A waste heat recovery device and method for dry granulation of metallurgical slag

Abstract

The invention provides a device and a method for recovering residual heat by dry-process granulation of metallurgical slag. According to the device, a granulation system and a heat exchange system are systematically transformed, so that blocky slag and slag wool are greatly reduced and cooled slag particles obtained by granulation is relatively uniform in size distribution, relatively high in vitrification degree and good in sphericity and can be directly used as raw materials for producing subsequent products such as cement; the limitation on the slag feeding flow caused by a revolving cup is reduced, so that the rotary energy of the porous revolving cup in a rotary granulation process can be fully utilized, the porous revolving cup can run at a relatively high rotary speed and the granulation efficiency is improved; meanwhile, a two-stage residual heat recovery system is adopted, relatively high heat exchange efficiency and residual heat recovery rate are taken into account, and the problems of low granulation efficiency, relatively poor granulation effect, low heat exchange efficiency, influence on residual heat recovery and utilization and the like during a process for recovering residual heat by dry-process granulation of metallurgical slag in the prior art are solved.

Description

technical field [0001] The invention relates to the fields of metallurgical engineering, environmental protection and energy saving, mainly relates to energy saving and emission reduction in metallurgical processes, dry granulation of metallurgical slag, and in particular to a device and method for dry granulation of metallurgical slag. Background technique [0002] Metallurgical slag is a by-product obtained in the process of metal and alloy smelting in the metallurgical industry, and its output is huge. For example, about 350kg of slag is discharged for every ton of blast furnace pig iron produced, and about 30 tons of slag is produced for every ton of ferronickel produced. In addition, a large amount of slag is also discharged in converter steelmaking and other ferroalloy smelting. These metallurgical slags are generally discharged at a temperature of 1400~1700°C, and the sensible heat contained in each ton of slag is about 1.5GJ (1GJ=10 9 joules), which are high-quality...

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a waste heat recovery device for dry granulation of metallurgical slag, which can effectively solve the problem of existing problems by systematically transforming the granulation system and the heat exchange system. There are technical problems in the dry granulation waste heat recovery process of metallurgical slag, such as low granulation treatment efficiency, poor granulation effect, low heat transfer efficiency, and affecting waste heat recovery and utilization.

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