Design And Implementation Of Natural Gas Flow Meter System Based On Wince

Measurement of natural gas flow is an important technical foundation work, and it’s a key factor that affects the development of the natural gas industry. Flow meter is responsible for the pipeline gas flow measurement, which undertakes the most basic measuring and managing work in flow measurement system. Thus it’s very important to ensure the flow meter running stably and measuring accurately. In order to meet real-time and reliability requirements of gas flow measurement, developing a flow meter owning high stability and performance has import practical significance. The project is from ChengDu GuoGuang Electronic Instrument Co. Ltd., and a real-time and reliable flow meter is developed.The flow meter designed and developed is applied in measurement of natural gas flow by means of standard orifice plate meter. Based on the analysis and study of flow calculation method of orifice plate meter flow, the process of calculating natural gas compression factor is optimized, which reduces the time consuming of flow calculation greatly and makes it possible for real-time flow calculation on the embedded system. According to the technical requirements of the natural gas metering system and combined with practical application, the overall architecture of the system is established. After the analysis of the features of the hardware platform VP-25W1 and WINCE operating system, the analysis and design of software architecture for the system are completed, and a multi-threaded system with a linear working logic is designed. For the system requirements, an efficient internal register system is designed and implemented, which optimizes data processing and improves system performance. The software of flow meter is developed by C# and runs in.NET CF environment. The software is built on the main working thread, which periodically performs data acquisition, flow calculation, data storage, display refresh and other works. The accuracy of the measurement is ensured by highly accurate flow calculations and real-time execution. The system uses front compensation algorithm to finished flow compensation work. An efficient and reliable data storage management system is developed based on SQLite database, which manages system operation parameters, historical data and system events. Modbus TCP server and TCP server provides real-time flow data and historical flow data to the monitoring center respectively. Monitoring software is developed, which can view real-time data and historical data, and have parameter settings, meter status changing and other functions. The flow meter has good scalability and ability of secondary development.A flow meter is designed and developed, which is capable of real-time data acquisition, flow calculation, dynamic display, parameter setting, system clock check, data upload. The flow meter meets the automation, intelligent and networking requirements. The work done in the thesis provides a direction for the designing and development of natural gas flow metering equipment.