Recovery Boiler Smelt Spout

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Smelt spout recovery boiler - Domtar Limited

recovery boiler smelt spoutsSmelt spout for recovery boiler - Domtar Limited A non water cooled smelt spout for a pulp mill chemical recovery furnace. The spout is constructed from insulating and refractory materialDETEFMINATION OF THERMAL CONDUCTIVITY OF WCOVERY BOILER CHAR BED MATERIALSSketch of the lowrr furnace of a decanting-heanh recovery

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Smelt Spout System - Valmet

Smelt Spouts. The design, installation and maintenance of smelt spouts, used to discharge liquid smelt from the furnace to the dissolving tank, are important to the safe, reliable operation of Kraft recovery boilers. Since supplying the first Kraft recovery boiler in 1929, B&W has led the development of many improvements in safer, longer-lasting operation of smelt spout systems.

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4-1 Recovery Boiler Equipment and Operation

Spouts and Dissolving Tank Spouts – water-cooled troughs mounted in or on furnace at spout openings near hearth Spout cooling water system Agitated tank to dissolve smelt and make green liquor Shatter jets or other means to break up smelt stream as it enters the tank Sootblowers Use a steam jet to remove deposits Superheater Generating bank

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Autonomous recovery boiler

The smelt spout area is one of the least desirable work environments in a recovery boiler, nonetheless regular spout cleaning is needed for efficient and smooth operation. ANDRITZ has developed Smelt spout robot, a fully automated robot performing smelt spout cleaning on demand with the aid of AVA smelt flow measurement.

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Failure of Smelt Spouts in Kraft Recovery Boilers

4-1 Recovery Boiler Equipment and Operation

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A laboratory study of recovery boiler smelt shattering

In kraft recovery boiler operations, molten smelt (mainly consisting of sodium carbonate and sodium sulfide, and small amounts of sodium sulfate, sodium chloride, and potassium salts) flows out of the boiler at 800°C-850°C down a number of spouts, at a flow rate on the order of 1 L/s per spout, before falling into the dissolving tank below

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Recovery boiler - Wikipedia

Recovery boilers also improved the smelt removal. It is removed directly from the furnace through smelt spouts into a dissolving tank. Some of the first recovery units employed the use of Cottrell's electrostatic precipitator for dust recovery. Babcock & Wilcox was founded in 1867 and gained early fame with its water tube boilers.

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(PDF) Understanding recovery boiler smelt runoff phenomena

Smelt fluidity, the ability of smelt to flow out of recovery boiler spouts, is inversely related to smelt viscosity. Molten smelt has a viscosity value between 2.5 and 5 mPa*s, which is not

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Recovery Boiler Treatments | Solenis

Solenis offers a variety of chemical and equipment solutions for recovery boiler systems, including feedwater, condensate and internal boiler water treatments; organic and inorganic corrosion inhibitors for smelt spout cooling systems; monitoring and control systems; and proprietary statistical software that can detect leaks with maximum

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Improving Safety Around Recovery Boiler Operations - Paper

Mar 05, 2021 · Below are four inventions and innovations that have improved the working conditions around recovery boilers and made operation of the boiler more stable. Smelt Spout Micro Hood Arrangement. One area considered the most dangerous for operators, and one of the leading causes of recordable injuries is the spout deck on a recovery boiler.

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US6111232A - Recovery boiler smelt spout - Google Patents

Recovery boiler smelt spout Download PDF Info Publication number US6111232A. US6111232A US09/044,348 US4434898A US6111232A US 6111232 A US6111232 A US 6111232A US 4434898 A US4434898 A US 4434898A US 6111232 A US6111232 A US 6111232A Authority US United States Prior art keywords heating smelt heat spout

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(PDF) Smelt spout corrosion in a recovery boiler

Severe corrosion led to an in-service failure of one of the six spouts on a recovery boiler at Cenibra. The failure resulted in a large amount of cooling water entering the boiler and contacting

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Fornax Services

Jan 29, 2020 · Smelt spouts have a limited lifetime and that is due to thermal stresses but also erosion effect of the smelt flow during an operation. Molten smelt exits the recovery boiler at a temperature as high as 850 °C (1500 °F). So not surprisingly, the smelt spouts are under a lot of thermal stress.

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Smelt Spouts - Babcock & Wilcox

Smelt Spouts. The design, installation and maintenance of smelt spouts, used to discharge liquid smelt from the furnace to the dissolving tank, are important to the safe, reliable operation of Kraft recovery boilers. Since supplying the first Kraft recovery boiler in 1929, B&W has led the development of many improvements in safer, longer

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AMERICAN FOREST & PAPER ASSOCIATION AMERICAN …

• Liquor System - heavy black liquor storage through dissolving tank and smelt spout cooling system. • Boiler Water - boiler makeup treatment facilities and condensate return systems through recovery boiler steam outlet non-return valve. • Furnace Gas - Combustion air fan inlet through flue gas stack outlet including sootblower.

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US Patent for Recovery boiler smelt spout Patent (Patent

Recovery boiler smelt spout . Jul 10, 1987 - International Paper Company. A spout for a recovery boiler such as those used in the papermaking industry. As in prior art spouts of this type, the spout is provided with an internal cavity to thereby permit water cooling of the spout. By this invention, a duct is provided for the internal cavity

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Fornax Services

Jan 29, 2020 · Smelt spouts have a limited lifetime and that is due to thermal stresses but also erosion effect of the smelt flow during an operation. Molten smelt exits the recovery boiler at a temperature as high as 850 °C (1500 °F). So not surprisingly, the smelt spouts are under a lot of thermal stress.

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RECOMMENDED GOOD PRACTICE - BLRBAC

Recovery boiler explosions fall into four categories -- smelt water explosions, auxiliary fuel explosions, explosions from ignition of unburned gases from pyrolyzed black liquor, and dissolving tank explosions.

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BLRBAC COMMON PRACTICES

For Black Liquor Recovery Boilers Smelt Spout Deck Safety Considerations Condition Hazard Suggested Precautions Smelt splatter from spouts Chemical and temperature burns caused by splashing out of spout. Install a system/method to remotely adjust the angle of the shatter spray jet. Smelt splatter from spouts Smelt plugging of spouts.

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TIP 0416-23 Explanation of recovery boiler leak indications

TIP 0416-23 Explanation of recovery boiler leak indications/ 4 Color change in smelt at spouts As in the case of a bed blackout, contact cooling of smelt from water/steam may result in a change of color. If there is water present near the point where smelt exits the furnace, then it is likely that the smelt will take on a darker color.

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