How Deaerators Work (Engineering)
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Published 2019-10-28
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Learn how deaerators work! This 3D animated video introduces the spray and tray type deaerators. You will learn all of a deaerator’s main components, its typical operating conditions, different designs and how it works.
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▶️Introduction
Deaerators are required to remove dissolved gasses from the boiler feedwater system. The two gasses removed are primarily oxygen and carbon dioxide. It is necessary to remove these gasses as a failure to do so may lead to corrosion of boiler components.
Deaerators are classified as un-fired pressure vessels, although they often operate at very low pressures e.g. 0.5 bar / 7.5 psi, 105 C / 130 F respectively.
Deaerators mechanically remove entrained non-condensable gases by raising the temperature of the water to its saturation point. The solubility of the gases reduces as the temperature increases, so the level of entrained gases reduces as the temperature increases. A deaerator is essentially a pressurised feed water tank, although non-pressurised (atmospheric) tanks can be used for smaller steam systems.
High levels of oxygen will lead to corrosion of boiler parts, which may lead to failure of the boiler. Typical problems associated with high dissolved oxygen levels include flaking of the water side boiler surfaces and oxygen pitting (deep holes in the metal surfaces).
High levels of dissolved carbon dioxide leads to a lower pH, which will make the boiler feedwater acidic. Low pH water causes corrosion of the carbon steel parts of the boiler and steam system components.
Two common deaerator designs are used in the engineering world, these are the spray type, and tray type. Both deaerator designs require a large contact surface area between the water and steam, in order to aid heat transfer. The steam heats the water to its boiling point, or very close to it.
Condensate from the steam system is returned to the deaerator and make-up water is fed into the deaerator. Chemical treatment also occurs in the deaerator; typically an oxygen scavenger is injected into the deaerator to remove the final traces of oxygen. Bicarbonate and amine-type chemicals are used to control the boiler water pH, they are usually injected with the make-up water or between the deaerator and boiler.
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All Comments (21)
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Want to continue learning about engineering with videos like this one? Then visit: courses.savree.com/ Want to teach/instruct with the 3D models shown in this video? Then visit: savree.com/en
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Having been a power station operator for 36 years (recently retired) I can say that this is the most comprehensive and easily understood piece I have ever seen explaining the function of a deaerator. . Well done!
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"orifice" is a well engineered, uniform design, calculated and dynamic hole... not just any hole. An orifice costs upwards of 30x or more what you can charge for a hole. Remember to bill appropriately. "Drilled 3/8'ths hole, deburred: $5.95" "Excavated a precision 9.525mm smoothed and chamfered orifice in location of best effect: $174.00 + $8 tool wear."
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We are now 3 hours deep into your videos, and I must say these are incredibly well explained the details in your videos are phenomenal. Subscribed with all notifications on. Keep up the great work!
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This is an essential video for any engineers that are just starting to work in a power industry. Good job sir!
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This was probably the best explanation video Ive ever seen. Amazing job, thank you!
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Holy molly! Your voice and the way you explain are definitely clear, infomative and scientific. Honestly, I've had to watch at least 3, 4 videos or more to discover any engineering topic, but this video is the exception - Only this is enough! Respect and thank you!
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Definitely the best tutorial I have ever watched. I like the way you introduce knowledge which is clear and detailed.
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Highly appreciate your efforts....nothing like this on you tube except yours I think colleges should start to use your videos to explain students.....new era of teaching
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Recently I've been told to do reserch on deaerstors at university But non of the web-sites I've saw gave me so much understanding of this theme as this video Thank you so much for this video and all of the effords you put in it.
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I wish I was taught in this way in college. Excellent teaching. God bless you.
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What an excellent and comprehensive explanation of this vital equipment, thank you so much!
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I am an engineering student, and I just wanna say this channel is AWESOME
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best ever tutorial..will recommend this to my friends..thanks!!
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Thank you very much for sharing. The second type with scrubber tend to create more vibration.
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This is an excellent explanation of a deaerator vessel...thank you sir...
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...VERY informative to a non-engineering person, and VERY clearly explained! I shall click 'subscribed' now.
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By far the best explanation I have ever come across! Thank you very much, sir. You've got one more subscriber here.
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Got clear understanding, thanks for the explanation & illustration!
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Jon, I want to thank you for all your efforts. I use a number of the videos you have made as instructional aids in our apprenticeship courses for our Boilermakers and our Thermal Systems Engineers at California Boiler, Inc. Excellent resource!
