The boiling bed dryer uses room temperature air flow to suspend plastic particles, and through fluidized boiling, there is an effective heat exchange between plastic particles and air flow. This equipment is particularly effective for plastic pellets extruded from 200 high temperatures, but still more than 100 when they enter the boiling bed. It uses the principle of heat exchange to quickly take away the evaporated moisture on the surface of plastic particles, so as to achieve rapid drying and cooling effect, and effectively prevent the plastic particles from sticking after vacuum packaging.
In the operation of an ebullated bed dryer, the suspension height of the plastic pellets is a critical process parameter. Suspension heights that are too high or too low can affect the continuity and efficiency of production. If the suspension height is too high, the number of plastic particles in the bed will be reduced, resulting in reduced production efficiency;However, if the suspension height is too low, there are too many plastic particles in the bed, which may hinder the air flow at room temperature to fully carry away the water vapor.
There are several main factors that affect the suspension height of plastic particles: the opening of the infeed and discharge valves, the flow rate and pressure of the ambient air flow that suspends the plastic particles, and the weight and shape differences of the plastic particles themselves. Currently, most ebullated bed dryers still rely on manual observation to adjust these parameters, making operation time-consuming and laborious, and difficult to maintain stable control. Although some devices use sensors to detect the levitation height of plastic particles, the sensor may misjudge the weight or shape of the plastic particles, resulting in inaccurate detection, which can affect the accuracy of the control.
Therefore, optimizing the control strategy and sensor technology of the ebullated bed dryer is the key to improving production efficiency and product quality. By more precisely controlling the suspension height of the plastic pellets, the performance of the ebullated bed dryer can be further improved, increasing its stability and efficiency in continuous production.