* lambda=1.05 at peak power

** lambda measured with Bosch LSU4 wideband oxygen sensor and [VEMS v3 controller] from exhaust gas O2 content

** 1.05 is used for for low CO. Lambda near 1.00 or 1.01 would raise CO ppm considerably.

** Unlike natural gas, wood-gas (with low tar content) likes high compression without knocking. We use max 15 (compression ratio, max volume/min volume) but [TS] uses up to 19 (yes, nineteen) with near-stoich lambda.

** we use lambdatarget=1.2 at low power. 1.2 to 1.25 definitely burns well, but with reduced peak power (we do not know the exact part-load efficiency numbers, efficiency difference between 1.05 and 1.2 lambda is small)

* where are you located ?

* electric power rating needed ?

* fuel

** fuel size

** fuel moisture content (dry base)

* if a naturally aspirated spark-ignition genset is available, all parameters are required

** compression ratio

** displacement, cyl arrangement

** make, model

** it is not guaranteed that it is feasible (and cuts project investment), but chances are good if naturally aspirated

** if genset is turbocharged, we don't recommend using it (it is not impossible though if a very experienced local turbo-engine expert takes the challange and responsibility to install the safety pressure-relief valve(s) and tune it)

As of 2011-09 the 4-stage gasifier base system totals 2940 EUR /kW in EU (230/400V 50Hz) for 45kWe (predrier + reactor + filtering system + genset with accessories and automation)

* it does not include the moving-floor fuel-container (or other suitable fuel-container, typically for 3-7 days max-load that is kWe rating * 1.2kg/kWhe * 72 hours) normally made in-place, but includes 2kW hydraulic supply for it.

* electricity is required (4kW) to start the plant. Diesel or LPG genset is OK (but not included in the price).

* minimum system is 30 kWe (slightly higher per kW cost than the 45 kW). Bigger plants costs less (per kW).

* we currently do not have any plants in planning stage above 500kWe but bigger plants are feasible

* wheat straw is planned for 2012 August

** wheat straw has low ash-melting point that causes problems with many types of devices. According to our tests - in complience with Viking tests in Denmark - (ours with manual feed, as our automatic straw plug-feeder is not ready yet and only feasible for ID > 630mm reactor) these multi-stage gasifiers are not prone to slagging. The char-content prevents ash-fusion at the top of the reactor bed and when the char burns out, temps is lower than 850C and no channeling.

* most of our experiments used woodchips as fuel, maize tests (4 cm pieces) are carried out 2011 October.

** For ID>630mm reactors (90kWe) it is safe to assume that maize will work. ID=450 mm ... we don't know yet. Bridging is more likely to be a problem than ash-fusion.

We are completing the system (including CE paperwork) with experienced technology partners (who can make even an Imbert type reactor operate reliably, at least with wood-chips) and will make advertisement soon.