Flue gas effects on a carbon-based mercury sorbent

Miller, Stanley J.; Dunham, Grant E.; Olson, Edwin S.; Brown, Thomas

doi:10.1016/s0378-3820(99)00103-4

Cited by 129 publications

(98 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Sorbents, such as activated carbons, are considered to be effective sorbents for Hg control in flue gases from coal combustion [10][11][12][13]. However, economic alternatives need to be developed.…”

Section: Introductionmentioning

confidence: 99%

Speciation of mercury in fly ashes by temperature programmed decomposition

López-Antón

Perry

Abad-Valle

et al. 2011

Fuel Processing Technology

View full text Add to dashboard Cite

Mercury (Hg) is a toxic trace element which is emitted mostly in gas phase during coal combustion, although some Hg compounds may be retained in the fly ashes depending on the characteristics of the ashes and process conditions. To improve the retention of Hg in the fly ashes a good knowledge of the capture mechanism and Hg species present in the fly ashes is essential. The temperature programmed decomposition technique was chosen

show abstract

Section: Introductionmentioning

confidence: 99%

Speciation of mercury in fly ashes by temperature programmed decomposition

López-Antón

Perry

Abad-Valle

et al. 2011

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…At a temperature of 100-140 o C, using a FGD activated carbon and a flue gas composed of nitrogen, HgCl 2 and 1000 ppm SO 2 , they concluded that SO 2 reacted with the activated carbon and created sulfur active sites that captured elemental mercury through the formation of solid-phase, S-Hg bonds. Miller et al (2000) observed an initial mercury capture of 50%, which decreased to only 10% capture after 1 hour, with no oxidation of elemental mercury in the presence of 1600 ppm SO 2 . The flue gas composition was 6 % O 2 , 12 % CO 2 , 8% H 2 O, balance N 2 .…”

Section: Subtask 51 -Review/summary Of Existing Oxidation and Adsorpmentioning

confidence: 99%

“…Using a flue gas composition that was 6 % O 2 , 12 % CO 2 , 8% H 2 O, balance N 2 and a lignite activated carbon at 107 o C, Miller et al (2000) observed nearly 100% mercury capture in the presence of 50 ppm HCl. A similar effect of HCl with FGD sorbent was also observed by Carey et al (1997), who concluded that despite the lower gas-phase concentration, HCl had a more pronounced enhancement effect on elemental mercury capture than other species present in the flue gas such as SO 2 , suggesting that the Cl sites are more active than the S sites.…”

Section: Subtask 51 -Review/summary Of Existing Oxidation and Adsorpmentioning

confidence: 99%

“…Other sources of experimental data (Miller et al 2000) were used with the objective of finding the model constants for mercury and some of the other flue-gas species (HCl, SO 2 , and NO 2 ). Miller et al (2000) used a quartz filter loaded with 150.5 mg of a carbon-based sorbent and exposed it to a simulated flue gas. The temperature was kept at 225 o F (107 o C), and a Semtech 2000 mercury analyzer was used to continuously measure the elemental mercury at the outlet.…”

Section: mentioning

confidence: 99%

See 1 more Smart Citation

Clean Coal Program Research Activities

Baxter¹,

Eddings²,

Fletcher³

et al. 2009

View full text Add to dashboard Cite

Although remarkable progress has been made in developing technologies for the clean and efficient utilization of coal, the biggest challenge in the utilization of coal is still the protection of the environment. Specifically, electric utilities face increasingly stringent restriction on the emissions of NO x and SO x , new mercury emission standards, and mounting pressure for the mitigation of CO 2 emissions, an environmental challenge that is greater than any they have previously faced. The Utah Clean Coal Program addressed issues related to innovations for existing power plants including retrofit technologies for carbon capture and sequestration (CCS) or green field plants with CCS.The Program focused on the following areas: simulation, mercury control, oxycoal combustion, gasification, sequestration, chemical looping combustion, materials investigations and student research experiences. The goal of this program was to begin to integrate the experimental and simulation activities and to partner with NETL researchers to integrate the Program's results with those at NETL, using simulation as the vehicle for integration and innovation. The investigators also committed to training students in coal utilization technology tuned to the environmental constraints that we face in the future; to this end the Program supported approximately 12 graduate students toward the completion of their graduate degree in addition to numerous undergraduate students. With the increased importance of coal for energy independence, training of graduate and undergraduate students in the development of new technologies is critical.ii

show abstract

“…However, the experimental results may be influenced by the flue gas constituents, which often have a greater effect on the surface reactions than the properties of the solid sorbents (Pavlish et al, 2003). In the absence of acid gases, Miller et al (2000) showed that a lignitebased activated carbon accounted for only 10-20% mercury capture of Hg 0 . When the sorbent was exposed to SO 2 , the capture improved slightly and when HCl, NO, or NO 2 were added, the mercury captured amounted to 90-100%.…”

Section: Influence Of the Gas Atmospherementioning

confidence: 99%

Evaluation of the Variables that Influence Mercury Capture in Solid Sorbents

Antón¹,

Valle²,

Somoano³

et al. 2009

CCGP

View full text Add to dashboard Cite

A B S T R A C TNewly obtained results on mercury retention in fly ashes and activated carbons during coal combustion are compared with previous findings. The influence of different variables on mercury capture, including the composition and nature of the sorbents, the composition of the flue gas and the mercury species in gas phase is investigated.Coal-fired utility boilers are currently the largest single-known source of mercury emissions. According to the USEPA's Information Collection Request (ICR), on average, only 40% of the mercury entering a coal-fired power plant is captured, while 60% is emitted into the atmosphere. Several solid materials, including activated carbons, are considered to be effective sorbents for Hg control in flue gases from coal combustion. However, more economical alternatives to retain mercury such as the optimization of conditions for improving mercury capture in fly ashes in the installation also need to be studied.In this work, the mercury retention capacity of different fly ashes was compared with retention by commercial activated carbons in different experimental conditions. As might be expected, the results obtained indicate that the quantity of mercury captured depends on the characteristics of the fly ashes and on the mode of occurrence of mercury in gas phase. The retention of elemental mercury in the fly ashes, unlike activate carbons, was greatly influenced by the gas composition. Although the efficiency of the mercury retention was higher in activated carbons than in fly ashes, some activated carbon showed a lower retention capacity for elemental mercury than some fly ashes in the simulated flue gas.

show abstract

Flue gas effects on a carbon-based mercury sorbent

Cited by 129 publications

References 3 publications

Speciation of mercury in fly ashes by temperature programmed decomposition

Speciation of mercury in fly ashes by temperature programmed decomposition

Clean Coal Program Research Activities

Evaluation of the Variables that Influence Mercury Capture in Solid Sorbents

Contact Info

Product

Resources

About