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 commen ts 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 duc t. 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 p aper given at the 1999 IEEE

Conference describing the plant.

Please let me know if this answers your questions.

Best regards,

Jorge PortocarreroDirector of Projects

HUMBOLDT WEDAG, INC.

400 Technology Parkway

Norcross, GA 30062

Phone: 77 0

- 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, J uly 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 l ist 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 differen ce 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. BarnettUSEPA/OAQPS/SPPD/MMG

Mail Code D243

- 02

Research Triangle Park, NC 27711

919

- 541

- 5605

barnett.keith@epa.gov