Coal gangue blending combustion anti-coking treatment method

Abstract

The invention relates to a coal gangue blending combustion anti-coking treatment method, which comprises the following steps of: adding coal gangue according to the following dosage ratio: the content of components in the ash of the raw coal and the mass content of total components in the ash of the co-fired coal gangue meet the conditions that J = (Fe2O3 + CaO + MgO + Na2O + K2O) / (SiO2 + Al2O3 + TiO2) is smaller than 0.5, R = 1.24 * J + 0.28 * SiO2 / Al2O3-1.9 * SiO2 / (SiO2 + Fe2O3 + CaO + MgO) + 5.4 is smaller than 1.5, the content of Na2O in the ash is smaller than 2.0%, and all the components refer to the mass content. According to the method, boiler coking is effectively relieved and inhibited, high-load, economical, safe and stable operation of the boiler is guaranteed, the method is low in cost and easy to implement, the problems of coking, ash blocking and loading of the boiler are effectively inhibited, and meanwhile the operation cost of the boiler is reduced.

Description

technical field [0001] The invention relates to the technical field of boiler anti-coking treatment, in particular to an anti-coking treatment method for coal gangue mixed firing. Background technique [0002] At present, the existing power plant boilers and industrial boilers are mainly coal-fired, but due to the deviation and change of the coal quality used, most of the boilers have more or less coking, slagging and other phenomena. Xinjiang Guanghui New Energy Company power station boiler also has relatively serious coking phenomenon, which will seriously endanger the safety and economy of boiler operation, and even be forced to shut down the boiler. Therefore, preventing and reducing coking is very important in boiler design and operation. The problem. [0003] Some power plant boilers have varying degrees of coking phenomenon. Due to severe coking in some power plants, boiler output is reduced by 10% to 20%, and thermal efficiency is reduced by 1% to 2.5%. The coking ...

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Problems solved by technology

[0003] Some power plant boilers have varying degrees of coking phenomenon, and some power plants have reduced boiler output by 10% to 20% and thermal efficiency by 1% to 2.5% due to severe coking

The coking in the furnace will increase the heat transfer resistance of the heating surface, reduce the radiation heat absorption of the cold wall, increase the temperature of the flue gas at the furnace outlet, and affect the water circulation condition, causing the convection heating surface to overheat due to the increase in heat load; the burner Coking at the nozzle and its vicinity will change the jet flow and power conditions in the furnace, affecting air powder mixing and combustion; coking at the heating surface at the furnace outlet will affect the heat transfer of the heating surface, even affect the steam temperature, and increase the ventilation resistance. Smashing the water wall and cold ash hopper may cause the furnace to extinguish the fire

Some boilers with serious coking not only affect the normal operation, but also forced to adopt directional blasting method when the boiler is shut down to clean the coke, which can easily cause destructive consequences

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