成果報告書詳細
管理番号20110000001527
タイトル*平成22年度中間年報 省エネルギー革新技術開発事業 先導研究 革新的電子線源を用いた省エネルギーNOx無害化技術の研究開発
公開日2011/10/12
報告書年度2010 - 2010
委託先名JFEエンジニアリング株式会社
プロジェクト番号P09015
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 (1) 大面積アレイ型CNT電子線照射プロセスの開発 NOxを75%以上の高い脱硝率で高効率に処理するために、電子線を排ガス中に全体に一様かつ連続して照射するためのカーボンナノチューブ(以下CNT)電子線発生装置を試作した。CNTカソードを用いた大面積アレイ型電子銃の電子放出部は外径150mm(表面積177cm2)であり、出力電流としては最大30mA(実機想定出力の1/100レベル)を見込み設計されている。まず、大面積アレイ型CNT電子銃の最適構造を決定し、次に電圧ばらつき±10%以内のCNTカソードを量産化し、最後にそのカソードを組み込んだアレイ型電子銃を試作し一様な電子放出性能を確認した。
英文要約Title: Projects of Research and Development of Innovative Energy Saving Technology. Research and Development of the technology for energy saving nitrogen oxides (NOx) removal using an innovative electron beam source (FY2010-FY2011) FY2010 Annual Report: Objective of the project is to develop a new NOx removal technology applicable to low-speed diesel engine for large vessels. The International Maritime Organization (IMO) has decided that after 2016 ships sailing in the designated sea area have to reduce NOx emission by about 80% from the current limit level. The trade-off relationship between NOx emission and fuel consumption results in increasing the fuel consumption and carbon dioxide emission with reducing the NOx emission by controlling the diesel engine combustion. On the other hand, the ammonia selective
catalytic reduction (SCR) system practiced for the NOx removal from the exhaust gas is difficult to apply to the current diesel engine under high concentration of sulfur oxides (SOx) and the low exhaust gas temperature due to rapid deterioration of the catalyst activity. To solve these problems, the following two R&D items are currently under development aiming at the establishment of the innovative energy-saving NOx removal technology using carbon-nanotube (CNT) electron emitters. (1) Development of large area electron beam irradiation process using the CNT array emitters: To achieve NOx removal efficiency of higher than 75%, an apparatus for continuous and uniform electron beam irradiation in the exhaust gas is being developed. CNT array emitters for a large electron beam source with a size of roughly 100 cm2 was developed. A basic structure of the electron beam irradiation apparatus and the CNT array electron emitter was evaluated and a prototype of a CNT array electron beam source with the current of 30 mA (around 1/100 of the power in an actual system under plan) was fabricated. Electron emission characteristics of the prototype of the CNT array electron gun were investigated. (2) Development of high efficiency NOx removal process incorporating
reducing reaction using sulfites: Properties of various sulfite-based reductants were investigated and three optimum reductants were selected among them. Small-scale laboratory experiments were performed to estimate the reaction involving various radicals formed by electron beam irradiation in simulated exhaust gas in the presence of the selected reductant. Various methods for spraying reductants and geometry of various reactors were also investigated and a prototype of a small reactor for the reduction was fabricated.
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