The Chuanqi East Pipeline has a total of 3 Puqi, Lichuan and Qianjiang pressure stations. There are 3 compressors per compressor station. The mileage of Puguang compressor station is 0, the elevation is 352.5m, the shaft power of compressor is 13.0MW; the mileage of Lichuan compressor station is 275, the elevation is 1135.9m, and the shaft power of compressor is 15.7MW; Qianjiang compressor station The mileage is 764, the elevation is 30.9m, and the shaft power of the compressor is 13.3MW. 2 Compressor type selection.
The compressor is one of the core equipment for pipeline gas transmission. Adhering to the principle of advanced technology and economic rationality, the principles are as follows: meet the process requirements, and leave room for development. The unit should be reliable in operation, flexible in operation, wide in adjustable range (stable working condition of centrifugal compressor), simple in adjustment and control, and advantageous in automation. The price is appropriate, the life is long, and the installation and maintenance are convenient. High efficiency and low energy consumption per unit. #Unit's auxiliary equipment is as simple as possible. Consideration should be given to the level of manufacture and availability of the unit and the availability of accessories.
The centrifugal compressor is suitable for large flow, small pressure ratio, single-machine power, and the daily maintenance workload is small, the technical requirements for maintenance personnel are high, and the maintenance cost is low. The reciprocating compressor is suitable for small flow, large pressure ratio, and single-machine power, but the overhaul and routine maintenance work is large, and the maintenance cost is high.
Puguang, Lichuan, and Qianjiang's three compressor stations are put into operation, which has the characteristics of large flow, small pressure ratio and complicated working conditions, which requires the compressor to have strong adaptability. In terms of investment and use, centrifugal compressors were selected for the compressors of the three compressor stations.
3 compressor drive mode comparison.
Generally speaking, the driving equipment of the centrifugal compressor mainly has two types of adjustable speed motors and gas turbines.
As the driving equipment of the compressor, the most outstanding advantages of the motor are high efficiency, low noise, no pollution to the environment and high reliability. However, it is required to have external power supply conditions around the site, and the power supply and distribution system must meet the requirements of large-load power consumption of the compressor station. In addition, in order to adapt to the normal operation of the compressor unit under variable working conditions, the motor needs to be equipped with a variable frequency speed control system. The most prominent advantage of using a gas turbine as the driving device of the compressor is that the energy problem is easily solved, and the pipeline gas is used as an energy source with high reliability. The electric drive system is easier to implement remote control than the gas turbine system. Considering environmental protection and one investment and long-term operation and maintenance costs, the motor variable speed drive centrifugal compressor solution is much superior to the gas turbine drive.
4 compressor unit configuration.
After the type of compressor unit and the driving method are determined, the configuration of each compressor station unit is very important. The three gas stations of the Sichuan-East Gas Pipeline were used to analyze the one-use and one-unit configuration schemes used in each station, the two-in-one unit configuration plan and the three-use one-unit configuration plan. Unit configuration plan.
(1) Annual processing capacity of one compressor When the first station of Puguang reaches the designed transmission volume of 12 billion m3, it adopts one-use one-unit unit, two-purpose unit and three-unit unit.
(2) Adaptability of compressor unit From the perspective of the adaptability of the unit to the gas transmission volume, when the pipeline reaches the designed transmission volume in 2009, the initial pressure of the Puguang first station is 8.097 MPa (a), and the annual processing gas volume of the compressor is 12 billion m3. The high-efficiency area of ​​the pipeline compressor is generally 70%~130% of the designed flow rate. The configuration scheme of the one-use one-unit unit, the two-purpose unit and the three-purpose unit is used. The minimum flow rate that the unit can adapt to each year is about 84 respectively. Billion m3, 4.2 billion m3, 2.8 billion m3, which shows that the more the number of units, the wider the scope of flow.
(3) Puguang's first station unit adapts to Puguang's first station. In 2008, the compressor was put into operation. The annual gas transmission volume is 9 billion m3, which is about 75% of the designed gas transmission volume. It is used for one use, one for one, two for one and three. With a standby unit scheme, the gas volume requirement can be met, but the second and the third and the first one have a large room for adjustment of the intake air volume change of the first station.
However, the flexibility and adaptability of the change in gas volume is relatively poor.
(4) Unit power calculation Puguang's first station compressor adopts one-use one-unit unit, two-for-one unit, and three-unit unit, the motor power of single unit is 18.5MW, 9.5MW, 7MW. (5) Economic comparison From an economic point of view, considering compressors, motors, inverters, gearboxes, etc., the investment of 7MW compressor unit is 4.3 million US dollars, the investment of 9.5MW compressor unit is about 5.6 million US dollars, and the investment of 18.5MW compressor unit is about 11.22 million US dollars. Puguang's first station uses one spare unit plan, two uses one spare unit plan, and the equipment investment for the three-use and one-off unit plan is US$22.44 million, US$16.8 million and US$17.2 million, respectively.
The use of one-to-one unit plan, two-purpose unit plan, three-use unit plan power consumption of 444,000 kWh, 456,000 kWh, 504,000 kWh per day. According to the 2009 electricity price of 0.452 yuan / kWh, The use of the two-purpose one-station unit saves about 7.59 million yuan in electricity costs per year compared to the three-use one-unit unit. The annual use of the one-use unit is three million units, and the annual electricity saving is about 10.5 million yuan.
Therefore, from the perspective of efficiency and operating costs, Puguang's first station uses a two-in-one unit configuration. According to the above analysis results, the compressor unit configurations of the other two compressor stations are the same as those of the Puguang first station.
5 Conclusion
Through the analysis of the three types of unit configuration schemes of the Chuanqi East Transmission Pipeline Compressor Station, after considering the operating cost and operating efficiency, the three compressor units are selected as centrifugal compressors, the driving equipment is electric motor, and the unit configuration is used in two. Ready.
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