the technical research on the ultra-low emission transformation scheme of 3×150 t/h coal-fired boiler of a power plant in Jingzhou,Hubei Province is proposed:①In view of the excessive nitrogen oxides,boiler transformation measures such as water-cooled air chamber,fur-nace outlet to separator inlet acceleration section,lower part of separator cone section to lower part of furnace water-cooled wall,optimization of return air system,secondary air system,and furnace heating surface transformation are adopted,in which the boiler heating surface is trans-formed with boiler low nitrogen combustion and all the water walls below the 14m floor are replaced.Increase part of the heating area and re-duce the original emission of the boiler;②In view of the situation of sulfur dioxide exceeding the standard,improve the limestone feeding sys-tem,improve the timeliness of limestone feeding,it is feasible to meet the ultra-low emission only by desulfurization in the furnace,and re-place the equipment damaged by semi-dry desulfurization at the same time;③In view of the excessive dust,replace the existing bag filter bag with a new type of ultra-low emission filter bag,and the outer layer of the filter bag is ultra-fine fiber,which has high filtration accuracy and can ensure that the dust is discharged up to the standard.
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