Effect of Operational Parameters of Wet Flue Gas Desulfurization on Water Consumption

2013 ◽  
Vol 726-731 ◽  
pp. 2026-2029
Author(s):  
Ying Ying Xiong ◽  
Yuan Yi Liu ◽  
Hou Zhang Tan
Keyword(s):  
Water Consumption ◽  
Flue Gas ◽  
Consumption Rate ◽  
Experimental System ◽  
Pilot Scale ◽  
Flue Gas Desulfurization ◽  
Calculation Formula ◽  
Operational Parameters ◽  
System Operation ◽  
Important Significance

A pilot-scale WFGD experimental system has been built and employed to investigate experimentally operating parameters upon the water consumption of Wet Flue Gas Desulfurization (WFGD). The water consumption calculation formula of Calcium desulphurization system and water consumption rate curve on power plant WFGD system are obtained, according to the variation of coal can calculate the water consumption of the current conditions of FGD system, all this work has important significance upon FGD system operation on the current the variation of coal condition.

A Model for Calculating the Outlet Flue Gas Temperature of FGD Absorption Tower

2011 ◽  
Vol 130-134 ◽  
pp. 3812-3816
Author(s):  
Gang Xu ◽  
Yao Tian ◽  
Xing Yuan ◽  
Yong Ping Yang
Keyword(s):  
Theoretical Model ◽  
Energy Balance ◽  
Water Consumption ◽  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Gas Temperature ◽  
Significance Analysis

Theoretical model for calculating the outlet flue gas temperature of limestone-gypsum wet flue gas desulfurization (FGD) absorption tower is important for water consumption calculation. In this paper, the energy balance in the spray zone is analyzed and a model for calculating the outlet flue gas temperature of FGD absorption tower is proposed. An example computation of the outlet flue gas temperature of a typical 600MW class unit’s operation data is introduced, the result has verified the model. A further study of significance analysis has then been made to analyze and simplify the model.

Performance of pilot-scale constructed wetland treatment systems for flue gas desulfurization waters

2008 ◽  
Vol 15 (3) ◽  
pp. 115-129 ◽  
Author(s):  
Derek A. Eggert ◽  
John H. Rodgers ◽  
George M. Huddleston ◽  
Carl E. Hensman
Keyword(s):  
Constructed Wetland ◽  
Flue Gas ◽  
Pilot Scale ◽  
Flue Gas Desulfurization ◽  
Wetland Treatment

Pilot-scale demonstration of the hybrid zero-valent iron process for treating flue-gas-desulfurization wastewater: Part I

2013 ◽  
Vol 67 (1) ◽  
pp. 16-23 ◽  
Author(s):  
Yong H. Huang ◽  
Phani K. Peddi ◽  
Hui Zeng ◽  
Ci-Lai Tang ◽  
Xinjun Teng
Keyword(s):  
Flue Gas ◽  
High Performance ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Low Cost ◽  
Pilot Scale ◽  
Zero Valent Iron ◽  
Flue Gas Desulfurization ◽  
Stage System ◽  
Water Problems

The hybrid zero-valent-iron (hZVI) process is a novel chemical treatment process that has shown great potential in previous laboratory and field bench-top scale tests for removing selenium, mercury and nutrients from various industrial wastewaters. In this study, a pilot-scale demonstration was conducted to continuously treat 3.8–7.6 L/min (1–2 gpm) of the flue-gas-desulfurization (FGD) wastewater at a coal-fired power plant for five months. Results show that the hZVI process could simultaneously reduce selenate-Se from 1 to 3 mg/L to below 10 μg/L and mercury from over 100 μg/L to below 10 ng/L in compliance with the new stringent effluent discharge limits planned by the U.S. EPA for Se and Hg. A three-stage hZVI system with a combined hydraulic retention time of 12 h is sufficient for Se treatment, while a single-stage system can meet Hg treatment requirement. The successful pilot study demonstrated that the hZVI process is scalable and could be a reliable, low-cost, high-performance treatment platform with many application potentials, particularly, for solving some of the toughest heavy metal water problems.

Pilot-scale demonstration of the hybrid zero-valent iron process for treating flue-gas-desulfurization wastewater: Part II

2013 ◽  
Vol 67 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Yong H. Huang ◽  
Phani K. Peddi ◽  
Hui Zeng ◽  
Ci-Lai Tang ◽  
Xinjun Teng
Keyword(s):  
Heavy Metals ◽  
Flue Gas ◽  
High Performance ◽  
Treatment Process ◽  
Low Cost ◽  
Pilot Scale ◽  
Zero Valent Iron ◽  
Flue Gas Desulfurization ◽  
Waste Production ◽  
Water Problems

The hybrid zero-valent-iron (hZVI) process is a novel chemical treatment process that has shown promise for removing heavy metals and nutrients from industrial wastewaters. In this study, a pilot-scale demonstration was conducted to continuously treat 3.8–7.6 L/min (1–2 gpm) of the flue-gas-desulfurization (FGD) wastewater at a coal-fired power plant for 5 months. In this paper, a spike test was conducted to evaluate performance of the hZVI process for removing selected toxic metals at artificially elevated concentrations. The results showed that a multiple-stage hZVI process could decrease selenate-Se from 22 mg/L to ∼10 μg/L and dissolved Hg2+ from 1.15 mg/L to ∼10 ng/L. In addition, the process simultaneously removed a broad spectrum of heavy metals such as As(III), As(V), Cr(VI), Cd(II), Pb(II) and Cu(II) from mg/L to near or sub-ppb (μg/L) level after a single-stage treatment. The process consumed about 0.3 kg ZVI per 1 m3 FGD wastewater treated at a cost of about US$0.6/m3. Solid waste production and energy consumption were reasonably low. The successful pilot study demonstrated that the hZVI technology can be a low-cost, high-performance treatment platform for solving some of the toughest heavy metal water problems.

Economic Analysis of Wet Flue Gas Desulfurization System with the Application of Low Pressure Economizer for Waste Heat Recovery

2015 ◽  
Vol 1092-1093 ◽  
pp. 491-497 ◽  
Author(s):  
Jing Hui Song ◽  
Yan Lin ◽  
Yan Fen Liao ◽  
Xiao Qian Ma ◽  
Shu Mei Wu
Keyword(s):  
Economic Analysis ◽  
Power Consumption ◽  
Water Consumption ◽  
Flue Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Power Plants ◽  
Waste Heat ◽  
Low Pressure ◽  
Flue Gas Desulfurization

The data of wet flue gas desulfurization (WFGD) power and water consumption, from two different coal-fired power plants (100 MW and 1000 MW) under full load operation, are studied for the WFGD economic analysis of waste-heat-recovery transformation with the installation of low pressure economizer (LPE). The results of 100MW unit show that, WFGD inlet flue gas temperature drops from 155°C to 110°C, the benefits generated include power consumption of fans declines by 23.85% and water consumption of the smoke desulfurization absorption tower declines by 34.88%. In another case, the temperature of inlet flue gas from WFGD of 1000 MW unit drops from 130°C to 84°C, power consumption of fans increases by 15.04% while water consumption of the smoke desulfurization absorption tower declines by 73.1%. Besides, the flow resistance is increased in LPE water side due to the installation of LPE. This makes power consumption of condensate pump enhanced, which slightly decreases the benefits from waste heat recovery.

Mass Transfer Characteristics of Gypsum-Fly Ash Slurry for Wet Flue Gas Desulfurization

2011 ◽  
Vol 356-360 ◽  
pp. 1461-1468
Author(s):  
Dong Ping Zhang ◽  
Qian Jun Li ◽  
Xian Feng Liu
Keyword(s):  
Mass Transfer ◽  
Fly Ash ◽  
Flue Gas ◽  
Absorption Rate ◽  
Ph Value ◽  
Catalytic Efficiency ◽  
Pilot Scale ◽  
Flue Gas Desulfurization ◽  
Initial Reaction ◽  
So2 Absorption

In the limestone/gypsum wet flue gas desulfurization pilot-scale test rig, key parameters such as SO2 absorption rate, mass transfer were experimentally determined．The results show that desulphurizing capacity of gypsum and fly ash is relatively weaker, which is only equivalent to fresh limestone with a content of 0.27% and 1.5% respectively. pH-t curve of slurry with different levels of fly ash could be divided into a sharply increasing stage and a steadily increasing stage. The leaching content of Mn2+ is about 9 times of Fe3+ , Mn2+ can form intermediate complex with HSO3- in the solution, which can induce catalytic reaction and accelerate SO2 absorption. Fly ash in gypsum slurry can obviously promote desulfurization. The pH value of slurry is high at the initial reaction stage, and effect of fly ash on SO2 absorption rate is less than 1.5%. when the pH value is decreased to 5.0, The leaching content of Mn2+ will grow with the decrease of pH value, better catalytic efficiency can be gained, effect of fly ash on SO2 absorption rate can increase 6.0% at most. The reaction is controlled by liquid phase resistance; the ratio of gas phase resistance to overall resistance is less than 38%. Mn2+ concentration of slurry increases with pH value decreasing and fly ash concentration increasing, which has significant effect on catalyzed oxidation of SO32-.

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