A method and device for improving the air permeability of ultra-thick material layer sintering

Abstract

The invention discloses a method and a device for improving super-thick bed layer sintering permeability. The method includes conducting primary material distribution and ignition when a head of a sintering machine passes through a first material distribution system and a first ignition system, wherein a fuel ratio of a distributed mixed material ranges from 3% to 4.5%; when a trolley runs to a position accounting for 1 / 3-1 / 2 of the total length of the sintering machine, conducting secondary material distribution and ignition through a second material distribution system and a second ignition system, wherein a fuel ratio of the distributed mixed material ranges from 4.5% to 6%; using the material loosening device for treating sinter on the surface before secondary distributing and sintering of the mixed material so as to form pores 30-50 mm in diameter and 80-120 mm in depth on the surface of the sinter; keeping the sum of the primary distributed material thickness and the secondary distributed material thickness not less than 900 mm but not more than 1300 mm, and keeping the ratio of the primary distributed material thickness to the secondary distributed material thickness between 1.25 and 2.5. The method has the advantages that the mixed material sintering permeability can be enhanced, fuel distribution in the mixed material is optimized, sinter yield is increased and solid fuel consumption in sintering is reduced.

Description

technical field [0001] The invention belongs to the technical field of sintering production, relates to super-thick material layer sintering, in particular to a method and device for improving the air permeability of super-thick material layer sintering. Background technique [0002] During the sintering production process, after the sintering mixture cloth is ignited on the trolley, it is sintered from the surface to the inside by the exhaust fan, and the sintering is completed from the surface to the grate surface of the sintering machine trolley. Air is a necessary condition for maintaining combustion. The amount of air drawn in from top to bottom directly affects the vertical sintering speed, which in turn affects the running speed of the sintering machine, the quality of sintered minerals and production efficiency. [0003] After the sintering mixture is ignited at high temperature, the surface of the material is rapidly melted and crusted and hardened, which affects th...

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Problems solved by technology

Technicians have done a lot of work to improve the air permeability of the material layer, control the appropriate raw material alkalinity level and moisture content, strengthen the granulation of the mixture, and mix large particles into the sintering material, but it still cannot meet the sintering production of ultra-thick material layer needs, which limit the output and quality of sinter

[0005] In order to improve the technical and economic indicators of sintering production, including output, quality, energy consumption and equipment life, etc., many explorations have been made on super-thick (material layer height exceeding 800mm) material layer sintering: but it still uses one-time ignition and high Negative pressure, large air flow direct-flow ventilation operation, trying to increase the thickness of the material layer in this way, but in fact, one ignition often makes the surface of the thick material layer melt, so that the gaps between the material layer particles are blocked, and the resistance of the entire material layer In order to maintain the operation, the negative pressure and air volume of the fan must be increased. As a result, on the one hand, the local short circuit of the air flow is caused, and the entire material layer cannot be sintered evenly. The expected purpose, so far no progress has been made, and no breakthrough has been made in the exploration of technicians in the direction of ultra-thick material layer sintering

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