A Novel Highly Stable Biomass Gel Foam Based on Double Cross-Linked Structure for Inhibiting Coal Spontaneous Combustion

Chao Han, Shibin Nie, Zegong Liu, Jinian Yang, Hong Zhang, Haoran Zhang, Jiayi Li and Zihan Wang
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Chao Han: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Shibin Nie: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Zegong Liu: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Jinian Yang: School of Material Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Hong Zhang: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Haoran Zhang: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Jiayi Li: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Zihan Wang: School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China

Energies, 2022, vol. 15, issue 14, 1-12

Abstract: To enhance the stability of biomass gel foam used for inhibiting coal spontaneous combustion (CSC), a novel highly stable biomass gel foam (SA-Ca 2+ @TA-GF) based on a double cross-linked structure was prepared by introducing tannic acid (TA) into a gel form (sodium alginate/calcium L-lactate/composite foaming agent). FT-IR confirmed the formation of the double cross-linked structure. The effects of TA concentration on the performance of SA-Ca 2+ @TA-GF were analyzed, considering gelation time, half-life, film microstructure, and strength. With the addition of 1.6 wt% TA, SA-Ca 2+ @TA-GF forms a dense foam structure with a gelation time of 10 min. The half-life of the gel foam improves from 0.4 to 30 days and the strength increases by 72.9% compared to that of foam without TA. The inhibition experiments show that SA-Ca 2+ @TA-GF can asphyxiate coal, thus effectively inhibiting coal oxidation. Additionally, it can increase the temperature of coal at the rapid oxidation stage by 60 °C, and the CO inhibition rate is up to 79.6% at 200 °C. The fire-fighting experiment shows that SA-Ca 2+ @TA-GF can effectively cool coal and quickly extinguish fires. This study provides a simple method to prepare highly stable biomass gel foams, which is useful for improving the efficiency of gel foams in inhibiting CSC.

Keywords: biomass gel foam; stability; double cross-linked structure; tannic acid; coal spontaneous combustion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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