Woodchip consumption

Discussion in 'Renewable Energy' started by woodworm, Apr 29, 2019.

  1. woodworm

    woodworm Member

    Location:
    Thetford Norfolk
    Can anyone give me a rough indication of how much g30 or g50 chip a 500kw woodchip boiler consumes per day/week/month under full load operation please.

    Thanks in advance
     
  2. rollestonpark

    rollestonpark Member

    Location:
    Burton on trent
    I think about 150kg/h for 500 kw at full load, but that will probably be at 15 - 20% moisture. Wetter fuel = higher fuel consumption and heavier etc.
    Someone else might have to confirm.
     
  3. my 90 kw uses between 45 and 209 per day, so between 250kg and a tonne for a 500, roughly
     
  4. T Hectares

    T Hectares Member

    Location:
    Berkshire
    Around 25m3 a week of 25%mc G30...
     
  5. woodworm

    woodworm Member

    Location:
    Thetford Norfolk
    Thank you all. Much appreciated
     
  6. A1an

    A1an Member

    We can be nearly 3tons per day on continuous load in winter. 2tons in summer.
     
  7. woodworm

    woodworm Member

    Location:
    Thetford Norfolk
    Thank you
     
  8. So how many kWh would yours churn out in in 24 hrs using 3t?

    I’ve seen a boiler supplier claim 4200 kWh is achievable from logs @ 20% which I think is a bit rich!?
     
  9. A1an

    A1an Member

    3600kwh with a g30 w25, more would be achievable but at a cost to the boiler.
     
  10. Is that per hour, at the meter?
     
  11. rollestonpark

    rollestonpark Member

    Location:
    Burton on trent
    Our 250kw boiler, in winter, will do 3500 - 4000 kWh in a 24 hour period. Some days 4500 kWh or more.
    But I'd say it working hard at that.
     
    Doing it for the kids likes this.
  12. And using about 1.8t to achieve that?
     
  13. rollestonpark

    rollestonpark Member

    Location:
    Burton on trent
    The fuel I'm on is very dry.
    So it'll be less than that,
    I was using about 5 ton a week in winter when cold.
    But this fuel is about 10% moisture approx
     
  14. Ok thanks.

    I’m still trying to learn what’s actually achievable in real terms how much 1 ton of chip or logs gives at the meter after boiler inefficiencies etc.

    4000+ kWh from a ton of 25% logs seems like a tall order to me even with an ultra efficient system
     
  15. rollestonpark

    rollestonpark Member

    Location:
    Burton on trent
    2 boilers with the same kw, 1 chip other log. The chip is bound to do a lot more output in a 24 hour period.
    Because it can run flat out most of the time.
    The log has to rev up and then die down between fills. Etc
     
  16. Yeah I quite agree.

    The chip boiler will run constantly at say 85% of rated output

    The log boiler will start at 30% then spike at 400% then drop back down.

    Total heat output should be the same though really over a given weight usage
     
  17. A1an

    A1an Member

    Yes. Chips weighed in to hopper, boiler run on continuous load until fuel is finished, output then tallied from meter.
     
  18. Ours gives about 3.6kwh per kilogram, fairly consistently, but the weight used from the boilers computer which is really a volume converted to a weight,
     
  19. That a good output! What would you say you get kWh /t then?
     
  20. Ah the million dollar question, how many m3 / ton if in chip form!?
     

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