session 1 module 2 - boiler construction.pdf
Post on 06-Jul-2018
226 Views
Preview:
TRANSCRIPT
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 1/21
Boiler Construction, Pressure
Parts & Drum Internals
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 2/21
Mittwoch, 4. September
2013
Fußzeilentext 2
Objectives and other details of modules
Duration – 75 minutes
Training aids
Power point Presentations
Reading Material
Objective
At the end of the session par ticipants wi ll be able to :
Describe essential parts of boi ler and their functions
List out design cri teria of various pressure parts and furnace, materialof construction
Detail out of steam separation principles drum and its funct ion
contraction details of boiler drum
Distinguish between boilers for subcri tical and supercritical units
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 3/21
Boiler Construction
9/4/2013 Steag O&M Company 3
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 4/21
Pressure Parts arrangement
9/4/2013 Steag O&M Company 4
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 5/21
Furnace design aspects
9/4/2013 Steag O&M Company 5
This closeness in size reflects the fact that acoal-fired unit has to be designed to preventexcessive slagging, whereas an oil-fired unit has
to take into account, as a primary sizing factor,its furnace tube-wall integrity
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 6/21
Furnace Design Considerations
9/4/2013 Steag O&M Company 6
Important design considerations for the proper sizing of the furnace include
Net-heat-input-to-plan-area (NHI/PA) release rate. As the rank of coal decreases, furnacesincrease in plan area and vertical height from the top fuel nozzle to the furnace arch.The NHI/PAs range from (1.6 x 109 J/hr-929 cm2) for severe slagging coals,through (2.2 x 109 J/hr-929 cm2) for low slagging coals
Distance from the upper fuel nozzle level to the furnace exit. Sufficient furnace dimensions,
including adequate height between the top row of burners and the furnace exit, must beused to obtain the proper retention time for the combustion.
Furnace exit gas temperature (FEGT). Sufficient waterwall heat transfer surface is necessaryto allow sufficient cooling of the combustion gas so that the fly ash is solidified before itenters the first pendant tube bank.
This will minimize deposition and fouling of the pendant tube banks.
The velocity of the flue gas must not exceed specified limits in order to control erosion fromthe ash in the coal. Depending on the ash analysis and quantity, the velocity is generallylimited to (18.3 to 21.3 m/s).
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 7/21
Furnace Sizing
9/4/2013 Steag O&M Company 7
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 8/21
500MW construction details
9/4/2013 8
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 9/21
Boiler materials Consideration
9/4/2013 Steag O&M Company 9
The primary consideration in material choice is a function of expected tube temperatureof operation.
Economizers and water wall sections are usually constructed with a mild or mediumcarbon steel, whereas
low alloy ferritic steels are used for most super heater and re heater sections,with austenitic stainless steels specified for the highest-temperature circuits or corrosionperformance.
Alloys for use as boiler tube materials in the United States are identified by an ASMEdesignation (SA-xxx) or an essentially equivalent
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 10/21
Materials for Boiler
9/4/2013 Steag O&M Company 10
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 11/21
Boiler drum and steam separation
9/4/2013 Steag O&M Company 11
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 12/21
Steam Generation
9/4/2013 Steag O&M Company 12
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 13/21
Steam Generation
9/4/2013 Steag O&M Company 13
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 14/21
Steam Separation
9/4/2013 Steag O&M Company 14
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 15/21
Boiler steam water schemes
9/4/2013 Steag O&M Company 15
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 16/21
Heat Transfer in a pipe
9/4/2013 Steag O&M Company 16
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 17/21
Common Circulation systems
9/4/2013 Steag O&M Company 17
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 18/21
Boiler Drum and internals
9/4/2013 Steag O&M Company 18
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 19/21
Drum design cri teria
9/4/2013 Steag O&M Company 19
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 20/21
Steam Drum
9/4/2013 Steag O&M Company 20
8/17/2019 Session 1 module 2 - Boiler Construction.pdf
http://slidepdf.com/reader/full/session-1-module-2-boiler-constructionpdf 21/21
Steam Drum and separators
9/4/2013 Steag O&M Company 21
top related