School of Chemical Engineering and Technology Xinjiang University,State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,Xinjiang Key Laboratory of Coal Clean Conversion & Chemical Engineering
National Energy Technology &Equipment Laboratory of Coal Utilization and Emission Control,CCTEG China Coal Research Institute
State KeyLaboratory of Fine Chemicals,Institute of Coal Chemical Engineering,School of Chemical Engineering,Dalian University of Technology
Petro China Karamay Petrochemical Co.,Ltd.

新疆地区煤炭储量丰富,低阶煤占比较高。其中,哈密地区的煤炭普遍具有挥发分高的特点,适宜通过热解提取其中的油气组分。然而热解焦油存在重质组分含量高、黏度大、易带尘等问题,因此如何降低焦油中重质组分含量,提升焦油品质是实现其高值化利用的关键。塑料与煤具有相似的热解温区,且塑料的H/C原子比远高于煤,其在热解过程中产生的富氢组分可促进煤的一次热解反应或抑制煤热解过程中的交联现象。煤与塑料共热解过程中,挥发物之间存在相互作用,其机制与二者接触方式密切相关。通过TG、TG-MS和TG-FTIR-GC/MS探究聚丙烯(PP)和淖毛湖煤(NMH)共热解过程中相互作用。TG-MS结果显示二者快速分解阶段主要热解温度区间基本重合,PP热解过程生成·CH3。PP置于NMH上方时,二者质量比显著影响NMH热失重行为和挥发物释出规律,当NMH、PPexp质量比为8∶2时,正协同效应最明显。TG-FTIR-GC/MS结果显示,8NMH-2PPexp热解过程中,PP热解自由基促进NMH化学键断裂,形成的相互作用改变氧的释放形式,CO和H2O增加,CO2减少。烯烃及醇类物质相对含量分别比理论计算值高30.58%和16.18%,CO2和烷烃类分别低8.89%和14.43%。Flynne-Walle-Ozawa计算结果表明,共热解平均活化能比理论计算值低6.8kJ/mol,与PP促进NMH挥发物的释放印证。

The coal reserves in Xinjiang are rich,with a high proportion of low-rank coal. Among them, the coal in Hami region is generally characterized by high volatile content, which is suitable for the tar and gas by pyrolysis. However, there are many problems with pyrolysis tar, such as high content of heavy components, high viscosity and easy to carry dust. Therefore, how to reduce the content of heavy components in tar and improve the quality of tar is the key to realize high value utilization. Plastics and coal have similar pyrolysis intervals but the H/ C atoms of plastics is much higher than that of coal. The hydrogen-rich components produced during pyrolysis could promote the primary pyrolysis reaction of coal or inhibit the cross - linking phenomenon during coal pyrolysis. Volatiles interaction existsduring co-pyrolysis of coal and plastics, which is closely related to the contact mode of raw materials. The co-pyrolysis of polypropylene(PP) and Naomaohu coal (NMH) were investigated by combing TG, TG-MS and TG-FTIR-GC/ MS. TG-MS results show main pyrolysis temperature range of the two rapid decomposition stages basically coincided, and the formation of ·CH3 during PP pyrolysis. When PPlayer is placed on top of NMH layer with different mass ratios, the weight loss characteristics and the volatiles evolution of NMH exhibit anobvious difference. The strongest synergy appears on the mass ratio of 8 ∶ 2 for NMH and PP during the co-pyrolysis process. TG-FTIR-GC/ MS experimental results reveal that the synergistic effect of NMH and PP changes the release form of oxygen because the radicals fromPP pyrolysis facilitates the cleavage of covalent bonds of NMH, leading to the increase of CO and H2 O yields but the decrease of CO2yield. Compared with the theoretical calculated values, the relative content of alkene and alcohols increases by 30.58% and 16.18%,while those for CO2 and alkanes decreases by 8.89% and 14.43%, respectively. The activation energy of co-pyrolysis calculated by Flynne-Walle-Ozawa is 6.8 kJ/ mol lower than the theoretical value, confirming that PP is conducive to the release of NMH volatiles.

新疆维吾尔自治区杰出人才资助项目(2020Q001);上海合作组织科技伙伴计划及国际科技合作计划资助项目(2020E01018);国家自然科学基金新疆联合基金青年培育资助项目(U1903130)

王雪婷,钟梅,代正华,等.低阶煤与聚丙烯共热解协同效应分析[J].洁净煤技术,2024,30(4):187-195.

WANG Xueting,ZHONG Mei,DAI Zhenghua,et al.Synergetic effect during co-pyrolysis of low-rank coal and polypropylene[J].Clean Coal Technology,2024,30(4):187-195.