ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION ›› 2020, Vol. 36 ›› Issue (6): 1294-1305.doi: 10.3969/j.issn.1001-8719.2020.06.020

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Experimental and Numerical Research on Chemical Looping Gasification of Coal Char in a Pressured Fluidized Bed Reactor

GUO Xintong, CHANG Guozhang, TAN Xiaoli, HU Xiude, GUO Qingjie   

  1.  School of Chemistry and Chemical Engineering, State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
  • Received:2020-04-20 Revised:2020-08-13 Online:2020-11-25 Published:2020-12-02
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Combined CPFD simulations and experiments were used to study the gasification of Erdos bituminous coal char with Fe2O3/Al2O3 under the pressure of 0.1-0.5 MPa. The results showed that the particle volume fraction was the key factor affecting the coal gasification rate and the syngas quality under given pressures. When particle volume fraction ranged from 1.0% to 2.8%, the gasification rate of coal char increased by 2.7 times and the syngas molar fraction increased from 72% to 78% with the pressure of 0.1-0.3 MPa. The composition of syngas was not obviously changed by the variations of pressure and particle fluidization during water-gas shift reaction. The XRD characterization explored that the distribution of each reduction state of Fe-base oxygen carrier (OC) was consistent with the simulation results. At the pressure of 0.3 MPa, the increase of reduction rate of OC was decelerated and the total oxygen release increased by 50.18%. With the pressure reaching 0.5 MPa, the reduction rate was significantly promoted, but the total oxygen release was increased by only 3.92%.

Key words: chemical-looping, coal char gasification, pressure, numerical simulation, iron-based oxygen carrier

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