Author Topic: Biomass - a burning issue  (Read 24434 times)

Andy Simmonds

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Re: Biomass - a burning issue
« Reply #45 on: November 01, 2010, 02:52:35 PM »
Thanks Keith for your post below - will take a proper look through it as soon as possible

This is a relevant piece of news: 600 workers down tools to protest at Gov subsidies for burning wood http://bit.ly/9zEwEU

I would add that any fuel is only secure if it is a) available and b) affordable. How secure wood fuel is/will be will probably vary regionally and locally and follow local land ownership patterns e.g. individual landowners/the national trust should be ok (?). I personally still cannot see how the arguments that justify use of biomass as a fuel locally - can be applied to the use of biomass at a far larger scale nationally. I gather the EU are arguing that biomass fuel emissions (not set against sequestration from regrowing) should be used in calculations of GHG emissions. This implies that SAP factors would be in line for an overhaul if any decision was made to come into line with this. I will try and find out more detail on this. Meanwhile - anyone else who has inside knowledge of EU - feel free to help out....

We have invited CAT and DECC to put forward papers on the subject and hope that CAT will be able to do so.

DECC said: "We are aware of the article, having seen it on the website previously and thank you for drawing it to our attention. There are many articles published on the web or in scientific journals which hold views or provide evidence both for and against biomass and we do not individually comment on any of them. Our role, instead, is to consider the weight of evidence that these articles provide in developing government policy."

It is also worth restating a locally specific interest I have in this debate: I live in a town, well small city (Hereford) and it is not covered by the clean air act, air quality is an issue now, and I really wouldn't support any more wood burners or biomass boilers in the city, for reasons of health. I try to stay open minded to all sides of the argument, but this aspect I can understand 'in my gut' (or rather lungs).
« Last Edit: November 01, 2010, 03:13:25 PM by Andy Simmonds »

PHIL NEWBOLD

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Biomass - a burning issue
« Reply #46 on: November 13, 2010, 09:16:38 AM »
Fantastic debate folks, apart from some political posturing early on. As anyone with a basic knowledge of science knows, burning wood produces an assortment of poisonous substances, many of which led to the the passing of The Clean Air Act. As a boy, I remember walking and coughing my way through the streets of Nottingham in the fifties waving a white handkerchief in front of my parents' Austin 10 so we could get home in fog so thick you barely see the ground. In a simplistic way, I think chopping down trees just to burn them is bonkers, regardless of the pollution it causes. The South Americans are mustard at this habit with the heat generated simply providing a particularly grotesque version of global warming. The scale of what they are doing to their forests in the name of meat-eaters and palm oil consumers everywhere makes the UK biomass issue look like a small bonfire in our back yard. They don't even need Guy Fawkes to justify needlessly filling the skies with smoke

If I can just skip the argument sideways for a moment, I currently live in an old stone house with an open fire. Most winter evenings we start a fire with newspaper and sticks, a small amount of coal and then feed the fire for the rest of the evening with scrap wood from building sites. As a building designer and project manager, I regularly visit building sites and rarely leave without a bootful of timber offcuts that were destined for landfill via the skip. During the summer I can collect enough scrap timber in this way to keep my fire going all winter and sawing it up saves me going to the gym. I never buy wood. I realise that burning the wood (and the paper and coal) is poisoning the atmosphere but I justify it by getting free heat from material that would otherwise be lost to landfill although is this cheating future generations of coal deposits?

Nick Grant

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Gideon Richards

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Re: Biomass - a burning issue
« Reply #48 on: January 07, 2011, 06:23:46 PM »
Response to the AECB Discussion Paper on Biomass – a burning issue.
Firstly, I must point out your sensationalist approach to releasing this paper is inappropriate and sets a tone no better than those you criticise! I am very annoyed and disappointed in the AECB’s approach and am becoming more and more concerned that you’re campaigning, responses to consultations and support for discussion papers like this one are more about pushing your own CarbonLite agenda than having a real debate, or covering your members aspirations.

Have the AECB management panel made any risk assessment of the impacts that this discussion paper has on its members in this sector, or for the debate more broadly.  I suggest you haven’t, which makes me and I’m sure others in the same sector have to question if membership in the AECB is appropriate and if your agenda is now too narrow.

To the discussion paper; there appears to me to be a number of fundamental flaws in your author’s discussion paper and the AECB’s premise.

The authors fall into the trap that they and the inappropriate press release complains about, that of confusing biomass as an energy source, its carbon life cycles and emitter of PM10, PM2.5 and NOx and the issues and impacts they like and don’t like. 

Just because the government don’t bring the standards for energy efficiency to where the AECB would like them to be, or that councils are setting building targets fundamentally lower than required, or that developers are developing heat and building strategies that don’t meet with the ethos of the AECB management, does not mean that well designed biomass systems and fuels are inappropriate! Renewable Energy is used as the default for the 10%+ Merton Style Rule and Biomass is one option.   

You reference CO2 values of 0.46 kg/kWh from a report by Orchard Partners Ltd. without a context to the figures.  Have the values picked been validated and are they comparing apples for apples, or have we a selective set of data.  What validity does this article have?  Is the article Harness this heat an appropriate source?  I would suggest not, on the basis that the Partner’s, (Orchard Partners LTD article for bsjonline.uk)  data was based on ‘CO2 footprints for the energy supply options’ table and is based on CO2 savings from piped heat in a CHP setting. Hardly convincing and not related to what you are discussing!
This same argument can go for resource values quoted.  Who peer reviewed the reference documents and what experiences do they have of biomass and the whole sustainability agenda?  AEA have carried out many reports in the past for government which the biomass industry have fundamentally disagreed with and especially when we look at projected resource issues.

So it appears that the way the authors have argued the case, is to change the boundaries so the argument can be made, not appropriate for a supposed serious piece of work.

They also conveniently miss a number of other critical points in their critique, such as:

•   peak oil , peak gas, peak uranium – these fuels are not capable of being part of a closed loop system, unlike biomass, unless of course you can wait for thousands of years;
•   environmental impacts of further extraction of more difficult and environmentally significant resources;
•   how many new buildings are constructed a year, opposed to how many can be supported by biomass systems currently in the system (200,000 plus New v 25 million Existing);
•   Resource utilisation through good design and clustering (individually installed systems and CHP/ Trigen) should be an integral part of any energy and community energy strategy.  The UK needs an energy strategy that utilises as many different fuel sources as possible in the most effective and efficient way and yes that also includes reducing demand as well;
•   Much of the combustion chip and pellet used are actually residues from the very construction processes they want to promote.
•   You conveniently leave out that there is a substantial amount of wood in the UK standing (1 million odt / 2million green tonnes), that desperately needs managing – see the Forestry Commission’ Woodfuel Strategy, which highlights how much of the UK’s woodland is not in management.
I could go on but these are key examples.  The discussion paper is correct in highlighting resource utilisation as a key concern; however, we have not even scratched the surface of how the UK needs an integrated approach to energy, buildings, planning, consents, supply and demand, so perhaps the debate should be broader than the one you highlight.  But perhaps that doesn’t allow the AECB management the opportunity to pick their hobby horses!
Your discussion paper, I suggest may have prompted discussion and debate, however, I doubt that it has added any value to such an important issue.

I note with interest that you have now toned down your news release section.  What made you do that? A realisation that it was inappropriate!




Nick Grant

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Re: Biomass - a burning issue
« Reply #49 on: January 09, 2011, 07:22:49 PM »
Dear Gideon

Alan and I can respond re technical aspects of the discussion paper.

1."The authors fall into the trap that they and the inappropriate press release complains about, that of confusing biomass as an energy source, its carbon life cycles and emitter of PM10, PM2.5 and NOx and the issues and impacts they like and don’t like. "

Not sure where you think we are confused. We deliberately put aside concerns about emissions other than CO2.

2. Our argument is not about our disillusionment with Government or developer targets for energy efficiency, as you seem to imply. We are not in a huff because the whole world isn't embracing Passivhaus! If biomass really is near zero carbon then it actually makes no sense (in carbon terms) to use carbon intensive electricity to recover heat using MVHR, or to super-insulate using materials with embodied energy. Also lots of North glazing appears to reduce carbon emissions by reducing electricity use for lighting at the expense of supposedly carbon free heat. These are not hypothetical arguments but the result of rational analysis by engineers applying the zero carbon biomass assumption. These are arguments that we have been wrestling with in our daily work and are what drove us to try and clarify our thoughts.

3."So it appears that the way the authors have argued the case, is to change the boundaries so the argument can be made, not appropriate for a supposed serious piece of work. "

One or two other people seem to be suggesting that we simply changed the system boundary currently used as a devious trick to push our agenda when in fact this was the eureka moment for us. Our journey started with this paradox; why waste energy and resources on insulation and fancy glazing if the heat source is almost zero carbon? The obvious answer is that biomass (or PV generated electricity etc) costs money and so it makes sense to not to waste it, as in the days before we worried about carbon. However the economic level of efficiency judged in terms of say simple payback is not going to deliver particularly high levels of efficiency. This would not be a problem if our energy source is genuinely low carbon and in unlimited supply.

We then thought about the fact that biomass is a limited resource so if we burn it then someone else can't and so has to use a
high carbon fuel. At this point we still assumed that biomass is net zero carbon. At some point we were discussing biodiesel made from waste oil and how far it would be reasonable to drive to get this. It seems obvious to us now that the thing to do is to put any such biofuel into the nation's diesel pool either literally or at least mathematically. This means that our own Hummer goes from being zero carbon to serious carbon emitter but the effect on the worlds's CO2 emissions is the same or slightly better if we put it into the pool (economies of scale and we don't drive 30 miles to fill our tank).

I think the car analogy is easier to grasp but the principle is the same for buildings and identical if we consider heating with biodiesel of biogas. This is what led to us questioning the currently assumed system boundary that seemed to be creating the paradox that we were struggling with.

We don't think it reasonable to draw a system boundary around a Hummer, the local biodiesel factory and as many chip shops as we need to fuel. However that is what we are doing when we claim that putting biodiesel in our car makes it zero carbon when in fact the exhaust continues to emit carbon dioxide at a similar rate to before.

The argument for biomass is slightly more involved as it is less of a liquid asset. Indeed it is not just a question of what else could we do with the trees, agricultural residue or short rotation coppice, but what else could we do with the land.

4. The CO2 figure we used was, as it says in the footnote, based on wood burnt in a boiler at 78% efficiency, ie 0.36kg CO2/kWh of wood burnt. Very happy to refine this figure if you can suggest a better one but our argument does not hinge on the precise value, which will surely vary with moisture content etc.

5. Obviously we realise that oil, gas, uranium are finite and, being concerned about climate change, should cut back on burning all fossil fuels as a matter of urgency. This is an increasingly hard challenge. We would much rather have stumbled on a solution, rather than another problem, and have everyone love us, but as Bob Lowe said: “The most dangerous problems are the ones that you think you have solved. Anything that makes you think you have solved a problem that in fact you haven’t is therefore to be avoided, at almost all costs”

Regards

Nick

Mark Siddall

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Re: Biomass - a burning issue
« Reply #50 on: January 13, 2011, 10:23:15 AM »
I read the following today. It struck me the quote was pertinent to this discussion:

""Ideally we would have the mental flexibility to find the appropriate boundary for thinking about each problem. We are rarely that flexible. We get attached to the boundaries our minds happen to be accustomed to.....
......It is a great art to remember that boundaries are of our own making, and that they can and should be reconsidered for each new discussion, problem, or purpose. It's a challenge to stay creative enough to drop the boundaries that worked for the last problem and to find the most appropriate set of boundaries for the next question. It's also a necessity, if problems are to be solved well."

Dana Meadows, in Thinking in Systems
« Last Edit: January 15, 2011, 10:12:31 AM by Mark Siddall »

Nick Grant

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Re: Biomass - a burning issue
« Reply #51 on: January 13, 2011, 07:15:41 PM »
Nice quote Mark.

Just received this email from Matthew Wellesley-Smith about Nitrogen Cycle implications of biomass burning which we deliberately ignored:

"You have sparked a fascinating and very timely debate. I am not able to post on the forum so i thought I'd leave it up to you whether to add this into the mix (an essay I wrote a couple of years ago for the MSc at CAT). There may be some useful references.

http://www.scribd.com/doc/46795118

Matt"

Andy Simmonds

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Re: Biomass - a burning issue
« Reply #52 on: January 17, 2011, 10:54:39 AM »

Robert Morris

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Re: Biomass - a burning issue
« Reply #53 on: January 21, 2011, 04:12:31 PM »
Further to my first local AECB meeting this week when I became aware of this discussion paper here are some  thoughts from the permaculture perspective:

According to Simon Fairlie in his book 'Meat - a benign extravagance' the UK has one of the lowest levels of tree cover in Europe (around 11%, approximately 2.8million hectares campared to EU average of 40%)

If we increased this area in the UK to 25% or total of six million hectares (using half of the 6.4million hectares of rough grazing in the UK so as not to impact on fertile agricultural land unlike other Biomass crops) and allowing for a firewood yield of 3 tonnes per hectare per year after the current timber harvest of 10 million cubic metres is taken then there would be a firewood yield of 18 million cubic metres.

He then estimates that a well insulated three bedroomed house (perhaps AECB Silver/Gold)  for a family of four would require 5 cubic metres (3 tonnes a year) for space heating. This would be enough to heat six million homes or 40% of the population.

The British Trust for Conservation volunteers also estimate that  the quarter of a million miles or so of Britains hedgrows occupy a further 67,000 hectares from which a considerable amount of small guage firewood can be sourced and notes that in the 1980's 20% of all home grown hardwood was sourced from hedgerows.

My Tonwerk T Loft Plus ceramic stove has a a fuel efficiency of 86% and should be more than enough to heat my house of about 270m³ on one 6Kg firing each day on all but the coldest days (when it is finished!) as well as contributing to my hot water through a hot water absorber in the ceramic skin.
The timber framed house has used 14 cubic metres of locally sourced untreated air dried Douglas Fir and Larch and every offcut will be going into that stove!

You can keep your secure Russian gas!

Nick Grant

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Re: Biomass - a burning issue
« Reply #54 on: January 21, 2011, 08:58:01 PM »
Robert

I'd be interested to hear if you have any comments on the arguments put forward in the discussion paper.

In an early draft we were going to take your argument further and point out that if all buildings in the UK could be upgraded to the Passivhaus standard then we could meet the domestic heat demand with biomass. Still not what we think should be done even if it was possible and the pollution and other issues could be addressed.

Nick Grant

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Mark Siddall

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Re: Biomass - a burning issue
« Reply #56 on: March 07, 2011, 07:43:15 PM »
Scary....

Nick Grant

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Mark Siddall

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Re: Biomass - a burning issue
« Reply #58 on: April 01, 2011, 06:52:45 PM »
This link offers a little more background to Nick's post (found in the comments upon the article):
http://ec.europa.eu/environment/integration/research/newsalert/pdf/234na2.pdf

I find it interesting to note that the study assumes that there is NO market conflict and still reaches these conclusions. The demand for burning biomass is increasing and driven by competition for the limited resource that is biomass prices are steadily increasing - in essence we are already witnessing the emergence of market conflict in both physical and monetary terms.

Mark
« Last Edit: April 01, 2011, 07:28:47 PM by Mark Siddall »

Mark Siddall

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Re: Biomass - a burning issue
« Reply #59 on: March 09, 2012, 10:26:50 AM »
In interesting read: CO2 emissions from biomass combustion for bioenergy: atmospheric decay and contribution to global warming
http://onlinelibrary.wiley.com/doi/10.1111/j.1757-1707.2011.01102.x/abstract
« Last Edit: March 10, 2012, 06:40:00 AM by Mark Siddall »