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.
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 . 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
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.
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
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.
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.
Spout robot Our Spout robot efficiently removes smelt deposits from recovery boiler smelt spouts in a carefully designed sequence. The spout rodder ensures stable smelt flow, optimum cleaning and trouble free, safe boiler operation. The robot will keep your smelt spouts clean, saving you time and money. Easily integrated in any spout area
Molten smelt accumulates on the floor (protected from overheating by refractory or by solidified smelt) to a level of several inches before flowing out water-cooled smelt spouts to the smelt dissolving tank. It is the pool of molten smelt, at a temperature of 1700°F - 1800°F (925°C - 980°C) that presents the …
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.
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 …
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
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
Apr 12, 2021 · The boiler also features a unique vertical air system to minimize air emissions. The scope of supply also comprised: Engineering for the entire system except civil work and electrical and automation equipment; Complete pressure parts; Auxiliaries such as start-up oil burners, black liquor burners, smelt spouts; Safety-related system (SRS)
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
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
FIG. 3 is an enlarged cross-sectional view of a smelt pour spout of a recovery boiler in a shut-down status with a heating element of this invention inserted therein. FIG. 4 is an enlarged cross-sectional view of a frozen smelt pour spout of a recovery boiler having a heating element of …
Recovery boiler smelt spout . United States Patent 4750649 . Abstract: 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, the
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.
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.
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.
Jan 30, 2020 · Smelt spouts are an integral part of a recovery boiler operation, aiding in the removal of the molten smelt from the lower furnace and safely directing it to the dissolving tank where it dissolves