铁钙混合氧化物脱硫剂的硫化与再生过程研究

煤炭是世界上最丰富的化石燃料，有效提高煤炭利用效率和控制环境污染是目前面临的重要研究课题。先进的整体煤气联合循环发电（IGCC）和燃料电池（MCFC）技术被认为是煤炭利用的最佳途径。高温脱除燃料 气中的H2S是其中的关键技术，高温脱硫目前存在的问题是脱硫剂使用过程的粉化。本文研制出铁钙混合氧化物脱硫剂，采用固定床反应器，考察了不同配比铁混合氧化物的硫化及再生性能。结果表明，当Fe2O3与CaO等摩尔比时，脱硫剂有良好的硫化和再生性能。用H2O（g) O2进行再生时，先后有H2S和SO2逸出，并伴有单质硫形成。该脱硫剂连续硫化－再生循环稳定，且硫容逐渐增加，脱硫效率和机械强度亦逐步提高。

A Study of High Temperature Desulfurization and Regeneration Using Iron-Calcium Oxides in a Fixed-Bed Reactor

Coal is the most abundant fossil energy in the world. We are facing with an important task about how to increase coal utilization efficiency and in the mean time to control environmental pollution. Advanced integrated gasification combined cycle (IGCC) and molten carbonate fuel cell (MCFC) are emerging as viable methods for more efficient and cleaner power generation. Development of technologies for efficient removal of H2S from coal derived fuel gas is now recognized as to be crucial to the economics of coal utilization in the IGCC and MCFC processes. The problem of high temperature coal gas desulfurization technology is the powdering of desulfurizer which considerably prevents industrial application. In this paper, iron-calcium complex oxides desulfurizer were studied and developed, and desulfurization and regeneration behaviors with various Fe2O3/CaO mole ratio were investigated in a fixed-bed reactor. The results showed that multiple sulfidation-regeneration cycles behavior can be better performed with mole ratio of Fe2O3/CaO=1. Sulfided sorbents can be completly regenerated with H2O and O2. H2S releasing is prior to SO2, pure sulfur was simultaneously formed. Desulfurization performance and mechanical strength maintained steady, and more over sulfur capacity gradually increased after three sulfidation and regeneration cycles.