SU1232910A1 - Arrangement for heating hearthers of coveyer machines - Google Patents

Description

The invention relates to the production of iron ore raw materials in ferrous metallurgy, namely to devices of annealing conveyor machines.

The purpose of the invention is to save solid fuel and increase the quality of the finished product.

The drawing shows a schematic diagram of an apparatus for the combined use of fuel mixtures in the furnaces of conveyor machines.

The device consists of a vertical body 1 with an air swirler 2, a central pipe 3 with an ejector 4 and a mechanical metering device 5, nozzles 6 and 7 for supplying air and gas, a block with a tunnel 9 for burning fuel.

The device works as follows.

For domain processing, it is much more economical to iodine pellets with an FeO content of more than 5-8%. Such cells are not worn out and are not destroyed during the reduction treatment in the upper part of the blast furnaces. The production of such slabs becomes possible when a solid reducing agent is introduced into the initial mixture.

In the proposed device, the input of solid fuel is made directly through the fuel-burning device.

In the Central pipe 3 through the pipe 7 serves gaseous fuel. The ejector 4 sucks in this flow the pulverized fuel supplied from the bunker by the screw conveyor through the metering device 5. The resulting fuel gas mixture is sent to the tunnel 9, mixed with air-oxidizer and burned in a flat torch. In the hearth the final mixing of all components occurs, the particles ignite. solid fuel and feed them directly into the bed of material to be calcined.

12329102

The central tube, which is less than 0.5 of the tunnel entrance cross section, shortens the length of the gas suspension with the oxidizer, reduces 5 the fuel burn rate, and with an increase in diameter of more than 0.8, the section for supplying the required amount of oxidant air becomes insufficient.

The mouth of the central pipe must be installed from the entrance to the tunnel at a distance b, equal to 0.4-0.7 of the diameter of the entrance section of the tunnel. When the mouth of the pipe is removed from the tunnel entrance for a distance of less than 0.4 of the diameter of the tunnel inlet section, the length of the path and the degree of mixing are reduced, the efficiency of gas combustion deteriorates. When deleting the mouth

20 pipes from the entrance to the tunnel at a distance greater than 0.7 of the diameter of the entrance section of the tunnel, combustion will occur at the boundary of the suspension of the gas suspension with air, which can lead to

25 the beating of the air supply nozzle with solid fuel combustion products.

The pipe is equipped with an ejector and a mechanical dispenser. The dispenser is required for uniform supply of solid

30 fuel in time, and an ejector ensures reliable transportation of a gas-coal air mixture, In the central pipe, the ejector nozzle should be located at the top of the metering axis at a distance of 35

Yanin with 0.7-1.0 axes of the metering section d of the dispenser. This ensures a sufficiently high ejection effect from the system to the coal flow and the reliability of transportation

Q of aero mix through the central tube. With a smaller removal of the ejector nozzle (less than 0.7 of the metering axis of the metering section), the zone of maximum dilution by lowering the jet stream 45 below the level of the metering unit and its clogging will be possible. With a greater distance from the ejector nozzle from the dispenser axis, the zone of maximum dilution of the conveying jet rises Bbmie the metering level and the installation of the ejector becomes unjustified.

The diameter of the central tube should be made 0.5-0.8 of the diameter T of the tunnel inlet section. This ensures the stable combustion of gaseous and partially solid fuel, the precipitation of hot coal particles from it, their inclusion into the coolant flow, and the joint supply of it directly into the bed of calcined material. With diameter

Yanin with a 0.7-1.0 axis pass

d section of the dispenser. This ensures a sufficiently high ejection effect from the system to the coal flow and the reliability of transportation

Aerosuns on the central tube. With a smaller removal of the ejector nozzle (less than 0.7 metering axes of the metering section), the zone of maximum dilution by the jet transport drops below the level of the metering unit and its clogging is possible. With a greater distance from the ejector nozzle from the dispenser axis, the zone of maximum dilution of the conveying jet rises Bbmie of the metering level and the installation of the ejector becomes unjustified.

The test results are shown in the table.

The application of the invention provides the possibility of using non-deficient solid fuel, which leads to a reduction in the cost of redistribution of finished products by 3-5% and by 0, 40 0.50 0.85 19

0.46 0.50 0.85 20

Increase in the content of ferrous iron in the finished product by 5-6%.

100 Decrease in bursts of FeO by 14%

97 Decrease in FeO by 3%

Editor A. Kozoriz

Compiled by A. Bliznyukov Tehred L. Serdyukova

Order 2754/38 Circulation 561 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Project, 4

Proofreader A.Ferents

Claims (1)

DEVICE FOR HEATING CONVEYOR MACHINES, containing a vertical casing with an air swirl, a central pipe for transporting a gas-coal air mixture with an ejector and a mechanical metering device, nozzles for supplying gas and air and a block with a tunnel for burning fuel in a flat torch, characterized in that, for the purpose of saving solid fuel and improving the quality of finished products, the diameter of the central pipe and the removal of its cut from the entrance to the tunnel is made equal to 0.5-0.8 and 0.4-0.7, respectively, of the diameter of the inlet section of the tunnel, and the ejector bore in the central tube is located above the dispenser axis at a distance from it equal to 0.7-1.0 axis of the bore of the dispenser.