SU767495A1 - Apparatus for controlling roasting process of raw mixture in rotary kiln - Google Patents

Description

(54) DEVICE FOR CONTROLLING THE PROCESS OF GRINDING RAW MATERIALS IN A ROTATING KILN

one

The invention relates to the production of building materials, namely, devices for controlling the burning process in rotary kilns.

A device for controlling the burning process of a raw meal is known, comprising a feed mixture flow controller, a fuel flow controller, sensors for the temperature of the raw mixture and exhaust gases 1.

A disadvantage of this device is its high fuel consumption and low furnace productivity.

It is also known a device for controlling the firing process of a raw mix in a rotary kiln, comprising a drive engine, a fuel flow controller, a feed mixture flow controller with an actuator, an exhaust gas temperature sensor, a material temperature sensor, a correction controller, a waste gas flow controller. gases and associated actuators 2.

A disadvantage of this device is the low productivity of the furnace, since the supply of the raw mix does not depend on the furnace load, fuel consumption and engine drive load.

The purpose of the invention is to increase the reliability of the device.

The goal is achieved by the fact that a device for controlling the roasting of the raw mix in a rotary kiln, containing the drive motor, the regulator

 fuel consumption, the flow controller of the raw mix with the actuator, the flue gas temperature sensor, the material temperature sensor, the corrective regulator, the waste gas flow regulator and the corresponding actuators, the material temperature sensor through the corrective regulator connected to the first input waste gas flow controller, the second inlet of which is connected to a temperature sensor

15 off-gases, equipped with a fuel consumption sensor, a raw material consumption sensor, a furnace rotation speed sensor, an engine torque sensor, an additional correction controller and a furnace speed controller with an engine control for the drive engine, the fuel consumption sensor being connected to the controller fuel consumption, connected to one appropriate actuator, the rotation speed sensor of the furnace is connected to the first input of the feed mixture flow controller, the second input of which is connected The first input of the furnace speed controller is connected to the output of the correction controller, the second input of the furnace speed controller is connected to the exhaust temperature sensor, and the engine torque sensor is connected to the third inputs a furnace speed controller and a waste gas flow controller, the outlet of which is connected to another appropriate actuator.

The drawing schematically shows the proposed device.

The device comprises a furnace 1, a furnace drive motor 2, a furnace drive torque sensor 3, a furnace rotation speed sensor 4, a Material temperature sensor 5 in the preheating zone, a flue gas temperature sensor 6, an additional correction regulator 7, an adjustment regulator 8, furnace speed controller 9, exhaust gas flow controller 10, fuel consumption controller 11, raw mixture flow controller 12, fuel consumption sensor 13, raw mixture consumption sensor 14, actuator 15, two-body control tor drive actuators 17, 18.

The device works as follows.

Establish the initial tasks for the material temperature in the preheating zone and the static moment of the furnace, ensuring the normal course of the firing process. In the kiln firing process in the kiln, the controller 11 stabilizes the fuel consumption, and the regulator 12 changes the sludge flow rate so that, depending on the signal from the sensor 4, the flow rate of the raw mixture increases with decreasing rotation speed of the furnace, and decreases with decreasing.

If, during the firing process, the signal from sensor 3 increases, this leads to an increase in the signal at the output of the additional correction regulator 7. At the same time, controller 9 supplies the control body 16 with a signal to increase the furnace rotation speed, which reduces the deviation of the signal from sensor 3 from the specified value. At the same time, the regulator 10 acts on the actuator 17, increasing the flow of exhaust gases so that the deviation of the signal from the sensor 3 from the setpoint is reduced. In this case, the signal from the sensor 5 remains unchanged, since the effect on it of the change in the furnace rotational speed and the flow rate of exhaust gases is mutually compensated.

If the signal from sensor 3 decreases, the controller 9 decreases the speed of rotation.

furnace, and the regulator 10 reduces the flow of exhaust gases so that the deviation of the signal from sensor 3 from the set point is reduced, and the signal from sensor 5 remains unchanged.

If the signal from sensor 5 is increased, then regulator 10 reduces the flow of exhaust gases, and regulator 9 increases the speed of rotation of the furnace so that the deviation of the signal from sensor 5 from the set value is reduced, and the signal from sensor 3 remains unchanged.

Similarly, the control actions change when the signal of the sensor 6 changes.

In the case of a simultaneous decrease in the signals from sensors 5 and 6, the controller 10 increases the flow of exhaust gases. In this case, the regulator 9 reduces the speed of rotation of the furnace motor, and the signal of the sensor 3 remains unchanged. The change in the exhaust gas flow rate and the rotational speed of the furnace engine is made until the values of the specified and current signals of the sensor 5 do not match.

In this case, if changes in the course of the drying process occur with a Frequency, the period of which is less than the time of movement of the material

 In the drying zone, the regulators 9, 10 only react to a change in the signal from sensor 6, since changes in the signal from sensor 5 do not pass through the correction regulator 8, which allows only low-frequency changes in the signal.

If the change in the course of the drying process occurs with a frequency whose period is longer than the time that the material moves in drying, then the regulators 9, 10 react both to a change in the signal from sensor 5 and to a change in the signal from sensor 6. The change in exhaust gas flow is determined by an algebraic sum signals at the output of sensor 6 and of the correction regulator 8. Moreover, the predominant influence of the signal from the correction regulator in the frequency range, the period of which is longer than the material moving along the drying zone, is provided by specifying a higher frequency cient gain for chains 5, 8, 10 and 5, 8, 9 relative to the chains 6, 9 and 6, 10.

S The control performed in this way leads to the stabilization of the kiln firing process at the level of the highest possible performance.

Claims (2)

1. USSR author's certificate number 476239, cl. From 04 to 7/44, 1972. 2. USSR author's certificate number 559096, cl. F 27 D 19/00, 1976.