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Industrial test on sieve residue of aged refuse as an alternative fuel for cement kiln

LI Chun-ping,Zhan Yong-li,Ji Yan-jun Beijing Building Materials Academy of Science Research,Solid Waste Resources Utilization and Energy Saving Building Materials State Key Laboratory,Beijing 100041,China  
Re-processing of aged refuses with the heating value of 12 500kJ/kg or even more,and chlorine content about 0.13%,was fed into cement kiln as an alternative fuel by a screw conveyor.The results showed that the measured concentration and emission rate of NOx were decreased significantly,and the measured concentration and emission rate of TSPs,HCl,HF,SO2 and CO that from exhaust gas were increased and fluctuated significantly after adding alternative fuels.Dosage of 2.5t/h of alternative fuels affected little on kiln system,the main process parameters were normal and had no more substantial fluctuations,but the amount of feeding coal at calciner were adjusted more frequently.Element of S in hot raw materials feeding into kiln seemed no significant changes while K and Cl content was increased significantly within the manageable range.The compressive strength,flexural strength and water requirement for normal consistency all reduced when using alternative fuels,but it was not significant.The initial setting time and final setting time were elongated while the lime-saturation factor of clinker was decreased significantly.
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