Vertical longitudinal flow evaporator

Abstract

The invention discloses a vertical longitudinal flow evaporator which comprises a heat exchange tube, an inner tube, a heat medium cavity, a water inlet cavity and a water outlet cavity, wherein the heat exchange tube is vertically arranged, the top end of the heat exchange tube is opened, the bottom end of the heat exchange tube is closed, the heat exchange tube is located in the heat medium cavity, the top end of the heat exchange tube communicates with the water outlet cavity, the inner tube is inserted into the bottom end of the heat exchange tube from the top end of the heat exchange tube, the top end of the inner tube communicates with the water inlet cavity, the bottom end of the inner tube communicates with the heat exchange tube cavity, the heat medium cavity is used for containing a flowing heat medium, and the heat medium flows in the heat medium cavity from bottom to top. The heat exchange tube and the inner tube are vertically arranged, and the heat medium longitudinally flows from bottom to top to wrap the heat exchange tube, so that the evaporator is of a vertical structure, the tube side pressure loss is small, the evaporator is suitable for a natural circulation system, and meanwhile, the tube plate temperature is uniform, the thermal stress is small, and damage is not likely to be caused.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a vertical vertical flow evaporator. Background technique [0002] The evaporator is widely used in waste heat utilization and heat storage systems. It uses the heat of the heat medium to heat the feed water to generate steam, so as to provide steam to the subsequent sections, which is an important link in heat conversion. Currently commonly used evaporators include U-shaped tube heat exchangers, hairpin heat exchangers and other types. For U-shaped tube heat exchangers, since the inlet and outlet media of the tube side are in contact with different parts of the same tube sheet, when the temperature difference between the inlet and outlet media is relatively large, the thermal stress of the tube sheet is relatively large, which is easy to cause damage. For the hairpin heat exchanger, although it solves the problem of large temperature difference stress on the tube sheet, its press...

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Problems solved by technology

[0003] The purpose of the present invention is: for the existing U-shaped tube heat exchanger in the prior art, the thermal stress of the tube plate is relatively large, which is easy to cause damage, while the existing hairpin heat exchanger has a large pressure loss, which is not suitable for natural heat exchangers. For the problem of circulating evaporation system, a vertical longitudinal flow evaporator is provided

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