Method and device for preparing tar cracking catalyst through liquid blast furnace slag granulation

Abstract

The invention provides a method and device for preparing a tar cracking catalyst through liquid blast furnace slag granulation. The device is characterized by comprising a conical granulating device, a spraying device and an overflow type water cooling wall, iron ore powder with the mass fraction of 10%-20% is added to slag before granulation, the slag extends on the surface of the conical granulating device to form a film in the granulating process, the film is air-quenched into small particle drops under the effect of a high-pressure jet flow, then bumps with crushing blades for secondary crushing, is further air-quenched and granulated by a spirally rising airflow and finally falls onto the surface of the overflow type water cooling wall to perform heat exchange with a flowing water film for cooling. The device is compact in structure, integrates centrifugal granulation, mechanical crushing, air quenching and water cooling modes and can achieve efficient granulation and rapid heat exchange of liquid slag, and no mutual bonding occurs in the granulated slag output process. The slag granulating rate is 90% or above by adopting the method, a surface pore structure is developed, the active component content is high, and the tar cracking catalyst is an efficient biomass tar cracking catalyst.

Description

technical field [0001] The invention relates to the field of energy recovery and utilization, in particular to a method and device for producing a tar cracking catalyst by granulating liquid blast furnace slag. Background technique [0002] Blast furnace slag is the main by-product of the iron and steel production process, rich in heat, 0.3-0.6 tons of slag is produced for every ton of pig iron produced, and each ton of slag contains about (1.26-1.88)×10 6 Sensible heat in kJ. The residual heat contained in the slag is high but its taste is low. At present, no effective recovery and utilization methods have been found. [0003] The water quenching process is currently the most widely used method for blast furnace slag treatment. The subsequent use of water slag is mature, but there is basically no recovery of sensible heat of slag, resulting in a huge waste of energy and water resources. The dry sensible heat recovery technology of blast furnace slag has a good prospect. A...

AI Technical Summary

Problems solved by technology

Liquid blast furnace slag is a kind of multi-component metal melt. The slag particles formed after dry granulation can not only be used as an additive in the cement industry, but also can be used as a catalyst for the degradation of biomass tar. The cracking of tar has a certain catalytic effect. However, due to the low content of its main active component, iron oxide, its catalytic activity is reduced to a certain extent

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