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›› 2007, Vol. 7 ›› Issue (5): 910-915.

• 反应与分离 • 上一篇    下一篇

高硫煤焦化过程气体返回耦合脱硫实验研究

付志新,郭占成,王申祥   

  1. 中国科学院过程工程研究所
  • 出版日期:2007-10-20 发布日期:2007-10-20

Desulfurization of High Sulfur Coal by Recycling Additional Gases during Coking Process

FU Zhi-xin,GUO Zhan-cheng,WANG Shen-xiang   

  1. Institute of Process Engineering, Chinese Academy of Science
  • Online:2007-10-20 Published:2007-10-20

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摘要： 通过模拟工业焦化过程，针对一种高硫煤考察了不同气体种类、气体流量及加热速率下，气体返回焦化过程对固体产物焦炭中硫含量变化及气相中H2S气体逸出行为的影响. 结果表明，焦化过程中通入H2, CH4和N2气体可以抑制热解气中的硫在逸出过程中返回到固体焦炭中，H2达到的焦炭脱硫量最大，其次是CH4和N2；气相中硫逸出行为表明，煤热解第一高峰阶段也是硫析出时的高峰阶段，800℃后均可达到总析出硫量的90%；增大气体流量、减小加热速率有利于使硫向气相转移，从而使固体焦炭中的硫分配降低；固体焦炭中硫含量变化亦表明，H2气氛下脱硫效果较佳，在空塔速度0.8, 1.3, 2.1 mm/s和3.0, 1.5℃/min两种加热速率下可使焦炭中硫含量分别降低0.36%~0.39%和0.46%~0.56%.

关键词: 高硫煤, 脱硫, 焦炭, 焦化过程

Abstract: The variation of sulfur content in coke and releasing behavior of H2S in pyrolysis gas were investigated by recycling additional gases during coking process. A high sulfur coal was used in this work to simulate the industrial coking process under different gas atmospheres, gas fluxes and heating rates. The results showed that it was effective to suppress the sulfur in gas returning into coke by recycling additional gases during coking process. Contrasted to the case without gas recycling, the initiation temperature of sulfur releasing was advanced when additional gases were recycled. Under different gas atmospheres, the cumulative sulfur removal of H2 was greater than those of CH4 and N2. The releasing behavior of H2S in pyrolysis gas indicated that the peak stage of sulfur releasing from coal was corresponding to the first peak of coal pyrolysis. In addition, the start releasing temperature of H2S was advanced due to additional gases being recycled. About 90% of the total sulfur removal could be reached when coking temperature was up to 800℃. The sulfur content in gas increased and the sulfur content in coke decreased with increasing gas flux and decreasing heating rate. The result from the sulfur content in coke also showed that the effect of desulfurization was more pronounced than other gases. Compared with the sulfur content in coke without gas recycling, the sulfur content was decreased by 0.36%~0.39% and 0.46%~0.56% at the space velocities of 0.8, 1.3, 2.1 mm/s with two different heating rates of 3.0℃/min and 1.5℃/min, respectively.

Key words: high sulfur coal, desulfurization, coke, oking process