A novel technical route based on wet flue gas desulfurization process for flue gas dehumidification, water and heat recovery

被引：38
|
作者：
Chen, Zhen [1 ]
You, Changfu [1 ,2 ]
Wang, Haiming [1 ]
Xie, Ning [1 ]
机构：
[1] Tsinghua Univ, Dept Energy & Power Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Shanxi Res Inst Clean Energy, Taiyuan 030032, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2020年 / 171卷
关键词：
Dehumidification; Calcium chloride; Gas-liquid flow pattern; Mass transfer; Water and heat recovery; MASS-TRANSFER; LIQUID; CONDENSATION; ABSORPTION; AEROSOL; FLOW; COEFFICIENTS; INDUSTRIAL; PARTICLES; POLLUTION;
D O I：
10.1016/j.applthermaleng.2020.115102
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
To recover the water and heat in industrial flue gas before discharging, a novel dehumidification system was proposed by combining the liquid-desiccant-based dehumidification (LDD) method with the existing wet flue gas desulfurization (WFGD) process in a single spraying tower. Calcium chloride (CaCl2) solution was used as a liquid desiccant. A flow pattern controlling (FPC) device was designed to further enhance the mass transfer in the dehumidification process. The effects of liquid-to-gas ratio (L/G), desiccant solution temperature (T-de), desiccant concentration (omega), and superficial flue gas velocity (v(g)) on the dehumidification performance were investigated. The water and heat recovery process of the LDD-WFGD system were analyzed theoretically in detail. Furthermore, the application potential of the proposed LDD-WFGD system for water and heat recovery for coal-fired power plants was discussed by conducing case studies. The recovered water from flue gas could supply 47.2% and 44.8% of the water demand for the WFGD systems in 660 MW and 330 MW power plants, respectively.
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页数：11
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