The past few times I have started up the charcoal Gasifier I have struggled to get a flare off before starting the engine , sure there was gas there, but remove the torch and it would not stay lit ,also the flare had that orange colour to it when trying to burn , the engine was also a lot harder to start both times , unlike the first 2 runs I did on this stainless steel pipe with the slots in it , my first thoughts were an air leak .
So yesterday I tried blowing through the system and as I always do I spray with soapy water every joint and everywhere else that I have welded up or bolted together , Nothing ,no leaking air bubbles or anything at all .
So I decided it could only be the nozzle that may be the cause ,so laying the gasifier down on its side I opened up the large hatch and started removing charcoal out of it , around the nozzle area crumbly slag or clinkers starting started appearing in the charcoal I was removing , but as always just breaks away in my hand , I then get to the stainless steel pipe and remove it and was pleased to see that it looks almost the same as when I installed it last week , be it a little dirtier though .
So I started scraping away the remaining bits of slag /clinkers off the pipe , funny thing though , I could not scrape off the stuff towards the far end on the right of the picture , yet it looked the same as what was around the slots and that just chipped off with a screw diver blade , so a larger blade was used and I started chipping away at it and noticed it was starting to come out white underneath , meaning that the far end that is plugged up with refractory cement and well away from the slots must have ,melted through the stainless and down to the ceramic , how strange !
Anyway that will have to be investigated a little more I think , and I am positive that isn’t the cause of why no flare off or easy engine start , I think the heat transfer from this stainless steel pipe onto the fitting on the side of the tank is so great that the wall of the gasifier got extremely hot in only 5 mins of starting the fan and lighting it and that maybe the expansion of my hatch when hot is allowing air in , because all the charcoal around the hatch has a white dust on it and I am sure I read somewhere that is a sign of air leaking .
By the way I normaly always use a ceramic holder of some sorts to hold my nozzles and that is what insulate the side of the tank from the extreme heat of the nozzle so maybe I shall cast a stainless steel pipe into refractory as I do with the tig nozzles and give it another try .