I am taking delivery of a 300,000Kcal/hour gasifier next month. I am having difficulty finding anyone that can suggest a gas burner which will work for this unit. The gas pressure is 12-16inches WC, the gas is in the neighbourhood of 1000Kcal/cubic metre. I am told by gas burner manufacturers that the 'average' gas burner will not work with this system as the energy/unit volume is too low. The manufacturer of the gasifier says it will work with most traditional burners.
We want to burn the full flow of gas into a sawdust/wood chip dryer as a 'hot' gas (unfiltered/uncooled) so that we can benefit from and dispose of the tars created.
Does anyone have any suggestions on a burner for this application?
I'd think twice about your gasifier vendor. Typical woodgas has about 1/10 the BTU per standard cubic foot of gas as propane. I'm no combustion expert by any stretch but as I see it, they have small orifices for the fuel and large holes for the combustion air. With woodgas I'd think you'd need almost as much fuel supply as combustion air.
I take this from data related to running an internal combustion engine on woodgas. The general rule of thumb is 1:1 woodgas:combustion air. Rather than use a venturi in a carb to create a vacuum to suck in a little fuel in with a lot of air, woodgas has such low BTU numbers as to require mixing the fuel gas and combustion air in separate plenum.
Also, the Univ. of Minn. at Morris is running a high pressure boiler on woodgas. They use a large duct with a high volume of fuel gas to a similarly large combustion air supply. Can't remember the ratio, though.
I have asked the manufacturer for the size of the gas output pipe. With such low pressure and fairly high output I am assuming it is pretty large. I have seen this gasifier burning in commercial applications, but the burners would never pass health and safety standards in North America. Most applications I saw involved a really basic pipe style burner where the air mixture was manually adjusted. That would be OK as long as we had flame detection and safety shutoffs.
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