Water level control method and device for boiler steam drum

Abstract

The embodiment of the invention discloses a boiler drum water level control method and a boiler drum water level control device. The method comprises the steps of acquiring the display value of a water level gauge of a boiler drum at an interval of set period, determining whether the display value is equal to the optimal water level of the boiler drum, calculating the transient added water mass and the transient steam mass of the boiler drum if the display value is not equal to the optimal water level of the boiler drum, reducing the added water flow by a first set value if the transient added water mass is greater than the transient steam mass, and increasing the added water flow by the first set value if the transient added water mass is smaller than the transient steam mass. Compared with the method of adjusting the added water flow according to the steam flow in the prior art, the water level of the boiler drum can be accurately controlled to the optimal water level, sharp fluctuation of the water level of the boiler drum is avoided, and the gas-liquid conversion and energy efficiency ratio of the boiler drum are ensured.

Description

Technical field [0001] The invention relates to the field of automation technology, in particular to a method and device for controlling the water level of a boiler steam drum. Background technique [0002] The boiler drum is a key component of a natural circulation boiler. 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. The water level of the boiler drum is an important parameter that affects the smooth and high production of the boiler: if the water level of the boiler drum is too low, the amount of water in the boiler drum is less, and when the load becomes large, the water consumption in the boiler drum may accelerate and all may be vaporized. If the water level of the boiler drum is too high, because the boiler drum is usually a flat cylinder, the gas-liquid contact area becomes smaller, the gasification rate is reduced, and the steam entrains water phenomenon, and the temperature will...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for controlling the water level of the boiler drum, which is used to solve the problem in the prior art that the water level of the boiler drum cannot be accurately controlled, resulting in large fluctuations in the water level of the boiler drum, thereby affecting the gas-liquid conversion , and even affect the energy efficiency ratio of the boiler

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