Two-phase flow heat exchange experimental device

Abstract

The invention relates to the technical field of natural gas liquefaction, in particular to a two-phase flow heat exchange experimental device. The device comprises a heat exchange core arranged in a shell and used for tube pass fluid to flow through, a distribution device used for distributing shell pass fluid, a tube pass inlet tube box and a tube pass outlet tube box which are connected to the two ends of the heat exchange core respectively and are arranged on the shell, and a shell pass inlet and a shell pass outlet which are connected to the two ends of the distribution device respectivelyand are formed in the shell. The shell pass inlet comprises a positive inlet connecting pipe vertically connected to the distribution device and a side inlet connecting pipe horizontally connected tothe distribution device; the heat exchange core comprises a heat exchange pipe and a central column, the heat exchange pipe is spirally wound on the central column, and the winding position of the heat exchange pipe on the peripheral side of the central column is matched with a shell pass fluid distribution hole formed in the distribution device. The device is convenient to operate, can realize visualization of a shell pass fluid flow pattern, can be used for researching shell pass two-phase flow distribution, the fluid flow pattern, a heat transfer and resistance drop calculation model and the like, optimizes two-phase flow fluid distribution, and improves the heat exchange efficiency.

Description

technical field [0001] The invention relates to the technical field of natural gas liquefaction, in particular to a visual two-phase flow heat exchange experimental device. Background technique [0002] As a clean energy, liquefied natural gas has become an important part of my country's energy supply. In the production process of liquefied natural gas, the liquefaction process is the key link. In the liquefaction process, the main cryogenic heat exchanger (MCHE) is the key equipment to realize the cooling, condensation and liquefaction of natural gas. At present, the use of mixed refrigerants to liquefy natural gas is the mainstream liquefaction process in the world, with high liquefaction efficiency. Due to its compact structure and high heat transfer efficiency, the wound tube heat exchanger has good applicability in large-scale liquefaction plants. The mixed refrigerant undergoes falling film evaporation on the shell side to provide cooling capacity for the tube-side n...

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Problems solved by technology

At present, the heat transfer and flow mechanism and calculation model of the real medium shell-side two-phase flow falling film evaporation of the coiled tube heat exchanger have not been clear, and the heat transfer and resistance calculation of the LNG liquefaction coiled tube heat exchanger is only based on some existing According to the traditional theory, the calculation results are inaccurate, resulting in insufficient or too large heat transfer area, which in turn results in increased operating costs or equipment investment

In addition, the distribution of the shell-side two-phase flow has a significant impact on the shell-side falling film evaporation of the wound tube. In the prior art, there is no research on the impact of the shell-side fluid distribution on the heat transfer calculation, which leads to the fact that the fluid distribution is not considered in the heat transfer calculation. Influence, which restricts the optimal design of two-phase flow wound tube heat exchanger

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