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Title: Catalytic gasification of a Powder River Basin coal with CO 2 and H 2 O mixtures

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1397972
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Fuel Processing Technology
Additional Journal Information:
Journal Volume: 161; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 22:43:02; Journal ID: ISSN 0378-3820
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Zhang, Fan, Fan, Maohong, Huang, Xin, Argyle, Morris D., Zhang, Bo, Towler, Brian, and Zhang, Yulong. Catalytic gasification of a Powder River Basin coal with CO 2 and H 2 O mixtures. Netherlands: N. p., 2017. Web. doi:10.1016/j.fuproc.2017.03.010.
Zhang, Fan, Fan, Maohong, Huang, Xin, Argyle, Morris D., Zhang, Bo, Towler, Brian, & Zhang, Yulong. Catalytic gasification of a Powder River Basin coal with CO 2 and H 2 O mixtures. Netherlands. doi:10.1016/j.fuproc.2017.03.010.
Zhang, Fan, Fan, Maohong, Huang, Xin, Argyle, Morris D., Zhang, Bo, Towler, Brian, and Zhang, Yulong. 2017. "Catalytic gasification of a Powder River Basin coal with CO 2 and H 2 O mixtures". Netherlands. doi:10.1016/j.fuproc.2017.03.010.
@article{osti_1397972,
title = {Catalytic gasification of a Powder River Basin coal with CO 2 and H 2 O mixtures},
author = {Zhang, Fan and Fan, Maohong and Huang, Xin and Argyle, Morris D. and Zhang, Bo and Towler, Brian and Zhang, Yulong},
abstractNote = {},
doi = {10.1016/j.fuproc.2017.03.010},
journal = {Fuel Processing Technology},
number = C,
volume = 161,
place = {Netherlands},
year = 2017,
month = 6
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 27, 2018
Publisher's Accepted Manuscript

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  • A study was conducted to investigate the effect of selective catalytic reduction (SCR) catalyst on mercury (Hg) speciation in bituminous and subbituminous coal combustion flue gases. Three different Illinois Basin bituminous coals (from high to low sulfur (S) and chlorine (Cl)) and one Powder River Basin (PRB) subbituminous coal with very low S and very low Cl were tested in a pilot-scale combustor equipped with an SCR reactor for controlling nitrogen oxides (NO{sub x}) emissions. The SCR catalyst induced high oxidation of elemental Hg (Hg{sup 0}), decreasing the percentage of Hg{sup 0} at the outlet of the SCR to valuesmore » <12% for the three Illinois coal tests. The PRB coal test indicated a low oxidation of Hg{sup 0} by the SCR catalyst, with the percentage of Hg{sup 0} decreasing from {approximately} 96% at the inlet of the reactor to {approximately} 80% at the outlet. The low Cl content of the PRB coal and corresponding low level of available flue gas Cl species were believed to be responsible for low SCR Hg oxidation for this coal type. The test results indicated a strong effect of coal type on the extent of Hg oxidation. 16 refs., 4 figs., 3 tabs.« less
  • A bench-scale reactor consisting of a natural gas burner and an electrically heated reactor housing a selective catalytic reduction (SCR) catalyst was constructed for studying elemental mercury (Hg{sup 0}) oxidation under SCR conditions. A low sulfur Powder River Basin (PRB) subbituminous coal combustion fly ash was injected into the entrained-flow reactor along with sulfur dioxide (SO{sub 2}), nitrogen oxides (NOx), hydrogen chloride (HCl), and trace Hg{sup 0}. Concentrations of Hg{sup 0} and total mercury (Hg) upstream and downstream of the SCR catalyst were measured using a Hg monitor. The effects of HCl concentration, SCR operating temperature, catalyst space velocity, andmore » feed rate of PRB fly ash on Hg0 oxidation were evaluated. It was observed that HCl provides the source of chlorine for Hg{sup 0} oxidation under simulated PRB coal-fired SCR conditions. The decrease in Hg mass balance closure across the catalyst with decreasing HCl concentration suggests that transient Hg capture on the SCR catalyst occurred during the short test exposure periods and that the outlet speciation observed may not be representative of steady-state operation at longer exposure times. Increasing the space velocity and operating temperature of the SCR led to less Hg{sup 0} oxidized. Introduction of PRB coal fly ash resulted in slightly decreased outlet oxidized mercury (Hg{sup 2+}) as a percentage of total inlet Hg and correspondingly resulted in an incremental increase in Hg capture. The injection of ammonia (NH{sub 3}) for NOx reduction by SCR was found to have a strong effect to decrease Hg oxidation. The observations suggest that Hg{sup 0} oxidation may occur near the exit region of commercial SCR reactors. Passage of flue gas through SCR systems without NH{sub 3} injection, such as during the low-ozone season, may also impact Hg speciation and capture in the flue gas. 18 refs., 7 figs., 3 tabs.« less
  • An investigation of speciated mercury transformation with the addition of hydrogen bromide (HBr) at elevated temperatures was conducted in a slipstream reactor with real flue gas atmospheres. Test results indicated that adding HBr into the flue gas at several parts per million strongly impacted the mercury oxidation and adsorption, which were dependent upon temperature ranges. Higher temperatures (in the range of 300-350 C) promoted mercury oxidation by HBr addition but did not promote mercury adsorption. Lower temperatures (in a range of 150-200 C) enhanced mercury adsorption on the fly ash by adding HBr. Test results also verified effects of fluemore » gas atmospheres on the mercury oxidation by the addition of HBr, which included concentrations of chlorine and sulfur in the flue gas. Chlorine species seemed to be involved in the competition with bromine species in the mercury oxidation process. With the addition of HBr at 3 ppm at a temperature of about 330 C, the additional mercury oxidation could be reached by about 55% in a flue gas atmosphere by burning PRB coal in the flue gas and by about 20% in a flue gas by burning bituminous coal. These are both greater than the maximum gaseous HgBr2 percentage in the flue gas (35% for PRB coal and 5% for bituminous coal) by thermodynamic equilibrium analysis predictions under the same conditions. This disagreement may indicate a greater complexity of mercury oxidation mechanisms by the addition of HBr. It is possible that bromine species promote activated chlorine species generation in the flue gas, where the kinetics of elemental mercury oxidation were enhanced. However, SO{sub 2} in the flue gas may involve the consumption of the available activated chlorine species. Thus, the higher mercury oxidation rate by adding bromine under the flue gas by burning PRB coal may be associated with its lower SO{sub 2} concentration in the flue gas. 39 refs., 8 figs., 4 tabs.« less