SU885277A1 - Device for control of additional fuel supply to tuyeres of blast furnace - Google Patents

Description

(54) DEVICE FOR ADJUSTMENT OF ADDITIONAL FUEL SUPPLY TO THE LAMMET OF A BULK FURNACE

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This invention relates to iron metallurgy with the injection of hydrocarbon fuels, mainly natural gas, fuel oil or their mixtures, into blast furnace blast furnaces and can be used in other industries, such as non-ferrous metallurgy, chemical technology, etc.

Closest to the proposed technical essence and the achieved result is a device for the automatic "control of additional fuel consumption through the tuyeres of the blast furnace. The device includes common and individual gas inlets with valves, a regulator of total fuel consumption and a flow sensor to blow and fuel to each lance P

A disadvantage of the known device is the presence of connections between the channels, which leads to the mutual influence of the latter. In this case, a number of uniform controlled values (costs) are interconnected in such a way that a change in one of them causes a change others. Therefore, the automatic control system for the distribution of natural gas among tuyeres is a system of interconnected control, which requires extremely precise operation of a large number of permanently operating devices and regulators, and naturally, this reduces the reliability of the device due to failure of one or another device. device, and complicates its design.

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The purpose of the invention is to increase reliability, simplify the design and increase the efficiency of use of the injected gas.

The goal is achieved by

20 that the device for regulating the supply of additional fuel, which includes general and individual gas boosters with valves, a regulator of total fuel consumption, and air flow sensors, blow and fuel for each lance is equipped with additional bypass pipes with built-in constant aerodynamic resistance valves connected to the regulator fuel consumption for each tuyere. Cylinders, diaphragms, or-sop are used as shut-off valves with constant local resistance. la Laval, The critical sections of the diaphragm or Laval nozzles are: calculated for a certain fuel consumption. Installing several, for example, bypass pipes with a shut-off valve and a constant resistance, in the form of a Laval nozzle, allows you to change the fuel consumption when you increase or decrease the consumption to blow from the average calculated value by a certain amount by turning off or on one of the valves. as the Laval nozzle in the off-design mode transmits an almost constant amount of gaseous fuel in a wide range of pressure variations in front of it, the change in fuel consumption on the lance under consideration does not affect on fuel consumption in other tuyeres. This increases the control reliability and simplifies the design of the device. The drawing shows a device for adjusting the fuel supply to the lance. The device includes a common gas pipeline 1 of a blast furnace, with a constant fuel consumption, supported by a regulator of total fuel consumption: a section of pipeline 2 to lance 3 of a blast furnace, a flow meter-device C of fuel with an indicating device 5 bypass pipes 6 of constant resistance 7, made in the form of a cylinder, diaphragm, Lawal nozzle,. shut-off valves 8, sensors 9, flow rate of blows per lance with differential meter 10, secondary device 11 and magnetic starters 12. The device operates as follows. In the working position, when the maximum economic effect is reached, the gas consumption is maintained at a certain, certain level, which is optimal for this furnace. In this case, one or two valves, based on the value of the cross-sectional area of the Constant resistances, are B-position-Open, and the rest are in the position .Closed. The cross-sectional areas of fixed resistances are calculated according to a well-known method .. Gas from a common gas pipeline 1. through. Flow rate. the device of resistance is safe and the shut-off valves 8 flow from the injector into the flow to blow,. Reducing the consumption of blowing. Below a predetermined value, for example, because of a decrease in temperature in the tuyere zone, which is equivalent to an increase in the consumption of natural gas above the optimum, leads to a decrease in the intensity of smelting, in the amount of ore melted and to a decrease in the efficiency of natural gas use and becomes economically unjustified. .-. In this case, the signal. By changing the flow rate, the blow from the sensors 9 is supplied to the differential pressure gauge 10, for example, the type of DME-R. Depending on the fuel consumption value, the four-position secondary secondary device 11, for example, type KSU-2-004 with an additional contact f, sends a signal to the magnetic actuators 12, which are turned off (the position is closed) the corresponding valves 8. As constant resistance 7 is made in the form cylinder, diaphragm, Laval nozzles, etc. (preferably Laval nozzles), allow a constant flow rate of natural gas in a wide range of gas pressure in front of them, the flow rate of gas on other tuyeres remains almost unchanged. and the flow rate is blown to a separate lance, for example, due to channeling in the charge layer, the signal from the flow sensor 9 blows to the differential pressure gauge 10. Depending on the magnitude of this flow, the four-position secondary device 11 sends a signal to the magnetic starters 12, which include (position Open) corresponding valves 8. In both cases, the gas flow is maintained at a certain specific level in accordance with the flow rate blowing. This achieves the maximum economic effect of using natural gas. gas, and the device improves.; the reliability of regulation and simplifies the design of the device. The use of the device will increase the reliability of regulating the distribution of fuel in the tuyeres — and will automatically support the domain mode.

melting without overstocking of the tuyere zone and blowing in the charge column. Taking a reduction in specific coke consumption. And an increase in productivity due to the operation of the device for

Adjusting the supply of natural gas. for lances of blast chi-2%, the economic efficiency for a furnace with a capacity of 560 tons / day with a coke consumption of 520 kg / t of pig iron exceeds 100 thousand rubles. in year.

Claims (1)

Invention Formula The device for regulating the supply of additional fuel to the tuyeres of the blast furnace, a furnace containing a common and indus, visionary. Gas supply with valves, a regulator of the total fuel consumption and flow sensors to blow and fuel, to} each tuyere, o t h and h KI shch e fi by the fact that, in order to increase reliability, to simplify the design and increase the efficiency of use of the injected gas, the device is equipped with 1 in additional bypass pipes with built-in valves. aerodynamic resistance connected to the regulators and fuel on each lance, IS Sources of information taken into account in the examination 1, USSR Copyright Certificate f-366621, cl. From 21 to 7/16, 1970.