SU1272077A1 - Method for controlling manufacturing process in fluidized bed apparaus - Google Patents

Abstract

The invention relates to metallurgy and can be used to control technological processes in apparatus with a KIPNYM.IM layer. The purpose of the invention is to increase the yield of the finished product. The control method consists in changing the flow of blowing and regulating the ratio of the EPI between the solid material and the gas supplied to the apparatus by the difference of temperatures of the firing gas and the fluidized bed. According to the invention, the value of the fluidization quality parameter is additionally determined and the sign of its time derivative is compared, the quality parameter value is compared with the minimum allowable value, and with a negative deviation the feed rate is increased, with a positive time derivative value the feed rate is continued to increase until the quality parameter value will reach the minimum acceptable value, with a negative (L value of the derivative, reduce the flow to blow as long as Quality Parameters equals the minimum allowable value. 1 yl.

Description

YU

Yu

about

The invention relates to metallurgy, chemical technology and can be used for controlling technological processes in boilers.

The aim of the invention is to increase the yield of the finished product.

The drawing shows a diagram of an apparatus for implementing a process control method in a fluidized bed apparatus, in which calcination, extrusion, incineration can be carried out.

The circuit contains sensor 1, measuring the absolute value and pulsations of the layer porosity, sensor 2, measuring the temperature pulsations of the layer, block 3 determining the value of the fluidization quality parameter, comparing device 4, device 5, setting the minimum acceptable value of the fluidization quality parameter, switching device 6 contact groups 7 of the switching device, block 8 for calculating the time derivative of the fluidization quality parameter, feed actuator 9 to blow into the device, sensors 10 and 11 temperature s, device 12 calculates of a difference of signals from the sensors 10 and 11, controller 13, feed rate of the solids in the layer, the prohibition unit 14, an actuator 15 in the feed apparatus.

Block 6 is the set of input and output relays, and block 8 is the usual differentiator.

The signals from sensors 1 and 2, measuring the absolute value of the porosity, temperature pulsation and porosity, go to block 9 to determine the value of the fluidization quality parameter using the formula

and (-) .Wg

 2Je: / L

where is the average porosity of the layer of material;

g - free fall acceleration,

L-minimum size of the layer of material, m;

Jf - fluidization quality. The obtained parameter value is compared in the device 4 with the minimum allowable value received from the setting device 5. The device 4 calculates the difference between the current and the specified value of the nonslimate quality parameter. The difference signal enters the switching device 6 and if the difference is negative, then the switching device 6 issues a command to the actuator 9 to increase the feed blow. At the same time, the device 6 with its contact group 7 connects to the output of block 3 a block 8 for calculating the time derivative of the fluidization quality parameter. Along with this, the switching device 6 issues a command to the block 14 of the ban on disabling the regulator 13 from the actuator b

raw materials, i.e. when the value of the fluidization quality parameter is less than the specified one, the feedstock feed regulation is not performed - the raw material supply remains as it was at the time of the negative deviation of the fluidization quality parameter from the specified one.

As the feed increases, the value of the time derivative of the fluidization quality parameter appears, a signal proportional to the time derivative appears at the output of block 8, and if the signal is positive, then device 6 continues to give a signal to the actuator 9 to increase the feed blow

if the signal at the output of the device 8 is negative, then the switching device b gives a signal to the actuator 9 to reduce the supply to blow. Simultaneously with the appearance of a signal derived from the parameter, device 6 disconnects using contact group 7 block 8 from block 3, since the derivative sign is determined. Continuing to change the pitch, the blow (decrease or increase) stops until the difference between the current and

The 5 minimum acceptable values for the fluidization quality parameter will not be zero.

In such a case, the switching device 6 will remove the signal from the device 9, the change in the feed blow will stop. At the same time, the device 6 will remove the signal from the prohibition unit 14, the controller 13 is connected to the raw material supply actuator 15. The regulation of the process is carried out by changing the feedstock feed to the apparatus. The signals from the sensors 10 and 11. Measuring temperatures are fed to the device 12 for calculating the temperature difference, the difference signal is sent to the controller 13 and then through the prohibition unit 14 to the raw material actuator 15. If the temperature difference is lower than the specified one, then the raw material feed is increased, if the difference in temperature. The temperature is higher than the specified one, then the raw material load is reduced. If the value of the off-liquefaction quality parameter becomes less than the set (minimum acceptable) value, then the hogulation process is repeated.

The advantage of the invention B.I / -and ... h improving the quality of management;; SC; the fact that the control takes into account the mode of motion and grinding of particles in

Q device, which allows to increase the yield of the finished product, the time of overhaul of installations, and thereby improve the technical and economic performance of industrial devices.

Claims (1)

5 Formula of Invention A process control method in an apparatus with a boiling layer, including a change in the flow of blowing and controlling the ratio between the solid material supplied to the apparatus and the gas according to the difference in temperature of the firing gas and the fluidized bed, characterized in that product, determine the value of the quality parameter of fluidization, and the sign of its time derivative, compare the value of the quality parameter with the minimum acceptable value, and with a negative the deviation increases the flow rate; with a positive value of the time derivative, the flow rate continues to increase; until the value of the fluidization quality parameter reaches the minimum acceptable value; if the value of the derivative is negative, the flow rate decreases until the value of the fluidization quality parameter becomes equal to the minimum acceptable value. Raw material