SU1019123A1 - Method of automatic control of spray drying process - Google Patents

Abstract

AUTOMATIC CONTROL PROCESS FOR SPRAY DRYING by controlling the moisture of the finished product by affecting the flow rate of the source material and controlling the temperature of the coolant at the inlet to the drying volume by changing the fuel supply, in order to improve the flow rate of the coolant and adjust it on the deviation of the flow rate of the source material from the specified value.

Description

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The invention relates to a drying technique, in particular to the automation of a spray drying process.

There is a known method for automatically controlling the spray drying process by controlling the moisture of the finished product by affecting the flow rate of the source material and controlling the temperature of the heat transfer fluid at the entrance to the drying volume by varying the fuel supply 1.

However, the known method does not provide the required quality control.

The aim of the invention is to improve the quality of control.

The goal is achieved by the fact that according to the method of automatic control of the spray drying process by controlling the moisture of the finished product by affecting the flow rate of the source material and controlling the temperature of the coolant at the inlet to the drying volume by changing the fuel supply, additionally stabilize the flow rate of the coolant and adjust its temperature by the deviation of the flow rate of the source material from given value.

The drawing shows a block diagram of a device that implements the proposed method.

The device contains a unit 1 for measuring the humidity of the product, a dryer 2, a regulator 3 for the humidity of the product, an actuator 4, a sensor 5 for the coolant flow rate, and a regulator 6 for the coolant flow rate.

actuator 7, furnace 8, suspension flow sensor 9, suspension flow controller 10, heat carrier temperature controller 11, heat carrier temperature sensor 12, actuator 13.

The device works in the following way. When the humidity of the product coming out of the dryer is increased, which may be caused, for example, by an increase in the humidity entering the suspension dryer, the controller 3 by means of the actuator 4 reduces the consumption of the suspension. This leads to a deviation of the flow rate from the predetermined value, in connection with which the signal at the output of the regulator 10 increases, the adjustment of the task to the coolant temperature controller 11 is adjusted. The regulator 11 through the actuator 13 increases the fuel supply to the furnace 8. The resulting increase in the temperature of the coolant leads to a decrease in the moisture content of the product and an increase in the supply of the suspension due to the operation of the regulator 3 and the actuator 4. The temperature increases until the flow of the suspension at the entrance to the dryer will not reach the specified

5 values. When moisture decreases, the system operates in reverse order.

The proposed method of controlling the drying process in comparison with the known ones will allow improving the controllability of the object and, as a result, improving the quality of control.

Claims (1)

METHOD OF AUTOMATIC CONTROL OF THE SPRAYING PROCESS OF DRYING by adjusting the humidity of the finished product by affecting the flow rate of the starting material and adjusting the temperature of the coolant at the inlet to the drying volume by changing the fuel supply, characterized in that, in order to improve the quality of control of the drying process, they further stabilize the flow of the coolant and adjust its temperature by the deviation of the consumption of the source material from the set value.