Search

Your search keyword '"Yang, Zhengda"' showing total 269 results
Start Over Author "Yang, Zhengda"
269 results on '"Yang, Zhengda"'

16. Research status of amine aerosol formation and emission in amine carbon capture process

Author

YANG Zhengda, XIAN Zhennan, SHAO Lingyu, and ZHENG Chenghang

Subjects
amine carbon capture, organic amine, amine aerosol, simultaneous control, Renewable energy sources, TJ807-830, Environmental protection, TD169-171.8
Abstract

Post-combustion CO_2 absorption by amine has great potential for large-scale carbon capture and industrial promotion. However, in the process of efficiently absorbing CO_2, part of the absorbers will leave the carbon capture system in the form of aerosol along with the flue gas, which will not only lead to abnormal operation of the equipment but also cause environmental pollution. Therefore, the emission control of amine aerosol has become a new issue to be solved urgently in the industrial promotion of amine carbon capture. However, the amine carbon capture is still in the demonstration stage. Although attention has been paid to the emission control of amine aerosols at home and abroad, the formation and evolution of amine aerosols is a complex process affected by many factors such as absorption parameters and flue gas components. The actual emission of amine aerosols is quite different, which poses a challenge for the development of efficient and low-cost control technology and the establishment of emission limits. This paper introduces the significance of heterogeneous nuclei in heterogeneous nucleation of amine aerosols. The test methods of amine aerosol concentration and size are summarized. The emission of amine aerosols measured by different research institutions are compared. The size distribution characteristics of amine aerosols under different heterogeneous nuclei are determined. The effects of heterogeneous nuclei, CO_2 concentration, lean liquid temperature and solvent load on the formation and emission of amine aerosols are analyzed. Finally, the advantages and disadvantages of three types of amine emission control technologies, such as condensation pretreatment, in-tower regulation and efficient tail control, are summarized. In the future, the emission control of amine aerosols in amine carbon capture system should be integrated into the whole process of pollution reduction and carbon reduction, from reducing the formation of amine aerosols to promoting the aggregation and growth of amine aerosols, and finally realizes the collaborative control of multiple pollutants.

Published
2023
Full Text
View/download PDF

39. Particle Conditioning for Improving Blockage Resistance of Denitration Catalysts in Sintering Flue Gas.

Author

Sun, Deshan, Li, Peiyuan, Zhou, Can, Chen, Linghong, Yang, Yang, Yang, Zhengda, Wang, Yifan, and Zheng, Chenghang

Subjects
FLY ash, FLUE gases, X-ray fluorescence, PRESSURE drop (Fluid dynamics), ALKALI metals
Abstract

The stability and safety of selective catalytic reduction (SCR) systems are threatened by potential catalyst blockages caused by fly ash deposition. This paper proposes to improve the blockage resistance of denitration catalysts for sintered fly ash through particle conditioning. X-ray fluorescence spectroscopy, scanning electron microscopy, and laser particle analyzer were combined with laboratory heating experiments and field tests for systematic research. The results indicate that the composition and morphology of sintered fly ash are intrinsic factors contributing to catalyst blockage, while heating conditions act as external triggers. The sintered fly ash primarily exhibits a fluffy, branched cotton-like structure. Its main components are K2O, Fe2O3, Na2O, and CaO, with the alkali metal oxides of potassium and sodium comprising 20% to 50%. At ambient temperature, sintered fly ash presents no agglomeration, but significant agglomeration occurs as temperature increases. Particle conditioning effectively inhibits the agglomeration tendency of sintered fly ash. Field tests show that catalyst activity remains unaffected even under severe blockage conditions. The pressure drop across the catalyst layers increases progressively, with the first layer displaying the least pressure drop and the third displaying the most. After particle conditioning, the pressure drop across the catalyst is stabilized at values below 600 Pa, effectively mitigating the blockage issue in the denitrification catalyst for sintering flue gas. This research provides critical technical support for the stable ultra-low emission of NOx from sintering flue gas. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

49. Mass transfer characteristics of multi-pollutants in nano-pores of CeO2-TiO2based SCR catalyst: A molecular dynamics study

Author

Zhang, Xiang, Jiang, Ye, Zhang, Guomeng, Sun, Xin, Song, Jiayao, Cheng, Siyuan, and Yang, Zhengda

Abstract

Molecular dynamics (MD) simulation was carried out to investigate the diffusion behaviors of NH3and flue gases on CeO2-TiO2(CT) catalyst for the selective catalytic reduction of NO with NH3. The influence of temperature, gas mixtures, and slit width of catalyst on the diffusivity of the target molecules were studied. The results showed that both temperature and the competitive diffusion of the target molecules substantially impact gas diffusion within nano-slits. The NH3diffusion was demonstrated to have heightened sensitivity to temperature fluctuations. SO2showed the greatest hindering effect in all of five gases. The negative effect on NH3diffusion was greater when H2O existed in the form of hydroxyl groups. Increasing the slit distance of catalyst significantly mitigated this effect, with a decrease in diffusion impedance from 32.51 % to 5.01 % as the distance expanded from 2.5 nm to 7.5 nm. As for NO, a similar suppressive effect was observed when mixed with SO2, but the influence of hydroxyl groups was notably less pronounced compared to NH3. Specifically, there was only a decrease of 15.14 % at a distance of 2.5 nm, followed by almost no decrease when the distance was increased to 7.5 nm.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results