Experimental study on alkali emission during rice straw pyrolysis
Experimental study on alkali emission during rice straw pyrolysis
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发表时间：
2005
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通讯作者：
Yung-Yun Chun
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作者：
Yung-Yun Chun
针对高碱生物质热化学利用过程中的碱问题，对稻草热解过程中K、Na、Cl的释放进行了定量研究。在小型固定床热解反应器中，以化学分馏和后续测量为基础，研究了稻草热解全过程中不同形态碱和Cl的转化和排放特征。结果表明，稻草中碱在673 K以下热解过程中迅速释放，随后进入高温缓慢释放阶段。K、Na和Cl在热解过程中的释放行为相似，而Cl在523 K以下的低温热解阶段表现出更强的挥发性。稻草中90%以上的碱是水溶性的，这部分碱是碱热解释放的关键。不同形态的钾在热解过程中发生相互转化，但钠的释放方式比较简单，除水溶性钠外，大多数形式的钠都表现出较低的活性。
To deal with the alkali problems of high-alkali biomass thermochemical utilization, the quantitative study of the release of K, Na and Cl from rice straw pyrolysis was carried out. On the basis of chemical fractionation and subsequent measurements, the transformation and emission characteristics of different forms of alkali and Cl during the whole process of rice straw pyrolysis were examined in a small-scale fixed bed pyrolysis reactor. The results show that the alkali in rice straw is released rapidly during pyrolysis under 673 K, then evolves into a high temperature slow releasing stage. K, Na and Cl have similar releasing behaviors during pyrolysis while Cl shows more volatility in low temperature pyrolysis stage under 523 K. More than 90% of alkali in rice straw is water-soluble, and this part of alkali is crucial to the alkali pyro lytic release. Different forms of K undergo reciprocal conversion during pyrolysis, but the pattern of Na releasing is simple, and most forms of Na show relatively low activity except water-soluble Na.