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Sulfur fate during bituminous coal combustion in an oxy-fired circulating fluidized bed combustor
Lunbo Duan,Wu Zhou,Haixin Li,Xiaoping Chen,Changsui Zhao 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.9
To clarify the sulfur transformation behavior during oxy-fired circulating fluidized bed (CFB) combustion,experiments on SO_2 emission characteristics were carried out in a 50 kWth CFB combustor. Results show that SO_2 emission is quite dependent on the bed temperature in different atmospheres without limestone injection. With Ca/S=2.5, SO_2 emission in 21%O_2/79%CO_2 atmosphere is smaller than that in air atmosphere, but SO_2 emission decreases with the increase of O_2 concentration. The calcium forms in the ash prove the combination of calcination/carbonation and direct sulfation mechanism of limestone under oxy-combustion conditions. And the desulfurization efficiency of limestone (as deducting the self-retention efficiency from the total sulfur removal efficiency) increases from 40% to 52% as the O_2 concentration increases from 21% to 40%.
Shuguo Qu,Chenchen Zhang,Minhui Li,Yan Zhang,Lunbo Chen,Yushuai Yang,Bo Kang,Yiwei Wang,Jihai Duan,Weiwen Wang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12
Making inexpensive proton exchange membrane with high proton conductivity for the proton exchange membrane fuel cell (PEMFC) is still a challenging problem. Graphene oxide (GO) nanoparticles grafted with (3-aminopropyl) triethoxy silane (APTES) were prepared and then incorporated into sulfonated poly(ether ether ketone) (SPEEK) matrix by solution casting to make the composite proton exchange membrane. The obtained nanoparticles and composite membranes were characterized by XRD, FT-IR, Raman, TGA, SEM, and UTM. GO treated with the silane coupling agent improved the dispersion stability and compatibility of GO in SPEEK, which decreased the agglomeration of GO nanoparticles in the SPEEK membrane. The prepared nanocomposite membranes exhibited better water retention properties and proton conductivity. The proton conductivity of the SPEEK membrane with 2wt% amine functionalized GO (AGO) reached 11.32mS/cm at 120oC, which was 2.45-times higher than that of the pristine SPEEK membrane. The reason was that AGO nanoparticles disperse uniformly in the SPEEK membranes, which provides new channels for proton transfer. The potential application of this composite membrane in the PEMFC was indicated.