scholarly journals Optimization of CO2Absorption Characteristic under the Influence of SO2in Flue Gas by Hollow Fiber Membrane Contactor

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ziyi Qu ◽  
Li Zhang ◽  
Yunfei Yan ◽  
Shunxiang Ju
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Flue Gas ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Flow Rate Ratio ◽  
Absorption Characteristic ◽  
Membrane Contactor ◽  
Gas Flow Rate ◽  
Fiber Membrane

Hollow fiber membrane contactor is a new, highly efficient, and the most promising technology for CO2absorption in flue gas. There is still SO2that exists in the flue gas after desulfurization tower of power plant. This paper studied the influence of SO2on CO2absorption characteristic in flue gas by hollow fiber membrane contactor with absorbent of EDA, EDA + MEA (0.6 : 0.4), and EDA + MEA + PZ (0.4 : 0.4 : 0.2). The influences of SO2concentration, cycle absorption and desorption characteristic of absorbent, absorbent concentration, and liquid-gas flow rate ratio are studied to analyze the influence of SO2on CO2absorption characteristic. The appropriate absorbent composition ratio and appropriate parameter range that can inhibit the influence of SO2are proposed by studying the hybrid sorbent with activating agent, appropriate absorbent concentration, and ratio of liquid-gas flow rate. Among the three kinds of absorbents, EDA + MEA + PZ (0.4 : 0.4 : 0.2) had the best tolerance ability to SO2and the highest efficiency. With comprehensive consideration of CO2removal efficiency and operating cost, under the condition of 1000 ppm SO2, the appropriate concentration and liquid-gas flow rate ratio of EDA, EDA + MEA, and EDA + MEA + PZ are proposed.

scholarly journals Effect of Feed Gas Flow Rate on CO2Absorption through Super Hydrophobic Hollow Fiber membrane Contactor

2018 ◽  
Vol 316 ◽  
pp. 012012
Author(s):  
Sutrasno Kartohardjono ◽  
Kevin Alexander ◽  
Annisa Larasati ◽  
Ivander Christian Sihombing
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Gas Flow Rate ◽  
Fiber Membrane

Experimental Study on Absorbing CO2 from Coal-Fired Flue Gas

2012 ◽  
Vol 616-618 ◽  
pp. 1546-1549
Author(s):  
Wei Feng Zhang ◽  
Jian Shao
Keyword(s):  
Experimental Study ◽  
Hollow Fiber ◽  
Flue Gas ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Mixed Solution ◽  
Fiber Membrane ◽  
Absorption Effect ◽  
Low Concentrations ◽  
Better Than

A small hollow-fiber membrane contactor system was used to test the absorption and desorption CO2 using mixed absorption solution of SG/PG and TEA. The results showed that absorption effect of SG was better than PG under low concentrations, but their desorption was the opposite. With the increase of concentration, the absorption effect of SG tended to weak, while the desorption was enhanced. And, PG was contrary. The absorption effect of mixed solution(SG+TEA, PG+TEA) was excellent when adding small amount of TEA. And, the absorption effect of TEA-SG mixed solution was amazing under the low concentration of SG. With the concentration of mixed solution increased, the auxo-action of TEA weakened. Instead, TEA played a active effect on promoting the absorption of TEA+PG mixture with the increasing of concentration. The hybrid experimental results shown that 3mol/L PG+0.1 mol/L TEA mixture absorption solution was best in absorption experiments, and 1mol/L PG+0.2 mol/L TEA mixture absorption solution was best in desorption experiments.

scholarly journals Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 704
Author(s):  
Wei Yu ◽  
Xiaoyin Li ◽  
Fangyang Yuan
Keyword(s):  
Nitric Oxide ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Operating Temperature ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Gas Channel ◽  
Membrane Tube ◽  
Reduction Efficiency

A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. The tube and lumen sides both have laminar parabolic velocity distributions. The nitric oxide concentration decreases gradually from the membrane wall to axis at the cross-section except on the inner and outer sides of the membrane tube. The equivalent diffusion length was proved useful for evaluating the entrance effect. At low concentrations, the reduction efficiency was proportional to the absorbent concentration, and at large concentrations, it neared a maximum value. The reduction efficiency was positively affected by elevated operating temperature and pressure. With a gas channel width of 13 mm, the reduction flow rate achieves its maximum. The efficiency of NO reduction per area decreases as the effective membrane length increases. Increasing the operating temperature and membrane length are recommended as design priorities due to high relative enhancements. It is not recommended to improve reduction efficiency by increasing membrane tube diameter and operating pressure in design. Changing the gas flow rate, absorbent concentration and gas channel width are moderate recommended as well.

scholarly journals Effect of flow and module configuration on SO2 absorption by using membrane contactors

2018 ◽  
Vol 19 (4) ◽  
pp. 716-725 ◽  
Keyword(s):  
Liquid Phase ◽  
Phase Velocity ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Volume Fraction ◽  
Hollow Fiber Membrane ◽  
Absorption Efficiency ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
So2 Absorption

Sulfur dioxide (SO2) emissions lead to negative environmental impacts and it is considered as an indicator for the larger group of gaseous sulfur oxides (SOx) in the air. In this paper, the dimethylamine (DMA) solution was used as the absorbent in a α-Al2O3 hollow fiber membrane contactor that is operated under several conditions of gas velocity, liquid velocity, and 290 K operating temperature. The effects of gas and liquid phase properties and module configuration on SO2 absorption efficiency in the hollow fiber membrane contactor were investigated. Simulation results showed that the changes of gas phase velocity, liquid phase velocity, and concentration have great influences on the absorption efficiency of SO2. An increase of the gas flow rate decreases the SO2 absorption efficiency, while an increase of the liquid flow rate has the opposite effect, increasing the efficiency. Because gas in the membrane module stays for a longer time, more absorption time promotes the gas and liquid reaction. However, the changes of the volume fraction of SO2 in the mixed gas are not significant to SO2 absorption. The simulation model could provide guidelines for selecting suitable fluid properties during the SO2 absorption process in a hollow fiber membrane contactor.

A study on the PP hollow fiber membrane contactor and its performances for removing ammonia from wastewater or mixed gas: I. Removal and recovery of ammonia from wastewater

2001 ◽  
Vol 1 (5-6) ◽  
pp. 185-194 ◽  
Author(s):  
Y. Xu ◽  
J. Wang ◽  
Z. Xu ◽  
H. Xu
Keyword(s):  
Transfer Coefficient ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Removal Rate ◽  
Ammonia Solution ◽  
Chemical Fertilizer ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
The Relationship

Recent research indicated that hydrophobic microporous hollow fiber membrane Contactor could be used to separate volatile contaminants from wastewater efficiently. The factors that influence the effect of separation of NH3/H2O are investigated carefully. It is found that the average diameter of micropores, porosity and gas penetration rate of polypropylene (PP) hollow fiber membrane are maximized synchronously at draw elongation 260%. The modules assembled with this PP hollow fiber membrane have good performance for separation of NH3/H2O. It is found that the overall mass transfer coefficient (K) only is dependent on the temperature and flux of ammonia solution and independent of the pressure and concentration of ammonia solution. Concentration of absorbing acid influences slightly the overall transfer coefficients K while the absorbent supply is sufficient. Under this condition, the relationship between transfer coefficient and raw ammonia water flow rate can be described using the Sieder and Tate equation. K is directly proportional to v1/3 (v stands for the flow rate of ammonia solution). The removal rate of NH3 was about 96-98% in the lab. Further industrial tests have been carried out individually in catalyst and chemical fertilizer factories to treat wastewater containing ammonium, whose concentration ranged from 1000-10,000g/m3. Wastewater treatment amount was 9.6 m3/day and 24 m3/day in catalyst and chemical fertilizer factories respectively. Average removal rate of NH3 was 93.5% during 5 months of continuous operation in the catalyst factory. The fouling is not heavy because the wastewater containing ammonia did not pass through the membrane wall. It is efficient to get rid of membrane fouling by washing the membrane with dilute acid and the cleanout period was 3 days. PP hollow fiber membrane can be produced by the melt-spinning and drawing method. This paper also investigates the relationship between processing condition of PP hollow fiber membrane and its structure and performance.

scholarly journals Effects of Absorbent Flow Rate on Co2 Absorption through a Super Hydrophobic Hollow Fiber Membrane Contactor

2017 ◽  
Vol 8 (8) ◽  
pp. 1429 ◽  
Author(s):  
Sutrasno Kartohardjono ◽  
Angeline Paramitha ◽  
Aulia Andika Putri ◽  
Ryan Andriant
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Fiber Membrane

scholarly journals Numerical Simulation and Analysis of CO2Removal in a Polypropylene Hollow Fiber Membrane Contactor

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zhien Zhang ◽  
Yunfei Yan ◽  
Li Zhang ◽  
Shunxiang Ju
Keyword(s):  
Hollow Fiber ◽  
Gas Flow ◽  
Liquid Velocity ◽  
Hollow Fiber Membrane ◽  
Pilot Scale ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method ◽  
Selection Of

This present study shows a comprehensive 2D numerical model for removal of CO2in a polypropylene (PP) hollow fiber membrane contactor (HFMC) using the computational fluid dynamics (CFD) method. Monoethanolamine (MEA) solution was used as the liquid absorbent in a nonwetting mode. The simulation results represented that higher liquid velocity and concentration and lower gas velocity and concentration led to higher percent of CO2removal. The most proper parameters for CO2removal were less than 1 mol m−3gas concentration and 0.2 m s−1gas flow rate, and for MEA the values were above 8 mol m−3concentration and approximately 1 m s−1liquid velocity. Furthermore, the model was validated with the experiment results. Therefore, the modeling results provided references to the selection of absorbents and operation parameters in the experimental study and pilot-scale applications.

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