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single owner-operators who sell power to the grid and have a requirement for heat. Spanner Re2 does not sell the units as an “off-the-shelf” commodity but evaluates the application with the client and ensures that there is a fit and that the client will “look after” the system. Clients are not required to have technical expertise and are mostly dedicated to ensure proper feedstock properties and perform some clean-out, typically once a week for a couple of hours. Spanner has concluded a licensing agreement with Borealis Wood Power of Burlington, Ontario who will sell the CHP units in North America. In 2013 Spanner shipped the first unit to Borealis for installation at their facilities in Burlington. http://www.holz-kraft.de/ http://www.borealiswoodpower.com/ Note: During the week of Sept 9/2013, the author visited Spanner warehouse, assembly plant and six operating installations in Bavaria, Germany. Comments are given below: - Site visits included assembly and meeting with company engineers – Spanner is expanding production and expects to achieve manufacturing capability of 1 unit per day sometime in 2013 - The unit operates on wood chips, NOT pellets and not bark or dirty fuel; there is a small screen in the conduit bringing the fuel into the unit feed system which removes fines. The gasifier design and operation is based on having specific fuel properties for moisture and voidage (amount of empty space between fuel particles) in order to generate a consistent producer gas. Too many fines reduce the voidage; too much dirt causes ash problems and pellets change the fuel density in the bed. The latter could probably be overcome by changes in the design but then that design would be limited to pellets - Too many fines and too much moisture causes an increase in tar production - The technology works well because it is operated in a narrow regime of conditions with specific fuel requirement - Spanner does not sell units “off the shelf” as a commodity, each application is evaluated and Spanner ensures that there is a requirement for heat (power is usually sold by the client to a utility at preferred rate; heat value in Germany is based on natural gas price and at time of visit was equivalent to 10 cents per kWh); the client is educated on the monitoring of the unit and especially on the absolute necessity to dry chips to 20% moisture – in one case of a business owned by a married couple, Spanner would not sell the unit to the husband until the wife agreed that it was the right thing to do – Spanner insists on full buy-in from an educated customer - The author visited units operating on farms, sawmill, garden center, woodworking shop, hops processing and drying plant – in each case the owner-operator was interviewed and asked about performance of the system – all were content with system and support from Spanner – one farmer on being asked about his longest shutdown due to equipment failure replied “one day” – most operators keep an eye on the system and check in a couple of times per day, mostly to check on feed system but equipment is mostly unattended – char/ash in heat exchanger has to be cleaned out every couple of weeks and this usually takes less than two hours – at one site the room where the unit is located was a little loud so the operator just flipped a switch and turned it off, everything stopped within 10 seconds, after a 20 minute period he flipped the switch on again and the unit started operating and was back at full capacity within a couple of minutes. - One operator has had to change the IC engine twice in three years. The failures were traced due to faults with the engine itself rather than the application. In any event, for this 12PDF Image | Evaluation of Commercially Available Small Scale Biomass Electrical Generation Technologies Appropriate to the Yukon
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