Improvement Research on Furnace Flue Tube of Three Medium Dryer System Used by Fan Mills

Abstract:

Pulverizing system equipped by fan mills uses three medium (ie. low-temperature furnace smoke, high-temperature furnace smoke, hot air) for drying coal, especially in large-scale plants burning lignite. A constantly increasing unit capacity leads to a more complicated design for pulverizing system, with a heavier weight of furnace smoke tube. This paper focuses on a research of water-cooled membrane flue tube instead of traditional inner and outer insulation tube through experiments like changing water side parameters to replace the low-temperature flue pipe from three medium to two medium (ie. adjustable-temperature furnace smoke, hot air). This paper studies heat transfer coefficient of water-cooled furnace smoke pipe at different flow rate and flue gas temperature though a established water-cooled furnace smoke pipe test bed. It is using a certain mathematic method to obtain dimensionless relationship among Nu, Re, Pr and obtain the dimensionless rule equation of water-cooled furnace smoke tube.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 3301-3305
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.3301
• Online since: October 2013
• Authors: Zhen Yao Qu, Qiang Wang
• Keywords: Heat Transfer Mechanism, Membrane Flue Tube, Thermal Modeling, Thermodynamic Calculation

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