump (301) is provided on the water supply line (300).

8. A combined heat and heat steam heat pump system according to claim 6, further comprising a second waste heat recovery line (402) and a second waste heat discharge line (403), the second waste heat recovery line (402) and the second waste heat discharge line (403) being connected to the high temperature heat pump evaporator (201), the heat source temperature in the second waste heat recovery line (402) being higher than the heat source temperature in the first waste heat recovery line (302).

9. A combined heat and cold steam heat pump system according to claim 1, further comprising a secondary water vapor compressor (700), the secondary water vapor compressor (700) being arranged between the primary water vapor compressor (600) and the steam supply line (800).

Technical Field

The invention relates to the technical field of heat pumps, in particular to a cold and hot combined supply steam heat pump system.

Background

The heat pump system converts low-grade energy in the low-temperature heat source into high-grade energy by consuming a certain amount of electric power, and the heating power far exceeds the electric power consumed by the heat pump system in the process, so that the heat pump system is an extremely competitive energy conversion device. Along with the national demand for the development of low-carbon and green energy sources is higher and higher, the electric energy substitution is realized through the heat pump, the use of fossil fuel can be effectively reduced, the carbon emission is reduced, further the air pollution is reduced, the utilization rate of the energy sources can be improved by using the heat pump system, and therefore the heat pump system has important economic significance and environmental significance.

At present, on one hand, the heat pump machine is used for refrigerating and heating, namely, one set of heat pump machine can only realize one function of refrigerating or heating. When the heat pump machine is used for refrigerating, all heat generated at the condenser end is discharged; when the heat pump unit is used for heating, cold energy generated by the evaporator end is completely discharged, the temperature of a low-temperature heat source at the evaporator end is very low after heat exchange, most of the cold energy is directly discharged when water is used as the low-temperature heat source, the cold energy is wasted, and the system energy efficiency is lower.

On the other hand, when the existing high-temperature heat pump unit is used for heating, a low-temperature heat source with higher temperature (more than 60 ℃) is needed, so that the low-temperature heat source with lower temperature (less than 60 ℃) is wasted, and the application range of the high-temperature heat pump is limited by the condition; in addition, a large amount of medium and low pressure steam is needed to be used in industrial production, most of the existing high-temperature heat pump systems cannot directly produce steam, and industrial requirements cannot be met.

Disclosure of Invention

According to one aspect of the present invention, the present invention provides a combined cooling and heating steam heat pump system, which can use low-temperature heat sources of different temperatures, realize simultaneous cooling and heating, and provide steam and hot water to a user.

In order to achieve the purpose, the invention adopts the following technical scheme:

a combined heat and cold steam heat pump system comprising:

the low-temperature heat pump unit comprises a low-temperature heat pump evaporator, a low-temperature heat pump compressor, a low-temperature heat pump condenser and a low-temperature heat pump expansion valve, wherein the low-temperature heat pump evaporator, the low-temperature heat pump compressor, the low-temperature heat pump condenser and the low-temperature heat pump expansion valve are sequentially connected in series to form a first circulation loop;

a water supply line connected to the low-temperature heat pump evaporator;

the high-temperature heat pump unit comprises a high-temperature heat pump evaporator, a high-temperature heat pump compressor, a high-temperature heat pump condenser and a high-temperature heat pump expansion valve, wherein the high-temperature heat pump evaporator, the high-temperature heat pump compressor, the high-temperature heat pump condenser and the high-temperature heat pump expansion valve are sequentially connected in series to form a second circulation loop;

a first circulation pump disposed between the low-temperature heat pump condenser and the high-temperature heat pump evaporator, the low-temperature heat pump condenser, the first circulation pump, and the high-temperature heat pump evaporator being connected in series in sequence to form a third circulation circuit;

the liquid inlet of the flash tank is connected with the high-temperature heat pump condenser through a first connecting pipeline;

one side of the first-stage steam compressor is connected with the flash tank, and the other side of the first-stage steam compressor is connected with a steam supply pipeline;

and the water replenishing pipeline is connected with the high-temperature heat pump condenser, and the high-temperature heat pump condenser can heat water in the water replenishing pipeline.

Optionally, the system further comprises a second circulation pump, the second circulation pump is arranged between the flash tank and the high-temperature heat pump condenser, the flash tank and the second circulation pump are sequentially connected in series to form a fourth circulation loop.

Optionally, the liquid outlet of the flash tank is communicated with the high-temperature heat pump condenser through a second connecting pipeline, and a first valve is arranged on the second connecting pipeline.

Optionally, the system further comprises a third connecting pipeline and a hot water supply pipeline, one end of the third connecting pipeline is connected with the first connecting pipeline, the other end of the third connecting pipeline is connected with the second connecting pipeline, a second valve is arranged on the third connecting pipeline, and the hot water supply pipeline is connected with the second connecting pipeline.

Optionally, the water supply line includes a cooling water return line and a first waste heat recovery line, and the cooling water return line is provided with a third valve.

Optionally, the water supply line includes a first waste heat recovery line, the combined cooling and heating steam heat pump system further includes a first waste heat discharge line, the first waste heat discharge line is connected to the low-temperature heat pump evaporator, and a fourth valve is disposed on the first waste heat recovery line.

Optionally, a third circulation pump is disposed on the water supply pipeline.

Optionally, the heat pump system further comprises a second waste heat recovery pipeline and a second waste heat discharge pipeline, the second waste heat recovery pipeline and the second waste heat discharge pipeline are connected with the high-temperature heat pump evaporator, and the temperature of a heat source in the second waste heat recovery pipeline is higher than that of the heat source in the first waste heat recovery pipeline.

Optionally, the steam supply system further comprises a secondary steam compressor, and the secondary steam compressor is arranged between the primary steam compressor and the steam supply pipeline.

The invention has the beneficial effects that:

according to the invention, a set of low-temperature heat pump unit is added in the high-temperature heat pump unit, the low-temperature heat pump unit is used for absorbing heat in a low-temperature heat source with lower grade, and then the heat is transferred to the high-temperature heat pump unit, so that the application range of the heat pump system is enlarged;

the flash tank is connected with the high-temperature heat pump condenser, so that medium and low-pressure steam required by industrial production can be prepared, and if a user does not need the steam, the steam does not enter the flash tank, hot water is provided for the user, and the requirement of the user can be met to the greatest extent;

increase the water supply pipeline and link to each other with the low temperature heat pump evaporimeter, utilize the heat in the low temperature heat pump evaporimeter absorption water supply pipeline, realize refrigerating, and then realized the dual function of heat pump system refrigeration simultaneously and heating, and effectively utilized the waste heat that produces when the heat pump system refrigerates and the waste cold that produces when heating, the steam heat pump system of above-mentioned cold and hot confession utilizes its higher energy efficiency ratio, turn into higher heating power with less electric power, energy resource consumption has been reduced, thereby energy-conserving and the purpose of improving the energy utilization has been reached.

Drawings

Fig. 1 is a schematic structural view of a combined heat and cold steam heat pump system according to the present invention.

In the figure:

100. a first circulation loop; 101. a low temperature heat pump evaporator; 102. a low temperature heat pump condenser; 103. a low temperature heat pump expansion valve; 104. a low temperature heat pump compressor; 200. a second circulation loop; 201. a high temperature heat pump evaporator; 202. a high temperature heat pump condenser; 203. a high temperature heat pump expansion valve; 204. a high temperature heat pump compressor; 300. a water supply line; 301. a third circulation pump; 302. a first waste heat recovery pipeline; 303. a cooling and water return pipeline; 304. a first waste heat discharge line; 400. a third circulation loop; 401. a first circulation pump; 402. a second waste heat recovery pipeline; 403. a second waste heat discharge line; 500. a fourth circulation loop; 501. a second circulation pump; 502. a third connecting pipeline; 503. a water replenishing pipeline; 504. a second valve; 505. a first valve; 506. a flash tank; 600. a first stage steam compressor; 700. a secondary water vapor compressor; 800. a steam supply pipeline; 900. a hot water supply line.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In industrial production, some enterprises have a hot and cold process, for example, in slaughtering enterprises, cold storage is required, and high-temperature hot water is required for dehairing for use in a production line. Conventional freezer heat extraction is wasted, and hot water needs to pass through boiler preparation again, takes place a large amount of energy extravagant. At present, a high-temperature heat pump system is used for refrigerating and heating, and the same heat pump system cannot supply cold and heat for enterprises at the same time. Some enterprises need to use a large amount of medium and low pressure steam in production, such as clothing factories, and the existing high-temperature heat pump system can only provide hot water for the enterprises and cannot provide steam. In addition, the existing high-temperature heat pump system can only absorb heat in a low-temperature heat source with higher temperature (more than 60 ℃), so that the low-temperature heat source with lower temperature (less than 60 ℃) is wasted, energy conservation and emission reduction are not facilitated, and the application range of the high-temperature heat pump system is limited by the condition.

In view of the above problems, in an embodiment of the present invention, a combined cooling and heating steam heat pump system is provided, as shown in fig. 1, the combined cooling and heating steam heat pump system includes a low temperature heat pump unit, a water supply pipeline 300, a third circulation loop 400, a high temperature heat pump unit, a flash tank 506, a first stage steam compressor 600, and a water replenishing pipeline 503, the water supply pipeline 300 supplies a low temperature heat source to the low temperature heat pump unit, the low temperature heat pump unit absorbs heat of the low temperature heat source in the water supply pipeline 300, the temperature of water in the water supply pipeline 300 decreases to become chilled water for refrigeration, a heat exchange medium in the low temperature heat pump unit absorbs heat and exchanges heat with water in the third circulation loop 400 to heat water in the third circulation loop 400, the third circulation loop 400 is provided with a first circulation pump 401, the hot water in the third circulation loop 400 is supplied to the high temperature heat pump unit through the first circulation pump 401, the high-temperature heat pump unit heats water in the water replenishing pipeline 503 after absorbing heat in the third circulation loop 400, the water in the water replenishing pipeline 503 is in an overheated state after being heated, the water enters the flash tank 506 for flash evaporation, the back pressure of the flash tank 506 is atmospheric pressure, hot water is quickly overheated and boiled to be subjected to flash evaporation to become steam, and the steam is compressed by the primary steam compressor 600 to reach the pressure and temperature required by a user for the user to use.

The low-temperature heat pump unit is composed of a low-temperature heat pump evaporator 101, a low-temperature heat pump compressor 104, a low-temperature heat pump condenser 102 and a low-temperature heat pump expansion valve 103, the low-temperature heat pump evaporator 101, the low-temperature heat pump compressor 104, the low-temperature heat pump condenser 102 and the low-temperature heat pump expansion valve 103 are sequentially connected in series to form a first circulation loop 100, the low-temperature heat pump evaporator 101 is used for absorbing heat of an external heat source, then the heat is compressed by the low-temperature heat pump compressor 104, the temperature of working media in the first circulation loop 100 is increased, the low-temperature heat pump condenser 102 releases the heat of the working media in the first circulation loop 100, the working media are subjected to pressure reduction by the low-temperature heat pump expansion valve 103 and then flow back to the low-temperature heat pump evaporator 101, and the process is performed in the low-temperature heat pump unit in a circulating mode.

The water supply pipeline 300 is connected with the low-temperature heat pump evaporator 101, a low-temperature heat source flows through the water supply pipeline 300, and after the low-temperature heat pump evaporator 101 absorbs heat energy of the low-temperature heat source in the water supply pipeline 300, water temperature in the water supply pipeline 300 is reduced for refrigeration.

The high-temperature heat pump unit is composed of a high-temperature heat pump evaporator 201, a high-temperature heat pump compressor 204, a high-temperature heat pump condenser 202 and a high-temperature heat pump expansion valve 203, the high-temperature heat pump evaporator 201, the high-temperature heat pump compressor 204, the high-temperature heat pump condenser 202 and the high-temperature heat pump expansion valve 203 are sequentially connected in series to form a second circulation loop 200, the high-temperature heat pump evaporator 201 is used for absorbing heat of an external heat source, then the high-temperature heat pump compressor 204 compresses the heat of a working medium in the second circulation loop 200, the high-temperature heat pump condenser 202 releases the heat of the working medium in the second circulation loop 200, the working medium is decompressed by the high-temperature heat pump expansion valve 203 and flows back to the high-temperature heat pump evaporator 201, and the process is performed in the high-temperature heat pump unit in a circulating mode.

The low-temperature heat pump condenser 102 and the high-temperature heat pump evaporator 201 are connected through a third circulation loop 400, the third circulation loop 400 is further connected with a first circulation pump 401 and used for providing power for water in the third circulation loop 400 and enabling the water to circularly flow along a pipeline of the third circulation loop 400, heat released by the low-temperature heat pump condenser 102 is absorbed by the water in the third circulation loop 400 and is transferred to the high-temperature heat pump evaporator 201 through the circulation effect of the first circulation pump 401, after the high-temperature heat pump evaporator 201 absorbs the heat in the third circulation loop 400, the temperature of the water in the third circulation loop 400 is reduced, the water is re-conveyed to the low-temperature heat pump condenser 102 to be heated under the effect of the first circulation pump 401, and the process is circularly carried out.

One side of the flash tank 506 is connected with the high-temperature heat pump condenser 202, and the other side is connected with the first-stage vapor compressor 600, because the pressure of the water heated by the high-temperature heat pump condenser 202 is slightly higher than the atmospheric pressure, the water temperature is the saturation temperature under the pressure, the water enters the flash tank 506 to be flashed into normal-pressure vapor, and then the normal-pressure vapor is compressed into vapor with the temperature and the pressure required by a user by the first-stage vapor compressor 600 to be used by the user.

The water replenishing pipe 503 is connected to the high temperature heat pump condenser 202, and since the water vapor supplied to the user consumes water, the water replenishing pipe 503 needs to be replenished in time, and the heat energy released by the high temperature heat pump condenser 202 heats the water in the water replenishing pipe 503 to a required temperature.

By adding a set of low-temperature heat pump units in the high-temperature heat pump system, a low-temperature heat source (less than 60 ℃) with a lower temperature can also be utilized, the application range of the heat pump system is expanded, meanwhile, the waste of heat energy can be avoided, and energy is saved; the temperature of the water after the heat is absorbed by the low-temperature heat pump evaporator 101 is reduced, and the water is used for refrigeration, so that the refrigeration and heating of the heat pump system can work simultaneously; the flash tank 506 can be used for preparing steam, so that the required steam is provided for enterprises needing medium-low pressure steam, the requirements of users are met to the greatest extent, and the experience of the users is improved.

Further, the high-temperature heat pump condenser 202 and the flash tank 506 may be sequentially connected in series to form a fourth circulation loop, the second circulation pump 501 is disposed on the fourth circulation loop 500, water heated by the high-temperature heat pump condenser 202 enters the flash tank 506 for flash evaporation, and cannot be flashed into steam, and water that is not evaporated may exist, the water that is not evaporated in the flash tank 506 is conveyed back to the high-temperature heat pump condenser 202 for reheating through the second circulation pump 501, and then enters the flash tank 506 for flash evaporation again, and the process is performed in the fourth circulation loop 500 in a circulating manner, the second circulation pump 501 may circulate hot water in the fourth circulation loop 500, and when steam is provided for a user, waste of hot water may be avoided.

Preferably, on the fourth circulation loop 500, the liquid outlet of the flash tank 506 is connected to the high-temperature heat pump condenser 202 through a second connection pipeline, a first valve 505 may be disposed on the second connection pipeline, when a user needs to provide steam, the first valve 505 is opened, the fourth circulation loop 500 is conducted, the steam flashed by the flash tank 506 enters the first-stage water vapor compressor 600, then the steam is supplied to the user through the steam supply pipeline 800, the water that is not evaporated in the flash tank 506 circulates on the fourth circulation loop 500, and is flashed again after being heated by the high-temperature heat pump condenser 202, so that waste of high-temperature hot water can be avoided, the amount of make-up water required by the make-up water pipeline 503 can be reduced, and resources can be saved.

Further, a third connecting pipeline 502 may be provided, one end of the third connecting pipeline 502 is connected to the first connecting pipeline, the other end is connected to the second connecting pipeline, a second valve 504 is provided on the third connecting pipeline 502, if the user needs the medium-low pressure steam, the second valve 504 is closed, the water heated by the high-temperature heat pump condenser 202 enters the flash tank 506 for flash evaporation, the water becomes the normal pressure steam after the flash evaporation, the water enters the first-stage water vapor compressor 600 for compression according to the requirements of the user on the steam temperature and pressure, the pressure and temperature are set, and then the water is supplied to the user through the steam supply pipeline 800; if the user needs hot water, the first valve 505 is closed, the second valve 504 is opened, the water heated by the high temperature heat pump condenser 202 enters the third connecting pipeline 502, a hot water supply pipeline can be connected to the second connecting pipeline, and the heated hot water flows into the second connecting pipeline through the third connecting pipeline 502 and is supplied to the user from the hot water supply pipeline. The design can provide double choices of hot water and steam for users, can meet different requirements of the users, and improves the experience of the users. When a user needs to provide hot water and steam, the first valve 505 can be closed, the second valve 504 is closed, the steam flashed by the flash tank 506 is provided for the user through the steam supply pipeline 800, and the water which is not evaporated in the flash tank 506 is directly provided for the user through the hot water supply pipeline, so that the dual requirements of the user on the steam and the hot water can be met at the same time.

Preferably, with continued reference to fig. 1, the water supply pipeline 300 includes a cooling water return pipeline 303, in an embodiment, return water generated in a refrigeration process is conveyed to the low-temperature heat pump evaporator 101 through the cooling water return pipeline 303, the temperature meets the requirement of cooling chilled water after heat is released in the low-temperature heat pump evaporator 101, the return water enters the refrigeration system to be refrigerated by a user, a third circulation pump 301 may be disposed on the water supply pipeline 300, and the cooling water return is recycled through the third circulation pump 301. A third valve may be provided on the cooling water return line 303, which may be closed when cooling is not required.

Further, the water supply line 300 may further include a first waste heat recovery line 302, and a first waste heat discharge line 304 may be provided to connect the first waste heat discharge line 304 with the low temperature heat pump evaporator 101, so that when waste heat with a low temperature is generated in the industrial production, the waste heat in the first waste heat recovery line 302 is used to provide heat for the low temperature heat pump evaporator 101, and the remaining heat which cannot be absorbed by the low temperature heat pump evaporator 101 may be discharged through the first waste heat discharge line 304. A fourth valve may be disposed in the first waste heat recovery pipeline 302, and when waste heat with a low temperature is generated in the industrial production, the third valve is closed, and the fourth valve is opened, so that heat is provided to the low temperature heat pump evaporator 101 by the waste heat in the first waste heat recovery pipeline 302.

As a preferred technical solution, with reference to fig. 1, a second waste heat recovery pipeline 402 and a second waste heat discharge pipeline 403 may be provided, and the second waste heat recovery pipeline 402 and the second waste heat discharge pipeline 403 are connected to the high temperature heat pump evaporator 201, when there is waste heat with a higher temperature in the industrial production, the waste heat may be directly transmitted to the high temperature heat pump evaporator 201, and the high temperature heat pump evaporator 201 directly absorbs heat, and does not need to be heated by the low temperature heat pump unit, so that electric energy may be saved, and the remaining heat that cannot be absorbed by the high temperature heat pump evaporator 201 may be discharged through the second waste heat discharge pipeline 403.

Preferably, with continued reference to fig. 1, in one embodiment, a secondary water vapor compressor 700 may be disposed between the primary water vapor compressor 600 and the steam supply pipeline 800, specifically according to the requirements of the user for water vapor pressure and temperature.

Furthermore, the water in the water replenishing pipeline 503 is softened water, which can avoid the phenomena of scale deposit in the pipeline, pipeline blockage, reduced thermal efficiency and the like, fundamentally eliminate the water and alkali, ensure the safe operation of the heat pump system, reduce the maintenance cost of water equipment and water pipelines, and improve the energy efficiency ratio of the heat pump system.

The following is illustrated with reference to specific examples:

generally speaking, a refrigeration system needs to provide chilled water at about 7 ℃, the cooling and returning water after absorbing heat is 12 ℃, the cooling and returning water enters the low-temperature heat pump evaporator 101 through the cooling and returning water pipeline 303 under the action of the third circulating pump 301, and the water temperature is reduced to 7 ℃ after releasing heat in the low-temperature heat pump evaporator 101, so that the chilled water is used for cooling.

The low-temperature heat pump evaporator 101 in the low-temperature heat pump unit absorbs heat from the cold supply return water, the heat is released through the low-temperature heat pump compressor 104 and the low-temperature heat pump condenser 102, the water in the third circulation loop 400 can be heated to more than 60 ℃ and used as a heat source of the next-stage high-temperature heat pump unit, the water enters the high-temperature heat pump evaporator 201 to release heat, the water temperature in the third circulation loop 400 is reduced to 50 ℃ after the heat is released, and the water enters the low-temperature heat pump condenser 102 to be heated through the action of the first circulation pump 401 in the third circulation loop 400, so that the circulation of the third circulation loop 400 is realized.

The high-temperature heat pump evaporator 201 in the high-temperature heat pump unit absorbs heat from the third circulation loop 400, the heat passes through the high-temperature heat pump compressor 204 and the high-temperature heat pump condenser 202, water in the water replenishing pipeline 503 can be heated to 110 ℃ due to the increase of the temperature of a heat source, the hot water is in an unsaturated state and cannot be boiled, the hot water enters the flash tank 506, the back pressure of the flash tank 506 is atmospheric pressure, the hot water is rapidly converted into an overheated state and rapidly boiled to be subjected to flash evaporation to form steam of 105 ℃ and 0.101MPa, the steam in the state is compressed by the two-stage steam compressors and subjected to adiabatic temperature rise, and steam of 160 ℃ and 0.6MPa is finally produced for users to use. Because the flash evaporation cannot be completed at one time, latent heat of vaporization needs to be absorbed in the flash evaporation process, and therefore, the remaining water is cooled and then enters the high-temperature heat pump condenser 202 for heating again, and is subjected to circular flash evaporation in the fourth circulation loop 500.

The above 160 c, 0.6MPa is a assumed value, which can be satisfied by adjusting the number and parameters of the water vapor compressors if the parameter required by the user is less than or greater than the assumed value.

The system can adjust the outlet water temperature, adjust parameters when only hot water is needed, open the third connecting pipeline 502, produce hot water with the temperature not higher than 100 ℃, and realize flexible switching of steam supply and hot water supply.

If the system has waste heat with higher temperature, the heat can be directly transmitted to the high-temperature heat pump evaporator 201 through the second waste heat recovery pipeline 402 without being heated by the low-temperature heat pump unit, and electric energy can be saved.

If the system does not need refrigeration, a low-temperature heat source with lower temperature in industrial production can be conveyed to the low-temperature heat pump evaporator 101, and water in the third circulation loop 400 is heated to more than 60 ℃ through the low-temperature heat pump unit, so that heat energy is provided for the high-temperature heat pump unit.

The combined cooling and heating steam heat pump system provided by the invention can prepare high-temperature hot water and steam by using a low-temperature heat source, greatly expands the application range of the high-temperature heat pump system, can prepare chilled water, reduces the investment of a water chilling unit, realizes combined cooling and heating, improves the overall energy efficiency ratio of the heat pump system, can adapt to heat sources with different temperatures and can be flexibly switched, and the heat pump system is ensured to operate under a higher energy efficiency ratio.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.