A novel biomass sodium alginate gel foam to inhibit the spontaneous combustion of coal

Han, Chao; Nie, Shibin; Liu, Zegong; Liu, Song; Zhang, Hong; Li, Jiayi; Zhang, Haoran; Wang, Zihan

doi:10.1016/j.fuel.2021.122779

Cited by 42 publications

(18 citation statements)

References 54 publications

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“…Sodium alginate (SA) was provided by Shanghai Maclean Biochemical Co., Ltd., (Shanghai, China). Composite foaming agent (CFA) was made in the laboratory and mainly included tea saponins and alkyl glycosides [27]. The best foaming property of CFA was achieved when the complex ratio of tea saponin and alkyl glycosides was 1:2.…”

Section: Methodsmentioning

confidence: 99%

“…TA contains a large number of catechol and pyrogallol groups, thus, it is easy to couple with other materials by means of hydrogen bonding, etc., to form cross-linked structures [25,26]. For example, Hu et al [27] prepared a double cross-linked hydrogel (PAA-CS@TA-Al 3+ ) by using TA to form hydrogen bonds with chitosan and polyacrylic acid. The results showed that the elongation at break of PAA-CS@TA-Al 3+ reached 1700% with an increasing cross-linked structure.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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To enhance the stability of biomass gel foam used for inhibiting coal spontaneous combustion (CSC), a novel highly stable biomass gel foam (SA-Ca2+@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-Ca2+@TA-GF were analyzed, considering gelation time, half-life, film microstructure, and strength. With the addition of 1.6 wt% TA, SA-Ca2+@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-Ca2+@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-Ca2+@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.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…Li et al [25,26] proposed fire extinguishing gels that used methylcellulose as a basic material to achieve high water absorption and temperature sensitivity. Han et al [27] prepared a new biomass gel foam based on sodium alginate, calcium L-lactate, alkyl glycoside, and tea saponin in order to create an environmentally friendly fire prevention and extinguishing material for coal mines. The above new fire extinguishing gels achieved thermal stability, strong inhibition, high water retention, and resilience and could prevent re-ignition after fire extinguishing, thus overcoming the limitations of traditional gels.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characteristics of a pH-Sensitive Sol-Gel Transition Colloid for Coal Fire Extinguishing

Wang

Zheng

et al. 2023

Gels

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Coal fires, most of which are triggered by the spontaneous combustion of coal, cause a huge waste of resources and release poisonous and harmful substances into the environment, seriously threatening the safety of industrial production. Gel flame retardant plays a core role in coal fire prevention and extinguishing. Most gel flame retardants used in coal fires possess good sealing and oxygen isolation properties, but it is difficult for them to flow deep into fire areas due to their low fluidity. Some fire extinguishing agents with good fluidity lack leak-blocking performance. In order to simultaneously improve the fluidity, leakage sealing, and oxygen isolation effects of coal fire extinguishing colloids, a novel, pH-sensitive, sol-gel transition colloid was prepared using low methoxyl pectin (LMP), calcium bentonite (Ca-Bt), sodium bentonite (Na-Bt), and water as the main components. When the initial sol-state colloid absorbed acid gas products from coal combustion, the pH value decreased and a large amount of Ca2+ in Ca-Bt precipitated, thus immediately growing calcium bridges with LMP molecules that formed a three-dimensional network structure for gelation. The optimum ratio of the new colloid was determined through X-ray diffraction, tube inversion, shock shear-temperature scanning, and genetic algorithm. By testing the fire extinguishing performance of the colloid, the findings proved that the product had good oxygen isolation performance, strong adhesion ability, high thermal stability, and strong inhibition effects on coal combustion.

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“…To prevent and control the occurrence and spread of coal mine fires, domestic and foreign scholars have studied different fire prevention and fire-extinguishing technologies to prevent coal spontaneous combustion since the 1950s. For example, measures such as plugging, pressure equalization, water injection, inert gas, grouting, foam injection, ,, gel spraying, and corrosion inhibitor aerosols have been gradually proposed and widely used. The above technical measures have played an important role in the prevention and control of coal spontaneous combustion.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the occurrence frequency and damage degree of spontaneous combustion disasters in deep coal mines are significantly higher than those in shallow mines. − Therefore, it is considered from the aspects of resource conservation, environmental protection, and safe mining. Efficient coal mine fire prevention and extinguishing technical measures to prevent coal spontaneous combustion are imminent. − …”

Section: Introductionmentioning

confidence: 99%

Novel PFA-Based Inorganic Three-Phase Foam for Inhibiting Coal Spontaneous Combustion

Chen

Jia

et al. 2023

ACS Omega

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Fire accidents caused by coal spontaneous combustion usually lead to a large loss of coal resources and casualties. Not only that, the greenhouse effect is polluted while the environment is polluted. At present, the commonly used fire-extinguishing materials such as water, inhibitors, and organic foams have the disadvantages of poor stability and short fire-extinguishing cycles. It is difficult to effectively suppress coal spontaneous combustion and quickly extinguish the fire for a long time. To suppress the spontaneous combustion of coal, the research team proposed an inorganic three-phase foam with a high foam expansion rate, good cohesiveness, and excellent stability. In the formulation, pulverized fly ash (PFA) is used as the matrix, sodium dodecyl benzene sulfonate (SDBS) and α-olefin sulfonate (AOS) are used as foaming agents, curdlan is used as the foam stabilizer, and sodium silicate is the binder. The compound foaming agent with the best performance is optimized, through the two-group compounding test. The composite foaming agent’s optimal compound ratio is SDBS/AOS (3:2). The optimal ratio of inorganic three-phase foam (ITPF) components was obtained through the control variable method experiment. The water–cement ratio is 5:1, the composite foaming agent is 0.2%, the curdlan is 0.5%, and the sodium silicate is 1.6%. In addition, it has been determined by experiments that ITPF has the strongest foaming ability when the pH value is 9 and the temperature is 60 °C. The fire-extinguishing performance of the new material ITPF was investigated by thermogravimetry and coal spontaneous combustion tendency test. It has been observed that the new material has the effect of cooling down and isolating coal from contact with oxygen. The results show that the new material ITPF has the potential to prevent coal spontaneous combustion.

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A novel biomass sodium alginate gel foam to inhibit the spontaneous combustion of coal

Cited by 42 publications

References 54 publications

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

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

Synthesis and Characteristics of a pH-Sensitive Sol-Gel Transition Colloid for Coal Fire Extinguishing

Novel PFA-Based Inorganic Three-Phase Foam for Inhibiting Coal Spontaneous Combustion

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