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制革污泥在商业化循环流化床锅炉中的共燃烧。

Co-combustion of tannery sludge in a commercial circulating fluidized bed boiler.

机构信息

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.

出版信息

Waste Manag. 2015 Dec;46:227-33. doi: 10.1016/j.wasman.2015.08.004. Epub 2015 Aug 13.

Abstract

Co-combusting hazardous wastes in existing fluidized bed combustors is an alternative to hazardous waste treatment facilities, in shortage in China. Tannery sludge is a kind of hazardous waste, considered fit for co-combusting with coal in fluidized bedboilers. In this work, co-combustion tests of tannery sludge and bituminous coal were conducted in a power plant in Jiaxing, Zhejiang province. Before that, the combustion behavior of tannery sludge and bituminous were studied by thermogravimetric analysis. Tannery sludge presented higher reactivity than bituminous coal. During the co-combustion tests, the emissions of harmful gases were monitored. The results showed that the pollutant emissions met the Chinese standard except for NOx. The Concentrations of seven trace elements (As, Cr, Cd, Ni, Cu, Pb, Mn) in three exit ash flows (bottom ash in bed, fly ash in filter, and submicrometer aerosol in flue gas) were analyzed. The results of mono-combustion of bituminous coal were compared with those of co-combustion with tannery sludge. It was found that chromium enriched in fly ash. At last, the leachability of fly ash and bottom ash was analyzed. The results showed that most species were almost equal to or below the limits except for As in bottom ashes and Cr in the fly ash of co-combustion test. The concentrations of Cr in leachates of co-combustion ashes are markedly higher than that of coal mono-combustion ashes.

摘要

在中国,现有的流化床燃烧器协同燃烧危险废物是处理危险废物设施短缺的一种替代方法。制革污泥是一种危险废物,被认为适合与煤在流化床锅炉中协同燃烧。在这项工作中,在浙江省嘉兴市的一家电厂进行了制革污泥和烟煤的协同燃烧试验。在此之前,通过热重分析研究了制革污泥和烟煤的燃烧行为。制革污泥的反应性比烟煤高。在协同燃烧试验过程中,监测了有害气体的排放。结果表明,除了氮氧化物外,污染物排放符合中国标准。分析了三个出口灰流(床层底灰、过滤器飞灰和烟道亚微米气溶胶)中七种痕量元素(As、Cr、Cd、Ni、Cu、Pb、Mn)的浓度。将烟煤的单燃烧结果与制革污泥的协同燃烧结果进行了比较。结果发现,铬在飞灰中富集。最后,分析了飞灰和底灰的浸出性。结果表明,除了协同燃烧底灰中的 As 和飞灰中的 Cr 之外,大多数物质的浓度几乎等于或低于限值。协同燃烧灰分浸出物中 Cr 的浓度明显高于煤单燃烧灰分的浓度。

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