Shuxia Mei

Numerical Simulation in Combustion Space of an Oil Fired Oxy-Fuel Glass Furnace with Different Burner Arrangements

In this paper, an oil fired oxy-fuel glass furnace was designed, and the numerical simulation in the combustion space of the furnace was carried out. The optimization approach was proposed by comparing two different burner arrangements, opposed and staggered one respectively. The gas phase was expressed with k-e two-equation model; the oil drop motion was described with Discrete Phase Model; the combustion was described with non-premixed model; the radiation was expressed with discrete ordinates radiation model. The simulation results agree well with the related references. The results show that for the design furnace in this study, it is appropriate to arrange the burners in staggered manner, since in this case the temperature is uniform, and the flow field under the crown is gentle, and also the heat transfer rate to the liquid glass surface is higher. Keywords-oxy-fuel combustion; combustion space; numerical simulation; burner arrangements; opposed; staggered I. INTRODUCTION

Numerical Simulation of Gas-solid Flow and Pulverized Coal Combustion in a Swirl Chamber Precalciner

Efficient mixing of pulverized coal and calcium carbonate particles inside precalciner is important due to the reason that the mix process directly affects the final coal burn-out ratio and calcium carbonate decomposition ratio. The focus of this paper is on the gas-solid flow and pulverized coal combustion in an in-line swirl chamber precalciner. In terms of commercial computational fluid dynamics (CFD) code, the gas-solid flow characteristics, the temperature distribution and components distribution were obtained by numerical simulation of a 5000t/d swirl chamber precalciner. The results of simulation showed the characteristics of gas-solid flow that the gas rised spirally after being injected into the precalciner, the velocity in the center was lower, and the particles moved with gas-flow. The combustion of pulverized coal was mainly right in the upper of the swirl chamber and above the swirl chamber. The decomposition of calcium carbonate was also in the swirl chamber and the middle and lower part of the precalciner. The predicted coal burn-out ratio was about 100%, and the predicted calcium carbonate decomposition ratio was 96.14%. The results were in good agreement with actual measurement and can be used for further study to structure optimization design of precalciner.

Numerical Simulation of Coal and Natural Gas Co-Combustion in a Rotary Lime Kiln with Different Types of Coal

In order to improve the coal combustion condition, this essay based on an active lime rotary kiln in Wulongquan Limestone Mine of WISCO, focuses on the multifuel combustion of the coal together with natural gas by means of numerical simulation. To discuss the relationship of the flames with the coal composition, the cases with four different qualities of coal were compared. The gas phase is expressed with κ-e two-equation turbulence model; the discrete phase with particle track model; the combustion with non-premixed model; and the radiation with P1 radiation model. The results show that the volatile fraction content of coal has important impact on the early stage of the coal combustion; the natural gas burns out quickly to heat the coal and the gas flow.

Numerical simulation in combustion space of an oil fired float glass furnace

To reduce energy consumption and prolong furnace life, numerical simulation in the combustion space of an oil fired float glass furnace was carried out. The gas phase is expressed with k-epsiv two-equation model; the combustion is described with non-premixed model; the oil drop motion is described with Discrete Phase Model; the radiation is expressed with Discrete Ordinates Radiation Model. The simulation results agree well with the actual industry data. The results show that the flame covers widely and uniformly with a thin stagnation flow layer near the glass surface, being beneficial for melting glass melt effectually; there are back flows occurring near the crown, being beneficial for decreasing the crown heat duty.