Experimental study on utilization of waste heat cracking rubber powder from blast furnace slag in fluidized bed equipment

Qidong Sun ； Chuijie Yi ； Hao Zhang ； Hanfei Zhao ； Song Liu

《International Core Journal of Engineering》 7卷12期 (2021/12) Pp. 467-474

https://doi.org/10.6919/ICJE.202112_7(12).0064

摘要

After the high temperature slag particles made by dry granulation are used as heat in order to deal with the problems of insufficient utilization of waste heat and large volume of waste tires. A new idea of producing cracking oil, gas and carbon black by cracking rubber powder based on fluidized bed equipment was put forward to realize waste utilization, energy saving and environmental protection. The waste heat when the liquid blast furnace slag is granulated into high temperature particles is used as free heat source, and the cracking gas is used as heat carrier to transfer heat into the fluidized bed to realize the joint production of oil and gas. The process flow was designed and the influencing factors in the fluidized cracking process of rubber powder were analyzed, including cracking temperature, particle size of rubber powder, residence time and catalyst. It was found that when the cracking temperature was 550 degrees, 35% NaOH was used as catalyst and the residence time was 2 seconds, the highest oil yield was 51%. The smaller the particle size of rubber powder, the larger the ratio of cracking gas in the product. The yield of cracking gas can be improved when the blast furnace slag is used as catalyst, while the use of Fe powder and CaO catalyst can increase the ratio of carbon black in the product.

關鍵字

Used tires ； waste heat recovery ； the catalyst ； fluidized bed ； blast furnace slag

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