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首页> 外文期刊>Journal of the air & waste management association >The Calcination Process in a System for Washing, Calcinating, and Converting Treated Municipal Solid Waste Incinerator Fly Ash into Raw Material for the Cement Industry
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The Calcination Process in a System for Washing, Calcinating, and Converting Treated Municipal Solid Waste Incinerator Fly Ash into Raw Material for the Cement Industry

机译：洗涤，煅烧和处理后的城市生活垃圾焚烧炉粉煤灰转化为水泥行业原料的系统中的煅烧过程

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Calcination is the second step in a washing-calcination-conversion system in which treated municipal solid waste incinerator fly ash and bottom ash can be reused as raw material in the cement industry and can decompose or stabilize hazardous compounds, reduce residue amounts, and alter residue characteristics. In this research, only fly ash is discussed. Chloride reduction is important if treated fly ash is to be reused in cement; however, the relationship between washed fly ash properties and chloride reduction by calcination is not well understood. This study used washed residues of three types of fly ash—raw fly ash (RFA) from the boiler or economizer of an incineration system, fly ash collected in a bag filter injected with calcium hydroxide (Ca(OH)_2) for acid removal (CaFA), and fly ash collected in a bag filter injected with sodium bicarbonate (NaHCO_3) for acid removal (NaFA)—in calcination experiments with varying temperature (400-1100 °C) and atmosphere (100% nitrogen [N_2] at 25 mL/ min or 10% oxygen [O_2] [90% N_2] at fluxes of 25, 50, and 75 mL/min). From the perspective of chloride reduction, heating to 1000 °C with 1-hr heating time, 1-hr holding time, and an atmosphere of 10% O_2/90% N_2 was most suitable for calcination. Under these conditions, chloride levels were reduced by 91, 52, and 96% in washed residues of RFA, CaFA, and NaFA, respectively. Among the washed residues, the weight of the washed residue of NaFA decreased the most.
机译：煅烧是洗涤-煅烧转化系统中的第二步，在该系统中，经过处理的城市固体垃圾焚烧炉的粉煤灰和底灰可重新用作水泥工业的原料，并可分解或稳定有害化合物，减少残留物量并改变残留物特征。在这项研究中，只讨论了粉煤灰。如果要将处理后的粉煤灰重新用于水泥中，减少氯化物就很重要。然而，人们对洗涤后的粉煤灰特性和煅烧后的氯化物还原之间的关系还不甚了解。这项研究使用了三种类型的粉煤灰的洗净残渣，即来自焚烧炉锅炉或省煤器的粉煤灰（RFA），收集在袋式除尘器中的粉煤灰注有氢氧化钙（Ca（OH）_2），用于除酸（ CaFA）和收集在注入碳酸氢钠（NaHCO_3）的袋式除尘器中的粉煤灰以去除酸（NaFA）-在不同温度（400-1100°C）和大气环境（25％氮气中100％氮气[N_2]的煅烧实验中） / min或10％的氧气[O_2] [90％N_2]，流量为25、50和75 mL / min。从减少氯化物的角度来看，最适合煅烧的方法是加热时间为1小时，保持时间为1小时，O％为O_2 / 90％N_2的气氛为1000°C。在这些条件下，洗净的RFA，CaFA和NaFA残留物中的氯含量分别降低了91％，52％和96％。在洗涤残留物中，NaFA洗涤残留物的重量减少最多。

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    Fenfen Zhu; Masaki Takaoka; Kazuyuki Oshita; Shinsuke Morisawa;

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    School of Environment and Natural Resources, Renmin University of China, Beijing, People's Republic of China, Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing, People's Republic of China;

    Department of Environmental Engineering, Kyoto University, Kyoto, Japan;

    Department of Environmental Engineering, Kyoto University, Kyoto, Japan;

    Department of Environmental Engineering, Kyoto University, Kyoto, Japan;

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