Cold and heat cogeneration type lithium bromide unit

Abstract

The utility model discloses a cold and heat cogeneration type lithium bromide unit. A condenser, a generator, a first absorber and a first evaporator are combined to form an absorption refrigerator, and the condenser, the generator, a second absorber and a second evaporator are combined to form an absorption heat pump; an inlet of the three-way valve is connected with a waste heat source, a first outlet of the three-way valve is connected with a tube pass of the generator, and a second outlet of the three-way valve is connected with a tube pass of the second evaporator; the cooling water pipeline is connected with the tube pass of the condenser and the tube pass of the first absorber; the heating water pipe is communicated with the tube pass of the second absorber; the refrigerating water pipe is connected with the tube pass of the first evaporator; according to the scheme, simultaneous refrigeration and heating of one set of equipment are achieved, and the refrigeration and heating capacity can be adjusted according to customer requirements.

Description

Technical Field

[0001] This scheme involves the field of waste heat recovery, and specifically involves a cooling and heating cogeneration type lithium bromide unit. Background Art

[0002] Waste heat recovery can make full use of limited energy. The second type of absorption heat pump is the main equipment for waste heat recovery, also known as the heating type. It mainly recovers and utilizes low-level heat energy while increasing high-level heat energy to achieve heat transfer and utilization. Its working principle is to achieve heat transfer and utilization by converting low-level heat energy into high-level heat energy. At present, waste heat recovery is divided into two directions:

[0003] Waste heat recovery for heating generally uses a second-type absorption heat pump, which uses a lower temperature to achieve a higher temperature;

[0004] Waste heat recovery refrigeration uses absorption chillers to obtain cold water at 7 degrees Celsius or below;

[0005] The basic working principle is similar. For example, lithium bromide units use the characteristics of lithium bromide absorbing water, releasing heat and having a high boiling point, and adjust the boiling point of water by adjusting the pressure to achieve the transfer and conversion of heat energy. Due to different uses, the working temperature and pressure of each chamber inside are different. Therefore, the existing lithium bromide units can only choose cooling or heating at the same time, and there is no unit that provides cooling and heating at the same time.

[0006] However, users often need to produce high-temperature hot water or steam, and also need to provide low-temperature cold water at the same time to meet the needs of both heating and cooling. However, many customers are limited by site conditions and cannot place multiple units at the same time, and the operating and management costs are also high. Therefore, it has become an urgent issue to solve the refrigeration function of the second-class heat pump unit or the production of high-temperature hot water or steam by the absorption refrigerator. After patent investigation, "A Class II Lithium Bromide Heat Pump Unit for Refrigeration and Heating" CN202320855303.6 has similarities, but it can only choose cooling mode or heating mode, and cannot cool and heat at the same time. Utility Model Content

[0007] The technical problem to be solved by the present invention is to provide a cold and hot cogeneration type lithium bromide unit.

[0008] The specific technical solution of this novel method to solve the above technical problems is:

[0009] A cold and hot cogeneration lithium bromide unit, comprising a condenser, a generator, a first absorber, a second absorber, a first evaporator, and a second evaporator, wherein the condenser, the generator, the first absorber, and the first evaporator are combined into an absorption refrigerator, and the condenser, the generator, the second absorber, and the second evaporator are combined into an absorption heat pump;

[0010] The second absorber and the second evaporator form a second absorption and evaporation group, the first absorber and the first evaporator form a first absorption and evaporation group, and the condenser and the generator form a condensation and generation group;

[0011] It also includes a three-way valve, wherein the inlet of the three-way valve is connected to the waste heat source, the first outlet of the three-way valve is connected to the pipe side of the generator, and the second outlet of the three-way valve is connected to the pipe side of the second evaporator;

[0012] The cooling water pipeline connects the tube side of the condenser and the tube side of the first absorber;

[0013] The hot water pipe is connected to the pipe side of the second absorber, and the refrigeration water pipe is connected to the pipe side of the first evaporator.

[0014] Furthermore, the outlet of the cooling water pipe is provided with a cold water temperature sensor, the outlet of the heating water pipe is provided with a hot water temperature sensor, and also includes a proportional controller, which is used to receive signals from the cold water temperature sensor and the hot water temperature sensor and control the opening of the three-way valve.

[0015] Furthermore, the lithium bromide concentrated solution in the generator is connected to the shell side inlet of the second absorber through a solution pump, the shell side outlet of the second absorber is connected to the shell side inlet of the first absorber, and the shell side outlet of the first absorber returns to the generator through a pipeline.

[0016] Furthermore, the lithium bromide concentrated solution in the generator is connected to the shell side inlet of the first absorber and the shell side inlet of the second absorber respectively through a solution pump, and the shell side outlet of the first absorber and the shell side outlet of the second absorber are connected to the generator through pipelines respectively.

[0017] Furthermore, in terms of spatial arrangement, from top to bottom, there are the second absorption and evaporation group, the condensation generation group, and the first absorption and evaporation group.

[0018] Furthermore, in terms of spatial arrangement, from top to bottom, they are: the second absorption and evaporation group, the first absorption and evaporation group, and the condensation generation group.

[0019] Furthermore, the condenser includes a first condenser and a second condenser which are independent of each other, and the generator includes a first generator and a second generator which are independent of each other, the first condenser and the first generator constitute a first condensation generating group, and the second condenser and the second generator constitute a second condensation generating group; the first condensation generating group and the first absorption evaporation group constitute an absorption heat pump unit, and the second condensation generating group and the second absorption evaporation group constitute an absorption refrigeration unit.

[0020] The control method of the system as described above comprises the following steps:

[0021] S1. Determine a system operating mode, wherein the operating mode is mainly cooling or mainly heating;

[0022] S2. If the main purpose is refrigeration, the outlet temperature of the cooling water is used as the control target, and the liquid level in the first absorber is used as the intermediate control quantity. The liquid level in the first absorber is regulated by adjusting the opening of the three-way valve and the working frequency of the solution pump;

[0023] If heating is the main purpose, the hot water outlet temperature is used as the control target, the liquid level in the second absorber is used as the intermediate control quantity, and the three-way valve opening and the working frequency of the solution pump are adjusted.

[0024] In step S2, if the outlet water temperature of the main demand does not reach the preset target value, that is, the outlet water temperature is higher than the preset target value when cooling is mainly used or the outlet water temperature is lower than the preset target value when heating is mainly used, then it is necessary to increase the cooling capacity or heating capacity of the system, that is, the three-way valve will be adjusted according to the main target temperature, and the working frequency of the solution pump corresponding to the target absorber will also be synchronously adjusted according to the liquid level, so that the pumping amount of the solution pump is adapted to the allocation amount of the heat source by the three-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure and internal circulation of the first embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure and external circulation of the first embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure and internal circulation of the second embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure and external circulation of the second embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure and internal circulation of the third embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure and external circulation of Example 3 of the present invention.

[0031] In the accompanying drawings, the component names represented by the reference numerals are listed as follows:

[0032] A, waste heat source inlet; B, first waste heat source outlet; C, second waste heat source outlet; D, cooling water inlet; E, cooling water outlet; F, hot water inlet; G, hot water outlet; H, refrigeration water inlet; I, refrigeration water outlet; G1, first generator; G2, second generator; C1, first condenser; C2, second condenser; A1, low-temperature absorber; A2, high-temperature absorber; E1, low-temperature evaporator; E2, high-temperature evaporator; 101, first solution pump; 102, low-temperature solution heat exchanger; 103, high-temperature solution heat exchanger; 104, general refrigerant pump; 105, low-pressure refrigerant pump; 106, high-pressure refrigerant pump; 107, second solution pump; 108, solution spray pump; 110, bypass valve; 111, first control valve; 112, second control valve; 201, three-way valve. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] Embodiment 1:

[0035] like Figure 1 , Figure 2 As shown, a cold and hot cogeneration type lithium bromide unit includes a first condenser C1, a first generator G1, a low-temperature absorber A1, a high-temperature absorber A2, a low-temperature evaporator E1, and a high-temperature evaporator E2;

[0036] The low-temperature absorber A1 and the low-temperature evaporator E1 form a first absorption and evaporation group, the high-temperature absorber A2 and the high-temperature evaporator E2 form a second absorption and evaporation group, and the first condenser C1 and the first generator G1 form a first condensation and generation group;

[0037] The first condenser C1, the first generator G1, the low-temperature absorber A1, and the low-temperature evaporator E1 are combined into an absorption refrigerator, and the first condenser C1, the first generator G1, the high-temperature absorber A2, and the high-temperature evaporator E2 are combined into an absorption heat pump;

[0038] In this example, the lithium bromide solution flows in series in the system. Specifically, the first generator G1 absorbs the waste heat source, so that part of the refrigerant (i.e., water) in the refluxed dilute solution is heated to form refrigerant vapor, and the dilute solution loses part of the refrigerant to form a concentrated solution. Subsequently, the concentrated solution is pumped by the first solution pump 101, and after absorbing a certain amount of heat through the high-temperature solution heat exchanger 103, it enters the high-temperature absorber A2. The concentrated solution absorbs the refrigerant vapor in the high-temperature absorber A2 to form an intermediate concentration solution. The process of the lithium bromide solution absorbing the refrigerant vapor in the high-temperature absorber A2 will The intermediate concentration solution releases heat externally, and then releases a certain amount of heat through the high-temperature solution heat exchanger 103 and the low-temperature solution heat exchanger 102, and then enters the low-temperature absorber A1, where it continues to absorb the refrigerant vapor to form a dilute solution. The lithium bromide solution releases heat externally during the process of absorbing the refrigerant vapor in the low-temperature absorber A1. Finally, the dilute solution in the low-temperature absorber A1 is pumped by the solution spray pump 108, releases a certain amount of heat through the low-temperature solution heat exchanger 102, and then returns to the first generator G1 again, completing the internal circulation of the lithium bromide solution.

[0039] A bypass pipe is also provided for allowing the solution to go directly from the high-temperature absorber A2 to the first generator G1, and a bypass valve 110 is provided on the bypass pipe; on the main solution pipe between the high-temperature absorber A2 and the low-temperature absorber A1, a first control valve 111 is also provided after the connection point between the bypass pipe and the main solution pipe.

[0040] The above is the circulation process of lithium bromide solution inside the system. Cooling water pipelines, refrigeration water or hot water and waste heat pipelines are required outside. Specifically, Figure 2 A three-way valve 201 is provided on the outside, and the inlet of the three-way valve 201 is the waste heat source inlet A. The waste heat source is divided into two streams through the three-way valve 201. One stream enters the high-temperature evaporator E2 for heat exchange and is discharged from the first waste heat source outlet B, and the other stream enters the first generator G1 and is discharged from the second waste heat source outlet C. The three-way valve 201 can control the proportion of the waste heat source distributed to the high-temperature evaporator E2 and the first generator G1.

[0041] The cooling water enters the tubes of the first condenser C1 and the low-temperature absorber A1 in sequence, or enters the low-temperature absorber A1 first and then enters the first condenser C1, and is finally discharged from the cooling water outlet E;

[0042] The cold water to be produced enters the tube side of the low-temperature evaporator E1 through the cooling water inlet H, absorbs heat and cools down in the low-temperature evaporator E1, and is discharged from the cooling water outlet I.

[0043] The hot water to be produced enters the tube side of the high-temperature absorber A2 through the hot water inlet F, absorbs the heat released by the lithium bromide solution absorbing the refrigerant steam in the high-temperature absorber A2 to be heated, and then is discharged through the hot water outlet G.

[0044] If the customer has a clear demand for cooling capacity, the opening control of the three-way valve 201 can be interlocked with the temperature of the cold water outlet, thereby controlling the flow of the waste heat source entering the first generator G1. The dilute solution in the first generator G1 forms a concentrated solution under the action of the waste heat source. The concentrated solution needs to enter the high-temperature absorber A2 and the low-temperature absorber A1 in turn, but the flow distribution of the two needs to match the amount of the waste heat source. The liquid level of the low-temperature absorber A1 is controlled by adjusting the operating frequency of the universal solution pump 101 and coordinating the opening adjustment of the bypass valve 110 and the first control valve 111. For example, increasing the operating frequency of the solution pump 101, increasing the opening of the first control valve 111, and closing the opening of the bypass valve 110 can increase the solution circulation volume of the low-temperature absorber A1, thereby matching the input waste heat and increasing the cooling capacity. This can not only meet the cooling capacity demand, but also use the excess waste heat to produce hot water or steam.

[0045] If the customer has a clear demand for producing hot water, the opening control of the three-way valve 201 can be linked to the temperature of the hot water outlet (when used as a heat pump, the output can be either hot water or steam. In this case, the output is hot water. If the output is steam, it is associated with the flow rate of steam at the outlet end). The flow rate of the waste heat source entering the high-temperature evaporator E2 is controlled. The liquid refrigerant forms refrigerant vapor in the high-temperature evaporator E2. The refrigerant vapor is absorbed by the high-temperature absorber A2 to release heat to produce high-temperature hot water or steam. The concentrated solution in the first generator G1 needs to enter the low-temperature absorber A1 and the low-temperature absorber A2 respectively. and the high-temperature absorber A2, the flow distribution between the two needs to be controlled by the universal solution pump 101 frequency conversion control, coordinated with the opening adjustment of the bypass valve 110 and the first control valve 111, to realize the control of the liquid level of the high-temperature absorber A2. For example, increasing the working frequency of the solution pump 101, closing the opening of the first control valve 111, and increasing the opening of the bypass valve 110 can increase the solution circulation volume of the high-temperature absorber A2, thereby matching the input waste heat and increasing the heating capacity. In this way, the demand for high-temperature hot water or steam production can be met, and the excess waste heat can be used to produce cold water.

[0046] In terms of spatial arrangement, from top to bottom, they are the second absorption evaporation group, the first condensation generation group, and the first absorption evaporation group. The pressure in the second absorption evaporation group is greater than the pressure in the first condensation evaporation group, and the pressure in the first condensation evaporation group is greater than the pressure in the first absorption evaporation group. This pressure difference and gravity difference are fully utilized to realize the transfer of internal lithium bromide solution, refrigerant vapor, etc. For example, when the lithium bromide solution flows from the second absorber A2 to the first absorber A1 and the first generator G1, both the pressure difference and the gravity difference are borrowed, saving energy.

[0047] Embodiment 2:

[0048] like Figure 3As shown, the circulation of lithium bromide inside the system is carried out in parallel. Specifically, under the action of the waste heat source, the first generator G1 causes part of the refrigerant in the refluxed dilute solution to form refrigerant vapor after being heated, and the dilute solution loses part of the refrigerant to form a concentrated solution. The concentrated solution is pumped by the solution pump and is divided into two paths. One path enters the high-temperature absorber A2 through the high-temperature solution heat exchanger 103. The concentrated solution absorbs the refrigerant vapor in the high-temperature absorber A2 to form a dilute solution and then enters the first generator G1 through the high-temperature solution heat exchanger 103; the other path enters the low-temperature absorber A1 through the low-temperature solution heat exchanger 102. The concentrated solution absorbs the refrigerant vapor in the low-temperature absorber A1 to form a dilute solution and then enters the first generator G1 through the low-temperature solution heat exchanger 102.

[0049] The refrigerant circulation process in this example is: the refrigerant vapor generated by the first generator G1 is condensed in the first condenser C1 to form refrigerant water, and the refrigerant water returns to the low-temperature evaporator E1 and the high-temperature evaporator E2 through the common refrigerant pump 104.

[0050] Cooling water pipelines, refrigerated water or hot water pipelines and waste heat pipelines are equipped externally. Specifically, the waste heat source is split through the three-way valve 201, one stream enters the high-temperature evaporator E2, and the other enters the first generator G1. The flow distribution is controlled by the three-way valve 201, and the control target can be adjusted according to the customer's main needs.

[0051] The cooling water pipeline first enters the tube side of the first condenser C1 and then enters the tube side of the low-temperature absorber A1, or first enters the tube side of the low-temperature absorber A1 and then enters the tube side of the first condenser C1, and is finally discharged through the cooling water outlet E.

[0052] The cold water to be produced enters the tube side of the low-temperature evaporator E1 from the cooling water inlet H, absorbs heat and cools down in the low-temperature evaporator E1, and is discharged from the cooling water outlet I.

[0053] The hot water to be produced enters the tube side of the high-temperature absorber A2 from the hot water inlet F, absorbs heat in the high-temperature absorber A2 to increase its temperature, and is discharged from the hot water outlet G.

[0054] A first control valve 111 is provided on the solution pipeline from the low-temperature absorber A1 to the first generator G1, and a second control valve 112 is provided on the solution pipeline from the high-temperature absorber A2 to the first generator G1.

[0055] If the customer has a clear demand for cooling capacity, the opening control of the three-way valve 201 can be linked to the cold water outlet temperature to control the flow of the waste heat source entering the first generator G1. The dilute solution in the first generator G1 forms a concentrated solution under the action of the waste heat source. The concentrated solution needs to enter the low-temperature absorber A1 and the high-temperature absorber A2 respectively, but the flow distribution of the two needs to match the amount of waste heat source. Therefore, it is necessary to control the liquid level of the low-temperature absorber A1 through the solution pump frequency conversion control, combined with the adjustment of the opening of the first control valve 111 and the second control valve 112. For example, increasing the working frequency of the solution pump 101, increasing the opening of the first control valve 111, and reducing the opening of the second control valve 112 can increase the solution circulation volume of the low-temperature absorber A1, thereby matching the input waste heat and increasing the cooling capacity. This can not only meet the cooling capacity demand, but also use the excess waste heat to produce hot water or steam.

[0056] If the customer has a clear demand for the flow rate of producing hot water or steam, the opening control of the three-way valve 201 can be linked with the hot water outlet temperature or steam flow rate to control the flow rate of the waste heat source entering the high-temperature evaporator E2. The liquid refrigerant forms refrigerant vapor in the high-temperature evaporator E2, and the refrigerant vapor is absorbed by the high-temperature absorber A2 to release heat to produce high-temperature hot water or steam. The concentrated solution of the generator needs to enter the low-temperature absorber A1 and the high-temperature absorber A2 respectively. The flow distribution of the two needs to take the hot water outlet temperature as the final control target and the liquid level of the high-temperature absorber A2 as the final control target. For the intermediate control target, the liquid level of the high-temperature absorber A2 is controlled by changing the frequency of the solution pump in combination with adjusting the opening of the first control valve 111 and the second control valve 112, thereby adjusting the outlet temperature. For example, by increasing the working frequency of the solution pump 101, closing the opening of the first control valve 111, and increasing the opening of the second control valve 112, the solution circulation volume of the high-temperature absorber A2 can be increased, thereby matching the input waste heat and increasing the heating capacity. In this way, the demand for high-temperature hot water or steam production can be met, and the excess waste heat can be used to produce cold water.

[0057] In terms of spatial arrangement, from top to bottom, there are the second absorption evaporation group, the first absorption evaporation group, and the first condensation generation group. The pressure in the second absorption evaporation group is greater than the pressure in the first condensation evaporation group, and the pressure in the first condensation evaporation group is greater than the pressure in the first absorption evaporation group. This pressure difference and gravity difference are fully utilized to realize the transfer of internal lithium bromide solution, refrigerant vapor, etc.

[0058] Embodiment 3:

[0059] like Figure 5 , Figure 6The unit shown has a completely independent refrigeration system and a heating system, that is, the first generator G1, the first condenser C1, the low-temperature evaporator E1, and the low-temperature absorber A1 form an absorption refrigerator, and the second generator G2, the second condenser C2, the high-temperature evaporator E2, and the high-temperature absorber A2 form an absorption heat pump. The two systems share some external pipelines, such as the pipelines for the waste heat source and the cooling water.

[0060] In this structure, the waste heat source is divided into two paths through the three-way valve 201, one path enters the first generator G1 as a drive for the refrigeration cycle, and the other path enters the high-temperature evaporator E2 and the second generator G2 as a drive for the heating cycle.

[0061] If the customer has a clear demand for cooling capacity, its control method is the same as that of the existing refrigerator. If the customer has a clear demand for hot water or steam flow, its control method is the same as that of the existing Class II heat pump. In fact, the two can be regarded as bypass pipelines.

[0062] The cooling water enters from the cooling water inlet D, and passes through the second condenser C2, the first condenser C1, and the low-temperature absorber A1 in sequence. The order in which the cooling water enters and exits the second condenser C2, the first condenser C1, and the low-temperature absorber A1 is not limited, as long as heat exchange is achieved, and finally flows out through the cooling water outlet E.

[0063] The cold water to be produced enters the tube side of the low-temperature evaporator E1 through the cooling water inlet H, absorbs heat and cools down in the low-temperature evaporator E1, and is discharged from the cooling water outlet I.

[0064] The hot water to be produced enters the tube side of the high-temperature absorber A2 through the hot water inlet F, absorbs the heat released by the lithium bromide solution absorbing the refrigerant steam in the high-temperature absorber A2 to be heated, and then is discharged through the hot water outlet G.

[0065] Lithium bromide solution circulates in the heating system: the concentrated solution from the first generator G1 enters the high-temperature absorber A2 through the first solution pump 101 and the high-temperature solution heat exchanger 103. The concentrated solution absorbs the refrigerant vapor in the high-temperature absorber A2 to form a dilute solution and then enters the first generator G1 again through the high-temperature solution heat exchanger 103.

[0066] Refrigerant circulation in the heating system: the refrigerant vapor generated by the first generator G1 is condensed in the first condenser C1 to form refrigerant water, and the refrigerant water returns to the high-temperature evaporator E2 through the high-pressure refrigerant pump 106.

[0067] Lithium bromide solution circulates in the refrigeration system: the concentrated solution from the second generator G2 enters the low-temperature absorber A1 through the second solution pump 107 and the low-temperature solution heat exchanger 102. The concentrated solution absorbs the refrigerant vapor in the low-temperature absorber A1 to form a dilute solution and then enters the generator again through the low-temperature solution heat exchanger 102.

[0068] Refrigerant circulation in the refrigeration system: the refrigerant vapor generated by the second generator G2 is condensed in the second condenser to form refrigerant water, and the refrigerant water returns to the low-temperature evaporator E1 through the low-pressure refrigerant pump 105.

[0069] In terms of spatial arrangement, from top to bottom, the second absorption evaporation group, the first absorption evaporation group, the first condensation generation group and the second condensation evaporator group are arranged side by side at the bottom. The pressure in the second absorption evaporation group is greater than the pressure in the first condensation evaporation group, and the pressure in the first condensation evaporation group is greater than the pressure in the first absorption evaporation group. This pressure difference and gravity difference are fully utilized to realize the transfer of internal lithium bromide solution, refrigerant vapor, etc.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling and heating cogeneration type lithium bromide unit, characterized in that: It includes a condenser, a generator, a first absorber, a second absorber, a first evaporator, and a second evaporator. The condenser, the generator, the first absorber, and the first evaporator are combined into an absorption refrigerator, and the condenser, the generator, the second absorber, and the second evaporator are combined into an absorption heat pump; The second absorber and the second evaporator form a second absorption and evaporation group, the first absorber and the first evaporator form a first absorption and evaporation group, and the condenser and the generator form a condensation and generation group; It also includes a three-way valve, wherein the inlet of the three-way valve is connected to the waste heat source, the first outlet of the three-way valve is connected to the pipe side of the generator, and the second outlet of the three-way valve is connected to the pipe side of the second evaporator; The cooling water pipeline connects the tube side of the condenser and the tube side of the first absorber; The hot water pipe is connected to the pipe side of the second absorber, and the refrigeration water pipe is connected to the pipe side of the first evaporator.

2. The cooling and heating cogeneration type lithium bromide unit according to claim 1, characterized in that: The outlet of the refrigeration water pipe is provided with a cold water temperature sensor, the outlet of the heating water pipe is provided with a hot water temperature sensor, and also includes a proportional controller, which is used to receive signals from the cold water temperature sensor and the hot water temperature sensor and control the opening of the three-way valve.

3. The cooling and heating cogeneration type lithium bromide unit according to claim 1 or 2, characterized in that: The lithium bromide concentrated solution in the generator is connected to the shell side inlet of the second absorber through a solution pump, the shell side outlet of the second absorber is connected to the shell side inlet of the first absorber, and the shell side outlet of the first absorber returns to the generator through a pipeline.

4. The cooling and heating cogeneration type lithium bromide unit according to claim 1 or 2, characterized in that: The lithium bromide concentrated solution in the generator is connected to the shell side inlet of the first absorber and the shell side inlet of the second absorber through a solution pump, and the shell side outlet of the first absorber and the shell side outlet of the second absorber are connected to the generator through pipelines.

5. The cooling and heating cogeneration type lithium bromide unit according to claim 3, characterized in that: In terms of spatial layout, from top to bottom, they are the second absorption and evaporation group, the condensation generation group, and the first absorption and evaporation group.

6. The cooling and heating cogeneration type lithium bromide unit according to claim 4, characterized in that: In terms of spatial layout, from top to bottom, they are: the second absorption and evaporation group, the first absorption and evaporation group, and the condensation generation group.

7. The cooling and heating cogeneration type lithium bromide unit according to claim 1 or 2, characterized in that: The condenser includes a first condenser and a second condenser which are independent of each other, and the generator includes a first generator and a second generator which are independent of each other. The first condenser and the first generator constitute a first condensation generating group, and the second condenser and the second generator constitute a second condensation generating group; the first condensation generating group and the first absorption evaporation group constitute an absorption refrigeration unit, and the second condensation generating group and the second absorption evaporation group constitute an absorption heat pump.

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