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Thermal Airflow Process of Grate-Kiln System and FLUENT Simulation

Author: ChenLiQiang
Tutor: ZhangXiLiang
School: Jiangsu University
Course: Mechanical Design and Theory
Keywords: Chain grate - kiln system Heat transfer theory Hot air stream process Design FLUENT simulation
CLC: TF046.6
Type: Master's thesis
Year: 2010
Downloads: 213
Quote: 0
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Abstract


The chain grate - kiln pellet production method has the advantages of adaptability of raw materials, production capacity, uniform roasting high grade pellets, recyclable waste heat, in recent years, China's rapid development. Current the chain grate - kiln system heat Merry process exist: system low temperature exhaust gas direct emissions; the GRATE return segment the grate bed exudes a lot of heat, no recycling; annular cooler recycle gas temperature is not higher. Waste heat loop recycling efficiency and low pollution emissions. Do this, to carry out the grate - kiln system the thermal the Merry process improvement design to further reduce emissions, improve the efficiency of heat recovery, to achieve the purpose of energy conservation, the development of socio-economic significance. Mainly includes three aspects. (1) chain grate - kiln system heat Merry process to improve the design. In the analysis of the current chain grate - the rotary pellet manufacturing process and thermal Merry process based on existing waste heat recovery of low utilization efficiency and exhaust gas emissions from large proposed based on multiple cycles of convective heat transfer waste heat recycling The chain grate - kiln system heat Merry process to improve the design. (2) waste heat recovery theoretical analysis and structural design. One hand, according to the the GRATE structure and heat transfer theory, combined with the 2.4 million tons of Grate process characteristics and technical requirements, design grate heat recovery unit, several theoretical estimate of the convective heat grate heat grate bed waste heat recovery rate of 60%; theoretical estimates of the other hand, the analysis of the structure and working principle of the annular cooler, combined with the process characteristics and technical requirements of 2.4 million tons annular cooler on the ring cooler heat Merry process multiple convective heat The outlet gas temperature, respectively, than the corresponding section of the hot air stream process, to improve the design of new hot air stream process above 106 ° C, 168 ° C, 52 ° C or so. (3) the thermal the Merry process of computational fluid dynamics analysis. Based on the theory of computational fluid dynamics applications before processing software GAMBIT and FLUENT simulation software, the hot grate heat recovery unit and ring cooler Merry process simulation analysis, results show that: the waste heat recovery section of the grate bed each outlet gas temperature were 268 ℃, 354 ℃, 427 ℃, waste heat recovery and theoretical calculations are consistent; ring cold machine the the new hot Merry process each section outlet gas temperature rise is basically consistent with the theoretical calculations. The theoretical calculation and simulation analysis show that the improved design, chain grate - kiln system heat Merry process effective and feasible, and has a strong reference value and guiding role in the future practical application of engineering.

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CLC: > Industrial Technology > Metallurgical Industry > General issues > Smelting of raw materials and ore pretreatment > Ore pretreatment, sintered pellets > Pellets
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