Process Of Spontaneous Combustion Research Articles

Results of the study of kinetic parameters of spontaneous combustion of coal dust

The article is devoted to the study of the problem of spontaneous combustion of energy grades of coal not only during storage, but also during transportation.
 As the main samples for the study, the energy grades of SS and Zh coals were selected. The main task of the scientific research was to study the rate of cooling and heating of coal depending on their thermophysical parameters and environmental parameters.
 To solve this problem, the authors used both the author's installations designed to study the thermophysical parameters of the spontaneous combustion process (the Ya.S.Kiselev method), and the NETZSCH STA 449 F3 Jupiter synchronous thermal analysis device, the NETZSCH Proteus Termal Analysis software package.
 On the basis of a complex study of the spontaneous combustion process, the authors of the article obtained the kinetic characteristics of the spontaneous heating process (activation energy and pre-exponential multiplier). Nomograms of the permissible size of coal density of different types and shapes of accumulation depending on the ambient temperature are presented, practical recommendations for the prevention (avoidance) of spontaneous combustion of coal fuel are given.

Experimental study on thermal effect and gas release laws of coal-polyurethane cooperative spontaneous combustion

This paper presents a research on the kinetics and gas release laws of the cooperative spontaneous combustion of coal-polyurethane binary system by means of thermogravimetric analysis and spontaneous combustion simulation experiments. The coal-polyurethane binary system is more prone than individual samples to combustion. The polyurethane mass fraction has a great influence on the cooperative spontaneous combustion process. As the polyurethane mass fraction rises, the activation energies of oxygen absorption stage and pyrolysis stage decrease. The combustion residues of coal-polyurethane binary system scorches into lumps and the surfaces of the particles become rougher. During spontaneous combustion, the initial release temperatures of the four gases CO2, CO, C2H6 and C2H4 drop as the polyurethane mass fraction increases. The gas release amount of them increases with increasing polyurethane mass fraction. And the amount of CH4 decreases as the polyurethane mass fraction increases. The CO/CO2 ratio with temperature for different polyurethane mass fraction have the same trends. The results of this study have implications concerning polyurethane materials application and fire protection in coal mine.

The evolution law of functional groups during the heating of coal in oxygen and oxygen‐free atmospheres

AbstractThere is a change in both the quantity and type of functional groups due to the fact that they become oxidized and pyrolyzed during the spontaneous coal combustion process. In order to study the oxidation and pyrolysis mechanisms that are at play during the evolution of these functional groups, in situ Fourier transform infrared (FTIR) spectroscopy was employed to test the real‐time evolution of these functional groups in both air and argon atmospheres. The differences found between functional groups when under an oxygen oxygen‐free environment were analyzed. The results show that when the temperature exceeds 200 °C, the changes in functional groups steadily increase and that regardless of whether the atmosphere is made up of argon or air, the oxygen‐containing functional groups change significantly. In this situation, −OH, −CH3, and −CH2‐ are important reactants in the whole heating process; −COOH and −C=O are reactants during the low temperature oxidation stage, but when reaching the high temperature stage, they become the products; C‐O‐C and C=C is a stable reaction product. During the coal spontaneous combustion process, oxidation and pyrolysis work as two coupling reactions: The heat released by the oxidation reaction pyrolyzes the macromolecular structure and coal‐oxygen complexes, while a large number of active groups are produced during pyrolysis, which then provides the reactants for the oxidation reaction. These results reveal the changes that functional groups go through during the process of oxidation and pyrolysis, and provide a theoretical basis for the development of efficient fire‐fighting materials. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

Emission of gases from coal at low-temperature oxidation depending on the oxygen sorption rate

Coal oxidation by air oxygen can cause a process of spontaneous combustion with intense emission of carbon oxide and danger to initiate explosion of combustible gases. To detect the process of coal spontaneous combustion in mines, they use a gas analysis method providing control of concentrations of carbon oxide, hydrogen and hydrocarbons in the atmosphere. The conducted researches showed that at low-temperature oxidation of coal the intense emission of these gases without temperature increase is possible. Concentration of carbon oxide significantly increases with the growth of coal oxygen sorption rate. Ethylene and carbon dioxide show similar regularities. Acetylene is not found as a result of low-temperature oxidation of coal, and emission of hydrogen, methane, ethane, propane and propylene does not depend on the coal oxygen sorption rate.

Получение гексаферрита бария методом самовозгорания

Until now, the ceramic method remains the most common for synthesis of complex oxides. In this case powders of oxides, carbonates or hydroxides of the required metals are sintered in air or in a controlled atmosphere after thorough mixing. However, it has several disadvantages. The most significant of them is the need to achieve high synthesis temperatures, which leads to an in-crease in the particle size. In addition, due to the latter circumstance, the resulting materials have a low specific surface area, which makes it impossible to use them as catalytic materials. The main advantages of this method are: low cost and availability of initial reagents, no need to use solvents, simplicity of the procedure, and a wide range of materials obtained. The results of ob-taining barium hexaferrite BaFe12O19 by the self-combustion method are presented. During the synthesis, a solution of nitrate salts of the corresponding metals with citric acid was prepared. Af-ter neutralization and evaporation of the solution, the resulting sample was heated in a furnace to carry out the spontaneous combustion process and remove residual carbon. The final sintering was carried out in a tube furnace with a precise temperature controller. The samples obtained were investigated by the powder diffractometry, scanning electron microscopy, X-ray spectral microanalysis, and thermal analysis. It was found that the spontaneous combustion method made it possible to obtain homogeneous barium hexaferrite at a lower temperature (by 200 °C) in comparison with the classical ceramic method. For the synthesized BaFe12O19, the structural parameters are a = 5.891 Å, c = 23.215 Å, V = 697.6 Å3. The used method makes it possible to synthesize promising oxide materials with developed surface under milder conditions, as well as to alloy oxides with highly volatile elements.

Использование метода самовозгорания для получения замещённого алюминием гексаферрита бария

Oxide materials have traditionally attracted the attention of researchers around the world. This is due to their wide range of applications: electrical engineering, electronics, special coatings, chemical technologies, etc. Doping of oxide materials with various elements such as Al, Bi, Zn, Co, Sn, Ti, B, Sb and others is widespread in order to fine-tune their physicochemical properties. In particular, doping of barium hexaferrite with aluminum is of particular interest, since this allows one to change such important parameters as saturation magnetization (σS), coercive force (HC), squareness coefficient of the hysteresis loop (K), as well as to influence the anisotropy field and microwave properties of the material. Since the preparation of BaAlxFe12-xO19 by the classical ceramic method requires thorough grinding of the starting materials, preliminary sintering, high temperature (above 1300 °C) and duration of the synthesis, it was decided to test an alternative method for obtaining aluminum-substituted barium hexaferrite. As such, we have chosen the self-combustion method. During the synthesis a solution of nitrates of the corresponding metals with citric acid was prepared. After neutralization and evaporation of the solution, the resulting mass was heated in a muffle furnace to carry out the spontaneous combustion process and remove residual carbon. The final sintering of samples with the composition BaAlxFe12-xO19 (for x = 0, 1, 2, and 3) was carried out in a muffle furnace with a precision temperature controller at 1100 °C for 4 hours. The obtained samples were studied by the powder diffractometry method, scanning electron microscopy, and X-ray spectral microanalysis. It has been established that the self-ignition method makes it possible to obtain homogeneous samples of barium hexaferrite substituted with aluminum at a lower temperature compared to the classical ceramic method. The parameters of the structure of the obtained samples were also determined. The tested method not only makes it possible to obtain aluminum-substituted barium hexaferrite at lower temperatures, but also makes it possible to dope ferrites with highly volatile elements.

Synergistic Inhibitory Effect of Free Radical Scavenger/Inorganic Salt Compound Inhibitor on Spontaneous Combustion of Coal

ABSTRACT From the aspects of isolating oxygen, lowering temperature and terminating free radical chain reaction, an inorganic salt inhibitor and a radical scavenger were combined to form a compound inhibitor for preventing of coal spontaneous combustion. A long-flame coal with easy self-ignition was chosen to study the inhibitory performance of different inhibitors using inhibition performance tests and by characterizing reactive functional groups and performing thermal analysis. The experimental results show that the compound inhibitor has a coordinated inhibitory effect throughout the whole process of coal spontaneous combustion, with physical and chemical double inhibition effect. Compared with the raw coal, the amount of CO released from the coal sample treated by the compound inhibitor was reduced by 88.7% at 128°C, and the inhibition rate reached 82.5% at 100°C. The inhibition ratio is higher than 80% during the initial weight loss stage and the oxygen absorption and weight increase stage. The compound inhibitor plays an inhibitory role by reducing the contents of hydroxyl, methyl, methylene groups and active components containing carbonyl groups in the coal, wherein, the relative content of a carbonyl compounds decreased obviously. During the initial weight loss stage, the water retention due to inorganic salts physically isolated oxygen and cooled the coal. During the oxygen adsorption and mass gain stage, free radicals were released from the compound inhibitor and captured both oxygen free radicals and carbon free radicals via chemical inhibition. N,N-Dibenzylhydroxylamine (DBHA) contains multiple absorption sites that can simultaneously capture multiple free radicals in coal. Butylated hydroxyl toluene (BHT) reacts with free oxygen-containing functional groups to form stable compounds, which interrupts the formation paths for ketones and aldehydes. Moreover, the inhibition mechanism of the compound inhibitor on coal spontaneous combustion was also explored.

Numerical investigation on the gas and temperature evolutions during the spontaneous combustion of coal in a large-scale furnace

To understand the development of coal oxidation reaction, the process of coal spontaneous combustion in a large-scale furnace was numerically simulated by employing finite element method and further validated through experiments. The evolutions of oxygen volume fraction and temperature distributions in the furnace were obtained. Furthermore, the influences of air supply volume and the thermal boundary temperature on carbon monoxide productions and maximum temperature changes were investigated. It was found that the released gaseous products and oxygen consumptions of the coal-oxygen reaction increased slowly before 60 °C, and rapidly after exceeding 100 °C. The low oxygen volume fraction region was generated away from the air inlet and moved towards the air inlet. The movement of high-temperature spots in the furnace could be divided into heat storage stage, thermal stability stage and rapid oxygen consumption stage. With the acceleration of coal-oxygen reaction, the region of high-temperature spot first moved away from the air inlet, and then migrated towards the air inlet. In addition, the higher volume of air supply and thermal boundary temperature could promote coal-oxygen reactions and cause thermal runaway when the critical values were reached. This study is helpful for the prevention of the coal spontaneous combustion.

Prediction of temperature and CO concentration fields based on BPNN in low-temperature coal oxidation

To prevent coal spontaneous combustion, it is critical to accurately simulate and predict the low-temperature oxidation process of coal. In this study, an experiment system was constructed to investigate the temperature and gas concentration of two typical coals during low temperature oxidation. The back propagation neural network (BPNN) was proposed to simulate this process under six factors, including activation energy, void fraction, moisture content, air flow rate, stacking time and location of measuring point. The average relative error of oxygen concentration, temperature and CO concentration are 1.34 %, 1.09 % and 1.15 %, respectively. Besides, the statistical performance indicators are precise. Most importantly, the predicted temperature and gas concentration fields can be utilized to analyze coal spontaneous combustion process which allows us to track down the crucial factors on spontaneous combustion. By applying our BPNN modeling method, the odds of coal spontaneous combustion can be lowered.

The graded warning method of coal spontaneous combustion in Tangjiahui Mine

The accurate prediction of the degree of coal spontaneous combustion is critical for the prevention and control of spontaneous combustion in coal mines. However, the qualitative three-stage classification method is difficult to meet the demand for accurate early warning of coal spontaneous combustion. Therefore, with long-flame coal in the Tangjiahui Mine as the study object, this paper conducted the temperature-programed coal spontaneous combustion experiment and the coal spontaneous combustion experiment. The parameters that were measured were O2 concentration and gas generation volume during the process of coal spontaneous combustion under different oxygen supply conditions. Furthermore, this study analyzed the characteristics of gas and gas ratio variation with coal temperature, screened out the characteristic gas indexes of coal spontaneous combustion in Tangjiahui Mine, and defined six characteristic temperatures and their threshold values. Accordingly, the coal spontaneous combustion process was divided into seven stages, including the latent stage, recombination stage, self-heating stage, activation stage, thermal decomposition stage, fission stage, and combustion stage. We provide the early warning criteria and the threshold values of characteristic gas parameters at each stage and define the names of graded warnings, such as gray, blue, yellow, orange, red, and black. With this warning method, we successfully forecasted the degree of coal spontaneous combustion in the gob of the 61,102 working face, guaranteeing the successful withdrawal of this working face.

Distribution law for the danger area for spontaneous coal combustion in a dynamic goaf with low air leakage speed

This paper examines the relationship between the advancement of the working face and the distribution of spontaneous coal combustion under a low air leakage wind speed in a goaf. Based on the unsteady-state simulation method, the process of spontaneous coal combustion was simulated in a fully mechanized coal mining face at different advancing speeds. The relationship between different advancing speeds and the distribution area of the oxidation zone of spontaneous coal combustion in a goaf was clarified. A safe advancing speed was determined. Furthermore, the advancement of the working face altered the area of spontaneous high temperature inside the goaf. An increase in the advancing speed increased the length of time of spontaneous combustion in the leftover coal. An exponential relationship was demonstrated between the spontaneous combustion area and the advancement of the fully mechanized mining face. When the oxygen concentration was used as a calculation indicator, the width of the oxidation zone was asymmetrical on the inlet and outlet, and the advancing distance of the working surface increased when the distance was shorter than 90 m and the return side was smaller than the inlet side. When the advancing distance was longer than 90 m, the width of the spontaneous combustion oxidation zone distribution remained unchanged. The study clarified the relationship between the distribution of the danger area for spontaneous coal combustion and advancing speed. This could provide a theoretical basis for the prevention and control technology of the spontaneous combustion of broken coal in a dynamic goaf.

Experimental study on the spatial and temporal variations of temperature and indicator gases during coal spontaneous combustion

Coal spontaneous combustion is one of the main potential hazards in the process of mining. To study the spatial and temporal variations of higher-temperature area and indicator gases, an adiabatic oxidation testing system was developed to simulate the whole process of coal spontaneous combustion. The experimental results show that the entire process of coal spontaneous combustion could be divided into three stages: slow-oxidation, accelerated-oxidation and combustion stages. In the slow-oxidation stage, the higher-temperature area shifted slowly from the bottom to the top and then stayed at the top until accelerated-oxidation stage was reached; [Formula: see text] and [Formula: see text] concentration remained more or less constant as well as the oxygen concentration. In accelerated-oxidation stage, the higher-temperature area moved to the bottom rapidly and subsequently stayed approximately in the center of the coal; [Formula: see text], [Formula: see text] concentration and oxygen consumption increased sharply. In addition, the occurrence of higher-temperature area is accompanied by higher oxygen consumption. The obtained results show that higher air supply rate could shorten spontaneous combustion period and there exists a hyperbolic relationship between the temperature and time.

Experiment and Field Application of Inhibitior Liquid in Spontaneous Combustion Process of Coal Based on Thermogravimetric Analysis

Abstract An effective way to slow down the process of coal spontaneous combustion (CSC) is by injecting inhibitor liquid into the coal body. Research on inhibitors has achieved good effects, but many have occurred only under laboratory conditions; for applications in actual underground coal mines, there may be many limitations. In this paper, MgCl2, CaCl2, and NH4H2PO4 are selected, and they are prepared as inhibitor liquids and injected into coal samples from three coal mines to obtain inhibitor coal samples. Industrial analysis (IA) and thermogravimetric analysis (TGA) of raw and inhibitor coal samples were carried out under laboratory conditions. Finally, MgCl2 was selected as the inhibitor to carry out a field test in a coal mine working face. The results show that the volatile content, fixed carbon content, and calorific value decrease and the ash content increases after injection of the inhibitor. NH4H2PO4 has the greatest influence on coal, which is more obvious in the Nantun coal samples. MgCl2 and CaCl2 have stronger inhibitory effects in the temperature range of 0–200 °C, and the inhibitory effects decrease in the high-temperature stage. This is due to the evaporation of water and the loss of active components under high temperature. The inhibitory effect of NH4H2PO4 at high temperature is stronger than those of MgCl2 and CaCl2. The CO concentration was significantly reduced after injection of the inhibitor liquid in an underground field, which delays the oxidation process of coal for approximately 10 days and greatly reduces the risk of CSC.

Thermodynamic Model and Kinetic Compensation Effect of Spontaneous Combustion of Sulfur Concentrates

The spontaneous combustion of the sulfur concentrate is the main hazard faced in ore storage bins. To understand the thermodynamic characteristics of spontaneous combustion of the sulfur concentrate and test whether the kinetic compensation effects are present in the spontaneous combustion process of the sulfur concentrate, typical sulfur concentrate samples were selected as the research object, and thermogravimetric experiments were carried out under an air atmosphere at heating rates of 5, 10, and 15 K/min. On this basis, the contributions of different reaction models to the mass change during the spontaneous combustion of the sulfur concentrate, as well as the thermodynamic model and kinetic compensation effect, are analyzed. The results show that solid-phase combustion contributes the most to mass loss among different mechanisms of the reaction between the sulfur concentrate and oxygen. The contributions of reaction models to mass loss are affected by the different heating rates, and the contribution of solid-phase combustion to mass loss increases with increasing heating rates. The Malek method is used to obtain the kinetic model of the spontaneous combustion of the sulfur concentrate, and its mechanism function changes from a chemical reaction model to a three-dimensional diffusion model. There is a kinetic compensation effect in the spontaneous combustion process of the sulfur concentrate, and the level of the kinetic compensation line may be one of the bases for distinguishing the spontaneous combustion tendency of the sulfur concentrate.

Effects of FeS2 on the process of coal spontaneous combustion at low temperatures

Spontaneous combustion of coal has become an important disaster that threatens the safety of coal mines. FeS2 is the main component of pyrite, which is suspected to be a major contributor to coal spontaneous combustion (CSC). So, it has important significance to FeS2 on the characteristics of coal oxidation for prevention and treatment. This study used coal samples mixed with different proportions of FeS2 (2.0 mass%, 4.0 mass%, and 6.0 mass% mass percentage) were tested to investigate the characteristics of spontaneous combustion, as compared with the fresh sample. The CO and CO2 production rates, critical temperature, and dry cracking temperature during oxidation were analyzed. The temperature-programmed experiments was conducted to simulate low-temperature oxidation processes realistically. In-situ infrared spectroscopy was used to appraise the evolution of low-temperature (< 200.0°C) oxidation of aromatic hydrocarbons, aliphatic hydrocarbons, and oxygen-containing functional groups on the surfaces of the samples. Experimental results showed that FeS2 exhibited a strong influence as the temperature exceeded the dry cracking temperature. Adding 2.0 mass% and 4.0 mass% FeS2 showed a promoting effect on low-temperature oxidation; however, FeS2 became an inhibitor which reached 6.0 mass%. Furthermore, adding 2.0 mass% FeS2 showed the strongest promoting effect. From a microscale perspective, the promoting effect of FeS2 on coal oxidation was due to thermal release from FeS2 oxidation, enhancing the reaction between aliphatic hydrocarbons, such as methyl groups and methylene, and oxygen. Due to the reaction of FeS2, the acidic environment was conducive to the hydrolyzation of lipid structures into highly active alcohol or phenol structures, which in turn promoted the oxidation of the coal sample. These results are crucial for understanding the mechanism underlying the influence of FeS2 on CSC and mine safety protocols.

Heat Release Characteristic of Key Functional Groups during Low-Temperature Oxidation of Coal

ABSTRACT Coal spontaneous combustion involves the process of functional group distribution and heat accumulation in coal. Therefore, analyzing the thermal reaction process of coal spontaneous combustion and the law of thermal effect generation to determine the key reaction links and functional groups and reveal the mechanism of coal spontaneous combustion is of great significance for the development of relevant control technology and materials. Three weakly caking coal samples were collected from the Chao Yuan, Huang Ling, and Hei Lapan coal mines in the Shaanxi Province of China. The characteristic heat release parameters of the weakly caking coal during low-temperature oxidation were analyzed using a micro-calorimeter (C80) and Fourier transform infrared spectroscopy (FTIR). A correlation analysis between the heat release rate and functional groups was carried out by the Pearson correlation coefficient method. The results showed that the low-temperature oxidation process of coal has obvious in stages and characteristics. Furthermore, while the heat release rate is influenced by the reaction of the functional groups in the coal molecular structure, the different functional groups exhibit different effects on the oxidation. The formation and consumption of hydroxyl, carbonyl, carboxyl, and various substituted aromatic hydrocarbons were observed to play a crucial role in low-temperature oxidation.

Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action

It is imperative to have an in-depth understanding of the effect of extraneous moisture on the spontaneous combustion of coal not only for the control and prevention of coal spontaneous combustion in the coal mining industry, but also for the optimization design and application of the technological process. In this study, the type of moisture in a coal body has been redefined for the first time from the perspective of disaster prevention and control, i.e., original occurrence of moisture in the coal matrix and the extraneous moisture from the technological process. A suit of coal bodies with different extraneous moisture was prepared by soaking long-flame coal with a low water content. Using a temperature-programmed oxidation test, the effects of extraneous moisture on the temperature increase rate of coal bodies and the emission characteristics of gaseous products during coal spontaneous combustion were studied. Moreover, combined with the characterization of thermal analysis and of pore structure test, the action the mechanism of extraneous moisture on the coal spontaneous combustion process was also explored. The experimental results indicated that the effect of the extraneous moisture content varied with the development of coal spontaneous combustion. In the slow oxidation stage, extraneous moisture played a physical inhibition role in the coal oxidation. In the accelerated oxidation stage, extraneous moisture exhibited a catalytic effect on the coal–oxygen reaction or directly participated in the reaction. After entering the rapid oxidation stage, a delayed effect appeared. When the coal temperature exceeded 180 °C, the spontaneous combustion characteristics of coals with different initial moisture contents gradually tended to achieved balance.

Research on free radical variation law in spontaneous combustion and oxidation process of coal gangue

Research on free radical variation law in spontaneous combustion and oxidation process of coal gangue

Study of resource utilization and fire prevention characteristics of a novel gel formulated from coal mine sludge (MS)

In order to utilize coal mine sludge (MS) and reduce material cost, this paper reports the preparation method of a novel MS/CMC-Al3+ fire prevention and extinguishing material by mixing MS with sodium carboxymethyl cellulose (CMC), polyaluminium chloride, and citric acid. The experimental results indicate that with MS: CMC: AlCit (aluminum citrate): H2O = 15:1:4:35, MS/CMC-Al3+ gel displayed the best compressive strength and inhibitory effect. The combination of Raman spectroscopy and FTIR spectroscopy showed that HPAM-Al3+/Fe3+ gel in MS and CMC form a strong chelation force between ions. SEM analysis showed that the surface structure of MS/CMC-Al3+ gel was extremely dense and MS, CMC, Al3+, and Fe3+ were evenly distributed in the composite colloid, suggesting that HPAM-Al3+/Fe3+ gel and CMC were completely crosslinked. By analyzing the oxidation characteristics of MS/CMC-Al3+ gel via TG-IR, it was found that MS/CMC-Al3+ gel can effectively inhibit the increase in coal temperature and heat accumulation, which is beneficial for spontaneous combustion process of coal. Simultaneously, MS/CMC-Al3+ gel can also inhibit the generation of CO and CO2 from combustion, which plays a significant inhibitory role. MS/CMC-Al3+ gel reduces pollution and cost by the recycling of wastes; hence, it is a clean fire protection and extinguishing material.

Numerical evaluation of inclined heat pipes on suppressing spontaneous coal combustion

Suppressing spontaneous coal combustion with heat pipe (HP) is an effect fire fighting method in practice. To improve the heat transfer capacity of HPs in coal piles as much as possible, this work explores the optimal inclination angle of HPs to remove heat in the coal stockpiles. Based on the theory of fluid mechanics and heat transfer, a physical-mathematical model of coal-HP-air was established, and the spontaneous combustion process of coal piles and the effect of HPs at four inclination angles (θ) of 30°, 45°, 60°, and 90° on the spontaneous combustion of coal piles were studied. The results show that the presence of HPs can change the heat conduction path in a coal pile and help the coal pile to dissipate heat in time, and this process makes the temperature contours on both the windward side and the leeward side deform and exhibits a ‘saddle’-like cooling mode at the periphery of the HPs. As θ of the HPs increases, the area (ΔS) by which the spontaneous combustion danger zone (SCDZ) is decreased first increases and then decreases, and the maximum temperature (Tmax) drop values (ΔT) first increases and then decreases. Moreover, the thermal performance of the HPs at inclination angle of 60° is found to be higher than other tested inclination angles. When θ = 60°, the heat is largely removed, and the integrity of the SCDZ is destroyed, so that ΔS is 11.106 m2, ΔT is 13.1 °C, and the natural ignition period is extended by approximately 25 days. Consequently, this study provides a reference for the design and optimization of coal fire fighting engineering with HP application in the future.