セメント製造プロセスのＣＯ２分離を考慮した天然ガスハイドレート利用システムのエネルギー収支に関する評価
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概要
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Recently Japanese government's energy policy calls for an expanded use of natural gas in order to reduce the emission of greenhouse gases. Especially, natural gas hydrates, which are solid materials that resemble ice, are expected to become one of new type natural gas resources, and several applications such as natural gas storage and cold thermal energy storage have been applied in various industrial applications. Typical, cement industry consumes a huge amount of heat and energy, and much of carbon dioxide (CO<SUB>2</SUB>) emission occurs not only from fossil fuel combustion but also from the calcinations of limestone, which is the main material. Therefore the authors have put forward a scheme which makes possible the CO<SUB>2</SUB> separation and energy saving by using hydrate technology for cement manufacturing process, and then evaluated the validity of the scheme by calculating the energy balance. Consequently, by cooling the introductory air of a cement grinding process by hydrate cold energy, the grinding efficiency has improved about 1% and 0.4kWh/t-cl reduction of the power consumption was achieved. By cold-water use to condenser of a tower waste heat boiler, the power generation output increased from 21.9kWht/t-cl with 22.5 kWt/t-cl, and boiler efficiency has been improved by 1.6%. By proposing CO<SUB>2</SUB> separating by the hybrid system with using the chemistry absorbing method together, the energy 234kWh/t-cl and 53% of a simple hydrate system. CO<SUB>2</SUB> was reduced from 782kg/t-cl to 492kg/t-cl. In addition, the proposed system was validated based on these trial calculation results.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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