Coal gasification fine slag vacuum dewatering by ceramic membrane and numerical simulation

被引：0
|
作者：
Guo F. [1 ,2 ]
Wu J. [1 ,2 ]
Zhang H. [1 ,2 ]
Guo Y. [1 ]
Liu H. [1 ]
Zhang Y. [2 ]
机构：
[1] School of Chemical Engineering and Technology, China University of Mining and Technology, Jiangsu, Xuzhou
[2] Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Jiangsu, Xuzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 08期
关键词：
ceramic membrane; coal gasification fine slag; dewatering characteristics; filtration; numerical simulation;
D O I：
10.16085/j.issn.1000-6613.2021-2152
中图分类号：
学科分类号：
摘要：
Gasification fine slag (GFS) is the waste of coal gasification process and its efficient dewatering is a prerequisite for its resource utilization and reduction disposal. In this paper, the dewatering experiment and numerical simulation were carried out by using ceramic membrane vacuum filtration system. The gasification fine slag slurry concentration and subaqueous adsorption time affected the filter cake forming thickness, and the increase of filter cake thickness caused increasing water transport path, which extended the effective dewatering time. The dewatering rate value of filter cake dewatering process showed a non-linear decrease trend and there was a limit value of 40% for dewatering process, which was related to the physicochemical properties. When the vacuum degree was less than 0.08MPa, the “channel water” of GFS filter cake can be effectively removed at about 24s. In the Fluent numerical simulation, Euler model was selected to determine the resistance coefficient of ceramic membrane filter plate and GFS filter cake. The error between experimental value and simulation result of dewatering process was less than 5%, which confirmed the reliability of the model. The evolution laws of vacuum pressure field and water content distribution cloud diagram were analyzed during the GFS dewatering process. The results indicated that dewatering efficiency of fine gasification slag can be improved by increasing dewatering vacuum degree, decreasing filter cake thickness and increasing “channel water” ratio and GFS particles equivalent diameter. Moreover, the filtrate obtained from ceramic membrane vacuum dewatering system had high cleanliness and some indexes met the standard of industrial water. The results had guiding significance for improving the dewatering efficiency and reducing energy consumption of GFS dewatering process, which was in line with the policy goal of “Carbon peak and Carbon neutral” in China. © 2022 Chemical Industry Press. All rights reserved.
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页码：4047 / 4056
页数：9
相关论文
共 21 条
  • [1] QU Jiangshan, ZHANG Jianbo, SUN Zhigang, Et al., Research progress on comprehensive utilization of coal gasification slag, Clean Coal Technology, 26, 1, pp. 184-193, (2020)
  • [2] XIE Heping, WU Lixin, ZHENG Dezhi, Prediction on the energy consumption and coal demand of China in 2025, Journal of China Coal Society, 44, 7, pp. 1949-1960, (2019)
  • [3] WANG Ji, KONG Lingxue, BAI Jin, Et al., Research progress on the effect of residual carbon in coal gasification slag on ash and slag flow property, Clean Coal Technology, 27, 1, pp. 181-192, (2021)
  • [4] LIU Yang, WU Xiuzhang, LIU Yongjian, Et al., Global heat integration and optimization of coal to natural gas process, Chemical Industry and Engineering Progress, 40, 7, pp. 3719-3727, (2021)
  • [5] GUO Fanhui, MIAO Zekai, GUO Zhenkun, Et al., Properties of flotation residual carbon from gasification fine slag, Fuel, 267, (2020)
  • [6] GUO Fanhui, ZHAO Xu, GUO Yang, Et al., Fractal analysis and pore structure of gasification fine slag and its flotation residual carbon, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 585, (2020)
  • [7] YUAN Ning, ZHAO Aijing, HU Zekai, Et al., Preparation and application of porous materials from coal gasification slag for wastewater treatment: a review, Chemosphere, 287, (2022)
  • [8] LYU Feiyong, CHU Mo, YI Haoran, Et al., Distribution characteristics of magnetic ash particles in gasification ash slag of different particle sizes, Chemical Industry Progress, 41, 5, pp. 2372-2378, (2022)
  • [9] GUO Fanhui, GUO Yang, ZHANG Yixin, Et al., Dewatering mechanism of gasification fine slag by coupled mechanical force fields and its potential guidance for efficient dewatering process, Fuel Processing Technology, 205, (2020)
  • [10] GUO Fanhui, LIU Hu, GUO Yang, Et al., Occurrence modes of water in gasification fine slag filter cake and drying behavior analysis—A case study, Journal of Environmental Chemical Engineering, 9, 1, (2021)
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