2 good ways. I was wondering how but hadn't come up with a way yet. Since the idea is to turn the carbon steel shavings into H2 saturated rust anyways, water shouldn't hurt. But I'll use the cu' weight method as less work, mess unless something better comes along as I'm a whore for any truly good idea based in physics, reality.
Anyone interested in getting on of these going? There are at least 2 methods to make them, the below gas cooling method and the water/steam cooling method. They are not that complicated just tubes with catalyst in them you blow the syn gas made by heating woody biomass up to 1500F.
Cooling is important as the process makes a lot of waste heat and needs to be removed to keep the gas within 10F or so. The tighter you control it, the tighter your product stream will be.
The early Fischer experiments were at atm pressure and produced the higher gasolines like octane, the heavier gases like propane, butane, ect. Higher temps, lighter HC's to methane/NG. All of which are very clean, in demand fuels.
I have too many projects/business in the fire but would help someone who wanted to do this. It a machine that's really needed to switch to the RE future and independent of large energy corps who want to keep us from anything but oil for transportation.