SU1171656A1 - Method of automatic control for process of drying - Google Patents

Abstract

The method of automatic control of the drying process includes measuring the moisture of the spent drying agent and changing the flow rate of the drying agent at the entrance to the material layer, characterized in that, in order to reduce energy consumption, the humidity of the drying agent at the entrance of the material layer consumed by the fan’s power is also measured, The temperature and flow rate of heating steam determine the power per unit of moisture to be removed according to the measured parameters, depending on which the flow rate of the essential agent is changed.

Description

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The invention relates to the field of automation of technological processes, in particular to the automation of the drying process.

The purpose of the invention is to reduce energy consumption.

The drawing shows a diagram of the device, explaining the implementation of the method.

The device is {(contains a drying chamber 1, kaLo {zi ||| ep 2, a fan 3 with an adjustable drive,: an extreme controller 4, an actuator 5, line 6. Preparation of the drying agent, a flow sensor 7) , the temperature sensor 8 is greyush, its steam, the humidity sensor 9 and 10 of the drying agent, the device 11 for measuring the power consumption of the fan.

The method is implemented as follows.

Using sensors 7 and 8 and the device 11, information on the actual consumption of heat and electric energy is transmitted to the extreme controller 4, which generates a signal deflecting the flow rate of the drying agent from the extremum and acts through the actuator 5 on the number of revolutions of the fan providing the change in consumption of the drying agent . By means of sensors 9 and 10, information on the amount of evaporated moisture is also continuously transmitted to the extreme controller 4.

In the process of controlling the minimization, the total consumption of heat and electric energy per unit of moisture removed is subject to the restrictions on the amount of dried product, the value of which

E (1

piX8bixT: .j5 Hal

where E is the consumption of heat and electricity

energy, j;

V is the amount of moisture to be removed, kg; I is the consumed current of the fan, J y / is the temperature and speed of the actual agent, K ,;

XkLch-- respectively the moisture content of the drying agent at the inlet and outlet of the layer of material, kg / kg; “B a; fiij a-normalization factors. When controlling the drying process, changing the speed W, maintains the consumption of the drying agent corresponding to the minimum of expression (1).

Claims (1)

METHOD OF AUTOMATIC DRYING PROCESS CONTROL comprising measuring the moisture content of the spent drying agent and changing the consumption of the drying agent at the inlet to the material layer, characterized in that, in order to reduce energy consumption, the humidity of the drying agent at the entrance to the material layer is additionally measured, the fan power consumption, temperature and heating steam consumption , the measured parameters determine the power per unit of moisture removed, depending on which the flow rate of the drying agent is changed.