Waste heat recovery refrigeration and heat pump dual purpose unit

Abstract

The present invention relates to the technical field of waste heat energy utilization, and specifically to a waste heat recovery refrigeration and heat pump dual-purpose unit. By setting an evaporator, a condenser, a generator and an absorber, as well as a refrigerant and a lithium bromide solution arranged therein, the heat of industrial waste hot water is converted into a refrigeration or heating driving force to meet the process refrigeration or process heating requirements. By setting a refrigeration conversion valve, a heating conversion valve, and a first connecting pipeline and a second connecting pipeline, the switching of different liquid flow directions is achieved, and the pressure difference between the evaporator and the condenser and the pressure difference between the generator and the absorber are adjusted, thereby achieving one machine for two uses. The process waste heat can be used for refrigeration in summer to meet the process cold demand, and hot water or steam can be produced in winter to meet the process heat demand. The year-round utilization of the process low-temperature waste heat is achieved to solve the problem that it cannot be effectively utilized in winter. The process low-temperature waste heat is not restricted by region and can be used throughout the country. It can be switched and used according to the refrigeration or heating requirements.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat energy utilization, and in particular to a waste heat recovery refrigeration and heat pump dual-purpose unit. Background Art

[0002] Absorption units can recycle industrial waste heat, and are specifically divided into absorption refrigerators and absorption heat pumps. Absorption refrigerators can recycle waste heat above 60°C for waste heat refrigeration, and absorption heat pumps are divided into first-class absorption heat pumps and second-class absorption heat pumps. First-class absorption heat pumps can recycle waste heat from 10°C to 60°C to produce hot water below 100°C, which is generally used in the field of heating or process heating; second-class absorption heat pumps can recycle waste heat above 60°C to produce hot water above 100°C, and can produce steam through flash devices, which is generally used in the field of process heating.

[0003] Due to the different structures of absorption refrigeration units and absorption heat pump units, many factory process waste heat recovery occasions require waste heat recovery for refrigeration in summer, and waste heat recovery for heating through absorption heat pumps in winter. In order to effectively utilize waste heat, factories need to purchase the above two types of equipment separately. The overall cost is high, the area occupied is large, and the effective utilization time of each device is very low.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] In view of this, the present invention provides a waste heat recovery refrigeration and heat pump dual-purpose unit, thereby achieving dual purposes of one machine. Factory waste heat can be used for both refrigeration and heating according to demand, greatly improving equipment utilization.

[0006] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0007] The present invention provides a waste heat recovery refrigeration and heat pump dual-purpose unit, which includes an evaporator, an absorber, a condenser and a generator; the evaporator is provided with a refrigerant circulation system and a first heat exchange pipeline, and the liquid inlet and the liquid discharge port of the first heat exchange pipeline are both located outside the evaporator; the condenser is provided with a second heat exchange pipeline, and the liquid inlet and the liquid discharge port of the second heat exchange pipeline are both located outside the condenser; the generator is provided with a low-concentration lithium bromide solution and a third heat exchange pipeline, and the liquid inlet and the liquid discharge port of the third heat exchange pipeline are both located outside the generator, and the upper part of the generator is connected with the upper part of the condenser; the absorber is provided with a high-concentration lithium bromide solution circulation device and a fourth heat exchange pipeline, and the liquid inlet and the liquid discharge port of the fourth heat exchange pipeline are both located outside the absorber part; the upper part of the absorber is connected to the upper part of the evaporator; the pressure difference between the evaporator and the condenser is adjustable; the pressure difference between the generator and the absorber is adjustable; the liquid inlet of the first heat exchange pipeline is provided with a refrigeration conversion valve, the discharge port of the second heat exchange pipeline is provided with a heat pump conversion valve, the discharge port of the third heat exchange pipeline is provided with a refrigeration conversion valve, and the liquid inlet of the fourth heat exchange pipeline is provided with a heat pump conversion valve; the liquid inlet section of the first heat exchange pipeline and the discharge section of the third heat exchange pipeline are connected by a first connecting pipeline, and the heat pump conversion valve is provided in the first connecting pipeline; the discharge section of the second heat exchange pipeline and the liquid inlet section of the fourth heat exchange pipeline are connected by a second connecting pipeline, and the refrigeration conversion valve is provided in the second connecting pipeline.

[0008] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, the bottom of the generator and the top of the absorber are connected by a concentrate pipeline, and a concentrate pump is provided on the concentrate pipeline for transporting the high-concentration lithium bromide solution at the bottom of the generator to the absorber.

[0009] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, a concentrate throttling device is provided on the concentrate pipeline for adjusting the pressure difference between the generator and the absorber; the concentrate throttling device is arranged between the absorber and the concentrate pump, and comprises a concentrate pressure gauge and a concentrate throttling valve, two concentrate pressure gauges are respectively arranged at both ends of the concentrate throttling valve, and the concentrate throttling valve adjusts the opening and closing degree according to the indications of the two concentrate pressure gauges.

[0010] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, the bottom of the absorber and the top of the generator are connected by a dilute liquid pipeline, and a dilute liquid pump is provided on the dilute liquid pipeline for transporting the low-concentration lithium bromide solution dilute liquid at the bottom of the evaporator to the generator.

[0011] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, a dilute liquid throttling device is provided on the dilute liquid pipeline for adjusting the pressure difference between the generator and the absorber, and the dilute liquid throttling device is arranged between the generator and the dilute liquid pump, and the dilute liquid throttling device includes a dilute liquid pressure gauge and a dilute liquid throttling valve, and the dilute liquid throttling valve is arranged between the two dilute liquid pressure gauges, and the dilute liquid throttling valve adjusts the opening and closing degree according to the indications of the two dilute liquid pressure gauges.

[0012] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, the bottom of the condenser is connected to the evaporator through a refrigerant pipeline, and a refrigerant pump is provided on the refrigerant pipeline for transporting the refrigerant at the bottom of the condenser to the evaporator.

[0013] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, a refrigerant throttling device is provided on the refrigerant pipeline, and the refrigerant throttling device is automatically adjusted by the pressure in the evaporator and the condenser; the refrigerant throttling device is arranged between the evaporator and the refrigerant pump, and the refrigerant throttling device includes a refrigerant pressure gauge and a refrigerant throttling valve, two of the refrigerant pressure gauges are arranged on the evaporator and the condenser, and the refrigerant throttling valve adjusts the opening according to the indications of the two refrigerant pressure gauges to adapt to the pressure difference between the evaporator and the condenser.

[0014] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, a refrigerant spray device is provided in the evaporator, a high-concentration lithium bromide solution spray device is provided in the absorber, and a low-concentration lithium bromide solution spray device is provided in the generator.

[0015] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred solution, it also includes a heat exchanger, which is arranged between the absorber and the generator, and the concentrated solution pipeline and the diluted solution pipeline exchange heat through the heat exchanger.

[0016] In the waste heat recovery refrigeration and heat pump dual-purpose unit as described above, as a preferred embodiment, a refrigerant storage device is provided at the bottom of the condenser, and a concentration regulating valve and an evaporator liquid level regulating valve are respectively provided on the refrigerant storage device, the refrigerant storage device is connected to the bottom of the evaporator through the evaporator liquid level regulating valve, one end of the concentration regulating valve is connected to the refrigerant storage device, and the other end is provided on the refrigerant pipeline between the refrigerant throttling device and the refrigerant pump, when the refrigerant concentration is higher than a preset value, the opening of the concentration regulating valve is reduced, and more refrigerant is circulated; when the refrigerant concentration difference is lower than a preset value, the opening of the concentration regulating valve is increased, and the refrigerant enters the refrigerant storage device through the refrigerant pump-concentration regulating valve circulation; when the liquid level in the evaporator is higher than the predetermined liquid level, the evaporator liquid level regulating valve is opened, and the refrigerant in the evaporator enters the refrigerant storage device.

[0017] Compared with the closest prior art, the waste heat recovery refrigeration and heat pump dual-purpose unit provided by the present invention has the following beneficial effects:

[0018] The waste heat recovery refrigeration and heat pump dual-purpose unit provided by the present invention realizes the conversion of the heat of industrial waste hot water into a refrigeration or heating driving force by setting an evaporator, a condenser, a generator and an absorber, as well as the refrigerant and lithium bromide solution set therein, so as to realize the process refrigeration or process heating requirements. By setting a refrigeration conversion valve, a heating conversion valve and a first connecting pipeline and a second connecting pipeline, the switching of different liquid flow directions is realized, and the pressure difference between the evaporator and the condenser and the pressure difference between the generator and the absorber are adjusted, so as to realize one machine for two purposes. The process waste heat can realize refrigeration in summer to meet the process cold demand, and produce hot water or steam above 100°C in winter to meet the process heat demand. The year-round utilization of the process low-temperature waste heat is realized, solving the problem that it cannot be effectively utilized in winter. The process low-temperature waste heat is not restricted by region and can be used throughout the country. It can be switched and used according to the refrigeration or heating requirements, and the equipment utilization rate is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a waste heat recovery refrigeration and heat pump dual-purpose unit according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a refrigerant storage device according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of a throttling device provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the working process of the waste heat recovery refrigeration stage in an embodiment of the present invention;

[0023] Figure 5Schematic diagram of the working process of the waste heat recovery heating stage in an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Evaporator; 2. Absorber; 3. Heat exchanger; 4. Generator; 5. Condenser; 6. Weak liquid pump; 7. Concentrated liquid pump; 8. Refrigerant pump; 9. Refrigerant circulation pump; 10. Weak liquid throttling device; 11. Concentrated liquid throttling device; 12. Refrigerant throttling device; 13. Concentrated liquid storage device; 14. Refrigerant storage device; 15. Refrigeration conversion valve; 16. Heat pump conversion valve; 17. First heat exchange pipeline; 18. Second heat exchange pipeline; 19. Third heat exchange pipeline; 20. Fourth heat exchange pipeline; 31. Evaporator liquid level regulating valve; 33. Solution concentration regulating valve; 41. Refrigerant pressure gauge; 44. Refrigerant throttling valve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The exemplary embodiments of the present invention are described below in conjunction with specific circumstances:

[0028] Please refer to Figures 1 to 3, is a waste heat recovery refrigeration and heat pump dual-purpose unit of this embodiment, which includes an evaporator 1, an absorber 2, a condenser 5 and a generator 4; a refrigerant circulation system and a first heat exchange pipeline 17 are provided in the evaporator 1, and the liquid inlet and the liquid discharge port of the first heat exchange pipeline 17 are both located outside the evaporator 1; a second heat exchange pipeline 18 is provided in the condenser 5, and the liquid inlet and the liquid discharge port of the second heat exchange pipeline 18 are both located outside the condenser 5; a low-concentration lithium bromide solution and a third heat exchange pipeline 19 are provided in the generator 4, and the liquid inlet and the liquid discharge port of the third heat exchange pipeline 19 are both located outside the generator 4, and the upper part of the generator 4 is connected to the upper part of the condenser 5; a high-concentration lithium bromide solution circulation device and a fourth heat exchange pipeline 20 are provided in the absorber 2, and the liquid inlet and the liquid discharge port of the fourth heat exchange pipeline 20 are both located outside the absorber 2; The upper part of the absorber 2 is connected to the upper part of the evaporator 1; the pressure difference between the evaporator 1 and the condenser 5 is adjustable; the pressure difference between the generator 4 and the absorber 2 is adjustable; the liquid inlet of the first heat exchange pipeline 17 is provided with a refrigeration conversion valve 15, the discharge port of the second heat exchange pipeline 18 is provided with a heat pump conversion valve 16, the discharge port of the third heat exchange pipeline 19 is provided with a refrigeration conversion valve 15, and the liquid inlet of the fourth heat exchange pipeline 20 is provided with a heat pump conversion valve 16; the liquid inlet section of the first heat exchange pipeline 17 and the discharge section of the third heat exchange pipeline 19 are connected by a first connecting pipeline, and the heat pump conversion valve 16 is provided in the first connecting pipeline; the discharge section of the second heat exchange pipeline 18 and the liquid inlet section of the fourth heat exchange pipeline 20 are connected by a second connecting pipeline, and the refrigeration conversion valve 15 is provided in the second connecting pipeline.

[0029] Furthermore, the bottom of the generator 4 is connected to the top of the absorber 2 via a concentrate pipeline, and a concentrate pump 7 is provided on the concentrate pipeline for transporting the high-concentration lithium bromide solution at the bottom of the generator 4 to the absorber 2 .

[0030] Furthermore, a concentrate throttling device 11 is provided on the concentrate pipeline for adjusting the pressure difference between the generator 4 and the absorber 2; the concentrate throttling device 11 is arranged between the absorber 2 and the concentrate pump 7, and includes a concentrate pressure gauge and a concentrate throttling valve, the two concentrate pressure gauges are respectively arranged at both ends of the concentrate throttling valve, and the concentrate throttling valve adjusts the opening and closing degree according to the indications of the two concentrate pressure gauges.

[0031] Furthermore, the bottom of the absorber 2 is connected to the top of the generator 4 via a dilute liquid pipeline, and a dilute liquid pump 6 is provided on the dilute liquid pipeline for conveying the low-concentration lithium bromide solution dilute liquid at the bottom of the evaporator 1 to the generator 4 .

[0032] Furthermore, a dilute liquid throttling device 10 is provided on the dilute liquid pipeline for adjusting the pressure difference between the generator 4 and the absorber 2. The dilute liquid throttling device 10 is arranged between the generator 4 and the dilute liquid pump 6. The dilute liquid throttling device 10 includes a dilute liquid pressure gauge and a dilute liquid throttling valve. The dilute liquid throttling valve is arranged between the two dilute liquid pressure gauges. The dilute liquid throttling valve adjusts the opening and closing degree according to the indications of the two dilute liquid pressure gauges.

[0033] Furthermore, the bottom of the condenser 5 is connected to the evaporator 1 via a refrigerant pipeline, and a refrigerant pump 8 is provided on the refrigerant pipeline for transporting the refrigerant at the bottom of the condenser 5 to the evaporator 1 .

[0034] Furthermore, a refrigerant throttling device 12 is provided on the refrigerant pipeline, and the refrigerant throttling device 12 is automatically adjusted by the pressure in the evaporator 1 and the condenser 5; the refrigerant throttling device 12 is arranged between the evaporator 1 and the refrigerant pump 8, and the refrigerant throttling device 12 includes a refrigerant pressure gauge 41 and a refrigerant throttling valve 44, two refrigerant pressure gauges 41 are arranged at one end of the evaporator 1 and the condenser 5, and the refrigerant throttling valve 44 automatically adjusts the opening according to the indications of the two refrigerant pressure gauges 41 to adapt to the pressure difference between the evaporator 1 and the condenser 5.

[0035] Furthermore, a refrigerant spraying device is provided in the evaporator 1 , a high-concentration lithium bromide solution spraying device is provided in the absorber 2 , and a low-concentration lithium bromide solution spraying device is provided in the generator 4 .

[0036] Furthermore, a heat exchanger 3 is included, which is arranged between the absorber 2 and the generator 4. The concentrated solution pipeline and the diluted solution pipeline exchange heat through the heat exchanger 3. The function of the heat exchanger is to recover internal heat, which can improve system efficiency.

[0037] Furthermore, a refrigerant storage device 14 is provided at the bottom of the condenser 5, and a solution concentration regulating valve 33 and an evaporator liquid level regulating valve 31 are respectively provided on the refrigerant storage device 14. The refrigerant storage device 14 is connected to the bottom of the evaporator 1 through the evaporator liquid level regulating valve 31. One end of the solution concentration regulating valve 33 is connected to the refrigerant storage device 14, and the other end is provided on the refrigerant pipeline between the refrigerant throttling device 12 and the refrigerant pump 8. When the concentration difference of the solution (i.e., the refrigerant solution) is higher than a preset value, the opening of the solution concentration regulating valve 33 is reduced, and more refrigerant circulates. When the concentration difference of the refrigerant solution is lower than a preset value, the opening of the solution concentration regulating valve 33 is increased, and more refrigerant circulates into the refrigerant storage device 14 through the refrigerant pump 8 and the solution concentration regulating valve 33; when the liquid level in the evaporator 1 is higher than the predetermined liquid level, the evaporator liquid level regulating valve 31 is opened, and the refrigerant in the evaporator 1 enters the refrigerant storage device 14.

[0038] A concentrated liquid storage device 13 is also provided at the lower part of the generator 4, and its structure is the same as that of the refrigerant storage device 14, which will not be described in detail here.

[0039] like Figure 4 As shown, it is a schematic diagram of the working process of the waste heat recovery refrigeration stage in the embodiment of the present invention; the arrow in the figure indicates the direction of liquid flow. When the unit is running in the refrigeration mode, the three refrigeration conversion valves 15 are all opened, and the three heat pump conversion valves 16 are all closed. The waste hot water generated by the industry (i.e., the water to be treated) enters the third heat exchange pipeline 19 through the liquid inlet, and is discharged through the discharge port of the third heat exchange pipeline 19 after completing the heat exchange. The cooling water enters through the liquid inlet of the second heat exchange pipeline 18 and is discharged through the discharge port of the fourth heat exchange pipeline 20. The cold water to be refrigerated enters through the liquid inlet of the first heat exchange pipeline 17 and is discharged through its discharge port. The temperature of the waste hot water heats the low-concentration lithium bromide solution in the inner shell of the generator 4, and the water in the low-concentration lithium bromide solution evaporates into water vapor, so that the low-concentration lithium bromide solution becomes a high-concentration lithium bromide solution. The high-concentration lithium bromide solution enters the absorber 2 through the concentrate pump 7, the concentrate throttling device 11 and the heat exchanger 3. In the absorber 2, the high-concentration lithium bromide solution absorbs the refrigerant vapor from the evaporator 1 and maintains the low-pressure environment in the evaporator 1. At the same time, the high-concentration lithium bromide solution is diluted to become a low-concentration lithium bromide solution, and the low-concentration lithium bromide solution enters the generator 4 through the dilute solution pump 6, the dilute solution throttling device 10 and the heat exchanger 3. The water vapor (or refrigerant vapor) evaporated from the generator 4 enters the condenser 5, and the refrigerant vapor in the condenser 5 exchanges heat with the cooling water in the second heat exchange pipeline 18 to become refrigerant water. The refrigerant water enters the evaporator 1 through the refrigerant pump 8 and the refrigerant throttling device 12. The refrigerant water circulates in the evaporator 1 through the refrigerant circulation pump 9. The refrigerant water evaporates under the low-pressure environment of the evaporator 1 and becomes refrigerant vapor. At the same time, the evaporation process absorbs the heat of the cold water in the first heat exchange pipeline 17 to reduce the temperature of the cold water, thereby achieving the purpose of refrigeration. The cooling water enters the condenser 5 and the absorber 2 in turn, takes out the system heat and ensures the system circulation; the cold water enters the evaporator 1, and the temperature is reduced to become low-temperature cold water for refrigeration. The low-temperature cold water can be connected to water air conditioners and other equipment to achieve the purpose of cooling the workshop. Taking the coking process as an example, when the 16°C cold water mode is operated in summer, the pressure of the generator 4 is adjusted to be greater than the pressure of the absorber 2 through the dilute solution throttling device 10 and the concentrated solution throttling device 11, and the pressure of the evaporator 1 is adjusted to be greater than the pressure of the condenser 5 through the refrigerant throttling device 12. The pressure difference is 4-5Kpa, and the average concentration of the high-concentration lithium bromide solution and the low-concentration lithium bromide solution is about 52.5%.

[0040] like Figure 5As shown, it is a schematic diagram of the working process of the waste heat recovery heating stage in an embodiment of the present invention. The arrow in the figure indicates the direction of liquid flow. When the unit is operating in the heating mode, the three refrigeration conversion valves 15 are closed, and the three heat pump conversion valves 16 are opened. The waste hot water generated by the industry (i.e., the water to be treated) enters the third heat exchange pipeline 19 through the liquid inlet, and is discharged through the drain port of the first heat exchange pipeline 17 after completing the heat exchange. The cooling water enters through the liquid inlet of the second heat exchange pipeline, passes through the condenser 5 and the absorber 2, and is discharged through the drain port of the fourth heat exchange pipeline 20. The hot water to be heated enters through the liquid inlet of the fourth heat exchange pipeline 20, and is discharged through the drain port after passing through the absorber 2. The waste hot water enters the generator 4 and the evaporator 1 in sequence, heats the shell-side refrigerant water in the evaporator 1, and the refrigerant water becomes refrigerant steam. The shell-side low-concentration lithium bromide solution is heated in the generator 4, and the water vapor in the low-concentration lithium bromide solution evaporates. At the same time, the low-concentration lithium bromide solution is concentrated into a high-concentration lithium bromide solution. The high-concentration lithium bromide solution passes through the concentrate pump 7, the concentrate throttling device 11, and the heat exchanger 3 and enters the absorber 2. In the absorber 2, the high-concentration lithium bromide solution absorbs the refrigerant steam from the evaporator 1, and transfers the heat to the absorber 2. The hot water in the pipe side of the fourth heat exchange pipeline 20 is delivered to realize the production of high-temperature hot water. In the absorber 2, the high-concentration lithium bromide solution is changed into a low-concentration lithium bromide solution, and the low-concentration lithium bromide solution enters the generator 4 through the weak liquid pump 6, the weak liquid throttling device 10, and the heat exchanger 3; the refrigerant vapor evaporated from the generator 4 enters the condenser 5, and the refrigerant vapor exchanges heat with the cooling water in the second heat exchange pipeline 18 in the condenser 5 to become refrigerant water, and the refrigerant water enters the evaporator 1 through the refrigerant pump 8 and the refrigerant throttling device 12. The cooling water enters the condenser 5, takes out the system heat, and ensures the system circulation; the hot water to be heated enters the absorber 2, and is heated into high-temperature hot water for process heating, and can also be converted into steam for use through the flash evaporation device. Taking the preparation of hot water above 110°C in winter as an example, the concentrated liquid throttling device 11 and the dilute liquid throttling device 10 are used to adjust the pressure of the generator 4 to be lower than the pressure of the absorber 2, and the refrigerant throttling device 12 is used to adjust the pressure of the evaporator 1 to be lower than the pressure of the condenser 5. The pressure difference is 26 to 30 KPa, and the average concentration of the lithium bromide solution is about 56.3%.

[0041] In summary, the waste heat recovery refrigeration and heat pump dual-purpose unit provided by the present invention realizes the conversion of the heat of industrial waste hot water into a refrigeration or heating driving force by setting an evaporator, a condenser, a generator and an absorber, as well as the refrigerant and lithium bromide solution arranged therein, so as to realize the process refrigeration or process heating requirements. By setting a refrigeration conversion valve, a heating conversion valve, and a first connecting pipeline and a second connecting pipeline, the switching of different liquid flow directions is realized, and the pressure difference between the evaporator and the condenser and the pressure difference between the generator and the absorber are adjusted, so as to realize one machine for two uses. The process waste heat can realize refrigeration in summer to meet the process cold demand, and produce hot water or steam above 100°C in winter to meet the process heat demand. The year-round utilization of process low-temperature waste heat is realized to solve the problem that it cannot be effectively utilized in winter. The process low-temperature waste heat is not restricted by region and can be used throughout the country. It can be switched and used according to the needs of refrigeration or heating.

[0042] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0043] The specific implementation methods provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A waste heat recovery refrigeration and heat pump dual-purpose unit, characterized in that: The invention comprises an evaporator, an absorber, a condenser and a generator; the evaporator is provided with a refrigerant circulation system and a first heat exchange pipeline, and the liquid inlet and the liquid discharge port of the first heat exchange pipeline are both located outside the evaporator; the condenser is provided with a second heat exchange pipeline, and the liquid inlet and the liquid discharge port of the second heat exchange pipeline are both located outside the condenser; the generator is provided with a low-concentration lithium bromide solution and a third heat exchange pipeline, and the liquid inlet and the liquid discharge port of the third heat exchange pipeline are both located outside the generator, and the upper part of the generator is communicated with the upper part of the condenser; the absorber is provided with a high-concentration lithium bromide solution circulation device and a fourth heat exchange pipeline, and the liquid inlet and the liquid discharge port of the fourth heat exchange pipeline are both located outside the absorber; the upper part of the absorber is communicated with the upper part of the evaporator; the pressure difference between the evaporator and the condenser is adjustable; the pressure difference between the generator and the absorber is adjustable; the first heat exchange The liquid inlet of the heat exchange pipeline is provided with a refrigeration conversion valve, the discharge port of the second heat exchange pipeline is provided with a heat pump conversion valve, the discharge port of the third heat exchange pipeline is provided with a refrigeration conversion valve, and the liquid inlet of the fourth heat exchange pipeline is provided with a heat pump conversion valve; the liquid inlet section of the first heat exchange pipeline and the discharge section of the third heat exchange pipeline are connected by a first connecting pipeline, and a heat pump conversion valve is provided in the first connecting pipeline; the discharge section of the second heat exchange pipeline and the liquid inlet section of the fourth heat exchange pipeline are connected by a second connecting pipeline, and a refrigeration conversion valve is provided in the second connecting pipeline; the bottom of the generator and the top of the absorber are connected by a concentrate pipeline, and a concentrate pump is provided on the concentrate pipeline for transporting the high-concentration lithium bromide solution at the bottom of the generator to the absorber, and a concentrate throttling device is provided on the concentrate pipeline for adjusting the pressure difference between the generator and the absorber;The concentrate throttling device is arranged between the absorber and the concentrate pump, and includes a concentrate pressure gauge and a concentrate throttling valve. The two concentrate pressure gauges are respectively arranged at both ends of the concentrate throttling valve. The concentrate throttling valve adjusts the opening and closing degree according to the indications of the two concentrate pressure gauges. The bottom of the absorber is connected to the top of the generator through a dilute liquid pipeline. The dilute liquid pipeline is provided with a dilute liquid pump for transporting the low-concentration lithium bromide solution dilute liquid at the bottom of the evaporator to the generator. The dilute liquid pipeline is provided with a dilute liquid throttling device for adjusting the pressure difference between the generator and the absorber. The dilute liquid throttling device is arranged between the generator and the dilute liquid pump. The dilute liquid throttling device includes a dilute liquid pressure gauge and a dilute liquid throttling valve. The dilute liquid throttling valve is arranged at two The dilute liquid pressure gauges are arranged between the dilute liquid throttle valve, and the dilute liquid throttle valve adjusts the opening and closing degree according to the indications of the two dilute liquid pressure gauges. The bottom of the condenser is connected to the evaporator through a refrigerant pipeline. A refrigerant pump is arranged on the refrigerant pipeline to transport the refrigerant at the bottom of the condenser to the evaporator. A refrigerant throttling device is arranged on the refrigerant pipeline, and the refrigerant throttling device is automatically adjusted by the pressure in the evaporator and the condenser. The refrigerant throttling device is arranged between the evaporator and the refrigerant pump. The refrigerant throttling device includes a refrigerant pressure gauge and a refrigerant throttling valve. The two refrigerant pressure gauges are arranged on the evaporator and the condenser. The refrigerant throttling valve adjusts the opening degree according to the indications of the two refrigerant pressure gauges to adapt to the pressure difference between the evaporator and the condenser. ; 2. The waste heat recovery refrigeration and heat pump dual-purpose unit according to claim 1 is characterized in that: The evaporator is provided with a refrigerant spraying device, the absorber is provided with a high-concentration lithium bromide solution spraying device, and the generator is provided with a low-concentration lithium bromide solution spraying device.

3. The waste heat recovery refrigeration and heat pump dual-purpose unit according to claim 1 is characterized in that: The invention also comprises a heat exchanger, wherein the heat exchanger is arranged between the absorber and the generator, and the concentrated solution pipeline and the diluted solution pipeline exchange heat through the heat exchanger.

4. The waste heat recovery refrigeration and heat pump dual-purpose unit according to claim 1 is characterized in that: A refrigerant storage device is provided at the bottom of the condenser, and a concentration regulating valve and an evaporator liquid level regulating valve are respectively provided on the refrigerant storage device. The refrigerant storage device is connected to the bottom of the evaporator through the evaporator liquid level regulating valve. One end of the concentration regulating valve is connected to the refrigerant storage device, and the other end is provided on the refrigerant pipeline between the refrigerant throttling device and the refrigerant pump. When the refrigerant concentration difference is higher than a preset value, the opening of the concentration regulating valve is reduced, and more refrigerant is circulated; when the refrigerant concentration difference is lower than a preset value, the opening of the concentration regulating valve is increased, and the refrigerant enters the refrigerant storage device through the refrigerant pump-concentration regulating valve circulation; when the liquid level in the evaporator is higher than the predetermined liquid level, the evaporator liquid level regulating valve is opened, and the refrigerant in the evaporator enters the refrigerant storage device.

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