In China

natural gas utilization has been become more and more important due to the growing challenge in energy and environment

and the multiple natural gas supplies with wide variation in heating value have been employed in the gas distribution network.Many industrial and commercial users have a high request for a stable gas quality

especially for those gas turbine power plants.The gas-fired units such as gas turbines are sensitive to the fluctuations of the gas heating value

and the variation range and speed are usually strictly restricted by the manufacturers.Thus the method for prediction of the variation speed of the gas composition in the gas network with multiple gas supplies needs to be studied.In this paper

a dynamic simulation model involving heating value fluctuation for the complex natural gas network with interchange of gas supplies which have different combustion properties has been established based on transient mass transfer model for a supplies-replace-type of gas pipeline

and the application of the developed simulation model for predicting heating value fluctuation at the down flow nodes of a real gas distribution network were displayed with a case study.