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The effect of mineral compositions of waste and operating conditions on particle agglomeration/defluidization during incineration

机译：废物中矿物成分和操作条件对焚烧过程中颗粒团聚/脱液的影响

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摘要

Viscous components of waste tend to cause agglomeration during incineration. Previous studies have investigated the influence of various components of coal on tendency to agglomerate. However, the effect of single elements on agglomeration has rarely been examined. Accordingly, this investigation focuses on the effect of various different elements and operating parameters on agglomeration/defluidization during incineration. The nitrates of alkali (Na) and earth alkali metals (Mg, Ca) were added to artificial wastes, to simulate agglomeration. The effects of gas velocity, operating temperature, particle size and static bed height on agglomeration were also evaluated. Increasing the concentration of sodium reduced the time required to reach defluidization. However, the earth alkali metals (Mg, Ca) apparently inhibited agglomeration. The effect of the inhibition of the earth alkali metals reduced as the concentration of sodium was increased. When the concentration of sodium was 3.0 wt percent, the earth alkali metals promoted agglomeration. The concentration of sodium determined the behavior of agglomeration/defluidization during incineration. Increasing the operating temperature reduced the time required to reach defluidization, which increased with gas velocity. The particle sizes of Geldart B powder (545, 645, 770 mu m) used as bed materials had similar defluidization times. However, the use of D powder (920 mu m) accelerated agglomeration to reduce defluidization time.
机译：废物的粘性成分往往在焚化过程中引起团聚。以前的研究已经调查了煤的各种成分对聚结趋势的影响。但是，很少研究单一元素对团聚的影响。因此，本研究着重于焚烧过程中各种不同元素和操作参数对团聚/脱液的影响。将碱金属（Na）和碱土金属（Mg，Ca）的硝酸盐添加到人工废物中，以模拟团聚。还评估了气体速度，操作温度，粒度和静态床高对团聚的影响。钠浓度的增加减少了达到脱液所需的时间。但是，碱土金属（Mg，Ca）显然抑制了结块。随着钠浓度的增加，对碱土金属的抑制作用降低。当钠的浓度为3.0重量％时，碱土金属促进了附聚。钠的浓度决定了焚烧过程中的团聚/脱液行为。增加操作温度会减少达到脱液所需的时间，该时间随气体速度的增加而增加。用作床材料的Geldart B粉末（545、645、770微米）的粒径具有相似的脱液时间。但是，使用D粉（920微米）可加速团聚，以减少脱液时间。

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