Dry evaporator and condensing oil gas recovery device

Abstract

The invention discloses a dry evaporator and a condensing oil gas recovery device comprising the dry evaporator. The dry evaporator comprises an evaporator body (1), a refrigerant inlet (2) and a liquid collection bag (3) which are positioned on the lower part of the evaporator body, and a gas collection bag (4) and a refrigerant outlet (5) which are positioned on the upper part of the evaporator body, wherein the refrigerant inlet (2) is connected to the liquid collection bag (3); the refrigerant outlet (5) is connected to the gas collection bag (4); the liquid collection bag (3) is communicated with the gas collection bag (4) in the evaporator body (1) through a refrigerant pipeline; the refrigerant outlet (5) is connected with an air suction pipe of a compressor; and the dry evaporator is characterized by also comprising at least one oil return pipe (6), wherein a lower port of the oil return pipe (6) is communicated with the liquid collection bag (3), and an upper port of the oil return pipe (6) is communicated with the air suction pipe of the compressor. The dry evaporator has a simple oil return structure, so that refrigeration oil can timely return to the compressor at low evaporating temperature, the compressor is stably operated, and the oil gas recovery efficiency is high.

Description

technical field [0001] The invention belongs to the field of oil gas recovery, in particular to a dry evaporator and a condensation type oil gas recovery device comprising the evaporator. Background technique [0002] In a refrigeration system using a dry evaporator, the refrigerant passes through the evaporator in a bottom-in and top-out manner, and the high-speed refrigerant air flow brings the refrigerated oil from the evaporator back to the compressor through the return pipe. Condensing oil and gas recovery uses the principle of vapor compression refrigeration to cool the oil and gas to below -70°C, and the hydrocarbons in the oil and gas are condensed and liquefied to be separated. Operating in such a low temperature environment, the viscosity of the refrigerated oil in the system becomes larger, A large amount of adhesion and deposition in the evaporator makes it difficult to return to the compressor with the refrigerant, which will cause the compressor to malfunction ...

AI Technical Summary

Problems solved by technology

This method makes the refrigerated oil at the outlet of the evaporator return to the compressor in time, but cannot return the refrigerated oil at the evaporator inlet and inside the evaporator to the compressor, especially at the extremely low evaporation temperature of oil and gas recovery, the refrigerated oil is difficult to reach The outlet of the evaporator cannot return to the compressor, let alone solve the oil return problem of the dry evaporator that is completely bottom-in and top-out

[0005] Ineffective oil return from the evaporator will lead to lack of oil in the compressor of the entire oil and gas recovery device, poor lubrication, increased failures, reduced refrigeration efficiency, and poor oil and gas recovery effect

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