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. Our latest innovation is a new, boiler wall-mounted hood enclosure design.
Our smelt spout can be utilized on any recovery boiler, and it is suitable for your local boiler condition. Valmet has a high set goal to be able to supply spare parts for our customers. 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
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 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
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
boiler through smelt spouts. One feature of recovery boilers is the presence of a char bed on the hearth. char bed. The char bed consists of a pile of partially pyrolyzed black liquor solids, carbonaceous material and inorganics that accumulate on the hearth. It acts as
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
The boiler had four smelt spouts. The runoff problems were clearly indicated by the abrupt change in exit temperature of the spout cooling water. Since all four spouts responded si-2. Summary of heavy runoff incidents in recovery boilers with different bottom types.
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
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
The failure resulted in a large amount of cooling water entering the boiler and contacting smelt around the spout opening, but fortunately no smelt-water explosion occurred.
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.
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
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
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.
Recovery Tasks” The Smelt Spout System and Shatter-Max™ Dual Shatter Jet are just two of the many auxiliary products Valmet offers under its SMaRT™ product line. Please contact Valmet for information on more SMaRT™ products to fulfill your lower recovery boiler needs. Dan Morrison
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.
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. US Patent for Recovery boiler smelt spout Patent A spout for a recovery boiler such as those used in the papermaking industry.
Dec 07, 2011· SMELT SPOUT OF RECOVERY BOILERarticle was posted by Unknown on 07 December, 2011.Thank you for your visit and your willingness to read this article. Criticism and suggestions can you convey through the comment box.
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
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.
For Air preheater, start-up burner, smelt spout steam shuttering. 3. Low Pressure Steam is returned to the mixing tank to be mixed with HBL Recovery Boiler is also equipped with security system 1. Interlock System This system serves to prevent damage in case of irregularities Boiler
Oct 20, 2012· Recovery boiler boiler is a special unit used for obtaining soda or to purify inorganic chemical compounds (chemical recovery) contained in the black liquor from the digester and the rest of the cooking as well as generating high-pressure steam (high pressure steam).
Smelt is the product of inorganic reactions in the recovery furnace. At the same time as the carbon is consumed, the residual inorganic portion melts. Inorganics flow out of the furnace through smelt spouts, Fig. 11.6 The amount of smelt inside the recovery boiler furnace has been measured by Kelly et al. (1981). Get A Quote
Oct 08, 2019· The factual part of this post has been taken out of the Spring 2018 BLRBAC meeting minutes. In September 2017, there was a smelt water reaction (explosion) in a recovery boiler
The molten smelt then flows out of the bottom of the recovery boiler through a number of smelt spouts to ensure sufficient drainage. The outflowing smelt stream is shattered into small droplets using one or more high pressure steam jets before falling into a dissolving tank. The smelt
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
Smelt is the product of inorganic reactions in the recovery furnace. At the same time as the carbon is consumed, the residual inorganic portion melts. Inorganics flow out of the furnace through smelt spouts, Fig. 11.6 The amount of smelt inside the recovery boiler furnace has been measured by Kelly et al. (1981). Get A Quote
The molten smelt then flows out of the bottom of the recovery boiler through a number of smelt spouts to ensure sufficient drainage. The outflowing smelt stream is shattered into small droplets using one or more high pressure steam jets before falling into a dissolving tank. The smelt
US Patent for Recovery boiler smelt spout Patent . 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 duct applying a
Reliable Cleaning of Recovery Boiler Smelt Spouts. system to give optimum boiler operation. Actual design will change depending on customer needs. The robot is available in standard sizes to suit any smelt spout layout, and behavior is designed to fit the specific boiler operation. The robot is also available with a range of advanced options.
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.
Oct 01, 2019· A total of 573 domestic recovery boiler incidents were reported to BLRBAC between fall 2009 and spring 2019. 4 Smelt Water Furnace Explosions. Boiler Location. Smelt Spout Failures
Dec 07, 2011· SMELT SPOUT OF RECOVERY BOILERarticle was posted by Unknown on 07 December, 2011.Thank you for your visit and your willingness to read this article. Criticism and suggestions can you convey through the comment box.
Smelt is the product of inorganic reactions in the recovery furnace. At the same time as the carbon is consumed, the residual inorganic portion melts. Inorganics flow out of the furnace through smelt spouts, Fig. 11.6 The amount of smelt inside the recovery boiler furnace has been measured by
Oct 20, 2012· Recovery boiler boiler is a special unit used for obtaining soda or to purify inorganic chemical compounds (chemical recovery) contained in the black liquor from the digester and the rest of the cooking as well as generating high-pressure steam (high pressure steam).
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 sootblowing system. *
the Valmet insertable smelt spout. This product is designed to provide a quick and reliable option for operators to intentionally terminate smelt flow to a smelt spout. • Perform maintenance or replacement • High temp refractory rated for use in recovery boiler
Recovery boiler smelt spout. Patent number: 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 duct
chloride (NaCl), and potassium salts. Molten smelt flows out of the boiler at 800°C to 850°C through several smelt spouts at a flow rate of 0.7 to 1.3 L/s per spout. As the smelt stream emerges from the spout trough, it is shattered by a steam jet into small, discrete droplets before falling into the dissolving tank underneath (Fig. 1).
The development of the recovery boiler by Tomlinson in conjunction with Babcock & Wilcox in the early 1930s led to the predominance of the kraft process. Fig. 17.7 shows a typical recovery boiler design, while Fig. 17.8 compares two types of boilers with widespread use. Fig. 17.9 shows a recovery boiler building at a brown paper mill. The purpose of the recovery boiler is to recover the