282
Y. Xu et al.
Table 1. (continued)
Project
Data
nC 5 H 12 0.01
C 6 +
0.01
H e
0.02
N 2
0.01
CO 2
0.31
H 2 S
0.81
H 2 O
1.55
H 2
0.01
Temperature, °C
18
Pressure, MPa
4.75
Flow rate of feed gas, Nm 3 /d 14.8 × 10 5
3.2 Purification Plant Process Simulation Model
According to field data, the process of natural gas purification plant model was established by Aspen HYSYS. The purification plant mainly includes GSU, DU, SRU and
TGTU. Different physical property packages were used in different units. In the GSU,
according to the characteristics of the acid gas removal process of the alcohol amine
solution, the acid gas chemical solvent property package was selected. The Cubic-PlusAssociation property package is used in the DU. In the SRU and TGTU, considering the
formation of sulfide, sulsim property package was selected. Figure 3 shows the Aspen
HYSYS model of the entire purification plant.
3.3 PSO Optimization Model of Unit Energy Consumption
In order to minimize the unit energy consumption of the purification plant, the PSO
algorithm was established to optimize the operating parameters of the purification plant.
Eight operating parameters are selected as optimization variables in the GSU, DU, SRU,
TGTU. Determine the scope of each optimization variable according to the regulations
of on-site operation. The following Table 2 gives the name and range of optimized
variables.