石膏废料掺入对废轮胎CO辅助气化过程中合成气生成的影响。
Effect of gypsum waste inclusion on syngas production during CO-assisted gasification of waste tires.
作者信息
Mavukwana Athi-Enkosi, Burra Kiran G, Sempuga Celestin, Castaldi Marco, Gupta Ashwani K
机构信息
The Combustion Laboratory, University of Maryland, Department of Mechanical Engineering, College Park, MD, USA; Department of Civil and Chemical Engineering, College of Science, Engineering, and Technology, University of South Africa (UNISA), c/o Christiaan de Wet & Pioneer Avenue, Florida Campus 1710, Johannesburg, South Africa.
The Combustion Laboratory, University of Maryland, Department of Mechanical Engineering, College Park, MD, USA.
出版信息
Waste Manag. 2023 Sep 26;171:375-381. doi: 10.1016/j.wasman.2023.09.022.
Syngas production from co-gasification of waste tires and different amounts of drywall waste gypsum (CaSO) was investigated using CO as the gasifying agent in a lab-scale reactor. Gypsum is known to react with carbon feedstocks through solid-solid reactions to produce CaS and CaO, CO, and CO. The presence of gypsum in waste tires increased the syngas yield from the conversion of char and tars. Gypsum addition to the waste tire also increased syngas quality from increased syngas energy yield. The overall yield of syngas increased by up to 55% while the energy yield (MJ/ kg feedstock) improved by 40% with gypsum addition. The product gas yield, energy, H, and CH yields increased with gypsum addition while CO only increased for lower gypsum concentrations. Higher gypsum addition increased CO yields. Aspen Plus simulation results revealed that for waste tires, temperatures < 1200 °C suppressed the transformation of sulfur present in gypsum into SO for all waste tires to gypsum feed mass ratios. At 50 wt% gypsum concentrations, only 2% of the sulfur in the feedstock was transferred into SO. The results showed improved syngas yield and quality, without any increase in sulfur emissions showing the benefits of gypsum waste incorporation in waste tire gasification.
在实验室规模的反应器中，以CO作为气化剂，研究了废轮胎与不同量的干墙废石膏（CaSO）共气化生产合成气的过程。已知石膏通过固-固反应与碳原料反应生成CaS、CaO、CO和CO。废轮胎中石膏的存在提高了焦炭和焦油转化产生的合成气产率。向废轮胎中添加石膏还因合成气能量产率的提高而提升了合成气质量。添加石膏后，合成气的总产率提高了55%，而能量产率（MJ/千克原料）提高了40%。添加石膏后，产物气产率、能量、H和CH产率均增加，而CO仅在较低石膏浓度下增加。较高的石膏添加量提高了CO产率。Aspen Plus模拟结果表明，对于废轮胎，在所有废轮胎与石膏进料质量比下，温度<1200°C会抑制石膏中存在的硫转化为SO。在50 wt%的石膏浓度下，原料中只有2%的硫转化为SO。结果表明，合成气产率和质量得到了提高，且硫排放量没有增加，这表明将石膏废料纳入废轮胎气化过程具有益处。
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