Study On Wear-resistant Material Erosion Wear Characteristics And Numerical Prediction Of Black Water Regulating Valve

In this paper,in view of the serious erosion wear of the coal chemical blackwater regulating valve,two aspects of the material performance and the structure flow field are discussed and analyzed.A continuous high temperature and high speed gas solid erosion experimental device was used to wear the Ni WC35 and WC two kinds of materials.The contour curve of the erosion pit was obtained by using the ultra high speed laser profiler.The microscopic wear morphology of the material was observed by scanning electron microscope,and the wear resistance of the material under different abrasive volume,temperature and impact angle was analyzed.The Aspen chemical process software is used to calculate the flash steam process of the black water valve.The gas liquid phase fraction obtained as the Fluent flow field was used to calculate the boundary conditions.Using evaporation condensation model and discrete phase model to calculate the flow field and the realtime flash wear rate distribution.The calculation results are well compared with the actual failure cases.The prediction method can be used to guide the design and selection of the pipe valves in the black water valve and the solid transportation field,and to significantly reduce the research and development costThe main content of the research can be summarized as follows:1.The experimental installation of continuous high temperature and high speed gas solid erosion can meet the requirements of wear resistance research.The impact speed of the abrasive particles can reach 180m/s,and the wear resistance can be accelerated.The feed control system ensures the stability of abrasive mass flow well,and can carry out high-temperature experiments on materials at temperatures above 500?.2.Two kinds of materials are increased with the amount of abrasive wear significantly,NiWC35 than WC more than 7 times larger in the erosion pit depth.The experimental temperature has great effect on the NiWC35,and the effect on the WC is relatively small.When the impact angle of tilt,NiWC35 to pit depth and radius are extended,while WC only to expand on the crater radius.3.The experiment section is simulated and analyzed by the wear model modified by experimental data.The calculated surface wear rate of the specimen is in good agreement with the shape of the experimental pit,and the contour curve is also approximately consistent.4.Blackwater valve erosion distribution and flash flow are highly relevant.When opening in the normal 40%,the larger and concentrated flow impact on the buffer tank bottom.Whoever,opening in the extreme 10%,flash occur in advance of solid flow into the Venturi tube,easy to make written venturi tube wall sheet wear and local thinning.5.The modified erosion wear prediction method is used to analyze the improved black water valve,which shows that the spindle structure design of the valve core has a stable pressure effect.The maximum position of wear is transferred to the lower part of the adjusting part of the valve core,so that the regulating function of the valve is protected.When the solid flow enters the Venturi tube,it is fully dissipated,and the wear of the wall of the Venturi tube and the buffer tank has also been obviously relieved.