Research and Application of Zero Discharge Technology for Desulfurization Wastewater of 660MW Coal-fired Unit

The desulfurization wastewater is a kind of intractable wastewater which comes from the process of wet desulfurization. There are many shortcomings of traditional development methods. Desulfurization wastewater evaporation treatment in flue gas duct as a new processing technology. This approach of evaporating desulfurization wastewater by flue gas is feasible. The feasibility of the demonstration project of boiler flue gas treating wastewater on 4# boiler in Changshu Power Company limited was analyzed; the computational fluid dynamics (CFD) software FLUENT was adopted to simulated the pressure field and velocity field in the outlet flue pipes of air pre-heater. The concrete arrangement mode and the number of the spray lances were determined by calculations. The temperature of the flue gas is tested after the system was put into operation. The results showed that this technology can realize the desulfurization wastewater with zero discharge without hurting the work of electrostatic precipitator. The demonstration project is the first of its kind in domestic power industry; this study provides experiences and references of power plant desulfurization wastewater with zero discharge.

Download Full-text

Performance Evaluation and Optimization Analysis of Zero Discharge Device for Desulfurization Wastewater Based on Spray Drying Technology

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/592/1/012199 ◽

2019 ◽

Vol 592 ◽

pp. 012199

Author(s):

Renlei Wang ◽

Yu Dai ◽

Shanshan Zhang ◽

Yonglong Lan

Keyword(s):

Performance Evaluation ◽

Spray Drying ◽

Optimization Analysis ◽

Discharge Device ◽

Zero Discharge ◽

Drying Technology ◽

Desulfurization Wastewater

Download Full-text

Promoting the removal of fine particles and zero discharge of desulfurization wastewater by spray-turbulent agglomeration

Fuel ◽

10.1016/j.fuel.2020.117461 ◽

2020 ◽

Vol 270 ◽

pp. 117461 ◽

Cited By ~ 1

Author(s):

Zongkang Sun ◽

Linjun Yang ◽

Shuai Chen ◽

Lu Bai ◽

Xin Wu

Keyword(s):

Fine Particles ◽

Zero Discharge ◽

Desulfurization Wastewater

Download Full-text

Application and Product Standard of Purified Crystalline Salt from Desulfurization Wastewater of Thermal Power Plant

E3S Web of Conferences ◽

10.1051/e3sconf/201913606019 ◽

2019 ◽

Vol 136 ◽

pp. 06019

Author(s):

Zhengkun Li ◽

Ruozheng Li ◽

Xiaoyu Liu ◽

Chong Zhao ◽

Ying Tian

Keyword(s):

Waste Water ◽

Sodium Sulfate ◽

Power Plants ◽

Thermal Power ◽

Resource Recovery ◽

Separation And Purification ◽

Crystalline Salt ◽

Zero Discharge ◽

Product Standard ◽

Desulfurization Wastewater

：The shortage of water resources and the increasingly strict requirements of environmental protection make the zero discharge of waste water from thermal power plants imperative. The treatment of high salt desulfurization wastewater is the bottleneck of the application and promotion of "zero discharge" technology. The waste water zero discharge and resource recovery technologies such as salt separation and purification can be used to make sodium chloride crystal salt meeting the standards of "industrial salt" (GB/T 5462-2015) and sodium sulfate crystal salt meeting the standards of "industrial anhydrous sodium sulfate" (GB/T 6009-2014). However, due to the lack of related standards of certification index and certification method of crystal salt products, it is restricted to realize resource recovery as commodities. In this paper, the application field and product standard of purified crystalline salt from desulfurization wastewater are analyzed.

Download Full-text

Practice of Zero Discharge Project for Desulfurization Wastewater of 1000MW Coal-fired Unit

E3S Web of Conferences ◽

10.1051/e3sconf/201911804024 ◽

2019 ◽

Vol 118 ◽

pp. 04024

Author(s):

Renlei Wang ◽

Jiang Yu ◽

Bowen Guo ◽

Yonglong Lan

Keyword(s):

Water Treatment ◽

Technological Process ◽

Direct Cost ◽

High Purity ◽

Economic Benefits ◽

Technical Parameters ◽

Zero Discharge ◽

Operation Cost ◽

Desulfurization Wastewater ◽

Membrane Concentration

The technological process, technical parameters, operation cost and effect of zero discharge project for desulphurization wastewater of 1000MW coal-fired unit in East China are analyzed. The project mainly adopts the process of softening pretreatment, membrane concentration and evaporation crystallization, the direct cost of per ton water treatment is about ￥35.3, and the final product is high purity industrial salt. This technology fully realize the zero discharge requirement of desulphurization wastewater, and has good envir(can )tal and economic benefits.

Download Full-text