Two-stage type lithium bromide absorption heat pump unit capable of realizing double-effect refrigeration

Abstract

The invention relates to a two-stage lithium bromide absorption heat pump unit capable of realizing double-effect refrigeration, and belongs to the technical field of refrigeration equipment. The unit comprises a steam generator I, a condenser I, an evaporator I, an absorber I, a heat exchanger I, a solution pump I, a refrigerant pump I, a steam generator II, a low-pressure generator, a condenser II, an evaporator II, an absorber II, a heat exchanger II, a solution pump II, a refrigerant pump II, a stop valve A, a stop valve B, a stop valve C and a stop valve D. The two-stage lithium bromideabsorption heat pump unit with double-effect refrigeration can be switched through a valve, when a heating working condition is operated in winter, the unit operates according to the principle of a two-section type heat pump, when a refrigeration working condition is operated in summer, the unit operates according to a steam double-effect type solution parallel refrigeration process, meanwhile, the refrigeration performance coefficient of the double-effect refrigeration is greatly improved, the steam consumption is saved, one machine is used for two purposes, the initial investment of equipment is reduced, and the occupied space of equipment is saved.

Description

technical field [0001] The invention relates to a two-stage lithium bromide absorption heat pump unit capable of double-effect refrigeration, which belongs to the technical field of refrigeration equipment. Background technique [0002] In areas where heat sources are required in production processes and life, and low-temperature waste heat is required, and deep recovery of waste heat is required, the waste water has a large cooling range and low temperature, and the hot water produced has a high temperature rise and a large temperature difference. Multi-stage first-class lithium bromide absorption heat pump units (such as figure 1 It is a two-stage steam type first-class lithium bromide absorption heat pump unit), which can save a large amount (more than 40%) of medium-pressure steam consumption and realize comprehensive utilization of energy. In some occasions, not only heating is required in winter, but cooling is also required in summer. In order to be able to use one m...

AI Technical Summary

Problems solved by technology

In the case of deep recovery of waste heat, such as figure 2 The unit is not easy to realize, which will result in small heat transfer temperature difference, large heat transfer area, and high cost of unit materials. In order to meet the heating requirements, the heat pump unit needs to adopt a two-stage type. However, how can it be realized on this two-stage heat pump unit? Double-effect refrigeration improves the coefficient of refrigeration performance and saves steam. Whether it is heating or cooling, it can reduce the heat exchange area of ​​the unit and reduce the material cost of the unit. It is easy to operate, safe and reliable, and has become one of the important topics of current research.

Images