Horizontal pipe falling film evaporator

Abstract

The invention relates to a horizontal pipe falling film evaporator. The horizontal pipe falling film evaporator comprises a heat exchange pipe bundle in which steam flows; the heat exchange pipe bundle is obliquely arranged downward in the direction of the flow speed of the steam; and the heat exchange pipe bundle is inclined 2 to 6 degrees downward in the direction of the flow speed of the steam. By the horizontal pipe falling film evaporator, only the whole pipe bundle or the whole evaporator is inclined a certain angle and the whole structure of the evaporator is not changed to ensure that the liquid in the pipe flows out along the direction of the flow speed of the steam and the gathered liquid in the pipe is immediately discharged, so that an effect of enhancing condensation and heat exchange can be achieved; therefore, the heat exchange efficiency can be improved under the condition of not increasing the manufacturing cost of the equipment and the structure.

Description

technical field [0001] The invention relates to an evaporator, in particular to a horizontal tube falling film evaporator with tube bundles arranged obliquely. Background technique [0002] The main heat transfer principle of the horizontal tube falling film evaporator is: falling film evaporation heat transfer outside the tube, steam condensation heat transfer inside the tube. This heat transfer mode of two-phase phase transition inside and outside the tube is the reason for its high heat transfer efficiency. However, as far as the existing horizontal tube falling film evaporator is concerned, the condensation heat transfer in the tube will decrease with the increase of the condensate as the condensation heat transfer progresses, resulting in a decrease in the condensation heat transfer area and a high efficiency condensation heat transfer effect. , and the condensate accumulated in the tube will also reduce the overall condensation heat transfer efficiency because the hea...

AI Technical Summary

Problems solved by technology

However, as far as the existing horizontal tube falling film evaporator is concerned, the condensation heat transfer in the tube will decrease with the increase of the condensate as the condensation heat transfer progresses, resulting in a decrease in the condensation heat transfer area and a high efficiency condensation heat transfer effect. and the condensate accumulated in the tube will also reduce the overall condensation heat transfer efficiency because the heat transfer coefficient is smaller than the condensation heat transfer

[0003] The existing technologies are mainly to increase the steam flow rate and adopt a shorter tube length to solve the effect of the decrease of condensation heat transfer effect, but these technical solutions still have the following defects:

The increase of steam flow rate will inevitably increase the internal resistance of the pipe;

[0005] 2. If a shorter tube length is used, the heat transfer design structure will become complicated

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