Segmented compression-segmented heat supply-segmented expansion gas compression type units

Abstract

A subsection compression-subsection heat supply-subsection gas expanding compression type machine set belongs to the technical field of heat pumps / refrigeration, and consists of a compressor, an expander, a heat exchanger, a second heat exchanger and a low-temperature heat exchanger. Gas working substances absorbing heat from the low-temperature heat exchanger and raising temperature enter the compressor; after the gas working substances are compressed in a low pressure compression section, a part of the gas working substances are provided for the heat exchanger to complete the heating of a heated medium at an initial stage; the part of the gas working substances enter the expander and is expanded at a low pressure expansion section; the other part of the gas working substances are provided for the second heat exchanger to complete the heating of a second stage of the heated medium after continuously passing through the whole compression process and raising temperature, and enter the expander from an inlet of the high pressure expansion section of the expander for expanding; the gas working substances completing the expanding work flow through the low-temperature heat exchanger to absorb the heat and raise the temperature and enter the compressor; and a heat regenerator is added to form a regenerative machine set. The gas expanding compression type machine set reduces temperature difference of heat transmission and improves the performance index; when taken as a heat pump, the gas expanding compression type machine set is particularly suitable for occasions with high heating temperature and wide range; and when used for refrigeration, the gas expanding compression type machine set can reduce power consumption.

Description

Technical field: [0001] The invention belongs to the technical field of heat pump / refrigeration. Background technique: [0002] Gas compressor unit is one of the main equipment in waste heat application, which can bring many benefits such as energy saving, environmental protection and economy. The gas compression unit is mainly composed of basic components such as a compressor, a heat exchanger, an expander, and a low-temperature heat exchanger; of heating. When the temperature of the refrigerant medium or waste heat medium is determined, the higher the heat demand temperature of the user, the higher the compression ratio of the compressor, and the performance index of the unit drops significantly and is low; in order to improve the performance index of the unit, classification is generally adopted The technical measures of compression and interstage cooling are used to solve or alleviate the problems of increased unit power consumption, low volumetric efficiency and high ...

AI Technical Summary

Problems solved by technology

When the temperature of the refrigerant medium or waste heat medium is determined, the higher the heat demand temperature of the user, the higher the compression ratio of the compressor, and the performance index of the unit drops significantly and is low; in order to improve the performance index of the unit, classification is generally adopted The technical measures of compression and interstage cooling are used to solve or alleviate the problems of increased unit power consumption, low volumetric efficiency and high compression end temperature caused by excessively high compression ratio, but this contradicts the high temperature demand of the heated medium

[0003] For heat pump units, when the user's heat demand - the heated medium needs to be heated from a lower temperature to a higher temperature, whether it is a unit that uses single-stage compression or a unit that uses staged compression and inter-stage cooling, There is such a defect: the temperature of the gas medium at the end of the compression must exceed the maximum temperature of the heated medium, so that the heating of the low-temperature section of the heated medium must be completed by the highest heat supply of the unit, which will inevitably lead to the failure of the unit. The heat transfer temperature difference is large, which brings about the reduction of the performance index of the unit

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