超细煤粉-水-渣油三元混合燃料的流变行为研究

Research on Rheological Behaviour of Pulverized Coal Particles, Water and Residual Oil Triplex Synfuel

使用适当的分散剂和乳化剂制备出两种超细煤粉、水、渣油三元混合燃料 (O/W型和W/O型 ) .水基混合燃料的组成为m油∶m煤∶m水 =4∶2∶4,油基混合燃料的组成为m油∶m煤∶m水 =5∶2∶3.流变行为的研究结果发现水基混合燃料的流变特性符合Herschel-Bulkley模型 ,而油基混合燃料的流变特性符合Bingham模型 .两种混合体系粘度的温度依赖关系符合Arrhenius等式 ,水基混合体系的流动活化能为 16 16kJ/mol,而油基混合体系的流动活化能为 71 5 3kJ/mol,两种混合体系活化能数值的差别来源于混合体系的外相介质效应 .混合体系活化能比其外相介质活化能的高出部分来源于混合体系的结构效应 ,并提出了以下等式来描述混合体系的粘温关系 :η =Aexp[(E+S) /RT].

Water_based and oil_basd synfuels composed of residual oil, pulverized coal and water have been prepared to investigate their rheological properties. For water_based synfuel, the ratio of the components is O∶C∶W=4∶2∶4, and for oil_based synfuel O∶C∶W=5∶2∶3. It has been found that the rheological properties of water_based synfuel coincides with Herschel_Bulkley model, whereas the rheological properties of oil_based synfuel with Bingham model. An investigation of temperature dependence of their viscosities shows that both synfuels are in accordance with Arrhenius equation, water_based synfuel has a flow activation energy of 16 16?kJ, whereas the oil_based synfuel has a flow activation energy of 71 53?kJ. This difference is attributed to the medium effect. The excess part of flow activation energy is suggested to be the structural effect, and an equation η=A?exp[(E+S)/RT] has been proposed.