The Performance Research And Optimization Design Of Explosion-proof Valve

As an important safety barrier,explosion-proof valves are widely used in ships,petrochemicals,mining and other fields equipped with large diesel engines,but their safety and reliability are often constrained by dynamic instability and insufficient flame retardant performance,causing accidents frequently.At present,the research methods for explosion-proof valves include mathematical modeling,experimental methods and CFD simulation methods at home and abroad,but due to the limitations of the research methods and the coupling of the explosion-proof valve system,the research results are not convincing enough.Therefore,this article used three research methods comprehensively,and built a complete explosion-proof valve system according to the characteristics of the components and research needs.The experimental methods were used to verify,the turbulence model of the explosion-proof valve system research was determined.Then,the principle of opening and closing action was studied by dynamic simulation analysis to analyze the dynamic characteristics of the system.Finally,the flame retardant sheet flow channel structure was optimized for design by using the Latin Hypercube Sampling and the agent model,which improved the performance of the flame trap.The simulation model of the explosion-proof valve system was established.According to the working characteristics and simulation focus of the safety valve system,flame trap system and container system.The safety valve system was mechanically modeled and simplified.The flame trap system was modeled with porous media and equivalent volume,and simplified models were evaluated with fluid force of explosion-proof valve.The mathematical modeling research was selected by container system to define the mechanism of opening and closing.The simulation model reduces the number of computing grids and improves the simulation iteration efficiency,which lays the foundation for the subsequent dynamic characteristics research and optimization design.Turbulence models were verified.The limitations of the working environment of the explosion-proof valve system and the sensitivity of each system to the calculation model were taken into account.The mass flow rate and flow force of disc in multiple valve disc opening positions were calculated using the Fluent simulation platform based on the test results of the safety valve air pressure test bench,combining with the theoretical analysis of commonly used turbulence models in valve simulation process.The evaluation and verification of four commonly used turbulence models were provided to facilitate the iterative calculation of explosion-proof valve systems.Dynamic analysis of explosion-proof valve.The explosion-proof valve with a diameter of 100 mm was regarded as the research object.A two-dimensional grid model,dynamic mesh technology and user-defined function(UDF)were used to define the movement mode of valve disc,to read and write the calculation data completed.And the effect of fluid-solid coupling analysis of the explosion-proof valve system was achieved.Then the action mechanism of the explosion-proof valve in three typical working process was investigated.The structure optimization of flame trap was based on surrogate model.On the basis of the three-dimensional calculation model,Firstly,the Latin Hypercube Sampling was used to complete the experimental design,and CFD simulation technology was used to solve the pressure drop and temperature drop.Then the regression analysis was performed based on the surrogate model.Finally,the genetic algorithm was selected to optimize the structural parameters of the flow channel in flame trap system at explosion-proof valve,and the performance of the flame trap system was improved.