SU975597A1 - Device for controlling temperature in regenerative glass melting furnace - Google Patents

Description

the stroke of which through an actuator is connected to a fuel control valve installed in the fuel supply pipeline, an adder, an integrator, a logic element I, two relays and a solenoid valve installed on the bypass of the fuel supply pipeline are inserted, the sensor and the temperature setting device are connected to the corresponding inputs of the adder The output of which is connected to the single input of the integrator, the other inputs of which are connected to the corresponding relays, the output of the integrator is connected to one input of the AND element, one output otorrhea connected to the solenoid valve, and the other output element is connected to the third input of the regulator, a relay output is connected to the fourth input of the regulator and another relay output is connected to the second input of the AND.

The drawing shows the device.

The device contains a regenerative glass furnace 1 enveloped in a temperature control loop containing a sensor 2 and a temperature setpoint device 3 connected to the inputs of the controller 4, the output of which is connected to the fuel control valve through the actuator 5 b.

The device also contains a series-connected adder 7, an integrator 8, a logic element And and a solenoid valve 10 installed on the bypass of the fuel pipeline, as well as one Start 11 relay and another relay End 12 of the flame transfer. The inputs of the adder are connected to the outputs of the sensor and setpoint temperature. The output of one relay Start is connected to the integrator control input and the blocking input.

all other relay

regulator,

The end is connected to the second input of the integrator and the logic unit, the second output of which is connected to the blocking input of the controller.

The device works as follows.

In the interval between flame transfers, there is no voltage on the solenoid valve, no fuel is supplied through the bypass, and the device operates in the same way as the known device. For example, when the temperature deviates from the set value at the input of the electronic unit of the controller 4, the error signal appears. The controller generates a control signal and with the help of the actuator 5 changes the position of the fuel valve 6, which leads to a decrease in the error signal and its disappearance. The dynamic settings of the controller are set taking into account the dynamic characteristics of the furnace as an object of temperature control. This is how the device functions before the start of the flame transfer. At the specified moment, one Start of transfer relay is triggered and with its output contacts forms a command to disable the controller (blocking the More, Less commands), and the integrator Start command. In connection with the shutdown of the fuel supply to the furnace, the temperature in the furnace begins to decrease as compared with the set value. The error signal from the output of the adder 7 is fed to the input of the integrator 8, the output signal of which varies in accordance with the expression ti

- one

(one)

and

td-t - 1

out

where ut is the deviation of the furnace temperature from the specified value; t is the moment of termination of transfers (switching on the relay (End);

Ti is the integration time constant.

The value of U out -i characterizes the amount of heat that was not received by the furnace during the transfer of the flame.

After completion of the operation of transferring the tribe, the Relay End through the logic unit generates a command to turn on the solenoid valve 10 and gives a command to integrate back to the integrator 8. The fuel enters the furnace through the main pipeline and through the tank, which contributes to the rapid recovery of the furnace temperature to the specified value. The magnitude of the output signal of the integrator changes in accordance with the expression

 and

and

OUT 1

6L1X 2

where f2 is the time to reach the value

U6biK2 zero; Up - pre-selected, depending on the capacity of the bypass and the main gas pipeline, a constant value received at the input of the integrator from its internal source. Equality of the output of Usbi. integrator to zero means that the amount of heat that was received less by it during the transfer of the flame was returned to the furnace. The output signal Ug ,, integrator 8 enters the element And 9. When it becomes equal to zero, the logic unit forms a command to turn off the electromagnetic valve 10 and after a certain period of time

Claims (1)

Claim A device for controlling the temperature in a regenerative glass-fired furnace, comprising a temperature sensor and a temperature controller connected to two inputs of a controller, the output of which is connected via an actuator to a fuel control damper installed in the fuel supply pipe, characterized in that, in order to increase the accuracy of regulation, an adder, an integrator, an AND logic element, two relays and a 10 solenoid valve installed on the bypass of the fuel supply pipe are introduced into it, and the sensor and setter The temperatures are connected with the corresponding * ·· inputs of the adder, the output of which is connected to one input of the integrator, the other inputs of which are connected to the corresponding relays, the output of the integrator is connected to one input of the element AND, one output of which is connected to the electromagnetic valve, the other output of the element I. is connected to the third input of the regulator, the output of one relay is connected to the fourth input of the regulator, and the e-output of another relay is connected to the second input of the element I.