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Experiment on high temperature preheating and decarbonization process ofcoal gasification slag and cement properties of solid phase products

2023 No. 07
498
232
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Authors:
WANG Xuebin
YU Wei
CHEN Yongqiang
SHI Zhaochen
SHANG Jingpeng
WANG Jianjun
ZHANG Hanlin
Unit:
School of Energy and Power Engineering,Xi′an Jiaotong University
Zhaoyuan Huichao New Energy Technology Co.,Ltd.
Besino Environment Ltd.
Abstract:

Gasification slag is the solid waste produced in the process of coal gasification. At present, it is mainly treated by landfill. It notonly occupies a large amount of land, pollutes soil and water, but also causes energy waste. The gasification slag has a certain carbon con⁃tent, but the volatile content is very low and the water content of the receiving base is very high, which leads to the difficulty of energy uti⁃lization of the gasification slag. High temperature preheating decarbonization process is one of the effective technical approaches to realizethe resource disposal of ultra-low grade coal-based solid waste developed in recent years. This process can realize the self-stable combus⁃tion and burnout process of solid waste with near zero volatile matter and ultra-low calorific value, such as gasification slag and ashsludge mixture. After the gasification slag with the proportion of dry base fixed carbon of 13.1%-16.2% is treated by the integrated equip⁃ment of 100 000 tons/ year high temperature preheating and decarbonization in the single line of Xinjiang Ganquanpu Industrial Park, thevolatilization is basically removed, and the carbon content of exported ash residue is lower than 3%. The stable ignition and efficient burn⁃ing of input materials can be achieved without adding auxiliary fuel. The flue gas at the outlet of stable operation is converted to 9%O2 concentration, and the NOx emission is in the range of 64.5-66.9 mg/ m3. The gasification slag and gasification slag sludge mixture af⁃ter decarburization of the industrial demonstration production line are ground to replace 30% cement for mortar preparation, and thestrength activity index reaches 80% and 91% respectively, meeting the requirements of the strength activity index of fly ash for mortarand concrete mixing and fly ash for cement active mixing materials.

Keywords:
coal gasification slag
ultra low grade
preheating decarbonization
cement mortar
activity index
Citation format:
王学斌(1984—),男,山东昌邑人,教授,博士生导师,博士。E-mail:wxb005@mail.xjtu.edu.cn
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Citation format:
WANG Xuebin,YU Wei,CHEN Yongqiang,et al.Experiment on high temperature preheating and decarbonization process of coal gasification slag and cement properties of solid phase products[J].Clean Coal Technology,2023,29(7):78-86.

About Journal

  • Executive director

    China Coal Science and Industry Group Co., Ltd

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    Coal Science Research Institute Co., Ltd
    Coal Industry Clean Coal Engineering
    Technology Research Center

  • Editor in Chief

    XIE Qiang

  • Vice Editor-in-Chief

    YU Chang
    SHI Yixiang
    ZHAO Yongchun
    DUAN Linbo
    CAO Jingpei
    ZENG Jie

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