Lithium bromide absorption type unit capable of achieving double-effect refrigeration and single-effect heating

Abstract

The invention relates to a lithium bromide absorption type unit capable of double-effect refrigeration and single-effect heating, which is characterized in that on the basis of a steam double-effect type lithium bromide absorption type water chilling unit with solution parallel circulation, a heat pump generator is additionally arranged in a low-pressure generator and a condenser cylinder, and the heat pump generator is arranged between the low-pressure generator and a condenser; a condensate water heat exchanger for the heat pump is independently arranged, and switching and adjusting valves are additionally arranged between parts of pipelines for connecting all the components. The double-effect refrigeration cycle process and the single-effect heating cycle process can be safely, stably and reliably operated on the same unit through valve switching and adjusting, the initial investment of equipment is reduced, the management cost of the equipment is saved, the occupied space of the equipment is saved, the annual operation utilization rate of the unit is improved, the unit adaptability is wider, and large-scale design can be achieved. According to the unit, double-effect refrigeration can be achieved in summer to meet use of air conditioners and production processes, waste heat can be recycled for heat supply through the single-effect heat pump in winter, energy conservation and environmental protection are achieved, and good economic benefits and social benefits are achieved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to a lithium bromide absorption chiller capable of both dual-effect refrigeration and single-effect heating. Background Technology

[0002] In production processes and daily life, cooling is typically needed in summer and heating in winter. In situations with steam heat sources and low-temperature waste heat, for energy conservation and environmental protection, summer cooling requires the installation of steam-powered dual-effect lithium bromide absorption chillers (such as...). Figure 1 The diagram shows the working principle of one type of parallel circulation process for a steam-type double-effect lithium bromide absorption chiller. Winter heating requires the installation of a Class I lithium bromide absorption heat pump unit (such as...). Figure 2 The diagram shown illustrates the working principle of one type of single-effect cycle process in a first-class lithium bromide absorption heat pump unit. Simultaneous construction of both types of equipment inevitably increases initial investment and management costs. To reduce initial investment, lower operating costs, and minimize equipment footprint, it is necessary to research and develop highly efficient lithium bromide absorption heat pump units that are adaptable, energy-saving, easy to operate, safe, reliable, and capable of providing both cooling in summer and heating in winter. Summary of the Invention

[0003] The purpose of this invention is to provide a versatile, energy-saving, easy-to-operate, safe and reliable lithium bromide absorption chiller that combines dual-effect refrigeration and single-effect heating. It has a high annual utilization rate and can reduce initial investment and management costs as well as floor space.

[0004] The objective of this invention is achieved as follows: A lithium bromide absorption chiller capable of both dual-effect refrigeration and single-effect heating comprises a high-pressure generator, a low-pressure generator, a condenser, an evaporator, an absorber, a high-temperature heat exchanger, a low-temperature heat exchanger, a condensate heat exchanger for refrigeration, a high-pressure dilute solution pump, a low-pressure dilute solution pump, and a refrigerant pump, forming a steam-type dual-effect lithium bromide absorption chiller with parallel solution circulation. A heat pump generator is also installed within the cylinder containing the low-pressure generator and the condenser, positioned between them. The heat pump generator and the condenser are separated by a baffle plate assembly. The low-pressure generator and the heat pump generator share a concentrated solution bladder and concentrated solution piping. The heat pump generator is equipped with its own separate condensate heat exchanger for heat pump operation. In summer, when the unit operates in dual-effect refrigeration mode according to the solution parallel circulation process, the heat pump generator and the heat pump condensate heat exchanger stop operating. In winter, when the unit operates in heating mode according to the single-effect heating cycle, the high-pressure generator, low-pressure generator, high-temperature heat exchanger, and condensate heat exchanger for refrigeration stop operating.

[0005] Preferably, the hot water enters the condenser through the hot water inlet condenser heat exchanger pipeline, and a hot water switch valve D is arranged on the hot water inlet condenser heat exchanger pipeline. A dilute solution communication pipe is arranged between the pipelines at the outlets of the high-pressure dilute solution pump and the low-pressure dilute solution pump, and a dilute solution switch valve A is arranged on the dilute solution communication pipe. The dilute solution pipeline out of the condenser is divided into two branches, one of which is a low-pressure generator liquid inlet pipe, and a dilute solution switch valve E is arranged on the low-pressure generator liquid inlet pipe; the other of which is a heat pump generator liquid inlet pipe, and a dilute solution switch valve F is arranged on the heat pump generator liquid inlet pipe. A coolant water regulating valve G is arranged on the coolant water U-shaped pipe through which the coolant water out of the condenser enters the evaporator. A cooling water switch valve H is arranged on the cooling water pipe through which the cooling water enters the condenser, a cooling water switch valve I is arranged on the cooling water pipe out of the absorber, and a hot water switch valve J is arranged on the hot water pipeline out of the absorber and into the condenser.

[0006] Preferably, when refrigerating in summer, the heat pump steam electric regulating valve, the dilute solution switch valve A, the hot water switch valve D, the dilute solution switch valve F and the hot water switch valve J are closed; the refrigeration steam electric regulating valve, the dilute solution switch valve B, the dilute solution switch valve E, the coolant water regulating valve G, the cooling water switch valve H and the cooling water switch valve I are opened, and the opening degree of the high-temperature coolant water throttling valve K is adjusted according to the refrigeration operation requirement.

[0007] Preferably, the double-effect refrigeration working process is as follows: the high-pressure dilute solution pump lifts part of the dilute solution, which is heated by the high-temperature heat exchanger and then enters the high-pressure generator shell, the dilute solution is concentrated into high-pressure concentrated solution by the driving steam in the high-pressure generator pipe bundle, and high-temperature coolant steam is generated at the same time, the high-pressure concentrated solution is cooled by the high-temperature heat exchanger and then flows into the absorber shower plate, and the high-temperature coolant steam enters the low-pressure generator pipe bundle and is condensed into high-temperature coolant water; The low-pressure dilute solution pump lifts part of the dilute solution, which is heated by the low-temperature heat exchanger and then by the condenser heat exchanger, and then enters the low-pressure generator shower plate, the dilute solution is concentrated into low-pressure concentrated solution by being sprayed on the surface of the low-pressure generator pipe bundle and heated, and low-temperature coolant steam is generated at the same time. The low-pressure concentrated solution is cooled by the low-temperature heat exchanger and flows into the absorber panel. The low-temperature refrigerant vapor passes through the heat pump generator pipe, enters the condenser through the liquid blocking plate group, and is condensed into refrigerant water by releasing heat. The high-temperature refrigerant water is throttled by the high-temperature refrigerant water throttle valve K and enters the condenser bottom. After flashing, it flows together with the condensed refrigerant water in the condenser, enters the evaporator through the refrigerant water regulating valve G on the refrigerant water U-shaped pipe, and flashes. The unflashed refrigerant water enters the evaporator bottom and is pumped by the refrigerant pump to the surface of the evaporator pipe bundle to evaporate by absorbing heat. The evaporated refrigerant vapor enters the absorber and is absorbed by the concentrated solution sprayed on the surface of the absorber pipe bundle to become dilute solution and enters the absorber bottom.

[0008] Preferably, the driving steam supplied by the external system enters the high-pressure generator pipe through the refrigeration steam electric regulating valve and is condensed into condensed water by releasing heat. The condensed water is cooled by the refrigeration condensed water heat exchanger and flows out of the unit from the refrigeration condensed water outlet. The cold water enters the evaporator pipe through the cold water inlet and is cooled by releasing heat. After cooling, it flows out of the unit through the cold water outlet. The cooling water enters the absorber and condenser pipes in parallel through the cooling water inlet and absorbs heat to warm up. After warming up, it flows out of the unit through the cooling water outlet.

[0009] Preferably, during winter heating, the refrigeration steam electric regulating valve, the dilute solution switching valve B, the dilute solution switching valve E, the cooling water switching valve H, the cooling water switching valve I, and the high-temperature refrigerant water throttle valve K are closed. The heat pump steam electric regulating valve, the dilute solution switching valve A, the hot water switching valve D, the dilute solution switching valve F, and the hot water switching valve J are opened. The refrigerant water regulating valve G is adjusted according to the operating state of the heat pump.

[0010] Preferably, the single-effect heating working process is as follows: The high-pressure dilute solution pump and the low-pressure dilute solution pump are connected in parallel to simultaneously lift the dilute solution. The dilute solution is warmed up by the low-temperature heat exchanger and flows through the refrigeration condensed water heat exchanger to enter the heat pump generator liquid distribution pipe and then enters the heat pump generator panel. The dilute solution is sprayed on the surface of the heat pump generator pipe bundle to absorb the heat of the driving steam and become concentrated solution. The concentrated solution is cooled by the low-temperature heat exchanger and flows into the absorber panel by itself. The refrigerant vapor generated by the heat pump generator concentrated solution enters the condenser through the liquid blocking plate group, releases heat, and is condensed into refrigerant water. The refrigerant water is throttled by the refrigerant water regulating valve G and enters the evaporator to flash. The unflashed refrigerant water enters the evaporator bottom and is pumped by the refrigerant pump to the surface of the evaporator pipe bundle to evaporate by absorbing heat. The evaporated refrigerant vapor enters the absorber and is absorbed by the concentrated solution sprayed on the surface of the absorber pipe bundle to become dilute solution and enters the absorber bottom.

[0011] Preferably, the driving steam supplied by the external system enters the high-pressure generator pipe through the heat pump steam electric regulating valve and is condensed into condensed water by releasing heat. The condensed water is cooled by the heat pump condensed water heat exchanger and flows out of the unit from the heat pump condensed water outlet. The waste heat water enters the evaporator pipe from the waste heat water inlet, is cooled and then flows out of the unit through the waste heat water outlet; The hot water is divided into two paths from the hot water inlet, one path enters the absorber pipe to be heated and the other path enters the heat pump condensate heat exchanger to be heated, the hot water is combined and then enters the condenser pipe to be heated further and then flows out of the unit through the hot water outlet.

[0012] The present application has the following advantages: The new structure, valve switching and adjustment enable the double-effect refrigeration cycle and single-effect heating cycle to run safely, stably and reliably on the same unit, realize one machine with two functions, reduce the initial investment of equipment, save equipment management cost, save equipment space, and improve the annual operation rate of the unit. When designing the unit, the area of the refrigeration machine is determined first according to the external parameters and conditions of refrigeration and heating and the load size, then the area of the heat pump generator is determined according to the area of the evaporator absorber required for refrigeration, and the area of the condenser is determined according to the needs of refrigeration and heating; alternatively, the area of the heat pump unit is determined first, and then the areas of the high-pressure generator and low-pressure generator are determined according to the area of the evaporator absorber required for heating, so that the refrigeration and heating loads of the unit are matched according to the user's needs, and the material cost is reduced. The added heat pump generator makes the unit not limited by the area and structure of the high-pressure generator for refrigeration, and can be designed according to the external steam conditions, such as steam pressure between 0.8MPa.G and 0.1MPa.G, so that the unit is more adaptable, and can be designed in a large size according to the user's needs. Therefore, the unit of the present application can double-effect refrigerate in summer to meet the needs of air conditioning and production process, and single-effect heat pump in winter to recover waste heat for heating, which is very energy-saving and environmentally friendly, and has very good economic and social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a working principle diagram of one of the solution parallel circulation processes of the steam double-effect lithium bromide absorption type cold water unit.

[0014] Figure 2 It is a working principle diagram of one of the single-effect circulation processes of the first type lithium bromide absorption type heat pump unit.

[0015] Figure 3 It is a flow chart of the lithium bromide absorption type unit capable of double-effect refrigeration and single-effect heating.

[0016] In the figure: high pressure generator 1, low pressure generator 2, condenser 3, cooling water outlet or hot water outlet 4, cold water outlet or waste heat water outlet 5, evaporator 6, absorber 7, cold water inlet or waste heat water inlet 8, cooling water inlet or hot water inlet 9, refrigerant pump 10, high pressure dilute solution pump 11, low pressure dilute solution pump 12, low temperature heat exchanger 13, refrigeration condensate heat exchanger 14, refrigeration condensate outlet 15, high temperature heat exchanger 16, refrigeration steam inlet 17, refrigeration steam electric regulating valve 18, high temperature refrigerant water throttle valve K 19, heat pump generator 20, hot water switching valve D 21, heat pump condensate heat exchanger 22, heat pump condensate outlet 23, heat pump steam inlet 24, heat pump steam inlet regulating valve 25, dilute solution switching valve E 26, dilute solution switching valve F 27, cooling water switching valve I 28, hot water switching valve J 29, refrigerant water regulating valve G 30, cooling water switching valve H 31, dilute solution switching valve A 32, dilute solution switching valve B 33. DETAILED DESCRIPTION

[0017] Referring to Figure 3 The present application relates to a lithium bromide absorption unit capable of double-effect refrigeration and single-effect heating, comprising a high pressure generator 1, a low pressure generator 2, a heat pump generator 20, a condenser 3, an evaporator 6, an absorber 7, a high temperature heat exchanger 16, a low temperature heat exchanger 13, a refrigeration condensate heat exchanger 14, a heat pump condensate heat exchanger 22, a high pressure dilute solution pump 11, a low pressure dilute solution pump 12, a refrigerant pump 10, and pipelines, valves, control systems and the like connecting the components, based on a steam double-effect lithium bromide absorption cold water unit with solution parallel circulation, a heat pump generator 20 is additionally arranged in the cylinder of the low pressure generator 2 and the condenser 3, and the heat pump generator 20 is arranged between the low pressure generator 2 and the condenser 3, the heat pump generator 20 comprises heat pump generator heat transfer tube bundle, heat pump generator liquid inlet pipe, heat pump generator solution liquid distribution pipe, heat pump generator spray plate and heat pump generator front and rear pipe box, and the heat pump generator concentrated solution tank and concentrated solution pipeline are shared with the low pressure generator concentrated solution tank and concentrated solution pipeline.

[0018] The heat pump generator 20 is separately provided with a heat pump condensate heat exchanger 22, and a hot water heat pump condensate heat exchanger pipeline is separately arranged from the hot water inlet, and the hot water switching valve D 21 is arranged on the pipeline.

[0019] A dilute solution communication pipe is arranged between the pipelines at the outlets of the high pressure dilute solution pump 11 and the low pressure dilute solution pump 12, and the dilute solution switching valve A 32 is arranged on the dilute solution communication pipe. The dilute solution switching valve B 33 is arranged on the dilute solution pipeline before entering the high temperature heat exchanger. The dilute solution pipeline from the refrigeration condensate heat exchanger 14 is divided into two branches, one branch is a low pressure generator liquid inlet pipe, and the dilute solution switching valve E 26 is arranged on the low pressure generator liquid inlet pipe; the other branch is a heat pump generator liquid inlet pipe, and the dilute solution switching valve F 27 is arranged on the heat pump generator liquid inlet pipe.

[0020] A coolant water regulating valve G30 is provided on the coolant water U-tube through which the coolant water from the condenser enters the evaporator.

[0021] A cooling water switching valve H31 is provided on the cooling water pipe through which the cooling water enters the condenser, a cooling water switching valve I28 is provided on the cooling water pipe through which the cooling water exits the absorber, and a hot water switching valve J29 is provided on the hot water pipe through which the hot water exits the absorber and enters the condenser.

[0022] In summer, when the unit is running in double-effect refrigeration mode, close the five valves: heat pump steam electric regulating valve 25, dilute solution switching valve A 32, hot water switching valve D 21, dilute solution switching valve F 27, and hot water switching valve J 29. Stop the operation of heat pump generator 20 and heat pump condenser 22. Open the six valves: refrigeration steam electric regulating valve 18, dilute solution switching valve B 33, dilute solution switching valve E 26, refrigerant water regulating valve G 30, cooling water switching valve H 31, and cooling water switching valve I 28. Adjust the opening of high-temperature refrigerant water throttle valve K according to the refrigeration operation requirements. The double-effect refrigeration process is as follows: high-pressure dilute solution pump 11 lifts part of the dilute solution to enter the high-pressure generator 1 shell after being warmed by high-temperature heat exchanger 16. The driving steam in the high-pressure generator tube bundle concentrates the dilute solution into high-pressure concentrated solution, while generating high-temperature refrigerant steam. The high-pressure concentrated solution enters the absorber 7 tray after being cooled by the high-temperature heat exchanger 16. The high-temperature refrigerant steam enters the low-pressure generator 2 tube bundle and condenses into high-temperature refrigerant water. Low-pressure dilute solution pump 12 lifts part of the dilute solution to enter the low-pressure generator 2 tray after being warmed by low-temperature heat exchanger 13 and refrigeration condenser 14. The low-pressure concentrated solution is concentrated into low-pressure concentrated solution by being sprayed on the surface of the low-pressure generator 2 tube bundle, while generating low-temperature refrigerant steam. The low-pressure concentrated solution enters the absorber 7 tray after being cooled by the low-temperature heat exchanger 13. The low-temperature refrigerant steam enters the condenser 3 through the liquid blocking plate group and condenses into refrigerant water. The high-temperature refrigerant water enters the evaporator 6 after being throttled by the high-temperature refrigerant water throttle valve K 19 and flashing in the condenser 3. The refrigerant water enters the evaporator 6 through the refrigerant water regulating valve G 30 on the refrigerant water U-shaped pipe. The refrigerant water that does not flash enters the evaporator 6 bottom and is pumped by the refrigerant pump 10 to the surface of the evaporator 6 tube bundle to evaporate. The evaporated refrigerant steam enters the absorber 7 and is absorbed by the concentrated solution sprayed on the surface of the absorber 7 tube bundle to become dilute solution and enter the absorber 7 bottom. The driving steam supplied by the external system enters the high-pressure generator 1 tube bundle through the refrigeration steam electric regulating valve 18 and condenses into condensate. The condensate flows out of the unit through the refrigeration condensate outlet 15 after being cooled by the refrigeration condensate heat exchanger 14. The cooling water enters the evaporator 6 and condenser 3 tube bundles through the cooling water inlet 9 and flows out of the unit through the cooling water outlet 4 after being cooled by the cooling water switching valve H 31 and the cooling water switching valve I 28. The unit continuously circulates to produce cold water for users.

[0023] In winter, the unit is running in single-effect heating cycle process for heating condition, close the refrigeration steam electric regulating valve 18, dilute solution switching valve B33, dilute solution switching valve E26, cooling water switching valve H31, cooling water switching valve I28, high temperature refrigerant water throttle valve K19, six valves, high pressure generator 1, low pressure generator 2, high temperature heat exchanger 16 and refrigeration condenser water heat exchanger 14 stop running; open the heat pump steam inlet regulating valve 25, dilute solution switching valve A32, hot water switching valve D21, dilute solution switching valve F27, hot water switching valve J29, five valves, according to the need of heat pump operation state adjustment refrigerant water regulating valve G30 opening degree. Single-effect heating process is: high pressure dilute solution pump 11 and low pressure dilute solution pump 12 parallel to improve the dilute solution, the dilute solution is heated by low temperature heat exchanger 13 and flows through the refrigeration condenser water heat exchanger 14 into the heat pump generator 20 distribution pipe and then enters the heat pump generator 20 shower plate, the dilute solution is sprayed on the surface of the heat pump generator 20 pipe bundle to absorb the heat of the steam and become concentrated solution, the concentrated solution is cooled by low temperature heat exchanger 13 and flows into the absorber 7 shower plate; the refrigerant steam generated by the heat pump generator 20 concentrated solution enters the condenser 3 through the liquid retaining plate group, releases heat and condenses into refrigerant water, the refrigerant water enters the evaporator 6 through the refrigerant water regulating valve G30 throttle, the refrigerant water that is not flashed enters the bottom of the evaporator 6, and is pumped into the evaporator 6 pipe bundle surface by the refrigerant pump 10 to absorb heat and evaporate, the evaporated refrigerant steam enters the absorber 7, and is absorbed by the concentrated solution sprayed on the surface of the absorber 7 pipe bundle in the absorber shower plate to become dilute solution and enter the bottom of the absorber 7. The driving steam supplied by the external system enters the high pressure generator 1 pipe through the heat pump steam electric regulating valve 25, releases heat and condenses into condensate water, the condensate water is heated by the heat pump condensate water heat exchanger 22, and then flows out of the unit from the heat pump condensate outlet 23; the waste hot water enters the evaporator 6 pipe through the waste hot water inlet 8, releases heat and cools down, and then flows out of the unit through the waste hot water outlet 5; the hot water is divided into two ways from the hot water inlet 9, one way enters the absorber 7 pipe to absorb heat and heat up, the other way enters the heat pump condensate water heat exchanger 22 to absorb heat and heat up, and the hot water is combined together and then enters the condenser 3 pipe to absorb heat and heat up further, and then flows out of the unit through the hot water outlet 4. The unit continuously circulates and recovers the waste hot water heat to produce hot water for users.

[0024] In addition to the above embodiments, the present application also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present application.

Claims

1. A lithium bromide absorption unit capable of dual-effect refrigeration and single-effect heating, comprising a high-pressure generator, a low-pressure generator, a condenser, an evaporator, an absorber, a high-temperature heat exchanger, a low-temperature heat exchanger, a refrigeration condensate heat exchanger, a high-pressure dilute solution pump, a low-pressure dilute solution pump, and a refrigerant pump, wherein the lithium bromide absorption unit is a steam dual-effect lithium bromide absorption chiller unit with solution parallel circulation, and is characterized in that: a heat pump generator is further arranged in a cylinder of the low-pressure generator and the condenser, the heat pump generator is arranged between the low-pressure generator and the condenser, the heat pump generator and the condenser are separated by a liquid blocking plate group, the low-pressure generator and the heat pump generator share a concentrated solution capsule and a concentrated solution pipeline, and the heat pump generator is separately provided with a heat pump condensate heat exchanger; in summer, the heat pump generator and the heat pump condensate heat exchanger stop running when the lithium bromide absorption unit operates in a dual-effect refrigeration mode according to a solution parallel circulation process; and in winter, the high-pressure generator, the low-pressure generator, the high-temperature heat exchanger, and the refrigeration condensate heat exchanger stop running when the lithium bromide absorption unit operates in a single-effect heating mode according to a circulation process.

2. The lithium bromide absorption unit according to claim 1, wherein hot water enters the heat pump condensate heat exchanger through a hot water inlet heat pump condensate heat exchanger pipeline, a hot water switching valve D is arranged on the hot water inlet heat pump condensate heat exchanger pipeline, a dilute solution communication pipe is arranged between pipelines at outlets of the high-pressure dilute solution pump and the low-pressure dilute solution pump, a dilute solution switching valve A is arranged on the dilute solution communication pipe, a dilute solution switching valve B is arranged on a dilute solution pipeline before entering the high-temperature heat exchanger, a dilute solution pipeline from the refrigeration condensate heat exchanger is divided into two branches, one branch is a low-pressure generator liquid inlet pipeline, and a dilute solution switching valve E is arranged on the low-pressure generator liquid inlet pipeline; the other branch is a heat pump generator liquid inlet pipeline, and a dilute solution switching valve F is arranged on the heat pump generator liquid inlet pipeline; a refrigerant water regulating valve G is arranged on a refrigerant water U-shaped pipe through which condenser refrigerant water enters the evaporator; a cooling water switching valve H is arranged on a cooling water pipeline through which cooling water enters the condenser, a cooling water switching valve I is arranged on a cooling water pipeline from the absorber, and a hot water switching valve J is arranged on a hot water pipeline from the absorber and to the condenser.

3. The lithium bromide absorption unit according to claim 1, wherein in summer, a refrigeration steam electric regulating valve, the dilute solution switching valve A, the hot water switching valve D, the dilute solution switching valve F, and the hot water switching valve J are closed, a refrigeration steam electric regulating valve, the dilute solution switching valve B, the dilute solution switching valve E, the refrigerant water regulating valve G, the cooling water switching valve H, and the cooling water switching valve I are opened, and an opening degree of a high-temperature refrigerant water throttling valve K is adjusted according to refrigeration operation requirements.

4. The lithium bromide absorption unit according to claim 1 or 3, wherein the dual-effect refrigeration working process is that the high-pressure dilute solution pump lifts part of the dilute solution, the dilute solution is heated by the high-temperature heat exchanger, enters the high-pressure generator shell, is concentrated into high-pressure concentrated solution by the driving steam in the high-pressure generator tube bundle, and high-temperature refrigerant steam is generated at the same time, the high-pressure concentrated solution is cooled by the high-temperature heat exchanger, flows into the absorber shower plate, and the high-temperature refrigerant steam is condensed into high-temperature refrigerant water by releasing heat in the low-pressure generator tube bundle.

2. The lithium bromide absorption unit of claim 1, wherein: ​ ​ ​ ​ ​ 3. The lithium bromide absorption unit of claim 2, wherein: ​ ​ ​ The low-pressure dilute solution pump lifts part of the dilute solution to the low-temperature heat exchanger and then to the condenser heat exchanger for heating, and then the heated dilute solution enters the low-pressure generator tray and is sprayed on the surface of the low-pressure generator tube bundle to absorb heat and be concentrated into low-pressure concentrated solution, while low-temperature refrigerant steam is generated; The low-pressure concentrated solution is cooled by the low-temperature heat exchanger and flows into the absorber tray, and the low-temperature refrigerant steam passes through the liquid blocking plate group and enters the condenser to release heat and condense into refrigerant water; the high-temperature refrigerant water is throttled by the high-temperature refrigerant water throttle valve K and then enters the bottom of the condenser to flash and then flows together with the condensed refrigerant water in the condenser to the evaporator through the refrigerant water regulating valve G on the refrigerant water U-shaped pipe; the unflashed refrigerant water enters the bottom of the evaporator, is pumped by the refrigerant pump to the surface of the evaporator tube bundle to absorb heat and evaporate, and the evaporated refrigerant steam enters the absorber and is absorbed by the concentrated solution sprayed on the surface of the absorber tube bundle to become dilute solution and enter the bottom of the absorber.

5. The lithium bromide absorption unit of claim 4, wherein: The driving steam supplied by the external system enters the high-pressure generator tube through the refrigeration steam electric regulating valve and releases heat to condense into condensate water, which is cooled by the refrigeration condensate heat exchanger and then flows out of the unit from the refrigeration condensate outlet; The cold water enters the evaporator tube through the cold water inlet and releases heat to cool down, and then flows out of the unit through the cold water outlet; the cooling water enters the absorber and condenser tubes in parallel through the cooling water inlet and absorbs heat to warm up, and then flows out of the unit through the cooling water outlet.

6. A lithium bromide absorption unit capable of dual-effect refrigeration and single-effect heating according to claim 2, characterized in that: During winter heating, the refrigeration steam electric regulating valve, the dilute solution switching valve B, the dilute solution switching valve E, the cooling water switching valve H, the cooling water switching valve I and the high-temperature refrigerant water throttle valve K are closed; the heat pump steam electric regulating valve, the dilute solution switching valve A, the hot water switching valve D, the dilute solution switching valve F and the hot water switching valve J are opened, and the refrigerant water regulating valve G opening degree is adjusted according to the heat pump operating state.

7. The lithium bromide absorption unit of claim 1 or 6, wherein: The single-effect heating working process is: the high-pressure dilute solution pump and the low-pressure dilute solution pump are connected in parallel to simultaneously lift the dilute solution, the dilute solution is heated by the low-temperature heat exchanger and flows through the refrigeration condensate heat exchanger to enter the heat pump generator liquid distribution pipe and then the heat pump generator tray, the dilute solution is sprayed on the surface of the heat pump generator tube bundle to absorb the heat of the driving steam and become concentrated solution, the concentrated solution is cooled by the low-temperature heat exchanger and flows into the absorber tray; The refrigerant steam generated by the heat pump generator concentrated solution enters the condenser through the liquid blocking plate group to release heat and condense into refrigerant water, which is throttled by the refrigerant water regulating valve G and then enters the evaporator to flash, the unflashed refrigerant water enters the bottom of the evaporator, is pumped by the refrigerant pump to the surface of the evaporator tube bundle to absorb heat and evaporate, and the evaporated refrigerant steam enters the absorber and is absorbed by the concentrated solution sprayed on the surface of the absorber tube bundle to become dilute solution and enter the bottom of the absorber.

8. A lithium bromide absorption unit capable of dual-effect refrigeration and single-effect heating according to claim 7, characterized in that: The driving steam supplied by the external system enters the high-pressure generator tube through the heat pump steam electric regulating valve and releases heat to condense into condensate water, which is cooled by the heat pump condensate heat exchanger and then flows out of the unit from the heat pump condensate outlet; The residual hot water enters the evaporator tube through the residual hot water inlet, releases heat to cool down, and then flows out of the unit through the residual hot water outlet; The hot water from the hot water inlet is divided into two paths, one path enters the tube side of the absorber to absorb heat and increase temperature, and the other path enters the condenser water heat exchanger for heat absorption and temperature increase, the hot water from the two paths is combined and then enters the tube side of the condenser to absorb heat and further increase temperature, and then flows out of the unit through the hot water outlet.

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