Melanie

– See the e

‐ mail below from Emitec, a MECA member, per your request for info on retrofitting C3

marine engines with DOCs. (FYI, I’ve edited Sri’s response a bit.)

Sorry for the delay in getting this to you.

Hope this helps.

Antonio

From: Srikanth.Reddy@EMITEC.COM [ mailto:Srikanth.Reddy@EMITEC.COM ]

Sent: Thursday, June 07, 2012 9:59 AM

To: Antonio Santos

Cc: Ulrich Pfahl Subject: Experience retrofitting la rge marine engines with DOCs 

### FW: Experience retrofitting large marine engines with DOCs

Antonio Santos

to: Melanie King

06/15/2012 03:34 PM

Hide Details From: Antonio Santos <asantos@meca.org>

To: Melanie King/RTP/USEPA/US@EPA

History: This message has been replied to. Page 1 of 3

10/3/2012 file://C:\Documents and Settin g s\mkin g 04\Local Settin g s\Tem p \notes87944B\~web2993.h

...Hello Mr. Santos,

1) Does Emitec have any experienc e with retrofitting Category 3 marine diesel engines with DOCs?

I'm not aware of any activities which Emitec was directly invo lved in with Category 3 marine diesel engines for retrofit applications. I ha ve put the question out to my colleagues in Europe. If I find out something different. I will inform you. Typically, DOC's will work wit h fuels with lower sulfur levels. Ty pically, the large sh ips burn distillate fuels which are high in sulfur. The use of a DOC in a high sulfur in fuel environment can increase Particulate matter by Sulfate formation.

2) If so, "if the engines typically on ly operated at lower loads (25-50%), would you expect there to be problems with catalyst fouling due to additional partially un burned hydrocarbon’s passing into the exhaust stream?"

The issue of face plugging (unburned hydrocarbons) has been one of Emitec's stre ngths. Face plugging is a concern for ceramic substrates. Face plugging is mitiga ted by having a low cell density substrate. Ceramic substrates require thic k walls to have low cell densities to maintain structural int egrity. However, with metallic substrates, you are able to get both low cell density and low cell wall thickness. This is a real advantage for Emitec which several of the large engine manufacturers are taking advantage of. Locomotive manufacturers have gone with Emitec substrates for this reason, among others. However, with the distillate fuel being used, I'm not sure if face plugging is an issue especially at the operating conditions which you describe. With ULSD these problems are likely not to occur above than 200°C.

3) Are you aware of other companies (MECA members or non-MECA members) who have retrofitted DOCs on these types of engines?

I'm not aware of any companies which have done DOC re trofit of Category 3 marine engines. I have asked this question to our colleagues in Germany. Again, if I ge t a response back regarding this I will let you know. However, there is some retrofitting going on for NOx reduction using Vandia based SC R technology. It is an SCR only system, no DOC. Agai n the high sulfur distillate fu el is the primary issue.

Sincerely,

Sri

Dr. Srikanth Reddy
Senior Application Engineer

Emitec Inc.

3943 Hamlin Rd.

Rochester Hills, MI 48309

(248) 276-6440 (work)

(309) 585-5533 (cell)

Srikanth.Reddy@emitec.com

Web address: http://emitec.com 

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