Falling film evaporator with gas-liquid separating and membrane-distributing functions

Abstract

The invention discloses a falling film evaporator with gas-liquid separating and membrane-distributing functions, which comprises at least two layers of film distributors with a gas-liquid separation function, wherein the first layer of film distributor is connected with a refrigerant inlet pipe, the second layer of film distributor is positioned below the first layer of film distributor, and at least one group of exhaust pipes are arranged between the second layer of film distributor and the first layer of film distributor. The invention has the advantages that: at least two layers of film distributors are arranged in the horizontal pipe falling film evaporator, a refrigerant is firstly subjected to effective gas-liquid separation and uniformly distributed on the outer walls of the exhaust pipes in the evaporator, thus the influence on heat exchange due to the gas phase in the refrigerant can be avoided, phenomena of local aggregation and local dryness due to nonuniform distribution of the refrigerant in the exhaust pipes can be effectively avoided, the heat exchange efficiency is effectively increased, and the purpose of saving energy is achieved.

Description

Technical field [0001] The invention relates to the technical field of evaporators, in particular to a falling film evaporator with a gas-liquid separation cloth film function. Background technique [0002] The rapid development of China's current social economy will inevitably lead to the continuous growth of total energy demand, thereby increasing my country's external dependence on energy supply; my country's energy supply will show an overall tightness in the next few years. Today, when the energy problem has changed from the original livelihood problem to a strategic problem, energy conservation and environmental protection have attracted much attention. In China’s energy consumption, ensuring clean, economic, adequate and safe energy supply is a major long-term bottleneck for my country’s development. Among them, my country’s building energy consumption has accounted for 27.8% of total energy consumption, which is about three times that of countries at the same latitude, an...

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Problems solved by technology

[0015] Although theoretically the spray evaporator has incomparable advantages over other shell-and-tube evaporators in terms of efficiency, economy and environmental protection, but because the spray evaporator is greatly affected by the characteristics of the refrigerant and the flow rate of the refrigerant, It is not that the performance of the spray evaporator is superior to other evaporators under any operating conditions for any refrigerant, and there are still a series of problems in the research and application of the spray evaporator, which restrict the development of the horizontal tube falling film evaporator. Application promotion, mainly: the refrigerant liquid on the outer surface of the evaporator tube is unevenly distributed along the tube length and tube circumference direction, resulting in local drying up

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