GE intelligent platform PAC8000 system application in gas

Abstract: PAC8000 control system with its unique characteristics in the petrochemical industry in southwest oil and gas pipeline in gas transmission station station control and gas flow measurement tasks, implements the user on the same platform station control and flow metering function in the first place. Key words: natural gas, flow metering, PAC8000, GE China southwest oil and gas field, a new stream - oil AnBian gas transmission pipeline engineering include west brook, grace, Wang Jiaqiao and false creek gas transmission station, responsible for receiving nearby gas to air and gas supply task for local municipal and factory production. Requirements gathering various gas pipeline gas station control system of temperature, pressure, differential pressure signal flow calculation, at the same time can be remote control valves and valve opening pressure adjustment according to. All the gas station control system is composed of station control computer and PLC control station, realize the yard process parameters and equipment operation status data acquisition, monitoring, control and flow calculation, and other functions, and realization process, parameter setting and production reporting features. PAC8000 system hardware design can achieve explosion-proof 2 area is installed directly, working temperature in - 40 ~ 70 degrees Celsius, G3 anticorrosive certification. At the same time, PAC8000 system can strictly according to GB/T21446 - 2008 standard requirements, according to the pipeline and orifice parameters, gas composition, static pressure, differential pressure and temperature parameters calculation of natural gas instantaneous flow and cumulative amount of measurement data, at the same time provide instrument verification, orifice plate clean, time calibration, data records, operation records, and other functions, flow measuring accuracy can reach five over ten thousand. 1. System structure due to the entire system USES a unified hardware platform, so all the control unit can access the same network, simplifies the system structure. The system structure is shown in figure 1. PLC controller in the system as a whole part is mainly responsible for gas station parameters collection, flow calculation and equipment control, the controller, power supply and network with redundant configuration. All the signals after the surge protector isolation access I/o module, controller will data processing to the collected signals, and through the Ethernet communication to stand accused of computer, provide a standard IEC61131 - within the controller 3 programming language implementation of specific requirements, such as valve control, the PID controller at the same time provide 2 of redundant RS485 interface, which can realize redundant serial communication between devices with a third party. Natural gas flow metering module according to the GB2008 standard 4 road line flow metering function, at the same time provide redundant Ethernet interface will be uploaded to the measurement results of the station control computer for display, recording and reporting features. 1. 1 control station according to the characteristics of the production plant and control requirements, part stands accused of PLC controller has chosen the redundant PAC8000 logic controller, the controller has a highly flexible inputs and outputs of data acquisition and control functions, can realize the conventional control, logic control and sequence control. Controller adopts the IBM PowerPC 266 MHZ 32-bit microprocessor, 25 m memory, dual Ethernet and serial communication interface, support API, fieldbus, ModBus, HART, peer-to-peer communications and OPC, can implement redundant configuration, can be directly installed in the danger zone, 2 G3 anticorrosive certification requirements. A controller can install up to 64 I/O module, support hot plug. Dual power supply. Redundant controller configuration, redundancy as spare controller, synchronous receive input signal data, synchronous execution control calculation, at the same time to deliver results. When a controller to detect error, trouble-free controller can be control, then immediately implement the undisturbed switching. 1. 2 IO module PAC8000 system of power supply, controller and I/O modules can be installed directly 2 dangerous area, part of the I/O module built-in intrinsically safe security gate, no additional installation safety barrier, isolation, monitoring, and the LED indicator, support a variety of signal types, support online hot plug. Analog input A/D conversion resolution reached 16, analog output reached 12, A/D conversion resolution to loop testing on the spot, the built-in input variable linearization, engineering unit conversion, square root filter, alarm and cold junction compensation arithmetic functions. IO card has the fastest 20 ms analog regulating function, 10 ms digital quantity control and 1 mssoe control functions. 1. 3 flow metering unit flow metering unit belongs to PAC8000 special modules in the system, at the same time achieve the function of up to 8 natural gas flow metering. Flow metering unit of all parameters and the calculation results can be directly uploaded to the operating station HMI software via Ethernet, at the same time also can change the gas from the operating station measurement parameters and components. PC8 flow metering module based on GE's industrial computer, using Intel Celeron M processor, frequency can reach 1. 5 GHZ, 1 m memory and 320 g storage space. PC8 correlates module at the same time provide two redundant Ethernet interface, 4 serial communication interface, can provide four IO module interface. Power supply 24 v dc power supply for industry, working temperature between 0 ~ 50 degrees Celsius, MTBF, 76000 hours, in order to meet the ROHS, CE, UL and other international standards. PC8 communication module support rail and slab installed in two ways. PC8 flow metering module can support 4 to 8 gas pipeline flow metering requirements, with PLC controller control system, RTU), can achieve the function of flow measurement redundancy. Which normally USES the PC8 flow measurement module implements accurate flow measurement, a hardware failure or communications failure if measurement module, measurement function is to switch to other flow metering, PLC or RTU module, this approach can minimize the error, improve the usability of flow metering.
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