Study on Properties of Hydrophilic Modified Polypropylene Regular Filler by Melt Blending in Carbon Dioxide Capture Tower

doi:10.12096/j.2096-4528.pgt.23144

Abstract

Abstract:

Objectives At present, most amine based CO₂ capture systems for flue gas use stainless steel filled towers. In order to significantly reduce the cost of filled towers, this paper proposes the use of polypropylene structured filler instead of high cost stainless steel structured filler, thereby reducing the investment cost of absorption towers in CO₂ capture systems after combustion. Methods Using plastic fillers instead of stainless steel fillers, the selected polypropylene material and 30% mass fraction of polypropylene grafted maleic anhydride (PP-g-MAH) particles are mixed, and then they are melt blended to form regular fillers. On the constructed testing platform for fluid dynamics and mass transfer performance of fillers, different filler properties are tested. Results The dry tower pressure drop of regular fillers of 410Y and 350Y modified by melt blending of polypropylene and polypropylene grafted maleic anhydride is similar to that of stainless steel 500Y. The effective specific surface area of modified polypropylene filler 350Y is close to that of stainless steel filler 350Y with the same nominal specific surface area. Under liquid-phase loading conditions in the CO₂ amine reaction absorption tower, the effective specific surface area of polypropylene filler of 350Y is about 90% of that of stainless steel filler of 350Y. Conclusions The modified polypropylene filler has similar performance to stainless steel filler and can replace stainless steel filler in practical applications, significantly reducing the investment cost of absorption towers in CO₂ capture systems.

Key words: carbon capture, chemical absorption, polypropylene filler, polypropylene grafted maleic anhydride (PP-g-MAH), filler performance, stainless steel filler, effective specific surface area

CLC Number:

TK 09

Ximing HU, Wenfeng DONG, Zhengrong WANG, Luchang SUN, Kailiang WANG, Chao LI, Mengxiang FANG, Zhifu LI. Study on Properties of Hydrophilic Modified Polypropylene Regular Filler by Melt Blending in Carbon Dioxide Capture Tower[J]. Power Generation Technology, 2025, 46(2): 296-303.

Figures/Tables 9

Fig. 1 Polypropylene filler production plant

Tab. 1 Parameters of polypropylene regular fillers of 410Y and 350Y

填料型号	比表面积/(m²/m³)	波纹波距/mm	波纹波峰/mm	波纹边长/mm	板片厚度/mm
410Y PP	410	8.00	6.25	10.1	0.8
350Y PP	350	7.66	8.59	11.5	1.0

Fig. 2 Filler fluid mechanics and mass transfer performance testing platform

Fig. 3 Comparison of dry tower pressure drop between polypropylene fillers and stainless steel fillers

Fig. 4 Comparison of wet tower pressure drop between polypropylene fillers and stainless steel fillers

Fig. 5 Liquid holding capacity of experimental polypropylene fillers

Fig. 6 Comparison of specific surface area utilization between polypropylene fillers and stainless steel fillers

Fig. 7 Effective specific surface area correction factor of polypropylene regular fillers

Fig. 8 Mass change of polypropylene flat plate soaked in absorbent

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