Modelling Flue Gas Desulfurization Using Pyrolusite Pulp in a Jet Bubbling Reactor

2009 ◽  
Vol 610-613 ◽  
pp. 85-96 ◽  
Author(s):  
Jing Dong Zhao ◽  
Shi Jun Su ◽  
Nan Shan Ai ◽  
Xiao Fan Zhu
Keyword(s):  
Flue Gas ◽  
Ph Value ◽  
Scale Up ◽  
Absorption Efficiency ◽  
Flue Gas Desulfurization ◽  
Process Conditions ◽  
Gas Temperature ◽  
Transfer Coefficients ◽  
Set Up ◽  
So2 Absorption

A mathematical model for flue gas desulfurization using pyrolusite pulp in jet bubbling reactor (JBR) was described. Firstly, based on the concept of two stages mass balance with chemical reaction, two models were set up, for jet bubbling zone and rising bubble zone, respectively, according to the construction of JBR. The models consist of two coupling differential equations and were solved simultaneously by integral and separation of the variables. Then the SO2 absorption efficiency expression was developed, considering the great discrepancy existing between the gas-side mass transfer coefficients of the jet bubbling zone and gas bubble rising zone. The final expression associates SO2 absorption efficiency with process conditions and JBR structure parameters, which can give some instruction and guidance for the study of reactor operation process. Predicted results from the theoretical model, including effect of pH value of the pulp, flue gas temperature and inlet SO2 concentration of flue gas on SO2 absorption efficiency, were found to be in good agreement with experimental data obtained in a jet bubbling reactor. The model provides a basis for the process scale up and operating guide.

Experimental Study on Macro-Kinetics of Flue Gas Desulfurization Using Pyrolusite Pulp by a Double Magnetic Stirred Reactor

2009 ◽  
Vol 610-613 ◽  
pp. 32-40 ◽  
Author(s):  
Jing Dong Zhao ◽  
Shi Jun Su ◽  
Xiao Fan Zhu ◽  
Hong Lei Wang
Keyword(s):  
Liquid Phase ◽  
Gas Phase ◽  
Flue Gas ◽  
Particle Diameter ◽  
Absorption Efficiency ◽  
Flue Gas Desulfurization ◽  
Stirred Reactor ◽  
Control Step ◽  
Kinetics Of ◽  
So2 Absorption

It’s a gas-liquid-solid three-phase reaction system in the reactor for flue gas desulfurization using pyrolusite pulp. Based on the two-film mass transfer theory and shrine core model, the macro-kinetics of flue gas desulfurization using pyrolusite pulp in a double magnetic stirred reactor were investigated. The effects of diffusion in solid film, surface chemical reaction, diffusion in liquid phase and gas phase of the process, have been carried out to distinguish the control step of the process. It was observed that SO2 absorption efficiency increased with the decreasing of pyrolusite particle size and varied gently when the pyrolusite particle diameter decreased to 0.18mm. SO2 absorption efficiency increased not significantly along with the increase of temperature and the liquid phase stirring speed but increased significantly along with the increase of the gas phase stirring speed. Experiment results showed that under simulated industrial conditions, gas phase diffusion was the control step compared to other related factors, given that pyrolusite particle diameter was kept below 0.1mm.

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-.

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.

Experimental Study on Desulfurization Enhanced by Additive in Limestone-Gypsum FGD Process

2014 ◽  
Vol 675-677 ◽  
pp. 422-425
Author(s):  
Jun Xia Liu
Keyword(s):  
Flue Gas ◽  
Gas Flow ◽  
High Efficiency ◽  
Ph Value ◽  
Flue Gas Desulfurization ◽  
Gas Flow Rate ◽  
Lime Solution ◽  
Desulfurization Efficiency ◽  
Technical Features ◽  
Hexanedioic Acid

This Paper introduced the research background and technical features of the simulative experiments in the laboratory with the sorbent of lime solution without lime particles. By means of the effects of various influencing factors on SO2 removal efficiency were studied carefully. These parameters include gas flow rate (G), inlet SO2 concentration, liquid-to-gas ratios, the height of the packing and the additive, at the same time menstruating the pH value of the liquid flowing from the tower. To improve desulfurization efficiency of limestone in the wet flue gas desulfurization (WFGD), effect of the hexanedioic acid additive on limestone desulfurization agent were studied. The result shows that this system has advantages of high efficiency, stable, low investment and low circulating cost. The result could give a reference to optimization and will be helpful in selecting desulfurization techniques.

Industrial flue gas desulfurization waste may offer an opportunity to facilitate SANI® application for significant sludge minimization in freshwater wastewater treatment

2013 ◽  
Vol 67 (12) ◽  
pp. 2822-2826 ◽  
Author(s):  
J. Qian ◽  
F. Jiang ◽  
H. K. Chui ◽  
Mark C. M. van Loosdrecht ◽  
G. H. Chen
Keyword(s):  
Wastewater Treatment ◽  
Flue Gas ◽  
Industrial Effluent ◽  
Flue Gas Desulfurization ◽  
Synthetic Wastewater ◽  
Autotrophic Denitrification ◽  
Carbon And Nitrogen ◽  
Sludge Minimization ◽  
Denitrification Reactor ◽  
Set Up

This paper reports an exploratory study on the use of a sulfite-rich industrial effluent to enable the integration of a sulfite–sulfide–sulfate cycle to the conventional carbon and nitrogen cycles in wastewater treatment to achieve sludge minimization through the non-sludge-producing Sulfate reduction, Autotrophic denitrification and Nitrification Integrated (SANI) process. A laboratory-scale sulfite reduction reactor was set up for treating sulfite-rich synthetic wastewater simulating the wastewater from industrial flue gas desulfurization (FGD) units. The results indicated that the sulfite reduction reactor can be started up within 11 d, which was much faster than that using sulfate. Thiosulfate was found to be the major sulfite reduction intermediate, accounting for about 30% of the total reduced sulfur in the reactor effluent, which may enable additional footprint reduction of the autotrophic denitrification reactor in the SANI process. This study indicated that it was possible to make use of the FGD effluent for applying the FGD–SANI process in treating freshwater-based sewage.

scholarly journals Research on selectivity removing SO2 from flue gas with a novel absorbent

2006 ◽  
Vol 2 (2) ◽  
pp. 110-119
Author(s):  
Wanren Chen ◽  
Hua Li ◽  
Xiaoshuang Chen
Keyword(s):  
Organic Solvent ◽  
Flue Gas ◽  
Industrial Application ◽  
Absorption Efficiency ◽  
Laboratory Research ◽  
The Novel ◽  
Traditional Methods ◽  
Solvent Absorption ◽  
Desulfurization Efficiency ◽  
So2 Absorption

Compared with the traditional methods of removal SO2 from flue gas, the organic solvent absorption has some advantages as low investment, high SO2 absorption efficiency and desorption efficiency. For the industrial application of organic solvent absorption as soon as possible, some laboratory research on selectively removing SO2 and NOx from flue gas in the presence of CO2 and an enlarged experiment has been done with a novel absorbent of Mn(II)+ DMSO. The effect on desulfurization selectivity for absorbents is studied. And the regeneration capacities for absorbent are researched. The result shows that the novel absorbent has not only strong desulfurization efficiency, but also good selectivity for SO2 and CO2, the feasibility of desulfurization absorbent has been proved.

Dissolution Rate of Limestone for Wet Flue Gas Desulfurization in the Presence of Citric Acid

2011 ◽  
Author(s):  
Rui-tang Guo ◽  
Wei-guo Pan ◽  
Xiao-bo Zhang ◽  
Jiang Wu ◽  
Jian-xing Ren
Keyword(s):  
Citric Acid ◽  
Dissolution Rate ◽  
Flue Gas ◽  
Ph Value ◽  
Flue Gas Desulfurization ◽  
Calcium Citrate ◽  
Inhibition Effect ◽  
Limestone Dissolution ◽  
Ph Stat ◽  
Stat Method

Dissolution rate of limestone for wet flue gas desulfurization in the presence of citric acid was measured by pH-stat method. It was found that limestone dissolution rate in the presence of citric acid was controlled by mass transfer. As can be seen from the experimental results, in the presence of citric acid, limestone dissolution rate increased with increasing stirring speed and reaction temperature. When pH value was greater than or equal to 5.5, due to the formation of calcium citrate, citric acid would inhibit the dissolution process of limestone. And the inhibition effect was more obvious at higher pH value.

scholarly journals Combined Removal Of NOx And SO2 From Flue Gas At Low Temperature

2018 ◽  
Vol 53 ◽  
pp. 04038 ◽  
Author(s):  
Zhipeng Xue ◽  
Hao Chen ◽  
Minmin Zhao
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Gas Flow ◽  
Ph Value ◽  
National Standards ◽  
Raw Material ◽  
Nox Removal ◽  
Gas Temperature ◽  
Solution Ph ◽  
Nox Removal Efficiency

A method was proposed to remove NOx and SO2 in flue gas by using the sulfinyl functional group as a catalyst. Ozone is introduced into the flue gas to oxidize NO. Soluble NO2 and SO2 reacted with ammonia to form ammonium sulfate and ammonium nitrate, which were the raw material of the compound fertilizer. A small pilot is built in a container that can be easily transported to power plant and extracts the actual flue gas directly from the gas duct. In order to obtain the best the SO2 and NOX removal efficiency in this experiment, many parameters were changed. Such as flue gas flow, ozone / NOX ratio, liquid-gas ratio, flue gas temperature, catalyst type, catalyst concentration, solution pH value. Results indicated that SO2 was cleaned up quite efficiently and the removal efficiency was nearly 99% under all conditions. the best NOX removal efficiency can reach 88%. The NOX removal efficiency depended primarily on ozone / NOX ratio, and the temperature of flue gas also had influence on the NOX removal efficiency. The optimum pH range is 5.6-6.3. After inspection by authoritative institutions, the quality of fertilizers is superior to national standards.

Study of Dual-Alkali on Sintering Flue Gas Desulfurization

2011 ◽  
Vol 393-395 ◽  
pp. 304-307
Author(s):  
Yu Zhu Zhang ◽  
Ying Xu
Keyword(s):  
Flue Gas ◽  
Gas Flow ◽  
Ph Value ◽  
Surface Active Agent ◽  
Active Agent ◽  
Development Trend ◽  
Flue Gas Desulfurization ◽  
Before And After ◽  
Selection Principles ◽  
Desulfurization Process

Combining with the characteristics and control methods of sintering flue gas, several common methods for flue gas desulfurization(FGD) and development trend of desulfurization technology were described in this paper. According to characteristics of sintering flue gas and selection principles, dual-alkali method was used in the FGD. Desulfurization process, basic principle and characteristics of the process were studied in detail. By contrast test, the effect of concentration of the desulfurization, flue gas flow and surface active agent on the desulfurization efficiency was investigated in detail through calculating the pH value of the solution before and after desulfurization reaction.

scholarly journals Examination of the influence of macro and microscopic parameters of limestone on the effectiveness of gas phase desulphurisation according to the method of wet limestone

2018 ◽  
Vol 44 ◽  
pp. 00152
Author(s):  
Elżbieta Romanik
Keyword(s):  
Grain Size ◽  
Chemical Composition ◽  
Gas Phase ◽  
Flue Gas ◽  
Ph Value ◽  
Global Scale ◽  
Flue Gas Desulfurization ◽  
Correlation Dependence ◽  
Purchase Cost ◽  
Desulfurization Process

The essence of the research was to develop a correlation dependence between the degree of limestone grinding and the efficiency of boiler flue gas desulfurization. The design of the Installation of Flue Gas Desulfurization (FGD) in the slurry of ground limestone begins with the assumption (based on literature data or experience gained from previously completed and operated installations) of a certain pH value of this slurry in the reactor tank. The reagent is not yet indicated, its extraction location, its chemical composition, grain size and reactivity are not determined. Application practice and economics of these processes have shown that calcium reagents are the most advantageous in application because of the general availability of limestone, its large mining resources, existing infrastructure for its extraction, the network of suppliers and the purchase cost acceptable by the recipients. On a global scale, more than 90% of the flue gas desulfurization plant is treated with limestone [1]. The effectiveness of the desulfurization process is high, and some believe that the decisive influence is on the degree of limestone fragmentation dissolution rate of CaCO3 in the absorption slurry, its reactivity to absorbed SO2, the pH of the absorption slurry.

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