Prevention of Residual Oil Combustion Problems by Use of Low Excess Air and Magnesium Additive

Reese, J. T.; Jonakin, J.; Caracristi, V. Z.

doi:10.1115/1.3678175

Cited by 6 publications

(4 citation statements)

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“…44 The location in the flue gas stream and the delivery method of the alkali have been studied and tested depending on operating and site conditions.…”

Section: Alkali Addition Into the Furnacementioning

confidence: 99%

“…13,23,44,45 This research has resulted in the development, refinement, and implementation of different techniques and methods for the successful mitigation of SO 3 in the flue gases of fossil-fuel-fired boilers. Recently, a guide that summarizes SO 3 mitigation options and their respective success in either full-scale or pilot testing has been written.…”

Section: Mitigation Of So 3 Emissionsmentioning

confidence: 99%

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Emissions of Sulfur Trioxide from Coal-Fired Power Plants

Srivastava

Miller

Erickson³

et al. 2004

Journal of the Air & Waste Management Association

248

195

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Emissions of sulfur trioxide (SO 3 ) are a key component of plume opacity and acid deposition. Consequently, these emissions need to be low enough to not cause opacity violations and acid deposition. Generally, a small fraction of sulfur (S) in coal is converted to SO 3 in coal-fired combustion devices such as electric utility boilers. The emissions of SO 3 from such a boiler depend on coal S content, combustion conditions, flue gas characteristics, and air pollution devices being used. It is well known that the catalyst used in the selective catalytic reduction (SCR) technology for nitrogen oxides control oxidizes a small fraction of sulfur dioxide in the flue gas to SO 3 . The extent of this oxidation depends on the catalyst formulation and SCR operating conditions. Gas-phase SO 3 and sulfuric acid, on being quenched in plant equipment (e.g., air preheater and wet scrubber), result in fine acidic mist, which can cause increased plume opacity and undesirable emissions. Recently, such effects have been observed at plants firing high-S coal and equipped with SCR systems and wet scrubbers. This paper investigates the factors that affect acidic mist production in coal-fired electric utility boilers and discusses approaches for mitigating emission of this mist. INTRODUCTIONAs understanding of the adverse effects of air pollution has grown, so also has the complexity of coal-fired power plant design and operation, especially with regard to air pollution control systems. Control of air pollutant emissions is not only a legal requirement but also is becoming a financial necessity, as salability of effluents and trading of emissions increase the direct monetary value of emissions control. The days when one must only consider the nuisance value of fly ash are long past. 1 As plant complexity has increased, so have unexpected consequences of changing segments of the total chemical process that occurs between fuel preparation and ultimate emissions. One of the more discernible adverse consequences is the formation and emission of sulfur trioxide (SO 3 )/sulfuric acid (H 2 SO 4 ), as highlighted by the recent and well-publicized experiences of a power plant in Ohio. 2 Although not directly subject to emission limits, SO 3 is important to consider during the design and operation of coal-fired utility boilers for a number of environmental and plant performance reasons.The formation of SO 3 will occur during the combustion of sulfur (S)-bearing fuels such as coal and heavy fuel oils. Virtually all of the SO 3 converts to H 2 SO 4 as flue gas is cooled in the air preheater (APH). Relatively high concentrations of SO 3 /H 2 SO 4 in the boiler, stack, or plume can cause adverse impacts to plant equipment and to the environment. Impacts on plant equipment can include corrosion, fouling, and plugging and may require additional hardware or changes in operation to minimize SO 3 / H 2 SO 4 concentrations and the resulting adverse impacts.

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“…44 The location in the flue gas stream and the delivery method of the alkali have been studied and tested depending on operating and site conditions.…”

Section: Alkali Addition Into the Furnacementioning

confidence: 99%

Section: Mitigation Of So 3 Emissionsmentioning

confidence: 99%

Emissions of Sulfur Trioxide from Coal-Fired Power Plants

Srivastava

Miller

Erickson³

et al. 2004

Journal of the Air & Waste Management Association

248

195

View full text Add to dashboard Cite

show abstract

“…Glaubitz (1960Glaubitz ( , 1961Glaubitz ( , 1962 reported that a boiler furnace equivalent to approximately a 25-Mw unit was operated sat isfactorily for 4 years at 0.2% 09. Reese (1965) reported an oilfired, 135-Mw tangential unit that was operated at 0.5% 0-while still maintaining acceptable carbon levels (99.9% carbon combustion efficiency, CCE) in the flyash.…”

Section: Imentioning

confidence: 99%

“…This means that in addition to S0_, other potential sulfur compounds will be produced -H"\>, COS and S . Under reducing conditions, essentially no SO will be present (Reese, 1965) .…”

mentioning

confidence: 99%

Development of a feasible process for the simultaneous removal of nitrogen oxides and sulfur oxides from fossil fuel burning power plants

Clay

Lynn

1974

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Sodium vanadate induced corrosion of MCrAlY coatings – Burner rig studies

Seiersten¹,

Rätzer‐Scheibe

1987

Materials & Corrosion

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Dedicated to Professor Dr. Alfred Rahmel on the occasion of his 60th birthdayThe corrosion of several MCrAIY-coatings (M = Ni, Fe and Ni + Co) has been studied in a high velocity burner rig at 650, 800 and 950°C. The fuel used 'was diesel oil with additions of 3% sulphur, 200 ppm vanadium and 100 ppm sodium.The deposits formed on the specimens mainly consisted of sodium vanadates which were molten at the test temperature. Sodium sulphate was only found at and below 650°C. The corrosion mechanism involved was vanadate-induced hot corrosion. This corrosion mechanism is characterized by the formation of an oxide layer adjacent to the metal, the dissolution of oxide in the molten deposit, and precipitation of vanadates or oxides near the outer surface of the deposit. The continuous deposition of fresh vanadate on the surface served to maintain high corrosion rates for extended exposures. Das Korrosionsverhalten einiger MCrAIY-Schutzschichten(M = Ni, Fe und Ni + Co) wurde mit Hilfe eines Hochgeschwindigkeits-Brennerprufstandes bei 650, 800 und' 950 "C untersucht. Als Brennstoff wurde Diesel01 verwendet, dem 3% Schwefel, 200 ppm Vanadium und 100 ppm Natrium zugesetzt wurde.Die Ablagerungen auf den Proben bestanden hauptsachlich aus Natriumvanadaten, die bei den Versuchstemperaturen im geschmolzenen Zustand vorlagen. Natriumsulfat wurde nur bei und unterhalb 650 "C gefunden. Die abgelagerten Vanadate induzierten die HeiRgaskorrosion. Der Korrosionsmechanismus kann wie folgt beschrieben werden: Bildung einer Oxidschicht auf dem Metall, Auflosung des Oxides in der geschmolzenen Ablagerung und Ausscheidung von Vanadaten oder Oxiden nahe der auReren Oberflache der Ablagerung.

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Prevention of Residual Oil Combustion Problems by Use of Low Excess Air and Magnesium Additive

Cited by 6 publications

References 0 publications

Emissions of Sulfur Trioxide from Coal-Fired Power Plants

Emissions of Sulfur Trioxide from Coal-Fired Power Plants

Development of a feasible process for the simultaneous removal of nitrogen oxides and sulfur oxides from fossil fuel burning power plants

Sodium vanadate induced corrosion of MCrAlY coatings – Burner rig studies

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