Failure of Smelt Spouts in Kraft Recovery Boilers

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

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Smelt Spouts » Babcock & Wilcox

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

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Root Cause Analysis of Performance Anomalies in Soot Blowers of Chemical Recovery Boiler …

the recovery boiler by G.H.Tomlinson in the early 1930s was a milestone in the advancement of the kraft process. 1) Description The chemical recovery boiler at SPB Ltd is a single drum, finned tube, top-supported natural circulation, drainable functions.

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2014 Corrosion Symposium Presentations | Renewable …

Recovery Boiler Corrosion Chemistry Sandy Sharp Corrosion control and materials engineering consultant, SharpConsultant Failure of Smelt Spouts in Kraft Recovery Boilers Doug Singbeil Research Manager, FPInnovations Flow Induced Corrosion in Pulping

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RECOMMENDED GOOD PRACTICE - BLRBAC

In January 1962, the Black Liquor Recovery Boiler Advisory Committee was formed by representatives of the pulp and paper industry, manufacturers of black liquor recovery boilers and insurance companies providing coverage on black liquor recovery boilers.

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Smelt Spout Corrosion in a Recovery Boiler, 2010 TAPPI/PAPTAC …

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 smelt around the spout opening, but fortunately no smelt-water explosion occurred. An extensive investigation was conducted to determine the causes of

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Composite tube cracking in kraft recovery boilers: A state-of-the …

1997/7/1 · The U.S. Department of Energy's Office of Scientific and Technical Information OSTI.GOV Technical Report: Composite tube cracking in kraft recovery boilers: A state-of-the-art review

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COOLING CHARACTERISTICS AND THERMAL PROPERTIES OF KRAET RECOVERY BOILER SMELT

Schematic dlagram O€ a kraft recovery boiier (Ah et ai., 1997). b recovery boilers, the floor is covered with molten smelt, mainly sodium carbonate and sodium sulfide, at 700-800°C during operation.

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(PDF) Fireside corrosion in kraft recovery boilers

Causes and corrective measures are reviewed for several common types of fireside corrosion in kraft recovery boilers. Smelt spouts are exposed to severe operating conditions; smelt is flowing

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Stress Assisted Corrosion in Boiler Tubes - Failure Analysis | ORNL

2007/3/1 · Stress assisted corrosion (SAC) of carbon steel boiler tubes is one of the major causes of waterside failure in industrial boilers. SAC is a major concern for kraft recovery boilers in the pulp and paper industry as any water leak into the furnace can cause a smelt-water explosion in the boiler. Failed carbon steel boiler tubes from different

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Analysis of cracking of co-extruded recovery boiler floor tubes …

1997/8/1 · Cracking of the stainless steel layer in co-extruded 304L/SA210 tubing used in black liquor recovery boilers is being found in an ever-increasing number of North American pulp and paper mills. Because of the possibility of a tube failure, this is a significant safety issue, and, because of the extra

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Black Liquor Recovery Boilers - An Introduction

Black Liquor Recovery Boilers - An Introduction David Parrish Factory Mutual Research Corp. Winter 1998 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

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WHY DO KRAFT RECOVERY BOILER COMPOSITE FLOOR TUBES …

failure of carbon steel floor tubes. Use of composite tubes on recovery boiler floors was first implemented in Scandinavia around 1978, while the first use in North America occurred in the early 1980s [2,3]. A few years after composite tubes were adopted for use

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4-1 Recovery Boiler Equipment and Operation

4.1-2 toward the hearth. At normal furnace temperatures they are in a molten (liquid) state and can be drained from the 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

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Smelt-X and Wash-X services for chemical recovery boilers

The Smelt-X and Wash-X services will save a huge amount of time for companies who need their recovery boiler systems cleaned. Our process will do no damage to your boiler and have you back operating at full strength much faster than any other process on the market. Please contact Mike Ward to arrange an in person meeting to discuss how our

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Fornax Services

2020/1/29 · Recovery Boiler Smelt Spouts Pulp and Paper. 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 into a green liquor. This system includes many other elements including the entire dissolving tank

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5-5 Inspection o Recovery Boilers

RECOVERY BOILERS W. B. A. (Sandy) Sharp SharpConsultant, Columbia, Maryland, U.S.A. TAPPI Kraft Recovery Short Course St. Petersburg, Florida, January 7-10, 2008 OUTLINE Purpose of inspections Inspection methods Scope and frequency of

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5-5 Inspection o Recovery Boilers

RECOVERY BOILERS W. B. A. (Sandy) Sharp SharpConsultant, Columbia, Maryland, U.S.A. TAPPI Kraft Recovery Short Course St. Petersburg, Florida, January 7-10, 2008 OUTLINE Purpose of inspections Inspection methods Scope and frequency of

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ANALYSIS OF CRACKING OF CO-EXTRUDED INTRODUCTION RECOVERY BOILER FLOOR TUBES …

affecting co-extruded tubes in kraft recovery boilers has been cracking which originates in the outer, stainless steel layer (1). In many cases, the cracks are located close to, or associated with, membrane or crotch plate welds at air port, smelt spout and other

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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 flow1 L

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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

learn More

ANALYSIS OF CRACKING OF CO-EXTRUDED INTRODUCTION RECOVERY BOILER FLOOR TUBES …

affecting co-extruded tubes in kraft recovery boilers has been cracking which originates in the outer, stainless steel layer (1). In many cases, the cracks are located close to, or associated with, membrane or crotch plate welds at air port, smelt spout and other

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Formation mechanisms of "jellyroll" smelt in kraft recovery boilers

In recovery boiler operation, maintaining a steady flow of molten smelt from smelt spouts is critically important for ensuring a safe operation of the dissolving tank and a steady flow of green liquor. Smelt spout openings need to be periodically cleaned, as they are

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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 a mount of coolin g water entering t he boiler …

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Smelt Spout Failures - And Prevention

2020/1/30 · 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

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OF COMPOSITE TUBE CRACKING IN newer, RECOVERY BOILER …

Black liquor recovery boilers are a critical component in kraft pulp and paper mills, however, they constitute a major source of materials problems. Because of the ever-present potential for an explosion because of a smelt-water reaction, it is critical that the

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WHY DO KRAFT RECOVERY BOILER COMPOSITE FLOOR TUBES …

failure of carbon steel floor tubes. Use of composite tubes on recovery boiler floors was first implemented in Scandinavia around 1978, while the first use in North America occurred in the early 1980s [2,3]. A few years after composite tubes were adopted for use

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Characterizing Smelt Shattering Performance in a Recovery Boiler

Kraft recovery boiler smelt is shattered into droplets by a high pressure steam jet, to improve smelt dissolution, and to minimize the violence of smelt-water interaction in the dissolving tank. A scaled-down experimental apparatus is being used to

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Recovery Furnace - an overview | ScienceDirect Topics

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 …

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