成果報告書詳細
管理番号20120000001048
タイトル*平成23年度中間年報 最先端PG(Mega-ton Water System) 100万m3/日規模大型プラント構成最適化 最適運転制御システム研究開発
公開日2012/9/28
報告書年度2011 - 2011
委託先名株式会社日立製作所
プロジェクト番号P09025
部署名環境部
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) 本事業の目的
大型海水淡水化プラント運転時の課題である消費エネルギーの低減、すなわち運転コストの低減と処理水質の確保を、情報解析と先端シミュレーション技術を基盤とする情報および制御システムで実現することが本研究の目的である。
英文要約1. Objective of this project : Reduction of operational cost for a large scale seawater desalination plant using RO membrane in IWPP (Independent Water and Power Plant) with plant control system based on advanced simulation technology : 2. Contents and results of this project in this year : (1) Development of a power consumption model for high-pressure pump : In order to evaluate the power consumption and power cost, it is necessary to develop a power consumption model for high-pressure pump which consumes the power most and influences operational cost most among the facilities in the desalination plant. Therefore model equations were assembled to calculate power consumption of high-pressure pump based on the specifications of the pump. The power cost was calculated by multiplying the unit cost of the power to the power consumption predicted by the assembled model. When the temperature of the raw sea water gets high, the power consumption of the high-pressure pump decreases, because the permeability of the RO membrane increases. Model equations for the RO membrane were also developed considering the influence of the water temperature on permeability. (2) Development of rejection model for critical substances : When the temperature of the raw sea water gets high, the rejection rate of substances such as sodium chloride and boron decreases. Especially, the rejection rate of boron is rather low. Water-quality standard is 2.4mg-boron/L in guidelines for drinking water quality (WHO) and there is a possibility that the freshwater produced by the desalination process do not adequate for drinking purpose when the water temperature is too high. Therefore model equations were developed by which the boron rejection rate of the RO membrane can be calculated considering the influence of water temperature. (3) Development of prediction system for optimum operation : By assembling the model equations, a system by which the optimum operational condition can be calculated. Although some procedures should be done manually, it is possible to carry out many kinds of calculation easily using this system. (4) Case studies of heating effect : The objective of this study is to improve the performance of the desalination plant in IWPP by rising the raw sea water temperature by the waste steam. However, excessive heating of the raw sea water causes deficits such as decline of boron rejection rate and increase of steam purchasing cost. The optimum operational condition can be calculated from these trade-offs, and the optimum condition would be different by the unit cost of the steam and the temperature of the raw sea water. Therefore case studies for different conditions (steam unit cost, raw sea water temperature) were conducted and optimum operational conditions were evaluated.
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