成果報告書詳細
管理番号20120000000139
タイトル*平成23年度中間年報 ゼロエミッション石炭火力技術開発プロジェクト革新的CO2回収型石炭ガス化技術開発物理吸収法におけるサワーシフト反応最適化研究(H23~H25)
公開日2012/6/9
報告書年度2011 - 2011
委託先名株式会社日立製作所
プロジェクト番号P10016
部署名環境部
和文要約1. 共同研究の内容及び成果等
(1) 研究内容
石炭火力発電からのCO2 削減を目的として、平成22 年度から「革新的CO2 回収型石炭ガス化技術開発」において、高効率かつ高炭素回収率を実現するためのCO2 分離回収技術の開発を実施している。CO2 分離回収技術としては、「物理吸収法」を取り上げ、酸素吹噴流床ガス化炉(EAGLE炉)を用いてガス化設備および発電システムへの適用性の確認や技術確立を行うこととしている。CO2 物理吸収法はサワーシフト反応工程とCO2 分離回収工程から構成されている。
英文要約“Development of Innovative Coal Gasification Technology with CO2 Capture” is aiming at reduction CO2 emission of coal power generation. We are developing especially a high efficiency CO2 capture system which is appropriate to next generation IGCC from 2010. “Physical absorption system” is selected as a CO2 capture technology to coal gasification and power generation system. Feasibility demonstration and technology development is conducted by the oxygen blown entrained coal gasifier (EAGLE).CO in syngas from coal gasification has to be converted into CO2 by water gas shift reaction process. This process uses steam and this steam usage is one of the reason for decreasing the efficiency of power generation with CO2 capture.
Thus steam usage should be minimized however reduction of steam usage causes sub reaction, typically Fischer-Tropsh reaction, which produces carbon. The carbon deposit on the catalyst might deteriorate performance of the catalyst.
The aim of this study is to obtain a minimize steam quantity without performance deterioration of the sour shift catalyst. Experiments were planed to acquire a relationship between operation conditions such as steam quantity, reaction temperature and a performance of the catalyst such as CO conversion ratio and carbon deposition.
This year, reaction temperature, reaction pressure and residence time were selected as operation conditions.
The results of the experiments are as below.
CO conversion ration decreases according to the H2O/CO ration reduction under all temperature conditions. At H2O/CO = 0, shift reaction does not proceed within the theory of equilibrium, however CO conversion reaches 4% at 500C. This indicates that CO is consumed by some sub reactions.
We conducted an analysis of the gas from the reactor. The gas contains C1-C8 hydrocarbons, alcohol and organic acid, and the sum of these materials is increased as the temperature and H2O/CO ratio are increased. The amount of these materials by sub reactions reaches the highest value 1120ppm at 500C and H2O/CO = 0. We also measured the quantity of carbon deposition. The quantity of carbon deposition is increased as the temperature and H2O/CO are decreased. The tendency of carbon deposition is different from the tendency of hydrocarbons formation. It indicates that the carbon deposition is not the result of hydrocarbons formation. Bowdword reaction is one of the reactions that accompany carbon deposition under high CO concentration. Following the equilibrium theory, the quantity of Bowdword reaction arises as the temperature becomes lower. Thus we consider that the mechanism of carbon deposition in this study can be associated with Bowdword reaction.
In 2012, we will continue to analyze the mechanism of the sub reactions in order to optimize the operation conditions. After that we will evaluate the performance of the catalyst under optimal operation conditions by the model gas and the gas of the pilot plant.
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