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Numerical Study on Thermal Resistance Characteristic of Airflow Channel in the Oxidation Bed

Author: ChenXiangChun
Tutor: LiuYongQi
School: Shandong University of Technology
Course: Power Machinery and Engineering
Keywords: VAM Honeycomb Ceramic Regenerative oxidation bed Resistance loss The efficiency of heat transfer CFD
CLC: TK124
Type: Master's thesis
Year: 2011
Downloads: 74
Quote: 1
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Abstract


The coal mine ventilation air methane concentration (lt; 0.1%), enrichment is difficult, and large-minded features, the traditional approach is to directly emptying , which caused serious air pollution and the greenhouse effect . The thermal counterflow oxidation technology is an effective way to deal with VAM , effective oxidation of the lack of wind and heat recycling . Ceramic oxide bed is the thermal counterflow oxidation technology key components of the flow and heat transfer performance is related to whether the efficient use of VAM . Currently, cellular ceramic as a regenerator has been widely used, but also the lack of in-depth study of honeycomb ceramic regenerator resistance loss and comprehensive understanding of the heat exchange mechanism , regenerative oxidation bed design is also a lack of accurate design basis . This paper uses Fluent software numerical simulation of the thermal resistance characteristics of honeycomb ceramic . The structure parameters , operating parameters and the physical parameters of the resistance loss and temperature efficiency . The calculation results show that : the edge length and wall thickness of these two structures , one for quantitation , and the other variables, the impact of the opening rate determining an inlet flow rate of the size of the resistance loss is much larger than the intensity of the process heat exchanger resistance loss impact; same conditions , mullite honeycomb ceramic heat flow greater than cordierite honeycomb ceramic heat flow . The honeycomb ceramic multi-channel mathematical model to study the law the honeycomb ceramic oxide bed gap honeycomb dislocation resistance loss . Come gap and dislocation of the relationship between the loss of the hexagonal holes cellular ceramic resistance is less than the its square hole honeycomb ceramic resistance loss ; impact resistance loss greater than the loss of resistance at low temperatures at high temperatures ; resistance loss variation with dislocation relationship has nothing to do with the temperature . To ensure the loss of the overall resistance of the oxide bed minimum, should ensure that a gap of 1-2mm in the installation of the ceramic honeycomb , the back and forth between the two ceramic honeycomb . Countercurrent oxidation unit based on its own research and development of thermal and regenerative oxidation bed channel mathematical model , preliminary simulation of spontaneous combustion oxidation of methane in the oxidation bed . And study the combined oxidation resistance characteristics of the bed , and combinations of ceramic honeycomb impact of loss of oxidative bed resistance .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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