Bill Bianchi wrote:Dirty, tar-laden producer gas is made by heating a container full of gasifyable material in a limited oxygen environment. The material is baked in the same way charcoal makers bake wood. I'm pretty sure this dirty producer gas can be cleaned up by running it through a bed of hot charcoal after it comes out, after which it should be clean enough to go through a filter, cooler, then to the engine.
How much charcoal is required to crack the tar molecules? Can the gas from a large chamber be run through a gallon container of hot charcoal and come out clean, 5 gallon container, 10? What's the minimum?
Bill Bianchi wrote:Producer gas burns differently than gas. The engine needs to be adjusted to run on PG. Would adding HHO (hydrogen) to the fuel intake help the engine's operation on PG in any way? I know it would alter the performance of the engine, but for the better or worse? If for the better, I'd probably power the electrolyzer with a TEG so the engine doesn't have work any harder. (The electrolyzer would not be meant to increase output in any way, just get a more complete burn of the PG and help the engine run. I'm aware the power from the TEG could more efficiently be used to directly charge batteries. This is strictly about engine performance and longevity.)
Bill Bianchi wrote:Storing PG is generally frowned upon because of the volume required for anything useful. However, I'm wondering if routing the PG to a water-seal (upside down barrel inside a water filled, larger barrel) might be useful for refueling the gasifier without shutting down the engine. The engine could continue to run on the PG in the water piston while the gasifier is opened to add more material. It would also help cool the gas, I think. Or maybe the storage container would affect the flow from gasifier to engine in a bad way. Something to consider further, I guess.
Will a few of these water pistons hold enough PG to run an absorption freezer for a day or two, or perhaps a stove for cooking? In theory, PG could run these things, but can enough be stored this way to be practical?
Bill Bianchi wrote:Someone here mentioned storing gas in a bladder set inside a trench with a protective covering over it. Might that store enough PG for useful work? I know earth bags could be used to shore up the walls of a shallow ditch with plastic to help keep water out. Storing PG would allow a person to power something later without having to run the gasifier, or power something over a 24 hour period without running the gasifier the whole time. Also, moisture in the gas tends to condence back to liquid when stored, impurities settle in the liquid, so storing for a day or two may allow for very clean gas even from a less efficient gasifier. If true, perhaps materials other than wood can be gasified, that gas stored until clean, then used. The waste water could be evaporated, the dry stuff Incinerated cleanly later for pollution control.
Bill Bianchi wrote:What constitutes high grade charcoal? I see hardwood mentioned as a prefered material to make charcoal. Is it the material itself that constitutes the quality or the charcoaling process? Can one get high grade charcoal from other materials? Bio briquetting charcoal from grasses and weeds is being done in India right now. Are those charcoal briquettes suitable for a charcoal gasifier, assuming the charcoaling process is done correctly?
Bill Bianchi wrote:I've read that plastic is more energy dense than hardwood by weight. Is this true? I watched someone on YouTube run an engine off gasified plastic. 1 milk jug is supposed to run a small engine on idle for 13 minutes, according to the Walnut Labs outfit that experimented with it. The gas left a parrifin residue in the engine, so the gas needs to be cleaned up so it doesn't do damage. I definitely want to try running that gas up through a bed of charcoal to see if that cleans up the gas. Talk about an abundant, cheap material to gasify.
Bill Bianchi wrote:What would it take to build a DIY fuel cell capable of using producer gas to make electricity? Is this simply beyond our technology level at present?
Bill Bianchi wrote:What about using PG to run a small burner, which heats one side of a TEG? (Thermo Electric Generator) How much PG would need to be stored to accomplish that for 24 hours? I'm thinking of TEG's to charge batteries, here, in a more passive way over time. Also, the producer gas shouldn't have to be quite so pure to run a burner. Efficiency aside, is this possible?