Dry granulation and afterheat recovery system of blast-furnace slag

Abstract

The invention discloses a dry granulation and afterheat recovery system of blast-furnace slag and relates to a blast-furnace slag treatment system, aiming to provide a dry granulation and afterheat recovery system of blast-furnace slag, which has the advantages of low energy consumption, low water consumption, low harmful gas emission, high afterheat recovery rate and stable running. The dry granulation and afterheat recovery system of the blast-furnace slag comprises a tunable swelling slag bead chute, a swelling slag bead throwing roller and a swelling slag bead afterheat recovery device, wherein the tunable swelling slag bead chute comprises an upper swelling slot and a lower swelling slot; the swelling slag bead throwing roller comprises a roller body with a power device; the swelling slag bead afterheat recovery device comprises a channel structure and a heat exchange system, and the channel structure comprises a top wall, a front side wall, a rear side wall and a bottom wall; the roller body of the swelling slag bead throwing roller is positioned below the lower end of the lower swelling slot of the tunable swelling slag bead chute; the channel structure of the swelling slag bead afterheat recovery device corresponds to the roller body; and the left end of the bottom wall is positioned within the throwing range of the swelling slag bead throwing roller.

Description

technical field [0001] The invention relates to a blast furnace slag treatment system, in particular to a system for blast furnace slag dry granulation and waste heat recovery process. Background technique [0002] Blast furnace slag is a silicate material with good performance. It can be used as a raw material for the production of building materials and fertilizers. At the same time, the temperature of liquid high-temperature slag is between 1350 ° C and 1500 ° C. It is a high-grade waste heat resource with high recycling value. At present, my country's liquid blast furnace slag is mainly quenched by water flushing slag, and the blast furnace slag after water cooling can be used to manufacture cement and other building materials. A large amount of hydrogen sulfide and sulfur oxide gases are discharged into the atmosphere along with the water vapor, causing environmental pollution. Each ton of slag is processed to produce 800m3 3 water vapor, where H 2 S content 19mg / m 3...

AI Technical Summary

Problems solved by technology

At present, my country's liquid blast furnace slag is mainly quenched by water flushing slag, and the blast furnace slag after water cooling can be used to manufacture cement and other building materials. A large amount of hydrogen sulfide and sulfur oxide gases are discharged into the atmosphere along with the water vapor, causing environmental pollution. Each ton of slag is processed to produce 800m3 3 water vapor, where H 2 S content 19mg / m 3 , SO 2 Content 4.3mg / m 3 ; The waste heat of the slag has not been effectively recycled; the moisture content of the water slag is high, and it still needs to be dried as a cement raw material, which requires a certain amount of energy; the investment and operation costs of the system are high, and a blast furnace with a daily output of 2,500 tons needs to be built. Two sets Water flushing slag equipment, construction investment is about 40 million yuan; in the process of water flushing slag, slag with high iron content is easy to cause explosion; and the use of water slag is relatively single

The last step is to use the waste heat recovery device to concentrate and recover the heat energy in the high-temperature slag beads, and then the first condition for heat exchange of the slag beads in the dry granulation process is that the slag beads cannot be in direct contact with the heat exchange medium, and It is also necessary to ensure a high heat exchange rate, so ordinary heat exchange devices cannot meet the above basic requirements

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