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摘要: 等离子体熔融飞灰是安全处置飞灰的方法之一。为了获取具有工程应用价值的数据,采用中试规模的等离子体炉在连续进料、出料状态下大批量地熔融飞灰,研究了熔渣、二次飞灰和尾气等产物的特性,测算熔融处理单位质量飞灰的能耗。结果表明:得到的水淬熔渣和自然冷却熔渣的密度分别为3.01和2.90 g/cm3;重金属浸出毒性远低于GB 5085.3—2007《危险废物鉴别标准 浸出毒性鉴别》的标准限值;所采用的等离子体装置在处理280 kg飞灰的连续试验中,飞灰处置能耗为1.12 kW?h/kg;二次飞灰的产率为7.1%,其主要成分为NaCl和KCl。Abstract: The plasma vitrification is one method of detoxification and disposal of municipal waste incinerator (MSWI) fly ash. To obtain key data for engineering application, MSWI fly ash was melted with a pilot scale plasma furnace at the conditions of continuous feeding and discharging. The properties of slag, secondary fly ash and off-gas were analyzed, and the energy consumption calculated. According to the test, the densities of slag quenched by water and air are 3.01 and 2.90 g/cm3, respectively. The leaching test results of heavy metals from the two kinds of slags were all below the limits in Identification standards for hazardous wastes-Identification for extraction toxicity (GB 5085.3-2007). During the pilot scale test, about 280 kg fly ash was melted, and energy consumption of fly ash melting was 1.12 kW·h/kg. The production ratio of secondary fly ash was 7.1%, with NaCl and KCl as its major components.
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Key words:
- municipal waste incinerator fly ash /
- plasma /
- vitrification /
- detoxification /
- heavy metals
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