Abstract
In this study, a steady state model for burning of coal mine methane in a Reverse Flow Burner (RFB) with full kinetics was developed by analogy of a steady counter-flow reactor, and the developed model was used for quick prediction of the lean combustibility limit (LCL). The model was successfully validated with experimental and numerical results, and it was shown that the developed model has excellent accuracy and computational efficiency. Good agreement between the predicted temperature, LCL, and the experiments was observed. The LCL of the equivalence ratio of 0.022 for methane/air mixture was obtained by the developed model. The model was then used to evaluate LCL for the RFB, focusing on the effect of heat loss and burner length on LCL. This indicated that the computational time using the developed model can be reduced by a factor of 1560 compared to the complete transient model.
Highlights
Filtration combustion has attracted much attention due to the enhanced mass and heat transfer process in porous media
A narrow high temperature zone located in the middle of the burner is observed in Figure 3a; this is a typical characteristic of an Reverse Flow Burner (RFB) when the of the burner is observed in Figure 3a; this is a typical characteristic of an RFB when the RFB reaches its steady state at a lower equivalence ratio
A steady state model for an RFB with full kinetics was developed based on analogy steady state reactor
Summary
Filtration combustion has attracted much attention due to the enhanced mass and heat transfer process in porous media. There are three gas streams containing methane from coal—gas drained from the coal seam before mining (60–95%, vol% CH4 ), from work zones of the mine (30–95%, vol% CH4 ) and by ventilation air (0.1–1.0%, vol% CH4 ) [1,2]. Because of the pressure derived from the need to burn coal mine methane and lower emissions in combustion of low heat content gas, new combustion technologies and devices are sought. Of these technologies, superadiabatic combustion has been proven to be an effective way to extend lean combustibility limits (LCLs) and control pollutant emissions compared to conventional combustion [3]
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