I have had some problems, some sucsesses with the project, some euphoria and quite some cursing but it seems its all folowing the learning curve well.
This is all that can be seen from the outside. Note cleanout door.
The grate fromabove
Stainless nozzles got a slight brown colour on them otherwise they seem intact. I took a lot of effort to weld them on the firebox well for a good thermal contact so that the preheat air cooled firetube can pull heat from the nozzles. Otherwise l am sure they wuld be gone by now. Looking trughthe heatexchanger, the firetube wall around the nozzles glows red showing the heat sink effect.
I have been useing damp charcoal as fuel. Not soaking wet just moist enough it doesent dust when crushing it. A WAG of 15 - 20% water. Anyway, this is a fantastic way of making realy rich gas without any fuss of driping and metering water in. No risk of freezeing. Dust free! Hands are clean after handling this fuel!
Problem. Steam does come in the hearthand gets reduced as water boils from the char above the glow zone. But it does litle to cool the part in front of the nozzles, where reaction tempering is most neaded. Thats why there is dusty ash in the ashbin (shows optimal hearth temperature) and drops of slag forming at nozzle tips.
This means l will most likely inject a bit of water still in the heatex. Shuld allso improve gas quality.
I experimented using unscreened char, stright from the chrusher. Works for 100km then the firetube content starts looking like this.
Nope. Perhaps it might work for highway driving but mixed driving pluged it shut. Or it shuld be frequently grate-shaked but thats not practical either becouse of small ashbin.
Note the slag droplet in the char.
There was so much dust in fact l neaded to rinse the cooler/tubing too. The system barely produced enough gas to run at idle yesterday! Cleaned the gasifier, filter and tubing and it purrs rock solid again.