Research on the uniform flow distribution technology of volatile matter in vertical shaft furnace based on empirical model
Using numerical simulation technology,the changes in the distribution proportion of volatile matter in the same group of flue of vertical shaft furnace were calculated after changing negative pressure.The following conclusion was drawn:a small fluctuation in the negative pressure of the flue can cause a significant fluctuation in the distribution of volatile matter.If the negative pressure of a certain flue in the same group increases by 5 Pa,the proportion of volatile matter in that flue will increase by 16%.Based on the analysis of the characteristics of the vertical shaft furnace,a comparison was made between the use of multi variable PID control technology and the empirical model based vertical uniform flow distribution technology for volatile matter.The difference in control effectiveness was as fol-lows:the former has a main control target temperature fluctuation range of±15℃,but the system stability is poor and the automation rate is relatively low.At the same time,the frequency of actuator adjustment is high,and the equipment life is short.The latter combines expert experience and fuzzy control,considering the synergistic relationship between valve opening,combustion air volume,negative pressure,and volatile distribution,to achieve a main control target temperature fluctuation range of±20℃.The system stability and au-tomation rate are significantly improved,and the production and operation costs are lower.It is more effective in controlling the complex and variable volatile combustion of vertical shaft furnaces.
Vertical shaft furnacevolatile matteruniform flow distributionempirical modelPID control
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