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Volume 38 Issue 12
Apr.  2021
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2020  >  38(12): 97-102,91
DAI Liang, ZHAO Wei-fan, ZHANG Hong-wei, HAN Tao, ZHANG Kang. RESEARCH PROGRESS ON ADSORPTION OF HEAVY METALS BY SEWAGE SLUDGE-BASED BIOCHAR IN WATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 70-77. doi: 10.13205/j.hjgc.202012013
Citation: ZHU Hong-tang, SHEN Xian-kun, LI Run-hao, HU Xiu-de, SUN De-shuai, CHEN Zhao-jun. REMOVAL OF FINE PARTICLES FROM COAL COMBUSTION WITH CHEMICAL AGGLOMERATION AGENTS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 97-102,91. doi: 10.13205/j.hjgc.202012017
shu

REMOVAL OF FINE PARTICLES FROM COAL COMBUSTION WITH CHEMICAL AGGLOMERATION AGENTS

doi: 10.13205/j.hjgc.202012017

  • 1. College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China;

  • 2. State Key Laboratory of High-efficiency Utilization of Coal & Green Chemical Engineering, Ningxia University, Yinchuan 750021, China

  • Received Date: 2019-12-18
    Available Online: 2021-04-23
    Abstract
  • Fine particles from coal combustion have a serious impact on human health and atmospheric environment. Chemical agglomeration technology could help the agglomeration of fine particles to form large aggregation which were captured easily by conventional precipitator. The constituents of chemical agglomeration agents affected greatly the removal efficiency of fine particles. A multi-components chemical agglomeration agent including surfactant, polymer flocculant and inorganic salt was atomized and ejected into the agglomeration chamber to increase the agglomeration of fine particles. The experimental data showed that the two-component agglomeration agent containing inorganic salt and surfactant or flocculant could increase the removal of fine particles. The maximum efficiency in Tween-80 mixture was 44.1%. The increment of the concentration of agglomeration agents could benefit for the removal of particles, especially for positively charges surfactant or flocculant. However, high concentration of flocculant resulted in high viscosity of solution, consequently forming large spray droplet and decreasing the number of droplet, which could not favor the agglomeration process. For the surfactants, high concentration could result in their remains in emission due to the small molecule structure. The concentration of agglomeration agent should be controlled detailed. The removal efficiency of fine particles could be further improved as the inorganic salt, especially when ammonium chloride was added. And high concentration of slat favored this process. The optimum pH value at which the removal was maximum was in weak acid range. The adhesive force among particles increased by 3.5 times when three-component chemical agents were used to remove particles. Therefore, the mass of fine particles reduced by 45%~49%, and the median diameter increased from 3.5 μm to 7.5~8.6 μm.
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