Study On Numerical Simulation And Test Of Gas Regulator

The 21 century is the high speed develop period of natural gas industry in the world, at the same time it is the rise and tend towards maturity period of natural gas industry of China. Gas projects are developing impetuously in China now, the requirement for gas equipment will increase as a result of engineering expand. Gas regulator is one of the important equipment in the gas distribution system which can control the outlet pressure in a set range automatically to hold the gas pressure normal when the system state of supply and demand is changed. Moreover, it usually has the function of protection. Presently, gas regulator of high quality is seldom made in China, it is heavy required but low independence and few study. It is unsuitable to meet the need of the rapid developing of gas projects in our country. Enhancing the work of mechanism analyze and design investigation of gas regulator is very important to produce the high quality equipment and developing gas project of our country and investment saving. The study object in this paper is the regulate characteristic testing system of the RTZ-21/50FS(Q) gas regulator which independence design. The technique of gas regulator numerical simulation is work out with three dimensions geometry modeling, meshing, numerical simulating of a series of inlet pressure and orifice open extent, gained the pressure regulate characteristic simulation curve of the RTZ-21/50FS(Q) gas regulator by mechanics analyze on stem.The intention of gas regulator numerical simulation is obtain it's regulate characteristic data, namely regulate characteristic, before the equipment is manufactured. Base on it, the disadvantage of design can be found out, accordingly, improve design can be processed pertinently or forecast the result of improve design to avoid the waste of develop time and outlay which come from manufactured sample equipment time after time with experience only. The study object of gas regulator numerical simulation is the regulate characteristic testing system of the sample equipment, a part of it is decided as the numerical simulation area. After appropriately simplify, it is geometry modeling, the three dimensions geometry model of gas regulator numerical simulation is created.The three dimensions geometry model of gas regulator is imported in the CFD professional preliminary treatment software, geometry model of a series of orifice open extent are created and then gas flow space are constructed. According as the characteristic of every part, it is meshing after chosen suitable meshing arithmetic and boundary setting. Last, the mesh is export.The mesh is imported in FLUENT, the CFD professional software, it is setting that the suitable solution format, flow model, fluid property and boundary condition. The gas flow is numerical simulated at a series of orifice open extent,several inlet pressure and different flux, then gained the gas regulator working parameter of various status. The key part's mathematics model of the gas regulator is established, by mechanics analyze on stem and adjust status many group work point that the stem stand in mechanical balance. The flux characteristic curve of the gas regulator is constituted.The disadvantage of the gas regulator's pressure regulate characteristic is detected by analyze the flux characteristic simulation curve. Accordingly, improve design and reset is processed pertinently before simulating in turn. Through compare the pressure regulate characteristic simulation curves, the result of improve design and reset is forecast. According to the international standard involved, the characteristic testing system of the RTZ-21/50FS(Q) gas regulator is established. The sample equipment is tested on pressure regulate characteristic. The curve of flux characteristic which simulated and tested is compared. It is analyzed the numerical simulation error causation and the way to reduce it.