成果報告書詳細
管理番号20120000000820
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 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
公開日2012/7/26
報告書年度2011 - 2011
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 本研究では溶液輸送による熱輸送技術(溶液輸送型吸収冷凍機.Solution Transportation
Absorption chiller,略してSTA)を実証するとともに,それを用いて石油精製プロセスか
らの低温排熱を有効利用して製油所の省エネルギーを実現する手法を開発することを目的と
している.
 本技術はアンモニア・水系吸収冷凍サイクルに基づく冷凍機であり,アンモニア冷媒,ア
ンモニア水溶液を輸送することによって長距離の冷熱輸送を実現する.投入された排熱の熱
エネルギーは冷媒と溶液の濃度差に変換される.そのため,溶液を輸送する配管には断熱の
必要がなく,変換された熱エネルギーは常温で長距離輸送されても散逸しないことが大きな
特徴である.
 溶液輸送をしない通常のアンモニア吸収冷凍機と同様に,STAの駆動熱源温度は100?
200℃の範囲である.本研究では石油精製工場で発生する100?130℃程度の未利用排熱に
注目する.低温排熱はこれまで必ずしも十分活用されていないことから,STAによる有効利
用の可能性を検討する.
英文要約Title: Development of design methodology on the heat transportation technology based on solution concentration difference to utilize wasted heat from oil refinery processes
Year: 2011 (Total research period: 2011-2013)
Research members: Tokyo University of Agriculture and Technology
JX Nippon Oil and Energy Corporation

Research abstract
The objectives of this study are experimental investigation of heat transportation technology with solution transportation and its design for the application to oil refinery processes to achieve energy conservation. The mechanism of heat transportation is based on ammonia-water absorption cycle which refrigerant and solutions are transported over long distance to transfer cooling. This technology is named “Solution Transportation Absorption chiller”, STA in short. In this system, thermal energy is converted into concentration difference of refrigerant/solutions. Therefore, the pipelines need no insulation and thermal energy is held inside even at ambient temperature for any length of transportation.
Because STA is a variation of ammonia absorption cycle, the temperature of driving heat source is expected the range of 100-200 degC. This study focuses on wasted heat from oil refinery processes which temperature is 100-130 degC. Currently such low temperature wasted heat has not yet been utilized enough.

1. Application of STA to oil distillation process
1.1 Modeling STA for cycle simulations
It is effective to examine the system performance by cycle simulations in advance. Here, the plant analysis tool named “Aspen Hysys” was employed for the modeling ammonia-water absorption cycle. The statice cycle simulations with the driving temperature of 100-130 degC calculated cooling production and COP (Coefficient Of Performance). It indicated it would be possible for STA to produce chilled water for cooling distillation process.

1.2 Estimation of energy conservation on oil distillation process
Chilled water from STA is planned to be used for cooling the top of atmospheric distillation towers, which is expected to decrease the process temperature and reduce heat input to the process. To estimate the effects, the database of wasted heat in the oil refinery plant of JX Ohita has been updated with the survey of cooling heat exchangers as the wasted heat sources. The applicability of STA for utilizing such wasted heat in JX Ohita was examined and possible energy conservation was estimated by simulation concerning the distillation process. The analysis discussed a procedure to design energy saving processes with STA associated with the plant data and the STA performance.

2. Experimental verification of STA
The project plans to build a test plant of STA with the cooling capacity of 25 RT which will be set up in the university. The tender had been conducted to select a manufacture to construct the STA plant which started the design. The plant will have short pipelines for the solution transportation instead of long ones. But the pipe volume and pressure drop are adjusted to have the same function as the long pipelines. Measuring equipments and infrastructures such as power, gas fuel, water supplies were prepared for the plant.
Furthermore, JX Ohita reviewed a sample of the operation manual of ammonia absorption chillers from the viewpoint of an STA user.
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