A Test System for Evaluating the Heat Transfer Performance of Local Condensation of Mixed Vapor

Abstract

The invention relates to a test system for evaluating the local condensation heat transfer performance of mixed steam, which includes a steam system, a cooling water circuit and a data acquisition system; the air compressor of the steam system is connected with an air dryer, and the air passes through the air dryer and is discharged into the boiler The steam enters the gas mixer together, and the mixed gas enters the test section after being fully mixed by the gas mixer; the water pump of the cooling water circuit transports the cooling water from the water tank to the test section through the flow meter, and the cooling water outlet of the test section and the auxiliary cooling device The auxiliary cooling device is connected to the water tank; the inlet and outlet of the test section are equipped with 4 valves to control the flow rate and pressure of steam and cooling water respectively. The present invention can evaluate the influence of the non-condensable gas on the condensation in the horizontal light pipe by comparing the local condensation heat transfer coefficients.

Description

【Technical field】 [0001] The invention relates to the field of heat transfer performance testing, in particular to a device for testing the local condensation heat transfer coefficient of mixed steam. 【Background technique】 [0002] Condensation of vapor in the presence of non-condensable gases has many applications, such as air conditioning, power generation, refrigerators, reactor safety, space, desalination, and some heat exchangers. However, we still lack a detailed understanding and prediction of it, especially for the condensation of vapors in the presence of high-quality components. Purified terephthalic acid (PTA) is an important raw material for the production of polyester (PET). With the development of the economy, the demand for PTA has increased dramatically in the past 20 years. In its production process, a series of horizontal condensers are needed to condense the mixed vapor from the oxidation reactor. Compared with the vertical condensers, the horizontal co...

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Problems solved by technology

However, this difference diminishes gradually along the flow direction, especially at higher noncondensable gas contents

[0004] Due to the asymmetry of condensation in the horizontal tube, it is difficult to study the internal condensation

However, the traditional studies on the condensation of non-condensable gases in pipes are mostly limited to vertical pipes.

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