Automation level in thermal power units with double inlets and double outlets coal mills is relatively low because the mills dynamic characteristics and mathematical models were lack of studying.Thus the unit operation economy is decreased.Against this problem

the process parameters of the coal mill with double inlets and outlets were investigated

such as the pulverized coal level

outlets temperature and feed coal flow.On this basis

the mechanism modeling method was employed to establish the mathematic model for process parameters' dynamic characteristics.Moreover

combing with the practical running data

the pulverized coal level model was verified.The results show that

the output of the built model agrees well with the actual coal level's change

indicating this established model is applicable for describing the real dynamic characteristics of process parameters.