Abstract:In order to study the effects of blending ratio onexhaust temperature

superheated steam temperature

carbon content in fly ashand slag

and boiler thermal efficiency

and put forward the correspondingoperation optimization method

mixed combustion experiments of COG (coke ovengas) with coal

BFG (blast furnace gas) with COG

and coal

BFG with COG wereperformed in a 75t/hcombined combustion boiler

respectively The results show that the boilerthermal efficiency can reach 827% under the condition of mixed combustion ofCOG and coal

but the operating mode is not economical for the gas balance ofplant When burning BFG and COG in the boiler

the boiler thermal efficiency canreach 852% but low loading operation After the mode of 35% BFG heat value

35%COG heat value and 30% lean coal heat value is applied in the boiler

theexhaust temperature

carbon content in fly ash and slag decreases by 45℃

106% and 109%

respectively The boiler thermal efficiency is 7721% Moreover

the fuel consumption reduces by 2261kg/h and the coal saving ratio is 33%