Method for treating slag through boiler steaming-water circulation process

Abstract

The invention provides a novel method for treating blast furnace slag and recycling slag heat energy and a device thereof. The novel slag treatment method is characterized in that a process of quenching and cooling slag via water is adopted, the slag is mechanically granulated, then water is sprayed to the slag, the slag is cooled by steam, saturated superheated steam is directly generated, then the steam passes through a heat accumulator or a boiler and is condensed into saturated water by a condenser, and a water pump is used for circulating the saturated water (steam) to cool the slag. According to the method, a process principle of high heat absorption in a water vaporization process is used; the processes of quenching the slag via water and vaporizing the water are combined with the boiler heat exchange theory; vaporization and condensation processes of water are cyclically utilized; the steam is used for taking away sensible heat of the slag; and the utilization of the slag heat is achieved. The slag treatment process of the method is completely carried out in a container in a sealing manner; the generated steam can carry pressure, can be directly output for use or can be output for use after exchanging heat for a second time. Compared with the existing wet treatment process of slag, the method has the advantages of water conservation, energy conservation, environment friendliness, high heat recycling efficiency and good economic benefit, and has value of practical application and popularization.

Description

technical field [0001] The invention belongs to the metallurgical slag treatment process and the secondary energy recovery technology, in particular to a process and a device for recovering and utilizing the metallurgical liquid slag treatment heat energy. Background technique [0002] A large amount of metallurgical slag is produced in the process of ironmaking and steelmaking, and these slags contain a large amount of sensible heat. According to the actual statistics of ironmaking blast furnace and steelmaking converter production in my country, about 280-400kg / t of blast furnace slag is produced per ton of iron smelting, and about 120-150kg / t of steel slag is produced per ton of steel smelting. These slags contain a large amount of obvious hot. According to the data, the enthalpy value per kilogram of blast furnace slag is about 1797.4KJ / kg, and the enthalpy value per kilogram of steel slag is about 2000KJ / kg. If the standard coal is calculated at 29260KJ / kg, the sensibl...

AI Technical Summary

Problems solved by technology

Although the new boiler steam-water circulation method slag treatment process also includes spraying water in the closed device and using the water vaporization process to take away the slag heat process, the principle, process, device structure, heat exchange boiler form, and steam used in the system process The results of power generation have undergone major changes, which belong to major structural and process improvements, so it is proposed again

Images