Test system for evaluating local condensing heat transfer performance of mixed steam

Abstract

The invention relates to a test system for evaluating the local condensing heat transfer performance of mixed steam. The test system comprises a steam system, a cooling water loop and a data collection system, wherein an air compressor and an air drier of the steam system are connected, air enters a gas mixer together with steam in a boiler after passing through the air drier, and mixed gas enters a test section after being sufficiently mixed in the gas mixer; a water pump of the cooling water loop is used for conveying cooling water to the test section through a flowmeter from a water channel, a cooling water outlet of the test section is connected with an auxiliary cooling device, and the auxiliary cooling device is then connected with the water channel; four valves are arranged at the inlets and outlets of the test section, and are used for controlling the flow rates and pressures of the steam and cooling water respectively. The influence of non-condensable gas on condensation inside a horizontal light pipe can be evaluated by contrasting local condensing 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 steam in the presence of non-condensable gases has many applications, such as air conditioning, power generation, refrigerators, reactor safety, space, seawater 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 steam from the oxidation reactor. Compared with the vertical condensers, the hori...

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Problems solved by technology

[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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