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Y. Xu et al.
Fig. 1. A Steady-state simulation flow chart of natural gas gathering pipe network
3 Hydrate Prediction
During the operation of the gas gathering pipeline network, liquid water may exist in pipe.
When the temperature and pressure reach the hydrate formation conditions, hydrate will
be formed in the pipe. The existence of hydrate will seriously affect the normal operation
of the gas gathering pipeline network, so it is necessary to judge the formation position
of hydrate in the pipe. The two important factors that affect the formation of hydrate are
temperature and pressure. The pressure and temperature parameters of each pipe node has
been obtained by hydro-thermal calculation of the gas gathering pipeline network, which
provides boundary conditions for the hydrate prediction of the pipe. The thermodynamic
model of hydrate prediction is the formation temperature at a given pressure or the
pressure at a given temperature. At present, there are many thermodynamic models for
the hydrate prediction: the Vdw-P model, the Parrish-Prausnitz model, the Du_Guo
model, the Chen_Guo model, etc. The Chen_Guo that based on two-process hydrate
nucleation kinetic mechanism model theory is used in this paper. This model has the
advantages of simple calculation and high precision. It is used to predict the formation
of natural gas hydrate and obtains relatively ideal results.
Y. Xu et al.
Fig. 1. A Steady-state simulation flow chart of natural gas gathering pipe network
3 Hydrate Prediction
During the operation of the gas gathering pipeline network, liquid water may exist in pipe.
When the temperature and pressure reach the hydrate formation conditions, hydrate will
be formed in the pipe. The existence of hydrate will seriously affect the normal operation
of the gas gathering pipeline network, so it is necessary to judge the formation position
of hydrate in the pipe. The two important factors that affect the formation of hydrate are
temperature and pressure. The pressure and temperature parameters of each pipe node has
been obtained by hydro-thermal calculation of the gas gathering pipeline network, which
provides boundary conditions for the hydrate prediction of the pipe. The thermodynamic
model of hydrate prediction is the formation temperature at a given pressure or the
pressure at a given temperature. At present, there are many thermodynamic models for
the hydrate prediction: the Vdw-P model, the Parrish-Prausnitz model, the Du_Guo
model, the Chen_Guo model, etc. The Chen_Guo that based on two-process hydrate
nucleation kinetic mechanism model theory is used in this paper. This model has the
advantages of simple calculation and high precision. It is used to predict the formation
of natural gas hydrate and obtains relatively ideal results.