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Biomass Heat is Not Coal

By Andrew Haden, A3 Energy Partners
August 23, 2010   |   14 Comments

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14 Reader Comments
Comment
1 of 14
August 24, 2010
Do we have enough wood waste to provide heat? We certainly DO NOT when it comes to the, as you pointed out, grossly inefficient means of biomass electricity generation. True, there isn't mercury, but biomass still has its own set of pollutants besides the particulate matter. Are there new boilers in the production pipeline that address this?

For some info critical on biomass, particularly for electric generation I recommend visiting www.energyjustice.net/biomass
Comment
2 of 14
August 25, 2010
Nicely said. Exploitation of waste biomass for direct conversion to useful energy is indeed the right thing to do. It's far better than co-firing with coal in a much less efficient plant or wasting the biomass by "storing" it in landfills. It is also important to keep the demand for biomass fuel in balance with the regional supplies of waste biomass to insure the higher-value biomass is preserved for higher-value uses such as pulp & paper, flooring, etc. and to insure that the emissions benefits of biomass utilitization aren't more than offset by emissions resulting from its transport.
Comment
3 of 14
August 25, 2010
What people fail to see is that it is beneficial for the US to be involved with as many different types of energy production facilities as possible. The writer does a good job at explaining the downfalls of the new proposed EPA rulings and what they will do to an industry. I do not understand the relationship between a heat plant being 85% efficient and a cogen facility being only 30%. They are the same thing except for the turbine/generation equipment. Almost all wood biomass boilers, whether for heating or electrical generation are in the 70 to 75% efficiency range. As for the turbine, I can't imagine that they are that much more inefficient than a air to hot water heat exchanger that would heat your building. Our friend Robert's site is very misleading on what is really happening in the industry as far as what is actually being burned in these wood biomass facilities. Robert's site is trying to lump everything together like the EPA. The majority of new wood fired power plants and co-fired power plants are burning whole tree chips and forest debris(limbs, branches, etc). The key to a wood fired plant is size. Some of the plants that are being talked about around the US are way too large and consume too much wood for one area. I feel that they should be limited to 20-30MW and nothing larger. I have worked in the renewable energy field with different types of renewable energy for 15 years and the most inefficient renewable energy are wind farms. A wind turbine can be designed for 2MW and you would be lucky to get that for 5 hours a year. Hydro seems to be best, although not as many spots, then solar (depending on location), wood biomass (depending on size) and then wind (depending on how many wind turbines you can crame in an area). I am not familiar with geo. Definitely diversity.
Comment
4 of 14
August 25, 2010
---"...it's important to support reducing greenhouse gas emissions, particulates ...from burning fossil fuels."---

It's important to reduce them from any fuel, not just fossil fuels. Burning biomass does not reduce particulates and only reduces GHG emissions if waste wood is used, which is not always the case and certainly will become a small percentage of the fuel if biomass is allowed to scale up very far.

The definition of "waste" begins to get fuzzy very quickly. Any tree that does not have more value as lumber or paper pulp can be easily be defined as waste. Cypress trees are being cut to make beauty bark, why not for biomass burning? Is corn stover a fuel, feed, or a fertilizer?

---"But by lumping biomass heating boilers—which do not emit mercury"---

The EPA knows they don't emit mercury. The regulations are not aimed just at mercury emissions.

---"All this makes sense for big coal plants, but not for small boilers heating schools, homes, and hospitals." ---

Odd that you would list schools and hospitals as places where clean air is not important.

---"They are also clean—a boiler large enough to provide all the heat and hot water for a 25,000-square-foot building puts out fewer harmful emissions than the average EPA certified wood stove used to heat a small home." ---

Clean is relative. Comparing a commercial biomass boiler to a residential "EPA certified" wood stove is quite misleading. They certainly are not clean when compared it to a natural gas fired boiler. If Seattle switched from natural gas to biomass boilers for heat we would see a huge degradation of air quality. And note the words "EPA certified." The wood stove lobby fought that certification just as you are fighting it.

---"...biomass heat boilers are 85% efficient as opposed to biomass electricity generation, which is only 25% to 30% efficient at best..." ---

Which is irrelevant because you are comparing apples to oranges, building heating to electricity generation.
Comment
5 of 14
August 25, 2010
---"They are the most efficient, cost-effective, and sustainable heating source available." ---

Natural gas is more efficient and cost effective. Solar hot water is more sustainable. Biomass is only sustainable as long as you don't start burning more than just waste, which isn't the case today and will get worse if biomass continues to scale up.

A big backlash is growing in Europe against scaling up biomass (much of which is being imported) for energy.

The EPA regulated car and wood stove emissions long ago. I'm sure the same arguments were used by their lobbyists as you are making here.

Everyone claims that their pet project will create jobs. That can only be true if said project does not need federal subsidy to do it (which takes funding away from other jobs creating job destruction).

Anything written by a person who profits from an industry is little more than a press release. That's just human nature.
Comment
6 of 14
August 25, 2010
"Do we have enough wood waste to provide heat?"

Yes, there is enough waste wood to scale up the biomass heating industry from decades without bumping into the limits of waste wood availability. ~10 million tons in Oregon alone. That equals 65% of Oregon natural gas use (160 Trillion Btus).

http://www.oregon.gov/ENERGY/RENEW/Biomass/resource.shtml

Washington State should have a similar amount of waste wood available.

"I do not understand the relationship between a heat plant being 85% efficient and a cogen facility being only 30%. They are the same thing except for the turbine/generation equipment."

That is correct, but I am not talking about co-gen. Go-gen is also nominally 85% efficient. I am talking about stand-alone electric power plants, which are basically small coal plants (~25% efficient), with ~75% of the energy going up the stack, wasted.

"The key to a wood fired plant is size. Some of the plants that are being talked about around the US are way too large and consume too much wood for one area. I feel that they should be limited to 20-30MW and nothing larger."

I more or less agree with this, and the economics of transport distance will likely enforce the size limit.

"Natural gas is more efficient and cost effective. Solar hot water is more sustainable."

Natural gas is not renewable, so it is entirely unsustainable, by definition. Solar hot water is great for DHW during the brighter 6 months of the year, but anyone looking to provide year-round heat quickly realizes the limits of going much beyond DHW and seasonal reliance.

"Which is irrelevant because you are comparing apples to oranges, building heating to electricity generation."

The point is that given two competing uses (heat, (non-CHP) electricity) for a limited resource, we should favor the 85% efficient option over 25%. We'll be 3x better off.

In the northern, forested regions, we need fuels for heating, and the only local renewable fuel with a positive net energy balance is biomass.
Comment
7 of 14
August 26, 2010
I took a look at the disinformation at www.energyjustice.net and I learned these people are still in the dark ages and have not yet learned about the difference between incineration and advanced thermal conversion. Do try to get a grip on reality guys,, or are you a front group for the fossil fuel industry?
Comment
8 of 14
August 28, 2010
We have put together a presentation that goes into greater depth on the EPA ruling and the Manomet Study.
More info at the link:
http://biomassfuelssummit.com/epa-biomass-ruling/
Comment
9 of 14
September 7, 2010
Andrew, you're willing misleading the readers, which is to say, you're lying. I don't know why, really.
When you say heat is 85% efficient and then say electricity is but 25-30% efficient, you purposely fail to mention that heat + electricity is almost 100% efficient. Why the glaring omission ? Who's paying you for that ?
Shameful behavior.
Comment
10 of 14
September 8, 2010
Clee: I agree with you, but the EPA needs to set out a clear roadmap that ratchets up over time (more than 4 months). Furthermore I believe they should offer R&D funding in concert with USDA and USDOE to help industry develop cost effective technologies to meet the new lower emissions levels.

MJMIZERA: I addressed this in my first comments, and attempted to in the article, but not sufficiently, apparently. I am talking about stand-alone electrical generation facilities being 25%-30% efficient. Co-gen is also very efficient (up to 85%), but not the "almost 100%" that you mentioned, so shamefully.

http://www.epa.gov/chp/basic/methods.html
Comment
11 of 14
September 14, 2010
Andrew,
Please keep up the good work. A thick skin might be helpful as well.
There are many presumably well-meaning, but misinformed folks who question the combustion of anything, or try to compare the use of renewables to the best aspects of fossil fuels, ignoring the obvious that fossil fuels are finite.
Oil and Natural Gas are going to be a very tough act to follow, in terms of BTU-density, but ultimately follow we must.

And to the skeptical among us, please avoid the personal attacks. "Liar" is a very strong word, and hardly applicable among those of us who are working on various paths toward sustainability.
Comment
12 of 14
September 21, 2010
The EPA needs to get its act together; if fialed in teh gulf oil leak.tehy are trying to push hazardous ineffcient wind; solar; and battry power based on a regilious cult to get back at big oil.

Learn and study God's system to clean heat and cool the earth and eveytime we add a new road or structure we take away from God's system.
Call it the heat island affect whcih is mentioned by every TV weatherman.

Look at all of the equipment and processes required to harness wind; solar and battery and add mining; hazardous chemical; carbon by products used and pollutants released during all and you lost green in th equation
Comment
13 of 14
November 1, 2010
Actually, Fuelmaker, Andrew is correct on the efficiency of biomass plants, but lets put it in a different prospective. A plant that ONLY produces electricity (a cogen plant) only uses about 30% of the AVAILABLE energy, the other 70% in the form of steam is wasted into the atmosphere. On the otherhand, a CHP plant (Combined Heat & Power) utilizes the other 70% by providing heat (even A/C with coolers) for buildings and manufacturing processes.
Comment
14 of 14
November 2, 2010
russ-----" Natural gas is more efficient and cost effective. Solar hot water is more sustainable."--------

So compost the biomass and produce methane. Methane(natural gas) is clean and efficient---and works perfectly in tandem with solar thermal auxiliary systems. Your furnace and water heater work exactly the same as they always have---they just come on less often, and don't run as long, and don't use nearly as much energy.

And the compost left over after the anaerobic digestion of the biomass is a valuable commodity in itself.
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