Recent progress in Japan on hot gas cleanup of hydrogen chloride, hydrogen sulfide and ammonia in coal-derived fuel gas
Recent progress in Japan on hot gas cleanup of hydrogen chloride, hydrogen sulfide and ammonia in coal-derived fuel gas
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DOI：
10.1016/j.powtec.2008.08.012
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发表时间：
2009-03
影响因子：
5.2
通讯作者：
Y. Ohtsuka;N. Tsubouchi;T. Kikuchi;H. Hashimoto
中科院分区：
文献类型：
--
作者：
Y. Ohtsuka;N. Tsubouchi;T. Kikuchi;H. Hashimoto
本文重点介绍了日本煤基联合循环发电技术中原料燃气中HCl、H2S和NH3的热气体净化技术的最新进展。结果表明，在400 °C下，由Na_2CO_3溶液和Al_2O_3溶胶混合制备的NaAlO_2可将空气气化气中的HCl从初始的200 ppm降低到<1 ppm，并且可耐受200 ppm的H_2S。关于H2S的去除，对ZnFe 2 O 4吸附剂在模拟燃料气体中的稳定性和耐久性的研究表明，从抑制金属Zn的蒸发和CO的碳形成的观点来看，存在最佳操作温度。高性能TiO 2负载的ZnFe 2 O 4，其可以在450 °C和1 MPa下将1000 ppm H2S降低至<1 ppm，已开发的均匀沉淀法使用的混合物的SiO2溶胶和Zn和Fe的硝酸盐的水溶液，然后与TiO 2混合。虽然这种吸附剂是可再生的和持久的，吸附能力应提高在富合成气燃料气从氧气吹气化炉。提出了一种用褐煤浸渍相应的硝酸盐溶液制备碳载ZnFe 2 O 4和CaFe 2 O 4的新方法，并在450 °C左右对4000 ppm H2S的脱除率接近100%。本文作者已经证明，富含α-FeOOH的澳大利亚褐铁矿作为催化剂材料用于在25体积%的富合成气中分解2000 ppm NH_3是实际可行的H2/50体积% CO在750 °C时，因为少量的H2O和CO2添加到气体中可以有效地抑制CO的碳沉积。
The present review paper highlights on the recent progress in Japan on the hot gas cleanup of HCl, H2S and NH3in raw fuel gas for coal-based, combined cycle power generation technologies. It has been shown that NaAlO2, prepared by mixing Na2CO3solution with Al2O3sol, can reduce HCl in an air-blown gasification gas from the initial 200 ppm to <1 ppm at 400 °C, and it is tolerable for 200 ppm H2S. With regard to the removal of H2S, studies on the stability and durability of ZnFe2O4sorbent in a simulated fuel gas have indicated the presence of an optimal operation temperature from the viewpoint of the suppression of both vaporization of metallic Zn and carbon formation from CO. High-performance TiO2-supported ZnFe2O4, which can decrease 1000 ppm H2S to <1 ppm at 450 °C and 1 MPa, has been developed by the homogeneous precipitation method using a mixture of SiO2sol and an aqueous solution of Zn and Fe nitrates, followed by mixing with TiO2. Although this sorbent is regenerable and durable, the sorption ability should be improved in a syngas-rich fuel gas from an O2-blown gasifier. A novel method to prepare carbon-supported ZnFe2O4and CaFe2O4by impregnating the corresponding nitrate solution with brown coal has been proposed, and the large desulfurization capacity of almost 100% has been achieved in the removal of 4000 ppm H2S around 450 °C. The present authors have demonstrated that an Australian limonite rich in α-FeOOH is practically feasible as the catalyst material for the decomposition of 2000 ppm NH3in a syngas-rich gas of 25 vol.% H2/50 vol.% CO at 750 °C, because small amounts of H2O and CO2added to the gas can work efficiently for inhibiting carbon deposition from the CO.