Improved prediction model for H2/CO combustion risk using a calculated non-adiabatic flame temperature model

Kim, Yeon Soo; Jeon, Joongoo; Song, Chang Hyun; Kim, Sung Joong

doi:10.1016/j.net.2020.07.040

Cited by 20 publications

(6 citation statements)

References 32 publications

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“…The relative errors between the simulated and experimental values for the flame temperature and radiation intensity were 16.94% and 9.54%, respectively. These errors meet the requirements of industrial applications [20], thus confirming the feasibility and accuracy of the simulation method. In order to simulate different operating conditions, five sets of experiments were designed with methane volumetric flow rates of 0.4 m 3 /h, 1.2 m 3 /h, 2.0 m 3 /h, 2.8 m 3 /h, and 3.6 m 3 /h as Table 1 shows.…”

Section: Model Verificationsupporting

confidence: 71%

Gas-Flow-Rate Inversion Based on Experiments and Simulation of Flame Combustion Characteristics in a Drilling Blowout

Zhang,

Liu,

Huang

et al. 2024

Processes

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Accurately estimating the gas-flow rate at a wellhead to invert the formation pressure and production capacity information can be the basis for subsequent well-killing parameter design following oil and gas-well drilling blowout and ignition. Based on the multicomponent characteristics of the blowout gas and the turbulence intensity of the blowout flame, as well as the effects of complex factors such as environmental wind direction, wind speed, and wellhead structure, a numerical model for actual drilling blowout ignition is established. Jet-flame experiments are conducted under blowout conditions to verify the accuracy of the model. The temperature and radiation fields and flame morphologies of the well jet flow flame under different lateral wind speeds, well jet flow rates, and wellhead diameters are analyzed. Previous studies have found that as the lateral wind speed increases, the maximum temperature and maximum thermal radiation intensity of the blowout flame first decrease and then increase. However, as the amount of well jet increases, although the flame influence area increases, the maximum temperature does not increase significantly, and the maximum thermal radiation intensity actually decreases. Based on experimental and numerical simulation datasets, a high-yield gas-well jet volume prediction method based on the flame height and thermal radiation intensity of the well jet flow is constructed, which has important engineering application value for achieving successful well killing following well jet ignition.

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Section: Model Verificationsupporting

confidence: 71%

Gas-Flow-Rate Inversion Based on Experiments and Simulation of Flame Combustion Characteristics in a Drilling Blowout

Zhang,

Liu,

Huang

et al. 2024

Processes

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“…They also confirmed that the CFT model predicts the lower flammability limit of steam-containing hydrogen mixtures from the thermal emissivity near the limit. Kim et al proposed an improved prediction model for the combustion hazard of hydrogen/carbon monoxide using a computational flame temperature model considering heat loss. They also confirmed that the CFT model predicts the lower flammability limit of steam-containing hydrogen mixtures from the thermal emissivity near the limit …”

Section: Advances In the Prediction Model Of Flammability Limits Of C...mentioning

confidence: 99%

“…where c is the coefficient obtained from the experimental measurement, c = 0.0854. Catoire et al 196 proposed an equation for estimating the lower flammability limit of pure combustible gases in the 25− Table 5 58 Babrauskas, 155 Bodurtha, 156 and Vanderstraeten et al 82 instead of relying on the theory of combustible ignition, flame propagation, and flame extinction, they both build black box models by fitting experimental data heat balance theory CAFT method Benedetto, 157 Mashuga et al, 158 Shebeko et al, 159 Rowley et al, 160 Vidal et al, 161,162 Qin et al, 163 Chen et al, 164,165 Shu et al, 166,167 Li et al, 168 Hu et al, 169 Palucis et al, 170 Wu et al, 171 Bounaceur et al, 172 Wan et al, 173−176 and Mendiburu et al 177−180 this method is unsuitable for estimating the upper limits of flammability because it is difficult to calculate the heat capacity of unburned fuel precisely CFT method Zhao et al, 181 Liaw et al, 182 Kim et al, 30 and Jeon et al 31 flame propagation and heat dissipation theory burn rate method Law et al, 183 Wang et al, 184 where X is the mole fraction of fuel in the corresponding stoichiometric fuel/air mixture, n is the number of carbon atoms in the molecule, and T is the temperature (K).…”

Section: Advances In the Prediction Model Of Flammability Limits Of C...mentioning

confidence: 99%

“…The flammability limits of many flammable gases have been evaluated at ambient temperature and pressure. , However, the flammability limits are affected by the initial temperature, initial pressure, inert medium or impurity gas, , explosion container and shape, ignition energy and position, turbulent flow state, and other environmental factors operating methods. , Many processes are run at elevated temperatures and pressures in current industries, such as the air injection process, − high-temperature reaction process in the chemical industry, − fuel cell or internal combustion engine, waste gas treatment in the metallurgical industry, core melting accidents of nuclear power plants, , and fire accidents. Existing studies have shown that many factors must be considered at high temperatures and pressures, resulting in difficulties in experiments and measurements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flammability Limits of Combustible Gases at Elevated Temperatures and Pressures: Recent Advances and Future Perspectives

Yan

Wang

et al. 2022

Energy Fuels

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The flammability limits are essential parameters that reflect the risk of a gas explosion and are affected by the temperature, pressure, and inert gas. Many industrial processes are run at high temperatures and high pressures. Incidents involving combustible gas explosions are frequent; however, issues with gas explosion safety at high temperatures and pressures are never addressed. There have been no substantial advances in theoretical prediction for a long time and a dearth of perfect theories and systematic data collection. Many factors, such as thermal decomposition and slow oxidation, need to be considered at high temperatures and high pressures, which causes difficulties in measurements and inadvertently increases the potential explosion risk. This paper reviews the historical experimental research on the flammability limit of combustible gases at elevated temperatures and pressures and the prediction model of flammable limits by examining the influence mechanism of high temperatures and high pressures. An overview of the theory of flammability limits, criterion of flammability limits, experimental studies, and current status of flammability limit prediction models for combustible gases at high temperatures and pressures are highlighted to help establish and improve the accuracy of flammability limit prediction models at high temperatures and pressures.

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“…The prediction shows lower accuracy and conservative results, especially for specific mixtures. 18 The application of the flame temperature, which is equivalent to such a minimum temperature, in the energy balance explains the flammability limits. 19 To further understand the LFLs of fuel mixtures, this paper tested the lower explosion limit of the ternary mixtures of methane-ethylene-propane and compared it with the prediction of the empirical formula of Le Chatelier's law.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement and theoretical prediction for lower flammability limits of ternary hydrocarbon mixtures

Ning

et al. 2022

Process Safety Progress

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The present work experimentally investigated the lower flammability limits of methane-ethylene-propane-air mixtures at ambient temperature and pressure in a 20 L confined chamber. Moreover, a calculated flame temperature (CFT) modeling for predicting the lower flammability limit of multicomponent mixed combustible gas was proposed based on the law of conservation of energy. The results indicated that the relative error of Le Chatelier's law is 2.88% in the prediction of the lower flammability limit of the tested multicomponent mixed combustible medium. Also, the relative error of CFT modeling is only 1.47%, which is reduced by 48.96% and can significantly improve the prediction accuracy of the lower flammability limit of multicomponent mixtures. Furthermore, using the premixed laminar flame speed reactor, the USC 2.0 mechanism was employed to obtain the behavior of ternary hydrocarbon mixtures near the flammability limits. The sensitivity analysis showed that competition between the chain branching reaction R1 (H + O 2 ⟺ O + OH) and the chain termination reaction R12 (H + CH 3 (+M) ⟺ CH 4 (+M)) was crucial in determining the lower flammable limit.

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Improved prediction model for H2/CO combustion risk using a calculated non-adiabatic flame temperature model

Cited by 20 publications

References 32 publications

Gas-Flow-Rate Inversion Based on Experiments and Simulation of Flame Combustion Characteristics in a Drilling Blowout

Gas-Flow-Rate Inversion Based on Experiments and Simulation of Flame Combustion Characteristics in a Drilling Blowout

Flammability Limits of Combustible Gases at Elevated Temperatures and Pressures: Recent Advances and Future Perspectives

Experimental measurement and theoretical prediction for lower flammability limits of ternary hydrocarbon mixtures

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