openspaceman
-
Posts
9,947 -
Joined
-
Last visited
-
Days Won
5
Content Type
Profiles
Forums
Classifieds
Tip Site Directory
Blogs
Articles
News
Arborist Reviews
Arbtalk Knot Guide
Gallery
Store
Freelancers directory
Everything posted by openspaceman
-
If it was plastic string it will have melted into various places, including the sprocket nose bearing.
-
I thought I had answered that question but I note no answer to my Thursday question. The rate of charring is very dependent on initial mc.
-
Thanks to spud's link to the secondhand coil and flywheel I have it running with the coil. It cuts well but takes a while to slow down to tickover once the throttle is released, any suggestions. First I will check if the butterfly is snapping shut but I wonder about an air leak. I have a short video: VID-20250206-WA0000.mp4 - Google Drive DRIVE.GOOGLE.COM which I will leave up for a little while
-
Bar Recommendation after totalling my Tsumura
openspaceman replied to Whoppa Choppa's topic in Chainsaws
Yes I can see that and presumably it is a bit harder so should wear less?? -
Bar Recommendation after totalling my Tsumura
openspaceman replied to Whoppa Choppa's topic in Chainsaws
That's a bit brittle, I have bent a bar through 90° but never broke one -
So many variables, species?, Top height?, average dbh?. Stacking whole trees to chip for biomass ,on site, in future can be fraught with difficulties as well as roadside space. It also needs a decent volume to justify the machinery. Firewood works in lots as low as 20m3 if an 8wheeler and crane collects.
- 1 reply
-
- 1
-
-
I prefer the term pyrolysis offgas for what evolves from slow pyrolysis. To me syngas is specifically a mixture of carbon monoxide and hydrogen that is produced by the gasification ( 0.2 stoichiometric air) of carbon (coke). I am not a chemist and I was too stupid to learn chemistry at school, my brother was though and top of his field in carbon. As to extended cooking; I expect once a retort has reached 450°C no matter how long you kept at that temperature not much would change. It's complicated by the feedstock but if the temperature uniformly ramps up to ~300°C the endothermy of drying and torrefying is over, then there is a short exothermic stage when the pyrolysis continues up to 440°C. After this the carbon matrix begins to change, whilst pyrolysis and cracking witin the matrix continues, and this is likely endothermic.
-
No need for arguments, I'm happy to explain my understanding but not getting involved with bickering.
-
It is not gasification and no oxygen is added as in gasification. If you consider that instead of wood being a complex mixture of cellulose, hemicellulose, lignin and trace compounds you simplify it to a compound of elements in the ratio C:H1.4:O0.6 then when you add energy they disociate and reform as true gases H2 CO CH4 , I haven't accessible text or inclination to work out the proportions but there is little C left over.
-
With slow pyrolysis as you heat it beyond about 450°C , when the charcoal is about 25% of the dry weight of the original wood, more tars are volatilised, these contain carbon, hydrogen and oxygen, until you reach a point at above1000°C when less than 15% of the weight of the original wood remains the char is almost pure carbon and ~10% ash. Fast pyrolysis, where a wood particle is subjected to a temperature rise of more than 1000°C in a second, converts nearly all of the wood to gases and ash.
-
So the thermocouple measures the temperature at the top outside of the retort?
-
I doubt it would all be that thin and how thick is new underground duct pipe? Anyway I always prefer to re use rather then buy new if it's cheap.
-
Shame you are 600 miles away, I'd buy some for underground conduit for the 300V DC cables from my shed 50ft to the house.
-
Thanks for that, I misremembered but knew 400mm came in to it
-
Once the population is displaced, dispersed or eradicated there is only one nation that will settle it and create tourist resorts.
-
You need to check part J of the building regs, I thought you were only allowed 400mm of single wall above a stove.
-
I'm in a low rainfall area and for most of my working life I had an uncovered stack about 5ft high and two or three logs deep. Most of the logs remained dryish but then it was not at all unusual to see blue smoke from the chimney, Now with a modern stove I don't see smoke after start up because my logs are under cover and mostly well under 20% mc.
-
I have a starter pulley that has a hex drill adapter for stihl. It's not a good idea to drive off the flywheel nut because when you stop the drill the inertia of the flywheel undoes the nut. I found that out long ago when flywheels had woodruff keys you could replace.
-
Thanks spud, I'll give it a whirl and let you know
-
An update; it looks like I did the owner a disservice by fitting an aftermarket coil. I was preparing to check the timing with a strobe as per @bmp01's suggestion and waited for dusk. I did some test pulls and found it sparked well three times then nothing, next pull nothing. Left for an hour and same again. The owner, a chap that was at primary school with me, can no longer handle a chainsaw . I have put it back on the shelf as , although it is still a nice saw, the £130 for a genuine part isn't justified as I already have far too many saws and I suspect a carburation problem too. I may well decide to get it going in the future, either with a new coil or a secondhand one.
-
Crikey if that's your first one I'm impressed, I see about half of them
-
You said hardwood but I didn't notice species. Oak was always best presented at stump down to about 10" QG unless you know your stuff and can cream off planking butts, at 100 year old there would be precious few big enough. In my day the white woods sold in multipes of 7ft . Once you are into the tops I guess firewood is the market, 8ft seems to be the preferred length though biomass chip may prefer 3 metres. On such a small area there is likely to be only a few hundred tonnes and a tractor-trailer with crane will be economic but if the ground is poor and the produce not perishable wait until the ground gets a bit firmer.
-
Like most legumes not a pleasant smelling smoke
-
bottom right is robinia
-
I will take the flywheel off but agree it is probably the coil. The frustrating thing is at work we had a box of broken 026 where i could find bits as the were replaced by ms261.
