Water level control method for boiler steam drum

Abstract

An embodiment of the invention provides a water level control method for a boiler steam drum and belongs to the technical field of boiler control. The method comprises the steps as follows: when the initial actual water level is not in the expected boiler steam drum water level range, the initial steam pressure and the initial steam temperature in a boiler are detected, the real-time steam quantity is calculated according to the initial steam pressure and the initial steam temperature, and a boiler adjusting valve is controlled for addition of the initial water injection quantity not smaller than the actual steam quantity; after the initial water injection quantity is added, a water level sensor is reused for detecting the subsequent actual water level of the boiler steam drum, the subsequent steam pressure and the subsequent steam temperature in the boiler are detected again, and the boiler steam drum water level theoretic value at the moment is calculated according to the subsequent steam pressure and the subsequent steam temperature; the deviation value of the subsequent actual water level relative to the boiler steam drum water level theoretic value is calculated, and the adjusting valve is controlled again on the basis of the deviation value to input the subsequent water injection quantity corresponding to the deviation value. Thus, the water level of the boiler steam drum is adjusted automatically.

Description

technical field [0001] The invention relates to the technical field of boiler control, in particular to a method for controlling the water level of a boiler drum. Background technique [0002] The boiler steam drum is a key component of the natural circulation boiler, and whether it can work normally is directly related to the safety of the water circulation in the boiler and the quality of the output steam. As one of the important operation control targets of the boiler, the drum water level is a key parameter reflecting the balance of energy and working medium in the boiler, which has a serious impact on the safe operation of the boiler. If the water level of the steam drum is too high, it will cause the steam to carry water, which will deteriorate the quality of the steam, and may damage the pipeline, steam turbine and other equipment. and water wall burnout. [0003] In order to control the water level of the boiler drum, it is proposed in the related art to artificial...

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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a water level control method of the boiler drum, which is used to solve the huge labor cost of manual operation in the prior art and the possibility of operating errors that prevent the water level of the boiler drum from being accurately adjusted to the desired level. Technical issues with location

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