Abstract:

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.

Key words: natural gas, dynamic simulation, heating value fluctuation, mixing pipeline, numerical simulation

摘要：

随着我国对环境的日益重视和能源结构的调整,天然气的应用越来越多,天然气气源也不断增多,燃气管网日益复杂。很多工商业用户对于燃气气质的要求较高,特别是对于燃气机组而言,燃气机组对热值波动以及热值变化率等气质较为敏感,燃气热值和热值变化率只能在一定范围内波动。日趋复杂的气质能否满足燃气电厂等工商业用户严苛的气质要求的问题亟需进一步研究。在气质瞬变模型的基础上建立了质换型天然气混输管网的仿真模型,模拟了某管网在气质质换过程中下游各节点的热值变化情况,对结果进行了分析。

关键词: 天然气, 动态仿真, 热值波动, 混输管网, 数值模拟