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Icenhour, Melissa K.

From: Neuffer.Bill@epamail.epa.gov

Sent: Thursday, September 16, 2010 11:16 AM

To: Frank.Nathan@epamail.epa.gov; Icenhour, Melissa K.

Subject: Fw: NSPS - Nitric Acid - SCR Performance

Bill Neuffer

Metals and Minerals Group

Office of Air Quality Planning and Standards (D 243-02) US Environmental Protection Agency 

Research Triangle Park, NC 27711

Phone - 919-541-5435

Fax - 919 - 541-3207

E-mail - neuffer.bill@epa.gov

Office Location: 109 TW Alexander Drive RTP, NC (D 231C)

Overnight mail address:

US EPA

Mail Code D243-02

109 TW Alexander Drive

RTP, NC 27709

----- Forwarded by Bill Neuffer/RTP/USEPA/US on 09/16/2010 11:16 AM

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 |Bill Neuffer/RTP/USEPA/US 

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 |jeremy.richard@pcsnitrogen.com 

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 |09/16/2010 11:15 AM 

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 |NSPS - Nitric Acid - SCR Performance 

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Jeremy,

Thanks for talking with me today. We discussed the reasons for the difference in the 

NOx emissions levels for Units 3 and 5 (1.8 and

0.2 lb/T) -both SCR controlled.

Below is a summary of the call. Please review. If you can supply additional 

information; please provide.

Unit 3 is a modified plant (increasing HNO3 from 55 to 65% that had extended 

absorption. SCR was added in 2007. The unit initially began operation in 1978. The SCR is 

low pressure - that is located after the expander.

Unit 5 is a new line that began operation in 1999. The plant has a total yearly NOx 

emission limit so in order to comply, the SCR is run to achieved very low NOx. Also, this 

SCR is a high pressure unit - that is the SCR is located before the expander. As the unit is 

high pressure, very good mixing(ammonia andthe flue gas occurs.

Thanks

Bill Neuffer

Metals and Minerals Group

Office of Air Quality Planning and Standards (D 243-02) US Environmental Protection Agency 

Research Triangle Park, NC 27711

Phone - 919-541-5435

Fax - 919 - 541-3207

E-mail - neuffer.bill@epa.gov

Office Location: 109 TW Alexander Drive RTP, NC (D 231C)

Overnight mail address:

US EPA

Mail Code D243-02

109 TW Alexander Drive

RTP, NC 27709