脱腐植酸昭通褐煤残渣的热解特性

Pyrolysis Characteristics of Residue After Extracting Humic Acid from Zhaotong Lignite

对抽提完腐植酸的云南昭通褐煤残渣进行热解,通过热解气产率、焦油产率和半焦产率研究其热解特性,考察温度、升温速率和热解气氛对褐煤残渣热解的影响,并对每组热解实验得到的气体产物进行气相色谱分析,研究热解气的主要成分和含量,用气质联用仪对焦油进行成分分析.结果表明,温度是影响褐煤残渣热解的最重要因素,温度越高,热解气和焦油产率越大,热解气中H_2和CO越多,焦油中脂肪族物质增多,芳香族物质芳环数增大;升温速率越低,气体和焦油的产率越大;热解气氛对产物分布有着较大的影响,不同的热解气氛影响着热解气和焦油中主要组分的含量.

The pyrolysis of lignite residue after humic acid extraction in Zhaotong region of Yunnan Province was carried out, and the pyrolysis characteristics were analyzed through the pyrolytic gas yield, tar yield and semi-char yield. The effects of temperature, heating rate and pyrolysis atmosphere on residue pyrolysis were explored, the major components and content of pyrolysis gas were obtained by gas chromatography, and the composition of tar was revealed using gas chromatography-mass spectrometry. The results show that the temperature is the most important factor to affect residue pyrolysis, the higher of temperature, the greater yield of pyrolysis gas and tar, the more H2 and CO contained in pyrolysis gas, the more aliphatic compounds included in tar, and the number of aromatic ring in aromatic compounds will be increased accordingly; the lower of heating rate, the greater yield of gas and tar; pyrolysis atmosphere has prominent influence on product distribution, the content of major components of pyrolysis gas and tar is affected by different pyrolysis atmospheres.