Prediction model for bulk elastic modulus of highly concentrated viscous pastes
High concentration viscous paste pipeline conveying is developing towards high pressure,large concentration,long distance,and large diameter.However,as the conveying distance and pumping pressure increase,the conveying system will have serious material reflux and the violent vibration of pipeline.All the above problems are affected by the elastic recovery of high-concentration viscous paste in the long-distance conveying system after pressure,which is related to the bulk elastic modulus of high-concentration viscous paste.In order to establish the prediction model of the bulk elastic modulus of highly concentrated viscous paste,the experimental device of bulk elas-tic modulus of coal slurry paste was designed by definition method.Also the error analysis of the experimental device was carried out to study the single-factor influence law of pressure,ambient temperature and gas content on bulk elas-tic modulus.It was found that the bulk elastic modulus of coal slurry paste decreases with the increase of ambient tem-perature and gas content under the same pressure,and it changes nonlinearly with the pressure.When the pressure is low,the bulk elastic modulus increases sharply with the rise of pressure.When the pressure exceeds a certain value,the bulk elastic modulus tends to be stable.When the pressure continues to increase beyond a certain limit,its value will continue to increase.Through regression analysis,in the compression stage of coal slurry paste based on the above theoretical analysis,the correction coefficients for the bulk elastic modulus of coal slurry paste at any pressure in the compression stage are proposed,and the bulk elastic modulus model is given for any pressure and different am-bient temperatures and gas contents.The deviation between the predicted and experimental values of coal slurry paste was calculated,and the deviation is below 3%in most of the compression stages,which can realize the accurate predic-tion of the bulk elastic modulus.
high concentration viscous pastebulk modulus of elasticitypipeline transportgas contentambient tem-peraturelinear regression
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