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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: '''Three-stage co-current gasifier''' separates the pyrolysis, combustion and gasification (reduction) steps. If all goes well, the result is low-tar gas (20-200 mg / Nm3). '''Overview''' Unlike the classical Imberts in the 1940's or FEMA (tar-makers), this type of reactor can output clean producer gas, but requires automatization with pressure sensors and high-temperature thermocouple sensors. ---- '''Operation modes''' This laboratory gasifier has 4 modes of operation. 3 good, and 1 bad (which gives tarry gas, unavoidable during warmup). http://vems.hu/producergas/images/ThreeStageGasifier/ThreeStageReactor_test_6346_m.jpg Notes: * The air must be preheated. Optimally min 400C or rather 500C. (using the exhaust heat and/or the producer gas heat in production). * this test-reactor is too small for straw, because straw bridges easily ** on the good side, slagging was not a problem even when operating on 100% straw. http://vems.hu/producergas/images/ThreeStageGasifier/Three-Phase-Gasifier_lightningport_airinput_6318_m.jpg At this occasion (not always!), the middle-burner burns even with 15C air input. http://vems.hu/producergas/images/ThreeStageGasifier/MiddleBurnerBurningWith20Cair_6341_m.jpg ---- '''Practical size''' * '''50-1000 kWe''' (200 - 3500 kWth) '''is a practical size for now''' (and multiple reactors can always run in parallel) ** 50 kWe appr 4-5 months (~ 2000 EUR / kWe inside Hungary) ** 250 kWe or bigger (~ 1800 EUR / kWe inside Hungary) on 6-8 months notice. * the smaller 4-20 kWe seems more problematic, eg. more prone to fuel-flow "bridging" problems. ** We hope to deploy at least one 12 kWe test unit for evaluation on a friendly farm in 2011 summer, to collect fuel-bridging and fuel-tolerance experience. ** We do not expect as problem-free operation (or near as good return-of-investment) as with the 50kWe and bigger units. * even smaller 2-4 kWe size is beyond aims for now, but not impossible in far-future Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.