RE: Comments on Portland Cement NSPS

Portocarrero, Jorge 

to:

Keith Barnett

08/03/2009 03:49 PM

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History: This message has been replied to.

Dear Mr. Barnett:

I do not have any comments on your notes of our telephone conversation. 

In 

answer to your questions:

1. There is no difference in the type of equipment required for an 

alkali bypass or a sulfur bypass. Both extract a portion of kiln exhaust 

gases from the riser duct. The difference is in the amount of bypass 

necessary to reduce the problem substance. This affects the size of the 

equipment for handling gases and material.

2. Attached is a list of KHD kilns with bypasses. Our kilns with 

100% 

bypass have been installed primarily in the middle East, none in the U.S. 

Going back to the Santa Cruz Plant, it was originally designed for up to 

100% bypass. It has been modified since it was originally built around 

1979/1980. Attached is the first page of a paper given at the 1999 IEEE 

Conference describing the plant.

Please let me know if this answers your questions.

Best regards,

Jorge Portocarrero
Director of Projects

HUMBOLDT WEDAG, INC.

400 Technology Parkway

Norcross, GA 30062

Phone: 770-810-7345

Fax: 770-810-7343

email: jportocarrero@humboldt-wedag.com

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-----Original Message-----

From: Barnett.Keith@epamail.epa.gov 

[mailto:Barnett.Keith@epamail.epa.gov] 

Sent: Thursday, July 30, 2009 2:33 PM

To: Portocarrero, Jorge

Subject: Comments on Portland Cement NSPS

Dear Mr. Portocarrero:

I have written up a short note of our conversation a few days ago.

Could you review what I wrote and add any corrections? For the list of 

kilns that Humboldt build I added the year based on the PCA plant 

directory. Please note if the dates are correct.

(See attached file: Porto Telecon 7-28-09.doc)

Also, I have two additional questions?

1. Can you explain the difference between a sulfur bypass and an alkali 

bypass?

2. Can you think of any other possible kilns that have the 100 percent 

bypass of kiln gases in the Humboldt comment letter. I spoke with the 

Santa Cruz plant you mentioned and indicated they didn't have 100 percent 

bypass, so I am wondering if you can provide any additional examples.

Thanks for your help.

Keith W. Barnett
USEPA/OAQPS/SPPD/MMG

Mail Code D243-02

Research Triangle Park, NC 27711

919-541-5605

barnett.keith@epa.gov