SU1498790A1 - Apparatus for regulating distribution of pulverized fuel among tuyeres of blast furnace - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used in blowing dust-air mixture. The aim of the invention is to increase the uniformity of the distribution. The differential pressure of the mixture, which characterizes its flow rate, is monitored on sections of the dust ducts located at distances not exceeding two calibers from the mixture divider. 1 il.

Description

The invention relates to metallurgy and. can be used in the smelting of iron in a blast furnace with injection of pulverized coal.

The purpose of the invention is to increase the uniformity of distribution.

The drawing shows a device for controlling the distribution of pulverized coal in the blast furnace tuyeres.

The device consists of a flow divider 1 with pipe conduit 2 for supplying pulverized coal and waste dust pipelines 3 supplying coal to the blast furnace tuyeres, pressure differential gauges 4 connected by one tap to the measuring point in divider 1,

another - with a waste measurement point -: a common dust pipe 3 at a distance of no more than two calibers, the signals from which are sent to the control unit 5, to which a signal is supplied from the setpoint gauge 6 of the pressure differential connected by one outlet to the measuring point in the divider, to others, with the measuring point on the straight-line section of the supply cable 2 at a distance of not more than one caliber from the divider. The control unit 5 controls the resistance regulators 7 installed on the exhaust dust pipes behind the pressure drop meters.

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The device works as follows.

With an established uniform distribution of coal dust over the tuyeres of the blast furnace, the effect of resistance regulators 7 ensures the equality of the pressure drops, controlled by the 4 differential meters. In the case of a change in the resistance of the pipelines 3 or of the counterpressure in the tuyeres, the signals of the 4 differential pressure gauges mismatch. These signals go to block 5, where they compare with the signal from the setpoint meter 6, and from the control unit 5 to the resistance regulators 7, control signals are received so as to equalize the pressure drops measured in the control panel 3, according to with the differential pressure measured by the measuring instrument 6. The equality of air velocities with equal pressure differences in the exhaust dust ducts is due to the fact that in the area up to two calibers, in the area of pressure compression of the jet, m, insignificant in

Compared with pressure loss, the condition-ZO measures the pressure drop established by the flow of air. The air velocity at a distance of 0.5 gauge from the divider, in the area of the greatest

On the exhaust dust pipe, one branch is connected to the divider, the other - to the dust pipe on its straight line in front of the regulator

squeeze jet dramatically increases that

temperature fluctuations along the entire perimeter of the furnace, heating of the charge, which greatly improves the blast-smelting process, and increase the consumption of pulverized coal, eliminating it in some tuyeres, looking for the formation of black carbon, which leads to tuyere instrument

The economic effect from the introduction of the device is ensured by reducing the uneven distribution of coal fuel in the tuyeres from + 20% to + 3%.

Formula FROM Finding

A device for controlling the distribution of pulverized coal over the blast furnace tuyeres, which contains pressure drop meters on the inlet and exhaust-dust pipelines split, a control unit connected to the resistance regulators of the exhaust dust tubes, in order to improve the uniformity of distribution, pressure drop meters installed on the dust pipe, one pipe connected to the divider, the other to the pipe pipe in its straight line in front of the regulator

facilitates the measurement of pressure drop 3–5 of resistance at a distance not further than Taksh- way, the optimum distance from the divider to the point of measuring pressure of 0.5 gauge.

The increase in comparison with the known device of the uniformity of supplying 40 fuel to the blast furnace tuyeres makes it possible to organize a uniform, without

two calibers from the divider, and the pressure difference meter installed on the inlet dust pipe is connected, one branch with the divider and the other to the dust pipe on its straight line, at a distance of not more than one caliber from the dividers.

no further resistance

two calibers from the divider, and the pressure difference meter installed on the inlet dust pipe is connected, one branch with the divider and the other to the dust pipe on its straight line, at a distance of not more than one caliber from the dividers.

Claims (1)

Claim A device for controlling the distribution of coal coal fuel through the tuyeres of a blast furnace, comprising pressure differential gauges on the inlet and outlet dust pipes of the divider, a control unit connected to the resistance regulators of the outlet dust pipes, characterized in that, in order to increase the uniformity of distribution, differential pressure meters installed on the dust outlet pipe, one branch connected to the divider, the other to the dust pipe in its straight section in front of the resistance regulator yanii no further two calibers from the divider, and a differential pressure gauge, mounted on the supply pyleprovode is connected. one branch with a divider and another with a dust pipe on its straight section at a distance of not more than one caliber from the divider.