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:

Poppy   Steam Forum  

Power Limitation and High Exhaust Temperature of S

Wednesday, February 15, 2017   By: Osman Ali [2101] 0 Stars
We are operating a large Ammonia Urea Complex in Pakistan. Following are details of Steam Turbine driving Boiler Feed Water pump at our plant.

Type - Single stage impulse with one nozzle ring, one ring of reversing blades and two rows of moving blades
Normal power: 1742KW
RPM:2985

Power requirement of the pump to produce required flow at desired pressure is 1742KW.
API 610 states, “steam turbine drivers shall be sized to deliver continuously 110 percent of the maximum power required for the purchaser’s specified conditions while operating at corresponding speed with specified steam conditions”. Thus it is clear that our turbine is undersized for the application.

Whenever we start the turbine, the pump gives the rated flow at the desired pressure however, after operation of couple of months, the turbine performance starts deteriorating with increase in exhaust temperature and drop in the RPM. Be noted that the turbine inlet steam conditions and exhaust pressure remain same.

Interestingly, when we shutdown the machine and without any maintenance work when it is restarted after 10~12 hrs of cooling, the turbine again starts exhibiting its normal power. Be noted that in past, turbine was overhauled many times, however its exhibits the same behavior.

I request the forum to comment on following

1- Clearly there is no power margin available in the turbine to operate the boiler feed water pump why the turbine exhibits normal power every time in the start up and after couple of months its performance deteriorates?
2- We strongly suspect that this inconsistency in turbine performance is due to overloading. Please comment.

Post a Reply...
Viewed 1516 times

Saturday, February 18, 2017   By: Jim Watts [764] 5 Stars
This is typically what happens when water soluble solids from the boiler are carried over to the turbine.
The blades foul and lose efficience causing power drop and high exhaust temperature.
After shutting down and cooling the start up steam condenses on the blades and causes a blade wash during starting.
The turbine then works properly again until the fouling returns and the cycle is repeated.

Check your drum water levels and boiler water TDS and phosphate levels


Post a Reply...
Viewed 1138 times

Saturday, February 18, 2017   By: Jim Watts [764] 5 Stars
PS Your boiler Feed pump only requires the 10 percent above maximum power for temporary overload and your existing turbine should be able to do this.

Post a Reply...
Viewed 1171 times

Published on steamforum.com

 

Featured
Is Cp/Cv applicable to steam to calculate?
By: Kent mayhew [2161]

The reason that isobaric Cp heat capacity is greater than isometric Cv is that isobaric involves expansion. Remember our atmosphere has mass, so in order for a system to expand it must displace that mass. And this requires work. So Cp requires work plus the energy to heat the gas , while Cv only requires the energy to heat.

So for all gases and/or steam the work required to expand a given volume is the same that being the work required to displace our atmosphere by a given volume.

Hence t....   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.

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 ABB Power Transformers that ABB is a major transformer manufacturer throughout the world. ABB power transformers are built and designed to meet the individual customer's needs. This experienced attendance to details lies behind the success of ABB's transformers. This approach is carried throughout the manufacturing process: design, core, winding, drying, tank, quality assurance, assembly, testing, transport and installation and support. 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.

Your advertisement impressions are genuine with removal of bots, crawls or spiders in your impression count, and we take it one step further, for hackers and malicious-padders get excluded when they are identified. 

 

 

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 - Maintenance
 
Industrial Training School - Steel Making Tutorial
 
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