Abstract
The Fluent computational fluid dynamics software was used to study the relevant factors affecting the maximum commutation half cycle for thermal countercurrent oxidation of low-concentration gas in coal mine ventilation. Based on orthogonal experiments, the maximum commutation half cycle for thermal countercurrent oxidation of the exhaust gas in the coal mine ventilation under 25 working conditions with the combination of different methane concentrations, inlet speeds, porosities, and oxidation bed filling lengths is investigated. SPSS data processing software was used to perform regression analysis on the numerical simulation data, and a mathematical model for predicting the maximum commutation half cycle under the influence of four factors was obtained. Through experiments, the mathematical model of the maximum commutation half cycle by the numerical simulation was verified. After introducing the wall heat loss correction coefficient, the complete prediction model of the maximum commutation half cycle was obtained. Comparing the experimental test value with the calculated value using the corrected model, the relative error was not more than 3%. The complete mathematical model corrected can be applied to the design calculation of the maximum commutation half cycle for thermal countercurrent oxidation of low-concentration gas in actual coal mine ventilation.
Highlights
Coal is a fossil energy source which provides about 30% of the total energy consumption in the world [1,2,3]
According to the theory of orthogonal test, each factor was averaged at the same level to obtain the comprehensive average value of each factor at the same level. en, the difference between the maximum value and the minimum value among the average values of different levels of each factor was calculated to obtain the range (r) of each influencing factor. e range value can reflect the significance of the influence of the factor on the result. e larger the range value, the greater the difference in the level of the factor and the more important the factor. rough the range analysis, the influences of each factor on the different maximum commutation half cycle of thermal countercurrent oxidation can be derived
From the results of the numerical simulation analysis, it can be seen that the maximum commutation half cycle was closely related to the methane concentration of ventilation gas, the inlet velocity, the porosity of the honeycomb ceramic, and the filling length of the oxidation bed
Summary
Coal is a fossil energy source which provides about 30% of the total energy consumption in the world [1,2,3]. Thermal countercurrent oxidation is one of the main technologies to achieve the reduction in low-concentration gas emission and rational utilization of coal mine ventilation. En, the obtained mathematical model was verified by the experiment of thermal countercurrent oxidation of low-concentration gas in coal mine ventilation, and the wall heat loss coefficient was introduced to correct the model. A complete prediction model of the maximum commutation half cycle was obtained, which can provide theoretical guidance for the design and operation of thermal countercurrent oxidation units for low-concentration gas in coal mine ventilation
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