Transformation of nitrogen, sulfur and chlorine during waste tire pyrolysis

被引:61
作者
Cheng, Zhanjun [1 ,2 ]
Li, Miao [1 ]
Li, Jiantao [1 ]
Lin, Fawei [1 ,2 ]
Ma, Wenchao [1 ,2 ]
Yan, Beibei [1 ,2 ]
Chen, Guanyi [3 ]
机构
[1] Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China
[2] Minist Educ, Key Lab Efficient Utilizat Low & Medium Energy, Tianjin Key Lab Biomass Waste Utilizat, Tianjin 300072, Peoples R China
[3] Tianjin Univ Commerce, Sch Mech Engn, Tianjin 300134, Peoples R China
基金
国家重点研发计划;
关键词
Waste tire; Pyrolysis; N/S/Cl distribution; Heating rate; TYRE PYROLYSIS; HEATING-RATE; SCRAP TIRES; TG-FTIR; GASIFICATION; FATE; FUEL; OPTIMIZATION; COMBUSTION; CONVERSION;
D O I
10.1016/j.jaap.2020.104987
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The transformation of N/S/Cl during pyrolysis of waste tire were investigated by Thermogravimetry-Mass Spectrum (TG-MS) and flow tube furnace reactor. The pyrolysis of waste tire included four stages, i.e., dehydration below 200 degrees C, decomposition of tire additives at 200-300 degrees C, degradation of natural rubber at 300-420 square, and cracking of synthetic rubber at 420-500 degrees C. The activation energy E alpha were calculated according to the Coats-Redfern integral method, ca. 154.72-158.23 and 200.46-231.58 kJ/mol for degradation of natural rubber and synthetic rubber, respectively. Most of nitrogen (60.32-67.78 wt.%), sulfur (56.73-62.38 wt.%), and chlorine (58.60-64.92 wt.%) were remained in the pyrolytic char. For the pyrolytic oil composition, expect for alkanes, alkenes, aromatic hydrocarbons, and oxygenates, the S-containing disulfide and sulfurous acid ester, N-containing quinoline and pyrimidine diamine, and Cl-containing silane, dichlorododecylmethylwere detected. The nitrogen, sulfur, and chlorine in pyrolytic gas had diverse types. The N-containing pollutants mainly derived from inorganic ammonium and heterocyclic-N. NH3 had a wide releasing temperature range, while NO, HCN, and HNCO were mainly generated at 300-600 degrees C. The C-S and -SH radicals mainly contributed to S containing pollutants, i.e., H2S, COS, CS2, SO2, CH3SH, and C6H5SH. The Cl-containing pollutants exhibited dominant release within the temperature range of 300-600 degrees C. Overall, higher heating rate promoted gas emissions, especially for NO, HCN, CH3SH, and HCl. This article provides basic knowledge on hazardous N/S/Cl transformation in solid char, liquid oil, and gas during pyrolysis of waste tire that will provide valuable information for future control technologies of pollutants emission.
引用
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页数:12
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