PEER-REVIEWED CORROSION & MATERIALS Smelt spout …

ABSTRACT: Molten smelt normally flows smoothly down the smelt spout of a recovery boiler like water, but at times it suddenly becomes sluggish and forms a viscous blob on the spout trough that partially or completely blocks the smelt flow. This form of smelt is commonly referred to as "jellyroll" smelt.

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Characterizing Smelt Shattering in Recovery Boilers

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 and contacting

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

1/7/1997 · @article{osti_631170, title = {Composite tube cracking in kraft recovery boilers: A state-of-the-art review}, author = {Singbeil, D L and Prescott, R and Keiser, J R and Swindeman, R W}, abstractNote = {Beginning in the mid-1960s, increasing energy costs in Finland and Sweden made energy recovery more critical to the cost-effective operation of a kraft pulp mill.

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4-4 Recovery Boiler Chemical Principles - TAPPI

Engineered to address the most dangerous task in recovery boiler maintenance, the SpoutRunner system automates the rodding of smelt for the safety of pulp and paper mill personnel. Simple to operate, it consists of a hinged pneumatic drive that, when activated, uses gravity and pneumatic force to travel up and down the spout with a custom-designed cleaning head that safely and reliably clears the smelt away.

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Smelt Spout Failures - And Prevention

Failure of Smelt Spouts in Kraft Recovery Boilers. Doug Singbeil, Joey Kish Jim Keiser (ORNL) Nov 14, 2014. Pulp and Paper Corrosion Symposium. Failure of Smelt Spouts in Kraft Recovery Boilers. 2© 2013 FPInnovations. All rights reserved. Copying and redistribution prohibited. ® FPInnovations, its marks and logos are trademarks of FPInnovations.

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(PDF) CORROSION AND CRACKING IN RECOVERY BOILERS | …

Tran, "Recovery boiler corrosion", Effect of H2O on Acidic Sulfate Corrosion in Chapter 10 (pp.285 – 322) in Kraft Recovery Kraft Recovery Boilers," p. 421-426 in Boilers…

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4-4 Recovery Boiler Chemical Principles - TAPPI

4.4-1 RECOVERY BOILER CHEMICAL PRINCIPLES Mikko Hupa Åbo Akademi University Department of Chemical Engineering SF-20520 Turku, Finland 1. INTRODUCTION A black liquor recovery boiler has two main functions. On one hand, it generates steam

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US7806127B2 - Smelt spout enclosure for chemical recovery boilers …

An enclosure for a smelt spout of a chemical recovery boiler comprises a skirt having a central region through which smelt flowing from the smelt spout falls into a dissolving tank. The central region is defined by a wall and has a trough disposed around its perimeter.

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Black Liquor Recovery Boilers - An Introduction

Black Liquor Recovery Boilers - An Introduction David Parrish Factory Mutual Research Corp. Winter 1998 Category: Operations to a level of several inches before flowing out water-cooled smelt spouts to the smelt dissolving tank. It is the pool of molten - 980

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5-5 Inspection o Recovery Boilers

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

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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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Recovery boiler history and future

Recovery boiler history and future Esa K. Vakkilainen, Lappeenranta University of Technology, P.O. Box. 20, FI-53581 Lappeenranta, Finland INTRODUCTION Recovery boilers are built all over the world. The roots of recovery technology are longer than the roots of

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Characterizing Smelt Shattering in Recovery Boilers

The kraft recovery processes [1] have many different operations, some of which are considered very dangerous and require in-depth understanding. Smelt shattering, amongst these processes, is the focus of this thesis. This chapter discusses the kraft recovery

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Smelt Spouts - Babcock & Wilcox

30/1/2020 · 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

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Smelt Spout Failures - And Prevention

30/1/2020 · 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

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UTILIZATION OF VISUAL ANALYSIS IN RECOVERY BOILERS

Keywords: Recovery boiler, visual analysis, black liquor, char bed, smelt flow, carryover The aim of this thesis was to study potential of visual analysis in recovery boilers. Performance of recovery boilers is measured with traditional ways, which are measurements

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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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The Fluidity of Recovery Boiler Smelt, 2004 International Chemical Recovery …

The fluidity of smelt is an important property that affects smelt flow from recovery boiler spouts. It is strongly related to smelt viscosity. Results of a laboratory study show that molten smelt has a viscosity between 2.5 and 5 cP, and that, as long as smelt is completely molten, its viscosity is not affected appreciably by composition or temperature.

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Recovery Boiler - an overview | ScienceDirect Topics

Because of the possible adverse reaction of molten smelt with water, all recovery boilers have an emergency shutdown procedure in the event of trouble! The recovery boiler is the largest, single, most expensive piece of equipment in a kraft mill costing over $100 million; hence, in many mills the recovery boiler limits the maximum production.

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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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