Comparison of the inhibition mechanisms of five types of inhibitors on spontaneous coal combustion

Tsai, Yun‐Ting; Yang, Yi; Wang, Caiping; Shu, Chi‐Min; Deng, Jun

doi:10.1002/er.3915

Cited by 57 publications

(14 citation statements)

References 22 publications

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“…CO emission is an important kinetic parameter reflecting coal oxidation reaction. 15,32 Thus, the inhibition rate of CO is used to measure inhibitory effect of inhibitors on CSC.…”

Section: Examination Of the Inhibition Performancementioning

confidence: 99%

Preparation and optimization of thermosensitive hydrogels for inhibiting coal oxidation

et al. 2021

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Currently, the prevention and control of coal spontaneous combustion (CSC) mainly depend on liquid or inert gas injection. In this study, the mixed sol solution was prepared with methylcellulose (MC), polyethylene glycol (PEG), and surfactant sodium dodecyl sulfate (SDS). It has the advantages of in-situ, nontoxicity, easy biodegradation, etc., and can retain a large amount of water by sol-gel transition. The effect of each component on the gel properties was analyzed by using central composite design (CCD) of response surface methodology (RSM). The optimal values of independent variables were 1.99 wt% MC, 6 wt% PEG, and 8 mM/L SDS, under which the response values were obtained as gelation temperature 70 C, gelation time 75 seconds, gel strength 20.32 kPa, and seepage rate 28.51%. The obtained thermosensitive hydrogel (TSH) was characterized by Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). The results showed that the hydrogel was formed by physical cross-linking of MC-PEG-SDS ternary system. The gelation temperature of MC increased in the coexistence of SDS and PEG. The

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“…CO emission is an important kinetic parameter reflecting coal oxidation reaction. 15,32 Thus, the inhibition rate of CO is used to measure inhibitory effect of inhibitors on CSC.…”

Section: Examination Of the Inhibition Performancementioning

confidence: 99%

Preparation and optimization of thermosensitive hydrogels for inhibiting coal oxidation

et al. 2021

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“…Therefore, there is still a huge research gap to be addressed in the fire-fighting field. Deng et al [ 22 ] prepared a linear copolymer P (NIPA-co-SA) hydrogel and established the numerical relationship between the monomer ratio and the critical transition temperature (LCST); Hu et al [ 23 ] prepared a thermosensitive hydrogel by free radical polymerization, and found the volume phase transition temperature of the hydrogel decreased at a higher N-isopropylacrylamide amount; Yu et al [ 24 ] used hydrogel and natural cotton fabric to prepare a new type of fireproof material, which can achieve ideal fireproof performance; Tsai et al [ 25 ] prepared a thermosensitive hydrogel (P(NIPA-co-SA)), and the experimental results showed that the gel has a remarkably inhibitory effect on the spontaneous combustion of anthracite and coking coal; Jiang and Dou [ 26 ] prepared a polyacrylic acid–methacrylamide hydrogel grafted with chitosan (CTS-gP(AA-co-MAA)) by aqueous solution polymerization, and experiments proved it can substantially inhibit the initial oxidation of coal. It is unclear whether the thermosensitive hydrogels can extinguish class A fire effectively or not.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Thermosensitive Hydrogel Used to Extinguish Class A Fire

Huang

Sheng

et al. 2021

Polymers

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Hydrogels are crosslinked polymers that become fully swollen when placed in aqueous environments. They are widely used in the field of firefighting because they can remarkably increase the viscosity and wettability of water. In this study, a thermosensitive hydrogel used to effectively suppress class A fire was synthesized by using methylcellulose, sodium polyacrylate, and magnesium chloride. The structure, surface activity and viscosity of the hydrogel were characterized. Fire extinguishing performance was evaluated based on small-scale and large-scale experiments. The results showed that a phase transition of the hydrogel occurred when the temperature rose from 50 °C to 80 °C. After the phase transition, the hydrogel showed a higher viscosity and lower surface tension, which was conducive to attach to the surface of the burning material and acting as an effective barrier to isolate oxygen. The small-scale fire extinguishing tests indicated that the concentration of the hydrogel solution has an eminent influence on fire extinguishing performance. The optimum concentration for extinguishing performance was around 6 wt%. The large-scale experiments demonstrated that the fire-extinguishing performance of this thermosensitive hydrogel was superior to the two other commercial water-based fire extinguishing agents, as it prevented re-ignition highly efficiently.

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“…However, polymerization is a strong exothermic reaction. If heat generation is too fast or heat remove rate is slower than heat generation, a considerable heat can accumulate in the reaction system, thereby increasing the risk of the thermal runaway reaction, even fire and explosion [ 1 , 2 , 3 , 4 , 5 , 6 ]. Therefore, the thermal hazard of UP mixed with hardeners should be closely studied.…”

Section: Introductionmentioning

confidence: 99%

Thermal Hazard Characteristics of Unsaturated Polyester Resin Mixed with Hardeners

Tsai

2021

Polymers

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Unsaturated polyester resin (UP) is a critical polymer material in applications of many fields, such as the chemical industry, military, and architecture. For improving the mechanical properties, some hardeners, such as methyl ethyl ketone peroxide (MEKPO) or tert-butyl peroxy-2-ethylhexanoate (TBPO), can trigger the curing reaction in UP polymerization, which causes that UP changes the structure from monomer to polymer. However, polymerization is a strong exothermic reaction, which can increase the risk of thermal runaway reaction in UP. Therefore, the mechanisms and characteristics in the thermal runaway reaction of UP mixed with hardeners should be studied for preventing and controlling UP explosion. The thermal hazards of UP mixed with hardeners were determined by thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC) analysis. According to the results, UP mixed with MEKPO exhibited a more violent mass loss and exothermic reaction than UP mixed with TBPO. Furthermore, the thermal runaway reactions of UP mixed with MEKPO or TBPO with different mixing proportions of 1:1, 3:1, and 5:1 were determined. Irrespective of MEKPO or TBPO, the mixing proportions of 3:1 exhibited a high onset temperature and low enthalpy of curing reaction (ΔHexo). This demonstrated that this proportion was safer during UP polymerization. The results of this study can provide useful information for preventing UP explosion and developing polymerization technology.

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Comparison of the inhibition mechanisms of five types of inhibitors on spontaneous coal combustion

Cited by 57 publications

References 22 publications

Preparation and optimization of thermosensitive hydrogels for inhibiting coal oxidation

Preparation and optimization of thermosensitive hydrogels for inhibiting coal oxidation

Experimental Study on Thermosensitive Hydrogel Used to Extinguish Class A Fire

Thermal Hazard Characteristics of Unsaturated Polyester Resin Mixed with Hardeners

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