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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: The '''first internal combustion engines were fueled by town-gas'''. Which can be made from coal, wood (chips, or small cubes), or even waste. Not even complex to make! '''Keywords:''' * producer gas * syngas * woodgas * holzver-gasser * downdraft gasifier '''Overview''' '''V3 and round firmware''' was modified to '''control mixture via PWM-solenoid''' (there is also a manual valve so the PWM-valve need not be too big even for bigger engines) to reach lambda-target * under testing; expected release late 2010-03. In v3 the PID-boost can be configured for lambda-target instead of MAP-target **in the unlikely case that boostcontrol is also needed, alternate boost is still available for boostcontrol Other (simple) features like "time-relay" for the ash-removal screw or shaker (often windscreen-wiper motor) could be useful. ---- '''We built severak FEMA-type downdraft gasifiers and collected experience.''' In short, the zones in the '''FEMA-tarmaker''' wander up and down, cooling the oxydation zone and creating a HUGE amount of tar (which is somewhat like mineral oil: good in some places, but not good when sticking the intake valve to its seat). '''The best gasifier design for 2-200 kWe lets air in tangentially, swirling in a toroid at a certain location, keeping temperature up and tar-forming down''': http://www.ideje.hu/images/Energy/WoodGasifier/Ford/Ford.jpg http://www.ideje.hu/images/Energy/WoodGasifier/Ford/Ford_sizing.jpg ---- '''Why ?''' For farmers, to '''use the sunflower seed''' (in oil form) '''as heat-engine fuel''' (for '''tractors, water-pumping, grinding, heat-pump, generate electricity or other shaft-power''') '''is suboptimal'''. They have the stalk, straw and weed. The intelligent and environment-friendly choice is to use these growing (CO2 neutral) fuel instead of depending on fossile. A 100 kW genset generates appr. '''400 EUR / day electricity PLUS 400 EUR / day heat''' (partially warm water, partially exhaust that can be used for absorption heat pump also: for even higher heating value). '''Appr fuel cost is 200 EUR / day''' when purchased (only appr 130 EUR for many farmers that have the straw anyway, just need to feed it to the gasifier). ROI (return of investment) could be ~ 1 year or lower. ---- '''Combined cycle''' - brainstorming There are several choices. * gasification + spark ignition 4-stroke engine ** very cheap engines. New, or in junkyards. Also cost-efficient to maintain * gasification + Ericsson cycle (regenerated or recuperated) gas turbine or piston engine '''probably the BEST cycle!''' ** unfortunately the hot piston is expensive (the turbine even more expensive). But gasification + spark ignition 4-stroke engine + (Ericsson OR beta-Stirling) can be a relatively cost-efficient IGCC (integrated gasification combined cycle) * direct burning + rankine cycle: steam engine or steam turbine or ORC (organic ranking cycle) * a combination of the above. ---- '''Links, videos''' More links and images [http://www.eleg.hu/tiki/tiki-index.php?page=FaG%C3%A1zos%C3%ADt%C3%B3 here] (Hungarian. We will continue in English here) [http://www.ideje.hu/images/Energy/WoodGasifier/ video] ---- '''Other trivial improvements and dropped plans''' * obvious improvement (in any gasifier): better heat-exchange between the incoming air and the wood-gas output, like gekgasifier.com ** or a simple but efficient long (6m or longer) tube-in-tube counterflow heat exchanger * temporarily dropped: one that is a big hole underground (covered) with pipes for primary and secondary air-in, gas-out, steam in. A big, corrosion resistant heat-exchanger (condensating for Nx10kW) cools output gas (warming the house at the same time) ** the target is to try the multiphase technology that was used for blue water-gas production (gas rich in Hydrogen, multiple times the heating value of continuous wood-gas). This might be an exteremely cheap and efficient way to reclaim heat with a "rotating" regenerator, otherwise wasted from Otto engines or gas turbines (or other powerplants with high waste-heat temperature, not steam-Rankine cycle of course!), making fuel consumption better temporarily dropped: using the wood-gas in radial-compressor gas turbines and MembersPage/MarcellGal/DetonationCycleGasTurbine (way too loud) ---- Use the VEMS Round to '''control the clean air feed "throttle" of a gasifier in order to improve the output''' * vacuum accumulator * PWM valve ** the VW 2 pin valve with 7.8 Ohm resistance seems to "prell" (using 18-21 Hz, but other freq also when it moves at all). * pneumatic solenoid valve * vacuum actuator ** Marcell found several in the junkyard. eg BMW had near the manifold in several 6 cyl engines around 1990. ** most cars have flaps in the cabin-heating / air conditioning system actuated by vacuum valves ** audi (and other VW consortium) vehicles have pneumatic door-lock. These do not seem good, because designed for on/off operation Stepper would be nice. Unfortunately round does not have enough outputs to control 4 wire stepper. ---- We have a v3 with blue LCD inside - mounted on a standalone 1.6L 4 cyl engine. The LCD equipped genboard v3 looks very cool TODO: photo, video 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.