High-temperature liquid slag heat energy extraction method

Abstract

The invention relates to a high-temperature liquid slag heat energy extraction method. The method includes the following steps that high temperature slag liquid of a blast furnace is distributed to inside of slag grooves or slag tanks through a branch slag runner and is discharged out of slag outlets in the lower portions of the slag grooves or the slag tanks to enter a gas or water jet cutter cut-off device; the high temperature slag liquid of the blast furnace is cut off at flashing speed through gas or a water jet cutter to obtain slag particle columns with certain lengths; sections of the cut-off slag particle columns vertically enter a rapid cooling pipe and are rapidly cooled through cooling gas sprayed out of the rapid cooling pipe, so that the surfaces of the slag particle columns are hardened; the slag particle columns with the hardened surfaces are guided into an air cooling barrel through an inclined pipe for heat exchange under the action of gravity; cooling air is blown into the air cooling barrel from the bottom of the air cooling barrel, the cooling air moves upwards among gaps of the slag particle columns when the slag particle columns move downwards, so that the slag particle columns are gradually cooled, and then the slag particle columns are discharged through a discharging mechanism of the air cooling barrel; the cooling air is constantly heated and forms high-temperature air which is then delivered into a boiler for power generation; and the cooled slag particle columns are delivered into a material chamber through a belt and used for producing thermal insulation materials and light materials or being ground into powder to serve as a blending agent in the cement industry.

Description

technical field [0001] The invention relates to a new technology in the field of metallurgical system environmental protection, which is a method for extracting heat energy from high-temperature liquid slag. Background technique [0002] Ironmaking blast furnace is an industrial furnace for producing molten iron. Its main raw materials are iron ore and coke. During the production process, molten iron and blast furnace slag are produced. After the blast furnace slag is released, it passes through the slag discharge ditch and enters the water-cooled slag flushing ditch. The high-temperature slag is cooled rapidly by water cooling. , into blast furnace slag, blast furnace slag is finely ground into superfine powder, used as admixture in cement plant or concrete mixing station. [0003] At present, the output of blast furnace slag is calculated as about 500 kilograms per ton of molten iron. For a steel company with a scale of 10 million tons, the amount of blast furnace slag is ...

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Problems solved by technology

[0004] The object of the present invention is to provide a method for extracting heat energy from high-temperature liquid slag in order to overcome the problem that the heat energy in the prior art is difficult to utilize

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