Numerical Simulation Analysis on Deviation Factors of Powder Feeding Pipeline in Power Plant
The deviation of powder feeding pipeline in power plants has a very important influence on the stability of boiler combustion,the safety and economy of boiler operation,and the flexibility of ther-mal power generating unit operation.In order to deeply investigate the influence of coal powder fine-ness change and coal powder concentration change at the entrance of powder feeding pipeline on the deviation of powder feeding pipeline outlet,the powder feeding pipeline corresponding to B coal mill in the direct-blowing pulverizing system of a certain power plant is taken as the object of study,and nu-merical simulation calculations are carried out on the powder feeding pipeline by using the solver soft-ware ANSYS Fluent.The results show that with the increase of the fineness of coal powder in the pipe-line inlet,the deviation of the wind speed(coal powder concentration)at the outlet of each powder feeding pipeline is not obvious;with the increase of the coal powder concentration at the inlet of the pipeline,the deviation of the wind speed(coal powder concentration)at the outlet of each powder feed-ing pipeline is gradually reduced,and the maximum deviation of the wind speed(coal powder concen-tration)at the outlet of the pipeline is significantly reduced.Through the numerical simulation of the in-fluencing factors of the deviation of the powder feeding pipeline,it can be seen that the fineness of the coal powder at the entrance of the powder feeding pipeline has no influence on the deviation of the pipeline outlet,and the increase of the concentration of the coal powder at the entrance of the powder feeding pipeline can help to reduce the deviation of the pipeline outlet.
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