Research On Solid Flow Rate Of Catalytic Cracking Catalysts By Heat Transfer

Solid flow measurement of gas-solid two-phase flow of catalytic cracking catalysts in perpendicular duct was studied using heat transfer measurement with a home design-made heat transfer probe.The distribution law of temperature in probe radial was researched by putting heat transfer probe into duct, and the temperature influence radius of probe was calculated by MATLAB. The result shows that there surely existed a probe temperature influence area in probe radial, and the temperature influence radius of probe that calculated by MATLAB was agreed with experiment'.The influence laws of probe heating power, solid phase rate of flow, wind speed, duct density etc. on the temperature influence radius of probe and heat transfer coefficient were studied in riser. Based on the laws, one model of solid flow-rate was founded by developing relation of thermal balance around probe and tested. The results of experiments and model checking show that the influence radius of probe was decreased with solid phase rate of flow or duct density increasing, but have nothing with probe heating power or wind speed; heat transfer coefficient increased with probe heating power, solid phase rate of flow, wind speed, duct density increasing. Value of calculated by measure model and experiment'had good agreement high accuracy.In the self-made L-valve, stable running conditions were confirmed by seeing about the influence factors on the capability of L-valve. Based on the conditions, the influences on the temperature influence radius of probe and heat transfer coefficient were studied by measured the temperature of probe and in the probe radial. And one model of solid flow-rate was founded and tested. The results of experiments show that the temperature influence radius of probe increased with probe heating power, solid phase rate of flow increasing, increased with duct density to a numerical value and no longer changed; heat transfer coefficient increased with solid phase rate of flow, duct density increasing, but decreased with probe heating power, wind speed increasing. The solid-phase flow downstream bed measurement model arrived a preferably purpose which based on the relation of thermal balance.