Advanced MED-TVC Design

摘要：

Reducing water production costs in thermal seawater desalination systems is a primary R&D goal. For Multi-Effect Distillation (MED) systems, assuming fuel cost range of 50＄/barrel, preliminary estimates show that a 50％ increase in the Gain Output Ratio (GOR) can result a 30％ saving in steam costs and a 20％ saving in the total water production costs. As a rule of thumb, the higher the fuel cost, the higher savings will be. Since GOR is directly related to the temperature range of thermal desalination systems, the main objective of this research, in order to reduce water cost, is to rise up Top Brine Temperature (TBT) to approximately 100℃. Increasing TBT will have several advantages, e.g. more distillate production rate in the existing cell, enhancing the performance of next cells, reducing heat transfer area by enhancing heat transfer rate. Thus, a better .understanding of scale formation mechanisms, development of novel anti-sealant and implementing enhanced heat transfer coefficient to calculate heat transfer area can have significant impact on the process performance and water cost reduction. For these purposes, a dedicated pilot test unit was designed and constructed by Doosan Heavy Industries & Construction Co. Ltd. (Doosan) in Changwon South Korea, in collaboration with BASF. Pilot testing efforts were focused on evaluating the performance of antisealant, and scale measurement by using different techniques such as atomic absorption spectroscopy “AAS, scanning electron microscopy “SEM, energy dispersive X-ray spectroscopy “EDXS and X-ray diffraction “XRD as well as deriving new empirical evaporation heat transfer coefficient for high TBT condition. A test program under various temperatures, feed flow rate and antisealant dosing rates was implemented in stages, the final results were used in developing a Scale Index and Empirical Evaporation Heat Transfer coefficient. These data led to conceptual design of 20 MIGD high-temperature MEDTVC.

关键词： MED-TVC TBT heat transfer coefficient scale formation anti-scalant calcium carbonate magnesium hydroxide

作者: Fatemeh Rezazadeh SeungWon Ihm Karim Bourouni HyunSung Choi Mohammed Yousuf JongKyou Park

作者单位: Water R&D Center, Doosan Heavy Industries & Construction, Dubai, UAE,Fatemeh

会议类型: 国际会议

会议名称: 2010 Asia-Pacific Conference on Desalination and Water Reclamation(2010 亚太脱盐大会)

会议地点: 青岛

会议语种:英文

页码: 232-239

在线出版日期: 2010-06-22（万方平台首次上网日期，不代表论文的发表时间）