Blast furnace molten slag comprehensive utilization system and method

Abstract

The invention is suitable for the technical field of metallurgy waste heat recovery, and provides a blast furnace molten slag comprehensive utilization system and method. The blast furnace molten slagcomprehensive utilization system comprises a high-temperature molten slag heat insulation system, a cast slag heat exchanger system, a hot air waste heat exchange system and a high-temperature slag particle waste heat exchange system; the high-temperature molten slag heat insulation system is used for buffering the flow rate of high-temperature molten slag, keeping the temperature of the high-temperature molten slag to be the freezing point or above, and adjusting the output flow rate of the high-temperature molten slag; the cast slag heat exchanger system is used for quickly cooling the high-temperature molten slag entering a cast slag heat exchanger into glass slag pieces and exchanging enthalpy released in the high-temperature molten slag cooling process into hot air; and the hot air waste heat exchange system is used for exchanging the hot air enthalpy exchanged by the cast slag heat exchanger system into steam. According to the blast furnace molten slag comprehensive utilizationsystem and method, compared with a current universal water quenching method, when the high-temperature molten slag is processed into glass bodies, a large amount of high-quality enthalpy can be recycled, water is not used, the problems of alkaline water pollution and air pollution are solved, and the blast furnace molten slag comprehensive utilization energy-saving environment-friendly effect is really achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical waste heat recovery, and in particular relates to a comprehensive utilization system and method for blast furnace slag. Background technique [0002] my country is a country with a large steel production capacity. Based on the annual production of 700 million tons of iron, 210 million tons of blast furnace slag will be produced every year. The temperature of these blast furnace slags is above 1450 °C, and the sensible heat plus latent heat of melting is about 1.97GJ / t. , equivalent to 67.13kg standard coal, 1 1500Nm 3 The blast furnace produces about 550,000 tons of high-temperature slag per year. If the enthalpy of this part can be recovered by 70%, the recoverable heat will be 25,800 tons of standard coal and nearly 33,000 tons of raw coal. The country is converted into 1500Nm according to production capacity 3 The total number of blast furnaces in the country is more than 400, which can ...

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Problems solved by technology

[0007] The invention provides a system and method for comprehensive utilization of blast furnace slag, aiming to solve the problems of a large waste of energy and water sources and environmental pollution in the water quenching method

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