Vertical evaporator

Abstract

The invention relates to a vertical evaporator which comprises a vertically-arranged cylindrical evaporator shell, and a sealing cover is arranged above an upper end tube plate. A cavity is formed between the sealing cover and the upper end tube plate, a vertically upward air suction tube is arranged in the center of the sealing cover, and the cavity of the sealing cover is communicated with a refrigerating medium inlet and a refrigerating medium outlet through heat exchange tubes to form a refrigerating medium loop. A supporting plate assembly used for supporting and connecting the heat exchange tubes is arranged in the evaporator shell below an air suction port, and the supporting plate comprises at least one heat exchange tube supporting plate fixedly connected through a vertical pull rod and at least one air baffle arranged at an interval and located above the heat exchange tube supporting plate. Compared with the prior art, the vertical evaporator has the advantages of simple structure, high heat exchange efficiency and the reduction of risk of air suction with liquid.

Description

technical field [0001] The invention belongs to the technical field of industrial refrigeration and heat exchange, and in particular relates to a vertical evaporator structure for a chiller. Background technique [0002] Heat exchangers are common equipment in chemical industry, petroleum, power, food and many other industrial sectors, and play an important role in production. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are more widely used. [0003] Heat exchangers can be divided into horizontal heat exchangers and vertical heat exchangers in form, and their differences are mainly as follows: [0004] Horizontal heat exchanger: stable and safe, able to withstand high working pressure and temperature; large footprint, low installation space clearance requirements, easy maintenance and cleaning, generally do not need a platform; hot and cold fluids can flow countercurrently Flow; medium heat trans...

AI Technical Summary

Problems solved by technology

[0006] The evaporator is a device that evaporates the liquid refrigerant into a gaseous state. The liquid refrigerant will boil violently during the heat exchange process; usually a certain space height is reserved between the liquid state and the gas state refrigerant to ensure that the evaporator does not suck air. Liquid-filled; for horizontal shell-and-tube evaporators, usually in order to ensure such a space height, no tubes are arranged in the upper half of the tube sheet section (the tube layout rate is not high, about 50%), resulting in a large heat exchanger , the disadvantage of high material cost; and the vertical evaporator structure not only occupies a small area, but also can greatly increase the tube sheet layout rate (up to 80% to 95%), reduce the volume of the heat exchanger, and reduce the cost of materials ; But the existing vertical evaporator structure is rarely used due to the following technical shortcomings;

[0007] 1) The medium in the shell side of the flooded evaporator is refrigerant, and the suction port 3 and the liquid refrigerant inlet 4 are set horizontally. In order to avoid the compressor suction with liquid, the refrigerant liquid level 2 needs to be lowered below the suction port 3 position, causing part of the heat exchange tube 1 to be exposed in the gaseous refrigerant, and the heat exchange tube 1 cannot be used for heat exchange, resulting in low heat exchange efficiency of the evaporator, such as figure 1 shown

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