SU144261A1 - Method of controlling blowing cupola - Google Patents

Description

Installations are known for automatically controlling the flow of air into the cupola depending on the temperature of the blow.

A feature of the present method of controlling the blow fed to the cupola is that, in order to maximize the temperature of the molten iron, the amount of the blow is automatically controlled by means of an extreme regulator.

The extreme controller operates on the basis of a five-clock circuit.

The drawing shows the location of the additional equipment of the cupola and the scheme of automatic regulation of blowing.

For the implementation of the method, the cupola 1 is provided with a permanently operating thermocouple 2, an amplifier 3, an air line 4 with a fan 5 and a gateway 6 moving from the gearbox 7 and the reversing engine 8.

In the block diagram, a step finder is used: a PI, a relay P, and a relay polarized RP.

The use of an extremal regulator occurs as follows (see drawing):

/ - measuring element of the temperature of molten iron;

// - memory element and comparing temperature values at different times, consisting of an electron tube and capacitors;

/// - an element that multiplies the values of the temperature spacing and the difference of blowing or signs;

IV - executive body regulating to blow cupola.

The extreme controller has five working cycles.

At the first switching cycle, which occurs with the help of the walking finder, the previous temperature values are erased; at the second time step, the temperature value is memorized; on the third, switching on the executive engine, interchanging the spigot 6 of the air duct 4; on the fourth cycle - setting and memorizing the direction of movement of the gate, on the fifth step - reference number 144261-- 2 remembering the new temperature value and comparing it with the previous one.

Depending on the sign of the temperature and the direction of rotation of the actuating motor, the gate of the air duct will close and open in the direction of the maximum of the extreme curve. Since the process is automatically repeated, the most favorable condition for optimal blowing is thus selected, which produces liquid iron with the highest temperature possible at a given time under the conditions of smelting.

Subject invention

A method of controlling the process of blowing the cupolas, characterized in that, in order to ensure the maximum temperature of the pig iron produced, the optimal amount of blown into the cupola is automatically set and adjusted by an extreme regulator.