SU1469264A1 - Method of controlling granular material drying in tumble drier - Google Patents

Abstract

The invention relates to the field of automation of drying equipment. The purpose of the invention is to improve efficiency. The flow rate and humidity of the source material, the waste gas t and the fuel consumption are measured by the difference between the target and the actual amount of evaporated moisture. Additionally, the sensor 19 t-measures measure the t-ru of the dried material and taking into account the temperature of the exhaust gases, which is measured by the sensor 20 t-ry, the moisture content of the dried material is determined. In terms of flow rate and moisture of the source material, which are measured respectively by sensors 21 and 22, as well as the humidity of the dried material, the actual amount of evaporated moisture is judged. The method allows to reduce fuel consumption, to calculate the change in material consumption, which ensures the specified quality of the dried material based on humidity. 1 il. with S (/)

Description

The primary air flow rate measured by the sensor 6, with the help of the actuator 8 and the regulator 9, is varied by the regulator 7 depending on the signal from the fuel consumption sensor 5.

The secondary air flow rate measured by sensor 10 through controller 12, actuator 13 and regulator 14 varies depending on the signal from sensor 11 of temperature in mixing chamber 3.

-0,0004-T -T -0.3081 °,

where W is the actual moisture content of the dried material,%; T is the temperature of the dried material, C; waste gas temperature

WITH.

When drying other materials, the general form of equation (1) is preserved, only the numerical values of the coefficients and the constant terms of the equation, which can be experimentally refined, change.

It can be seen from equation (1) that the main parameter of the drying process is the moisture content of the dried material, determined by its temperature and temperature of the waste gases. The signal on the temperature of the dried material is a signal from the sensor of direct contact with the material, which excludes the direct use of moisture meters, the operation of which at the outlet of the dryers is difficult due to higher temperatures.

The dependence found (1) also includes the temperature of the flue gases, the change of which (without delay for the time of transport delay of the material) allows to judge about the deviation of the scientific research institute of the process from the normal mode.

The actual and specified amount of evaporated moisture is determined by the material balance equation:

4, Too-w -

(2)

where F 5vd, - the actual (specified) value of the amount of evaporated moisture, t / h; Q, is the consumption of the source material, t / h; . W is the humidity of the initial MF (for the material,%; W is the actual (specified) moisture of the dried material,%.

From the difference between the actual and specified values of the amount of evaporated moisture, the change in fuel consumption is calculated.

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It should be noted that for the sake of control, it allows regulation (with a fixed fuel consumption) by changing the flow rate of the starting material. At the same time, in the computational device 23, by comparing the actual and specified quantities of evaporated moisture, the change in material consumption is calculated, which ensures the specified quality of the dried material by. humidity. The signal from the computing device 23 for this goes through the source material flow actuator 26 to its regulator 27, which changes the flow rate of the source material up and down until the actual amount of evaporated moisture is equal to the specified one.

Claims (1)

The invention The method of controlling the process of drying bulk materials in a drum dryer By measuring the flow rate and moisture of the source material, the temperature of the flue gases and the change in fuel consumption by the difference between the desired and the actual amount of evaporated moisture, which is so as to increase efficiency by reducing fuel consumption, the temperature of the dried material is additionally measured and, taking into account the temperature of the exhaust gases, the humidity of the dried material is determined, and the actual amount ve vaporized moisture is judged by the flow rate and humidity of the starting material, and the moisture of the dried material.