Boiler water supply de-aerator temperature rise automatic control method and system

Abstract

The invention discloses a boiler water supply de-aerator temperature rise automatic control method and system. After a temperature rise instruction is received, opening degree of an auxiliary steam supply regulating valve is gradually increased according to certain rate so that a de-aerator is heated. Meanwhile, according to change situation of temperature of the de-aerator with combination of regulations and requirements, opening degree of the auxiliary steam supply regulating valve is corrected so that temperature rise speed and temperature rise acceleration of the de-aerator are enabled to meet the regulations and requirements. When temperature of the de-aerator rises to 80 DEG C, pressure of the de-aerator is controlled. Finally, whole process control of temperature rise and pressure boost of the de-aerator is realized so that automation level of the machine set is enhanced, labor intensity of operation personnel is reduced, occurrence of a water attack phenomenon of the de-aerator caused by artificial mis-operation is avoided, and equipment safety is ensured.

Description

technical field [0001] The invention relates to the technical field of boiler power generation, in particular to an automatic temperature rise control method and system for a boiler feed water deaerator. Background technique [0002] The main function of the deaerator is to remove oxygen and other non-condensable gases in the boiler feed water to ensure the quality of the feed water. Because if oxygen is dissolved in water, the metal in contact with water will be corroded, and if gas accumulates in the heat exchanger, it will increase the thermal resistance of heat transfer and reduce the heat transfer effect of the equipment. Therefore, any gas dissolved in water is unfavorable, especially oxygen, which will directly threaten the safe operation of the equipment. Generally speaking, the deaerator of the thermal power unit needs to remove the non-condensable gas in the water, and the method adopted is the method of thermal deaeration. [0003] In order to make the chemical ...

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Problems solved by technology

[0005] The change process of the temperature of the deaerator is a big lagging object. In the actual operation process, it is generally controlled manually. The valve position of the auxiliary steam supply regulating valve is operated based on the experience of the operating personnel. This circuit has never been checked. Closed-loop control, and during the start-up process of the unit, the operating personnel have more operations. If they are not careful about the large lagging object, it will often cause the temperature rise rate of the deaerator to be too high, and the high temperature rise rate will cause water hammer. affect the security of the device

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