Title: Analysis of the influencing factor in boiler combustion adjustment
ABSTRACT
The condition of boiler combustion carries great significance in the boiler unit and the security and the economy of the whole power plant operation.In safety aspect,the stability of the burning process has direct relationship with the reliability of the boiler operation;in economic aspect,the condition of the boiler combustion has direct relationship with the economics of the boiler operation.
The economic requirements entails appropriate fit between wind and pulverized coal in the burning process.Besides,appropriate furnace box temperature must be provided.In this paper,the effects of boiler fuel adjustment,the boiler wind amount adjustment,the burner outlet wind velocity and wind rate adjustment and the boiler furnace negative pressure control on the influence of the boiler combustion adjustment is analysed.The boiler fuel adjustment and the combustion adjustment is vital.Different combustion equipment and different kinds of fuel corresponding to different fuel adjustment methods.The adjustment of wind amount is needed when boiler load is required due to external load changes with the changes of the fuel amount.Too big or too small air amount will give the safe and economic concerns on the operation of boilers.Keep appropriate burner outlet first,second,third wind velocity and wind rate is essential to establish the normal air field and stable combustion in the furnace.Large negative pressure in the furnace can lead to air leak in the furnace and flue,eventually，the burns deterioration and fire extinction will be introduced.On the contrary,if the furnace wind pressure changes,the high temperature fire and ash will go out of the furnace,thus,affecting the sanitation and can damage equipment and pose threat to people.The furnace negative pressure must be monitored in the boiler operation and right judgment is required according to different conditions and in-time regulating and dispose is needed.
This paper is focus on the combustion adjustment of the 2×300MW coal-fired units in Huaneng Xindian thermal power plant,especially utilize the anthracite and bituminous coal,even the brown coal without the design coal(Southeast Shanxi lean coal) due to coal market reasons.The effects of anthracite and bituminous coal burning on the adjustment is emphasized in this paper.
Key words:Boiler combustion adjustment;fuel amount; wind amount;coal types
Paper type: fundamental application
