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成果報告書詳細
管理番号20190000000128
タイトル*平成30年度中間年報 次世代火力発電等技術開発 次世代火力発電技術推進事業 石炭火力発電におけるバイオマス利用拡大技術の先導研究/微粉炭焚きボイラ伝熱管へ付着する多様なバイオマス灰の挙動解明と対策
公開日2019/4/10
報告書年度2018 - 2018
委託先名株式会社IHI
プロジェクト番号P16002
部署名環境部
和文要約
英文要約The purpose of this project is to find heat transfer inhibition and corrosion mechanism caused by adhesion of coal and biomass ash to boiler tube when co-firing biomass in pulverized coal fired boiler, and to find countermeasures to enable operation similar to coal firing. We selected Bituminous coal as coal, wood pellets and palm derived EFB pellets as biomass and try to achieve co-firing rate 50% (in calorific value) or more for wood pellets and 15% (in calorific value) or more for EFB pellets as a goal. First, we define the range of biomass fuel ash composition and co-firing rate that can be accepted without modification of boiler. Then, we consider countermeasures to achieve the goal of co-firing rate, and finally propose most economic them.
At the time of biomass co-firing, volatile substances such as alkali components are condensed on the surface of the boiler tube to form a base to which ash easily adheres compared to coal-firing, and ash adhesion is confirmed in a wide area by incorporating large particles. Inside the adhesion ash, bubbles are formed by volatile substances such as alkali components, which cause heat transfer inhibition by the deposited ash. As a result, since it is expected that heat absorption will decrease by the adhesion ash on the surface of the boiler tube, it is necessary to make countermeasures.
In this fiscal year, a test was conducted to be adhered combustion ash using wood pellet in the horizontal combustion test furnace. A probe controlled to a surface temperature comparable to that of the boiler tube was inserted into a temperature field equivalent to the boiler furnace environment.
In coal-firing, the heat absorption decreased with the growth of adhesion ash, and the adhesion ash dropped off naturally in 80 minutes and the heat absorption recovered. On the other hand, when the biomass co-firing rate is 75% or more, the adhesion ash did not fall off, and the heat absorption was decreasing throughout the test. It was found that the value obtained by integrating the heat absorption in 300 minutes decreases in the following order: coal-firing, biomass co-firing rate 75%, biomass co-firing rate 90%, biomass firing. Biomass co-firing rate 90% and biomass firing were almost the same.
In the next fiscal year, test conditions will be increased to find out the range of biomass fuel ash composition and co-firing rate that can be accepted without modification of boiler. We will consider countermeasures to achieve the goal of co-firing rate and finally propose most economic them.
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