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Air leakage detection method of condenser

An air detection and condenser technology, which is applied in the detection field, can solve the problems of increased end difference and reduced heat transfer performance of the condenser, and achieves the effect of wide application prospects.

Active Publication Date: 2014-01-29
XI AN JIAOTONG UNIV
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Problems solved by technology

In actual operation, the main factors affecting the vacuum of the condenser are excessive air leakage and scaling on the water side; since these two factors will cause the heat transfer performance of the condenser to decrease and the end difference to increase, the existing operation It is difficult for monitoring methods to distinguish the influence of these two factors

Method used

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  • Air leakage detection method of condenser
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  • Air leakage detection method of condenser

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Figure 2-4 It is the change law of the relative content of air in the steam, heat transfer coefficient and temperature rise of circulating water in heat exchange tubes during the condensation process obtained by numerical simulation at the same heat load of a supercritical 600MW unit condenser, under two different air leakage amounts . It can be seen from the figure that in most areas, the relative content of air in the steam is very low, and its heat transfer coefficient and temperature rise of circulating water remain constant; after a certain critical point, the relative content of air increases sharply, while The heat transfer coefficient and the temperature rise of the circulating water drop sharply. The position where the critical point appears is related to the amount of air leakage, the larger the amount of air leakage, the earlier this poin...

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Abstract

The invention provides an air leakage detection method of a condenser, comprising the following steps of: firstly, measuring the temperature of a circulating water inlet ti, the temperature to of a water outlet and the temperature to' of a water outlet of circulating heat-exchange pipe of a discharging steam inlet region; and then calculating whether an air leakage quantity of the condenser exceeds a monitoring index A or not according to a formula. According to the air leakage detection method of the condenser, the temperature rising of the circulating cooling water in each region of the condenser is measured so as to realize the detection of the air leakage quantity of the condenser. The method is efficient and reliable, is simple and feasible and has important meaning to guide the efficient and safe operation of the condenser of a heat-engine plant.

Description

technical field [0001] The invention belongs to the detection field, and in particular relates to a method for detecting air leakage of a condenser. Background technique [0002] The condenser is a shell-and-tube heat exchanger that uses circulating water to cool water vapor, in which the circulating water absorbs heat inside the tube bundle, and the water vapor condenses and releases heat outside the tube bundle. [0003] Non-condensable gases have an important influence on the heat transfer performance of water vapor condensation. Studies have shown that in the process of water vapor condensation heat transfer, when the non-condensable gas content exceeds 0.2%, the condensation heat transfer coefficient will drop significantly; and when the non-condensable gas content is lower than 0.2%, the condensation heat transfer coefficient will be Basically unaffected. [0004] Condenser is one of the important auxiliary machines of thermal power units. The condensers of existing ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/32
Inventor 严俊杰刘继平朱彦雷种道彤邢秦安
Owner XI AN JIAOTONG UNIV
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