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    188宝金博页面版: 针状焦-Co-carbonization behavior of the blended heavy oil and low temperature coal tar for the preparation of needle coke

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    内容提示： Fuel 302 (2021) 121139Available online 4 June 20210016-2361/? 2021 Elsevier Ltd. All rights reserved.Full Length Article Co-carbonization behavior of the blended heavy oil and low temperature coal tar for the preparation of needle coke Zhichen Zhanga , 1 , Bin Lou a , * , 1 , Ning Zhao b , Enqiang Yu c , Zenghao Wang a , Hui Du d , Zhaojun Chend , Dong Liu a , * a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, People’s Republic of China b Shaanxi Coal and Che...

    文档格式：PDF | 页数：10 | 浏览次数：21 | 上传日期：2021-10-05 09:32:00 | 文档星级：
    Fuel 302 (2021) 121139Available online 4 June 20210016-2361/© 2021 Elsevier Ltd. All rights reserved.Full Length Article Co-carbonization behavior of the blended heavy oil and low temperature coal tar for the preparation of needle coke Zhichen Zhanga , 1 , Bin Lou a , * , 1 , Ning Zhao b , Enqiang Yu c , Zenghao Wang a , Hui Du d , Zhaojun Chend , Dong Liu a , * a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, People’s Republic of China b Shaanxi Coal and Chemical Industry Group Shenmu Tianyuan Chemical Industry Co., Ltd, People’s Republic of China c Guangdong DaGang Petroleum Technology Co., Ltd, People’s Republic of China d College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, People’s Republic of China A R T I C L E I N F O Keywords: Heavy oil Low temperature coal tar Needle coke Co-carbonization behavior A B S T R A C T Needle coke is mainly used in high-power electrode material for electric arc furnace, the economy of material cost and the quality of co-carbonized products are widely concerned. Low temperature coal tar (LCT) and heavy oil (HO) were used to prepare needle coke by liquid phase carbonization, and the co-carbonization behavior as well as structural evolution of blended materials were also studied. It was concluded that the derived needle coke pyrolyzed from the blended HO and LCT showed obvious structural separation interfaces between the anisotropic acicular structure and isotropic matrix. The abundant primary quinoline insolubles (QI) in LCT prevented the penetration of smaller molecules. The removal of primary QI in LCT improved the compatibility of HO and LCT- derived structure and eliminated the obvious structural separation interfaces. The furfural extraction signif i -cantly regulates the molecular composition distribution which is conductive to promote interactions within compositions and improve the order of structural evolution. The sample extracted at 60℃ after removing QI (LCTE60) contained 25.7 wt% of alkanes and naphthenes, and the total content of bicyclic aromatics, tricyclic aromatics and tetracyclic aromatics occupied 45.3 wt%. The derived needle coke prepared from blended HO and LCTE60 with the proportion of 50:50 obtained the needle domain content of 60 wt% and the optical texture index (OTI) of 71.66. This study provides theoretical basis for the co-carbonization of needle coke production. 1. Introduction Needle coke possesses low thermal expansion, high mechanical strength as well as good electrical and thermal conductivity and is widely used in the production of ultra-high power electrodes and high power electrodes [1–3]. Needle coke is classif i ed into petroleum-based needle coke and coal-based needle coke. The raw materials of petroleum-based needle coke are mainly FCC slurry, petroleum pitch and ethylene tar [4]. The processing of petroleum feedstocks is complicated, which usually requires removal of solid catalyst powder, catalytic hydrogenation and furfural extraction [5,6]. The high pre-treatment cost and low yield of petroleum feedstocks result in the limited application of high-quality carbon materials in high-tech fi elds [7,8]. Many research groups are working to fi nd simplif i ed processes or cheap raw materials to reduce production costs [9–14]. The coal feedstocks also have high aromaticity and the production costs are low, so that they are also widely used to prepare carbon materials. However, the toxicity and carcinogenicity of emissions during the pyrolysis of coal feedstocks is usually high, which can cause the environmental and worker health problems [15]. Therefore, the co-carbonization of coal pyrolysis product and heavy oil is adopted to reduce the cost and ensure the quality of the carbon structure, while taking into account the impact on the environment. In many literatures, raw materials were co-carbonized to modify the carbonaceous structure. [16–26]. Mora et al. [27] discussed the well- known result that primary quinoline-insolubles (QIs) in the coal feed-stock affected the coalescence of mesophase spheres. The primary QI acted like nucleating agent which promoted the growth of mesophase spheres and affected the development of mesophase. Perez, et al. [28] added coal-tar pitch into petroleum pitch to modify the character of * Corresponding author. E-mail addresses: louloulove@163.com (B. Lou), liudong@upc.edu.cn (D. Liu). 1 Co-f i rst authors. Contents lists available at ScienceDirect Fuel journal homepage: www.elsevier.com/locate/fuel https://doi.org/10.1016/j.fuel.2021.121139 Received 22 April 2021; Received in revised form 25 May 2021; Accepted 26 May 2021

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