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Research and Numerical Simulation of the CWS Burner for Gasification under High Ambient Pressure

Author: LiBo
Tutor: HuangZhenYu；ChengJun
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: Pneumatic Nozzle Atomization Pressure on the environment Numerical Simulation
CLC: TQ546
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 0
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Abstract


CWS gasification technology for clean coal technology research hotspot , the earliest introduction in China , and have been more in-depth development and research . But China 's coal-water slurry gasification technology there are still many problems , especially gasification nozzle technology is still a bottleneck in the development of coal-water slurry gasification technology . The three-channel mixing nozzle is the most widely used in the coal slurry gasifier nozzle atomization performance of the three-channel mixing nozzle in a pressurized environment has important practical significance . In this thesis, a three-channel external mixing nozzle atomization process under the the atomization chamber pressure conditions , mainly include two aspects: Experimental and Numerical experiments : First, the three-channel mixing nozzle in a pressurized environment flow characteristics of experimental research and analysis ; Second , research objectives , research the pressurized environment nozzle outlet structure parameter on the atomization performance ; then , the same droplet size SMD droplet size SMD the research goal of operating conditions of load , the rate of gas consumption and gas than the nozzle atomization performance change under different environmental pressures , analyze the reasons for these changes , different gas consumption rate , and under different environmental pressures fog of style was photographed observed and studied the atomization characteristics of changes in the angle ; Finally , the viscosity of the working fluid nozzle ' atomization performance under different environmental pressures studied and analysis . Numerical simulation : In this paper, the cold experiments carried out on the basis of numerical simulation . Three-dimensional physical model to establish a new type of three-channel mixing nozzle using k-ε two-equation model simulation the atomizing medium flow field distribution , and analysis of the velocity field , pressure field and the characteristics of the recirculation zone . In addition, using large-eddy simulation and DPM model the nozzle exit Breakup and atomization cold simulation , and analysis of non- steady-state characteristics of the spray field , the calculation results of the engineering design of the nozzle of great significance .

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CLC: > Industrial Technology > Chemical Industry > Coal gasification industry > Gasification process
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