Experimental device and method for detecting NH4Cl crystallization characteristics of U-shaped heat exchange tube bundle

Abstract

The invention discloses an experimental device and method for detecting NH4Cl crystallization characteristics of a U-shaped heat exchange tube bundle. The main body material of the heat exchange tubebundle part is organic glass, and the heat exchange tube bundle is externally sleeved by an organic glass sleeve; a deposition probe is inserted into a bent pipe of the main body material, a pipe bundle inlet of the heat exchange tube bundle part is connected with a material inlet part, a pipe bundle outlet of the heat exchange tube bundle part is connected with a material outlet part, the organicglass sleeve is provided with an inlet and an outlet, and the inlet and the outlet of the organic glass sleeve are connected with a cooling system to form a circulation loop; and the heat flux density is calculated through the temperature difference between the inner surface and the outer surface of the deposition probe to characterize NH4Cl salt crystallization solution, and the crystallizationconditions of NH4Cl salt at different positions of the bent pipe of the heat exchange tube bundle are obtained. The method is simple to operate, obvious and visible in phenomenon, and can be used forsolving the problem of ammonium salt crystallization deposition corrosion of the U-shaped heat exchanger in the current petrochemical industry.

Description

technical field [0001] The invention belongs to a heat exchange tube bundle characteristic detection device and method in the technical field of petrochemical corrosion testing, in particular to a U-shaped heat exchange tube bundle NH 4 Experimental device and method for detection of Cl crystallization characteristics. Background technique [0002] Petrochemical industry is an important support for my country's energy industry. The heat exchanger is one of the important equipment in the process. It has been under high temperature and high pressure conditions for a long time, and it is very prone to unplanned shutdown accidents caused by flow corrosion such as deposition and erosion. It has become an important factor that seriously affects the healthy and sound development of the petrochemical industry. Therefore, the research on the flow corrosion failure of heat exchangers has always been the focus of attention in the academic and engineering circles. [0003] With the in...

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Problems solved by technology

However, the shortcomings of the current multiphase flow deposition experimental device mainly lie in the fact that the experimental device is not targeted at the deposition of specific reactants, the deposition process cannot be monitored in real time online, it is difficult to test the deposition critical characteristics of multiphase flow, and it is impossible to wash salt with water injection Mechanism research

[0004] In summary, for the tube bundle NH in the U-shaped tube heat exchanger 4 The characteristics of Cl salt crystallization deposition and the mechanism of salt washing by water injection are not clear. The existing technology lacks a U-shaped heat exchange tube bundle NH 4 Experimental Setup and Method for Cl Salt Crystallization Evaluation to Evaluate Tube Bundle NH 4 Degree of crystallization of Cl salts, quantification of NH 4 Crystallization rate of Cl salt reveals the mechanism of salt washing by water injection

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