Afterheat recycling system utilizing slag-granule-jetting molten-slag-crushing process

Abstract

The invention is suitable for the field of molten slag dry process treatment, and provides an afterheat recycling system utilizing a slag-granule-jetting molten-slag-crushing process. The system comprises a dry cooling tower, a granulated slag bin and a blowing tank, wherein an opening is formed in the upper end of the dry cooling tower; an air inlet is formed in the lower end of the dry cooling tower; a hot air outlet is formed in the top of the dry cooling tower; a discharging port is formed in the bottom of the dry cooling tower; an collection bin is also arranged inside the dry cooling tower; the bottom of the collection bin is communicated with the discharging port; a slag trough and a spray gun are arranged at the opening; the spray gun is positioned below the outlet of the slag trough; the outlet of the granulated slag bin is connected with the blowing tank; compressed air is used as a fluidization and transmission medium, and the outlet of the blowing tank is communicated with the spray gun. According to the afterheat recycling system utilizing the slag-granule-jetting molten-slag-crushing process, by adopting a pneumatic transmission way, slag granules are jetted so as to crush molten slag, and heat exchange on the slag granules and the molten slag can be performed, so that the flow of the cooling air is reduced; moreover, the molten slag is easily crushed by the slag granules, the obtained hot slag layer has certain voidage, and therefore, full heat exchange is facilitated. According to the system, higher temperature of the hot air can be acquired, the afterheat recycling quality is improved, and the generating efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of slag dry treatment, and in particular relates to a waste heat recovery system for crushing slag by spraying slag particles. Background technique [0002] For a long time, the waste heat recovery of slag in the iron and steel metallurgical industry has been a worldwide technical problem. [0003] Blast furnace slag is the most important by-product of the iron and steel industry. About 300kg of blast furnace slag is produced per ton of iron, and the smelting temperature of slag is about 1450°C. It is a very high-quality heat source. At present, the treatment method of blast furnace slag at home and abroad mainly adopts the water quenching method, which uses water to impact and break the slag into slag particles for the production of cement. Although this process can realize the high added value of slag products. However, with the water quenching process, the high-temperature waste heat of the slag is conv...

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Problems solved by technology

However, in these two processes, in order to obtain slag products with satisfactory particle size and quality, a higher cooling rate is required, which will result in a larger cooling gas flow rate, lower quality of recovered waste heat, and lower power generation efficiency

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