Device and method for dry-method treatment for and sensible heat recovery of high-temperature molten slag

Abstract

The invention discloses a device and a method for dry-method treatment and sensible heat recovery of high-temperature molten slag. The device comprises a chain grate, a water-cooling wall, a slag-scraping plate, a slag particle collector and a waste heat recovery device, wherein a first drive chain wheel of the chain grate is located below a tundish; the water-cooling wall is located above a grate plate; a gap is reserved between one end of the slag-scraping plate and the grate plate, and the slag particle collector is arranged below the other end of the slag-scraping plate; a crusher and the waste heat recovery device are arranged at the bottom of the slag particle collector. The method comprises the following steps of: starting the chain grate, and placing the high-temperature molten slag on the grate plate on the upper part of the chain grate via the tundish; separating the high-temperature molten slag from the grate plate by the slag-scraping plate after cooling and solidifying; conveying the high-temperature molten slag into the slag particle collector; and then conveying the high-temperature molten slag into the crusher, and conveying the high-temperature molten slag into the waste heat recovery device after crushing. The method disclosed by the invention has the characteristics of being simple to operate, few in environment pollution, low in process cost, and the like, as well as has a good application prospect.

Description

technical field [0001] The invention relates to high temperature slag utilization technology, in particular to a device and method for dry treatment of high temperature slag and recovery of sensible heat. Background technique [0002] In the field of industrial production, high-temperature slag exists widely, such as blast furnace slag, converter slag, molten nickel slag, copper slag, etc. in the metallurgical industry. The output of this part of slag is huge, the temperature is high, and it is a high-grade waste heat resource. At present, most of these waste heat resources have not been recycled. In the context of energy saving and emission reduction, it is of great significance to actively develop high temperature slag technology. The following takes the blast furnace slag with the largest output as an example to describe it in detail. [0003] Blast furnace slag is a by-product of blast furnace ironmaking. The domestic annual output is measured in hundreds of millions ...

AI Technical Summary

Problems solved by technology

[0006] The existing high-temperature slag dry treatment process mostly adopts the mechanical method to granulate the high-temperature slag into small particles, and then cools and recovers the waste heat; some of the treatment methods have good cooling effect, and the obtained slag has a high glass content and can also be recycled Most of the waste heat; but because the slag needs to be granulated first, slag wool is easy to form during the granulation process; in addition, some high-temperature granulation equipment has a large footprint, high power consumption (such as wind crushing method), and equipment structure Complicated (such as centrifugal granulation method), waste heat recovery rate needs to be improved, etc., there is still a distance from industrial application

Images