成果報告書詳細
管理番号20120000000832
タイトル*平成23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2012/8/2
報告書年度2011 - 2011
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
1) ラボスケール蒸気生成器を用いた1槽式の実験装置を製作し,蒸気生成および吸着材再生工程のサイクル実験を行った.実験には約0.26 kg の13X ゼオライトを用いた.大気圧下で80 º C の温水を導入し, 5-6 サイクルで連続運転した. 再生工程の時間を1200s, 3600s の2 種類で検討した結果,いずれの再生時間でも最大200℃の加熱蒸気を生成できることを実証した.生成蒸気量は,熱収支から得られる理論蒸気量の8割以上であった.再生工程の時間が短いほど1 サイクルあたりの生成蒸気量は減少するが,単位時間あたりの生成蒸気量は増加することが示唆された.ラボ試験のデータを基に,ベンチスケール装置設計を支援した.
2) 操作条件がそれぞれの工程へ及ぼす影響を検討するため,数値解析モデルを作成した.
蒸気生成工程では,装置内部の温度分布および生成蒸気量を妥当に推算することができた.解析により,水導入温度よりも,生成器内初期温度を高くする方が生成蒸気量の増加に有効であることが示唆された.再生工程では,解析モデルで反応器内温度,空気出口温度の経時変化をほぼ予測することができた.
3) 蒸気を効率良く発生させるため,水導入部を分岐させてできる限り均一に温水を導入するように工夫した.その結果,多少の偏流の影響はあるものの,内部温度差が小さくなり,蒸気量が増加した.
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-FY2012) FY2011 Annual Report

(1) Development of steam generation system
A lab scale steam generator was developed. The cycle experiment which consisted of steam generation and regeneration of adsorbent was carried out. As a result, mass of steam generated was more than 80 % of theoretical value based on the heat balance. The data to design bench scale apparatus was obtained from the data. Numerical models for steam generation and regeneration were developed to study the effect of operating conditions on the process. Calculated results agreed with the experimental ones.
Based on the basic experiment, three lab scale generators for 0.3 kg zeolite/unit, 1 MPa and 250 degC were manufactured. The system of the bench scale steam generator was designed. Related instruments for measurement were decided and ordered.
(2) Development of air regeneration system
LiBr/water absorption heat pump was theoretically investigated. As a result, the temperature of heat transfer fluid was more than 130 degC at the initial LiBr concentration of more than 62 %. The performance of heat pump with the slurry of microcrystalized LiBr increased by more than 100 %. Absorption rate measured by a lab scale heat pump increased with LiBr concentration. The adsorption heat for microcrystalized LiBr particularly increased.
The air regeneration system was tested with three different heat transfer tubes. Concentrated LiBr resulted in higher temperature (125 degC) due to absorption of water vapor. To form liquid film on the outside of tube, flow rate and inlet size of the absorbent were essential. The horizontal level at the edge of tube was also important to form liquid film on the inside of tube. Apparatus was arranged to study the regeneration of absorbent.
The corrosion of metal by LiBr was examined under more than 130 degC and presence of air. SUS316L exhibited higher tolerance than others. Several corrosion inhibitors were also tested.
(3) Development of process system technology
Gas flow in the generator was numerically studied to improve the efficiency. It was found that flow drifted especially near the wall. It was also found that the header at the upper and lower parts of the generator would be helpful to prevent the drift.
According to the basic studies, it was found that the sequential operation with more than four generators would be reasonable to generate steam continuously.
Dry air with dew point of -40 degC by desiccant was selected for the bench scale experiment. Air dryer to generate dry air with dew point of -40 degC and preheater to heat dry air up to 70 degC were designed and made. Regeneration of desiccant in the bench scale setup was designed to utilize waste heat from the steam generator. The precooler was introduced to increase in the relative humidity at the rotor inlet. Flow diagram of bench scale experiment was designed. The specifications of the devices were arranged.
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