煤加水成生H_2S气体模拟研究

Simulation Experiments of Generation of H_2S in Coal with Water

为了研究煤含水条件下H2S生成规律,采用自主设计的高温高压封闭体系反应装置,在真空高温含水条件下对新疆西山煤矿煤进行热化学还原反应,模拟煤成生H2S气体能力。热模拟实验在250~550℃真空含水条件下进行,每隔50℃取一个点,并采用Agilent 7890B系列气相色谱仪对气相产物进行分析。实验结果表明：在250~300℃阶段,煤生成H2S气体量较少;在300~550℃阶段,煤生成H2S气体量急剧攀升,在450℃达到最大值0.118 9%。在250~550℃阶段内,H2S气体中的硫主要来源于脂肪族有机硫的分解,少量来源于芳香族硫分解和黄铁矿硫。总体来说,在250~550℃温度范围内,煤中H2S气体的生成量主要受控于煤中有机硫分解释放的硫自由基量,也就是说,硫自由基量越高,H2S的生成量就越大,反之,H2S的生成量就越小。

In order to study the generation law of H2S under the condition of coal and water, using the high temperature and high pres- sure reaction device in our own design, containing a closed system, under the conditions of high temperature, high vacuum and water, we conduct simulation experiments on the thermal chemical reduction reaction system of coals from Xishan Coal Mine in coal mining area of Xinjiang. The thermal simulation experiments are conducted under the conditions of high temperature and at 250 - 550 ℃ , then take a point every 50 ℃ and analyze gas products by the gas chromatograph of Agilent Technologies 7890B Series. The results show ： At the temperature of 250 to 300 ℃, the content of H2S gas is less generated. At the temperature of 300 to 550 ℃, the content of HES gas rises sharply and at 450 ℃ , reaches the maximum, which is O. 1189%. At the stage of 250 to 550℃ , the elemental sulfur in H2S gas is mainly from aliphatic sulfur decomposition, a little from aromatic sulfur decomposition and pyrite sulfur. In general, the content of HE S gas in coal is mainly controlled by the amount of sulphur free radicals produced by the organic sulfur in coal at the stage of 250 to 550 ℃. That is to say, the higher the amount of sulfur free radicals, the higher the generated content of HES, on the contrary, the lower the generated content of HES.