Device and method for granulating blast furnace slag and recycling waste heat

A waste heat recovery and blast furnace slag technology, which is applied in recycling technology, steam engine devices, lighting and heating equipment, etc., can solve problems such as high equipment cost and energy consumption, secondary pollution of air and water sources, and low treatment efficiency
CN113322360APending Publication Date: 2021-08-31SHANGHAI MEISHAN IRON & STEEL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI MEISHAN IRON & STEEL CO LTD
Publication Date
2021-08-31

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Abstract

The invention discloses a device and method for granulating blast furnace slag and recycling waste heat. The device comprises an aerial fog granulation nozzle assembly, a fluid director (7), a cyclone separator (8) and a waste heat recoverer. The aerial fog granulation nozzle assembly comprises a slag flow controller (2), a compressed air flow control valve (3), a water quantity control valve (4) and an aerial fog spray gun (5). Mixing heat exchange of medium-temperature gas and high-temperature granular slag (6) and solidification of the high-temperature granular slag are realized in the fluid director, and the medium-high-temperature gas and the high-temperature granular slag after heat exchange are guided into the cyclone separator. The cyclone separator is used for separating medium-high-temperature gas and high-temperature granular slag and conveying the medium-high-temperature gas and the high-temperature granular slag into the waste heat recoverer. Complete granulation of the blast furnace slag is achieved, slag sensible heat recovery is organically coupled with sludge drying, high-temperature steam preparation, power generation and low-temperature hot water preparation, waste heat recovery of medium-temperature gas and high-temperature granulated slag in the slag granulation treatment process is achieved, and the waste heat recovery and utilization efficiency is improved.
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Description

technical field

[0001] The invention relates to a metallurgical slag processing equipment and method, in particular to a blast furnace slag granulation and waste heat recovery and utilization device and method. Background technique

[0002] Blast furnace slag is the main by-product of blast furnace ironmaking, and the amount of blast furnace slag produced per ton of iron is about 350 kg. The discharge temperature of blast furnace slag is 1450℃~1550℃, and the sensible heat carried by tons of slag ((1260-1880)×10 3 kJ) is equivalent to the calorific value of 60kg of standard coal, which has high recovery value.

[0003] At present, the treatment of blast furnace slag mostly adopts the water quenching process. The slag is washed into water slag by high-pressure water, and the high-grade sensible heat is transferred to the water slag and wastewater at about 80 °C, which loses the value of recycling. In addition, each ton of molten slag needs to consume 0.4 to 0.5 tons of water...

Claims

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