Experiment Research on Calcium Hypochlorite for Flue Gas Desulfurization and Denitration

2012 ◽  
Vol 518-523 ◽  
pp. 2509-2513 ◽  
Author(s):  
Hai Long Liu ◽  
Yan Liu ◽  
Jin Gang Wang ◽  
Shao Feng Zhang
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Industrial Application ◽  
Flue Gas Desulfurization ◽  
Experiment Research ◽  
Calcium Hypochlorite

In this paper the desulfurization and denitration of simulation flue gas using calcium hypochlorite as absorbent was studied experimentally. Absorption experiments of the desulfurization and denitration in calcium hypochlorite solutions were carried out in a Porous Globular Gas Liquid Reactor (PGGLR) which was a new and innovative core design. Three experiments were conducted at NTP conditions. The mechanism of removal for SO2 and NOX was investigated. Under these experiment conditions, the removal efficiency of 100%, 67% for SO2 and NOX were achieved. The results can offer valuable references for industrial application.

scholarly journals Investigation on Mercury Reemission from Limestone-Gypsum Wet Flue Gas Desulfurization Slurry

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chuanmin Chen ◽  
Songtao Liu ◽  
Yang Gao ◽  
Yongchao Liu
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Industrial Application ◽  
Operating Conditions ◽  
Flue Gas Desulfurization ◽  
Mercury Removal ◽  
Slight Effect ◽  
Ph Values ◽  
Mercury Control ◽  
Partitioning Behavior

Secondary atmospheric pollutions may result from wet flue gas desulfurization (WFGD) systems caused by the reduction of Hg2+to Hg0and lead to a damping of the cobenefit mercury removal efficiency by WFGD systems. The experiment on Hg0reemission from limestone-gypsum WFGD slurry was carried out by changing the operating conditions such as the pH, temperature, Cl−concentrations, and oxygen concentrations. The partitioning behavior of mercury in the solid and liquid byproducts was also discussed. The experimental results indicated that the Hg0reemission rate from WFGD slurry increased as the operational temperatures and pH values increased. The Hg0reemission rates decreased as the O2concentration of flue gas and Cl−concentration of WFGD slurry increased. The concentrations of O2in flue gas have an evident effect on the mercury retention in the solid byproducts. The temperature and Cl−concentration have a slight effect on the mercury partitioning in the byproducts. No evident relation was found between mercury retention in the solid byproducts and the pH. The present findings could be valuable for industrial application of characterizing and optimizing mercury control in wet FGD systems.

Control of Hg0 Re-Emission from Simulated Wet Flue Gas Desulfurization Liquors by Sodium Dithiocarbamate

2012 ◽  
Vol 610-613 ◽  
pp. 1473-1477 ◽  
Author(s):  
Chuan Min Chen ◽  
Li Xing Jiang ◽  
Song Tao Liu ◽  
Yu Ze Jiang
Keyword(s):  
Oxygen Concentration ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Industrial Application ◽  
Inhibition Efficiency ◽  
Operating Conditions ◽  
Flue Gas Desulfurization ◽  
Mercury Removal ◽  
Ph Values ◽  
Oxygen Concentrations

Secondary atmospheric pollutions may result from wet flue gas desulfurization (WFGD) systems caused by the reduction of Hg2+to Hg0and lead to a damping of the co-benefit mercury removal efficiency by WFGD systems. The effects of the operating conditions, which included the pH, temperature, and oxygen concentrations, on Hg0re-emission inhibition efficiency by DTCR from WFGD liquors was carried out. The established data reflected an outstanding performance on the Hg0re-emission inhibition from the simulated WFGD liquors by adding DTCR. Our data suggested that a concentration of 0.0005% (v/v) was enough for Hg0re-emission inhibition in the simulated WFGD liquors. The results also indicated that the Hg0re-emission inhibition efficiency by adding DTCR decreased as the operational temperatures increased and the Hg0re-emission inhibition efficiency increased as pH values and the oxygen concentration in the flue gas increased. The present findings could be valuable for industrial application of DTCR as a precipitant for stabilizing dissolved Hg2+to prevent re-emission of Hg0in WFGD solutions.

Mass Balance and Isotope Characteristics of Mercury in Two Coal-Fired Power Plants in Guizhou, China

2012 ◽  
Vol 518-523 ◽  
pp. 2576-2579 ◽  
Author(s):  
Zhong Gen Li ◽  
Xin Bin Feng ◽  
Guang Hui Li ◽  
Run Sheng Yin ◽  
Ben Yu
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Isotope Composition ◽  
Flue Gas Desulfurization ◽  
Guizhou Province ◽  
Mercury Removal ◽  
Stable Isotope Composition ◽  
Coal Properties

Mercury distribution and stable isotope composition in solid samples of two coal-fired power plants in Guizhou province were determined. Results shown electrostatic precipitator (ESP) has mercury removal efficiency between 29.53% to 58.41%, and wet flue gas desulfurization (WFGD) between 12.29% to 58.60%, mercury removal efficiency of ESP and WFGD mainly depends on the coal properties. Most mercury (70% to 88%) in coal was captured by the combination of ESP+WFGD. Mercury in fly ash and gypsum were much heavier in isotope composition compared to the coal, hints mercury escaped into atmosphere was enriched in lighter mercury isotopes.

scholarly journals Synergistic removal of dust using the wet flue gas desulfurization systems

2019 ◽  
Vol 6 (7) ◽  
pp. 181696 ◽  
Author(s):  
Qirong Wu ◽  
Min Gu ◽  
Yungui Du ◽  
Hanxiao Zeng
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Flue Gas Desulfurization ◽  
Dust Removal ◽  
Dust Particles ◽  
Experimental Conditions ◽  
Collision Model ◽  
Sieve Tray ◽  
Spray Scrubber

Coal is still a major energy source, mostly used in power plants. However, the coal combustion emits harmful SO 2 and fly ash. Wet flue gas desulfurization (WFGD) technology is extensively used to control SO 2 emissions in power plants. However, only limited studies have investigated the synergistic dust removal by the WFGD system. Spray scrubbers and sieve-tray spray scrubbers are often used in WFGD systems to improve the SO 2 removal efficiency. In this study, the synergistic dust removal of WFGD systems for a spray scrubber and a sieve-tray spray scrubber was investigated using the experimental and modelling approaches, respectively. For the spray scrubber, the influence of parameters, including dust particle diameters and inlet concentrations of dust particles, and the flow rates of flue gas and slurry of limestone/gypsum on the dust removal efficiency, was investigated. For the sieve-tray spray scrubber, the influence of parameters such as the pore diameter and porosity of sieve trays on the dust removal efficiency was examined. The study found that the dust removal efficiency in the sieve-tray spray scrubber was approximately 1.1–10.6% higher than that of the spray scrubber for the same experimental conditions. Based on the parameters investigated and geometric parameters of a scrubber, a novel droplets swarm model for dust removal efficiency was developed from the single droplet model. The enhanced dust removal efficiency of sieve tray was expressed by introducing a strength coefficient to an inertial collision model. The dust removal efficiency model for the sieve-tray spray scrubber was developed by combining the droplets swarm model for the spray scrubber with the modified inertial collision model for the sieve tray. The results simulated using both models are consistent with the experimental data obtained.

New Wet Flue Gas Desulfurization Process Using Granular Limestone and Organic Acid Additives

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Shengyu Liu ◽  
Wende Xiao
Keyword(s):  
Acetic Acid ◽  
Sulfur Dioxide ◽  
Organic Acid ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
So2 Removal ◽  
New Process ◽  
Desulfurization Process ◽  
Sulfur Dioxide Removal

A new wet FGD process in which sulfur dioxide was absorbed in the bubble reactor using granular limestone simultaneously adding acetic acid had been proposed. The main difference compared to conventional wet FGD process was the ability of the new process to utilize granular limestone directly as a desulphurization reagent simultaneously adding acetic acid. Thus, the pulverizing of limestone, which causes power consumption, can be saved. Only using granular limestone directly as absorbent without acetic acid, SO2 removal efficiency and limestone utilization were too low. Adding some concentration of acetic acid, the performance of the new wet FGD process was confirmed to be equal to or higher than that of a conventional process in various tests. Various parameters of the new FGD process which would affect the sulfur dioxide removal efficiency and limestone utilization were studied.

The Study on the Performance of Wet Limestone-Gypsum Flue Gas Mercury Removal Additive

2013 ◽  
Vol 448-453 ◽  
pp. 608-612
Author(s):  
Li Bao Yin ◽  
Qi Sheng Xu ◽  
Jiang Jun Hu ◽  
Yang Heng Xiong ◽  
Si Wei Chen
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Total Mercury ◽  
Elemental Mercury ◽  
Flue Gas Desulfurization ◽  
Mercury Removal ◽  
Additive Increase ◽  
Calcium Sulfite

The influences on the performance of wet flue gas desulfurization system in mercury removing after adding mercury removal additive were studied. As a consequence, the mercury removal efficiency can be improved by this kind of additive, that the efficiency of elemental mercury and total mercury is raised along with the amount of additive is increased. And so can the desulfuration efficiency. The oxidation of calcium sulfite in desulfurization is promoted by the mercury removal additive, increase the reduce speed of calcium sulfite concentration.

scholarly journals Desulfurization performance of biotrickling filter on the removal of flue gas adsorbent produced by dual-alkali flue gas desulfurization process

2014 ◽  
Vol 5 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Tianlong Zheng ◽  
Li Wang ◽  
Jianhua Wang ◽  
Niantao Xue ◽  
Qunhui Wang
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Impact Resistance ◽  
Biotrickling Filter ◽  
Flue Gas Desulfurization ◽  
Sulfate Reducing ◽  
Initial Ph ◽  
Restoration Time ◽  
Desulfurization Process ◽  
Adsorbent Treatment

A biotrickling filter (BTF) was used to investigate the elimination of flue gas adsorbent containing sulfite, sulfate, and hydrosulfate; it was undertaken to replace the regeneration step of dual-alkali flue gas desulfurization. Sulfate-reducing bacteria (SRB) isolated from landfill leachate were inoculated, and overall desulfurization performance as well as impact resistance was evaluated. The results showed that an efficient SRB could reduce the start-up time to 1 h, which is one third of that required for initial condition, for a sulfite removal efficiency above 80%. Further, the sulfite removal efficiency rose to 98% in 3.9 h with the lower packing load of 5.56 kg SO32−-S/(m3d), and in 6.4 h for 6.37 kg SO32−-S/(m3d). In contrast, 85% removal efficiency in 5 h for sulfate and 98% removal efficiency in 0.5 h for hydrosulfite were obtained when the packing loads were 0.95 kg SO42−-S/(m3d) and 1.76 kg HSO3−-S/(m3 d), respectively. Moreover, the BTF could quickly restore after impact shock, such as, 0.5 h restoration time for initial pH which varied from 4.5 to 6.5, 6 d for 27 d shutdown behavior, and 4 d for 5 h high temperature shock of 85 °C. Therefore, the BTF system was an effective method for flue gas adsorbent treatment.

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