Molten slag mechanical centrifugal graining system and method

Abstract

The invention provides a molten slag mechanical centrifugal graining system and method. The molten slag mechanical centrifugal graining system comprises a tundish, a slag discharging adjusting deviceand a graining unit; liquid level detection devices are sequentially arranged on the side wall of the tundish from top to bottom; the slag discharging adjusting device is used for adjusting the size of a slag outlet, and the graining unit is arranged right below the slag outlet and is used for graining the molten slag; the molten slag mechanical centrifugal graining system further comprises an intelligent control unit, and the intelligent control unit is connected with the liquid level detection devices, the slag discharging adjusting device and the graining unit. Through the arrangement of the liquid level detection devices, the size of caliber is controlled according to detected liquid level signals, the control of the slag discharge flow of the slag outlet of the tundish can be realized, the granulating speed is set according to the flow, better matching of the slag flow and the graining rotation speed can be achieved, granulation can be uniform, slag wool or larger massive solids generated by granulated particles can be less or avoided, and better granulation effect can be achieved.

Description

technical field [0001] The present disclosure relates to the related technical field of liquid slag processing, and in particular, relates to a liquid slag mechanical centrifugal granulation system and method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] High-temperature slag, as the main by-product in the ironmaking process, is a high-grade heat source that has not been fully utilized at present. Its discharge temperature is between 1400 and 1550 °C, and each ton of high-temperature liquid slag contains about 60kg of standard coal. Heat is a high-quality waste heat and energy resource, but due to its physical properties, such as large viscosity changes with temperature and low thermal conductivity, it has not been well recycled. The current high-temperature slag treatment method is the water quenching method, which is to directly pa...

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Problems solved by technology

The current treatment method has a series of disadvantages: the sensible heat of high-temperature slag at 1400-1550 °C has not been recycled, a lot of water resources are wasted, and a large amount of SO is produced during the process of water washing slag 2 、H 2 S and other harmful gases and fine particles

On this basis, the dry mechanical centrifugal granulation heat recovery process has attracted extensive attention from experts in related fields. In the dry mechanical centrifugal granulation heat recovery process, the key step is to obtain fine and uniform particles, but in the actual process, Due to the nature of the slag itself, the granulation quality of the obtained slag particles is difficult to reach the target value, and slag wool or larger massive solids are often produced, which greatly reduces the operation continuity and heat exchange efficiency of the equipment.

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