No announcement yet.


  • Filter
  • Time
  • Show
Clear All
new posts

  • Afterburners

    Can anyone tell me who would install a diedrich afterburner? Is it HVAC folks?

  • #2
    Re: Afterburners

    Where are you located? You will need a type B certified gas fitter. Greg Clubb is Diedrichs AU agent.


    • #3
      Re: Afterburners

      Howdy, just found this great forum! I saw an old 2008 post from cuppacoffee about a low energy, low emission, non-gas fired solution to an afterburner. I have a used Diedrich IR-7 which I am preparing to install in my Chicago cafe. I have been in business for 18 years now and am now diving head first into the roasting end of the business, mostly to supply myself, as well as to control quality and quantity, and to add to the shop ambiance. I found a used Diedrich 12 afterburner for sale on EBay for $10K, but I dont want to pay that kind of money for a gas hog. Any ideas? Any experience on dealing with this issue would be much appreciated please! Thanks much!



      • #4
        Re: Afterburners

        Hello Mason and welcome to CS.

        I wont reply to your pm, as my reply here should suffice and hopefully assist others with a similar dilemma.

        Apart from afterburners, or to use a more correct term, thermal oxidiser, Ive researched a number of alternative options to manage smoke and odour, namely, catalytic oxidisation, water scrubbers, charcoal, and woven mesh screen systems suppemented with ozonizers.

        All the sytems are expensive, if not measured by initial outlay, then certainly by running costs and ongoing servicing.

        Whilst no expert, from what Ive researched and as a result of the many, many discussions Ive had with roaster suppliers, companies that supply these alternative solutions, and other coffee roasters, it is my opinion the afterburner (thermal oxidiser) remains the most efficient means of reducing or eliminating smoke and odour produced by coffee roasting.  There is also comfort in the fact that the system has a long heritage in our industry, and I am able to be more predictive when it comes to running costs.

        Just some food for thought:

        For a small, perhaps less than 100-200kg per week, coffee roasting business, an entirely different approach to the problem of energy costs and pollution has been invented. A couple of engineers, Nick Ciavarella and John Winter, in Newcastle, Australia have designed and created what appears to be  world first...a carbon neutral roaster that saves on 90% of gas consumption.  In addtion, the roasters combustion is said to be so efficient that there are negligible smoke, odour, carbon monoxide and nitrous oxide emissions.  Google "Nick Ciavarella coffee" and you will be able to find them as well as further information.



        • #5
          Re: Afterburners

          Welcome to CS Mason.

          I am intrigued by your comment, words to the effect that you have extensive experience as a professional cafe owner, and are about to "...dive head first into..... roasting.... to control quality...."  Unless you also have extensive experience roasting coffee on commercial equipment, I am afraid the resulting roasted coffee supply will be quite inconsistent and of questionable quality for a miriad of reasons. Its a big ask for a roasting rookie to try and supply an existing, busy commercial enterprise (cafe). It may be different if the roasting and cafe business were growing together.....

          WRT afterburners. My understanding is in order fior them to be able to do the job intended, they need to be designed and built for the roasting plant at hand. Otherwise, they may not actually do the job intended, and be quite inefficient while trying.

          To my mind, the ONLY courses of action open to someone wanting to go into this professionally, are to:
          a) approach the manufacturer of your roasting plant and seek advice, OR
          b) approach an engineer who specialises in the design and build of such, and seek a quotation for a design and build to suit your existing plant.

          Bear in mind if later on you either modify (thereby changing the existing design set up), or replace the existing roasting plant with another, the after burner may also require replacing at the same time to suit the new equipment.

          And of course the more inefficient (poor design, not suited to application etc) an afterburner is, the more of a gas hog it could be. So it would probably pay to spend more on a specific design and build suitable for your roaster in the first instance, to properly deal with your emissions, to leave a smaller carbon foot print, to pay a smaller monthly gas account long term......

          Hope that helps.

          very first CS site sponsor


          • #6
            Re: Afterburners

            If anyone needs an afterburner we design and build them for most types of roasting applications.

            They can actually save you in maintenance costs, reduce flue fire risks and improve the consistency of equipment airflow as well as the obvious of treating VOCs, Odour and particle matter not collected in the cyclone. The gas cost per kg of coffee is low if designed and calibrated right.