Melting furnace slag quenching dry type granulation and sensible heat recovery generating system and method using same

Abstract

The invention provides a melting furnace slag quenching dry type granulation and sensible heat recovery generating system and a method using the same and belongs to the technical field of steel metallurgy furnace slag treatment and complementary energy recovery. The melting furnace slag quenching dry type granulation and sensible heat recovery generating system provided by the invention comprisesa slag-receiving device, a high-pressure water-air pulverization furnace slag quenching and granulating device, a furnace slag slow-cooling device, a sensible heat recovery generating device and a waste gas purification treatment device. According to the invention, the melting furnace slag is quenched and granulated by utilizing the high-pressure water-air pulverization device, so that the melting furnace slag is rapidly cooled to be in a glassy state; and then through a water-cooled type vibration grid plate, the melting furnace slag in the glassy state is further subjected to heat exchange with cold air so as to facilitate the subsequent recovery of the sensible heat. By the system provided by the invention, the melting furnace slag is quenched and granulated, and the high-temperature sensible heat resource of the furnace slag is sufficiently recovered and is used for generation on the basis that the water activity quality of the furnace slag is not influenced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical slag treatment and residual energy recovery, and relates to a system and method for quenching dry granulation of molten slag and recovering sensible heat for power generation. Background technique [0002] The energy consumption of China's iron and steel industry accounts for 10-15% of the country's total energy consumption. At present, the resource and energy consumption of the ironmaking process in the long process of iron and steel production is the largest, accounting for about 77% of the entire iron and steel production process. According to research and statistical data at home and abroad, a large amount of slag will be produced in iron and steel production, 0.3-0.6 tons of blast furnace slag will be produced for every ton of pig iron produced, and 0.13 tons of steel slag will be produced for every ton of steel produced. The initial temperature of the above-mentioned mol...

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Problems solved by technology

[0004] The main defects of the water quenching method are: (1) a large amount of fresh water is consumed, wasting water resources; (2) the sensible heat of slag is not recovered, and waste heat resources are seriously wasted; (3) air pollution (SO 2 , H 2 S and other gaseous sulfides); (4) The system maintenance workload is large; (5) During grinding, the slag must be dried, which still consumes energy

Therefore, the domestic market space for molten slag dry granulation and sensible heat recovery technology is huge and still blank

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