SU631538A1 - Method of discharging gas from converter - Google Patents

Description

The invention relates to ferrous metallurgy and can be applied when venting gases from steel-to-steel converters. There is a known method of venting gas from a converter, which includes lowering its caloric content by mixing it with a caloric gas l}. According to this method, more caloric gas in an amount is introduced into the exhaust converter gas with a carbon oxide content below the ignition limit (1–20%), which ensures the mixture ignites and is completely burned in the atmosphere at the candle of the exhaust gas path. The disadvantage of this method is unproductive consumption of gaseous fuel. The closest to the described invention to the technical essence and the achieved result is a method for venting gas from the converter, including the suction of gas through the hoses loaded into the converter for the purpose of heating it {2. However, this method does not exclude carbon monoxide emissions into the atmosphere; the absence of the required composition of the charge and temperature conditions of the process. The aim of the invention is to eliminate emissions of carbon monoxide into the atmosphere. The goal is achieved by passing a converter gas containing 1–20% carbon monoxide through a layer of iron ore raw material heated to 400 IEP, while the raw material is used containing hematite 18,228 kg / ton of steel with partial combustion of exhaust gases and 7.3–17 , 1 kg / ton of steel with the removal of gases without afterburning. When gas is withdrawn from the converter without afterburning or with partial CO afterburning, the converter gas containing less than 20% of carbon monoxide does not burn at the spark plug of the gas exhaust duct. In order to prevent the release of CO into the atmosphere, this gas is passed through a layer of iron ore raw materials in order to fully utilize small concentrations of carbon monoxide in the reduction of iron oxide 3 Ge2O3 + CO PejO + COjj. The reduction reaction proceeds at a sufficiently high rate in the temperature range of 400 ° C ° C (temperature above is unacceptable due to

the possibility of reflow zhegsheorudnogo raw materials).

The content of hematite in the feedstock is determined by the amount of carbon monoxide emitted with non-combustible converter gas. The above cost of hematite is determined for specific emissions of CO 0.2 "VT steel at the gas outlet without afterburning and sta- tion. whether - with a withdrawal with partial afterburning of CO,

and p and 5Mer Bp. Ouchestvleny, the proposed method of gas and water W. .T coaverg.oor equip the layer of the 8th reductant annapsa oM Shakta G6 type with a cross-section of material and gas. When a gaea 350t converter is being used and the process temperature, the volume of sociopolitical apparaga is loaded with 196 i 1 ton of output from partial dozngany and 4.3 t with discharge of gas without dozsgangan CO.

The drawing shows a section of the gas outlet of the fifth-line converter, including a double bypass 2 gas emitters and devices necessary for the realization of the method. Work gas duct 1 is equipped with louvre grille 3, load 4 and S unloading devices; , vkokokupyosty recovery aparat. The reduced section of the flue duct is located between the radiation cooler and the gas cleaning unit or between the gas cleaning unit and the smoke exhauster. Alternating interconnections of gas ducts 1 and 2 with the inlet gas duct b is carried out with the help of a reversible valve 7j. The desired temperature in the range of 4OOf1100 C is maintained by burning part of the pot converter hectares. For this, the working gas duct is equipped with a rotor before entering the gas; for the afterburning of gas, i consisting of tuyeres for supplying air 8 and a restraint 9,

In the mendorizable period, iron ™ ore raw materials are loaded with a dense layer into the cavity between the louvers of the flue gas duct 1. In the period of the duoia converter, when the content of carbon monoxide in the converter gas is 1-20%, the inlet duct 6 is reported at the dump valve 7. with the gas duct 1 and the gas is directed through the layer of heated iron ore to its raw material, at the rest of the purge time the co-turbid gas containing CO more than 20% and the air exhausted by the exhauster during the purging period is passed through the duct 2.

When the carbon monoxide content in the gas at the exit of the layer, the prevailing standards for the emission of S to the atmosphere are replaced by a layer of iron ore burner.

The implementation of the method does not require complicated and expensive devices. The iron ore raw materials necessary for the implementation of the method are available in the field under the conditions of the metallurgical plant and after it is used to purify the converter gas from carbon monoxide can be used both in the converter and in the BV blast furnace production.

Ffm of the story

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The method of removal of gas from the converter, including gas passing through the iron ore charge layer, characterized in that, in order to eliminate emissions of carbon monoxide into the atmosphere, the converter gas passing from 1 to 20% carbon dioxide is passed through the layer of iron ore raw material , and the raw materials are used, containing hematite 182g 428 kg / t of steel with partial afterburning of the exhaust gases and 7, 1 kg / steel with the removal of gas without reburning.

Sources of information taken into account during the examination:

1. Author's certificate of the USSR P 414310, cl. C 21 C 5/38, 1974.

2. USSR Author's Certificate No. 23S495, class, C 21 C 5/38, 1967.