Single-effect and double-effect refrigerating and single-effect heating type composite energy lithium bromide unit

Abstract

The utility model belongs to the technical field of air conditioning units, and discloses a single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit. Comprising an evaporator; the evaporator, the absorber A and the absorber B are arranged in one barrel, and the low-temperature regenerator A, the condenser A and the low-temperature regenerator B are arranged in one barrel; the top of an evaporator is connected with a condenser A, the evaporator is connected with a condenser B, and an absorber A is sequentially connected with a low-temperature heat exchanger A, a high-temperature heat exchanger, a high-temperature regenerator and a low-temperature regenerator B; the low-temperature regenerator B is connected with the low-temperature heat exchanger A, and the absorber A is connected with the absorber B; the high-temperature regenerator is sequentially connected with the condenser B, the plate heat exchanger and the low-temperature regenerator A; the absorber A and the absorber B are connected with the condenser B; the condenser B is connected with the high-temperature regenerator, and the bottom of the absorber B is sequentially connected with the top of the low-temperature heat exchanger B and the top of the low-temperature regenerator A. The single-effect and double-effect refrigerating and single-effect heating type composite energy lithium bromide unit meets the requirements of refrigerating and heating at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning units, and relates to a single-double effect refrigeration and single effect heating composite energy lithium bromide unit. Background Technique

[0002] In recent years, with the increasing efforts on energy conservation and emission reduction and the gradual deepening of domestic demand expansion, the impact of information technology on heat networks and industrial sectors has gradually increased. Driven by the background of "dual carbon", with the increasingly prominent energy and environmental problems, lithium bromide absorption refrigerators use thermal energy as power, water as refrigerant, and lithium bromide solution as absorbent to produce cooling capacity above 0°C. Its potential in energy conservation and environmental protection has been widely recognized. Especially in the case of limited power supply or the need to utilize waste heat, waste heat, solar energy and other renewable energy sources, it has unique advantages. As a cold source for air conditioning or production process, due to its advantages of low power consumption, non-toxic, pollution-free, no explosion hazard, safe and reliable, and convenient unit maintenance and management, it is more and more widely used in the fields of air conditioning, process refrigeration, etc. With the diversification of heat sources and demands at customers, more and more users have high-quality hot water while having steam. There is a demand for sanitary hot water while cooling in summer. Existing lithium bromide units only have separate heat source refrigeration or heating, and cannot meet the demand for composite energy to refrigerate and heat simultaneously. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the above background technique and provide a single-double effect refrigeration and single effect heating composite energy lithium bromide unit. The unit mainly uses steam and warm water as heat sources, and can not only refrigerate in single effect, but also refrigerate in double effect, that is, it can heat in single effect, and can also be a composite unit that uses steam or hot water for separate heating. It can meet the demand for composite energy to refrigerate and heat simultaneously, fill the industry gap, and better meet the needs of users.

[0004] The purpose of the utility model is to provide a single-double effect refrigeration and single effect heating composite energy lithium bromide unit that can simultaneously meet the user's demands for refrigeration and heating, and can meet the demands for simultaneous refrigeration and heating when the user has different heat sources.

[0005] The technical solution adopted by the present utility model to solve its technical problems is as follows: a single-double effect refrigeration and single effect heating composite energy lithium bromide unit, which includes an evaporator, absorber A, absorber B, low-temperature regenerator A, condenser A, and low-temperature regenerator B; the evaporator, absorber A, and absorber B are arranged in a cylinder, and the low-temperature regenerator A, condenser A, and low-temperature regenerator B are arranged in a cylinder; the top of the evaporator is connected to condenser A, the evaporator is connected to condenser B, absorber A is sequentially connected to low-temperature heat exchanger A, high-temperature heat exchanger, high-temperature regenerator, and low-temperature regenerator B; the lower side of the low-temperature heat exchanger A is connected to the top of absorber A, the low-temperature regenerator B is connected to the low-temperature heat exchanger A, and absorber A is connected to absorber B; the high-temperature regenerator is sequentially connected to condenser B, plate heat exchanger, and low-temperature regenerator A; absorber A and absorber B are connected to condenser B; condenser B is connected to the high-temperature regenerator, the bottom of absorber B is sequentially connected to the low-temperature heat exchanger B and the top of the low-temperature regenerator A, and the bottom of the low-temperature regenerator A is sequentially connected to the low-temperature heat exchanger B and the top of absorber B.

[0006] The outlet of the evaporator is connected to the inlet at the top of the evaporator through pipeline A, and a refrigerant pump is provided on pipeline A. The top of the evaporator is connected to condenser B through pipeline B, and a butterfly valve R is provided on pipeline B.

[0007] The bottom of absorber A is connected to the low-temperature heat exchanger A through pipeline C, and a circulation pump B is provided on pipeline C.

[0008] The top of the high-temperature heat exchanger is connected to the upper part of the high-temperature regenerator through pipeline D, and a butterfly valve G is provided on pipeline D.

[0009] The lower part of the high-temperature regenerator is connected to the low-temperature regenerator B through pipeline E, and a butterfly valve P is provided on pipeline E.

[0010] The lower side of the low-temperature heat exchanger A is connected to the top of absorber A through pipeline F, and a circulation pump C and a butterfly valve C are provided on pipeline F.

[0011] The side of the high-temperature heat exchanger is connected to the side of the low-temperature heat exchanger A through pipeline G, and a butterfly valve D is provided on pipeline G.

[0012] Pipeline F and pipeline G are connected through pipeline H, and a butterfly valve E is provided on pipeline H.

[0013] A butterfly valve H is provided on pipeline I connecting absorber A and absorber B.

[0014] The bottom of the high-temperature regenerator is connected to the side of the high-temperature heat exchanger through pipeline J, and a butterfly valve F is provided on pipeline J.

[0015] The top of the high-temperature regenerator is connected to the side of condenser B through pipeline K, and a butterfly valve N is provided on pipeline K.

[0016] The lower part of condenser B is connected to the bottom of the high-temperature regenerator through pipeline L, and a butterfly valve Q is provided on the pipeline L.

[0017] Pipeline I is connected to condenser B through pipeline M, and a 25-butterfly valve I and a butterfly valve O are provided on the pipeline M; the butterfly valve O is arranged inside condenser B.

[0018] The bottom of absorber A is connected to low-temperature heat exchanger B through pipeline N, and a circulation pump A is provided on the pipeline N.

[0019] Absorber A and absorber B are also respectively connected to the cooling water inlet pipeline A, and a cooling water inlet A is provided on the cooling water inlet pipeline A; a butterfly valve B is provided on the branch pipeline where the cooling water inlet pipeline A is connected to absorber A, and a butterfly valve A is provided on the branch pipeline where the cooling water inlet pipeline A is connected to absorber B.

[0020] The bottom of condenser A is connected to the top of the evaporator through a pipeline.

[0021] Pipeline I is externally connected to branch pipeline A, and sequentially connects condenser B and the cooling water outlet pipeline A through the branch pipeline A, and a cooling water outlet A is provided on the cooling water outlet pipeline A.

[0022] The bottom of low-temperature regenerator B and the side of low-temperature heat exchanger A are connected through a pipeline and pipeline G, and the end of the pipeline is connected to pipeline G.

[0023] The evaporator is also respectively connected to the cold water inlet pipeline and the cold water outlet pipeline; a cold water inlet is provided on the cold water inlet pipeline; a cold water outlet is provided on the cold water outlet pipeline.

[0024] The high-temperature regenerator is also respectively connected to the steam inlet pipeline and the steam outlet pipeline; a steam inlet is provided on the steam inlet pipeline; a steam outlet is provided on the steam outlet pipeline.

[0025] Condenser B is also respectively connected to the cooling water inlet pipeline B and the cooling water outlet pipeline B; a cooling water inlet B is provided on the cooling water inlet pipeline B; a cooling water outlet B is provided on the cooling water outlet pipeline B.

[0026] Condenser B is connected to the plate heat exchanger through two closed pipelines, and a butterfly valve L and a butterfly valve M are provided on one of the connecting pipelines.

[0027] The plate heat exchanger is connected to low-temperature regenerator A through two closed pipelines. A butterfly valve J and a butterfly valve K are provided on one of the connecting pipelines and this pipeline is also connected to the hot water inlet pipeline, and the other pipeline is connected to the hot water outlet pipeline. A hot water inlet is provided on the hot water inlet pipeline; a hot water outlet is provided on the hot water outlet pipeline.

[0028] The single-effect and double-effect refrigeration and single-effect heating composite energy lithium bromide unit is also provided with a PLC control system. The evaporator, absorber A, absorber B, low-temperature regenerator A, condenser A, low-temperature regenerator B, plate heat exchanger, condenser B, high-temperature regenerator, low-temperature heat exchanger A, high-temperature heat exchanger, low-temperature heat exchanger B, circulating pump A, circulating pump B, refrigerant pump, circulating pump C, butterfly valve A, butterfly valve B, butterfly valve C, butterfly valve D, butterfly valve E, butterfly valve F, butterfly valve G, butterfly valve H, butterfly valve I, butterfly valve J, butterfly valve K, butterfly valve L, butterfly valve M, butterfly valve N, butterfly valve O, butterfly valve P, butterfly valve Q, butterfly valve R are respectively connected to the PLC control system, and are not limited to a specific model, as long as their working functions are realized.

[0029] The evaporator, absorber A, and absorber B are placed in the same cylinder, and the low-temperature regenerator A, condenser A, and low-temperature regenerator B are placed in one cylinder. The absorber B enters the low-temperature regenerator A through the circulating pump A and the low-temperature heat exchanger B, and then enters the absorber B from the low-temperature regenerator A through the low-temperature heat exchanger B; the water in the evaporator enters the evaporator through the refrigerant pump, and the cooling water flows out from the cooling water inlet A through the butterfly valve A, the absorber B, and the condenser A. The steam generated by the low-temperature regenerator A enters the condenser A and then enters the evaporator. This process realizes single-effect refrigeration.

[0030] The solution passes through the low-temperature heat exchanger A from the absorber A in two processes. One of them passes through the high-temperature heat exchanger through the butterfly valve G and enters the high-temperature regenerator. From the high-temperature regenerator, it passes through the butterfly valve F, the high-temperature heat exchanger, and the butterfly valve D. The second process enters the low-temperature regenerator B. The solution from the low-temperature regenerator B merges with the solution from the butterfly valve D and enters the low-temperature heat exchanger A. After passing through the circulating pump C and the butterfly valve C, it enters the absorber A. The cooling water flows out from the cooling water inlet A through the butterfly valve B, the absorber A, the butterfly valve H, and the condenser A. The steam generated by the high-temperature regenerator enters the low-temperature regenerator B through the butterfly valve Q. The generated water vapor enters the condenser A and then enters the evaporator. Through this process, a double-effect refrigeration solution cycle is realized.

[0031] The solution flows from absorber A through low-temperature heat exchanger A, high-temperature heat exchanger, butterfly valve G, and enters high-temperature regenerator. From high-temperature regenerator, butterfly valve F, high-temperature heat exchanger, butterfly valve E, and enters absorber A. Cooling water flows from cooling water inlet A through butterfly valve B, absorber A, butterfly valve I, butterfly valve O, and condenser B before flowing out. Steam generated by high-temperature regenerator flows through butterfly valve N and enters condenser B. Water then flows from condenser B through butterfly valve R and enters evaporator. This process realizes single-effect heating solution circulation.

[0032] The plate heat exchanger and the condenser B are placed side by side. The hot water inlet is divided into two processes and enters the low-temperature regenerator A and the plate heat exchanger through the butterfly valves J and K respectively. After being aggregated, it is discharged through the hot water outlet, realizing the simultaneous refrigeration and heating effects of hot water.

[0033] The heat source steam enters the high-temperature regenerator through the steam inlet, heats the internal solution, and the generated water vapor enters the condenser B through the butterfly valve N. After being condensed by the cooling water from the cooling water inlet B, it returns to the high-temperature regenerator through the butterfly valve Q. At the same time, the cooling water from the cooling water inlet B enters the condenser B through the butterfly valve M, absorbs heat and then passes through the cooling water outlet B to supply the user side, realizing the simultaneous refrigeration and heating effects of steam.

[0034] The unit provided by the present utility model has the following characteristics:

[0035] 1. A single unit uses one evaporator to realize the operation of refrigeration and heating conditions.

[0036] 2. The condenser A and the evaporator can be shared during single-effect and double-effect refrigeration.

[0037] 3. The condenser B can be shared under the conditions of single-effect absorption heat pump and single-effect absorption heating.

[0038] 4. A single unit uses two absorbers, two condensers, and two regenerators to meet the simultaneous refrigeration and heating requirements.

[0039] 5. When there is a demand for both refrigeration and heating at the same time, the plate heat exchanger or the high-temperature regenerator can be used for heat exchange. At this time, whether the user has hot water or steam, the use requirements can be met.

[0040] The beneficial effects of the present utility model compared with the prior art are:

[0041] The heat source used by the unit provided by the present utility model is steam or hot water. It can use hot water as the heat source for single-effect refrigeration, or use steam as the heat source for double-effect refrigeration. It can use high-grade steam as the heat source to produce 60 - 70 °C hot water with the evaporator, absorber A, condenser B, and high-temperature regenerator. It can also use low-grade steam to heat the lithium bromide solution to generate water vapor and exchange heat with the condenser B to produce hot water. It can also use hot water to exchange heat with the plate heat exchanger to produce hot water, achieving the effect of five functions in one machine. Description of the Drawings

[0042] The present utility model will be further described below with reference to the drawings and embodiments:

[0043] Figure 1 It is a schematic diagram of a single / double-effect refrigeration and single-effect heating type composite energy lithium bromide unit of the present utility model.

[0044] In the figure: 1 - evaporator, 2 - absorber A, 3 - absorber B, 4 - low-temperature regenerator A, 5 - condenser A, 6 - low-temperature regenerator B, 7 - plate heat exchanger, 8 - condenser B, 9 - high-temperature regenerator, 10 - low-temperature heat exchanger A, 11 - high-temperature heat exchanger, 12 - low-temperature heat exchanger B, 13 - circulation pump A, 14 - circulation pump B, 15 - refrigerant pump, 16 - circulation pump C, 17 - butterfly valve A, 18 - butterfly valve B, 19 - butterfly valve C, 20 - butterfly valve D, 21 - butterfly valve E, 22 - butterfly valve F, 23 - butterfly valve G, 24 - butterfly valve H, 25 - butterfly valve I, 26 - butterfly valve J, 27 - butterfly valve K, 28 - butterfly valve L, 29 - butterfly valve M, 30 - butterfly valve N, 31 - butterfly valve O, 32 - cooling water inlet A, 33 - cold water inlet, 34 - cold water outlet, 35 - cooling water outlet A, 36 - steam inlet, 37 - steam outlet, 38 - cooling water inlet B, 39 - cooling water outlet B, 40 - hot water outlet, 41 - hot water inlet, 42 - butterfly valve P, 43 - butterfly valve Q, 44 - butterfly valve R. Detailed implementation mode

[0045] The heat source used by the unit is steam or hot water. It can use hot water as the heat source for single-effect refrigeration, or use steam as the heat source for double-effect refrigeration. It can use high-grade steam as the heat source to produce 60 - 70°C hot water with the evaporator, absorber A, condenser B, and high-temperature regenerator, or use low-grade steam to heat the lithium bromide solution to generate water vapor and exchange heat with condenser B to produce hot water. It can also use hot water to exchange heat with the plate heat exchanger to produce hot water, achieving the effect of five functions in one machine.

[0046] Embodiment 1

[0047] A single / double-effect refrigeration and single-effect heating composite energy lithium bromide unit, as Figure 1As shown in the figure, it includes an evaporator 1, an absorber A 2, an absorber B 3, a low-temperature regenerator A 4, a condenser A 5, and a low-temperature regenerator B 6; the evaporator 1, the absorber A 2, and the absorber B 3 are arranged in a cylinder, and the low-temperature regenerator A 4, the condenser A 5, and the low-temperature regenerator B 6 are arranged in a cylinder; the top of the evaporator 1 is connected to the condenser A 5, the evaporator 1 is connected to the condenser B 8, and the absorber A 2 is sequentially connected to a low-temperature heat exchanger A 10, a high-temperature heat exchanger 11, a high-temperature regenerator 9, and a low-temperature regenerator B 6; the lower side of the low-temperature heat exchanger A 10 is connected to the top of the absorber A 2, the low-temperature regenerator B 6 is connected to the low-temperature heat exchanger A 10, and the absorber A 2 is connected to the absorber B 3; the high-temperature regenerator 9 is sequentially connected to the condenser B 8, a plate heat exchanger 7, and the low-temperature regenerator A 4; the absorber A 2 and the absorber B 3 are connected to the condenser B 8; the condenser B 8 is connected to the high-temperature regenerator 9, the bottom of the absorber B 3 is sequentially connected to the top of a low-temperature heat exchanger B 12 and the low-temperature regenerator A 4, and the bottom of the low-temperature regenerator A 4 is sequentially connected to the top of the low-temperature heat exchanger B 12 and the absorber B 3.

[0048] The outlet of the evaporator 1 is connected to the inlet at the top of the evaporator 1 through a pipeline A, and a refrigerant pump 15 is arranged on the pipeline A. The top of the evaporator 1 is connected to the condenser B 8 through a pipeline B, and a butterfly valve R 44 is arranged on the pipeline B.

[0049] The bottom of the absorber A 2 is connected to the low-temperature heat exchanger A 10 through a pipeline C, and a circulation pump B 14 is arranged on the pipeline C.

[0050] The top of the high-temperature heat exchanger 11 is connected to the upper part of the high-temperature regenerator 9 through a pipeline D, and a butterfly valve G 23 is arranged on the pipeline D.

[0051] The lower part of the high-temperature regenerator 9 is connected to the low-temperature regenerator B 6 through a pipeline E, and a butterfly valve P 42 is arranged on the pipeline E.

[0052] The lower side of the low-temperature heat exchanger A 10 is connected to the top of the absorber A 2 through a pipeline F, and a circulation pump C 16 and a butterfly valve C 19 are arranged on the pipeline F.

[0053] The side of the high-temperature heat exchanger 11 is connected to the side of the low-temperature heat exchanger A 10 through a pipeline G, and a butterfly valve D 20 is arranged on the pipeline G.

[0054] The pipeline F and the pipeline G are connected through a pipeline H, and a butterfly valve E 21 is arranged on the pipeline H.

[0055] The absorber A 2 and the absorber B 3 are connected through a pipeline I, and a butterfly valve H 24 is arranged on the pipeline I.

[0056] The bottom of the high-temperature regenerator 9 is connected to the side of the high-temperature heat exchanger 11 through a pipeline J, and a butterfly valve F22 is provided on the pipeline J.

[0057] The top of the high-temperature regenerator 9 is connected to the side of the condenser B 8 through a pipeline K, and a butterfly valve N30 is provided on the pipeline K.

[0058] The lower part of the condenser B 8 is connected to the bottom of the high-temperature regenerator 9 through a pipeline L, and a butterfly valve Q43 is provided on the pipeline L.

[0059] The pipeline I is connected to the condenser B 8 through a pipeline M, and a butterfly valve I 25 and a butterfly valve O 31 are provided on the pipeline M; the butterfly valve O 31 is arranged inside the condenser B 8.

[0060] The bottom of the absorber A2 is connected to the low-temperature heat exchanger B 6 through a pipeline N, and a circulation pump A13 is provided on the pipeline N.

[0061] The absorber A 2 and the absorber B 3 are also respectively connected to the cooling water inlet pipeline A, and a cooling water inlet A 32 is provided on the cooling water inlet pipeline A; a butterfly valve B18 is provided on the branch pipeline where the cooling water inlet pipeline A is connected to the absorber A 2, and a butterfly valve A17 is provided on the branch pipeline where the cooling water inlet pipeline A is connected to the absorber B 3.

[0062] The bottom of the condenser A 5 is connected to the top of the evaporator 1 through a pipeline.

[0063] The pipeline I is externally connected to a branch pipeline A, and is sequentially connected to the condenser B 8 and the cooling water outlet pipeline A through the branch pipeline A, and a cooling water outlet A 35 is provided on the cooling water outlet pipeline A.

[0064] The bottom of the low-temperature regenerator B 6 and the side of the low-temperature heat exchanger A10 are connected through a pipeline and a pipeline G, and the end of the pipeline is connected to the pipeline G.

[0065] The evaporator 1 is also respectively connected to a cold water inlet pipeline and a cold water outlet pipeline; a cold water inlet 33 is provided on the cold water inlet pipeline; a cold water outlet 34 is provided on the cold water outlet pipeline.

[0066] The high-temperature regenerator 9 is also respectively connected to a steam inlet pipeline and a steam outlet pipeline; a steam inlet 36 is provided on the steam inlet pipeline; a steam outlet 37 is provided on the steam outlet pipeline.

[0067] The condenser B 8 is also respectively connected to a cooling water inlet pipeline B and a cooling water outlet pipeline B; a cooling water inlet B 38 is provided on the cooling water inlet pipeline B; a cooling water outlet B 39 is provided on the cooling water outlet pipeline B.

[0068] The condenser B 8 and the plate heat exchanger 7 are connected in a closed loop through two pipelines, and a butterfly valve L28 and a butterfly valve M 29 are arranged on one of the connecting pipelines.

[0069] The plate heat exchanger 7 and the low-temperature regenerator A 4 are connected in a closed loop through two pipelines. A butterfly valve J26 and a butterfly valve K 27 are arranged on one of the connecting pipelines, and this pipeline is also connected to the hot water inlet pipeline. The other pipeline is connected to the hot water outlet pipeline. A hot water inlet 41 is arranged on the hot water inlet pipeline; a hot water outlet 40 is arranged on the hot water outlet pipeline.

[0070] During specific operation:

[0071] When the unit realizes absorption single-effect refrigeration, the evaporator 1, the absorber 3, the low-temperature regenerator A 4, and the condenser A 5 are used. Hot water enters the low-temperature regenerator A 4 from the hot water inlet 41 to heat the solution. The butterfly valve K 27 is closed. Cold water enters from the cold water inlet 33 and exits from the cold water outlet 34. Cooling water enters from the cooling water inlet A 32. The butterfly valve B18 is closed, and the butterfly valve A17 is opened. The cooling water enters the absorber 3. The butterfly valve H24 is closed, and the cooling water enters the condenser A 5. The cooling water flows out from the cooling water outlet A 35. The solution in the absorber 3 sequentially passes through the circulation pump A 13 and the low-temperature heat exchanger B 12 and enters the low-temperature regenerator A 4, where it drips outside the heat exchange tubes. The hot water entering from the hot water inlet 40 heats the solution, and the solution becomes a concentrated solution. The concentrated solution passes through the low-temperature heat exchanger B 12 and drips on the heat exchange tubes of the absorber B 3. After absorbing the water vapor evaporated from the evaporator 1, it becomes a dilute solution and then reciprocates through the circulation pump A 13. The water vapor in the solution is heated and evaporated, enters the condenser A 5, is cooled by the cooling water to become chilled water, and then enters the evaporator 1. The chilled water is transported to the upper part by the refrigerant pump 15 and drips down through the heat exchange tubes, evaporating and absorbing heat in the evaporator 1, reducing the temperature of the cold water in the evaporator 1 and achieving the single-effect refrigeration effect.

[0072] When the unit realizes absorption double-effect refrigeration, the evaporator 1, absorber B3, low-temperature heat exchanger A10, high-temperature heat exchanger 11, low-temperature regenerator B6, plate heat exchanger 7, and high-temperature regenerator 9 are used for heat exchange with each other. The heat source enters from the steam inlet 36 and exits from the steam outlet 37. The chilled water enters from the chilled water inlet 33 and exits from the chilled water outlet 34. The cooling water enters from the cooling water inlet A 32. After the butterfly valve B18 is opened and the butterfly valve A17 is closed, the butterfly valve H24 is opened and it enters the condenser A5, and flows out through the cooling water outlet A 35. The solution flows from the absorber 2, passes through the circulation pump B14 and the low-temperature heat exchanger A10, and then is divided into two paths. One path passes through the high-temperature heat exchanger 11 and the butterfly valve G23 and enters the high-temperature regenerator 9, where it is heated by the high-temperature steam and becomes a solution with an intermediate concentration. It passes through the butterfly valve F22, the high-temperature heat exchanger 11 to the butterfly valve D20. The butterfly valve E21 is closed. The heated steam closes the butterfly valve N30 and enters the low-temperature regenerator B6 through the pipeline. The other path directly enters the low-temperature regenerator B6 after passing through the low-temperature heat exchanger 10. The solution is heated by the steam from the high-temperature regenerator 9 and also becomes a solution with an intermediate concentration. After the intermediate-concentration solution flows down, it mixes with the solution flowing through the butterfly valve D20, and they enter the low-temperature heat exchanger 10 together. The solution coming out becomes a concentrated solution, passes through the circulation pump C16 and the butterfly valve C19, and enters the absorber A 2 to absorb the water vapor evaporated from the evaporator 1 and becomes a dilute solution, and then circulates reciprocally through the circulation pump A13. The steam generated by the solution that is reheated in the low-temperature regenerator B6 enters the condenser A5, is cooled by the cooling water, enters the evaporator 1, and then enters the evaporator 1 through the refrigerant pump 15 for dripping, absorbing the heat of the chilled water to achieve the double-effect refrigeration effect.

[0073] When the unit realizes the heating of the absorption single-effect heat pump, the evaporator 1, absorber B3, condenser B8, and regenerator 9 are used. The heat source enters from the steam inlet 36 and exits from the steam outlet 37. The chilled water enters from the chilled water inlet 33 and exits from the chilled water outlet 34. The cooling water enters from the cooling water inlet A32. After the butterfly valve B18 is opened, the butterfly valve A17 is closed, the butterfly valve H24 is closed, the butterfly valve I25 is opened, the butterfly valve O31 is opened, and the butterfly valves L28 and M29 are closed, the cooling water flows out from the cooling water outlet B39. The solution flows out from the absorber A2, passes through the circulation pump B14, the low-temperature heat exchanger A10, the high-temperature heat exchanger 11, the butterfly valve G23, and enters the high-temperature regenerator 9, where it is heated by the high-temperature steam from the steam inlet 36 to become a medium-concentration solution. The solution passes through the butterfly valve F22, the high-temperature heat exchanger 11, the butterfly valve E21 is opened, the butterfly valve D20 is closed, and the butterfly valve C19 is closed, and enters the absorber B3. The solution absorbs water vapor and becomes a dilute solution, and reciprocates through the circulation pump B14. The water vapor in the heated heat source enters the condenser B8 through the butterfly valve N30, is cooled into a liquid by the cooling water, and then enters the evaporator 1 through the butterfly valve R44, and the butterfly valve Q43 is closed. Then it enters the evaporator 1 through the refrigerant pump 15 for dripping. Among them, the concentrated solution absorbs water vapor in the absorber A2, releases heat, is absorbed by the cooling water, the temperature of the cooling water rises, enters the condenser B8 to absorb heat again, and finally flows out. After absorbing heat twice, the temperature rises, and finally the heating effect is achieved.

[0074] When the unit realizes the heating of the heat exchanger, the plate heat exchanger 7 is used alone as a heat exchanger. The heat source water enters the plate heat exchanger 7 through the hot water outlet 41. The butterfly valve K27 is opened and the butterfly valve J26 is closed. This part is the high-temperature side. The low-temperature heat enters from the cooling water inlet B38 and flows out from the cooling water outlet B39. The butterfly valve L28 is opened and the butterfly valves M29 and O31 are closed to meet the use requirements of the user side. Among them, the heat exchanger adopts the countercurrent heat exchange method to further improve the use efficiency of the plate heat exchanger.

[0075] When the unit realizes the absorption single-effect heating, the condenser B8 and the high-temperature regenerator 9 are used in combination. First, the butterfly valve F22 is closed. The circulation pump B14 first sends a part of the solution in the absorber A2 to the high-temperature regenerator 9. After about 5 minutes, the circulation pump B14 stops running, and at the same time the butterfly valve G23 is closed to ensure that there is enough solution in the high-temperature regenerator 9 to be heated. The high-temperature steam enters the high-temperature regenerator 9, heats the lithium bromide solution, so that the water vapor enters the condenser B8 through the butterfly valve N30, heats the cooling water from the cooling water inlet B38, and the heated cooling water flows out from the cooling water outlet B39 to meet the user's needs. The condensed steam forms condensate and returns to the high-temperature regenerator 9 through the butterfly valve Q43. The butterfly valve R44 is closed to avoid the loss of refrigerant water, resulting in too high a concentration in the high-temperature regenerator 9 and causing the solution to crystallize.

[0076] The lithium bromide solutions in the absorbers A2 and absorber B3 containers are common to meet the requirements of the unit for the solution quantity under different conditions.

[0077] In the heating mode, different grades of steam are used in different ways. When the steam is of high grade, an absorption heat pump is used for heating to meet the high heat demand of users. When the steam quantity is insufficient or the steam pressure is low, the heat exchange between the condenser B8 and the high-temperature regenerator 9 can be used to meet the heating capacity of low demand.

[0078] When the unit has both high-temperature hot water and steam, single-effect and double-effect refrigeration can be achieved simultaneously. The solutions in the absorbers A2 and absorber B3 can absorb the heat released from the evaporator 1 at the same time. At this time, the refrigerating capacity of the unit is the largest to meet the higher refrigeration demand of users.

[0079] When users have simultaneous requirements for refrigeration and heating, the mode of single-effect refrigeration + heat exchanger heating can be adopted. The evaporator 1, absorber 3, low-temperature regenerator A4, and condenser A5 are used to meet the refrigeration demand, and the plate heat exchanger 7 is used for independent heating to meet the heating demand to meet the requirements simultaneously.

[0080] When the steam pressure or flow rate on the user side is sufficient, the mode of using the double-effect refrigeration condenser B8 and the high-temperature regenerator 9 for heating can be adopted at the same time, which can also meet the user's requirements for cooling and heating. At this time, the butterfly valve N30 and the butterfly valve P42 need to be opened simultaneously. This mode can also consume the excess steam at the user side to achieve the comprehensive requirements of users.

[0081] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A single-effect and double-effect refrigeration and single-effect heating composite energy lithium bromide unit, characterized in that: The invention comprises an evaporator (1), an absorber A (2), an absorber B (3), a low-temperature regenerator A (4), a condenser A (5), and a low-temperature regenerator B (6); the evaporator (1), the absorber A (2), and the absorber B (3) are arranged in a cylinder, and the low-temperature regenerator A (4), the condenser A (5), and the low-temperature regenerator B (6) are arranged in a cylinder; the top of the evaporator (1) is connected to the condenser A (5), the evaporator (1) is connected to the condenser B (8), and the absorber A (2) is connected to the low-temperature heat exchanger A (10), the high-temperature heat exchanger (11), the high-temperature regenerator (9), and the low-temperature regenerator B (6) in sequence; the lower part of the low-temperature heat exchanger A (10) The side surface is connected to the top of the absorber A (2), the low-temperature regenerator B (6) is connected to the low-temperature heat exchanger A (10), and the absorber A (2) is connected to the absorber B (3); the high-temperature regenerator (9) is connected to the condenser B (8), the plate heat exchanger (7), and the low-temperature regenerator A (4) in sequence; the absorber A (2) and the absorber B (3) are connected to the condenser B (8); the condenser B (8) is connected to the high-temperature regenerator (9), the bottom of the absorber B (3) is connected to the low-temperature heat exchanger B (12) and the top of the low-temperature regenerator A (4) in sequence, and the bottom of the low-temperature regenerator A (4) is connected to the low-temperature heat exchanger B (12) and the top of the absorber B (3) in sequence.

2. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The outlet of the evaporator (1) is connected to the inlet at the top of the evaporator (1) through a pipeline A, and a refrigerant pump (15) is provided on the pipeline A; the top of the evaporator (1) is connected to the condenser B (8) through a pipeline B, and a butterfly valve R (44) is provided on the pipeline B; The bottom of the absorber A (2) is connected to the low-temperature heat exchanger A (10) through a pipeline C, and a circulating pump B (14) is arranged on the pipeline C; the top of the high-temperature heat exchanger (11) is connected to the upper part of the high-temperature regenerator (9) through a pipeline D, and a butterfly valve G (23) is arranged on the pipeline D; the lower part of the high-temperature regenerator (9) is connected to the low-temperature regenerator B (6) through a pipeline E, and a butterfly valve P (42) is arranged on the pipeline E; the lower side of the low-temperature heat exchanger A (10) is connected to the top of the absorber A (2) through a pipeline F, and a circulating pump C (16) and a butterfly valve C (19) are arranged on the pipeline F; The side of the high-temperature heat exchanger (11) is connected to the side of the low-temperature heat exchanger A (10) through a pipeline G, and a butterfly valve D (20) is provided on the pipeline G; Pipeline F and pipeline G are connected via pipeline H, and a butterfly valve E (21) is provided on pipeline H.

3. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The bottom of the high-temperature regenerator (9) is connected to the side of the high-temperature heat exchanger (11) through a pipeline J, and a butterfly valve F (22) is provided on the pipeline J; the top of the high-temperature regenerator (9) is connected to the side of the condenser B (8) through a pipeline K, and a butterfly valve N (30) is provided on the pipeline K; the lower part of the condenser B (8) is connected to the bottom of the high-temperature regenerator (9) through a pipeline L, and a butterfly valve Q (43) is provided on the pipeline L.

4. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The bottom of the absorber A (2) is connected to the low-temperature heat exchanger B (12) through a pipeline N, and a circulation pump A (13) is arranged on the pipeline N.

5. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The absorber A (2) and the absorber B (3) are also connected to the cooling water inlet pipeline A respectively. The cooling water inlet pipeline A is provided with a cooling water inlet A (32). A butterfly valve B (18) is provided on the branch pipeline connecting the cooling water inlet pipeline A and the absorber A (2). A butterfly valve A (17) is provided on the branch pipeline connecting the cooling water inlet pipeline A and the absorber B (3).

6. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The absorber A (2) and the absorber B (3) are connected via a pipeline I, on which a butterfly valve H (24) is provided; the pipeline I is externally connected to a branch pipeline A, which is connected to a condenser B (8) and a cooling water outlet pipeline A in sequence via the branch pipeline A, and a cooling water outlet pipeline A (35) is provided on the cooling water outlet pipeline A.

7. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The evaporator (1) is also connected to a cold water inlet pipeline and a cold water outlet pipeline respectively; a cold water inlet (33) is arranged on the cold water inlet pipeline; and a cold water outlet (34) is arranged on the cold water outlet pipeline.

8. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The high-temperature regenerator (9) is also connected to a steam inlet pipeline and a steam outlet pipeline respectively; a steam inlet (36) is arranged on the steam inlet pipeline; and a steam outlet (37) is arranged on the steam outlet pipeline.

9. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The condenser B (8) is also connected to a cooling water inlet pipeline B and a cooling water outlet pipeline B respectively; a cooling water inlet B (38) is arranged on the cooling water inlet pipeline B; and a cooling water outlet B (39) is arranged on the cooling water outlet pipeline B.

10. A single-effect and double-effect refrigeration and single-effect heating type composite energy lithium bromide unit as claimed in claim 1, characterized in that: The condenser B (8) is closedly connected to the plate heat exchanger (7) via two pipelines, one of which is provided with a butterfly valve L (28) and a butterfly valve M (29); The plate heat exchanger (7) and the low-temperature regenerator A (4) are closedly connected via two pipelines, one of which is provided with a butterfly valve J (26) and a butterfly valve K (27) and is also connected to a hot water inlet pipeline, and the other is connected to a hot water outlet pipeline; a hot water inlet (41) is provided on the hot water inlet pipeline; and a hot water outlet (40) is provided on the hot water outlet pipeline.

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