Liquid molten slag dry-type centrifugal granulation and afterheat recycle system having molten slag buffer-storage and flow control functions

Abstract

The invention discloses a liquid molten slag dry-type centrifugal granulation and afterheat recycle system having molten slag buffer-storage and flow control functions. The system comprises a molten slag buffer-storage and flow control unit, a granulation unit, a mobile bed unit and an afterheat utilization unit; the molten slag buffer-storage and flow control unit is arranged at the upper part ofthe granulation unit and is used for buffer-storage of the liquid molten slag and controlling the flow rate and speed of the liquid molten slag falling to the granulation unit; the granulation unit is used for granulating the falling liquid molten slag; the mobile bed unit is arranged at the lower part of the granulation unit and is used for cooling and temporarily storing the granulated molten slag; hot air inside the granulation unit and the mobile bed unit communicates with the afterheat utilization unit; and the afterheat utilization unit comprises a hot air flue, a primary dust collector, an afterheat boiler, a secondary dust collector, an exhaust fan and a chimney which are arranged in sequence. The system disclosed by the invention does not use water resources, is free of environmental pollution, can effectively recycle high-quality afterheat resources contained in the high-temperature liquid molten slag, and can meet the urgent requirements of energy conservation and emissionreduction of the present steel and iron industry.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery of blast furnace slag, in particular to a liquid slag dry type centrifugal granulation and waste heat recovery system with the functions of slag buffering and flow control. Background technique [0002] China is currently the world's largest steel producer. In 2016, China's pig iron output was about 701 million tons, accounting for about 60% of the world's total output. In the process of smelting pig iron, blast furnace slag containing huge heat will be produced. The temperature of blast furnace slag is generally between 1400 ~ 1550 ℃, and each ton of slag contains (1260 ~ 1880) × 10 3 The sensible heat of kJ is equivalent to 60kg standard coal. Under the current ironmaking technology in my country, 0.3 tons of blast furnace slag is produced by producing 1 ton of pig iron. Based on the current pig iron production of 701 million tons in my country, it can be converted into more than 2...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a liquid slag dry type centrifugal granulation and waste heat recovery system with the functions of slag buffering and flow control, so as to solve the mismatch between the intermittent slag discharge of the blast furnace and the continuous operation of the granulation waste heat recovery process, and prevent falling The broken slag pipe and high-temperature granulated slag particles stick to the wall, ensuring uniform and non-bonded material layer in the moving bed, smooth slag discharge and high waste heat recovery efficiency of the system, providing guidance for the industrial application of dry centrifugal granulation technology

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