A Novel Integrated Low Temperature Multi-Effect Distillation System with Spray Evaporation

doi:10.7652/xjtuxb201809022

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A Novel Integrated Low Temperature Multi-Effect Distillation System with Spray Evaporation

更新时间：2025-05-01

- A Novel Integrated Low Temperature Multi-Effect Distillation System with Spray Evaporation
- Vol. 52, Issue 9, Pages: 162-167(2018)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201809022
  CLC： TK124
- Online First：10 September 2018，
  
  Published：2018
- 稿件说明：
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A Novel Integrated Low Temperature Multi-Effect Distillation System with Spray Evaporation[J]. 2018, 52(9): 162-167.
DOI：

A Novel Integrated Low Temperature Multi-Effect Distillation System with Spray Evaporation[J]. 2018, 52(9): 162-167. DOI： 10.7652/xjtuxb201809022.

摘要

为了解决目前海水淡化过程中副产高浓度盐水的排放污染问题

设计了喷雾蒸发-低温多效蒸馏集成海水淡化系统。首先建立了进料流量为1 kg/s的五效顺流系统相应工艺流程的数学模型

并对其进行了热力和结垢分析

确定了抽汽比例为20%条件下集成系统的运行工况参数; 然后基于单个纯水液滴在干空气中的蒸发运动轨迹计算

完成了喷雾蒸发室的初步结构设计; 最终采用FLUENT软件对该喷雾蒸发过程进行了非稳态数值模拟

并对粒子停留时间以及蒸发效率进行了分析。结果表明:该套系统必须采用抽汽方式才能有效避免末效结垢情况的发生

喷雾蒸发室内的热质传递在35 s左右进入稳态

稳定时物料蒸发效率可以达到82.2%

基本达到了设计初衷。该系统可有效解决浓盐水的排放难题。

Abstract

To solve the problem of high-concentration brine pollution in the process of seawater desalination

a novel integrated low-temperature multi-effect distillation(LT-MED)system with spray evaporation is designed. A mathematical model for a five-effect parallel flow system with feed water of 1 kg/s is proposed. Based on the heat and scaling analysis

the system operation parameters are calculated under the condition with a steam extraction rate of 20%. In addition

a simplified non-equilibrium vaporization model is developed to describe the movement and evaporation behavior of a single water droplet in the dry air. A spray evaporation tank is designed based on the calculated results from the mathematical model. Finally

FLUENT is used to simulate the spray evaporation process

and the particle residence time and evaporation efficiency are analyzed. Simulation results indicate that this system should adopt steam extraction to avoid the occurrence of fouling in the last effect. The heat and mass transfer in the spray evaporation tank achieves a steady state after about 35 s and the evaporation efficiency is 82.2%

which can fulfill the original design intent. This system can effectively minimize the environmental impact resulting from the sea brine discharge.

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references

International Desalination Association(IDA). Desalination by the Numbers [EB/OL]. [2015-09-30].http:∥idadesal.org/desalination-101/desalinationbythe-numbers.

高从堦, 阮国岭. 海水淡化技术与工程 [M]. 北京: 化学工业出版社, 2016: 1-7.

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孙慧娟, 张海滨, 白博峰. 高温燃气中单个液滴的蒸发特性 [J]. 西安交通大学学报, 2008, 42(7): 833-837.

SUN Huijuan, ZHANG Haibin, BAI Bofeng. Evaporation investigation of single droplet in high temperature fuel gas [J]. Journal of Xi'an Jiaotong University, 2008, 42(7): 833-837.

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