There are two gas-fired annular shaft lime kilns in a calcium carbide factory,which produce lime for calcium carbide production.Through technical transformation in the past,the flue gas from the charge end of the two kilns is ducted to the carbon material drying device as the heat source for drying,thus achieving comprehensive utilization of waste heat and reducing energy consumption.However,the flue gas emissions cannot meet the relevant standards,and thus the transformation and upgrading for NOx reduction have been carried out to achieve better effect of emission reduction.This paper provides a detailed introduction to the synergistic de-NOx process technology for flue gas from the shaft kilns and the carbon material drying system.As a result,while reducing the consumption of pulverized coal,the total NOx emissions from the shared chimney of the shaft kilns and carbon material drying device are reduced from 328～345 mg/m3 to 143～163 mg/m3,which meets the relevant emission standards,thus increasing the economic and environmental benefits of the enterprise.
Annular shaft kilnCarbon material drying deviceSynergistic de-NOxLow-oxygen combustionFlameless combustion
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