Two-stage absorption second-kind lithium bromide absorption heat pump unit with flash evaporator

Abstract

The invention relates to a two-stage absorption second-kind lithium bromide absorption heat pump unit with a flash evaporator. The two-stage absorption second-kind lithium bromide absorption heat pump unit comprises a generator (1), a condenser (2), an evaporator (6), an absorber and a solution heat exchanger. The flash evaporator (14) is additionally arranged in the unit, meanwhile, the absorber is divided into a first-stage absorber body (11) and a second-stage absorber body (13), the solution heat exchanger is divided into a high-temperature solution heat exchanger body (12) and a low-temperature solution heat exchanger body (10), the second-stage absorber body (13) and the flash evaporator (14) are located in a same cavity, the first-stage absorber body (11) and the evaporator (6) are located in a same cavity, the generator (1) and the condenser (2) are located in a same cavity, waste heat sources enter the evaporator (6) and the generator (1), solutions circulate in a series connection mode, the concentrated solutions firstly enter the second-stage absorber body (13) to become the middle solutions and then enter the first-stage absorber body (11) to become the dilute solutions, and the dilute solutions enter the generator (1) to be concentrated into the concentrated solutions. According to the two-stage absorption second-kind lithium bromide absorption heat pump unit, middle (low)-temperature waste heat sources are used for driving, and the heat source temperature rise amplitude can be improved under the condition that cooling water is used.

Description

technical field [0001] The invention relates to a second-type lithium bromide absorption heat pump unit. It belongs to the technical field of air conditioning equipment. Background technique [0002] There are a large amount of medium-temperature waste heat resources in the production process, and direct discharge not only wastes a large amount of heat sources, but also produces thermal pollution. Cooling with cooling water requires a large amount of cooling water. It requires a large amount of high-temperature heat source and consumes a large amount of high-quality energy to supply it. In such an occasion, the second type of lithium bromide absorption heat pump unit is used, and the waste heat and waste heat can be effectively recovered under the condition of using cooling water to produce a higher temperature heat source. However, the second type of lithium bromide absorption heat pump units in the past are all single-effect processes, such as figure 1 As shown, it main...

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Problems solved by technology

Compared with the waste heat heat source temperature, the temperature of the heat source produced by the second type of absorption heat pump unit in the single-effect process has a temperature rise range of only about 30°C, and is also limited by the temperature of the cooling water. The temperature rise of the heat source cannot be further increased, so that the produced The grade of heat source is limited, so it cannot meet the production process with high grade of heat demand

Especially for the low temperature of the waste heat source, the second type of absorption heat pump unit adopting the traditional single-effect process cannot produce high-quality heat source for production process or domestic use due to the limited temperature rise range, so that the medium temperature waste heat cannot be recycled. and wasted in vain, resulting in increased energy consumption

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