Slag dry granulation waste heat recovery device with self-regulating and anti-slagging functions

Abstract

The invention discloses a slag dry granulating waste heat recovery device with self-adjusting and anti-clogging functions. The device comprises a slag tundish and a granulating cavity, and a centrifugal granulator is arranged in the granulating cavity. The device is characterized in that a gas quenching air chamber is arranged on the outer side of the centrifugal granulator, a gas quenching air ring is arranged on the outer side of a rotor cup, a plurality of gas quenching air holes are circumferentially arranged in the top of the gas quenching air ring, the gas quenching air ring is communicated with the gas quenching air chamber, a high-pressure air ring is arranged on the inner wall of the granulating cavity, high-pressure nozzles are circumferentially arranged on the high-pressure air ring, an annular bubbling fluidized bed is arranged in the granulating cavity and positioned on the outer side of the gas quenching air chamber, an annular spouted bed is arranged on the outer side of the annular bubbling fluidized bed, a plurality of partition plates are circumferentially arranged in the annular spouted bed and divide the annular spouted bed into a plurality of independent spouted beds, and slag discharge ports are formed in the bottoms of the annular bubbling fluidized bed and the annular spouted bed. The device can be widely applied to the field of steel, metallurgy and the like.

Description

technical field [0001] The invention relates to a waste heat recovery device, in particular to a slag dry granulation waste heat recovery device with self-regulation and anti-slagging functions. Background technique [0002] Blast furnace slag with a temperature as high as 1450-1550°C is produced during the blast furnace ironmaking process, which is the main by-product in the ironmaking process. Due to the high slag discharge temperature of blast furnace slag, it contains a lot of heat. In 2015, the global output of crude steel reached 1.153 billion tons. If calculated on the basis of 0.3 tons of blast furnace slag produced for every ton of pig iron produced, the global output of blast furnace slag in 2015 was 346 million tons, and the heat contained in each ton of blast furnace slag can reach 1.6GJ , which is equivalent to the calorific value of 55kg of standard coal, so the heat in blast furnace slag produced around the world in 2015 is equivalent to the calorific value of...

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Problems solved by technology

The current blast furnace slag treatment method is the water quenching method, which cannot recover the heat in the blast furnace slag and will cause waste of water resources

Among the dry granulation methods of blast furnace slag that have been proposed, the centrifugal granulation waste heat recovery method has received extensive attention due to its simple and compact structure. However, there are still unsatisfactory granulation effects and sticky wall and slagging, the quality of particles is not high enough, and the phenomenon of flow fluctuation will inevitably occur during the process of slag feeding. The centrifugal granulator with fixed speed cannot meet the particle size requirements of granule products, and may also aggravate slag cotton and The generation of slag has become a technical bottleneck restricting the industrialization of this method

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