Re: Biomass Fuel

andrew heggie <news@xxxxxxxxxxxxxxxxxxxx> writes

Wood is controlled under the clean air act! Then plants rated over 300kW(t)
have to be licensed.

I doubt this is a big problem for the utilities.

I don't see which part of the transesterisation process would affect any
sulphur in the oil, the chap I saw doing it only had glycerol as a byproduct
so why would the sulphur go into this rather than the biodiesel?

I'm not sure of the chemistry of the s-containing byproducts. Presumably
they are oil-soluble and might be eructic acids and so on. I posit it as
a possibility, after all the fuel must meet allowed S-levels.

What is the sulphur content of OSR,

Pretty high I would think. All those S-containing amino-acids, should be
vastly lower in the oil.

its minuscule in woodchip (0.034%
according to the Danes and this would be diluted by a factor of six in the
flue stack even if none were in the bottom ash).

If that's so then the S-level should not be a problem for the cellulose
biomasses. Straws, wood based and so on.

There are many reasons for not wanting to burn wood in a power station, it's
an awkward and inconvenient fuel. I deal with one biomass boilerhouse that
has a gas back up and as far as I know it has not fired up on wood this
season and can only guess at the reasons, inconvenience of a delivery
interfering with the cargo deck every 3 days being one.

I'm sure that's true in part, although when you deal in million-ton per
year quantities its not that hard to get super-reliable kit
(eventually). Its just a matter of over-speccing enough.

I thought Didcot have their coal brought in by train from the Bristol area,
it looked pretty difficult to insert wood into the system without trucking
it to the coal dock.

This station got it from australia, he didn't mention how it arrived at
the plant. The biomass was stored close to the coal pile, pre-processed
and then co-loaded onto the coal stream. Full burn was over 500T/hr.

Even then the bulk density of woodchip fouls the system
up, you cannot get the weight in the waggons and worse even at 5% its bulk
reduces the coal feeding equipment's ability to deliver the full thermal
requirement.

Probably, but that's a detail that can be fixed in new plant easily
enough. Not just the density, you have to use 3x the quantity as well.

There's lots of (often expensive) problems with automatically firing
woodchip, clean combustion is not one of them.

I'm not talking about clean combustion, but controlled impurities like
S.

NB The steam leaves the boiler at about 550C (which is impressive).

--
Oz
This post is worth absolutely nothing and is probably fallacious.



.

Relevant Pages

  • Re: Blackcurrants
    ... Blackcurrants, unlike redcurrants, are hungry nitrogen feeders. ... Blackcurrants are grown as a stool bush, the plant is planted lower ... The fruit appears on last years young wood, ... The flowers are frost sensitive. ...
    (uk.rec.gardening)
  • Re: Blackcurrants
    ... Blackcurrants, unlike redcurrants, are hungry nitrogen feeders. ... Blackcurrants are grown as a stool bush, the plant is planted lower ... The fruit appears on last years young wood, ... Revertion and big bud disease are the main issues with blackcurants. ...
    (uk.rec.gardening)
  • Re: An Answer To High Fuel Prices
    ... any impact on food production. ... They've already built a pine tree plant about 50 miles from where I live. ... burned for fuel, usually in the paper mill that processes the rest of the ... dedicated to wood chip. ...
    (rec.outdoors.rv-travel)
  • Re: Deck Cleaning
    ... We have to clean our front porch, ... made with pressure treated deck lumber. ... If you use a washer carefully, with distance and dont Blast wood you ... doesn't destroy the wood fibers like sodium hypochlorite does. ...
    (alt.home.repair)
  • Re: Ping: Brooklyn1 / sheldon
    ... You had some good posts on how to properly and safely clean a regular ... wood board when cutting/grinding meats. ... I used 3 TB bleach in 8 cups of water after washing with soapy water. ... he stated he's stopped using wood and was using ...
    (rec.food.cooking)