RU1813110C - Method of ignition of sintering mixture - Google Patents

Abstract

Usage: metallurgists, namely the agglomeration of ores and concentrates. SUBSTANCE: in a method for igniting a sinter charge; including heating it to a temperature above the ignition temperature of the solid fuel, heating the surface layer of the sinter mixture is carried out by a scanning beam of an optical quantum generator (laser). .

Description

FIELD: metallurgy, in particular, agglomeration of ores and concentrates.

The aim of the invention is to intensify the ignition process of the sinter charge and combine it with the sintering process.

This goal is achieved in that in a method of igniting an agglomeration charge, comprising heating the surface layer of the mixture to a temperature above the ignition temperature of solid fuel by filtering gases through a layer, heating the surface layer and the mixture to a temperature above the ignition temperature of solid fuel combustion products of gaseous fuels, electric current or hot air, and a scanning beam of an optical quantum generator (laser). .

In order to carry out the claimed method, it is necessary to replace the incendiary furnace operating on liquid or gaseous fuel (by means of which ignition is performed) in the design of the sintering machine with an optical quantum generator (laser), which provides heating of the surface layer of the sintering mixture to a temperature exceeding the ignition temperature of solid fuel, while simultaneously filtering the gases through the bed, carried out by means of flash means.

The proposed method is implemented as follows.

A charge is loaded onto the sintering machine, which then falls into the range of the optical quantum generator located above the machine. The laser beam scans across the width of the surface of the ignited layer, heating this surface to the required temperature, which should be higher than the ignition temperature of the solid fuel. Then sintering of the sinter mixture is carried out.

As shown by experiments on ignition of an agglomeration charge using a scanning beam of a TL-1.5 technological laser (designed by NIICTL. 1990), the proposed method can significantly increase the intensity of the ignition process compared to the prototype. It has been experimentally established that the ignition of an agglomeration charge, corresponding in composition to the sinter charge of the Cherepovets Metallurgical Plant, proceeds efficiently at a radiation power of 800 W, which is about 50% of the maximum power of this laser - 1,500 W. The diameter of the light beam was 19 mm (stain area 283.5 mm2, respectively). The scanning speed required was 15 mm / s. With a decrease in the radiation power or an increase in the scanning speed of the ignition, the sinter charge does not

was happening. On the contrary, an increase in the radia tion emissivity to 1000 W. or more, a decrease in the scanning speed to 8-12 mm / s or a decrease in the spot diameter to A mm :: led to the complete melting of the surface of the agglomerated layer, which: did; impossible further sintering; s / that;.; The use of laser RGB ignitions i / 1 allowed to reduce the ignition time from 1-2 minutes to 1.26 s, which was achieved in 0; a significantly higher concentration of energies / vu ea | e-: 5 ra (interesbnosti radiation emitted / went; 282 W / cm2). For this in m left yyy; expense. energy on; : Yedinu Nrv yor x rs and srs-g and; 0.355 kJ / cm. that dbstatr but: dl. efficient ignition. Laser ignition

by zyol t7 In y.shcht: - dy y ZN; yg IP2.y.: with 3 m or more db several sant.meters. - / l; Claimed method of ignition of agglomeration - You can be realizator & an. how: on conveyor agglomeration mz-: tire type; so :, and: on others; agglomeration machines of any design by means of ignition gbr; -: on gaseous: (liquid) fuel, on optical quantum generator-torr (laser). Particularly preferred is the inventive method for sintering machines designed for sinter pressure sintering. Such designs. In many cases, both sintering and ignition of the sinter charge under pressure are provided. Meanwhile, the design of incendiary furnaces on gaseous (liquid) fuel, operating at overpressure of the combustion products, is explosive. The claimed method, on the contrary, is equally safe both when filtering gases through a layer in a vacuum mode and under pressure.

In addition, the claimed method will allow combining the ignition process with

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the sintering process of the sinter mixture. In contrast to the prototype, where during ignition a mixture of combustion products of gaseous (liquid) fuel and air enters the sintering charge layer, although it contains an increased amount of oxygen, but still significantly less than 21%; with laser ignition, air containing 21% oxygen enters the layer, which ensures the normal sintering of the sinter mixture at the same time as ignition. This significantly increases the area of sinter machines used for sintering. ;; beats ;:: Ј;: & ..-,. :. .

The advantage of the claimed rip method in comparison with the commercial type is also its ecblogic cleanliness, which is explained by the refusal to use gas fuels and liquid fuel in the combustion products of carbon monoxide compounds: harmful substances: nitrogen oxides and sulfur dioxide); urine carbon monoxide, etc. Lasers are also distinguished by their ecological purity; from other sources of kb HiiieHfrjrbby nby, energy, such as Mejiiii such as ri / iaaMPTppiHbt, which are formed during operation. nitrogen oxides .. Advantage of the laser) :) about in:. Toi what they are: they can work in any area of the correct electromagnetic and fb radiation, including X-ray, ultraviolet, visible, infrared and other rays.: In general, replacing the energy of gaseous / or liquid fuel with the energy of optical quantum the generator allows to increase the thermal efficiency of the ignition device (laser efficiency is 100%), and also to eliminate harmful emissions during ignition of the layer of the sinter charge and, due to this; to reduce the total emissions from sinter machines, and, ultimately, improve the overall environmental situation at sinter plants. "

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 How to ignite the sinter charge, including heating the surface layer of the charge to a temperature higher than the ignition temperature of the solid fuel, by filtering gases through a layer, characterized in that, in order to intensify the ignition process, combining it with the sintering process, the surface layer of the sinter charge is heated by scanning beam of an optical quantum generator (laser).