Influence of Interactions among Polymeric Components of Automobile Shredder Residue on the Pyrolysis Temperature and Characterization of Pyrolytic Products

Abstract

Pyrolysis and gasification have gradually become the main means to dispose of automobile shredder residue (ASR), since these methods can reduce the volume and quality of landfill with lower cost and energy recovery can be conducted simultaneously. As the ASR pyrolysis process is integrated, the results of pyrolysis reactions of organic components and the interaction among polymeric components can be clarified by co-pyrolysis thermogravimetric experiments. The results show that the decomposition mechanisms of textiles and foam are markedly changed by plastic in the co-pyrolysis process, but the effect is not large for rubber and leather. This effect is mainly reflected in the pyrolysis temperature and pyrolysis rate. The pyrolytic trend and conversion curve shape of the studied ASR can be predicted by the main polymeric components with a parallel superposition model. The pyrolytic product yields and characterizations of gaseous products were analyzed in laboratory-scale non-isothermal pyrolysis experiments at finished temperatures of 500 °C, 600 °C, and 700 °C. The results prove that the yields of pyrolytic gas products are determined by the thermal decomposition of organic substances in the ASR and final temperature.

Py–FTIR–GC/MS Analysis of Volatile Products of Automobile Shredder Residue Pyrolysis

“…The yields of volatile products of ASR pyrolysis varied greatly with changing pyrolysis temperature. Considering that plastic and textiles account for a high proportion of ASR, and other organic matter is affected by them during the pyrolysis process [ 21 ], the design of pyrolysis temperature can refer to the pyrolysis characteristics of plastics and fibers. Since most volatile products are chemically unstable, more syngas with a greater calorific value could be obtained by catalytic pyrolysis and gasification [ 36 , 37 , 38 ].…”

“…Extensive experimental research into ASR pyrolysis by other authors [ 15 , 16 , 17 , 18 , 19 , 20 ] has shown CO, CO 2 , H 2 , and light hydrocarbons (C1–C4, such as CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , C 3 H 6 ) as the dominant constituents of HHV gas. We also studied the pyrolytic product yields and characterizations of gaseous products (H 2 , CO, CO 2 , CH 4 , C 2 H 4 , C 2 H 6 , C 3 H 6 and C 3 H 8 ), which were analyzed in laboratory-scale non-isothermal pyrolysis experiments at finished temperatures of 500, 600, and 700 °C [ 21 ]. Moreover, we found that the pyrolytic reaction was insufficient in primary ASR pyrolysis, and the yield and calorific value of HHV gas are limited.…”

“…Since the yield of gaseous product is low, however, the yield of tar and char are always higher. Our previous results show that tar and gas accounted for 39.68 and 19.76% of the pyrolysis product when the pyrolysis temperature was set to 600 °C [ 21 ].…”

A Multifaceted Approach for Cryogenic Waste Tire Recycling

“…Chemical processing methods lead to irreversible chemical changes not only in rubber, but also in the constituent substances (vulcanizers, softeners, plasticizers, etc.). These methods are carried out at high temperatures resulting in material destruction [ 18 , 19 , 20 , 21 , 22 ]. Despite the fact that chemical methods of waste rubber recycling make it possible to obtain valuable products and heat, such use is not efficient enough, since it does not allow preserving the original polymer materials.…”

Interactions between Automotive Shredder Residue and Olivine Bed Material during Indirect Fluidized Bed Gasification

“…Different methods for energy recovery from ASR have been investigated in the literature, including incineration, pyrolysis, and gasification. ,,− The outcomes of the performed studies reveal that thermal conversion of ASR is associated with various environmental and technical issues . One of the major environmental concerns is that polychlorinated dibenzo- p -dioxins (PCDDs) and dibenzofurans (PCDFs) can form during incineration, and they need to be controlled and treated before the exhaust gases are released into the environment. − Currently, dioxin- and furan-containing compounds are treated using calcium-based filters and activated carbon, which results in higher operational costs. ,, The costs associated with gas treatment can be reduced by inhibiting the formation of dioxins, which can be achieved by varying the amount of oxygen present during combustion, decreasing the presence of species that catalyze dioxin formation, and adjusting the reactor temperature and residence time of the gas during the thermal conversion process .…”