成果報告書詳細
管理番号20130000000160
タイトル*平成24年度中間年報 省エネルギー革新技術開発事業 先導研究 未利用温排熱から高温水蒸気を生成する吸着式蒸気回生システムの研究開発
公開日2013/5/2
報告書年度2012 - 2012
委託先名国立大学法人九州大学 国立大学法人岐阜大学 森松工業株式会社 公立大学法人岡山県立大学 高砂熱学工業株式会社 株式会社ThyssenKrupp Otto
プロジェクト番号P09015
部署名省エネルギー部
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) 蒸気生成器の基礎研究
ベンチスケール装置で平均140℃以上の蒸気を連続的に生成させることを目標に蒸気生成器の基礎研究を行い,具体的には以下の成果を得た.
英文要約Title: Research and Development Program for Innovative Energy Efficiency Technology. Research and Development of Adsorption Steam Recovery System for Generating High Temperature Steam from Unused Hot Waste Heat (FY2011-FY2013) FY2012 Annual Report
(1) Development of steam generation system
Superheated steam at 0.4MPa was generated in the lab-scale experiment using water at 80degC. From heat and mass balances during steam generation, the theoretical mass of steam was estimated. This was considered as the target of this study.
Desorption rate was measured by thermal analysis and its parameters were determined. Then a numerical model for the regeneration of zeolite was developed. Based on the calculated distributions of temperature and water content, the mass of steam generated after regeneration process was calculated. The appropriate regeneration time, which would give the maximum mass of steam in the cycle operation, was estimated.
The bench scale apparatus with three units was developed. The temperature of generated steam ranged between 125 and 155degC (140degC on the average), which was the target of this year.
(2) Development of air regeneration system
LiBr/H2O absorption heat pump was examined by a lab-scale setup. Water vapor absorption rate into LiBr fine crystal particle slurry improved 2.4 times of saturated solution without slurry. The particle size of the slurry was stable during dissolution/crystallization. Corrosion rate by LiBr for a copper tube used in bench scale system was less than 0.2% in 1000 hours under evacuated atmosphere at 130 degC. Contamination of LiBr into pure water resulted in lower performance. It was correlated by a function of electric conductivity and temperature of water.
Bench scale air regeneration system was developed. Air (more than 120degC, 1050 Nm3/h) was produced from water at 80degC. The distance between the upper end of the heat transfer tube and the inlet of steam in the absorber affected heating of the air. The decrease in temperature of cooling water in the condenser resulted in high LiBr concentration and high heating rate of air.
(3) Development of process system technology
Gas flow in the generator was numerically studied to reduce pressure drop during regeneration process. As a result, the packing structure which could reduce pressure drop by more than 20% but increase volume of packed bed was suggested. Apparatus to observe water flow in the steam generator was developed.
Bench scale apparatus including utility equipment such as a chiller was developed. A desiccant rotor was used to produce dry air. Part of the outlet gas from the steam generator was used for regeneration of the desiccant rotor. The effect of the flow rate of the outlet gas on the dew point of the air for the regeneration was studied.
Effect of operating conditions on the steam was studied. Total energy balance of the system could be calculated. It would be helpful to discuss the total efficiency of the system.
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