Role of exhaust gas recycle on submicrometer particle formation during oxy-coal combustion

Wang, Xiaofei; Daukoru, Selegha; Torkamani, Sarah; Wang, Wei‐Ning; Biswas, Pratim

doi:10.1016/j.proci.2012.07.049

Cited by 14 publications

(10 citation statements)

References 24 publications

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“…The particle size distribution in the flue gas from PRB coal combustion is shown in Figure 7. The size distribution is typical for coal combustion Suriyawong et al, 2006;Li et al, 2009b;Wang et al, 2013b). Figure 7 also shows that the ESP can remove at least 99.7% of the fly ash particles.…”

Section: Effect Of Particles In Flue Gasmentioning

confidence: 80%

“…In the second system (Figure 1b), coal was combusted in a drop-tube furnace (Lindberg/Blue; ThermoElectronCorp., Madison, WI, USA) Suriyawong et al, 2006;Wang et al, 2013b). Pulverized PRB (Powder River Basin) sub-bituminous coal (supplied by Ameren UE, St. Louis, MO) was used in the experiment without KI addition, whereas Chinese S03 coal was used in the KI addition case.…”

Section: Methodsmentioning

confidence: 99%

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Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Wang

et al. 2014

Journal of the Air & Waste Management Association

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Corona discharge based techniques are promising approaches for oxidizing elemental mercury (Hg 0 ) in flue gas from coal combustion. In this study, in-situ soft X-rays were coupled to a DC (direct current) corona-based electrostatic precipitator (ESP). The soft X-rays significantly enhanced Hg 0 oxidation, due to generation of electrons from photoionization of gas molecules and the ESP electrodes. This coupling technique worked better in the positive corona discharge mode because more electrons were in the high energy region near the electrode. Detailed mechanisms of Hg 0 oxidation are proposed and discussed based on ozone generation measurements and Hg 0 oxidation behavior observations in single gas environments (O 2 , N 2 , and CO 2 ). The effect of O 2 concentration in flue gas, as well as the effects of particles (SiO 2 , TiO 2 , and KI) was also evaluated. In addition, the performance of a soft X-rays coupled ESP in Hg 0 oxidations was investigated in a lab-scale coal combustion system. With the ESP voltage at +10 kV, soft X-ray enhancement, and KI addition, mercury oxidation was maximized.Implications: Mercury is a significant-impact atmospheric pollutant due to its toxicity. Coal-fired power plants are the primary emission sources of anthropogenic releases of mercury; hence, mercury emission control from coal-fired power plant is important. This study provides an alternative mercury control technology for coal-fired power plants. The proposed electrostatic precipitator with in situ soft X-rays has high efficiency on elemental mercury conversion. Effects of flue gas conditions (gas compositions, particles, etc.) on performance of this technology were also evaluated, which provided guidance on the application of the technology for coal-fired power plant mercury control.

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Section: Effect Of Particles In Flue Gasmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Wang

et al. 2014

Journal of the Air & Waste Management Association

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“…The coexistence of steam with HCl and SO 2 promoted the conversion of chlorides into molten aluminosilicates and, thus, the extent of ash particle agglomeration. Nevertheless, in the work by Wang et al, the introduction of H 2 O alone into the O 2 –CO 2 systems was found to increase the growth rate of submicrometer particles. It was attributed to the enhancement of particle nucleation and catalytic CO oxidation on char surface by increased water vapor.…”

Section: Ash Formation and Deposition In Oxy-pfcmentioning

confidence: 97%

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

et al. 2021

Energy Fuels

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To alleviate the global warming issue, various CO 2 abatement technologies have been proposed. As one of the leading options for CO 2 capture in power plants mostly firing coal and biomass, the oxyfuel combustion technology has been actively developed for decades. Progress at different stages of the development has been continuously updated in several reviews. However, they usually cover a wide range of topics, which vary significantly in detail. The ash issues are very critical to the design and operation of oxyfuel boilers, but may be one of the most controversial topics. The knowledge is widely scattered in different research articles, and a relatively comprehensive description is not available in the published reviews. Therefore, it is difficult for one to have a clearer picture of this important topic. The present review attempts to provide a more complete understanding. It pays particular attention to experimental data, because they are the basis for model development and full-scale simulation. Different from previous reviews that presented limited information on mineral matter transformation under oxyfuel conditions, this Review summarizes most of the related results reported in the open literature. Data on ash formation and deposition in oxyfuel combustion are also updated. They are organized according to different combustion technologies, i.e., oxyfuel pulverized fuel combustion (oxy-PFC) and oxyfuel fluidized bed combustion (oxy-FBC). By correlating between the three aspects, an in-depth understanding of ash issues in oxyfuel combustion may be achieved. At the end of this Review, key messages regarding mineral matter transformation, ash formation and deposition in oxyfuel combustion, and future research needs are presented.

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“…Again, no significant difference was observed. Calcium (Ca) is one of the dominant species in particulate matter, since PRB coal has high calcium content (Wang et al, 2013). Other major species include silicon (Si), iron (Fe), sulfur (S), titanium (Ti) and potassium (K).…”

Section: Oxidation Hg 0 By Mixing V 2 O 5 With Coalmentioning

confidence: 99%

Mercury oxidation during coal combustion by injection of vanadium pentoxide (V2O5)

Wang

et al. 2017

International Journal of Coal Geology

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Although there are many commercially available methods to capture Hg emission from coal combustion, it is still difficult to use a single method that can control Hg emission both efficiently and economically from coal combustors due to the varying coal seams, operating conditions and downstream control devices. One methodology is the use of sorbent injection at elevated temperatures; and is examined in this study. V 2 O 5 was tested as the sorbent and was found to effectively oxidize elemental mercury (Hg 0). Ultrafine V 2 O 5 particles are formed during the combustion process resulting in a high surface area aerosol that can effectively catalyze the oxidation of Hg 0. The effect of varying chlorine (Cl) concentration in coal on Hg 0 oxidation was also examined. The result shows that Cl can enhance Hg 0 oxidation on the V 2 O 5 surface.

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Role of exhaust gas recycle on submicrometer particle formation during oxy-coal combustion

Cited by 14 publications

References 24 publications

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

Mercury oxidation during coal combustion by injection of vanadium pentoxide (V2O5)

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