摘要
为了研究石灰石煅烧/碳酸化循环法捕集CO2过程中H2S对吸收剂性能的影响,利用固定床反应器进行了煅烧石灰石吸收H2S的试验,研究了H2S流量、体积分数和反应温度3个因素与穿透时间和CaO转化率之间的关系,确定了600℃是石灰石煅烧/碳酸化法实现硫碳共脱的理想反应温度。在600℃时,考察了CaO同时脱除CO2和H2S的多次循环反应特性,结果表明:CaO对H2S有良好的脱除效果,而吸收CO2的能力则随循环次数增加不断下降。研究了煅烧气氛(氮气或空气)对CaO循环反应特性的影响,对比试验结果发现:H2S的存在使得空气煅烧条件下20次循环反应后CaO吸收CO2转化率比氮气煅烧时的转化率下降了41.3%。研究分析表明:空气煅烧时,CaS会与O2反应生成CaSO4,堵塞颗粒内部孔隙,使得CaO循环转化率迅速下降。
Abstract： The effect of H2S on CO2 sorption in calcination/ carbonation cycles was studied using sulfidation experiments with the calcined Limestone in a fibbed reactor. The H2S flow rate, the concentration and the reaction temperature were related to the prebreakthrough period and CaO conversion with 600 ℃ found to be a suitable choice for co capture of H2S and CO2. The CaO effectively removes the H2S in the presence of CO2 during looping cycles, but the sorption capability of CO2 decreases with increasing numbers of cycles. Cycle tests in a calcination atmosphere with N2 and air show that the carbonation conversion after 20 cycles calcined in air is 41.3% lower than in N2 in the presence of H2S. When calcined in air, CaS reacts with O2. The CaSO4 so formed blocks the pores inthe samples which significantly reduces the cyclic conversion of CaO.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期342-347,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金项目(51061130535)
