Heat exchange tube and heat exchange structure for horizontal-tube falling-film evaporator

Abstract

The invention relates to a heat exchange structure for a horizontal-tube falling-film evaporator. A plurality of parallel heat exchange tube bodies are arranged and fixed on a tube plate in a rectangular array mode. The upturned lateral side of each heat exchange tube body is kept horizontal and is in the shape of an inverted triangle. The invention further relates to a heat exchange tube for the horizontal-tube falling-film evaporator. Feed liquid falls onto the upper end of each heat exchange tube body of a hollow triangular-prism structure, a layer of liquid film is accumulated, and the feed liquid evenly diffuses towards two sides to flow downwards, so that current bias is solved well, and the problems such as coking, wall drying and evaporation quantity reduction are avoided; when falling off again, the feed liquid falls onto the liquid film of the heat exchange tube body below rather than the wall of the tube, so that liquid splashing is reduced, good flaky currents are formed, and heat transmission performance is enhanced. The heat exchange tube and the heat exchange structure are applied to the horizontal-tube falling-film evaporator.

Description

technical field [0001] The invention relates to a horizontal tube falling film evaporator, in particular to a heat exchange tube and a heat exchange structure for a horizontal tube falling film evaporator. Background technique [0002] Evaporation is a unit operation widely used in the chemical industry, and is usually used to remove water from aqueous solutions to achieve product concentration. The heat exchange tubes used in the traditional horizontal tube falling film evaporator are circular tubes 2, and each circular tube 2 is arranged in a rectangular array or a triangular array, such as figure 1 shown. This heat exchange tube and the structure of the heat exchange tube will cause the following three problems: 1. The circular tube can easily cause liquid film deflection; 2. When the liquid film 3 drops outside the circular tube wall, splashing will occur. The arrow in the figure points to; 3. The accumulation of condensed water 4' generated during the heat exchange pr...

AI Technical Summary

Problems solved by technology

This heat exchange tube and the structure of the heat exchange tube will cause the following three problems: 1. The circular tube can easily cause liquid film deflection; 2. When the liquid film 3 drops outside the circular tube wall, splashing will occur. The arrow in the figure points to; 3. The accumulation of condensed water 4' generated during the heat exchange process in the heat exchange tube will occupy a large part of the heat exchange area

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