Oxyfuel derived CO2 compression experiments with NO , SO  and mercury removal—Experiments involving compression of slip-streams from the Callide Oxyfuel Project (COP)

Stanger, Rohan; Ting, Tim; Spero, Chris; Wall, Terry

doi:10.1016/j.ijggc.2015.06.022

Cited by 25 publications

(13 citation statements)

References 16 publications

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“…Oxy-fuel demonstration projects have proposed different solutions to clean mercury prior to CO 2 liquefaction, usually combined with the removal con N-and S-compounds. The sour compression technology implies dissolving mercury in the nitric acid formed as condensate and hence is directly linked to the capture of NOx and SOx [8]. On the other hand, the inclusion of an activated carbon bed before or in the compression system was one of the first methods used: Schwarze Pumpe pilot plant worked with an adsorbing tower of S-doped activated carbon positioned before the CO 2 processing unit; but there is a risk of a thermal explosion within the bed at high pressure.…”

Section: Submitted Accepted and Published By: Fuel 207 (2017) 821_829mentioning

confidence: 99%

Mercury capture by a structured Au/C regenerable sorbent under oxycoal combustion representative and real conditions

Gómez-Giménez

Izquierdo

Loscertales

et al. 2017

Fuel

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The environmental implications of mercury do not correspond only to the emissions to the atmosphere; the quality of the captured CO 2 to be transported and sequestered has been subject of research, concerning trace quantities of heavy metals participating in mineralization and precipitation reactions in sequestration conditions. For oxycoal combustion, mercury is not an environmental issue alone but also an operational issue, particularly about where mercury could accumulate within the CO 2 processing unit. Therefore, Hg removal is necessary to prevent its attack on the aluminium heat exchangers. In this work, a regenerable sorbent based on carbon supported Au nanoparticles (0.1%wt) has been used for Hg capture under oxycoal combustion atmosphere. The influence of the presence of O 2 , NO, SO 2 and HCl in a gas containing Hg and CO 2 on the sorbent as well as on the Hg oxidation (Au can act as an oxidation catalyst) has been evaluated under a simulated flue gas. The presence of either NO or HCl in the simulated flue gas led to mercury oxidation, with oxidized mercury not evolving in the gas, indicating that it is retained on the sorbent; the oxidized mercury is well stabilized on Au surfaces of the sorbent and favours the Hg-Au amalgam formation. This sorbent has been also evaluated in 3 kWth oxycoal bubling fluidized bed combustor. A lignite with high sulphur content was burned in presence of limestone. Despite high SO 2 concentration that reached the Au/C sorbent, high capture efficiency was achieved and breakthrough occurred after 3.5 h and 10% breakthrough is not reached during the experiments. Bearing in mind that regeneration time can be adjusted near 1 h, two swing sorbent beds could be used to control mercury emissions under oxycoal combustion conditions.

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Section: Submitted Accepted and Published By: Fuel 207 (2017) 821_829mentioning

confidence: 99%

Mercury capture by a structured Au/C regenerable sorbent under oxycoal combustion representative and real conditions

Gómez-Giménez

Izquierdo

Loscertales

et al. 2017

Fuel

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“…However, recent studies [38,39] showed that the removal of Hg through during compression has the potential to reduce the overall cost of oxy-fuel and represents a significant advantage that oxy-fuel has over other CCS technologies, such as postcombustion capture, which require removal of impurities prior to entering the CO 2 compressor unit. Thus, the oxy-combustion in circulating fluidized beds (CFBs) could capture most of the mercury; remaining mercury could be readily removed from the flue gas during compression through a gas phase, kinetically controlled, reaction with NO 2 /N 2 O 4 [38,39].…”

Section: Effect Of Temperature and Coal Characteristicsmentioning

confidence: 99%

Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: Influence of coal characteristics and O2 concentration

Izquierdo

Loscertales

Diego

et al. 2017

Fuel Processing Technology

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In this work, the fate of mercury in a bubbling fluidized bed combustor working under oxy-combustion conditions has been studied and compared with air combustion. The influence of burning three different rank coals, with sulphur content ranging from 0.65 % to 5.17 %, on Hg partitioning has been studied. The presence of limestone as sorbent for SO 2 capture as well as the concentration of O 2 at the entrance of the combustor were also evaluated. Coal rank does not have a direct influence on coal partitioning. However, sulphur content of the coal is an important parameter to describe not only the high percentage of particle-bound mercury, up to 87 %, in presence of limestone but also the prevalence of Hg(0) as the main species in the gas phase when burning the lignite. The O 2 /CO 2 ratio has little effect on Hg partitioning in experiments carried out in presence of limestone at 925 ºC (the optimum temperature for sorbent sulphating under oxy-combustion conditions) and little differences are found with air combustion at 850 ºC (the optimum temperature for sorbent sulphating under air combustion conditions). Percentage of particle-bound mercury shows a maximum at 925 ºC independently of the coal studied, which it is related with the maximum sulphur retention for each coal at this temperature.

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“…Based on the above factors, the room temperature of 30°C is more appropriate. Therefore, the choice of pressure during pressurization is critical [8,9].…”

Section: Optimization Analysis Of Pressure Denitrification Processmentioning

confidence: 99%

Balance Calculation and Optimization of Denitrification Process Simulation of Oxy-fuel Combustion Flue Gas

Huang¹

2017

Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)

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Abstract. Oxy-fuel combustion is an important development direction of combustion technology, and the key technology to reduce the cost of flue gas purification is the reduction of denitration cost. Based on the experiments and simulation process with Aspen Plus of pressure denitrification process, the reaction time and equilibrium concentration were analyzed when the denitrification reaction was balanced. Finally, the denitrification process was optimized according to the simulation results. The results showed that the equilibrium concentration and time of the denitrification process decreased with the increase of pressure, initial oxygen content and the decrease of temperature. The content of NO in flue gas had little influence on equilibrium concentration and time. After analysis and calculation, it is considered that 30°C and 26bar is more suitable for denitrification process of the pressurized flue gas.

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Oxyfuel derived CO2 compression experiments with NO , SO and mercury removal—Experiments involving compression of slip-streams from the Callide Oxyfuel Project (COP)

Cited by 25 publications

References 16 publications

Mercury capture by a structured Au/C regenerable sorbent under oxycoal combustion representative and real conditions

Mercury capture by a structured Au/C regenerable sorbent under oxycoal combustion representative and real conditions

Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: Influence of coal characteristics and O2 concentration

Balance Calculation and Optimization of Denitrification Process Simulation of Oxy-fuel Combustion Flue Gas

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