Last edited by Tolar
Sunday, August 9, 2020 | History

4 edition of Enhanced removal of kraft recovery boiler fireside deposits by thermal shock found in the catalog.

Enhanced removal of kraft recovery boiler fireside deposits by thermal shock

Mark Martinez

Enhanced removal of kraft recovery boiler fireside deposits by thermal shock

by Mark Martinez

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  • 40 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

SeriesCanadian theses = Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches.
ID Numbers
Open LibraryOL19310404M
ISBN 100315567066
OCLC/WorldCa25371714

OCLC Number: Description: pages: illustrations ; 23 cm: Contents: General characteristics of recovery boilers --Black liquor thermal and transport properties --Black liquor droplet formation --Black liquor droplet combustion --Recovery boiler char bed processes --Flow and mixing in kraft recovery boilers --Entrainment and carryover in recovery furnaces --Fume formation and dust. 3. Effect of field strength on recovery boiler ash at °C. 4. Scanning electron micrographs of various recovery boiler ash samples. above the critical value of Ωcm shown in Table I. Interestingly, this sample came from a mill where particulate emissions from its recovery boiler .

on the thermal efficiency of the recovery boiler. The high pressure steam is passed through a steam turbine to generate electricity. Depending on the quality of the steam, and the type/ of the turbine, a t/d kraft pulp mill can generate 25 to 35 MW of electricity by burning t/d black liquor dry solids in its recovery boiler.   Thermal shock leads to many cast iron boiler failures, but boiler manufacturers set operational limits to avoid the cumulative conditions that lead to thermal shock. By following manufacturer’s specifications and scheduling consistent, coordinated servicing, cast iron boiler owners can reduce the risk of thermal shock. The risk of significant downtime and expense A recent study.

To protect the boiler against flue gas condensation and thermal shock, a mixing device should be used to control the load on the boiler. If the temperature of the boiler is below the condensation temperature or the return water temperature suddenly cools down, the mixing device can back off, allowing the boiler loop to come up to temperature.   Thermal Shock. Thermal shock is a phenomenon that can happen when there is a rapid temperature change in the boiler or uneven temperature changes to boiler vessel. Parts of boiler expanding (or contracting) more rapidly than other parts can cause continuous “flexing” of metal components against unyielding parts.


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Enhanced removal of kraft recovery boiler fireside deposits by thermal shock by Mark Martinez Download PDF EPUB FB2

Removal of fireside deposits from the heat transfer tubes in kraft recovery boilers is car ried out by sootblowing and occasionally “c hill-and-blow” practices. During chill-and-blow, black.

The removal of fireside deposits in kraft recovery boilers is a complex problem which involves the interaction between the fluid mechanics of the sootblower jet and the solid mechanics of the deposit. @article{osti_, title = {Kraft recovery boiler physical and chemical processes}, author = {Adams, T N and Frederick, W J and Oregon State Univ., Corvallis, OR}, abstractNote = {The focus of this book is on the recent research into the physical and chemical processes occurring in and around a black liquor recovery boiler.

Almost all of the detailed technical information in this book has. Book "Kraft Recovery Boilers" By T. Adams, W. Frederic, T. Grace, M. Hupa, K. Iisa, A. Jones, H. Tran Page 6 of 16, The development of the recovery boiler by Tomlinson in conjunction with Babcock & Wilcox in the early s led to the predominance of the kraft process.

Fig. shows a typical recovery boiler design, while Fig. compares two types of boilers with widespread use. Fig. shows a recovery boiler building at a brown paper mill.

The purpose of the recovery boiler is to recover the. The recovered chemicals flow out of the bottom of the boiler fireside and are converted into green liquor.

The module describes the operation and components of the fireside of the kraft recovery. The accumulation of ash particles from the recovery boiler lower furnace on the convection sections of the boiler is inevitable.

Sootblowers are commonly used to control the fireside deposit accumulation in recovery boilers. The type of sootblower typically used in a recovery boiler. In kraft pulp mills, the spent pulping liquor is concentrated and used as fuel in the recovery boiler. Extensive deposits are formed in the upper section of the boiler due to the very high ash content of the fuel and the volatile nature of the ash.

Deposits are composed of Na2SO4, Na2CO3, NaCl, some potassium salts and reduced sulphur compounds. deposits, how they form, grow and ultimately plug the flue gas passages in different regions in the boiler, then discusses the possible preventiv e measures for each type of plugging.

A more comprehensive discussion on this subject is available in Chapter 9 of the book, "Kraft Recovery Boilers", by Adams et al [1].

DEPOSIT FORMATION. Regular inspection for evidence of corrosion, particularly in the windbox area of Kraft recovery boilers, is recommended because of the potential for an explosion caused by a tube leak.

The potential for stress-induced corrosion can be reduced if the following factors are minimized: stresses developed in the boiler components, the number of. Black liquor has been used as a boiler fuel for many years in the Kraft paper industry. It contains a significant amount of combustible material, along with sodium salts.

Black liquor burning can produce relatively adherent, low bulk density sodium sulfate deposits on recovery boiler convective surfaces.

In order to maintain the uninterrupted operation of the recovery boiler, sootblowers are installed at strategic locations on the boiler to help remove fireside deposits and prevent the flue gas. superheater region of the recovery boiler when oxidizing conditions prevail.

Blue coloration is thus more likely to be observed in boilers operating at a reduced firing load with a high excess O2 target. BACKGROUND Fireside deposits form massively on heat transfer tube surfaces in kraft recovery boilers due to the high ash content.

The book also covers fundamental chemical and mechanical engineering principles that bear directly on black liquor and recovery boilers. It contains information about typical values and the normal range of important variables, plus many example calculations, data tables and charts of relevant material properties or constants and conversion factors.

The purpose of an electrostatic precipitator, or ESP, is to remove particulate matter, or ash, from combustion discharge gases.

This module describes the purpose, components, function, and safety guidelines of a precipitator. Kraft Recovery Boilers - Fireside. View Course. Kraft Recovery Boilers.

@article{osti_, title = {Water blowing of fireside deposits in coal-fired: Utility boilers: Final report}, author = {Kuchner, R.A.

and Lee, D.R. and Wesley, D.A.}, abstractNote = {The conclusions derived from the results of the laboratory test, field test and analytical effort were: (1) Furnace-wall tubes constructed of SA T2 (low-chromium alloy) will live much longer when subjected.

used in boiler operations, the boilers capacity and the dry solids content have been increasing and their negative effects have been ,worksstudyingNO X emissions[23],fume Fig. Kraft recovery boiler; detailed view from a pulp and a paper mill.

Source: Flávio Paolielio [6]. Additionally, a common cause of thermal shock is a system that incorporates outdoor reset with 3-way valves while the boiler maintains temperature. The boiler is set at ° F, but based on outdoor temperature the system may require only ° F. (60° F. outside air). deposit hardening and tube fouling in recovery boilers were examined.

Results of this work suggest that S02 have some effect on dust sintering rates, in the temperature range between °C. In this temperature range. however, thermal sintering becomes a more dominant mechanism by which dust particles bind together and become hard.

Pratima Bajpai, in Biermann's Handbook of Pulp and Paper (Third Edition), Prevention of Corrosion in Boilers During Shutdown. When power boilers are shut down, water may condense on the fireside surfaces if the temperature of these surfaces falls below the dew point.

Sulfur deposits may react with this water to form very acidic solutions that can quickly corrode the tubes. piping and tube failure. Implementing a boiler feed system can reduce the need for certain chemical treatments, and by preheating boiler feedwater, will also reduce the effects of thermal shock to the boiler.

Treating your boiler feed water will ensure longer .The problem of thermally induced stress cycling (loosely referred to as thermal shock) has been apparent for many years, particularly in boilers installed in hot-water heating systems.

The term "shock" suggests a sudden impact type failure, which in the vast majority of .The convective elements of boilers fired by municipal industrial or other waste materials are often referred to as heat recovery boilers although, apart from their geometry, they are more akin to the rear end of a furnace-fired boiler.

Perhaps the most common heat recovery boiler is now the gas turbine heat recovery boiler.