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.

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.

Application of Disk Aerators to Recarbonation of Alkaline Wastewater from Wet Gasification of Carbide

1991 ◽  
Vol 24 (7) ◽  
pp. 277-284 ◽  
Author(s):  
E. Gomólka ◽  
B. Gomólka
Keyword(s):  
Carbon Dioxide ◽  
Liquid Phase ◽  
Gas Phase ◽  
Flue Gas ◽  
Carbonic Acid ◽  
Low Cost ◽  
Flue Gases ◽  
Carbon Dioxide Content ◽  
Patent Claim ◽  
Phase Dispersion

Whenever possible, neutralization of alkaline wastewater should involve low-cost acid. It is conventional to make use of carbonic acid produced via the reaction of carbon dioxide (contained in flue gases) with water according to the following equation: Carbon dioxide content in the flue gas stream varies from 10% to 15%. The flue gas stream may either be passed to the wastewater contained in the recarbonizers, or. enter the scrubbers (which are continually sprayed with wastewater) from the bottom in oountercurrent. The reactors, in which recarbonation occurs, have the ability to expand the contact surface between gaseous and liquid phase. This can be achieved by gas phase dispersion in the liquid phase (bubbling), by liquid phase dispersion in the gas phase (spraying), or by bubbling and spraying, and mixing. These concurrent operations are carried out during motion of the disk aerator (which is a patent claim). The authors describe the functioning of the disk aerator, the composition of the wastewater produced during wet gasification of carbide, the chemistry of recarbonation and decarbonation, and the concept of applying the disk aerator so as to make the wastewater fit for reuse (after suitable neutralization) as feeding water in acetylene generators.

Kinetic model for calcium sulfate α-hemihydrate produced hydrothermally from gypsum formed by flue gas desulfurization

2015 ◽  
Vol 48 (3) ◽  
pp. 827-835 ◽  
Author(s):  
Mingliang Tang ◽  
Xuerun Li ◽  
Yusheng Shen ◽  
Xiaodong Shen
Keyword(s):  
Flue Gas ◽  
Calcium Sulfate ◽  
High Performance ◽  
Transformation Process ◽  
Flue Gas Desulfurization ◽  
Synthesis Process ◽  
Stable Phase ◽  
Hydrothermal Conditions ◽  
Simple Method ◽  
Kinetics Of

Modeling of the kinetics of the synthesis process for calcium sulfate α-hemihydrate from gypsum formed by flue gas desulfurization (FGD) is important to produce high-performance products with minimal costs and production cycles under hydrothermal conditions. In this study, a model was established by horizontally translating the obtained crystal size distribution (CSD) to the CSD of the stable phase during the transformation process. A simple method was used to obtain the nucleation and growth rates. A nonlinear optimization algorithm method was employed to determine the kinetic parameters. The model can be successfully used to analyze the transformation kinetics of FGD gypsum to α-hemihydrate in an isothermal batch crystallizer. The results showed that the transformation temperature and stirring speed exhibit a significant influence on the crystal growth and nucleation rates of α-hemihydrate, thus altering the transformation time and CSD of the final products. The characteristics obtained by the proposed model can potentially be used in the production of α-hemihydrate.

Dissolution Reactivity and Kinetics of Low-Grade Limestone for Wet Flue Gas Desulfurization

2020 ◽  
Vol 59 (32) ◽  
pp. 14242-14251 ◽  
Author(s):  
Shuaiwei Gu ◽  
Zhizhong Yang ◽  
Zhen Chen ◽  
Changfu You
Keyword(s):  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Low Grade ◽  
Kinetics Of

Research on the thermal decomposition and kinetics of byproducts from MgO wet flue gas desulfurization

2014 ◽  
Vol 25 (6) ◽  
pp. 1709-1714 ◽  
Author(s):  
L.Y. Yan ◽  
X.F. Lu ◽  
Q. Guo ◽  
Q.H. Wang ◽  
X.Y. Ji
Keyword(s):  
Thermal Decomposition ◽  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Kinetics Of

scholarly journals Study on the kinetics of S(iv) oxidation in the basic aluminum sulfate wet flue gas desulfurization process

RSC Advances ◽  
2017 ◽  
Vol 7 (62) ◽  
pp. 39341-39348 ◽  
Author(s):  
Min Chen ◽  
Xianhe Deng ◽  
Feiqiang He
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Flue Gas ◽  
Aluminum Sulfate ◽  
Solution Concentration ◽  
Flue Gas Desulfurization ◽  
Desulfurization Process ◽  
Rich Solution ◽  
Kinetics Of ◽  
Basic Aluminum

Through a stirred bubbling apparatus, the kinetics of S(iv) oxidation in basic aluminum sulfate (BAS) rich solution were investigated by varying the components of the BAS solution, concentration of S(iv), temperature, air flow and oxygen partial pressure.

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