Reaction mechanism and thermodynamics of the elimination of peroxy radicals by an antioxidant enzyme inhibitor complex

Lü, Yi; Xi, Zhilin; Jin, BangXin; Li, Meitong; Ren, Changxing

doi:10.1016/j.fuel.2020.117719

Cited by 21 publications

(12 citation statements)

References 44 publications

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“…These hydroxyl groups can be combined with the hydroxyl groups (R-OH) with a higher oxidation activity in coal to form relatively stable ether bonds (R–O–R). 42 , 43 Thereby, the stability of the coal molecular structure is improved and the oxidation reaction of the coal is inhibited. As the temperature rises, the gel will gradually crack and lose the function of oxygen barrier and water retention.…”

Section: Resultsmentioning

confidence: 99%

Characterization and Performance Testing of an Intumescent Nanoinhibitor for Inhibiting Coal Spontaneous Combustion

et al. 2022

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Considering disadvantages such as the low thermal stability and environmental pollution of existing gel inhibitors, a green and stable intumescent nanoinhibitor (INI) was prepared and tested. First, polyacrylamide (PAM), nano-silica, and intumescent flame retardant (IFR) were selected as raw materials. The INI was prepared by nanoparticle modification and cross-linking polymerization. Then, the structure and physical properties of INI were tested by Fourier transform infrared spectroscopy, scanning electron microscopy, and rheological experiments. Meanwhile, the inhibition performance of INI was studied through thermogravimetric analysis-Fourier transfer infrared spectroscopy (TGA-FTIR) analysis. The results suggest that the nanomodification improved the dispersibility of INI particles. The addition of modified nano-silica (MNS) and IFR enhances the strength of the reticular structure, thereby improving the transport convenience and covering ability of the INI gel. At high temperatures, IFR can generate a porous foamed carbon layer that further coats the coal. After INI inhibition treatment, the characteristic temperature and activation energy of coal were significantly improved, and the production of carbon monoxide and carbon dioxide decreased. Hence, irrespective of physical properties, physical inhibition performance, or chemical inhibition performance, INI performed well. Research results can provide valuable references for the preparation and performance study of a coal spontaneous combustion inhibitor.

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Section: Resultsmentioning

confidence: 99%

Characterization and Performance Testing of an Intumescent Nanoinhibitor for Inhibiting Coal Spontaneous Combustion

et al. 2022

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“…The CPSF could be adsorbed on the coal surface to separate the coal from oxygen and prevent further reaction of the coal because of its good viscosity and fluidity. The CPSF contains carboxyl and hydroxyl, which can combine with the active free radicals and oxides in coal, thus reducing the active transmitter and blocking the free radical chain reaction . Furthermore, even if the foam cells are ruptured, FA particles could still be filled in the seam of the coal, forming a protective film with SA to prevent further oxidation of the coal.…”

Section: Results and Analysismentioning

confidence: 99%

“…The CPSF contains carboxyl and hydroxyl, which can combine with the active free radicals and oxides in coal, thus reducing the active transmitter and blocking the free radical chain reaction. 38 Furthermore, even if the foam cells are ruptured, FA particles could still be filled in the seam of the coal, forming a protective film with SA to prevent further oxidation of the coal. In conclusion, the CPSF reduces the high temperature of the coal, separates the coal and oxygen, inhibits the oxidation activity of the coal, and prolongs the coal spontaneous combustion period.…”

Section: Results and Analysismentioning

confidence: 99%

Colloidal Particle-Stabilized Foam To Control the Coal Spontaneous Combustion: Stability Mechanism Analysis and Extinguishing Properties

et al. 2020

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The stable gel suspensions (SGS) were prepared by using sodium alginate (SA) and fly ash (FA) to form a wide network structure in solution, and the suspension mechanism was analyzed. According to the mechanism of suspension, a large number of SA molecules gathered on the surface of FA particles due to chelation, which made FA particles evenly dispersed in the solution. Then the colloidal particle-stabilized foam (CPSF) was prepared by a certain amount of the SGS and aqueous foam. The effects of different foam-expansion ratios on the half-life time and viscosity of the CPSF were investigated. The foam stability showed that the half-life time of the CPSF changed significantly with the increase of the foam-expansion ratio. Considering a foam half-life time >20 h, the effective foam-expansion ratio range of CPSF was determined as 4.51−7.06. A higher foam-expansion ratio resulted in a poorer viscosity of the foaming solution. Meanwhile, the shear-thinning characteristics were more significant. The results of fireextinguishing experiments and accelerated oxidation experiments indicated that the CPSF could be well-attached to the surface of coal particles, effectively increase the CPT of coal samples, delay the appearance time of CO significantly, reduce the generation of CO rapidly, and show good inhibition performance.

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“…These studies can offer a good basis for delineation of the danger area of the spontaneous coal combustion in the regenerated roof. As a result of the randomness of the temperature rise in the goaf, the poor thermal conductivity of the coal and rock mass, and the limitations of the existing hidden fire source temperature measurement technologies in the goaf, it remains a mainstream research goal to infer the degree of spontaneous coal combustion by monitoring the gas in the goaf. , Thus, the main research methods for delineation of the spontaneous combustion danger area of coal focus on numerical calculation and computational fluid dynamics (CFD) simulation. In this paper, a physical model is built to carry out numerical simulation, the measurement points are arranged on site for analysis and verification, and the danger area of spontaneous coal combustion is comprehensively analyzed on the basis of the oxygen concentration and air leakage velocity.…”

Section: Introductionmentioning

confidence: 99%

Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

et al. 2020

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Spontaneous coal combustion in a regenerated roof is difficult to find, and the awareness of prevention is relatively weak. To effectively delineate the range of the danger area, the characteristic parameters of spontaneous coal combustion were tested. The result shows that carbon monoxide (CO) was chosen as the index gas, and the relationship between the oxygen consumption rate and oxygen concentration was fitted linearly. Mathematical models of the air speed field and oxygen concentration field were derived, and a physical model of the regenerated roof was established. On the basis of COMSOL Multiphysics simulation, the test value and predicted value of air speed and oxygen concentration were compared with good similarity. The danger area of spontaneous coal combustion was determined by the two indices of oxygen concentration and air speed with ranges of 1.35–6 and 0.60–3.02 m, respectively. A polyacrylamide–particle-stabilized foam (PPSF) with an average pore size of 165 μm and pore wall thickness of 30.5 μm was prepared in batch mode using a homemade foam-generating device. Optical microstructure characterization showed that the mixed powder can be distributed evenly in the liquid film and that polyacrylamide as a vesicular liquid membrane carrier presented a network structure. The formation mechanism of the foam was presented in a schematic diagram. The PPSF was injected into the delineated danger area of 350 m3, and the temperature and concentration of CO decreased to 32 and 29 °C and 5 and 22 ppm, respectively. All of these results indicated that PPSF can effectively inhibit spontaneous coal combustion in the regenerated roof.

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Reaction mechanism and thermodynamics of the elimination of peroxy radicals by an antioxidant enzyme inhibitor complex

Cited by 21 publications

References 44 publications

Characterization and Performance Testing of an Intumescent Nanoinhibitor for Inhibiting Coal Spontaneous Combustion

Characterization and Performance Testing of an Intumescent Nanoinhibitor for Inhibiting Coal Spontaneous Combustion

Colloidal Particle-Stabilized Foam To Control the Coal Spontaneous Combustion: Stability Mechanism Analysis and Extinguishing Properties

Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

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