Spray nozzle type reduction gas charging device of gas-based vertical furnace and method utilizing spray nozzle type reduction gas charging device

Abstract

The invention provides a spray nozzle type reduction gas charging device of a gas-based vertical furnace and a method utilizing the spray nozzle type reduction gas charging device. The spray nozzle type reduction gas charging device comprises a stuffing hole, gratings, a reduction gas ring tube, a plurality of reduction gas spray nozzles and oxidized pellets; the reduction gas ring tube is arranged around the gas-based vertical furnace; the plurality of the reduction gas spray nozzles are fixedly connected with the reduction gas ring tube, and extend towards a furnace hearth of the gas-based vertical furnace in the horizontal direction; the oxidized pellets are filled in the inner cavities of the reduction gas spray nozzles for carrying out catalytic reforming on reduction gas, so that high-reduction gas is obtained; the stuffing hole is formed in the reduction gas inlet ring tube; and the gratings are positioned at ends, positioned at one side of the furnace hearth, of the reduction gas spray nozzle. In this device, the medium-reduction gas in the furnace hearth is catalytically refined into high-reduction gas, so that the oxidized pellets in the furnace hearth of the vertical furnace are easily reduced into pellets with a high metallization ratio, and therefore, reduction reaction time is shortened, and production efficiency of the gas-based vertical furnace is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and ironmaking, and in particular relates to a nozzle-type reducing gas feeding device for a gas-based shaft furnace and a use method thereof. Background technique [0002] Direct reduced iron (DRI) is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. Direct reduced iron has a stable chemical composition and low impurity content. It is one of the substitutes for scrap steel. It is an indispensable impurity diluent for electric furnace smelting pure steel and high-quality steel. It is a high-quality coolant for converter steelmaking. missing raw materials. In 2014, the output of direct reduced iron in the world reached 74.5 million tons, and direct reduction ironmaking has been listed as one of the main directions for the development of my country's iron and steel industry. The technical method of producing direct reduced iron in this field is c...

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Problems solved by technology

However, in this process, the oxidizing component H contained in the medium reducing gas passed into the shaft furnace 2 O and CO 2 High content, greater than 10%, is not conducive to the improvement of the metallization rate of sponge iron in the shaft furnace, and high reducing gas is formed in the shaft furnace cavity, and it takes a long time for the reduction reaction to obtain a sponge iron product with a high metallization rate

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