Integral Numerical Investigation on Combustion of Blended Coal in Revolving Cement Kiln

• Published in: Combustion science and technology Vol. 161; no. 1; pp. 309 - 321
• Main Authors: HOU, LING YUN, FU, WEI BIAO
• Format: Journal Article
• Language: English
• Published: London Taylor & Francis Group 01.12.2000; Taylor & Francis
• Subjects: Applied sciences; blended coal; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Furnaces. Firing chambers. Burners; general model; revolving cement kiln; Solid and pulverized fuel burners and combustion chambers; Hard coal; Two phase flow; Turbulent flow; Cement kiln; Pulverized coal; Finite volume method; Numerical simulation; Combustion; Radiative transfer; Bituminous coal; Mixture; Heat transfer
• ISSN: 0010-2202; 1563-521X
• DOI: 10.1080/00102200008935821

Blended coal that consists of 70% anthracite and 30% bituminous coal is cheaper than pure bituminous coal, but it is very difficult to bum in the revolving cement kiln. To bum the blended coal, a new kind of burner, which is called the burner with velocity difference jets, is used. The combustion processes in the revolving cement kiln are simulated by means of improved multi-fluid model for two-phase turbulent flows with reaction. The better burner construction is decided by simulation, which should not only ensure the ignition and stable combustion for blended coal but also restrain the expansion of pulverized coal flow and make flame not touch the slagging layer of kiln. The results of integral simulation show that the ignition of blended coal is slower than that of bituminous coal, but the flame of blended coal is longer than that of bituminous coal. Thus the use of blended coal not only reduces the cost but also suits wet kiln better