Combustion controlling device, combustion controlling method, combustion controlling program, and computer-readable recording medium

Abstract

The purpose of the invention is to suppress heat loss from exhaust gas easily regardless of boiler type or load. To achieve this purpose, a combustion controlling device comprises: an excess air ratio setting unit that sets, on the basis of a main vapor flow rate from the boiler, an excess air ratio that is the ratio of the air volume to be injected into a boiler to the stoichiometric air volume; an excess air ratio correction volume calculating unit that calculates, on the basis of the oxygen concentration and the carbon monoxide concentration in the exhaust gas from the boiler, a correction volume for the excess air ratio to make the heat loss due to excess air substantially equal to the heat loss due to incomplete combustion; and an oxygen controlling unit that generates, on the basis of the corrected excess air ratio due to the correction volume and the oxygen concentration in the exhaust gas, an air setting correction signal that corrects the set value for the air volume.

Description

technical field [0001] The invention relates to a combustion control device for controlling fuel combustion in a boiler, a combustion control method, a combustion control program and a computer-readable storage medium. Background technique [0002] Currently, in technologies related to the combustion process of boilers, various control methods have been tried in order to realize energy saving and pollution prevention at the same time. For example, there is known a technique for performing optimal control with a low air excess ratio by adjusting the air flow rate by using an air setting signal for setting the air excess ratio characteristic according to the main steam flow rate of the boiler , plus the oxygen (O 2 ) density correction amount (for example, refer to Patent Document 1). The excess air ratio is defined as the ratio of the amount of air actually put into the boiler relative to the theoretical air amount, and is also called the air ratio. Here, the theoretical a...

AI Technical Summary

Problems solved by technology

According to the straight line 101, it can be seen that the larger the excess air ratio is than 1, the more the discharge of excess air will increase, so the heat loss will increase and the fuel cost will also increase.

On the other hand, according to the curve 102, it can be known that a small air excess ratio will lead to incomplete combustion, thereby generating carbon monoxide and increasing heat loss, and when it exceeds a certain threshold, soot will be generated

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