氣化廠中除硫後之錳金屬硫化物在高溫氧化再生後下之特性分析

High Temperature Oxidation Behavior of Manganese Sulfidefrom Gasification Plants

柯子星(Tzu-Hsing Ko) ； 薛欣達(Hsin-Ta Hsueh)

《燃燒季刊》 74期 (2011/08) Pp. 36-44

https://doi.org/10.30041/CQ.201108.0004

摘要

煤炭氣化是由許多平行反應及連續反應將固態煤轉化為氣體產物，反應非常的複雜且無法完全被定義出。據目前的了解，煤炭氣化後之主要產物為H2、CO、CO2、CH4、N2、H2S以及少量的不純物，這些不純物則包括焦油、氮氧化物以及氯化氫等等。其中H2、CO、CH4便是氣渦輪機的主要燃料，硫化物以及其他不純物必須在進入氣渦輪機前去除，以保護氣渦輪機，同時亦可減少對環境的衝擊。煤炭中所含的硫份在氣化的過程中，大部分會轉化為硫化氫，當硫化氫進入氣渦輪機時會造成機具腐蝕，同時硫化氫也在會在氣渦輪機中被進一步氧化而生成硫氧化物。為了減少淨化過程中能量的損失，硫化氫淨化單元以高溫乾式技術為佳，其中以金屬氧化物在高溫下吸收硫化氫，為較受重視的除硫技術。高溫氧化再生程序是高溫乾式除硫技術中非常重要的一環，透過高溫氧化再生程序可使反應後之金屬硫化物再生為金屬氧化物，大幅節省金屬吸收劑的製備成本。本研究以自行製備之錳金屬氧化物為標的，探討除硫後之錳金屬硫化物在高溫氧化再生後下之特性分析，結果發現經過再生後再進行脫硫之吸收劑利用率明顯下降。由孔洞分析數據推論吸收劑再生後有燒結的情形。XPS圖譜進一步確認吸收劑中殘留之硫為硫酸根及亞硫酸根。最後在XRD圖譜中發現再生後之吸收劑只剩下γ-Al2O3特性波峰。

關鍵字

煤炭氣化複循環發電 ； 硫化氫 ； 高溫固態吸收 ； 高溫氧化再生 ； 硫酸根及亞硫酸根

並列摘要

The supply of petroleum and natural gas is getting significantly limited. Therefore, technologies that use the most abundant energy-coal to improve the efficiency of energy production are finding their niches. Integrated Gasification Combined Cycle (IGCC) is one of the advanced techniques to solve environmental and economic problems caused by using coal. Hot gas clean up of hydrogen sulfide (H2S) is a crucial issue in the development of the IGCC system. Nowadays, all commercial IGCC power plants utilize wet processes to clean up sulfur containing syngas. However, syngas, cooled by the wet processes would decrease the thermal efficiency of the system significantly. Thus, a high temperature cleaning of sulfur containing gases by dry techniques is hot for the researchers in this field. In addition, high temperature oxidation regeneration is a very important process in IGCC plants. Through a high temperature oxidation regeneration process, the cost for preparation of metal sorbents can be largely saved and thus, decrease the overall operation cost. The main objective of this study is focused on the high temperature oxidation regeneration behavior of manganese sulfide. The characterizations of sulfided Mn sorbent were analyzed by N2 adsorption, XPS and XRD. Results showed that the SO4(superscript 2-) and SO3(superscript 2-) were the main species after high temperature oxidation regeneration.

並列關鍵字

IGCC ； hydrogen sulfide ； dry techniques ； Mn sorbent ； SO4(superscript 2-) and SO3(superscript 2-)