成果報告書詳細
管理番号20110000000710
タイトル*平成22年度中間年報 革新的ゼロエミッション石炭ガス化発電プロジェクト 革新的ガス化技術に関する基盤研究事業 CO2回収型次世代IGCC技術開発(H20~23)
公開日2011/6/23
報告書年度2010 - 2010
委託先名財団法人電力中央研究所 国立大学法人九州大学
プロジェクト番号P08020
部署名環境部
和文要約和文要約等以下本編抜粋:1.共同研究の内容及び成果等 (1) 研究開発の背景と目的 地球温暖化対策としてCO2排出量削減が求められる中、CCS(CO2分離・回収・貯留)が注目されているが、現状のCO2回収技術は多量のエネルギーを要するため、発電プラントにおける送電端効率の低下が大きな課題となっている。 本事業は、テーマ設定型基盤研究として、石炭ガス化発電システムから回収したCO2をガス化剤の一部として用いることにより、送電端効率を大幅に向上可能な「CO2回収型次世代石炭ガス化発電システム」の実用基盤技術の開発を目標とし、CO2回収後において最新鋭微粉炭火力並の送電端効率42%の達成を目指すものである。
英文要約To cope with global warming problem, CCS is regarded as one of the counter measures in western countries, but introduction of CO2 capture system reduces thermal efficiency. Therefore it is required to develop innovative power generation technology with CO2 capture without huge efficiency loss. CRIEPI and Kyusyu University started joint development program of oxy-fuel IGCC system that can keep high plant efficiency of 42% even after capturing CO2. In H22 following results were obtained in this project. Coal gasification reaction model, which was originally proposed for complicated mixed gas composition by CRIEPI, was verified using pressurized drop tube furnace. 3TPD coal gasifier experiments clarified that increase of CO2 concentration promotes carbon conversion ratio and reduce char output. It was important target to prevent carbon deposition in low temperature area such as hot-gas clean-up system, but CRIEPI found out 3 methods to cope with carbon deposition problem in high CO concentration atmosphere. This year, CRIEPI compare the effect of these 3 methods from various viewpoints including necessary amount of gas and degradation effect on desulfurization system. Numerical simulation code developed in this project was applied to 1,680TPD coal gasifier and evaluated effect of CO2 and O2 concentration on temperature inside gasifier and gasification reaction. As feasibility study, construction cost this system is under consideration and it was clarified cost for desulfurization and CO2 capture unit is drastically reduced, but cost for air separation unit is higher than conventional pre-combustion system. System diagram and operation procedure is considered and several issues were clarified to be considered. Kyushu University engaged in the fundamental research of the O2/CO2 coal gasification and remarkable results are summarized as follows: The conversion characteristics of the products of rapid pyrolysis in the Drop Tube-Cylinder Two-stage Reactor (DT-TR) and the Drop Tube Reactor (DTR) and the effect of the gas composition on the conversion characteristics of the tar model aromatic compounds in the high temperature condition were investigated. To investigate the structure of the coal ash and the slag as the mixture of the various minerals, the thermal changes in the structure of the standard minerals such as kaolinite and quartz and the standard coal ash were analyzed by XRD, high temperature XRD and 800 MHz multinuclear solid state NMR in detail and their database was constructed. The correlation between temperature and viscosity characteristics measured by high temperature viscometer and the role of the solid particles in the slag were understood. The effect of the gas composition such as CO2 and H2O on the carbon deposition on the surface of the desulfurization agent and the performance of the desulfurization agent were investigated. The combustion characteristics of lean CO and CO-H2 under the high CO2 and H2O concentration condition assuming the coal gasification condition were numerically investigated. It was found that the combustion characteristics drastically changed due to the diluents. The optimized detailed chemical reaction mechanism for the combustion reaction of the coal gasification gas was obtained. The mathematical model including the slag viscosity with temperature dependency to describe the melt lag motion on the bottom of the gasifier was developed and its validation of the proposed model was confirmed by comparing with the experiment.
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