Recovery Boiler Smelt Spout


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The boiler adopts an environmentally friendly combustion method - full premixed combustion, and the gas and air are precisely adjusted and premixed in advance to ensure more complete combustion.


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The boiler adopts a double-drum longitudinal "D" type arrangement structure; water, steam or steam-water mixture flows in the pipe; flame burns and flue gas flows outside the pipe, forming extremely fast steam-water.

Recovery Boiler Smelt Spout Related Information

Smelt spout robot

furnace section of recovery boiler & smelt stream Could trigger a smelt-water explosion capable of destroying the boiler Significance manifested through published set of recommendations for proper smelt cooling system design, operation & maintenance BLRBAC suggests annual replacement – Ensures that failures are rare, but

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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.

4-1 Recovery Boiler Equipment and Operation

Jul 08, 2015 · Our recovery boiler. Smelt comes out of and into dissolving tank

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in power and recovery boilers SAC susceptible locations in the lower furnace of a recovery boiler include, but are not limited to, connections and locally strained places at corners of wind boxes, smelt-spout hood attachments and floor seal welds. As stated above,

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


• 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.


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.

Recovery boiler smelt spouts - YouTube

The black liquor recovery boiler presents problems of operation and safety that far exceed those of the conventional power boiler. It is primarily a chemical recovery process unit in which the organic materials in the black liquor are burned while the sodium salt is reduced and drained as molten smelt …

Smelt spout robot for recovery boiler - ANDRITZ

flue gas from the boiler Operate on a balanced draft FD Fan ID Fan Recover Inorganic Chemicals Recover the inorganic chemicals as a molten smelt of Na 2S and Na 2CO 3 Na 2S requires a local reducing (oxygen deficient) environment Some S leaves as Na 2SO 4 – incomplete reduction measured by reduction efficiency Runs out of the furnace through spouts

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Apr 14, 2020 · Recovery boiler – Wikipedia. Recovery boiler is the part of Kraft process of pulping where chemicals for white liquor are MacCallum presented the design at BLRBAC and in a paper "The Radiant Recovery boilers have been the preferred mode of Kraft mill chemical . Ask Price View More; Pulp & Paper – Babcock & Wilcox. Recovery Boilers. Pulp

Smelt spout robot for recovery boiler - ANDRITZ

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.


The smelt spout area of a recovery boiler is one of the least desirable and sometimes also a dangerous place to work. However, essential regular tasks need to be carried out for efficient and smooth operation of the boiler. Smelt can cause several issues in the spout area as it tends to coagulate and plug the spouts and needs regular cleaning.

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

US7891325B2 - Cleaner for the smelt spout of a recovery

FIG. 1 shows a typical smelt spout area of a recovery boiler, which comprises smelt spouts 1, along which the smelt is directed from the furnace 2 to the dissolving tank 3. Typically, the smelt is very hot (for example 750 to 820° C.). The possible splashes of smelt cause danger to the personnel working and moving in the surroundings.


Smelt Spout • Insertable, water cooled and self leveling design • Includes built-in, pre-poured refrac-tory seal box for superior interface • Steep, robust, U-shaped trough ensures positive flow of smelt and reduces build-ups • Delivers fast, steady and consistent smelt stream for ideal shattering capabilities

Smelt Spouts - Babcock

The smelt spout area of a recovery boiler is one of the least desirable and sometimes also a dangerous place to work. However, essential regular tasks need to be carried out for efficient and smooth operation of the boiler. Smelt can cause several issues in the spout area as it tends to coagulate and plug the spouts and needs regular cleaning.

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Kraft recovery boilers – High dry solids firing – ResearchGate. tioning chemical recovery gave kraft pulping an economic boiler with- out auxiliary fuel firing at 65 % of rated MCR (Ris- Australian Paper has employed a process where liq- uor from residue, smelt exits through smelt spouts-9 …

Failure of Smelt Spouts in Kraft Recovery Boilers

Our smelt spout can be utilized on any recovery boiler, and it is suitable for your local boiler condition. The smelt spout is based on proven technology, and our smelt spout area is a complete solution with tube openings, wall box, spout, hoods, shattering equipment and washing of doghouse. We are continuously improving the lifetime of the smelt spout and working on minimizing the risk of dangerous situations with smelt spouts. The benefits of our smelt spout cooling …

Smelt Spout | 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.

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.