Modelling of heating and cooling dynamics of grain products in pneumatic mode

Abstract

The ability to heat treatment of disperse materials that move in a continuous-flow gas stream is known. Heat transfer in a moving gas stream has a high intensity heat transfer from the coolant gas to the material, and vice versa from the heated material to the air-cooled. However, the absence of a reliable mathematical model that reflects the dynamics of heat transfer in distributed parameter objects, does not allow to determine the rational parameters and modes of such plants, hinders the development of control systems. To address this issue in the article the mathematical model of heating of grain in the air conveyor conditions, taking into account parameters of the distribution. The basis for the model selected heat balance equation, which can describe the processes of convective heat transfer to the selected pipe element. These equations determine the distribution of the coolant temperature and grain length pnevmotrakta for any time. This novelty is the possibility of one equation to determine the transition process to actually distributed object. The result of the article is to establish mathematical relationships and changes in grain temperature of coolant at a continuous-flow movement in pnevmokanale height and time. The resulting dynamic model of heat exchange with the coolant grain can be used for the development of control systems heating process that greatly enhance its effectiveness.