Research On Cooling Control Model Of Grate Cooler Clinker Based On Three Dimentional Reconstruction

The core issue of the cement industry which is needed to be solved at home and abroad is that improving the energy recovery of the cement production process in order to reduce the ton energy consumption of cement. The cooling efficiency of grate cooler clinker has vital significance for the quality and heat recovery of the cement. The heat recovery efficiency is directly determined by the cooling control technology of grate cooler clinker. The establishment of an accurate cooling control model is the precondition of improving the coolling techonology, and the key of saving energy sources in order to develop of green cement. In this paper the research object is the heat-exchange system of grate cooler. Researching characteristics issue of reconstruction, grid partition, and as solid heat transfer in the three dimension, the three dimensional network control model is established under the flow state of clinker. The accuracy of the control model is verified through the experiments. Specific tasks include:Research on the flow characteristics of the clinker and the air in the cooling process of the grate cooler clinker, the three dimensional reconstruction is done to the clinker based on the technology of binocular vision. Subline matching method based on binary system small wave transform is proposed which use the matching scheme from thick to thin for point matching. Simulation results show that the method has better accuracy and speed, and the three-dimensional shape of the clinker after the reconstruction meet the need for further analysis.The three dimensional mesh generation encryption rule is proposed based on the geometry characteristics and the physical characteristics. The auto-adapted mesh generation algorithm of clinker is designed, the evaluations of which are the clinker particles, temperature, thickness and chang rate of cooling air volume. The best node is selected based on the earlier period processing of encryption, regional points according to the node encryption rule. Then the three dimensional mesh is generated automatically, and carries on the local encryption to the characteristic area.According to heat transfer theory and the hydrodynamics principle, based on the auto-adapted mesh generation model, this paper studies the heat transfer characteristics under the state of cooling and flow, analysises the influence of clinker thickness and the pellet diameter undulation to the heat transfer. According to the research of two phase currents pellets stress, the dynamics model is established in the state of the pellet collision. And comparing the simulation of clinker particle trajectories and the experiment platform to verify the accuracy of the model.The grid node thermal equilibrium equation that encompasses the clinker heat transfer information is established based on the research on the mathematical relation of grate cooler clinker temperature field and the cooling air volume, the clinker velocity of movement, and the clinker thickness. The multi-phases clinker cooling temperature model is obtained through the research of cooling control mechanism. The inner link between the characteristic parameters of the clinker cooling process have been found after the indepth study of the temperature drop model that is caused by the counter-flow heat transfer and the radiation heat transfer of the clinker grid unit. Then the three dimensional network control model of cooling clinker is established. Analysing the experiment of the control model, the results verify the accuracy of the control model.