Balanced combustion system of opposed firing boiler and operation method

Abstract

The invention discloses a balanced combustion system of an opposed firing boiler and an operation method. Flue gas analyzers which are in one-to-one correspondence to main burners and burn-out air burners in position are arranged on a tail flue along the width direction of a hearth to obtain the concentration deviation condition of carbon monoxide in exhaust smoke along the width direction of thehearth; according to the positive and negative concentration deviation condition of the carbon monoxide, air volume adjusting devices and rotational flow adjusting devices of the corresponding main burners and burn-out air burners of the opposed firing boiler are automatically adjusted; and finally the concentration deviation of the carbon monoxide in the opposed firing boiler along the width direction of the hearth is reduced, so that balanced combustion of the boiler in a low-nitrogen combustion mode is achieved. The problems of steam temperature / smoke temperature deviation, overtemperatureof a heating surface, coking of a hearth, poor low-load stable combustion capacity and the like caused by deviant combustion of the boiler can be effectively relieved, meanwhile, incomplete combustionlosses of solids and gases of the boiler can be reduced, and the heat efficiency of the boiler is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power station boiler operation, and in particular relates to a balanced combustion system and an operation method of a counter-contrast coal-fired boiler. Background technique [0002] my country is a big coal-fired power generation country, and the installed capacity of coal-fired generators ranks first in the world. Affected by the complex and changeable coal quality of most coal-fired power plants in my country, the safety, economy and environmental protection characteristics of coal-fired boiler operation have always been the focus of attention of the majority of electric power professionals. [0003] Affected by the uneven air distribution and powder distribution of the boiler, the phenomenon of "partial burning" of coal-fired boilers occurs from time to time. If the parameters are not up to the rated value, it may even cause the heating surface of the boiler to overheat, which will affec...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the shortcomings of the traditional manual adjustment technology of "partial burning" of the opposed burner boiler, especially the limitation that the change of the mill operation mode will affect the traditional adjustment effect, and provide A balanced combustion system and operation method for opposed coal-fired boilers are proposed. By installing a flue gas analyzer corresponding to the position of the main burner and the overfired air burner in the tail flue along the width direction of the furnace, the gas analyzers along the width direction of the furnace are obtained. According to the deviation of carbon monoxide concentration in the flue gas, according to the positive and negative deviation of carbon monoxide concentration, the air volume and swirl adjustment device of the main burner and the overfire air burner of the counter-fired boiler are automatically adjusted, and finally the counter-fired boiler is reduced along the width of the furnace. The deviation of carbon monoxide concentration can realize the balanced combustion of the boiler under the low-nitrogen combustion mode, which can effectively alleviate the problems caused by the partial combustion of the boiler, such as the deviation of steam temperature / smoke temperature, overheating of the heating surface, coking of the furnace, and poor combustion stability. Boiler solid and gas incomplete combustion loss, improve boiler thermal efficiency

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