Design method of spiral wounded heat exchanger with shell side boiling and tube side condensation

Abstract

The invention discloses a design method of a spiral wounded heat exchanger with shell side boiling and tube side condensation. According to a bubble point and a dew point of a working medium, a shell side is divided into two parts, namely a liquid phase section and a boiling section, or the shell side is divided into three parts, namely a liquid phase section, a boiling section and a gas phase section, design calculation is respectively conducted on the corresponding sections, and the heat exchange coefficient, the heat exchange amount, the heat exchange area and the effective heat exchange length of each section are determined; if the dryness of the outlet section is smaller than 1, the shell side of the whole spiral wounded heat exchanger is divided into two parts, namely the liquid phase section and the boiling section; if the outlet dryness is equal to 1, the shell side of the whole spiral wounded heat exchanger is divided into three parts, namely the liquid phase section, the boiling section and the gas phase section; and phase change exists in the tube side condensation section, and the heat exchange coefficient is related to dryness. The design method of the spiral wounded heat exchanger has the advantages of being high in calculation precision, complete in design method, high in calculation efficiency and the like, and has high commercial value and market promotion value.

Description

technical field [0001] The invention relates to the technical field of coiled tube heat exchangers, in particular to a design method for a coiled tube heat exchanger with shell-side boiling and tube-side condensation. Background technique [0002] Wound tube heat exchanger has large heat transfer area per unit volume, small footprint, high heat transfer coefficient, small heat transfer temperature difference, high heat transfer efficiency, high pressure resistance, self-compensation for thermal expansion, not easy to scale, and easy to realize large-scale It also has the function of realizing simultaneous heat transfer of multiple media. Wound tube heat exchangers are mainly used in air separation, liquefied natural gas and other industries. In recent years, with the large-scale development of petrochemical, coal chemical, and liquefied natural gas plants, coiled tube heat exchangers have been widely used due to their high heat transfer efficiency and compact structure. Fo...

AI Technical Summary

Problems solved by technology

The process calculation of this type of heat exchanger is very complicated, involving heat transfer processes such as phase change, no phase change, single stream, multiple streams, etc.

However, so far, there is no mature forward design method in China, especially the simple counterfeit reverse design, which has not reached the core competitiveness of the international level in terms of design level and manufacturing capacity.

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