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Marc Caluwe from Caluwe Biomass Heating Solutions in MA, US

Posted by Morgan White on April 17, 2014

From: Mies, Timothy A
Sent: Thursday, April 17, 2014 4:54 PM
To: Halverson, Robert; Ben McCall <> ( (; Johnston, Morgan B; Rajagopalan, Nandakishore
Subject: Quick summary and highlights from Marc's visit

Just a quick summary of the discussions that occurred with Marc Caluwe from Caluwe Biomass  Heating Solutions in MA, US.

Heizomat is the manufacturer that Marc is a representative for in the US.  I have several brochures that I can pass along that have details on the product line including the RHK-AK model that Marc recommended.  Key points of interest for this group in selecting / approving a boiler:

  • This unit utilizes a drag chain conveyor across the burn bed to handle / stir the material as it burns until dropping into an automatic ash clean out.
  • We discussed what emissions controls would be needed, and Marc indicated that would be a decision campus would have to address.  Marc will be forwarding a brochure that compares emissions values from several manufacturers in the UK.  Options in order of cost would be a cyclone and then an electrostatic reciprocator.
  • UL certification on this model is pending in approx. May of this year.  Due to the cost of ASME certification, they do not plan on testing to that standard.  Instead, in the US they run the boilers at atmospheric pressure with a vent on top.  In this configuration, a plate heat exchanger would be used between the boiler and a thermal storage tank (they recommend old propane tanks as acceptable).  The boilers when used in EU are rated and run at 2 bar (30psi).  Marc cited National Board Synopsis NB370 ( that farms would be exempt from this requirement to run at atm.,  but universities / state / industry would not be.  It would be nice to get confirmation of this from engineering.
  • The boiler recommended has an infinite turndown ration (VFD on blowers) to 10% and then shuts down.  A hot air ignition system in used for lighting / relighting.
  • When running on MXG, in order to minimize clinker caused by low melting point of ash, a lower operating temperature is required, also requiring an 30% approx. upsize  in the model to get the rated output.  If we want 200Kw, we need to consider stepping up to a 250Kw model.
  • Material handling / storage / feeding was discussed at length, and Marc was going back to Heizomat to get their recommendations for the best system.  Heizomat does not offer a bale processor at this time, but has a bulk bin feed system to collect chopped material to be burned.

Marc indicated that he would provide estimates (hopefully  by Friday noon) on a boiler system including a storage feed system, and also the same system installed in a cargo container, prewired, plumbed, etc.

In addition to the discussions with Mark, Luis Rund presented a very nice plan / rendering of a cargo container size boiler housing that had glass fronts on one half for viewers, and the other half a biomass storage container.  Probably out of our price range at this point, but would make a nice travel display for shows, demos, etc.

I also had a call later in the day from a representative of Biomass Energy Solutions in MO who is a sales rep for Uniconfort  (Italy) and we had very similar discussions on running at atmospheric pressures.  More literature is coming, and Jared Findley with BES forwarded some links I had looked at initially for the bale processors used for animal feedlots. 

Let me know if you have any further questions or need clarification on above.