Method for correcting fuel calorific capacity of coal-fired boiler in real time

Abstract

The invention discloses a method for correcting fuel calorific capacity of a coal-fired boiler in real time, and belongs to the field of thermal parameter measurement of boilers. The method comprises the following steps: firstly, judging whether the coal-fired boiler is in a stable condition; secondly, calculating a coal working capability coefficient in real time according to an overall fuel amount, a unit load and a coal consumption rate of unit power generation under the stable condition; and finally, converting the quotient of the obtained coefficient and a reference coal working capability coefficient into a fuel calorific capacity correction coefficient. The fuel calorific capacity correction coefficient is introduced into a fuel regulation and control system of the boiler to obtain an overall fuel amount reflecting the change of fueled coal. The method can calculate the coal working capability in real time to regulate an overall coal supply amount of the unit, and can effectively overcome the strong influence of the substantial change of the fueled coal on the running stability and the economy of the unit.

Description

technical field [0001] The invention belongs to the field of boiler thermal parameter measurement, in particular to a method for real-time correction of fuel calorific value of a coal-fired boiler. Background technique [0002] Most coal-fired power plants use coal as the main fuel, and coal used for electricity includes almost all types of coal, but their characteristics vary greatly. Even for the same type of coal, its low calorific value, ash content, sulfur content, etc. vary widely with different production areas, mine sites, mining years, and depths. In addition, some power plants actually use coal All kinds of low-quality fuels such as washed medium coal and washed coal have undoubtedly increased the variation of actual coal quality. [0003] The large change of fuel coal quality strongly affects the stability and economy of unit unit operation. An important part of the unit fuel control system is the fuel calorific value correction circuit (fuel BTU correction). T...

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Problems solved by technology

[0006] The biggest problem in the above method (1) is that it is difficult to accurately distinguish the dynamic and static components of the coal quality changes reflected by the load command and the heat load deviation

The biggest problem with method (2) is that the coal quality cannot be measured online, and there is a serious lag in manual input, and it is completely manual operation by the operator, which is difficult to complete automatically

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