The influencing factors and improvement strategies of coking in the furnace of coal powder industrial boilers
Coking in the furnace seriously threatens the safe and stable operation of coal-fired boilers.The phenome-non of coking around the burner of a heating and hot water boiler and on the side walls of the back wall at the same level seriously affects the long-term operation of the boiler and increases safety hazards.By observing the coking situa-tion for a long time and analyzing the impact of the chemical composition of coal ash on coking,combined with the mechanism of coking in coal-fired boiler combustion,measures such as optimizing the oxygen content of boiler opera-tion,increasing the proportion of internal secondary air,reducing the particle size of coal powder,and optimizing coal types are taken to compare and analyze the coking phenomenon under different conditions,in order to explore improvement strategies to slow down the coking process in the furnace.Research has found that coal type is the most important factor affecting coking during combustion in coal powder industrial boilers,and optimizing coal powder par-ticle size and air distribution also has a certain impact;through on-site sampling,the coal quality and ash composi-tion of the coal powder used in the boiler were compared and analyzed,and the slagging discrimination index was cal-culated based on the ash composition.The results showed that the ash melting temperature of the coal used in the boiler combustion was relatively low,and the ash softening temperature was 1 170 ℃,which belongs to the typical coal type that is prone to coking and has serious slagging.Based on comprehensive analysis,it is believed that the change in coal type during boiler combustion and the lower ash melting temperature of coal are the most essential fac-tors affecting coking during coal powder industrial boiler combustion.To further solve practical problems on site,measures such as breaking the acid-base ratio in coal ash and increasing the silicon ratio,increasing the ash melting temperature of coal,and adjusting the particle size of coal powder are taken.The continuous operation time of the ad-justed boiler has been significantly extended,and the coking condition has been improved,indicating that the com-bustion adjustment improvement measures have achieved good results.
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