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| Contamination and Prevention of Drying Waste Gas during Processing Sludge in the Cement Kiln |
| 1 School of Materials Science and Engineering, South China University of Technology 2 Jiaying University |
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Abstract Contamination and prevention of drying waste gas during processing municipal sewage sludge in the cement kiln were investigated, utilizing HAPSITE portable gas chromatograph/mass spectrometer and N(1-naphty1)-ethylene diamine dihydrochloride spectrophotometric method to measure the waste gas composition. The results show that, offensive odor off-gases are produced from the municipal sewage sludge with a high moisture content during the drying process, the composition of which includes ammonia, hydrogen sulfide, aromatic compounds, halohydrocarbon and so on and the direct emission of which contaminates the environment. The waste gas, from sewage sludge drying using the fresh hot air, can combust with pulverized coal at 950℃, which not only leads to the decomposition of several harmful components in the waste gas but also reduces the NOx concentration. The approach to directly dry the sludge with kiln back-end waste gas is questionable. It is suggested that the hot gas from cement rotary kiln shell cooling or the clinker cooler is recovered and used to dry sewage sludge, following which the waste gas enters the kiln for combustion.
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Received: 05 September 2011
Published: 19 June 2018
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| [1] |
JI Lei, ZHAO Xuhong, CAO Pei, ZHAO Yu, SUN He, HUANG Yongsheng, WEI Juan, ZHANG Guangfang, YU Gang, WU De Hou, . Study of Typical Pollutants' Solidification in Clinker in the Co-processing Hazardous Waste in Cement Kiln[J]. Cement Technology, 2018, 1(2): 31-35. |
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