煤泥体积模量测试及在长距离管道输送中的应用∗

摘要

为了实现大流量、长距离煤泥输送管道在电厂锅炉燃烧发电中的应用，解决输送过程中存在的膏体返流和管道冲击振动的问题，采用定义法设计了表征煤泥膏体弹性特征的体积弹性模量的测试装置，并利用该装置对煤泥膏体进行了体积弹性模量测试，研究了压力和质量浓度等参数与煤泥膏体体积弹性模量的关系。对测试装置进行了误差分析，并得出了测试误差随着压力的变化规律，最后对某电厂煤泥管道输送系统进行了返流量预测。结果表明，煤泥膏体体积弹性模量随着其质量浓度的降低而减小，并随着压力呈非线性变化，当压力较小时，体积弹性模量随着压力上升而急剧增大；当压力超过10 MP a时，煤泥膏体体积弹性模量在某一稳定值上下小范围的波动，该稳定值随浓度的变化而变化。%In order to achieve the application of long pipelines with large capacity delivering coal slime pastes in the electric power plant,the problems of reversed flow of pastes and pipeline vibration need to be solved.The test device for finding the main parameter of the coal slime deno-ting the elastic property,the bulk modulus of elasticity was presented by using definition method. The bulk modulus of the coal slime have been tested with this device and the relationship with pa-rameters such as mass concentration and pressure have been studied.Besides,the error analysis of the device has been calculated and the change along with different pressure have been figured. Finally,the amount of reversed flow of the pipelines of the electric power plant delivering coal slime have been predicted.The results showed that the bulk modulus of elasticity decreases with the decline of the mass concentration,while it varies non-linearly along with pressure change. When the pressure was low,it increased rapidly with the raise of the pressure.However,it re-mains stable and fluctuates in a very small range when the pressure exceeded 10 MPa,and the stable value changes along with the change of mass concentration of the coal slime pastes.