O_2/CO_2气氛下水蒸气对煤粉燃烧砷释放特性的研究

Effect of steam on arsenic release in coal combustion at O_2/CO_2 atmosphere

为了研究水蒸气对O_2/CO_2气氛下煤粉燃烧砷释放的影响,利用自制的恒温燃烧实验台在800～1 300℃内进行煤燃烧实验。实验结果表明:在O_2/CO_2气氛下,发现水蒸气的存在会促进砷的释放,随着燃烧温度的升高,水蒸气的促进作用逐渐减弱;燃烧气氛中水蒸气体积分数从0增加到30%,砷的释放比例呈现非线性增加,水蒸气体积分数在0～10%之间促进作用明显,在10～30%之间促进作用减弱;在O_2/CO_2/H_2O气氛下,CO_2体积分数小于29%时,增加CO_2会促进砷的释放,而CO_2体积分数超过29%时,再增加CO_2会抑制砷的释放。

To study the effect of steam on arsenic release from coal combustion in the O2/CO2 atmosphere, the combustion experiments were conducted in the temperature range of 800-1300 ℃ using a customized isothermal combustion system. The experimental results show that the presence of steam can promote the release of arsenic, and the promotion effect of steam gradually weakens with the increase of combustion temperature in the O2/CO2 atmosphere. When the steam concentration increases from 0 to 30%, the release ratio of arsenic shows a nonlinear increase. The promoting effect of steam concentration between 0 and 10% is higher than that between 10 and 30%. Under the O2/CO2/H2O atmosphere, when the CO2 concentration is less than 29%, increasing CO2 will promote the release of arsenic; when it exceeds 29%, increasing CO2 will inhibit the release of arsenic.