Multi-stage heat pump system capable of achieving waste heat recovery in stepped mode

Abstract

The invention discloses a multi-stage heat pump system capable of achieving waste heat recovery in stepped mode. The multi-stage heat pump system comprises a first-stage unpowered heat exchanger, a second-stage medium-temperature section heat pump system and a third-stage high-temperature section heat pump system which are sequentially arranged, the water outlet end of tap water is sequentially connected with the first-stage unpowered heat exchanger, the second-stage medium-temperature section heat pump system and the third-stage high-temperature section heat pump system, and a waste heat drainage assembly is sequentially connected with the first-stage unpowered heat exchanger, the third-stage high-temperature section heat pump system and the second-stage medium-temperature section heat pump system and finally enters a sewage collecting pool from the water outlet end of the second-stage medium-temperature section heat pump system. According to the multi-stage heat pump system capable of achieving waste heat recovery in stepped mode, through structural improvement of the system, the use loss of the system is reduced while the waste heat recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery, in particular to a multi-stage heat pump system for cascade recovery of waste heat. Background technique [0002] A large amount of waste heat and waste heat exists in people's life and production activities, such as the current boilers, steel mills, chemical industry and other industries, there are many process waste heat. Among these waste heat, for high-grade waste heat, at present, people only carry out simple direct heat exchange recovery; for low-grade waste heat, with the development of heat pump technology, it is simply recovered by heat pump without considering The optimal working condition of the heat pump has caused the disadvantages of incomplete low-grade heat recovery, large recovery energy consumption, and short service life of the heat pump system. In addition, high and low temperature heat sources are recovered separately, resulting in a large footprint, complex syst...

AI Technical Summary

Problems solved by technology

Among these waste heat, for high-grade waste heat, at present, people only carry out simple direct heat exchange recovery; for low-grade waste heat, with the development of heat pump technology, it is simply recovered by heat pump without considering The optimal working condition of the heat pump has resulted in incomplete recovery of low-grade heat, high energy consumption for recovery, and short service life of the heat pump system.

In addition, high and low temperature heat sources are recovered separately, resulting in large area occupation, complex system operation and maintenance, and low efficiency.

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