高硫煤加氢热解脱硫研究

在常压固定床上,温度450—750℃,氢气流速300—900 mL/m in和升温速度15℃/m in的实验条件下,对沟底高硫煤加氢热解脱硫的影响因素进行了研究。实验结果表明,适当增加氢气的流速,提高反应最终温度和延长停留时间,对高硫煤加氢热解脱硫效率的提高和降低残留物中的硫质量分数都是有利的;利用气相色谱研究了硫化氢气体的逸出规律,随着热解温度的提高,硫化氢气体逸出曲线表现为2个峰。研究认为,高温峰源于硫铁矿和噻吩类含硫化合物中硫的脱除,而低温峰源于脂肪族含硫化合物硫的脱除。煤脱硫反应的热力学也表明,随热解温度升高煤加氢热解脱硫分为2段。

Study on desulphurization of high sulfur coal in hydropyrolysis

Hydropyrolysis of Goudi high-sulfur coal was studied under 0.1 MPa and at 450-750 ℃,with hydrogen flow rate of 300-900 mL/min and the heating rate of 15 ℃/min in a fixed reactor.The desulphurization rate was obtained from elemental analysis of residual char.The volatile sulfide(mainly H_2S) was detected by a gas chromatograph with a FPD detector.The hydrogen can promote the reactions of desulphurization and can decrease the sulfur in the char.The releasing curves of H_2S obviously showed two peaks.The low temperature peak was from the desulphurization of aliphatic sulfide and the high temperature peak could be from both the sulfur in pyrite and aromatic thiophthene structure.The thermodynamics parameters also show that the desulphurization process in HYPY of high sulfur coal can be regarded as in two stages according to the evolution profiles of H_2S.