Research on the development of a new metal removal method from biomass and application conditions

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K12406
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 64030:Environmental materials and recycle technology-related
• Research Institution: Kanagawa University
• Principal Investigator: Ito hiroyuki 神奈川大学, 工学部, 教授 (30372270)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: バイオマス / 灰除去 / 水洗浄 / 酸洗浄 / アルカリ洗浄 / 電場 / ブリケット / 燃焼時間

Outline of Final Research Achievements

Ground samples were impregnated and washed with water and aqueous solutions to remove ash. The effect of impregnation and washing methods on ash removal was investigated using bamboo and Japanese cypress. In addition, Japanese cypress was impregnated with hydrochloric acid aqueous solution, applied DC and AC electric fields, and clarified the effects of voltage and frequency on ash removal. Next, ground rice husk was impregnated with an alkaline aqueous solution, and the effect on ash removal and organic component loss was investigated. Finally, the ash-removed bamboo samples were made into briquette. The fact that the application of an electric field during acid washing promotes the removal of ash is a new finding. From the observation of the combustion duration of briquettes made from the ash-removed samples, a very significant result was obtained that while the ash removal had the effect of suppressing thermal decomposition, the char combustion was promoted.

Free Research Field

熱工学、燃焼工学

Academic Significance and Societal Importance of the Research Achievements

従来、バイオマス試料中の灰分を除去するため酸洗浄や水洗浄が行われていたが、含侵や洗浄方法の灰除去効果の比較は見られなかった。酸洗浄の際に電場を印加することで灰除去の促進効果が見られるという結果は全く新しい知見であり、灰除去の効率化に寄与するものである。灰除去した試料によって製造されたブリケットの燃焼継続時間を調べた結果から、灰除去が熱分解を抑制する効果が見られた一方で、炭の燃焼は促進されるという従来とは異なる知見が得られた意義は大きい。