Design Of Data Acquisition And Processing System On The Experiment Device Of Natural Gas Hydrates In Permafrost Zones

Natural gas hydrate is a kind of new energy.It has important development value. Although China is the third largest permafrost country in the world, the development on natural gas hydrate in frozen zones is still in the experimental stage. Through the experimental apparatus for frozen natural gas hydrate study we can make some physical and chemical analysis before exploration. It can also provide theory foundation and technology support for the industrial development of frozen natural gas hydrate.In this paper, a data acquisition and processing system is designed for the experiments of frozen natural gas hydrate. This paper mainly studies software and hardware design and related debugging and experiment o f this system. This set of experimental equipment aims for simulating the hydrate formation and exploitation process in fractured porous media. It is especially designed for the CO2/N2 replacement mining experiment. And it can also be applied in the depressurization mining and hot mining experiments. Firstly, this paper introduces the study status of the natural gas hydrate. O ne is methods of synthesis, extraction and detection of the natural gas hydrate, the other one is study status of experimental simulation device at home and abroad. Secondly, the design scheme of this device is introduced. In this device, modularization method is adopted and all the modules are independent and also related. Thirdly, this paper introduces the design of this data acquisit ion system. It mainly includes its function, principle and realization, the instrument type selection and the design of configuration software programming. It is possible to communication between devices, display changes of parameters and graph in real time, generate data report and data file for query by users. Fourthly, the debugging and experiment of this device are introduced, such as sensors(temperature, pressure, voltage, current), data acquisition module, temperature simulation unit and so on. Connection of the temperature measuring lines caused the temperature higher than the actual temperature. Temperature compensation in software solves this problem. The plate electrodes are corroded easily in DC yard. Using positive and negative power as the excitation source of the plate electrodes solves this problem. Then through a simple generation experiment test of CO2 hydrates, CO2 hydrates are obtained and the data of temperature and pressure in the reactor are collected. It proves that this data acquisition and processing is effective and the measurement is accurate. Finally, the shortcomings in the research are pointed out, as well as the future research prospects.