成果報告書詳細
管理番号20130000000161
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 製油所廃熱有効活用を図る溶液濃度差熱輸送技術の設計方法論確立の研究開発(H23-H25)
公開日2013/5/11
報告書年度2012 - 2012
委託先名国立大学法人東京農工大学 JX日鉱日石エネルギー株式会社
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
平成24 年度は溶液輸送方式による熱輸送( STA) の技術的実証のための実験装置の設置,シミュレーションによる製油所蒸留塔の塔頂冷却による性能改善の予測,近隣工場との連携による排熱有効利用方策について検討した.
英文要約Title: Study on energy conservation measures of thermal energy transportation with solution concentration difference in order to utilize wasted heat from oil refinery factories (FY2011-FY2013) FY2012 Annual Report
Tokyo University of Agriculture and Technology
JX Nippon Oil and Energy Corporation
1. Objective
The objective of this study is to investigate the application of STA (Solution Transportation Absorption chiller) to utilize low temperature heat sources of oil refinery factories. The performance of oil refinery processes decreases in summer season due to inadequate cooling capability of the oil distillation columns. If STA, which is driven by wasted heat of the factories, supplies cooling to them, it can achieve both energy conservation by increasing the process performance and utilization of wasted heat simultaneously.
2. Research Results
2.1 Application of STA to oil distillation processes
(1) Dynamic simulation of STA
The dynamic behavior with the pipeline length of 1 km was simulated in the case with step-like decrease of cooling load. The simulation predicted that the liquid levels of the absorber and the condenser would change more intensively than that of normal absorption chiller. The results suggest that relatively larger reservoirs are required for the absorber and the condenser of STA.
(2) Improvement of oil refinery performance by STA
Three oil distillation processes were selected to examine the improvement of the process performance when STA cooling is supplied to decrease the pressure. It was expected to improve the production of Naphtha by 29% compared with the conventional process operation even though thermal input was constant. The decrease of the pressure also allows the shift to different crude oil blend which is rich in light components. In that case, the Naphtha production could be increased up to 61%. When the index of thermal energy consumption for a unit Naphtha production is discussed, STA cooling supply can increase the index by 22% to 38% respectively.
(3) Total energy efficiency and the improvement of the oil refinery processes
The total energy efficiency was evaluated to be 64% for current factory while ideal maximum energy efficiency would be 81%. The analysis was conducted to detect the sources of energy losses and found effective measures to improve the efficiency by 4.6%.
2.2 Technological feasibility of STA system
An STA experimental facility was constructed in Koganei Campus of TUAT in 2012. It has three solution transportation pipes which have the same volume as 200 m pipelines. Although the actual length is about 10 m, it equivalently emulates the long transportation by controlling pressure drop.
Preliminary tests suggested that the STA had the cooling capacity of 90 kW as designed and the COP of approximately 0.6.
2.3 Further application of STA
If wasted heat can be transferred to factories located around oil refinery factories, it will enhance the effect of wasted heat utilization. When the cooling water is replaced with brine or -8 degC produced by STA, the power generation efficiency of Propane Rankin cycle is estimated to improve by 62%.
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