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 Effects of salts on limestone dissolution rate in wet limestone flue gas desulfurization.

1993 ◽  
Vol 26 (1) ◽  
pp. 112-113 ◽  
Author(s):  
Naohiko Ukawa ◽  
Susumu Okino ◽  
Michio Oshima ◽  
Tsuyoshi Oishi
Keyword(s):  
Dissolution Rate ◽  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Limestone Dissolution

Effects of salts on limestone dissolution rate in wet limestone flue gas desulfurization

1993 ◽  
Vol 12 (4) ◽  
pp. 294-299 ◽  
Author(s):  
Naohiko Ukawa ◽  
Toru Takashina ◽  
Michio Oshima ◽  
Tsuyoshi Oishi
Keyword(s):  
Dissolution Rate ◽  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Limestone Dissolution

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 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.

Limestone dissolution in flue gas desulfurization-experimental and numerical study

2010 ◽  
Vol 85 (9) ◽  
pp. 1208-1214 ◽  
Author(s):  
Selene M. A. Guelli U. Souza ◽  
Fabiane B. F. Santos ◽  
Antonio Augusto Ulson de Souza ◽  
Fernando Vidal Barrero
Keyword(s):  
Flue Gas ◽  
Numerical Study ◽  
Flue Gas Desulfurization ◽  
Limestone Dissolution

Dissolution rate of magnesium hydrate for wet flue gas desulfurization

Fuel ◽  
2011 ◽  
Vol 90 (1) ◽  
pp. 7-10 ◽  
Author(s):  
Rui-tang Guo ◽  
Wei-guo Pan ◽  
Xiao-bo Zhang ◽  
Hong-jian Xu ◽  
Jian-xing Ren
Keyword(s):  
Dissolution Rate ◽  
Flue Gas ◽  
Flue Gas Desulfurization

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.

Dissolution Rate of Paper White Mud at Constant pH

2011 ◽  
Vol 356-360 ◽  
pp. 1371-1374 ◽  
Author(s):  
Jian Li Zhao ◽  
Zhao Yan Fan ◽  
Ying Jie Li ◽  
Kui Hua Han ◽  
Chun Mei Lu
Keyword(s):  
Particle Size ◽  
Dissolution Rate ◽  
Reaction Temperature ◽  
Ph Value ◽  
Dissolution Kinetic ◽  
Direct Function ◽  
Shrinking Core ◽  
Stat Method ◽  
C 50 ◽  
White Mud

The dissolution of paper white mud(PWM) has been studied by pH-stat method in various parameters such as the pH values(4.3, 5.4, 6.0, 7.5), sorbent particle sizes (0-0.097mm, 0.097-0.105mm, 0.105-0.3mm), and the reaction temperature (30°C, 40°C, 50°C) in order to investigate the feasibility of using PWM as wet flue gas desulphurization sorbent. The results show that: the lower the pH value is, the higher the dissolution rate; particle size is the direct function of dissolution rate, the smaller the size is, the higher the dissolution rate, the optimal particle size in this work is 0-0.097mm; and reaction temperature has slightly influence on PWM dissolution. Kinetic analysis of the results show that the PWM dissolution is controlled by fluid film diffusion according to shrinking core model and the activation energy is 11.9±0.7 kJmol-1.

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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