The World is going smokeless. As most people, use biomass, for cooking and heat, it is a challenge to provide inexpensive, fuel, and efficient stoves, with chimneys.
Smoke is created by incomplete burning. Most gases have a small window of air/gas mixture where it will burn. any impurities or poorly mixed gasses will create smoke.
Temperature is also a factor in incomplete burning (smoke). The hotter you burn a substance, the more likely you will burn the impurities. The addition of forced air will raise the temperature of the fire and ensure a clean burn.
For safety, a double walled insulated chimney should be a standard everywhere, .
As for non-renewables, Propane's large range of air to gas mixture ensures a near complete burn.
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Perfection is a subjective and abstract concept.
Best way to continue utilizing Biomass is to pyrolyze it, not burn/combust it...essentially it is a form of "baking" down the biomass to release gases and generate steam to create electricity/power. Since this is one of the simplest, oldest forms of energy generation, it should be easy to scale to smaller applications. I have been involved in the R&D of this for application to Municipal Solid Waste, industrial waste, etc. and it is possible to scale and skid mount/make mobile this type of energy generator, which produces clean energy and utilizes the renewable resources of any hydrocarbon refuse man generates.... The remaining char residue can recarbonize soil which is a far superior method for regenerating soil to nitrification or man-made mineral fertilizers.
Manufacturing smokeless solid fuel from clean dry (8% mc) sawdust, is what I am working on .With a central hole in the Briquette, we produce a "Venturi" effect and get a total burn, as the inside of our briquette, burns at a greater temperature than the outside.Today I started working with a microwave dryer, which processes wet biomass into dry biomass, very quickly. The World is changing...
I would like to know more about your microwave dryer as I am working with a firm that is commercializing the pyrolysis of laminate packaging to reclaim the aluminum and hydrocarbons; challenge is that some of the laminate feedstock will have residual moisture post consumer use and we need to dry it prior to pyrolyzing--are you able to share any details as to your process/who mfrs it/ is it commercially available or potentially replicatable? Thanks