Preheating method and device for sintering mixture

Abstract

The utility model discloses a steam preheating method for sinter mixtures and the device thereof, belongs to a sintering process in ferrous metallurgy, and helps to increase the heat exchange efficiency of steam preheating of sinter mixture, save the energy, increase the temperature of preheating the sinter mixture, reduce the energy consumption in sintering process, and increase the yield per machine hour. The technical proposal is that the superheated steam is produced by the waste heat from the sintering process and is introduced to a mixture bin; a steam chamber plate is fixed inside the bin and coupled with the inner wall of the bin, forming a steam chamber; the superheated steam is delivered to the steam chamber by using a branch pipe passing through the bin wall from a link ring pipe; all steam chamber plate are combined and encircled around the bin inner wall to form a ring-shaped preheating zone with heat exchange effect in double heat-conduction mode; and the mixture is pre-heated under the operational conditions (temperature rise up to 55-67 DEG C), thereby increasing the heat exchange efficiency. Compared with the prior art, the invention can increase the retreating temperature of mixture, reduce the solid fuel consumption for ore sintering by 3kg / t, and increase the yield per machine hour by 2 percent.

Description

Technical field: [0001] The invention relates to a sintering production process, in particular to a steam preheating process of a sintering mixture, which belongs to the black metallurgy sintering process technology. Background technique: [0002] The sintered ore used in the production of metallurgical blast furnaces is made of raw materials such as iron ore concentrate, mixed, preheated and sintered by a sintering machine. The preheating process of the mixture is a key link in the sintering process to save fuel and increase the output per unit hour, and most of them use steam to preheat. At present, the steam preheating of the sintering mixture usually uses the waste heat of the sintering process to generate steam, which is directly introduced into the mixer through the steam pipe, and the temperature of the mixture is increased by increasing the ambient temperature in the mixer. There is a short trip of a few minutes, generally 2-3 minutes, the heat exchange is insuffici...

AI Technical Summary

Problems solved by technology

At present, the steam preheating of the sintering mixture usually uses the waste heat of the sintering process to generate steam, which is directly introduced into the mixer through the steam pipe, and the temperature of the mixture is increased by increasing the ambient temperature in the mixer. There is a short trip of a few minutes, generally 2-3 minutes, the heat exchange is insufficient, in addition, the filling rate of the mixture in the mixer is low, only 11% to 13%, and the mixer is open, a large amount of heat is lost, heat exchange The efficiency is only 20-30%, and most of the energy is lost and wasted; another method for steam preheating of the sintered mixture is to introduce the energy steam pipe directly into the mixture mine tank, and the steam directly contacts the mixture to increase the preheating temperature of the mixture. However, due to the contact between the introduced steam and the mixture at the pipe point, the distribution is often uneven, causing the mixture to be locally over-humid, or even muddy. Due to the uneven temperature of the material, the quality of sintering production is affected, wasting energy, and the heat energy consumption per ton of sintering is large. The output of the machine is low, which is an unresolved problem in the current prior art

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