Abstract
The paper introduces the performance test system of gas ratio control valve, which is composed of test platform, valve pressure tester and flow measuring instrument. The test system is used to detect the character of ceramic nozzle regulator. The function of the system is realized by the LABVIEW software. The paper brings out the development process of the control system,including hardware design, software design and debugging. Finally, a comprehensive performance test system was built.
1 Introduction
Gas ratio control valve is composed of actuator and valve body, and it mainly acts as a pipe throttling equipment in the natural gas pipeline. It is usually directly installed on the pipeline to adjust the flow rate. Gas ratio control valve is one of the most important basic instruments in the pipeline system. The performance of the valve has a great influence on the stability, operating speed and safety of the natural gas pipeline system, so it is very important to ensure the safety of the gas pipeline. The purpose of the performance test system of gas ratio control valve presented in this paper is to detect the performance of the valve. Due to the high speed and pressurization requirements of the valve and frequent changes in load, the performance of the valve during the commissioning phase must be tested to ensure the safe operation of the pipeline system.
2 System composition
The performance test system of the gas ratio control valve consists of three parts: test platform, pressure tester, and flow meter.
2.1 Test platform
The test platform consists of two parts: external structure and internal structure. The external structure is mainly composed of two platforms. The upper platform consists of two separate platforms, and the lower platform is a closed platform. There are safety baffles on the bottom and sides of the platform to ensure the safety of operation. A unified electrical control cabinet is installed at the side of the platform, and the power supply of the equipment is provided. The internal part of the test platform contains a cylinder, a valve and a pressure gauge, which are connected by pipes to make a valve circuit.
2.2 Zer pressure tester
The zero pressure tester is mainly used to detect the zero pressure of the valve and determine the opening and closing characteristics of the valve. It is composed of a pressure gauge, a pressure support plate, a connection pipe and a pressure transmitter. The pressure gauge is connected to the pipe network to detect the pressure. The pressure support plate is mounted on the inlet side of the valve, the pressure transmitter is connected to the power supply of the pressure gauge, and the two ends of the connection tube are respectively connected to the inlet and outlet parts of the valve body, making the pressure gauge and the two ends of the valve body to maintain a pressure balance.
2.3 Flowmeter
The flow meter is mainly used to measure the flow rate of gases passing through the valve. It is mainly composed of flow guidance device, differential pressure transmitter, connecting pipe, flow meter and RTU. The flow guidance device is installed at the inlet and outlet of the valve and is connected to the pipes in the pipeline. The differential pressure transmitter is connected to the power supply of the pressure gauge, and the connecting pipe is connected to the inlet and outlet of the valve body. Finally, the flow meter and RTU are connected to the differential pressure transmitter to measure the flow rate of the pipeline.
3 Control system
The control system consists of three major subsystems, namely hardware design, software design, and debugging.
3.1 Hardware design
The overall control system is driven by a PC computer. The system input is connected to the PC computer through an A/D card, and the system input and output are connected to the DAQ signal acquisition SWG-1811 card. The output of the signal acquisition card is connected to the valve, pressure tester and differential pressure sensor.
3.2 Software design
The software used to control the system is LABVIEW. The software has the functions of data acquisition, process control and data analysis. The designer sets parameters and conditions through the software interface to meet the requirements of the test.
3.3 Debugging
Firstly, according to the design of the control system, all the wiring is connected in series, and then each component is powered on. After the component is powered on, it is needed to debug the parameters of the component. The debugging process includes three parts:
a. Visual debugging: visual inspection of the internal and external components of the control system and checking whether the system connection is in good condition.
b. Parameter debugging: After all the components are connected, set the relevant parameters of the components according to the actual working conditions of the system.
c. Data acquisition and analysis: After the parameters are debugged, the data acquisition and storage can be carried out. The acquired data can be displayed in the software interface.
4 Conclusion
Based on the design requirements, this performance test system of the gas ratio control valve was developed, which consists of a test platform, a pressure tester and a flow meter. The control system is realized by the LABVIEW system. The hardware design, software design and debugging have been carried out in sequence. Finally, a comprehensive performance test system was built and tested to ensure the accuracy of the experiments.
