1. 1 basic conditions for integrated optimization
1. 2 Shaanxi and Beijing first-line operation status
It can be seen that the Shaanxi-Guangzhou line can be partially or fully transferred to the Shaanxi-Beijing second line except for the non-pressurized transmission of 13×10 8 m 3 / a. The gas volume from the gas transmission volume of the Shaanxi-Beijing line to the second line can be up to 23×10 8 m 3 / a, and the daily conversion volume is 630×10 4 m 3 /d.
1. 3 integrated optimization after running conditions
Since the design transmission capacity of the first and second lines of Shaanxi-Beijing is only realized under the operation of the compressor unit, the integration and optimization operation of the first and second lines of Shaanxi-Beijing is not only the first- and second-line gas distribution, but also the most important condition through gas volume allocation. The best operating conditions for the lower compressor unit. For example, before the second line reaches the design transmission volume, the remaining power of the second-line unit can be used to divide the partial gas volume into one line, and the first- and second-line integrated optimization operation is realized, and the calculation results of the integrated working conditions of the compressor station are obtained. Even after the second line reaches the design transmission, the integrated optimization operation can be utilized to ensure the optimal operating conditions of the unit in different peak states of the gas.
1. 4 economic benefits of integrated optimization operation
The economic benefits of integrated and optimized operation are mainly reflected in the following two aspects: a. By optimizing the unit configuration of the second line of Shaanxi and Beijing, the movement can be avoided and the number of unit expansions can be reduced, thereby reducing the investment in expansion funds.
b. Saving operating costs (for example, before the second line reaches the design transmission).
From the calculation of the integrated working conditions, the independent operation and integration demand power of Shaanxi-Beijing First and Second Lines can be compared. It can be seen that the required power of the integrated working conditions is significantly smaller than the required power of the independent operating conditions. The above operating modes can also be used to achieve the designed output. After the gas volume deployment.
1. After the integration of the first and second lines, the accident dispatching capability is enhanced.
Since the first and second lines have realized integrated and optimized operation, the air volume allocation between the first and second lines is very flexible, which enhances the accident adaptability of the entire pipeline. For example, in the case of an accident in the Dingli River section of Lingqiu in the Shaanxi-Jiangxi line from 2006 to 2008, the first line The 3.6 billion gas volume can be transported to Beijing by Yongqing through the second line to ensure normal gas supply in Beijing. If an accident occurs in the D Liuli River section of Lingqiu after 2009, consider using four gas storages (North China Gas Reservoir, Dazhangyu Gas Reservoir, Plate 876 Gas Reservoir, Dagang Sanku) to supply gas to Beijing. The accident occurred on the peak month peak day, and the four gas storages have no excess gas volume to supplement the gas line. The surplus gas transmission capacity of the Shaanxi-Beijing second line can be used to increase the output to compensate for the partial gas supply of the Shaanxi-Beijing line. It depends on the surplus of Shaanxi-Beijing second-line gas transmission capacity.
2 First and second line integration optimization operation requirements for station design
2. 1 Yongqing Station Design Features
According to the technical requirements for the optimization of integrated operation of the first and second lines, Yongqing Station is one of the hub stations for the integration of Shaanxi-Beijing First Line and Shaanxi-Beijing Second Line. Therefore, in the design of Yongqing Station on the second line of Shaanxi-Beijing, the process can be realized to realize the second line of Shaanxi and Beijing. The gas can be transferred to Yongqing Station of Shaanxi-Jiangsu Line to Tianjin, Dagang, Weizhou and other places. When an accident occurs in the upper reaches of Shaanxi-Jiangjing Line, it can also pass the gas of Shaanxi-Jiangsu Line through the first station of Shaanxi-Beijing Second Line. Transfer to the second line of Shaanxi and Beijing and then pass the station to the Yongqing Station of the first line. The second line of Shaanxi-Beijing to the Dagang gas storage three reservoirs or the gas from the Dagang gas storage three reservoirs can also be deployed through this station. Therefore, the design of the Yongqing Station of the second line of Shaanxi-Beijing Railway can meet the above requirements, and it also works for the first-line Yongqing station. The corresponding transformation.
2. 2 Yulin Station Design Features
The second-line Yulin station has gas from Changqing gas field, Sinopec gas, Changbei gas field, and tie line Jingbian gas. According to the first and second line integration optimization operation requirements, the design of the second line Yulin station and the first line Yulin station are required. The process is organically combined to ensure that the first and second line natural gas are flexibly deployed at Yulin Station. The imported gas from the Yulin gas station of the Shaanxi-Jiangxi line can be combined with the low-pressure gas from the Changqing gas field, the Sinopec gas, and the Changbei gas field to enter the low-pressure gas inlet pipe of the compressor inlet. After the supercharged air cooling, the station exits to the second-line trunk line. When the second-line pressure is low, the gas from the exit of the Yulin Compressor Station of the Shaanxi-Beijing line can also go directly to the second-line trunk line, or enter the second line in medium-pressure mode or re-pressurize the unit.
When the Jingbian gas is high-pressure gas, when the Jingbian gas is high-pressure gas, it can be directly connected to the downstream of the second-line trunk line by the compressor outlet of the Yulin station and the supercharged gas of the second-line unit; when the Jingbian gas is medium-pressure gas The medium-pressure air-sink that can be connected to the compressor inlet of Yulin Station is discharged to the second-line trunk line or directly to the downstream of the second-line trunk line after being pressurized and air-cooled. It can also be directly transported to the first-line exit after the pressure is applied. When Jingbian gas is low-pressure gas, the low-pressure gas-sinking pipe that can be imported into the compressor station of Yulin Station can be discharged to the second-line trunk line after being pressurized and air-cooled.
2. 3 Jingbian Station Design Features
a. Due to the completion of the Jingyu line, the Shaanxi-Beijing first line, the Shaanxi-Beijing second line and other pipelines between the pipelines to coordinate the supply of gas.
b. Require Jingbian Station to design a communication line to transfer the natural gas from the West to East to the second line of Shaanxi and Beijing.
c. Require Jingbian Station to transfer the natural gas of the second line of Shaanxi-Beijing to the West-East Gas Pipeline through the tie line. At this time, the natural gas required to export the compressor of the second line of the first line of Yulin can pass through the contact line to the West-East Gas Transmission Station. Export, at this time, the natural gas is pressurized by the compressor of the first station of the Shaanxi-Beijing second line.
d. Require the transformation of Jingbian Station to transfer the natural gas of Shaanxi-Beijing line to the contact line and then enter the second line of Shaanxi-Beijing.
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