无烟煤燃料氮的热解析出规律
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摘要: 采用固定床反应器，在氩气氛围下，对我国四种不同产地的无烟煤从400 ℃到1 200 ℃进行热解试验，研究了燃料氮中Tar-N,HCN,NH3,Char-N的析出规律，以及燃料氮中N的分布特性。研究结果发现HCN-N的析出量随热解温度的升高而增加，NH3-N的析出量在1 000 ℃左右达到最大值而后略有降低，Char-N的含量呈现反趋势下降。1 000 ℃以上，NH3-N的析出量及HCN-N+NH3-N的析出量随挥发分增加而降低。Tar-N的含量在整个温度范围内都比较少，基本不随温度而变化。Abstract: Using a fixed-bed pyrolysis reactor, the formation of Tar-N, HCN, NH3 and Char-N out of four kinds of blind coal from different producing areas,as well as the characteristics of released N on the fuel nitrogen,were studied between 400 ℃～1 200 ℃ under an Ar atmosphere. It was shown that HCN yield increased with increasing temperature from 400 ℃ to 1 200 ℃, while the yield of NH3 increased to its maximum at 1 000 ℃, followed by a slight decreasing. In contrast, Char-N yield decreased with increasing temperature. At≥1 000 ℃, the yield of NH3-N and NH3-N +HCN-N decreased as the volatiles of parent coal increased. Tar-N yield was little and almost had no change in all temperature range for all coals.
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Key words:
- nitrogen /
- HCN /
- NH3 /
- blind coal
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