De-Rating Vs Turn down the boiler to less than 20% MCR
De-Rating Vs Turn down the boiler to less than 20% MCR
(OP)
Hi,
We have foster wheeler water tube boiler operating pressure at 450psig with steam production of 250,000Lb/Hr. This boiler can only operate at a minimum of 20%MCR, i.e. 50,000Lb/Hr per the OEM. I was wondering if someone has converted these huge boilers to operate up to 10% MCR, i.e. 25,000Lb/Hr as we have no steam demand left. I understand bringing the pressure down will create other issues like higher steam velocities and may overwhelm the separators but not sure for such a huge size boiler. Is there anyone who has done this successfully and if yes, what is required to be done by keeping in mind that the circulation ratios are not affected and avoid the carry over as well. We may also have to look into the burner design to make sure we stay compliant from emissions stand point like NOX, CO etc. If anyone has any information or advice, please share.
We have foster wheeler water tube boiler operating pressure at 450psig with steam production of 250,000Lb/Hr. This boiler can only operate at a minimum of 20%MCR, i.e. 50,000Lb/Hr per the OEM. I was wondering if someone has converted these huge boilers to operate up to 10% MCR, i.e. 25,000Lb/Hr as we have no steam demand left. I understand bringing the pressure down will create other issues like higher steam velocities and may overwhelm the separators but not sure for such a huge size boiler. Is there anyone who has done this successfully and if yes, what is required to be done by keeping in mind that the circulation ratios are not affected and avoid the carry over as well. We may also have to look into the burner design to make sure we stay compliant from emissions stand point like NOX, CO etc. If anyone has any information or advice, please share.





RE: De-Rating Vs Turn down the boiler to less than 20% MCR
RE: De-Rating Vs Turn down the boiler to less than 20% MCR
We are also looking into purchasing the smaller once through boiler and looking at the cost Vs converting the existing boiler to run at lower MCR.
RE: De-Rating Vs Turn down the boiler to less than 20% MCR
RE: De-Rating Vs Turn down the boiler to less than 20% MCR
We are going to talk to one of the company in our area and hoping that they have some experience without jeopardizing the circulation ratios on the water side but if any one have converted the huge boiler like that to low turndown and have any thing to share, please do so.
Thanking you all.
RE: De-Rating Vs Turn down the boiler to less than 20% MCR
So basically in order to be able to re-start a CC gas turbine power plant? someone has decided to use a boiler sized at 25 times the required capacity??
Why?
I can't see any boiler being able to do that level of turndown.
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RE: De-Rating Vs Turn down the boiler to less than 20% MCR