Relevance of the composition of municipal plastic wastes for metallurgical coke production

FUEL

卷:90

Article

Melendi, S.¹  Diez, M. A.¹  Alvarez, R.¹  Barriocanal, C.¹ 

[1] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain

关键词: Coal;    Plastic wastes;    Rheology;    Coking pressure;    Metallurgical coke;   

DOI  :  10.1016/j.fuel.2011.01.011

来源: Elsevier

【 摘 要 】

This study is concerned with the effects of the composition of mixed plastic wastes on the thermoplastic properties of coal, the generation of coking pressure and the quality of the resulting cokes in a movable wall oven at semipilot scale. The mixed plastic wastes were selected to cover a wide spectrum in the relative proportions of high-and low-density polyethylenes (HDPE and LDPE), polypropylene (PP), polystyrene (PS) and polyethylene terephthalate (PET). From the results it was deduced that the reduction in Gieseler fluidity in the coal blend is linked to the total amount of polyolefins in the waste. It was also found that these thermoplastics increase the pressure exerted against the wall in the course of the coking process and that coke quality is maintained or even improved. However, when the level of aromatic polymers such PS and PET are increased at the expense of polyolefins, the coking pressure decreases. Thus, the amount of aromatic polymers such as PS and PET in the waste is critical, not only for controlling Gieseler fluidity and coking pressure, but also for avoiding deterioration in coke quality (reactivity towards CO2 -CRI- and mechanical strength of the partially-gasified coke -CSR-). An amount of polyolefins in the waste lower than 65 wt.% for a secure coking pressure is established. (C) 2011 Elsevier Ltd. All rights reserved.

【 授权许可】

Free