Gunangxi University

Nanning, China

Gunangxi University

Nanning, China
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Nong G.Z.,Gunangxi University | Wang S.F.,Gunangxi University | Mu J.J.,Gunangxi University | Zhang X.L.,Gunangxi University
Asian Journal of Chemistry | Year: 2012

Black liquor gasification gas contains a small amount of dimethyl sulfide, which needs to be removed before the gasification gas combusting in the gas turbine in black liquor integrated gasification combined cycle (BLIGCC). A desulphurization method has been carried experimentaly in the conditions of high temperature and ZnO catalyst, where dimethyl sulfide and hydrogen reacted to produce methane and hydrogen sulfide, then the hydrogen sulfide was absorbed with alkali solution. The current investigation was carried out to find the kinetics of reaction between dimethyl sulfide and hydrogen in black liquor gasification gas with ZnO catalyst. The reaction was studied in a pipe reactor at various temperatures and concentrations of dimethyl sulfide and hydrogen. The reaction rate was evaluated by analyzing the consumption of dimethyl sulfide and then the rate law was established. The reaction has been found 0.963 and 1.098 order with respect to dimethyl sulfide and hydrogen, respectively and the activation energy was 31737.19 J mol with frequency factor 16747.32.

Nong G.,Gunangxi University | Huang L.,Gunangxi University | Mo H.,Gunangxi University | Wang S.,Gunangxi University
Energy | Year: 2013

Black liquor is a major by-product of pulp mills; it is one of the most important renewable energy resources, which can be used as a material to produce electrical power, hydrogen, methanol and dimethyl ether by the black liquor gasification technology. In this paper, experiments were carried out with an oxygen injected-gasifier with different oxygen mass ratios, and then the gas compositions were determined and thermal efficiencies were estimated. The results support the following findings: (a) The oxygen mass ratio affected the formations of the CO and H2, which formations decrease with increasing oxygen mass ratio. (b) The best thermal efficiency of (bagasse black liquor gasification) BBLG system is 0.816, which is close to that of the (dry black liquor gasification) DBLG systems and the (catalytic hydrothermal gasification) CHG systems, and is 25.6% higher than that of the common (recovery boilers) RB. © 2012 Elsevier Ltd.

Pang Z.Q.,Gunangxi University | Pang Z.Q.,Shandong Institute of Light Industry | Wang X.Q.,Shandong Institute of Light Industry | Chen J.C.,Shandong Institute of Light Industry
Advanced Materials Research | Year: 2011

The selectivity of delignification is disappointing in the conventional intensified alkali extraction by oxygen and H2O2. To improve the properties of the conventional intensified alkali extraction, the gradient intensified alkali extraction by oxygen-containing bleaching agents was presented, and effects of treatment conditions on properties of gradient intensified alkali extraction of kraft pulp by oxygen and/or H2O 2 were investigated. In DEPD bleaching sequence, the optimal dosage of H2O2 in EP stage is 1.5% with higher brightness and lower loss in viscosity of bleached pulp. The addition time of H2O2 is better after 20 min of alkali extraction in DE/PD sequence to facilitate bleaching function of H2O 2. In DP/ED sequence, the brightness is highest when alkali extraction carried through after 20 min of H2O2 bleaching. In EO stage, the optimal dosage of NaOH is 5.0% considering delignification and bleaching efficiency. As to alkali extraction intensified by oxygen and H2O2, the optimum dosage of H 2O2 is 1.0%. Gadient intensified alkali extraction with oxygen and/or H2O2 was adopted for further bleaching and delignification, which can increase the brightness and selectivity of delignification by subtly adjusting the parameters. © (2011) Trans Tech Publications.

Nong G.,Gunangxi University | Li M.,Gunangxi University | Chen Y.,Gunangxi University | Zhou Z.,Gunangxi University | Wang S.,Gunangxi University
Energy | Year: 2015

Hydrogen is a kind of green fuel, and is considered as the substitute oil fuel for future. Although many of literature of photocatalyst water splitting have been presented, little of the literature focused on their energy conversions. Therefore, investigation of their energy conversions is carried out by simulation in this paper. Large energy is consumed in the plant for 1000m3 hydrogen fuels. In where, the efficiencies of hydrogen fuel generation are 29.9%, 15.6%, 10.5% and 7.95%, corresponding to the cases of one, two, three or four photons are needed to excite and generate one free electron by artificial light. While nature sunlight is utilized, the efficiencies are 48.4%, 25.2%, 17.8% and 13.6% corresponding to the four cases respectively; and the ratio between the combustion heat of generated hydrogen fuels and the total electric energy consumption is 319.0-333.0 %. © 2015 Elsevier Ltd.

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