Compression condensing unit with waste heat recovery and precooling functions

Abstract

The utility model discloses a compression condensing unit with waste heat recovery precooling, which comprises a compression type refrigerating system, an absorption type refrigerating system and a secondary refrigerant circulating system, and the absorption type refrigerating system comprises a waste heat generator, a second condenser, a second throttle valve, a second evaporator, an absorber and a solution pump. The secondary refrigerant circulating system comprises a secondary refrigerant loop and a heat exchanger, the hot side of the second evaporator and the cold side of the heat exchanger are connected in the secondary refrigerant loop, and the hot side of the heat exchanger is connected between the compressor and the first condenser; the second evaporator transmits cold energy into the compression type refrigerant system through a secondary refrigerant in the secondary refrigerant loop and the heat exchanger, and refrigerant steam before entering the first condenser is pre-cooled. Waste heat generated in industrial production is used for driving the absorption type refrigeration system, the condenser of the compression type refrigeration system is pre-cooled through cold energy provided by absorption type refrigeration, and the energy utilization rate is effectively increased.

Description

Technical Field

[0001] The utility model relates to the fields of refrigeration and waste heat recovery, and particularly relates to a compression condensing unit with waste heat recovery and precooling. Background Art

[0002] With the increasing demand for energy, the rising energy consumption has led to great pressure on energy supply. In the field of compression refrigeration, how to improve the energy efficiency of the compression condensing unit has become an issue that cannot be ignored. Conventional steam compression refrigeration cycle units usually adopt a cooling water cycle with a cooling tower, resulting in large energy consumption. In addition, a large amount of waste heat is generated in industrial production but cannot be reasonably utilized, causing energy waste and thermal pollution problems. Thermal pollution may lead to the intensification of the urban heat island effect, affecting the comfort and health of the surrounding environment. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to a certain extent. For this purpose, an embodiment of the utility model provides a compression condensing unit with waste heat recovery and precooling, which improves the utilization efficiency of waste heat and also improves the system energy efficiency.

[0004] The compression condensing unit with waste heat recovery and precooling according to the embodiment of the utility model includes: a compression refrigeration system, which includes a compressor, a first condenser, a first throttle valve, and a first evaporator connected in sequence in the refrigerant flow direction, and the first evaporator is used for the evaporation refrigeration of the refrigerant; an absorption refrigeration system, which includes a waste heat generator, a second condenser, a second throttle valve, a second evaporator, an absorber, and a solution pump. The waste heat generator is used for heating the working medium pair of the refrigerant and the absorbent, and the waste heat generator has a refrigerant vapor outlet and an absorbent outlet. The refrigerant vapor outlet of the waste heat generator is connected to the second condenser, the second throttle valve, and the second evaporator in sequence. The second evaporator is used for the evaporation refrigeration of the refrigerant. The outlet of the second evaporator and the absorbent outlet of the waste heat generator are both communicated with the absorber. The solution pump is used for transporting the working medium pair in the absorber to the waste heat generator; a secondary refrigerant circulation system, which includes a secondary refrigerant circuit and a heat exchanger. The hot side of the second evaporator and the cold side of the heat exchanger are connected in the secondary refrigerant circuit. The hot side of the heat exchanger is connected between the compressor and the first condenser. The second evaporator transfers cold energy to the compression refrigeration system through the secondary refrigerant in the secondary refrigerant circuit and the heat exchanger, and precools the refrigerant vapor before it enters the first condenser.

[0005] In some embodiments, the compression refrigeration system includes: a heat exchange branch that is connected in parallel with the first condenser, an inlet end of the heat exchange branch is communicated with a hot side outlet of the heat exchanger, and an outlet of the heat exchange branch is communicated with an inlet of the first evaporator; a first stop valve that is arranged on the heat exchange branch; and a second stop valve that is arranged on an inlet side of the first condenser and is connected in parallel with the first stop valve.

[0006] In some embodiments, the absorption refrigeration system further includes a subcooler and a third throttle valve. A hot side of the subcooler is connected between the second condenser and the second throttle valve, a cold side of the subcooler is communicated with an outlet of the second evaporator, and the third throttle valve is connected between the second evaporator and the subcooler.

[0007] In some embodiments, the absorption refrigeration system further includes a second heat exchanger. A hot side of the second heat exchanger is connected between an absorbent outlet of the waste heat generator and an inlet of the absorber, a cold side of the second heat exchanger is communicated with an outlet of the absorber, the absorbent on the hot side of the second heat exchanger exchanges heat with a working medium pair on the cold side of the second heat exchanger, and the solution pump is connected between the outlet of the absorber and the second heat exchanger for delivering the working medium pair to the second heat exchanger.

[0008] In some embodiments, the absorption refrigeration system further includes a rectification column that is arranged above the waste heat generator for rectifying refrigerant vapor evaporated by the waste heat generator, and a top outlet of the rectification column is communicated with the second condenser.

[0009] In some embodiments, a regulating valve is further included. An outlet of the second condenser is connected to an inlet of the regulating valve, and an outlet of the regulating valve is connected to a reflux port of the rectification column.

[0010] In some embodiments, the secondary refrigerant circulation system includes a solution driving pump that is arranged in the secondary refrigerant circuit for driving the secondary refrigerant in the secondary refrigerant circuit.

[0011] In some embodiments, the absorption refrigeration system further includes a condenser accumulator that is arranged on an outlet side of the second condenser for storing the condensed liquid secondary refrigerant.

[0012] In some embodiments, the secondary refrigerant is an ethylene glycol solution.

[0013] The compression condensation unit with waste heat recovery and precooling provided by the embodiments of the present utility model utilizes the waste heat generated in industrial production to drive an absorption refrigeration system, and precools the condenser of the compression refrigeration system with the cooling capacity provided by absorption refrigeration, effectively improving the energy utilization rate. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the compression condensation unit with waste heat recovery and precooling according to the embodiments of the present utility model.

[0015] Reference Signs:

[0016] 1-1, waste heat generator; 1-2, rectifying column; 1-3, second condenser; 1-4, regulating valve; 1-5, condenser liquid reservoir; 1-6, subcooler; 1-7, second evaporator; 1-8, third throttle valve; 1-9, stop valve; 1-10, stop valve; 1-11, absorber; 1-12, second heat exchanger; 1-13, solution pump; 1-14, second throttle valve; 2-1, solution driving pump; 2-2, first heat exchanger; 2-3, first stop valve; 2-4, second stop valve; 2-5, first condenser; 2-6, first throttle valve; 2-7, first evaporator; 2-8, compressor; 2-9, coolant circuit; 2-10, heat exchange branch. Detailed Embodiments

[0017] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0018] The following is based on Figure 1 Describe the compression condensation unit with waste heat recovery and precooling provided by the present utility model. The compression condensation unit includes a compression refrigeration system, an absorption refrigeration system, and a coolant circulation system.

[0019] The compression refrigeration system includes a compressor 2-8, a first condenser 2-5, a first throttle valve 2-6, and a first evaporator 2-7 connected in sequence in the refrigerant flow direction. After being compressed by the compressor 2-8, the refrigerant in the compression refrigeration system enters the first condenser 2-5 and condenses into a liquid refrigerant. The condensed liquid refrigerant passes through the first throttle valve 2-6 for throttling and pressure reduction, and then enters the first evaporator 2-7, absorbing heat and evaporating into a refrigerant vapor to achieve the refrigeration effect.

[0020] The absorption refrigeration system includes a waste heat generator 1-1, a second condenser 1-3, a second throttle valve 1-14, a second evaporator 1-7, an absorber 1-11, and a solution pump 1-13. Optionally, the working fluid pair used in the absorption refrigeration system generally includes a high-boiling absorbent (such as lithium bromide) and a low-boiling refrigerant (such as water or ammonia).

[0021] The waste heat generator 1-1 is used to utilize waste heat to heat the working fluid pair of the refrigerant and the absorbent, so that most of the low-boiling refrigerant in the working fluid pair evaporates. The waste heat generator 1-1 has a refrigerant vapor outlet and an absorbent outlet. The refrigerant vapor outlet of the waste heat generator 1-1 is communicated with the inlet of the second condenser 1-3. The refrigerant vapor in the waste heat generator 1-1 enters the second condenser 1-3 and is condensed into liquid refrigerant by the cooling medium in the second condenser 1-3. The second throttle valve 1-14 is connected to the outlet side of the second condenser 1-3. The liquid refrigerant discharged from the second condenser 1-3 is throttled and depressurized by the second throttle valve 1-14. After throttling, the refrigerant enters the second evaporator 1-7, absorbs heat and evaporates into refrigerant vapor, achieving the refrigeration effect. The outlet of the second evaporator 1-7 is communicated with the absorber 1-11. The low-pressure refrigerant vapor discharged from the second evaporator 1-7 is discharged into the absorber 1-11. The absorbent outlet of the waste heat generator 1-1 is communicated with the absorber 1-11. The remaining solution (high-boiling absorbent and a small amount of unevaporated refrigerant) in the waste heat generator 1-1 is discharged from the absorbent outlet and enters the absorber 1-11 to be mixed with the low-pressure refrigerant vapor to form a working fluid pair. The outlet of the absorber 1-11 is communicated with the inlet of the waste heat generator 1-1. The solution pump 1-13 is connected between the absorber 1-11 and the waste heat generator 1-1 and is used to transport the working fluid pair in the absorber 1-11 into the waste heat generator 1-1, and the waste heat generator 1-1 heats the working fluid pair.

[0022] The secondary refrigerant circulation system includes a secondary refrigerant circuit 2-9 and a first heat exchanger 2-2. The secondary refrigerant circuit 2-9 is used to circulate the secondary refrigerant. The hot side of the second evaporator 1-7 and the cold side of the first heat exchanger 2-2 are connected in the secondary refrigerant circuit. The hot side of the first heat exchanger 2-2 is connected between the compressor 2-8 and the first condenser 2-5. The secondary refrigerant in the secondary refrigerant circuit 2-9 is used to transfer the cold quantity generated by the evaporation of the refrigerant in the second evaporator 1-7 to the compression refrigeration system through the first heat exchanger 2-2, and pre-cool the refrigerant vapor before entering the first condenser 2-5.

[0023] The compression condensation unit with waste heat recovery and pre-cooling provided by the embodiment of the present invention utilizes the waste heat generated in industrial production to drive the absorption refrigeration system, and pre-cools the condenser of the compression refrigeration system with the cold quantity provided by the absorption refrigeration, effectively improving the energy utilization rate.

[0024] Next, according toFigure 1 Describe the compression condensation unit with waste heat recovery and precooling in the specific embodiments of the present utility model.

[0025] As Figure 1 As shown, the compression condensation unit includes a compression refrigeration system, an absorption refrigeration system, and a secondary refrigerant circulation system. The absorption refrigeration system includes a waste heat generator 1-1, a second condenser 1-3, a second throttle valve 1-14, a second evaporator 1-7, an absorber 1-11, and a solution pump 1-13. The secondary refrigerant circulation system includes a secondary refrigerant circuit 2-9 and a first heat exchanger 2-2. The compression refrigeration system includes a compressor 2-8, a first condenser 2-5, a first throttle valve 2-6, and a first evaporator 2-7.

[0026] The absorption refrigeration system further includes a rectifying column 1-2, which is used to rectify the refrigerant vapor evaporated by the waste heat generator 1-1. The low-concentration refrigerant vapor evaporated by the waste heat generator 1-1 is rectified by the rectifying column 1-2 to obtain high-concentration refrigerant vapor. The high-concentration refrigerant vapor obtained by rectification is discharged from the top of the rectifying column 1-2 and enters the second condenser 1-3.

[0027] The absorption refrigeration system further includes a condenser liquid reservoir 1-5, which is arranged on the outlet side of the second condenser 1-3 and is used to store the liquid refrigerant discharged from the outlet of the second condenser 1-3.

[0028] The liquid refrigerant outlet of the second condenser 1-3 is also connected to a regulating valve 1-4, and the outlet of the regulating valve 1-4 is connected to the reflux port of the rectifying column 1-2. In this embodiment, the reflux mode of the rectifying column adopts external condensation reflux, and the regulating valve 1-4 is used to adjust the reflux flow rate or reflux ratio of the external liquid refrigerant, so as to ensure that refrigerant vapor with a stable concentration is obtained at the top of the rectifying column 1-2.

[0029] As Figure 1 As shown, the absorption refrigeration system further includes a subcooler 1-6. The hot side of the subcooler 1-6 is connected between the condenser liquid reservoir 1-5 and the second throttle valve 1-14, and the cold side of the subcooler 1-7 is connected between the second evaporator 1-7 and the absorber 1-11. Before throttling, the liquid refrigerant discharged from the condenser liquid reservoir 1-5 flows through the hot side of the subcooler 1-6 to absorb the cold of the refrigerant vapor on the cold side of the subcooler 1-6, and this part of the cold is recovered to further improve the energy utilization rate.

[0030] A third throttle valve 1-8 is provided between the outlet of the second evaporator 1-7 and the subcooler 1-6. The refrigerant vapor discharged from the outlet of the second evaporator 1-7 is throttled and depressurized by the third throttle valve 1-8 before entering the subcooler 1-6.

[0031] As Figure 1As shown in the figure, the absorption refrigeration system further includes a second heat exchanger 1-12. In the second heat exchanger 1-12, the absorbent discharged from the absorbent outlet of the waste heat generator 1-1 exchanges heat with the working pair discharged from the absorber 1-11, the temperature of the working pair increases, and the working pair entering the rectification column 1-2 is preheated. Specifically, the hot side of the second heat exchanger 1-12 is connected between the absorbent outlet of the waste heat generator 1-1 and the inlet of the absorber 1-11, and the temperature of the absorbent after heat exchange decreases. The cold side of the second heat exchanger 1-12 is communicated with the outlet of the absorber 1-11, and the temperature of the working pair after heat exchange increases. In this embodiment, the cold side outlet of the second heat exchanger 1-12 is connected to the middle of the rectification column 1-2, and the working pair after heat exchange enters the rectification column 1-2 and sprays downward, and is heated by the waste heat generator 1-1 at the bottom.

[0032] The absorber 1-11 is connected with a cooling water inlet pipe stop valve 1-9 and a cooling water return pipe stop valve 1-10. A large amount of heat is generated when the absorber 1-11 absorbs the refrigerant vapor. Cooling water is required to discharge the heat generated during the absorption process through heat exchange to maintain a stable absorption temperature inside the absorber 1-11.

[0033] Preferably, ammonia and water are used as the working pair, which has a wide refrigeration range and can also achieve stepless adjustment.

[0034] The operation process of the absorption refrigeration system is as follows: The working pair flowing into the waste heat generator 1-1 is heated by using waste heat, so that most of the low-boiling refrigerants in the working pair evaporate; then, high-concentration refrigerant vapor is rectified by the rectification column 1-2, and the refrigerant vapor enters the second condenser 1-3 and is condensed into liquid refrigerant by the cooling medium. The liquid refrigerant can be stored in the condenser liquid storage tank 1-5; the liquid refrigerant enters the hot side of the subcooler 1-6, absorbs the cold quantity of the cold side of the subcooler 1-6, and then is depressurized to the evaporation pressure by the second throttle valve 1-14 and enters the second evaporator 1-7 to absorb external heat and vaporize into steam; a large amount of cold quantity can be provided to the secondary refrigerant circulation system during the vaporization process of the refrigerant in the second evaporator 1-7, and this part of the cold quantity is transported to the compression refrigeration system through the secondary refrigerant in the secondary refrigerant circulation system for precooling; the refrigerant vapor discharged from the second evaporator 1-7 is throttled by the third throttle valve 1-8 and then enters the cold side of the subcooler 1-6 to exchange heat with the refrigerant on the hot side, and the refrigerant vapor after heat exchange is discharged from the cold side of the subcooler 1-6 and enters the absorber 1-11; the unevaporated absorbent discharged from the bottom of the waste heat generator 1-1 enters the absorber 1-11 after heat exchange in the second heat exchanger 1-12 and is mixed with the refrigerant vapor to form a working pair; the working pair is discharged from the absorber 1-11, input into the second heat exchanger 1-12 by the solution pump 1-13, and after heat exchange, is input into the rectification column 1-2 and sprays downward, and is heated again by the waste heat generator 1-1 at the bottom.

[0035] The secondary refrigerant circulation system further includes a solution driving pump 2-1, which is arranged in the secondary refrigerant circuit 2-9 and is used to drive the circulation of the secondary refrigerant in the secondary refrigerant circuit 2-9.

[0036] In Figure 1 the illustrated embodiment, the solution driving pump 2-1 is located at the hot side inlet of the second evaporator 1-7. The secondary refrigerant carrying cold discharged from the hot side outlet of the second evaporator 1-7 is input into the cold side of the first heat exchanger 2-2. In the first heat exchanger 2-2, the secondary refrigerant on the cold side exchanges heat with the refrigerant on the hot side, transfers the cold to the refrigerant, and precools the refrigerant. The secondary refrigerant after heat exchange is discharged from the cold side outlet of the first heat exchanger 2-2 and is input into the hot side of the second evaporator 1-7 via the solution driving pump 2-1. In the second evaporator 1-7, the secondary refrigerant on the hot side exchanges heat with the refrigerant on the cold side, and the cold is transferred to the secondary refrigerant.

[0037] Optionally, the secondary refrigerant can be an ethylene glycol solution. After heat exchange, the ethylene glycol solution discharged from the hot side outlet of the second evaporator 1-7 can be about -5°C.

[0038] The working process of the compression refrigeration system is as follows: The compressor 2-8 compresses the low-temperature and low-pressure steam into high-temperature and high-pressure steam; the steam passes through the first heat exchanger 2-2 before entering the first condenser 2-5 to utilize the cold transferred by the secondary refrigerant circulation system to achieve the purpose of precooling; the refrigerant further becomes liquid after passing through the first condenser 2-5, and then enters the first evaporator 2-7 through the first throttle valve 2-6 for evaporation and heat absorption to achieve the refrigeration effect.

[0039] As Figure 1 shown, the compression refrigeration system further includes a heat exchange branch 2-10, a first stop valve 2-3, and a second stop valve 2-4. The heat exchange branch 2-10 is connected in parallel with the first condenser 2-5. The liquid inlet end of the heat exchange branch 2-10 is communicated with the hot side outlet of the first heat exchanger 2-2, and the outlet of the heat exchange branch 2-10 is communicated with the inlet of the first throttle valve 2-6. The first stop valve 2-3 is arranged on the heat exchange branch 2-10 to control the opening and closing of the heat exchange branch 2-10. The second stop valve 2-4 is arranged on the inlet side of the first condenser 2-5 and is connected in parallel with the first stop valve 2-3.

[0040] If the cold provided by the absorption refrigeration system is sufficient to completely condense the refrigerant in the compression refrigeration system, and at this time the first condenser 2-5 is not needed, the first stop valve 2-3 can be opened, and at the same time the second stop valve 2-4 can be closed. The refrigerant is completely condensed through the first heat exchanger 2-2, and then directly flows to the first throttle valve 2-6 through the heat exchange branch 2-10, and enters the first evaporator 2-7 after throttling to complete the evaporation refrigeration process. In this process, the first condenser 2-5 is idle.

[0041] When the cooling capacity provided by the absorption refrigeration system is insufficient to completely condense the refrigerant in the compression refrigeration system, the first shut-off valve 2-3 needs to be closed so that all the refrigerant flows through the first condenser 2-5. In the first condenser 2-5, the refrigerant completes the condensation and subcooling processes, and after passing through the first throttle valve 2-6, it can reach the pressure and temperature required to enter the first evaporator 2-7. The settings of the heat exchange branch 2-10, the first shut-off valve 2-3, and the second shut-off valve 2-4 can increase the flexibility of the compression refrigeration system.

[0042] Optionally, when selecting the compressor 2-8, it is necessary to determine according to the size of the cooling capacity required by the refrigeration system. If the cooling capacity provided by the unit is too large, the power of the compressor can be considered to be reduced; if the cooling capacity required for actual operation is very large, several more compressors can also be considered to be used in combination.

[0043] Preferably, the pipeline is made of materials with strong corrosion resistance, good durability, and long service life. The pipeline needs to be treated for anti-leakage.

[0044] Preferably, the fixing parts of the first heat exchanger 2-2 need to be made of stainless steel to reduce the possibility of being corroded.

[0045] Preferably, the first heat exchanger 2-2 adopts a plate heat exchanger, which has a large heat exchange surface area, helps to improve the heat transfer efficiency, can effectively achieve the heat transfer between fluids, and makes the heat exchange efficiency relatively high. At the same time, compared with other types of heat exchangers, the plate heat exchanger has a relatively small volume and is structurally compact. Under the same heat exchange area, the plate heat exchanger has a relatively higher space utilization rate. The plate heat exchanger is composed of movable plates and can be easily disassembled and recombined, making cleaning, maintenance, and overhaul more convenient. At the same time, the internal channels of the plate heat exchanger are relatively narrow, and the pressure drop generated when the fluid flows through is relatively small, thereby reducing the energy consumption of the system.

[0046] In a specific embodiment, the cooling capacity of the absorption refrigeration system: 5 kW, the size of the second condenser 1-3: 300×220×110 mm, the size of the second evaporator 1-7: 1030×220×300 mm, the size of the second heat exchanger 1-12: 200×140×300 mm, the pipeline diameter: 25 mm. The cooling capacity of the compression refrigeration system: 3 kW, the size of the first condenser 2-5: 500×100×210 mm, the size of the first evaporator 2-7: 980×180×260 mm, the size of the first heat exchanger 2-2: 300×230×310 mm, the pipeline diameter: 25 mm.

[0047] Preferably, pressure sensors, temperature sensors, etc. are used in the compression condensation unit to monitor the system parameters to prevent the system from malfunctioning and being unable to work properly.

[0048] Preferably, the pipelines of the absorption refrigeration system are insulated, for example, insulating cotton is wrapped outside the pipelines.

[0049] The main pre-cooling device in the compression condensation unit with waste heat recovery pre-cooling according to the embodiment of the present invention is the first heat exchanger 2-2. Taking Figure 1 as an example, in the first heat exchanger 2-2, the fluid in the right pipeline is the coolant, and the fluid in the left pipeline is the refrigerant of the compression refrigeration system. The high-temperature and high-pressure refrigerant compressed by the compressor 2-8 flows into the first heat exchanger 2-2 through the refrigerant pipeline and exchanges heat with the coolant. Since the coolant has a low temperature and the refrigerant has a high temperature, heat transfer occurs between the two in the first heat exchanger 2-2, and the coolant absorbs the heat of the refrigerant, achieving the effect of pre-cooling the vapor compression refrigeration system, avoiding the waste of waste heat, especially greatly reducing the thermal pollution of the waste heat to the environment. At the same time, the energy consumption of the compression refrigeration system decreases significantly.

[0050] By adopting the method of combining absorption refrigeration and compression refrigeration, the waste heat is converted into available cooling capacity for pre-cooling the condenser of the refrigeration system, which not only improves the utilization rate of waste heat but also improves the energy efficiency of the refrigeration system. Through pre-cooling, the condensation load of the compression refrigeration system can be reduced, the refrigeration effect can be improved, the energy consumption of the compression refrigeration system can be reduced, providing a new idea for the energy-saving design of the single-stage compression refrigeration system.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "coupling", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0054] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0055] In the present utility model, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0056] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A compression condensing unit with waste heat recovery precooling, characterized in that: include: A compression refrigeration system, comprising a compressor, a first condenser, a first throttle valve and a first evaporator connected in sequence in a refrigerant flow direction, wherein the first evaporator is used for evaporative refrigeration of the refrigerant; An absorption refrigeration system, the absorption refrigeration system comprising a waste heat generator, a second condenser, a second throttle valve, a second evaporator, an absorber and a solution pump, the waste heat generator is used to heat a working medium pair of a refrigerant and an absorbent, the waste heat generator has a refrigerant vapor outlet and an absorbent outlet, the refrigerant vapor outlet of the waste heat generator is connected to the second condenser, the second throttle valve and the second evaporator in sequence, the second evaporator is used for evaporative refrigeration of the refrigerant, the outlet of the second evaporator and the absorbent outlet of the waste heat generator are both connected to the absorber, and the solution pump is used to transport the working medium pair in the absorber to the waste heat generator; A refrigerant circulation system, the refrigerant circulation system includes a refrigerant circuit and a heat exchanger, the hot side of the second evaporator and the cold side of the heat exchanger are connected in the refrigerant circuit, the hot side of the heat exchanger is connected between the compressor and the first condenser, the second evaporator transfers cold energy to the compression refrigeration system through the refrigerant and the heat exchanger in the refrigerant circuit, and pre-cools the refrigerant vapor before entering the first condenser.

2. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The compression refrigeration system comprises: A heat exchange branch, the heat exchange branch is connected in parallel with the first condenser, the liquid inlet end of the heat exchange branch is communicated with the hot side outlet of the heat exchanger, and the outlet of the heat exchange branch is communicated with the inlet of the first evaporator; a first stop valve, the first stop valve being arranged on the heat exchange branch; and A second stop valve is disposed at the inlet side of the first condenser and is connected in parallel with the first stop valve.

3. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The absorption refrigeration system also includes a subcooler and a third throttle valve, the hot side of the subcooler is connected between the second condenser and the second throttle valve, the cold side of the subcooler is connected to the outlet of the second evaporator, and the third throttle valve is connected between the second evaporator and the subcooler.

4. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The absorption refrigeration system also includes a second heat exchanger, the hot side of the second heat exchanger is connected between the absorbent outlet of the waste heat generator and the inlet of the absorber, the cold side of the second heat exchanger is connected to the outlet of the absorber, the absorbent on the hot side of the second heat exchanger exchanges heat with the working fluid on the cold side of the second heat exchanger, and the solution pump is connected between the outlet of the absorber and the second heat exchanger for transporting the working fluid to the second heat exchanger.

5. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The absorption refrigeration system further comprises a distillation tower, which is arranged above the waste heat generator and is used to distill the refrigerant vapor evaporated from the waste heat generator. The top outlet of the distillation tower is connected to the second condenser.

6. The compression condensing unit with waste heat recovery precooling according to claim 5, characterized in that: It also includes a regulating valve, the outlet of the second condenser is connected to the inlet of the regulating valve, and the outlet of the regulating valve is connected to the reflux port of the distillation tower.

7. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The brine circulation system comprises a solution-driven pump, which is arranged in the brine circuit and is used to drive the brine in the brine circuit.

8. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The absorption refrigeration system further comprises a condenser liquid reservoir, which is arranged at the outlet side of the second condenser and is used to store condensed liquid coolant.

9. The compression condensing unit with waste heat recovery precooling according to claim 1, characterized in that: The cooling agent is ethylene glycol solution.

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