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成果報告書詳細
管理番号20190000000108
タイトル*平成30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 CCS対応高効率システム開発 CO2回収型次世代IGCC技術開発
公開日2019/4/12
報告書年度2018 - 2018
委託先名一般財団法人電力中央研究所 三菱重工業株式会社 三菱日立パワーシステムズ株式会社
プロジェクト番号P10016
部署名環境部
和文要約
英文要約CCS is a way to reduce CO2 emission from thermal power stations. But as CO2 capture requires huge energy, introduction of conventional CO2 capture unit deteriorates thermal efficiency and its cost of electricity increases. This project is to develop the high-efficiency oxy-fuel IGCC system. This IGCC system is composed of O2/CO2 blown gasifier and semi-closed cycle gas turbine, this system is expected to keep high efficiency more than 42% at HHV after CO2 capture. MHI evaluated O2/CO2 gasification characteristics of Chinese coal by using 50TPD gasifier, to validate concept of O2/CO2 gasification. CRIEPI clarified the effect of CO2 partial pressure on gasification reaction using 3TPD gasifier in O2/CO2 gasification condition. As O2/CO2 gasifier is newly established concept, evaluation tool for coal brand applicability is planned to develop in this project. This evaluation tool consists of 2 numerical simulation codes. First code is to simulate gasification reaction inside gasifier, considering fluid dynamics, chemical reaction and particulate trajectories under pressurized furnace. To expand applicable coal brand, fundamental data on char gasification reaction of newly introduced coal brand was obtained using Pressurized Drop Tube, and temperature and gas composition profile was evaluated by numerical simulation. Another code is to simulate molten slag flow discharged from slag tap, the hole at the bottom of gasifier. Prediction model for physical properties necessary for slag flow simulation, namely viscosity, density and surface tension, were constructed. A part of syngas of both 50TPD gasifier and 3TPD gasifier were extracted to hot gas clean-up test unit, and its desulfurization performance was validated. MHI executed CFD analysis on gas turbine, considering combustion test data obtained last year in this project. CRIEPI executed single burner combustion test with exhaust gas recirculation to clarify effect of exhaust gas composition on combustion characteristics. MHPS surveyed system feasibility from the view point of impurity in captured CO2. CRIEPI updated data necessary for efficiency and cost evaluation, and CRIEPI considered the impact of gasifier operation condition on efficiency of Oxy-fuel IGCC system.
Since FY2015, CRIEPI had run another NEDO project to clarify effect of steam injection to entrained flow gasifier to enhance thermal efficiency of IGCC system much higher than state of the art IGCC. In 2017, mid-term evaluation of these 2 NEDO projects were executed and evaluation committee suggested to join them together. Thus, this project added new 2 research items, namely clarification of both steam injection to entrained flow IGCC and synergy effect of steam injection method to oxy-fuel IGCC system, and its schedule was prolonged to FY2020. The effect of steam injection on gasification efficiency improvement was evaluated by numerical simulation of commercial scale coal gasifier. This result was used for evaluation of plant efficiency improvement of IGCC system with steam injection.
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