水泥炉窑中低温催化脱硝技术中试性能

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Abstract Low temperature selective catalytic reduction (SCR) combined with low-nitrogen combustion and selective non-catalytic reduction (SNCR) were used for deep De-NO_x in a cement kiln. The SCR pilot plant with a flue gas of 10000m³/h was designed and constructed. The De-NO_x effect of SCR using residual NH₃ after SNCR was investigated, and the influence of inlet NO_x concentration on the catalytic efficiency was also studied. To meet the emission standard, the SNCR and low-NO_x burner techniques were carried out and the concentration NO_x in flue gas was 100~135mg/m³. The De-NO_x efficiency of SCR could reach more than 50% without the ammonia injection, which indicated the existence of NH₃ slip of SNCR. With the increase of ammonia injection quantity, the De-NO_x efficiency of SCR can be significantly improved. After a long time of test, the proposed De-NO_x technology scheme could stably and effectively control the NO_x emission in flue gas, and could meet the ultra-low emission standard. Finally, the influence of dust on the micropore blockage of catalyst was investigated, which indicated that the soot blowing system of catalyst was very important to guarantee the performance of catalyst.

Key words： cement kiln flue gas De-NO_x low-temperature SCR pore blockage pilot study

Received: 23 November 2020

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X511

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	Articles by authors
	LIU Huai-ping
	YIN Hai-bin
	XIONG Shang-chao
	FANG Jing-rui
	LI Jun-hua

Cite this article:

LIU Huai-ping,YIN Hai-bin,XIONG Shang-chao等. A pilot scale study of low-temperature De-NO_x in cement furnace[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3169-3175.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3169

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