Water-tube Boilers _ International site for Spirax Sarco

Water-tube Boilers _ International site for Spirax Sarco -...

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International site for Spirax Sarco Tel : (800) 575-0394 Fax : (803) 714-2222 InsideSalesLeads@Spirax.com http://www.SpiraxSarco.com/us/ You are here: Home Resources Steam Engineering Tutorials The Boiler House Water-tube Boilers Description of water tube boilers including operation, types and benefits; also, a brief synopsis on how they are applied to combined heat and power generation. Use the quick links below to take you to the main sections of this tutorial: The printable version of this page has now been replaced by The Steam and Condensate Loop Book View the complete collection of Steam Engineering Tutorials Water-tube Boilers Fig. 3.3.1 Water-tube boiler Water-tube boilers differ from shell type boilers in that the water is circulated inside the tubes, with the heat source surrounding them. Referring back to the equation for hoop stress (Equation 3.2.1), it is easy to see that because the tube diameter is significantly smaller, much higher pressures can be tolerated for the same stress. Water-tube boilers are used in power station applications that require: A high steam output (up to 500 kg/s). High pressure steam (up to 160 bar). Superheated steam (up to 550°C). However, water-tube boilers are also manufactured in sizes to compete with shell boilers. Small water-tube boilers may be manufactured and assembled into a single unit, just like packaged shell boilers, whereas large units are usually manufactured in sections for assembly on site. Many water-tube boilers operate on the principle of natural water circulation (also known as 'thermosiphoning'). This is a subject that is worth covering before looking at the different types of water-tube boilers that are available. Figure 3.3.2 helps to explain this principle: The Boiler House Introduction Shell Boilers Water-tube Boilers Miscellaneous Boiler Types, Economisers and Superheaters Boiler Ratings Boiler Efficiency and Combustion Boiler Fittings and Mountings Steam Headers and Off-takes Water Treatment, Storage and Blowdown for Steam Boilers Water for the Boiler The Feedtank and Feedwater Conditioning Controlling TDS in the Boiler Water Heat Recovery from Boiler Blowdown (TDS control only) Bottom Blowdown Water Levels in Steam Boilers Methods of Detecting Water Level in Steam Boilers Automatic Level Control Systems Water Level Alarms Installation of Level Controls Testing Requirements in the Boiler House Pressurised Deaerators Steam Accumulators Related Content Steam Tables A comprehensive set of steam tables is available here. Home
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This note was uploaded on 03/19/2012 for the course ECON 256 taught by Professor Lopez during the Spring '10 term at École Normale Supérieure.

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Water-tube Boilers _ International site for Spirax Sarco -...

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