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Formation of HCN and NH_3 during coal macerals pyrolysis and gasification with CO_2

机译：CO 2热分解和气化过程中HCN和NH_3的形成

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Three coal macerals with high purities were separated from Pingshuo gas coal. The formation rules of HCN and NH_3 during macerals pyrolysis and gasification were investigated. Experiments were carried out in a tubular quartz reactor at atmospheric pressure. The reactor allowed coal particles to be heated up rapidly and held for a prespecified period of time at a peak temperature. The amount of HCN and NH_3 were quantified by ion chromatography. The influence of temperature and macerals type on the formation rules of HCN and NH_3 was discussed. Results showed that the formation of HCN was mainly due to the thermal cracking of volatile, and NH_3 formed both from the thermal cracking of volatile and the cracking of nascent char. The HCN yield increased with an increase in pyrolysis temperature. For three coal macerals (liptinite, vitrinite and inertinite), the yield of HCN depended not only on their volatile contents but also nitrogen-containing functional groups, in which more pyrrole-type nitrogens would form more amount of HCN at lower temperature. The yield of NH_3 depended on the ability of forming 'H' radical. Under the experiment condition in this study, inertinite could convert more nitrogen into NH_3 than vitrinite and liptinite. The yield of HCN during gasification was almost the same as that during pyrolysis, the yield of NH_3 during gasification was little higher than that during pyrolysis.
机译：从平朔煤气中分离出三种高纯度的煤。研究了在热解和气化过程中HCN和NH_3的形成规律。实验是在大气压下在管状石英反应器中进行的。该反应器使煤颗粒迅速加热并在峰值温度下保持预定的时间。通过离子色谱法定量HCN和NH_3的量。讨论了温度和基石类型对HCN和NH_3形成规律的影响。结果表明，HCN的形成主要是由于挥发物的热裂解，而NH_3既是由于挥发物的热裂解而又是新生炭的裂解。 HCN产量随热解温度的升高而增加。对于三种煤化学成分（锂锰矿，镜质石和惰质），HCN的产率不仅取决于其挥发物含量，还取决于含氮官能团，其中更多的吡咯型氮会在较低温度下形成更多的HCN。 NH_3的产率取决于形成“ H”自由基的能力。在本研究的实验条件下，与镜质体和脂质体相比，惰质体能将更多的氮转化为NH_3。气化过程中HCN的产率与热解过程中的几乎相同，气化过程中NH_3的产率略高于热解过程中的NH_3。

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