Poppy and the Steam Forum and Power Forum

Welcome to the steam and power forum, a bulletin board dedicated to questions and answers to Steam Plants and Power Generation Plants for steam boilers, turbine generator and heating problems. Dedicated to power plants, power generation, supercritical, and heating plants as well as steam boilers, steam turbine generators, gas turbines or combustion turbines, hrsg, steam heating, pressure vessels, steam line, including ASME questions and more. Remember the forum is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
 
The Steam Forum and Power Forum is being sponsored by the following:
Industrial Training School - Main Distant Learning
 

Poppy   Steam Forum  

Deaerator pressurization

Wednesday, February 07, 2018   By: pradeep [1918] 2 Stars
Dear All
I want to know that why deaerator is pressurized. In my plant it is pressurized to 2.5 kg/cm2. what will happen if we pressurize it to 1.5 kg/cm2. Please give your inputs
Regards
Pradeep

Post a Reply...
Viewed 270 times

Thursday, February 08, 2018   By: Basem Belal [2194] 1 Stars
the needs of pressure in De-aerator mean we need heating in it up to wanted temperature, this mean pressure of 2.5 bar gives 138 dC and 1.5 bar gives 127dC, so the needs of heating causes the needs of pressure.
of course feed tank with its De-aerator has to work as heat ex-changer in the series of heat ex-changers, for this reason its water temperature must be more than previous heater and less than next heater, so it is calculated then it gives you the required pressure.

Post a Reply...
Viewed 242 times

Thursday, February 08, 2018   By: cmolanes@itba.edu.ar [50] 4 Stars
Mr. Pradeep:

I am sure you realize that the deareator must be pressurized so that the separated air and non condensable gases may exit the system by themselves without needing some sort of ejectors or vacuum pumps as is the case in condensers what Mr Belal has stated is a most sensible warning in order that you check the whole chain of preheaters to avid unbalancing it in case you need to change the working pressure of the deaerator.

Claudio Molanes

Post a Reply...
Viewed 231 times

Saturday, February 10, 2018   By: Jim Watts [764] 5 Stars
Dearation of the water in a dearator requires two functions to be carried out.
1 The water must be brought to boiling point which causes dissolved gas to be released.
2 The released gas must be scrubbed away from the water or its pressure will increase and redissolve.

This can be arranged at any pressure and is often carried out at a changing pressure in steam supplied from turbine bled steam which changes with load.

Boiling the water is the simplest function by mixing steam.
Scrubbing is more complicated and is the trick you have to worry about.

The dearator steam used to heat the water is also the steam that carries out the scrubbing and must be minimum flow ratio with the water flow. It is this fact that sets the dearator pressure because the steam flow is dependent on the feed water temperature. If the feed water is too hot the dearator will not need much steam to reach boiling and the scrubber will not work.
A dearator needs around 25 degrees difference between feed and saturation temperature.

As your dearator is at 2.5 Kg/cm2 it is above the pressure selected to simplify venting and must be higher due to high feed temperature. If its not you can reduce pressure .

Post a Reply...
Viewed 218 times

Saturday, February 10, 2018   By: Abu Monzur [2229] 0 Stars
Amount of air that can be dissolved in water - decreases with temperature and increases with pressure. So, pressurizing deaerator for eliminating dissolved air is counter-intuitive. Therefore, the reasoning should be in thermodynamic heat-balance and NPSH calculation of the Boiler Feed Pumps.

Post a Reply...
Viewed 216 times

Monday, February 12, 2018   By: Jim Watts [764] 5 Stars
The NPSH of Dearator water for any and every pressure is always zero 0.0

Post a Reply...
Viewed 211 times

Published on steamforum.com

 

Featured
superheated steam ideal gas
By: cmolanes@itba.edu.ar [50]

Mr. Pradeep:

Steam behaves well as an ideal gas if not too close to the saturation line if you place yourself on a Mollier chart, when the temperature and enthalpy lines coincide and are straight, horizontal lines, then it behaves as ideal, and this you can easily see on the chart.

I would rely though most on the steam values given by the chart or steam tables, because they are confident independently of the region , e.g. they stand both for ideal and real gas, but the ideal gas equation ....   Read All
Advertising Info - Click Here!

It's hard not to look at this ad at least once, then you go to the next page an notice it again. Maybe you will not read the message, but you will be thinking about the brand and we call that brand impressions.

About 2/3 of internet traffic is useless traffic and consist of malicous-bad-robots.  However, there are good robots too.  We block bad-robots, and allow the good one's through, but we just do not count the good one's.  We want good straight-brand impressions for our advertisers!

Imagine your static or animated display advertisement placed here, and if that is not enough you can include text too to expound on the virtues of your services and or products.    In addition, you can benefit by using our new advertisement feature to have your video included in your ad space.  Wow, make an infomerical with text and a display by combining all features to enhance the readers or audience's experience using your brand.  Ads can be much more than a static display ad. Here is an example of how your video could be used or position in this ad space:

 

Caption: This public domain video shows from Nationawide Boiler and they are the first to provide a 1000-BHP trailer mobile rental unit using a Superior Boiler.  The author of the video is not an advertiser and is being used to show how the video ad can be of value to the reader since you have already being viewing the video.  It is hard not to think about the authors brand after viewing the video ad.  This is the benefit of Branding.

 

 

 

A Long-Game that Earns Tomorrow's Sales


Click on this Promotional Advertisement to Contact Us Today!

Good Branding Puts Your Brand or Company in the Front of a Decision-Maker’s Mind for a Purchase either Months from Now or Five-Years in the Future.

Good branding makes your brand or company the leader in a crowded field of other brands or companies vying for your potential or existing client's attention. 

An invitation to the buyer's table to negotiate potential sales from $thousands to $millions of dollars in any of these: Systems sale, Capital Equipment, Upgrades & Modifications,  Repairs, or Capital Project becomes easier now with a recognized brand that thinks forward by brand advertising.

Your advertising will cost you an unbelievable low amount, so ask for our Media Kit that has Specs and Rates. 

Below is some of our demographic data for steam and power forum users will speak for itself:

Bus Sector Percent   Education Percent
Manufacturing 11%   College 51%
Power Gen 20%   Grad School 20%
Chemical & Petroleum 15%      
Medical Facilities 6%      
Pulp & Paper / Forest 7%      
Pharmaceutical 7%      

Our network works hard for you with placements for full coverage on part of the network, or full network placement.  Brand yourself today and don’t miss-out on being invited to your client or future client's table because they forgot you.  Be the leader they will remember and be part of their capital project.  Tomorrow’s clients are your future.

 

Advertising and Marketing Agency for the steam and power forum
PE Marketing, LLC

Branding.jpg

Sponsors/Advertisers
Industrial Training School
 
Industrial Training School - Maintenance
 
Industrial Training School
 
National Assoc of Stationary Operating Engineers
 
Confidentiality, Disclaimer; Policy
STEAM and POWER FORUM
© 2001 to Steam Forum, All Rights Reserved.
PE Marketing LLC is representing the steamforum for advertising and marketing
Valid XHTML 1.0 Transitional