RATIONALE OF SYSTEM OF STABILIZATION THE HEAT FLOW FOR GRAIN DRYERS OF MINE TYPE
On the basis of experimental data the analysis of dynamics of processes of regulation of thermal regimes in dryers with a gravitational moving layer is made. As the object of control, the dryer is a difficult dynamic system. This is the multiply connected, the distributed dynamical object with considerable inertia and with transport lag. Its static characteristics are nonlinear. It is established, that the humidity and velocity of the grain layer affect its aerodynamic resistance. In the manufacturing conditions, their changing excite considerable fluctuation of the gas flow and the heat in the camera of dryer, leading to fluctuations in the temperature of grain. In this connection, it is established that stabilization of temperature of the heat carrier does not provide stabilization of temperature of grain. For the best stabilization of regimes, the system of regulation of amount of heat in the camera of dryer is offered. The system includes a control loop of temperature and a control loop of speed of gas, whose works provide stabilization of heat flow.