A three-dimension full-size numerical simulation of the effect of air distribution on turbulent flow and combustion in a tubular heating furnace was carried out. A standard k –ε turbulent model, a simplified PDF c...A three-dimension full-size numerical simulation of the effect of air distribution on turbulent flow and combustion in a tubular heating furnace was carried out. A standard k –ε turbulent model, a simplified PDF combustion model and a discrete ordinate transfer radiation model were used. The hybrid grid combining a structured and a non-structured grid was generated without any simplification of the complicated geometric configuration around the burner. It was found that the multistage combustion could reduce and control the peak value of temperature. At the same time, it was concluded that the amount of primary air had little effect on the global distribution of velocity and temperature in the furnace, but a great effect on that around the burner. It is recommended that 45% - 65% of the total amount of air be taken in in primary air inlets in the furnace. All the results are important to optimize the combustion progress.展开更多
This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the p...This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the pulverized coal injection. The flow measurements were taken in the blast furnace down leg pipes by installing refractory Venturi tubes. The system for the calculation of differential pressure takes into consideration the dimension of the Venturi, the air density and compressibility. The objective is to specify the flow transmitters required to automate a control system and implement safety interlocks for the coal injection plant.展开更多
文章提出一种能够准确评估高炉风口鼓风均匀性的方法,并以通才公司1860 m 3高炉的热风围管、热风支管、直吹管和风口小套为研究对象,采用CFD仿真研究方法,对高炉风口鼓风均匀性进行计算评估,根据评估结果对高炉风口参数进行针对性调节...文章提出一种能够准确评估高炉风口鼓风均匀性的方法,并以通才公司1860 m 3高炉的热风围管、热风支管、直吹管和风口小套为研究对象,采用CFD仿真研究方法,对高炉风口鼓风均匀性进行计算评估,根据评估结果对高炉风口参数进行针对性调节。结果表明,高炉风口尺寸相同时风口鼓风均匀率为95.69%,调节风口参数后风口鼓风均匀率可提高1.12个百分点,很大程度上改善了高炉风口鼓风均匀性。展开更多
文摘A three-dimension full-size numerical simulation of the effect of air distribution on turbulent flow and combustion in a tubular heating furnace was carried out. A standard k –ε turbulent model, a simplified PDF combustion model and a discrete ordinate transfer radiation model were used. The hybrid grid combining a structured and a non-structured grid was generated without any simplification of the complicated geometric configuration around the burner. It was found that the multistage combustion could reduce and control the peak value of temperature. At the same time, it was concluded that the amount of primary air had little effect on the global distribution of velocity and temperature in the furnace, but a great effect on that around the burner. It is recommended that 45% - 65% of the total amount of air be taken in in primary air inlets in the furnace. All the results are important to optimize the combustion progress.
文摘This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the pulverized coal injection. The flow measurements were taken in the blast furnace down leg pipes by installing refractory Venturi tubes. The system for the calculation of differential pressure takes into consideration the dimension of the Venturi, the air density and compressibility. The objective is to specify the flow transmitters required to automate a control system and implement safety interlocks for the coal injection plant.
文摘文章提出一种能够准确评估高炉风口鼓风均匀性的方法,并以通才公司1860 m 3高炉的热风围管、热风支管、直吹管和风口小套为研究对象,采用CFD仿真研究方法,对高炉风口鼓风均匀性进行计算评估,根据评估结果对高炉风口参数进行针对性调节。结果表明,高炉风口尺寸相同时风口鼓风均匀率为95.69%,调节风口参数后风口鼓风均匀率可提高1.12个百分点,很大程度上改善了高炉风口鼓风均匀性。
