Leakage detection method, device and system for No.3 high-pressure heater of steam turbine

Abstract

The invention relates to a leakage detection method, device and system for a No.3 high-pressure heater of a steam turbine, seven leakage criteria are obtained by establishing a No.3 high-pressure heater fault model, and boundary conditions for triggering leakage early warning of the No.3 high-pressure heater are provided. Compared with the prior art, different fault judgment models are developed according to different leakage modes of the third high-pressure heater, early warning can be carried out when the third high-pressure heater leaks from the water side to the steam side, early warning can also be carried out when the third high-pressure heater leaks from the steam side to the drain side, leakage of the high-pressure heater can be found in time and early warning can be carried out, further expansion of leakage can be effectively prevented, and safety accidents are avoided.

Description

technical field [0001] The invention relates to the field of high-pressure heaters of steam turbines, in particular to a method, device and system for detecting leakage of No. 3 high-pressure heaters of steam turbines. Background technique [0002] Under the new situation of the electric power industry, the low-load operation time of coal-fired generating units has increased, and frequent start and stop have adversely affected the safety of unit operation. At the same time, the requirements for the operation safety of coal-fired power generation units are constantly increasing, and it is an urgent need to use new technologies to improve the safety level of units. [0003] As a heat conversion device, high-pressure heaters are widely used in steam extraction and heat recovery systems of large-scale thermal power units. The temperature difference between the furnaces improves the heat exchange efficiency. In the mainstream steam turbine system, there are three high-pressure ...

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Problems solved by technology

[0004] 1. The leaking pipe forms a high-pressure water supply impact on the surrounding pipe bundles, resulting in an increase in the number of leaking pipe bundles, and the leakage is becoming more and more serious

[0005] 2. The steam side leaks to the drain side, forming a steam-water two-phase flow in the drain pipe, which may easily cause the pipeline steam-water impact and affect the safe operation of the unit

[0006] 3. Leakage causes the water level of the high-pressure heater to rise, and there are risks such as decoupling of the high-pressure heater and decline in the load capacity of the unit

[0007] 4. Leakage causes the outlet water temperature of the heater to drop, and the high-quality heat is not fully utilized, which affects the final feed water temperature and reduces the operating economy of the unit

[0009] In the existing technology, the leakage of the No. 3 high-pressure heater is mainly judged by human beings. By observing the relevant data such as the operating end difference of the heater and the temperature of the feed water, and relying on rich operating experience to make judgments, the ability and experience of the operating personnel are relatively high. , when the personnel found that the relevant parameters of the No. 3 high-pressure heater were abnormal, an obvious leakage had occurred, which had an adverse effect on the safety and economic operation of the unit, and lacked an intelligent early warning method for the leakage of the No. 3 high-pressure heater

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