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Development of High Performance Desulfurization Sorbent in the Coal Combustion and Gasification

煤炭燃烧及气化用高性能脱硫吸附剂的研制

基本信息

批准号：
11218212
负责人：
SUZUKI Toshimitsu
金额：
$ 24.58万
依托单位：
KANSAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

项目摘要

In order to mitigate carbon dioxide emission in the utilization of coal, increase in the thermal efficiency is indispensable. For this purpose, Integrated Coal Gasification Combined Cycle (IGCC) has been proposed. Further increase in the thermal efficiency of IGCC, high temperature gas cleaning is indispensable. This project is aimed at development of efficient absorbent of H_2S in the coal gasification gas from an entrained bed coal gasifier. Ferrites were reported to be a good absorbent of H_2S at an elevated temperature. However, a ferrite produced by dry method exhibited very low surface area and only the surface of the ferrite was utilized as an absorbent. To overcome this, we have developed a new process preparing ferrite at a low temperature in a wet method using an activated carbon as ferrite carrier. The zinc ferrite produced in the presence of an activated carbon exhibited a high surface area. H_2S absorption behavior of this sorbent exhibited excellent performance, where alm … More ost all of Fe and Zn in the ferrite was sulfided at 400 to 600℃. Moreover, effluent gas after absorption by using a fixed bed flow reactor, contained very low H_2S concentration of less than 1 ppm. Such high performance has never been observed with zinc ferrite prepared other methods. Ferrites prepared in the presence of low sulfur coal exhibited similar behavior as that prepared in the presence of activated carbon. Cost of the absorbent with coal would be reduced considerably as compared to the ferrite prepared with activated carbon. Calcium ferrite prepared in the presence of coal also exhibited excellent performance for the absorption of H_2S. Detailed studies on the performance of ferrites were done in order to understand performance of the ferrites. Characteristic feature of the ferrite was elucidated.In addition to H_2S absorbent, SO_2 absorbent in coal combustion was developed with CaO and oyster shell. Oyster shell treated with Yallourn coal at 850℃. Improved SO_2 absorption capacity compared to raw oyster shell was achieved. Less

为了减少煤炭利用过程中的二氧化碳排放，提高热效率是必不可少的。为此，提出了整体煤气化联合循环（IGCC）。为了进一步提高IGCC的热效率，高温烟气净化是必不可少的。本课题旨在开发气流床气化炉煤气中H_2S的高效吸收剂。铁氧体在高温下是一种很好的H_2S吸收剂。然而，通过干法生产的铁氧体表现出非常低的表面积，并且仅铁氧体的表面被用作吸收剂。为了克服这一缺点，我们开发了一种以活性炭为铁氧体载体的低温湿法制备铁氧体的新工艺。在活性炭存在下生产的铁酸锌表现出高表面积。该吸附剂对H_2S的吸收性能优良，且在一定的条件下， ...更多信息在400 ~ 600℃时，铁素体中的Fe和Zn全部硫化。经固定床流动反应器吸收后的废气中H_2S含量很低，小于1 ppm。如此高的性能是用其他方法制备的铁酸锌从未观察到的。在低硫煤存在下制备的铁氧体表现出与在活性炭存在下制备的铁氧体类似的行为。与用活性炭制备的铁氧体相比，用煤制备的吸收剂的成本将大大降低。以煤为原料制备的铁酸钙对H_2S的吸收性能也很好。为了了解铁氧体的性能，对铁氧体的性能进行了详细的研究。在此基础上，以CaO和牡蛎壳为原料，研制了燃煤脱硫剂。850℃下用雅伦煤处理牡蛎壳。与生牡蛎壳相比，牡蛎壳对SO_2的吸收能力有所提高。少