Efficient coupling heat exchange heat pump device

Abstract

The utility model relates to an efficient coupling heat exchange heat pump device which comprises a generator connected with a first compressor. The first compressor is connected with the condenser; the condenser is connected with a first throttle valve; the first throttle valve is connected with the first evaporator; the first evaporator is respectively connected with the second compressor and the second throttle valve; the second compressor is connected with the first absorber; the first absorber is connected with the second absorber; the second throttle valve is connected with the second evaporator; the second evaporator is connected with the third compressor; the third compressor is connected with the second absorber; the second absorber is connected with a circulating pump; and the circulating pump is connected with the generator. Compared with a conventional heat pump, the mode that the two evaporators are connected in series is adopted, a waste heat source can be more fully utilized, the two absorbers are connected in series so that a cold source can further absorb more heat energy, and therefore the temperature can be increased step by step.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery heating and cooling technology, and specifically relates to a high-efficiency coupled heat exchange heat pump device. Background Technology

[0002] To improve energy efficiency and reduce environmental pollution, industrial waste heat recovery technology has emerged. Conventional methods involve installing heat exchangers or waste heat boilers at the end of the equipment. However, these methods have limited energy recovery capabilities and require relatively high waste heat temperatures, especially low-grade waste heat below 100°C, which is difficult to effectively recover and utilize, resulting in low energy system efficiency.

[0003] To improve the recovery and utilization rate of industrial waste heat and the effective use of low-grade waste heat, and to reduce carbon emissions in the industrial sector, heat pumps are generally used to recover industrial waste heat. Absorption heat pumps mainly consist of components such as generators, condensers, evaporators, and absorbers. They utilize the interaction between absorbents (such as lithium bromide or ammonia) and refrigerants (such as water) to absorb and release heat, thereby achieving heat transfer.

[0004] However, existing heat pump technology is limited by thermodynamic cycles, working fluid properties, and compressor temperature and pressure range. Conventional heat pumps cannot recover industrial waste heat more efficiently and cannot meet the needs of process production and other scenarios. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency coupled heat exchange heat pump device that can efficiently recover industrial waste heat and achieve a step-by-step increase in temperature.

[0006] To achieve the above objectives, the present invention employs a high-efficiency coupled heat exchange heat pump device, comprising a generator, a first absorber, a second absorber, a first evaporator, a second evaporator, a condenser, a first compressor, a second compressor, and a third compressor.

[0007] The generator's outlet is connected to a first compressor via a pipeline; the first compressor's outlet is connected to a first condenser's inlet via a pipeline; the condenser's first outlet is connected to a first throttle valve via a pipeline; the end of the first throttle valve furthest from the condenser is connected to a first evaporator's inlet via a pipeline; the first evaporator's first outlet is connected to a second compressor and a second throttle valve; the second compressor's outlet is connected to a first absorber's inlet via a pipeline; the first absorber's first outlet is connected to a second absorber's first inlet via a pipeline; the second throttle valve is connected to a second evaporator's first inlet via a pipeline; the second evaporator's first outlet is connected to a third compressor via a pipeline; the third compressor's outlet is connected to a second absorber's first inlet via a pipeline; the second absorber's first outlet is connected to a circulation pump via a pipeline; the circulation pump's outlet is connected to the generator's first inlet via a pipeline; and the generator's water outlet is connected to the first absorber's first inlet via a pipeline.

[0008] The second inlet of the second evaporator is connected to a heat source inlet pipe, and the second outlet is connected to the second inlet of the first evaporator via a pipe; the second outlet of the first evaporator is connected to a heat source outlet pipe; the second inlet of the second absorber is connected to a cold source inlet pipe, and the second outlet is connected to the second inlet of the first absorber via a pipe; the second outlet of the first absorber is connected to the second phase of the condenser; the second outlet of the condenser is connected to a cold source outlet pipe.

[0009] Preferably, the device further includes a heat exchanger, wherein the first inlet of the heat exchanger is connected to the outlet of the circulating pump via a pipeline, and the second outlet is connected to the first inlet of the generator via a pipeline; the second inlet of the heat exchanger is connected to the outlet of the generator via a pipeline, and the second outlet is connected to the first inlet of the first absorber via a pipeline.

[0010] Preferably, the first outlet of the first evaporator is connected to a refrigerant pipeline; the refrigerant pipeline is connected to a first refrigerant branch pipe and a second refrigerant branch pipe via a tee; the ends of the first and second refrigerant branch pipes away from the refrigerant pipeline are respectively connected to a second compressor and a second throttle valve; a valve is installed on the first refrigerant branch pipe.

[0011] This utility model discloses a high-efficiency coupled heat exchange heat pump device, which has the following advantages compared with the prior art: the use of two evaporators in series can make fuller use of waste heat source compared with conventional heat pumps, and the use of two absorbers in series allows the cold source to further absorb more heat energy, thereby achieving a step-by-step increase in temperature. At the same time, the two-stage throttling and parallel compression method meets the heat exchange requirements of working fluids with different pressures, achieving a higher heat source outlet temperature while ensuring a higher cycle efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] Example 1

[0015] like Figure 1 As shown, a high-efficiency coupled heat exchange heat pump device includes a generator 1, a first absorber 3, a second absorber 4, a first evaporator 6, a second evaporator 5, a condenser 7, a first compressor 8, a second compressor 9, and a third compressor 10.

[0016] The outlet of the generator 1 is connected to the first compressor 8 via a pipeline; the exhaust port of the first compressor 8 is connected to the first inlet of the condenser 7 via a pipeline; the first outlet of the condenser 7 is connected to a first throttle valve 11 via a pipeline; the end of the first throttle valve 11 away from the condenser 7 is connected to the first inlet of the first evaporator 6 via a pipeline; the first outlet of the first evaporator 6 is connected to the second compressor 9 and the second throttle valve 12 respectively; the exhaust port of the second compressor 9 is connected to the first inlet of the first absorber 3 via a pipeline; the first outlet of the first absorber 3... The outlet is connected to the first inlet of the second absorber 4 via a pipeline; the second throttle valve 12 is connected to the first inlet of the second evaporator 5 via a pipeline; the first outlet of the second evaporator 5 is connected to the third compressor 10 via a pipeline; the exhaust port of the third compressor 10 is connected to the first inlet of the second absorber 4 via a pipeline; the first outlet of the second absorber 4 is connected to a circulation pump 13 via a pipeline; the outlet of the circulation pump 13 is connected to the first inlet of the generator 1 via a pipeline; the outlet of the generator 1 is connected to the first inlet of the first absorber 3 via a pipeline.

[0017] The second inlet of the second evaporator 5 is connected to a heat source inlet pipe 16, and the second outlet is connected to the second inlet of the first evaporator 6 via a pipe; the second outlet of the first evaporator 6 is connected to a heat source outlet pipe 17; the second inlet of the second absorber 4 is connected to a cold source inlet pipe 18, and the second outlet is connected to the second inlet of the first absorber 3 via a pipe; the second outlet of the first absorber 3 is connected to the second outlet of the condenser 7; the second outlet of the condenser 7 is connected to a cold source outlet pipe 19.

[0018] In this embodiment, a heat exchanger 2 is also included. The first inlet of the heat exchanger 2 is connected to the outlet of the circulating pump 13 through a pipeline, and the second outlet is connected to the first inlet of the generator 1 through a pipeline. The second inlet of the heat exchanger 2 is connected to the outlet of the generator 1 through a pipeline, and the second outlet is connected to the first inlet of the first absorber 3 through a pipeline.

[0019] In this embodiment, lithium bromide solution is used as the absorbent, and water is used as the refrigerant. Water vapor in generator 1 enters the first compressor 8 through the outlet of generator 1. After compression by the first compressor 8, it enters the condenser 7, releases heat, and then passes through the first throttle valve 11 to become a gas-liquid mixture. This gas-liquid mixture is heated into a gaseous state by the second heat source in the first evaporator 6 and flows out of the refrigerant pipeline from the first outlet of the first evaporator 6. A portion of the water vapor is compressed by the second compressor 9 and enters the first absorber 3. The lithium bromide solution absorbs this water vapor, forming a dilute solution that releases a large amount of heat to heat the cold source, and then enters the second absorber 4. Additionally... A portion of the water vapor is depressurized by the second throttle valve 12 and enters the second evaporator 5. After being heated into a gaseous state by the second heat source, it is compressed by the third compressor 10 and enters the second absorber 4. After mixing with the dilute lithium bromide solution from the first absorber 3, the concentration of the lithium bromide solution further decreases, releasing a large amount of heat to heat the cold source. The dilute lithium bromide solution passes through the circulation pump 13 and the heat exchanger 2 in sequence and enters the generator 1 to exchange heat with the first heat source. The water in the dilute lithium bromide solution evaporates, the concentration of the lithium bromide solution increases, and the water vapor enters the first compressor 8 for repeated circulation. The lithium bromide solution is discharged into the first absorber 3 through the outlet of the generator 1.

[0020] In addition, the first heat source enters the generator 1 through the heat source inlet 14, exchanges heat with the dilute lithium bromide solution, and then its temperature decreases before being discharged through the heat source outlet 15 of the generator 1. The second heat source enters the second evaporator 5 through the heat source inlet pipe 16, exchanges heat with the water in the second evaporator 5, and then enters the first evaporator 6 to exchange heat with the water in the first evaporator 6. The cold source enters the second absorber 4 through the cold source inlet pipe 18, is heated by the heat released when the lithium bromide solution absorbs water vapor, then enters the first absorber 3 for reheating, and finally enters the condenser 7 to exchange heat with water vapor, thus increasing the temperature of the cold source and achieving a step-by-step increase in temperature.

[0021] In addition, by exchanging heat between the dilute lithium bromide solution and the concentrated lithium bromide solution through heat exchanger 2, the heat from the first heat source can be further recovered, which helps to generate more water vapor in generator 1.

[0022] Example 2

[0023] The first outlet of the first evaporator 6 is connected to a refrigerant pipeline; the refrigerant pipeline is connected to a first refrigerant branch pipe and a second refrigerant branch pipe via a tee; the ends of the first and second refrigerant branch pipes away from the refrigerant pipeline are respectively connected to the second compressor 9 and the second throttle valve 12; a valve is installed on the first refrigerant branch pipe, which can control the water vapor in the first evaporator 6 from entering the second compressor 9. Closing the valve, the first throttle valve 11, the first evaporator 6, and the second compressor 9 allows for independent adjustment according to specific heat source conditions and needs.

Claims

1. A high-efficiency coupled heat exchange heat pump device, characterized in that, It includes a generator (1), a first absorber (3), a second absorber (4), a first evaporator (6), a second evaporator (5), a condenser (7), a first compressor (8), a second compressor (9), and a third compressor (10). The outlet of the generator (1) is connected to the first compressor (8) via a pipeline; the outlet of the first compressor (8) is connected to the first inlet of the condenser (7) via a pipeline; the first outlet of the condenser (7) is connected to a first throttle valve (11) via a pipeline; the end of the first throttle valve (11) away from the condenser (7) is connected to the first inlet of the first evaporator (6) via a pipeline; the first outlet of the first evaporator (6) is connected to the second compressor (9) and the second throttle valve (12) respectively; the outlet of the second compressor (9) is connected to the first inlet of the first absorber (3) via a pipeline; the first absorber (3) The first outlet is connected to the first inlet of the second absorber (4) via a pipeline; the second throttle valve (12) is connected to the first inlet of the second evaporator (5) via a pipeline; the first outlet of the second evaporator (5) is connected to the third compressor (10) via a pipeline; the exhaust port of the third compressor (10) is connected to the first inlet of the second absorber (4) via a pipeline; the first outlet of the second absorber (4) is connected to a circulating pump (13) via a pipeline; the outlet of the circulating pump (13) is connected to the first inlet of the generator (1) via a pipeline; the outlet of the generator (1) is connected to the first inlet of the first absorber (3) via a pipeline. The second inlet of the second evaporator (5) is connected to a heat source inlet pipe (16), and the second outlet is connected to the second inlet of the first evaporator (6) through a pipe; the second outlet of the first evaporator (6) is connected to a heat source outlet pipe (17); the second inlet of the second absorber (4) is connected to a cold source inlet pipe (18), and the second outlet is connected to the second inlet of the first absorber (3) through a pipe; the second outlet of the first absorber (3) is connected to the second outlet of the condenser (7); the second outlet of the condenser (7) is connected to a cold source outlet pipe (19).

2. The high-efficiency coupled heat exchange heat pump device according to claim 1, characterized in that, It also includes a heat exchanger (2), the first inlet of which is connected to the outlet of the circulating pump (13) through a pipeline, and the second outlet is connected to the first inlet of the generator (1) through a pipeline; the second inlet of the heat exchanger (2) is connected to the outlet of the generator (1) through a pipeline, and the second outlet is connected to the first inlet of the first absorber (3) through a pipeline.

3. The high-efficiency coupled heat exchange heat pump device according to claim 1, characterized in that, The first outlet of the first evaporator (6) is connected to a refrigerant pipeline; the refrigerant pipeline is connected to a first refrigerant branch pipe and a second refrigerant branch pipe via a tee; the ends of the first refrigerant branch pipe and the second refrigerant branch pipe away from the refrigerant pipeline are respectively connected to the second compressor (9) and the second throttle valve; a valve is installed on the first refrigerant branch pipe.

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