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RE: Fuel Blending

Title: RE: Fuel Blending


The use of waste solvent for fuel is possible but you need to address both the technical and regulatory issues.  Many countries provide hazardous waste treatment exemptions for the use of a waste solvent as fuel but you may still be required to comply with all handling, storage, and reporting requirements.  The method of how you handle the solvent may also determine which regulations you fall under.

For example, solvents emitted as a vapor and then condensed, are typically handled as a hazardous waste.  Storage of this solvent prior to use as fuel may also fall under hazardous waste storage regulation.  If the vapors are not condensed, but are sent directly to the oxidizer for combustion, then this process typically falls under air quality control regulation.

As for technical issues, can liquids be injected into your oxidizer?  It is unlikely if your oxidizer was not designed for dual fuel (i.e., natural gas or fuel oil).  Burner modification along with steam injection (to ensure atomization) may be required. Potential problems include an increase in hydrocarbon, soot, and particulate emissions.  If your solvent contains halogenated compounds, then you have to consider acid attack/corrosion, dioxin formation, and the need for an exhaust scrubber.  The oxidizer/burner manufacturer should be contacted for consultation on these issues.

If your solvent is relatively clean, then a wiped film evaporator can be used to volatize the solvent so that in can be fed to the oxidizer as a vapor.  The nonvolatile portion would be emitted from the evaporator as a sludge and require disposal as a hazardous waste.  A double drum dryer may be used to handle dirty or viscous solvents.  Any system you use will have to be 100% explosion proof.  Others on the listserver may be familiar with other technologies/approaches.


Mike Callahan, PE
Principal Chemical Engineer
Jacobs Engineering Group Inc.
1111 S. Arroyo Parkway
Pasadena CA 91105
(626) 568-7005


-----Original Message-----
From: Christovoru.Nicolaus@upm-kymmene.com
Sent: Wednesday, July 17, 2002 12:16 PM
To: p2tech@great-lakes.net
Subject: Fuel Blending

Hi all,

My supervisor is thinking about substituting the natural gas to our waste
solvent (in liquid form), since they produce high BTU, for our oxidizer. I
would like to know if you guys know anything about the process. If you
could share your experience regarding the issue, that would be great.

   What kind of equipment does it require?
   Is it doable?
   Who produces it?
   How the process would look like?
   It will reduce gas consumption, however, how about the VOC emission?
   I know cement kiln uses fuel blending, how does it work?

Thanks, Chris

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