Horizontal tube falling film evaporator

Abstract

The invention discloses a horizontal tube falling film evaporator. The horizontal tube falling film evaporator comprises a shell; the shell is connected with a high-pressure liquid storage unit; a first-level liquid distributor and a first-level heat exchange tube bank are arranged in the shell; a plurality of second-level liquid distributors are arranged below the first-level heat exchange tube bank, and a second-level heat exchange tube bank is correspondingly arranged below each second-level liquid distributor; and an ejector is connected to the bottom of the shell and comprises a high-pressure inlet, an ejection inlet and a mixing outlet, the high-pressure inlet is connected with the high-pressure liquid storage unit, the ejection inlet is connected with the bottom of the shell, and the mixing outlet is connected with the second-level liquid distributors. According to the horizontal tube falling film evaporator, an ejector circulating device is adopted to suck unevaporated liquid refrigerant at the bottom of the evaporator into the second-level liquid distributors, cycle spraying of the liquid refrigerant is achieved, thus the distribution uniformity of the refrigerant on the outer surfaces of the tube banks on the lower portion of the evaporator is improved, and the purposes of eliminating dry spots outside a tube and enhancing the overall heat exchange performance of the evaporator are achieved.

Description

technical field [0001] The invention relates to the field of air conditioning and refrigeration, in particular to a horizontal falling film evaporator. Background technique [0002] In the 1990s, with the phase-out of CFC, horizontal tube falling film evaporators began to be used in refrigeration systems. Compared with dry and flooded evaporators, horizontal tube falling film evaporators have obvious advantages: 1) Good heat transfer performance and high evaporation temperature, which can reduce the effect of liquid static pressure on heat transfer temperature difference Influence; 2) The refrigerant charge is small, and the refrigerant charge of the falling film heat exchanger is about 50% of the flooded type; 3) The oil return performance is good, there is only a small amount of refrigerant at the bottom of the evaporator, and the lubricating oil Good concentration is good for oil return. In the design process of the falling film evaporator, it is the key to ensure the u...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a horizontal falling film evaporator, which can realize the recycling of refrigerant liquid and improve the problem of uneven distribution of refrigerant liquid or local dry spots on the outer surface of heat exchange tubes

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