“The flow measurement of natural gas is a major issue in the supply and reception of natural gas, and is the basis for natural gas trade settlement. Due to the large deviation of bearing wear accuracy caused by the operation of the flowmeter, the failure of Electronic components or calibration instruments and other reasons, the measurement accuracy deviation and non-measurement phenomenon caused by the flowmeter are more common in the industry.
The flow measurement of natural gas is a major issue in the supply and reception of natural gas, and is the basis for natural gas trade settlement. Due to the large deviation of bearing wear accuracy caused by the operation of the flowmeter, the failure of electronic components or calibration instruments and other reasons, the measurement accuracy deviation and non-measurement phenomenon caused by the flowmeter are more common in the industry.
The result often leads to conflicts between gas suppliers, gas users, and meter manufacturers. With the completion of the West-East Gas Pipeline Project, there are more and more gas supply units and gas users, and the problems are becoming more and more prominent. How to ensure the accurate measurement of natural gas without causing measurement loss has become the focus of attention in the industry. Therefore, the application of industrial computer in the natural gas flow monitoring system is also very important.
(Gas large user flow monitoring system)
The natural gas flow monitoring system refers to a computer control system based on monitoring that uses various instruments, control devices, electronic computers and other automated technical tools to collect on-site information, and transmit the on-site information to the control center through cables or networks for Display and reporting. The flow monitoring system is designed using SCADA system structure and orifice plate flow measurement method. This model can well combine advanced computer processing technology with traditional measurement methods.
The natural gas flow detection and control intelligent system is an indispensable project for natural gas collection stations and gathering stations. Natural gas collection stations and gathering stations are of special significance for understanding the size of natural gas flow and the automatic adjustment of natural gas flow under specific circumstances. This subject is an intelligent flow detection and control system designed according to the actual situation of a natural gas gathering and transportation station. Its main task is to develop a new type of natural gas flow detection and control intelligent system with DCS structure as the framework and PLC module as the core of data acquisition and control. Through the research of this subject, the following research results have been obtained:
A control model with PLC as the core and industrial computer as the man-machine interface is proposed, which is suitable for real-time calculation of natural gas flow. By reading the pressure, temperature, pressure difference, room temperature and other measured values at any time of each measuring point, and combining relevant parameters, real-time calculation of instantaneous flow and calculation of cumulative flow for any period of time. According to the special requirements of users, the detection and flow control of natural gas flow are realized. Let’s take a look at the recommended application of industrial computer in the natural gas flow monitoring system:
(Natural gas flow meter)
The specific configuration of the industrial computer: Dongtian 4U industrial computer DT-610P-JQ77MA
(Dongtian 4U industrial computer DT-610P-JQ77MA)
Dongtian 4U industrial computer, supports Intel Core 3rd generation I3/I5/I7 processor, adopts Intel Q77 chipset, supports 12 USB ports, of which 8 USB2,0 ports, 4 USB3,0 ports, data transmission speed can be Up to 500Mbps. It comes with 10 serial ports, including 1 232/422/485 serial port and 9 232 serial ports, with abundant ports. It is especially suitable for the occasions where a variety of external equipment needs to be connected to work. The motherboard provides 4 PCI slots, 1 PCI-E*16 slot, 1 PCI-E*4 slot, 1 PCI-E*1 slot, which can be installed with independent graphics card, with the help of Intel Turbo Boost Technology, The processor speed can be automatically increased according to the tasks performed by the customer on the computer.
Chipset Intel Q77 chipset
CPU supports LGA1155 pin, supports Intel Core 3rd generation I3/I5/I7 processor
Memory 4*240pin DDR3 1066/1333DIMM memory slot, maximum support 32G
Display 1 VGA interface, 1 DVI-D interface, 1 HDMI interface
Hard disk 4 SATA II ports, 2 SATA III ports
Network 2 Intel 82579LM/82574L Gigabit Ethernet ports
Expansion: 4 PCI slots, 1 PCI-E*16 slot, 1 PCI-E*4 slot, 1 PCI-E*1 slot
Serial port 10 COM ports (1 232/422/485, 9 232)
Parallel port 1 LPT interface (1 232/422/485, 5 232)
USB 8 USB2, 0 ports, 4 USB3, 0 ports
GPIO 4-bit DI, 4-bit DO
I/O front panel interface 2 front USB2, 0 interface, 1 power button, 1 reset button, 1 power indicator, 1 hard disk status indicator, 2 DVD drive positions
I/O rear panel interface: 1 VGA port, 1 DVI-D port, 1 HDMI port, 2 Gigabit Ethernet ports, 2 USB3.0 ports, 4 USB2, 0 ports, 10 serial ports, 1 Parallel port, 3 audio interfaces
Audio line-in interface, line-out interface, Mic-in interface
Sound card Realtek ALC662 audio
Power supply 300W rated power
Chassis size 430 (480) * 450 * 177mm (width * depth * height)
The weight of the whole machine is about 23 kg
System supports Windows 7, Windows 8, Windows 10, Windows 2003, Windows 2008, Linux, Centos
At the same time, due to time and knowledge constraints, there are still many imperfections in the software design of the upstream and downstream control systems, which need to be further improved. The following industrial computer PLC control programs need to be further optimized, the fast approximate system to solve the contradiction and the stability is not excessive, to achieve a smooth and fast control system; the upper computer monitoring program interface needs to be further beautiful, the database management function needs to be strengthened, and the network service security function is Perfect wait. These issues need to be gradually improved in future work. The above is the application of industrial computer in the natural gas flow monitoring system.