SU960270A1

SU960270A1 - Method for heating olid charge in converter

Info

Publication number: SU960270A1
Application number: SU813273639A
Authority: SU
Inventors: Анатолий Иванович Манохин; Игорь Анатольевич Талдыкин; Алексей Григорьевич Зубарев; Виктор Владимирович Казанский; Геннадий Сергеевич Колганов; Борис Михайлович Костяной
Original assignee: Научно-производственное объединение "Тулачермет"
Priority date: 1981-04-10
Filing date: 1981-04-10
Publication date: 1982-09-23

Description

Изобретение относитс к черной металлургии, а именно к производству стали в конвертерах.FIELD OF THE INVENTION The invention relates to ferrous metallurgy, namely to the production of steel in converters.

Наиболее близким к изобретению по технической сущности и достигаемому эффекту вл етс ИЧМ-способ произ .водства стали в конвертере, включающий подачу через донные фурмы топлива и окислител и одновременно подачу через верхние фурмы окислител и жидкого топлива ц1.The closest to the invention in technical essence and the achieved effect is the HMI-method of steel production in the converter, including the supply of fuel and oxidizer through bottom tuyeres and simultaneously the oxidant and liquid fuel fed through upper tuyeres.

Недостатком известного способа вл етс отставание нагрева средних слоев шлхты от нижних и верхних и, вследствие этого, неравномерный . прогрев лома.The disadvantage of the known method is the lag of heating the middle layers of the slach from the lower and upper layers and, as a result, uneven. heating scrap.

Целью изобретени вл етс сокращение периода нагрева шихты до заданной среднемассовой температуры.The aim of the invention is to reduce the period of heating the charge to a predetermined average mass temperature.

Поставленна цель достигаетс Чем, что согласно способу нагрева твердой шихты в конвертере, включающему подачу через донные фурмы топлива и окислител и одновременно подачу через верхние.фурмы окислител и жидкого топлива, расход окислител , подаваемого через верхние фурмы, равен 10-30% теоретически необходимого дл полного сгорани жидкого топлива, а остальное количество окислител подают через донные фурмы, при этом плотность жидкого топлива, подаваемого через верхние фурмы, 5 составл ет 0,84-1,20 г/см .The goal is achieved Than, that according to the method of heating a solid charge in the converter, including the supply of fuel and oxidant through bottom tuyeres and simultaneously the supply of oxidant and liquid fuel through the upper tuyeres, the consumption of oxidant supplied through the top tuyeres is 10-30% of theoretically necessary complete combustion of the liquid fuel, and the remaining amount of oxidant is fed through the bottom tuyeres, while the density of the liquid fuel supplied through the top tuyeres 5 is 0.84-1.20 g / cm.

Топливо, подаваемое через верхние фурмы, должно быть об зательно жидким , имеющим плотность в пределах 0,84-1,20 г/см, например мазут, The fuel supplied through the upper tuyeres should be necessarily liquid, having a density in the range of 0.84-1.20 g / cm, for example fuel oil,

10 нефть сыра , сол ровое масло, смолы и т.п. Подаваемое сверху жидкое топливо , не сгоревшее в результате не;достатка кислорода, течет вниз в промежутках между кусками скрапа и 10 cheese oil, salt oil, resins, and the like. Liquid fuel supplied from above, not burned as a result, is not; oxygen is sufficiently flowing down between the pieces of scrap and

15 в средних сло х скрапа контактирует с окислителем, движущимс .вверх от . донных фурм. Зона горени избыточного топлива оказываетс в центральных сло х скрапа, в результате чего 15 in the middle layers of scrap is in contact with an oxidizing agent moving up from. bottom tuyeres. The combustion zone of excess fuel is in the central layers of scrap, resulting in

20 прогрев садки получаетс равномерным и, как следствие, более быстрым. Плотность жидкого топлива ограничиваетс пределами 0,84-1,20 г/см- в св зи с тем, что более легкие виды20 heating the cage is uniform and, as a result, faster. The density of the liquid fuel is limited to 0.84-1.20 g / cm - due to the fact that lighter types

25 топлива (например, бензин, спирты, бензол, эфиры и т.п.), вл ющиес легкокип щими, не проникают внутрь Ссщки, сгора в верхней зоне полости конвертера. В то же врем более т желые25 fuels (for example, gasoline, alcohols, benzene, ethers, etc.) that are boiling do not penetrate into the interior of the converter in the upper zone of the converter. At the same time, more severe

Claims

30 types of fuel (for example, tar, bitumen, etc.) due to their high viscosity do not give the desired result. The consumption of the oxidizer through the upper tuyeres, equal to 10-30% of the theoretically necessary for the complete combustion of liquid fuel, gives a significant reduction in the period of heating the charge to a predetermined average mass temperature (in the optimal variant twice). Reducing it below 10% leads, with a constant total heat load, to overheating of the lower layers of the charge. Increasing it in excess of 30%, also at a constant total heat load, leads to overheating of the upper layers. The method of heating the solid charge can be implemented with different regime parameters, depending on the charge of the converter, the type of fuel and the bulk density of scrap. Example 1. 80 tons of scrap medium are loaded into a 160-ton converter. density (50% of the weight of the tank). 50 m / min of natural gas and 200 m / min of oxygen are supplied through bottom lances. The excess oxidant fed through the bottom tuyeres is. 100 . 65 kg / min of mazut and 3Q of oxygen are simultaneously supplied to the upper lances, which accounts for 23% of the total amount of oxygen. The lack of oxygen supplied from above is equal to the excess of oxygen supplied through the bottom tuyeres. The duration of scrap heating to the mass-average temperature necessary for balancing heat with a consumption of 50% scrap and 50% liquid iron is in the indicated heating mode of 8-10 minutes. Example2. 80 tons of scrap of yellow weight (cutting blooms, thick sheets, etc.) are loaded into a 160-ton converter. 40 m / min of natural gas and 170 m of oxygen are supplied through bottom tuyeres. Fuel oil at a rate of 50 kg / min and oxygen of 10 m / min (10% of the theoretically necessary) is supplied to the upper lances. The heating time of the scrap metal is 14-18 min at the indicated mode (on average 2-3 min. Faster than with the basic heating technology). Example 3. In the 160-ton converter load 80 tons of scrap-lightweight. 40 m / min of natural gas and 136 m / min of oxygen are supplied to the bottom tuyeres. At the top, the lances are supplied with fuel oil at a rate of 40 kg / min and oxygen 24 (30% of the theoretically required). The duration of heating of the scrap lightweight is 16–19 min under this supply mode, which is 2-3 min faster than on base technology. The expected economic effect is 2.0-2.5 rubles per ton of steel produced. The invention method of heating solids in the converter, including the flow through the bottom tuyeres of fuel and oxidizer and at the same time flow through the top tuyeres of oxidizer and liquid fuel, so that, in order to reduce the heating period . the mixture to a predetermined average temperature, the consumption of oxidant supplied through the upper tuyeres is 10-30% of the theoretically necessary for complete combustion of liquid fuel, and the remaining amount of oxidant is fed through the bottom tuyeres, while the density of the liquid fuel supplied through the upper tuyeres is is 0.84-1.20 g / cm. Sources of information taken into account during the examination 1. USSR author's certificate 492550, cl. C 21 C 5/28, 4975.