Double-effect heat pump capable of realizing double-stage ejection effect for refrigerant steam at outlet of evaporator

Abstract

The invention discloses a double-effect heat pump capable of realizing a double-stage ejection effect for refrigerant steam at an outlet of an evaporator. The double-effect heat pump comprises a high pressure generator, a low pressure generator, a first throttle valve, a condenser, a second throttle valve, the evaporator, an absorber, a solution pump, a first solution heat exchanger, a second solution heat exchanger, a primary ejector, a secondary ejector and a third throttle valve. The double-effect heat pump has the advantages that the low-pressure refrigerant steam at the outlet of the evaporator is ejected by the aid of high-grade driving steam and flows into the high pressure generator to be used as a driving heat medium, the work efficiency of each ejector is optimized owing to a double-stage ejection method, requirements on the driving steam are lowered, or low-temperature waste heat media can be utilized, the value of the high-grade driving steam is sufficiently realized, the double-effect heat pump is high in energy conservation benefit, shortcomings of an absorption heat pump and a steam ejector heat pump are sufficiently overcome, and the application range of a heat pump technology in the energy conservation field is expanded.

Description

technical field [0001] The invention belongs to the technical field of low-temperature waste heat utilization. Background technique [0002] Absorption heat pumps use thermal energy as power, and use the reverse Carnot cycle to transfer heat from low temperature to high temperature. It is especially suitable for occasions with a large amount of waste heat. The condensed state of waste heat can be gaseous or liquid. For the absorption heat pump with lithium bromide aqueous solution as the working medium, due to the physical properties of the working medium itself, the temperature and concentration of the solution itself are limited. In order to make the absorption heat pump operate in a reasonable temperature and concentration range and achieve the best Work efficiency, people have developed a double-effect absorption heat pump. At the same waste heat temperature, when the efficiency of the absorption heat pump increases, no matter which solution circulation is used, the requ...

AI Technical Summary

Problems solved by technology

The low-pressure steam inhaled by the steam injection heat pump can be exhausted exhaust steam or flash steam generated by high-temperature condensed water. Since this type of heat pump can only recover steam, for low-temperature liquid waste heat, such as low-temperature hot water containing The heat cannot be recovered directly, which greatly limits its application fields.

Images