Boiler control device and control method

Abstract

The invention discloses a boiler control device and control method. Even if multiple fuels are burned in a boiler, the NOx and non-combusted fuels can be controlled below an environment limitation value more reliably. The boiler control device comprises a storage part, which stores a plurality of basic information according to the operation state of a boiler, wherein the basic information comprises a control command value for burning multiple fuels; a basic information extraction part, which extracts basic information corresponding to the current operation state of the boiler from the storagepart; and a determination part, which determines the control command value by using the extracted basic information. The operation state of the boiler comprises at least one of the combination of fuels supplied to the boiler, the number of running crushers, and the number of running burners. The control command value comprises at least one of a first control command value related with the amount of air supplied to the boiler and a second control command value related with the angle between the direction of air ejected from the burner to the boiler and the horizontal direction.

Description

technical field [0001] The invention relates to a boiler control device and a control method. Background technique [0002] Usually, by-product gases generated in oil refineries, steel mills, etc. contain combustible components such as carbon monoxide and hydrogen and inert components such as nitrogen, and the calorific value of by-product gases varies with each generation location. In addition, by-product gases are A low calorific value gas whose composition is not always constant but sometimes changes. Representative examples of the by-product gas include coke oven gas (COG) generated from coke ovens, blast furnace gas (BFG) generated from blast furnaces, and the like. These by-product gases are used as fuel for boilers of thermal power generation equipment. Among the above-mentioned boilers, boilers of the type that co-fire various fuels (such as COG, BGF, coal, oil, etc.) are used, and each boiler is supplied with a mixing ratio of various fuels according to the supply...

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Problems solved by technology

[0009] However, in the method disclosed in the above-mentioned Patent Document 1, under the condition that the application of the preset combustion ratio has not been confirmed, it may not always be possible to calculate the appropriate air supply amount or other operation quantities related to the combustion state, resulting in Concerns about NOx and unburned fuel exceeding the environmental limit value

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