System and control method for liquid slag dry type centrifugal pelletizing and waste heat recycling

Abstract

The invention discloses a system and control method for liquid slag dry type centrifugal pelletizing and waste heat recycling. The system comprises a liquid slag draining unit, a liquid slag temporary storage and flow control unit, a liquid slag pelletizing and waste heat recycling unit, and a waste heat utilizing unit. By the adoption of the system and the control method, the temperature and flow of liquid slag entering a pelletizing bin, the liquid slag pelletizing particle size and the moving bed slag discharging temperature can be strictly controlled, thus, the overall technological requirements of the technology are met, and the effect that the system for liquid slag dry type centrifugal pelletizing and waste heat recycling and utilizing operates safely and reliably is guaranteed. All high-quality waste heat resources contained in the high-temperature liquid slag are not wasted, no water resource is consumed, environment pollution is avoided, and the urgent requirements of the current iron and steel industry for energy saving and emission reduction can be met.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery of blast furnace slag, and in particular relates to a system and control method for dry centrifugal granulation and waste heat recovery of liquid molten slag. Background technique [0002] China is currently the world's largest steel producer, and its steel output has remained the world's largest for 17 consecutive years. In 2015, the output of pig iron in China was 691 million tons. During the process of smelting pig iron, blast furnace slag containing huge heat will be produced. The temperature of blast furnace slag is generally between 1400 ~ 1550 ℃, and each ton of slag contains (1260 ~ 1880) × 10 3 The sensible heat of kJ is equivalent to 60kg standard coal. Under the existing ironmaking technology in my country, 0.3 tons of blast furnace slag is produced for every ton of pig iron produced. Based on the current pig iron production in my country of 691 million tons, it can be equ...

AI Technical Summary

Problems solved by technology

The dry slag pit cooling method and water flushing slag method commonly used at present not only waste all the high-quality waste heat resources contained in the high-temperature liquid slag, but also consume a large amount of water resources and cause serious pollution to the environment. These treatment methods can no longer adapt to the current situation. Urgent demand for energy saving and emission reduction in the steel industry

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