炼焦过程中硫元素迁移规律研究

以华北地区的峰峰低硫肥煤和山西中硫焦煤为原料,利用1 kg热解试验装置进行模拟炼焦试验,并对所得焦炭、煤焦油和煤气产品中硫元素形态和质量进行测定,揭示了炼焦煤中硫元素的迁移规律。结果表明:两种炼焦煤挥发分差别不大,硫元素迁移规律基本相同;炼焦过程中,不但原料煤中硫酸盐硫得以保留,还有其它形态硫经过复杂的热解化合反应生成新的硫酸盐硫;无机硫中的黄铁矿硫和有机硫中的脂肪硫、硫醚、硫醇等在炼焦过程中以H2S形式转移到煤气中,转移效率一般低于50%;原料煤中黄铁矿硫含量越高,H2S的转移率也越高;其他噻吩硫等在炼焦过程中不分解,留在焦炭中。

Sulfur migration law during coking process

Taking Fengfeng low-sulfur fat coal in North China and medium-sulfur coking coal in Shanxi Province as experimental coal samples, simulate the coking test with 1 kg pyrolysis experimental apparatus. Determine the forms and mass of sulfur in coke, coal tar and coal gas, investigate the sulfur migration law during coking process. The results show that, there is little difference between the volatile matter and sulfur migration law of the experimental coal samples. During the coking process, the original sulphate sulfur in coal don＇t change and other forms of sulfur transfer into new sulphate sulfur through complicated pyrolysis combination reaction. Pyritic sulfur, steato-sulfur, thioether and mercaptan transfer into coal gas in the form of H2S, the transfer efficiency is usually less than 50 percent. The more pyritic sulfur in coal sample, the higher H2S transfer efficiency. The thiophene sulfur don＇t decompose during coking.