Analysis Of Pressure Signal In Suspended Preheating System Under Collapse Condition

Suspension pre-heating and pre-decomposition is the core technology of new dry process cement production.Over the years,cement technicians have continuously optimized it,but the frequent collapse of the suspension pre-heating system has always hindered the further development of this technology.In order to accelerate the development of suspension preheating and pre-decomposition technology,this subject studied the fluctuation of pressure signal,the characterization of the collapse period and the calculation of the collapse amount under the collapse condition of the suspension preheat system.In this subject,a cold-stage simulation platform for a single-stage cyclone of a suspension preheating system was built.Large-scale materials were used in a two-dimensional vertical heat exchange tube to simulate the collapse condition caused by particle agglomeration.The heat pipe axial pressure signals A,B,and C were analyzed using statistical methods and power spectrum methods.The results showed that:(1)The effective signal in the pressure signal under the collapse condition is mostly concentrated in the low-frequency part.By comparing the noise reduction effects of different wavelet parameters,it was obtained that when the heursure threshold rule and sym5 wavelet were used for 3 layers of decomposition,the signal-to-noise ratio SNR is 68.13,and RMSE is 1.49,denoising effect was the best;(2)(1)Under normal operating conditions,the average negative pressure at point C of the heat exchanger tube was-68.27 Pa;when the material collapse condition occured at a rate of 0.1Hz,the pressure signal fluctuates significantly,and the negative pressure at point C increased to-113.6 Pa,the standard deviation increased from 3.47 to 8.43;(2)Under the collapse condition,the frequency of artificially controlled collapse was 0.1,0.05,and 0.03 Hz,respectively.After the power spectrum analysis,it was successfully detected that the heat exchange tube was under different collapse frequencies.There were material collapse signals at three points at frequencies of 0.102,0.048,0.034 Hz,which were basically consistent with the experimental set frequency.This method successfully identified the collapse conditions and characterized the frequency of collapse.(3)Through theoretical analysis of the gas-solid two-phase movement in the heat exchange tube,the article deduced a set of characterization algorithm for the amount of collapsed material,and verified that the algorithm has good predictability through data and the average of the real value and calculated value The relative error was 4.69%.The construction of the algorithm provided a certain guidance for the method of predicting the amount of collapsed material in the suspension preheating system in the actual production of cement.In addition,this subject conducted a preliminary exploration of height of material dispersion in the heat exchange tube under the collapse material condition.The article used the pressure drop of the heat exchange tube,the wind speed of the cross section,the quality of the collapsed material and height of material dispersion to analyze the design of the material by the response surface analysis software,and predicted the height of material dispersion,Mathematical model between the pressure drop in the tube.