煤热解中半焦发热量及硫迁移规律的研究

Study on calorific value and sulfur migration of semi-coke during coal pyrolysis

以含硫量中等的烟煤作为实验煤样,对其进行热解,研究热解脱硫效果、半焦发热量以及挥发分的变化规律。采用高温炉对煤样进行热解,设置不同热解时间、不同的热解温度对煤样进行热解,研究热解时间和热解温度对煤热解脱硝率和半焦挥发分以及发热量的影响。研究结果表面:(1)热解具有脱硫的效果,同时脱硫效果受到热解温度和热解时间的影响;(2)16min热解脱硫效率到达29.91%,脱硫效果良好,半焦的发热量为22.99KJ/g;(3)在450℃-650℃温度段内,脱硫效率变化不大,此时焦炭具有固硫效果;(4)随着温度的升高半焦的傅里叶红外图谱中C-S、S-O的官能团减少使得热解过程脱硫。

Taking bituminous coal with medium sulfur content as experimental coal sample,the effect of desulfurization,calorific value and volatile matter were studied.Pyrolysis of coal samples was conducted in a high temperature furnace with different pyrolysis time and different temperature.The effects of pyrolysis conditions on desulfurization efficiency,semicoke volatilization and calorific value were investigated.The results showed that:(1)Pyrolysis had the effect of desulfurization,which was affected by pyrolysis temperature and pyrolysis time;(2)The desulfurization efficiency of coal pyrolysis reached 29.91%in 16 min,the desulfurization efficiency was good,and the calorific value of semicoke was 22.99KJ/g;(3)In the temperature range of 450℃to 650℃,the desulfurization efficiency had little change,at this time,semicoke had the effect of sulfur fixation;(4)The maximum specific surface area of semicoke was the reduction of C-S and S-O functional groups in the FTIR spectrum during pyrolysis.