removal of external deposits of boiler tubes

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    Boiler Cleaning with Explosions It has been known for quite some time that accumulations of sticky or hardened deposits on boiler tubes and walls can be

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  • Corrosion in boilers - Lenntech

    Deposits also promote the transport of oxygen to the metal surface. Corrosion in the boiler proper generally occurs when the boiler water alkalinity is low or when the metal is exposed to oxygen bearing water either during operation or idle periods. High temperatures and stresses in the boiler metal tend to accelerate the corrosive mechanisms.

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  • CAUSES OF DAMAGE TO BOILER - Metropolitan

    2019-2-7 · Boiler feedwater is treated to protect it from two basic problems: the buildup of solid deposits on the interior or water side of the tubes, and corrosion. Prevention of scaling or buildup - The need for proper feedwater treatment is obvious if you will consider the comparison of a boiler and a pot of boiling water on the stove.

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  • The soot and scale problems - Danfoss Heating

    2014-9-12 · The soot and scale problems Page 5 NOTES Figure 2: Fire tube with soot inside and scale outside Figure 2 shows a fire tube with soot inside the tube. In a fire tube boiler the hot combustion gases pass through a bundle of tubes and release part of their energy to the water at the outside.

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  • Effect of High Temperature on Rear Pass Boiler Tubes in

    : Effect of High Temperature on Rear Pass Boiler Tubes in Coal-Fired Power Plant . Continuous Rate (BMCR), (ii) s even elevations, (28) of, coal burners located just above or below a fuel oil burner. The capacity of coal burners is BMCR when firing coal within the

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  • SYSTEM AND METHODS FOR DETECTING,

    2018-7-12 · The vibration measuring devices 14 at locations I and II measured the movement of the heat exchanger surfaces 48 as changes in amplitude and/or frequency of the heat exchanger surfaces 48 during the movement of the lance tube in the boiler system for the removal and or detection of deposits 20 on the heat exchanger surfaces 48.

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  • Using Explosives for Boiler Deslagging - powermag.com

    2012-3-28 · Slagging is the formation of molten, partially fused or re-solidified deposits on furnace walls and other surfaces exposed to radiant heat. Over a period of time, a base deposit of slag may also

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  • Boiler Inspections

    2015-11-3 · the boiler prior to shutdown. Follow the boiler manufacture's cool down procedure and be sure to rinse out the boiler as soon as the boiler is cool to avoid dried and baked on sludge deposits later on. If the cooled boiler is to be left filled with water for an extended period of time, take the proper

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  • Sulphate capture in ash and boiler deposits in relation

    The last column of Table 5 shows that with the exception of one coal, Sample 4, there was a net transfer of alkalis to fused silicates during the combustion. Sulphate capture in ash and boiler deposits in relation to SO2 emission 267 0.4 -- 0.2 OI ] I os io IIs VOLATILIZABLE SODIUM TOTAL POTASSIUM A - COAL SILICATES B - MUSCOVITE C - ORTHOCLASE

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  • Industries and Applications - arcticblastinc.com

    2019-1-29 · Removal of deposits, metal oxidation, ceramic and sand core materials for casting, furnaces and paddles. HIGHWAY MAINTENANCE : Cleaning of grease, vegetation, mud tar, cement or asphalt on vehicles & machinery. Removal of expansion joints, paint strips and concrete demolishing on road bridges. Manhole cleaning. MARINE & OFFSHORE

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  • Using Explosives for Boiler Deslagging - powermag.com

    2012-3-28 · Slagging is the formation of molten, partially fused or re-solidified deposits on furnace walls and other surfaces exposed to radiant heat. Over a period of time, a base deposit of slag may also

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  • Fouling in Heat Exchangers - InTech - Open

    2012-9-24 · Fouling in Heat Exchangers as scale, algae, suspended solids and insoluble salts on the internal or external surfaces of processing equipment including boilers and heat exchangers (Fig 1). Heat exchangers are and maintenance costs resulting from the removal of fouling deposits with chemicals and/or mechanical antifouling devices or the

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  • A New Approach to Boiler, Pipeline and Turbine Inspections

    2012-3-29 · scale deposits depending on uniformity and type, however a clean surface provides the best results. The norm is for economizer tubes to be finned and the problem is very often external erosion, Figure 6: Left – Main Bank Boiler tubes, with colour coded results according to remaining wall thickness. Right – Economizer bank tubes with

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  • Reducing Corrosion and potential Boiler Failure with

    2010-1-10 · deposits are of less concern and corrosion has become the major subject to control. Pre-boiler corrosion – Metal transport to boiler from external equipments Pre-boiler corrosion will include corrosion in all steam – condensate network and also in boiler feed water section. Therefore corrosion in all areas that at the end will

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  • Boiler Tube Failures - eecpowerindia.com

    2013-12-6 · Cost of boiler tube failures 9/4/2013 Steag O&M Company 7 The cost of boiler tube failures is comprised of three main components; the cost of the repair, the cost of start up oil to return unit to service, and the cost of lost production. A rule of thumb for

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  • Lissapol N as aid to removal of external deposits from

    Details of ADM 249/334; Reference: ADM 249/334 Description: Lissapol N as aid to removal of external deposits from generator, superheater and economiser tubes of water tube boilers

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  • Effect of High Temperature on Rear Pass Boiler Tubes in

    : Effect of High Temperature on Rear Pass Boiler Tubes in Coal-Fired Power Plant . Continuous Rate (BMCR), (ii) s even elevations, (28) of, coal burners located just above or below a fuel oil burner. The capacity of coal burners is BMCR when firing coal within the

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  • Boiler Chemical Cleaning: Doing It Correctly -

    2014-1-9 · Everyone knows (or should know) that boiler tubes containing deposits create long-term reliability problems for the boiler. Deposits insulate the water in the tubes from the fire, causing the

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  • Boiler tube scale deposit measurement reduces energy

    2016-3-29 · removal of sample tubes for DWD analysis, and based on the DWD results may be chemically cleaned. Meanwhile, the boiler water chemistry must be strictly controlled, as a delay of one or two years on a fouled boiler can result in major tube damage. The type of boiler (recovery vs. power) and how it is used also affect the cleaning strategy.

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  • ASTM D3483-2005

    2017-12-9 · ASTM D3483-2005,The weight per unit area measurement is an indication of the relative cleanliness or dirtiness of the boiler. It is used to determine the effectiveness of the

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