成果報告書詳細
管理番号20120000000140
タイトル*平成23年度中間年報 環境調和型製鉄プロセス技術開発 (H20~H24)
公開日2012/6/9
報告書年度2011 - 2012
委託先名新日本製鐵株式会社 JFEスチール株式会社 住友金属工業株式会社 株式会社神戸製鋼所 日新製鋼株式会社 新日鉄エンジニアリング株式会社
プロジェクト番号P08021
部署名環境部
和文要約1.研究開発の内容及び成果等
(1) 鉄鉱石還元への水素活用技術の開発
1)水素活用/ガス循環最適プロセス技術開発(新日本製鐵株式會社)
水素を多量に含有する改質COG(組成はCO 30%、H2 60%)を高炉で利用した場合の、高炉内鉱石還元挙動(炉下部、炉上部)を明らかにするとともに、改質COG の最適な吹込プロセスの提言を行うための研究を行い、平成23 年度は以下の結果を得た。
[1]改質COG の適正吹込位置の最適化
シャフトへの改質COG 吹き込みを想定したときのガス種の違いによる拡散の状況を、2 次元ガス固体流れ実験装置と住金モデルを用いて解析し、ガス種による炉内への浸透の違いは顕著には見られないことを確認して一連の試験が終了。来年度は実験結果の実機スケールへの展開について、LKAB の試験高炉、および住金モデルを用いて検証する。
[2]羽口・レースウエイでの改質COG の反応挙動の解明
燃焼基礎試験装置を用いて、ブローパイプ内での水素の影響を調査した。水素を添加することにより水素が急激に燃焼し、微粉炭の燃焼性も向上することが分かった。今後、レースウエイ炉を用いて、レースウエイ奥でのソリューションロス反応の挙動把握等を実施する。
英文要約Iron ore reduction by hydrogen enriched gases in blast furnace
We have completed the production of experimental apparatus (SIS furnace) for a process evaluation of injecting from the shaft of the reformed-COG. We conducted a trial run and confirmed the basic functions.
We investigated the effect of hydrogen reduction at high temperatures. The hydrogen reduction compared to the reduction in CO is shrinkage of the ore layer is small and the smaller pressure loss.
By use of the mathematical blast furnace model for gas injection through shaft, the effects of injected reformed-COG distribution in furnace on the carbon consumption rate were estimated qualitatively.

Development of hydrogen amplification process technology using catalytic reforming of hydrocarbons in crude COG
The bench-scale test plant has been constructed safely. One of essential mechanical technology, exclusive catalyst reactor, was successfully developed in order to eliminate deposited carbon.

Coke production technology development for hydrogen use iron ore reduction
High strength coke, DI(15, 150) value as high as 90, was obtained by HPC addition. It was elucidated that HPC improved coal dilatation to fill the void space between the coal particles during the coking process.

Development of CO2 capture technologies
The 30 ton/day chemical absorption evaluating plant realized the energy consumption of 2.5 GJ/t-CO2 which was top-leading value in the world, and showed such a small rising of the energy consumption as the extent of 2% in 3000-hours-running operation. Novel chemical absorbents were developed. They consist of amines, which exhibit enhanced CO2 absorption rate and capacity without increasing heat of reaction. Development of physical adsorption technologies is also in progress, the bench plant shows twice CO2 recovery capacity compared with designed one.

Development of technologies for utilizing exhaust heat
Studies have been conducted on various promising waste heat recovery technologies. Organic/inorganic chemical heat pump system and heat storage / heat transfer system utilizing phase change material (PCM) were selected as development objects.
The roll-forming of steelmaking slag was carried out by bench plant. It was succeed in making a plate-like slag. An experimental facility to recover sensible heat of slag has been constructed in JFE Chiba Works.
For the cost reduction of Kalina cycle system, the test equipment of the heat transfer enhancing element in Kashima is started to design.

A holistic model has been established to evaluate the energy balance of an entire steel works. The Experimental Blast Furnace research is planned.



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