for different kinds of waste fuelled
power plants increase in China. “We
have delivered one municipal waste
fuelled CFB power plant to China
and have several other projects on-
going,” Janhunen adds.
The picture in Europe is more
mixed. While a number of countries
are using biomass-based plants for
power and heat, others such as Den-
mark are using it as part of a strategy
to handle waste, become carbon neu-
tral and create a circular economy.
Valmet has recently commissioned a
500 MW (thermal) biomass based
combined heat and power plant for
the city of Copenhagen and another
140 MW (thermal) boiler for Ørsted.
Germany sees biomass to energy as a
local solution similar to waste-to-en-
ergy.
The UK, however, has been far
more progressive on promoting and
utilising biomass. The Drax 4000
MW power station in North York-
shire, which was once the UK’s larg-
est coal red station, has been steadily
converted to biomass.
Further, Drax’s latest Teesside
project being undertaken by SFW
will be the largest CFB boiler in the
world ring only biomass when it
starts up in 2021/2022. Japan will use
this as a model to build its own super-
critical 300 MW biomass projects.
Meanwhile, the Nordics have long
been leaders in the use of biomass
throughout the value chain – from
pulp and paper to power generation
and heating. The governments are
well aligned with industry on the use
of biomass and the business is well
established and will continue for the
foreseeable future.
Both Finland and Sweden, with
their large biomass resources, are the
world leaders in the eld. Janhunen,
says biomass is a very important
energy source for district heating in
Finland and Sweden, and also for
industrial captive power heat and
power plants.
“In fact our roots are in the pulp and
paper industry, providing technolo-
gies that allows customers to turn
waste bark, sludge and wood-based
residues from their production pro-
cesses into energy instead of landll-
ing,” he said. “This is well aligned
with moves to the circular economy
and resource efciency programmes.”
Both SFW and Valmet, however,
believe that developers looking to
make the large long term investment
required for such projects, need to
know that their investment will be
secure, and this calls for supportive
legislation and market mechanisms.
Most countries have moved away
from Renewable Energy Certicates
to some form of feed-in tariffs to
support projects. Europe, however,
now seems to be discouraging sup-
port for biomass due to concerns
over the carbon neutrality of the en-
ergy resource.
S
ome argue that the ethical and
environmental concerns sur-
rounding the use of biomass as
a fuel for power generation make it a
poor solution in countries’ efforts to
get to net zero by 2050. Yet despite the
cons, it still can still play an important
role in national energy strategies to
tackle carbon emissions and combat
climate change.
“Biomass still has a good story to-
day; it’s not perfect, 100 per cent,
carbon recycling but you can get
pretty close,” notes Bob Giglio, Se-
nior Vice President at Sumitomo SHI
FW (SFW). “Even though the bio-
mass grown absorbs the carbon, you
have carbon leakage when you re-
admit it through the combustion pro-
cess. Although the amount you re-
admit is equal to the amount you
absorb, the extra energy you put into
the process, through transport and
processing the biomass into a burn-
able form, is usually provided by
non-renewable sources. But depend-
ing on how you process and harvest it,
you can get to around 95 per cent
[carbon recycling].”
With the ability to co-re or burn
biomass in modied coal burning
stations, Giglio believes burning bio-
mass is a better carbon reduction op-
tion than retrotting carbon capture
and storage to coal plants. “CCS
could get you to 90 per cent but you
will have to spend a lot of money. And
what do you do with the captured
carbon? With biomass it’s a natural
process.” He added: “To make bio-
mass plant economic, you need CO
2
to be in the €20-30/t range. For CCS,
you’re up in the €70-100/t range.”
Commenting on the CCS situation,
however, Kai Janhunen, Vice Presi-
dent of Energy at Finnish-based Val-
met notes that the discussion about
BioCCS or BioCCU (biomass based
carbon capture and utilisation) has
come on to the agenda in the EU and
the Nordics. “If CCS or CCU is in-
stalled in a biomass-based power
plant it would enable negative emis-
sion, which is increasingly on the
agenda in the European Union.”
Unlike renewable alternatives such
as solar and wind, however, biomass
requires land and water, and it re-
quires processing. But the upside is
that it is a dispatchable generating
source and can be stored. “Unlike
solar and wind, you can turn a bio-
mass plant on and off because the
energy is stored in the biomass,
whether on site or in the crop itself,”
said Giglio. “Today, biomass is the
only dependable, renewable, sus-
tainable source of energy we have.”
Countries with limited options on
near- or zero-carbon options in their
energy portfolios are recognising this.
A good example is Japan. Having
stopped most of its nuclear generation
following the Fukushima disaster, the
country now has to depend on expen-
sive imported natural gas and oil to
replace base load capacity. Giglio
said: “Coal is the obvious low cost
baseload replacement for nuclear, and
the government is trying to push it
despite public opposition, but it’s the
worst emitting in terms of carbon. So
Japan is in a tough spot.”
In this situation, biomass is a good
option, as it provides dependable
baseload power with the value of
carbon recycling – a capability that
Japan has recognised.
“To ensure energy sufciency, the
Japanese government drew up a feed-
in-tariff (FIT) scheme for renewable
electricity including biomass. This
system allows a higher FIT price for
biomass-based electricity production.
It has been the biggest driving force
behind the bioenergy boom and the
building of biomass power plants in
Japan,” Janhunen said.
Consequently, Japan is one of the
most aggressive and progressive in
pursuing large-scale, high-efciency
biomass projects. These larger more
efcient plants are important in re-
ducing the consumption of biomass
and thereby in improving the overall
carbon cycle and reducing land use.
SFW has been working with Japan
to develop 300+ MW single unit
plants that operate under supercriti-
cal conditions. Giglio commented:
“No one has done this anywhere else
in the world. Japan has the structure,
the will and the nancial capability
to do it.” He says, the company is
working with the government on
writing the policy that will then be
turned into a bidding programme and
then tenders for these larger scale
more efcient projects.
Another key market in Asia is
South Korea. It is similar to Japan in
terms of energy prole and strategy
– it is a large importer of fuels and
needs to keep electricity costs low. It
is therefore, according to Giglio, also
a target market for large, supercriti-
cal biomass plants.
He noted, however: “Unlike Japan,
Korea has greater public opposition
to biomass. The authorities have re-
alised that mixing demolition woods
and industrial waste material, etc.,
into the biomass streams, can reduce
fuel costs. The public, however, view
this as a type of waste-burning plant,
which still has a stigma as being bad
for the environment. Although a lot of
the gas emitted from those plants is
considered carbon-neutral, there are a
lot of toxins, chlorines, metals, plas-
tics, etc., that get into these fuel
streams that make them more afford-
able but require clean burning tech-
nologies, like uidised bed combus-
tion to ensure they don’t get into our
atmosphere.”
He added: “China is also looking at
biomass but is going more towards
the traditional trash-based fuel mar-
ket… as a way to connect their landll
problems with their climate issues.”
Valmet has also seen the interest
THE ENERGY INDUSTRY TIMES - APRIL 2020
Energy Outlook
14
Biomass has its
challenges but
arguably still has a
role to play in many
markets.
Junior Isles reports.
Biomass: burning issues
During a UN press conference in
December last year, Frans Timmer-
mans, Executive Vice President of the
EU, said: “The issue of biofuels needs
to be looked at very carefully. We
have to make sure that what we do
with biofuels is sustainable and does
not do more harm than that it does
good.”
Giglio noted: “You now have to go
through these ‘tollgates’ to get your
biomass certied… and there is a big
process to weed-out those projects
that are not that carbon neutral. A big
new no, no in Europe’s latest sustain-
ability plan is that you can’t source
the biomass outside Europe. That puts
a stop-sign in front of a lot of new
projects.”
According to SFW, this is mostly
affecting the growth of projects in
Europe that generate electricity only,
and to drive new power-only projects
into the market, carbon prices in the
EU emissions trading scheme will
need to be in the €50/t range. Never-
theless, the underlying market for
smaller niche, industrial CHP or dis-
trict heating type plants where there is
a local supply of biomass, is expected
to remain robust.
If investors are to have condence
in the long-term return on projects,
technologies that bring greater fuel
exibility and higher efciency will
be important.
Janhunen noted: “Circulating ui-
dised bed technology gives users the
opportunity to burn various different
fuels – biomass, coal or a mixture of
both, as well as new types of biomass
and waste. We are building more
technologies to access a wider range
of biomasses, especially in the area of
agro-based biomasses.”
He added: “The conversion rate
needs to be good so that we can gener-
ate the most electricity when com-
busting the biomass.” Valmet says
steam temperatures in its boilers can
now reach 560°C – even with partly
agro-based biomass. This enables
plant efciencies of more than 40 per
cent in condensing plant.
Giglio also believes efciency is
key to lowering costs, which also
comes with scale. “As we build big-
ger plants, on average they become
more efcient because there are big-
ger pieces that can contain the process
better and you have lower heat losses.
And we can push the steam condi-
tions higher to supercritical steam
conditions. So efciency and scale
both go together.”
At the same time boiler companies
are trying to advance technology to
burn low quality fuels efciently at
these higher temperatures with mini-
mum corrosion inside the boiler.
Ultimately, biomass burning and
co-ring with coal may fall globally
but it looks likely to remain an impor-
tant energy source for many countries,
especially in Asia, as they move to-
wards greening their economies.
Giglio says biomass still has a
good story today
Janhunen notes BioCCS or
BioCCU would enable negative
carbon emissions