Ultra-low temperature circulation refrigeration method employing injectors

Abstract

The invention relates to an ultra-low temperature circulation refrigeration method employing injectors. In the method, high-pressure mixed refrigerants compressed by a compressor (1) enter a condenser (2) and then enter a first gas-liquid separator (3) to realize gas and liquid phase separation, liquid refrigerants flowing out of the first gas-liquid separator (3) enter a first injector (4), gas and liquid two-phase mixed work media from an outlet of the first injector (4) are cooled by a first heat regenerator (5) and then enter a second gas-liquid separator (6) to be separated, work fluid of a second injector (8) is processed into low-pressure steam through a first throttling member (7) and a condensing evaporator (9), and the low-pressure steam is pressurized by the second injector (8), flows into the first heat regenerator (5) to be subjected to overheating and then flows back to the compressor (1); and gaseous refrigerants flowing out of the top of the first gas-liquid separator (3) flow into the condensing evaporator (9), are recooled through a second heat regenerator (10) and enter an evaporator (12) through a second throttling member (11) for refrigeration at low temperature, the ultra-low temperature can reach minus 40 DEG C to minus 170 DEG C, and the energy saving effect is good.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to an ultra-low temperature cycle refrigeration method with an ejector. Background technique [0002] Automatic cascade refrigeration cycle technology is one of the more common technologies in small and medium-sized low-temperature refrigeration equipment. The automatic cascade refrigeration cycle technology was first invented in 1936, and this technology was successfully applied in natural gas liquefaction. At present, the self-cascading refrigeration cycle technology can obtain the low temperature environment from the liquid nitrogen temperature range below 80K to the traditional vapor compression refrigeration temperature range of 230K, and has been continuously promoted in the field of low temperature refrigeration. [0003] The automatic cascade refrigeration cycle technology uses a multi-element zeotropic mixture as the refrigerant. According to the characte...

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Problems solved by technology

However, in order to ensure the higher working pressure required by the working fluid in the ejector, this technology needs to increase the evaporation pressure of the high boiling point working fluid in the evaporative condenser, which will inevitably lead to an increase in its evaporation temperature, and the increase in the evaporation temperature of the high boiling point working fluid will As a result, the boiling point of the low-boiling point component is greatly limited; if the selected low-boiling point component has a low boiling point, the high-boiling point working fluid with a higher evaporation temperature in the condensing evaporator will not be able to condense the low-boiling point component into a liquid , Therefore, the automatic cascade refrigeration cycle with ejector is more suitable for occasions with high refrigeration temperature, and its use is greatly restricted in occasions with low refrigeration temperature

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