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  • Retardation of High-Temperature Fuel Ash Corrosion of

    Sep 12, 2016 · The high-temperature corrosion rate of boiler tubes was studied as a function of inhibitor concentration, time, and temperature in the absence and presence of fuel ash. Samples of steel tubes were taken from boilers that operate in Northern Baghdad Station for Electric Power Generation. Fuel ash was collected from the boiler combustion chamber, as well. Normal and nano-MgO were used as a Learn More

  • Analysis of Ash Melting Behaviour (Oxidising Conditions

    The process of ash melting is complex and can involve sintering, shrinkage, and swelling. If the ash melting temperature is too low then it will lead to slagging, fouling and corrosion in boilers and that will reduce conversion efficiency. The method of analysing for ash melting behaviour involves heating the ash up in a controlled manner and determining a number of characteristic temperatures at which the ash …Learn More

  • The Role of Fireside Corrosion on Boiler Tube Failures

    Jun 01, 2010 · The melting points of K 2 S 2 O 7 and Na 2 S 2 O 7 are 750F and 570F, respectively. Mixtures of these two compounds could melt at even lower temperature. Mixtures of these two compounds could melt Learn More

  • Interactions of PbCl2 with Alkali Salts in Ash Deposits

    A novel temperature gradient laboratory-scale corrosion test method was used to study PbCl2 migration, interactions with SiO2, NaCl, Na2SO4, KCl, K2SO4, or NaCl–KCl (50:50 wt %) and corrosion of carbon steel in waste-fired boilers. Two different steel temperatures (200 and 400 °C) were tested. The temperature in the furnace above the deposits was 700–800 °C.Learn More

  • Basics of Boiler and HRSG Design - PennWell Books

    Table 3-12 Melting temperatures of complex minerals found in coal ash . . .73 Table 3-13 Mineral relationships important to ash fusion temperatures . . . .74 Table 3-14 Ash content and fusion temperatures of some U.S. coals . . . . . .77Learn More

  • Vanadium-Containing Oil Ash Corrosion of Boilers Under

    Jan 20, 2015 · Oil ash corrosion first became an acute problem in 1950 []; it is always taken into consideration when designing new boilers, since it still causes tube failures in existing units.Several boilers have seen high wastage rates of furnace wall tubes. The wastage is usually most pronounced in the bottom portion of the furnace where saturation vapor pressures are high, resulting in tube metal Learn More

  • Cause of Boiler Tube Failures - Chicago Tube & Iron

    Fuel ash corrosion Fuel ash corrosion is a high-temperature phenomenon in coal and oil-fired boilers. In oil-fired boilers, sodium sulfate combines with vanadium pentoxide to form a very corrosive coating of molten "slag" on the fireside tube surface of superheater and reheater tubes.Learn More

  • Cause of Boiler Tube Failures - Chicago Tube & Iron

    Fuel ash corrosion Fuel ash corrosion is a high-temperature phenomenon in coal and oil-fired boilers. In oil-fired boilers, sodium sulfate combines with vanadium pentoxide to form a very corrosive coating of molten "slag" on the fireside tube surface of superheater and reheater tubes.Learn More

  • Valmet's new online ash analyzer offers significant

    Apr 12, 2021 · BFB boiler plants Pellet plants Oil and gas plants. Now, with the online analyzer, control of actual ash chemistry is possible and boiler cleaning together with operational costs can be optimized on a continuous basis," says Timo Laurila and transferred to the analyzer where chemical analyses and ash melting …Learn More

  • Basics of Boiler and HRSG Design - PennWell Books

    Table 3-12 Melting temperatures of complex minerals found in coal ash . . .73 Table 3-13 Mineral relationships important to ash fusion temperatures . . . .74 Table 3-14 Ash content and fusion temperatures of some U.S. coals . . . . . .77Learn More

  • Typical Causes of Slagging and Fouling Problems in …

    Jun 01, 2015 · Above 2,250F on a bulk gas basis, it becomes close to the melting temperature of the ash in some fuels. Fuels with extremely high ash fusion temperatures are thought of as being "boiler friendly Learn More

  • Retardation of High-Temperature Fuel Ash Corrosion of

    Sep 12, 2016 · The high-temperature corrosion rate of boiler tubes was studied as a function of inhibitor concentration, time, and temperature in the absence and presence of fuel ash. Samples of steel tubes were taken from boilers that operate in Northern Baghdad Station for Electric Power Generation. Fuel ash was collected from the boiler combustion chamber, as well. Normal and nano-MgO were used as a Learn More

  • Regn No: Name

    In an FBC boiler with low ash fusion coal, if the bed temperature exceeds 950°C, the result is: a) Low steam temperature b) clinker formation c) Melting of lime stones d) Ash carry over 47. Electrical energy consumption for coal sizing will be maximum for a) stoker fired boiler b) AFBC boilerLearn More

  • 4-7 Recovery Boiler Fireside Deposits and Plugging Prevention

    melting temperature "ash" or smelt. The large quantity and the low melting temperature of the ash make black liquor one of the most troublesome industrial fuels used for steam and power generation. Deposition of fly-ash on tube surfaces in the upper furnace of recovery boilers is a persistent problem in many kraft pulp mills. MassiveLearn More

  • Analysis of Ash Melting Behaviour (Oxidising …

    Ash melting, also known as ash fusion and ash softening, can occur at high temperatures and is of particular importance in thermal conversion processes.The process of ash melting is complex and can involve sintering, shrinkage, and swelling. If the ash melting temperature is too low then it will lead to slagging, fouling and corrosion in boilers …Learn More

  • Oil Ash Corrosion — A Review of Utility Boiler Experience

    Feb 01, 1991 · Factors influencing oil ash corrosion include fuel chemistry, boiler operation, and boiler design. These factors are interdependent and determine the corrosion behavior in utility boilers. Oil ash corrosion occurs when vanadium-containing ash deposits on boiler tube surfaces become molten.Learn More

  • What are the causes and treatment methods - ZOZEN Boiler

    Jul 03, 2020 · Influencing factors of slagging on heating surface of boiler (1) Ash characteristics of pulverized coal. Generally, the softening temperature ST of ash is used as the main indicator of slag formation. Coal with low ash melting point (ST1200℃) is easy to slag. In addition, the slagging index also includes: silicon ratio, alkali-acid ratio Learn More

  • (PDF) Chemical and Physical Characterization of Boiler …

    Chemical and Physical Characterization of Boiler Ash from Palm Oil Industry Waste for Geopolymer Composite December 2013 Revista de Chimie -Bucharest- Original Edition- 64(12):1408Learn More

  • Ash related challenges from a boiler manufacturer's point

    Dust burner boilers Oil & Gas Boilers CFB boilers CFB Gasifier Recovery boilers 7 February 5th, 2019. BFB main components The role of chemistry in a heat and power plant 17 K 2 SO 4 Na 2 SO 4 K 2 Si 4 O 9 Na 2 Si 4 O 9 PbCl 2, Low melting ash Na+ Zn2+ Pb2+ …Learn More

  • Fuel Ash Corrosion - The National Board of Boiler and

    The corrosive species are different for coal and oil-fired boilers. Mixtures of vanadium pentoxide and sodium oxide or vanadium pentoxide and sodium sulfate are the principal offensive compounds in oil ash. For coal-fired boilers, sodium and potassium iron trisulfates are the liquid species blamed for high-temperature corrosion. DEW-POINT CORROSIONLearn More

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