SU1564198A1 - Drying section of roasting conveyer machines - Google Patents

Abstract

The invention relates to the production of iron ore in ferrous metallurgy, namely the production of agglomerated materials on conveyor-type kiln machines. The purpose of the invention is to improve product quality and reduce fuel and energy costs. The drying section consists of a hearth 1 of the first stage with blast chambers 2, a horn of the third stage with a blast and vacuum chambers 4 and 5, a transfer manifold 6 with an outlet section 7. Improved product quality and reduced fuel and energy costs are due to an additional blowing chamber installed under the exit section of the collector with an output cross-section area of 0.30-0.55 of the second stage cross-sectional area. 1 ill., 1 tab.

Description

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The invention relates to the production of iron ore raw materials in ferrous metallurgy, namely the production of agglomerated materials on annealing conveyor-type machines;

The aim of the invention is to improve product quality and reduce fuel and energy costs.

The drawing shows a schematic diagram of a section for drying pellets of roasting conveyor machines.

The drying section consists of a hearth 1 of the first degree with blast chambers 2, a horn 3 of the second stage with blast and vacuum chambers 4 and 5, a transfer manifold 6 with an outlet section 7.

The device works as follows.

Raw pellets are subjected to two-stage drying before high-temperature treatment. In the first stage, as a drying agent, the heat carrier flowing from the subsequent sections with a temperature of 250-300 ° C is used. This coolant is fed into the blast chambers 2, blown through a layer of wet pellets, removed from it by evaporation of 43% of the moisture of the pellets, sent to the hearth 1 and discharged from the system. supplied from the overflow collector 6 through its outlet section 7 and recirculated gases (250-300 ° C) supplied through the blowing chamber 40 Both gas streams are mixed in opposite jets with the same gas-dynamic parameters of both jets. The energy carrier with a temperature of 550 ° C, obtained with a uniform temperature potential, is sucked through a layer of pellets, completing the removal of moisture from them by 94-96%, is fed into chambers 5 and is also dropped from the system

Effect of conditions of mixing of gas flows in the second stage furnace

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drying on the performance indicators of the latter is given in the table.

As can be seen from the data presented in the table, the device works most effectively at the following structural ratios; the area of the blowing chamber 4 should be 0.30-0555 of the area of the hearth 3, for example, when the area of the chamber 4 is 0.28 of the area of the hearth 3, the fines content in the upper horizon of the pellet layer increases by 95.3%, and the specific heat consumption per process - by 3% With chamber area 4, equal to 0.57 of the hearth 3, the specific productivity of the process increases by 2.5%, and fuel-- energy costs - by 180 kcal / ton of raw pellets (5%). At the same time, the drying rates do not improve.

The use of the invention ensures the formation of coolant directly in the second-stage furnace without burning external fuel, improving the quality of the calcined pellets (in particular, reducing the fines content by 0.8-1.2%) and reducing the fuel and energy costs of the process (for fuel by 7-11% ), which, in turn, provides a reduction in the cost of finished products.

Claims (1)

Invention Formula The drying section of roasting conveyor machines, containing the first and second stages of drying with hearths and blowing and vacuum chambers, the overflow, collector with outlet section into the forge of the second stage of drying, characterized in that, in order to improve product quality and reduce fuel and energy costs, the drying section provided with an additional blast chamber installed under the exit section of the collector with an output section area of 0.30-0.55 second-section area, 0.78 0.82 no 13.5 14.50.30 16,00,33 26,50,55 27,50,57 Located in front of the package of vacuum chambers. no 0.28 3480 3240 10.4 8.4 217 215 4.3 4.1 4.1 4.4 220 215 218 217