SU1359614A1 - Device for controlling pressure of blast cupola diverting channel - Google Patents

Abstract

The invention relates to the production of pig iron in cupolas and is intended to control the pressure regime of the cupola discharge line. The purpose of the invention is to reduce the specific consumption of coke and electricity by increasing the quality of control. The essence of the invention lies in the fact that when the production of the cupola 1 is changed, the sensor 7 of the ejection Water flow rate 7 - regulator 8 - control valve 10 water flow to the scrubber 6 is changed by the circuit. Pressure sensor 2, regulator 3 and regulator 4, a predetermined gas pressure at the top is processed. When the flow rate is changed, the error signal appears at the inputs of the regulators 11 and 15. The controller 11 changes the position of the gate 12, which helps to maintain a stable control characteristic of the air ejector valve 19 20. The output signal of the comparator 17 also changes as the flow rate changes, connected to the regulator 15, which forms at its output a new value of the stabilized pressure in the combustion chamber 13 1 sludge. in ff O1 1 /

Description

ten

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The invention relates to controlling the production of pig iron in cupolas, namely, controlling the pressure regime in a cupola exhaust duct equipped with wet blast furnace and BFO reflux units in a heat recovery combustion chamber.

The aim of the invention is to reduce the specific consumption of coke and electricity.

The drawing shows a diagram of the proposed device.

At the outlet of the top of the cupola 1, a pressure sensor 2 is installed, the output of which is connected to the regulator input.

3 associated with the regulatory body

4, installed in the flue gas pipeline after dust collector 20 5 and ejecting scrubber 6, Sensor

7 flow of ejecting water is connected to the first input of the proportional regulator 8, the second input of which

is connected to the output of the air blowing sensor 9, and the output is connected to the control valve 0. The first input of the second proportional regulator 11 is connected to the output of the air blowing sensor 9, and its output is connected to the adjustable gate 12,

installed in the chimney, and the second input of the same controller. A pressure sensor 14 is installed in the combustion chamber 13, the output of which is connected to the first input of the regulator

15 pressure The second input of the pressure regulator 15 is connected to the output of the rated pressure sensor 16, its third input through the comparison block 17 connects the outputs of the air flow sensor 9 blowing and the regulator 15 of its nominal flow, and the output of the regulator 15 is connected control valve 19 of the air ejector 20, installed after the heat exchanger 21 in the chimney. The device works as follows.

When the performance of the cupola changes, a discrepancy signal appears at the input of the controller 8. The controller 8 displaces the regulator 10 in proportion to the error that has occurred. In connection with the change in the flow rate of the ejecting water, the error signal to the regulator 8 disappears. With the appropriate choice of the coefficient

thirty

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35

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five

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forcing the regulator 8 to change the flue gas flow rate does not entail a deviation of the pressure at the furnace head from the specified value. If a deviation occurs, the regulator 3 moves the regulating valve 4 and adjusts the current pressure in accordance with the specified one.

As a result of the use of an ejecting effect of water on the pressure in the control flow path, the characteristics of the valve 4 do not change or change insignificantly, and therefore the quality of the pressure control on the furnace head remains high regardless of the amount of top gas. Thus, the quality of pressure stabilization at the top is determined only by the settings, regulators 3 and 8 and does not depend on the performance of the cupola.

When the flow rate is changed, the blown error signal also appears at the inputs of the regulators 11 and 15. The regulator 11 moves the gate 12 by an amount proportional to: the resulting error (due to hard feedback). 0 Moving the gate 12 contributes to maintaining the stability of the adjusting characteristics of the valve 19 of the air ejector 20. Simultaneously with the change in consumption, the blowing changes. Also, the output signal of the comparator unit 17, which is fed to the third input of the regulator 15. In this case, a new value of the specified stabilized pressure in the combustion chamber 13 is formed at the input of the regulator 15. As a result of the regulator

11 moving the adjusting gate

12, the pressure deviation in the combustion chamber 13 from the reference cannot be

5 is essential, since, in the presence of a mismatch signal at the input of the regulator 15, the latter moves the adjusting valve 19 of the air ejector 20 and adjusts the current pressure to the set pressure.

During operation of the device, the safety of the operating personnel is increased, the probability of formation of explosion-hazardous mixtures in the exhaust path is reduced, the top gas is prevented from entering the working area of the workshop and the emission of harmful components to the atmosphere is reduced.

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Thus, when using the device, a high quality control of the pressure regime of the outlet path of the cupola is ensured throughout its entire range in a wide range of changes in its performance. This leads to the improvement of technical and economic indicators of the cupola-recuperator complex, reduction of additional fuel consumption to the recuperator, increase in air heating temperature and, as a consequence, decrease in specific coke consumption, reduction of electric power consumption by ejecting water blowers.

Claims (1)

Invention Formula A device for controlling the pressure regime of a wet gas cleaning cupola exhaust tract and afterburning of the top gas, containing a series of top gas pressure sensor and a first regulator connected to a regulator mounted on the pipe of the purified top gas, series-connected pressure sensor in the combustion chamber Recterator of the cupola and the second regulator. E. Sligan 1- - I- Order 6143/41 Compiled by A.Abrosimov Tehred M.Hodanich Circulation 543 VNIIPI State Committee, USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 14 The lator, the regulator of the forced-pull channel, the regulating gate at the outlet of the heat exchanger and the regulator at the conduit, characterized in that, in order to reduce the specific consumption of coke and electricity, it is additionally equipped with sensors for the flow of air blowing and ejecting water, the third and fourth regulators are controlled by a reference unit, a control unit, a flow rate control unit, and a controller of the nominal pressure in the combustion chamber, with the outputs of the air flow rate sensors connected to two inputs of the third regulator The ejector water is also connected to the regulator on the water line, the output of the air flow sensor is connected to the first regulator of the fourth regulator, and its output is connected to the regulator with a 1m gate and the second input of the same regulator, the second input of the second regulator is connected To the output of the nominal pressure setting device, to its third input, the outputs of the air blowing sensor and the nominal flow setting indicator are connected via the comparison unit, and the output is connected to the control valve of the air ejector. Proofreader M. Demchik Subscription