large-scale biomass gasification plant...
TRANSCRIPT
Fuel conversion at the Vaasa power plant:
LARGE-SCALE BIOMASS GASIFICATION PLANT
INTEGRATED TO A COAL-FIRED BOILER
BioGaC Project,
Study Visit at Vaasa
November 25, 2014
Mauri Blomberg
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Contents:
1. Vaskiluodon Voima Oy, Vaasa power plant
2. Background of the project
3. The gasification plant project
4. Vaskiluoto gasification plant
5. Procurement of biomass
Large-scale biomass gasification plant
integrated to a coal-fired boiler
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Vaskiluodon Voima Oy
Vaskiluodon Voima was established in the late 1960s
and is equally owned by the energy companies
EPV Energia Oy and Pohjolan Voima Oy.
Company’s power plants, situated in Vaasa and
Seinäjoki, together generate 1,2 – 2.5 TWh/a of
electricity and around 800 GWh/a of district heat.
The power plants’ production of district heating covers
approximately 60% of the needs of the city of Vaasa
and 90 % of needs of the city of Seinäjoki.
As fuel Vaasa power plant uses coal, biomass and
peat. Seinäjoki power plant’s main fuels are biomass
and peat.
Vaasa
Power
Plant
Seinäjoki
Power
Plant
FINLAND
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Vaskiluoto 2
Investments were made in several phases:
Coal-fired boiler 1982
Desulphurization plant 1993
New turbine plant 1998
Biomass gasification plant 2013
In technical terms, the plant is
fit for use until 2030
Technical specifications:
Electricity output 230 MW
District heating 175 MW
Production:
Electricity 0,9 - 1.7 TWh/a
District heating 450 GWh/a; covering approximately 60% of the Vaasa area’s
district heating demand
Vaasa power plant – Vaskiluoto 2
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Vaskiluoto 2 - Process Diagram
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District Heating
175 MW Coal,
Biomass,
Peat
Vaasa
Boiler Plant
560 MW Turbine Plant Generator
230 MWe
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Vaskiluoto 2 - Process Diagram
G
GYPSUM SILO
LIMESTONE SILO
BOILER PLANT
LUVO
TURBINE PLANT
43 bar / 570 °C
185 bar / 536 °C
HP IP LP
FEED WATER
COAL SILOS
80 t/h
ESP
VAASA
DISTRICT HEATING NETWORK
COAL MILLS 4 PCS
FGD -PLANT
ABSORBER
GAVO
FLY- ASH SILO
250 MWe
175 MW dh
550 000 t/a
GYPSUM DEWATERING
CONDENSER
190 kg / s
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1. Vaskiluodon Voima Oy, Vaasa power plant
2. Background of the project
3. The gasification plant project
4. Vaskiluoto gasification plant
5. Procurement of biomass
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Fuel conversion - from coal to biomass
Domestic
biomass to
replace coal
Possibility of producing
competitively
condensing power
remains
Cost-efficient electricity
and heat production
Reduction of emissions
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Main drivers for the project
+ European emissions trading system and feed-in tariff for forest biomass
+ Taxation of fossil fuels used for district heating
+ National pressure to decrease the use of coal in CHP-plants
+ The possibility to extend the lifecycle of the existing power plant
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Technical options for reaching the
targets
1. A new CFB-boiler to replace the existing pulverized coal-fired boiler
+ Technically a good solution
+ Enables use of a wide range of biomass and other fuels
- High investment costs and long outage
- Uncertain investment environment
2. To add biomass grinding equipment to the current plant
+ An inexpensive technical solution
- Need for higher cost dry biomass, which can be ground to a sufficiently fine grade (normal forest chips are not feasible)
- With use of local biomass, only relatively small amount of coal could be replaced
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3. Integration of a biomass gasification plant to the existing coal-fired boiler
+ Enables use of a wide range of biomass and other fuels
+ A retrofit investment that is a relatively inexpensive solution
+ The existing coal-fired boiler can be utilized
+ Short project time and the need for only a few weeks’ outage of the existing power plant
- Technical risks of a new technology
- Some process risks with the existing coal-fired boiler
Technical options for reaching the
targets
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As a conclusion, gasification was
seen as the best suitable technology
for the Vaasa power plant.
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1. Vaskiluodon Voima Oy, Vaasa power plant
2. Background of the project
3. The gasification plant project
4. Vaskiluoto gasification plant
5. Procurement of biomass
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The gasification plant project –
key data
Project budget
Project’s overall budget is below 40 million euros
Ministry of Employment and the Economy granted an investment aid of
10,8 million euros for the project (renewable energy, new technology)
Main equipment supplier
Metso Power Oy
Time schedule of the project
Signing of the main equipment contract, May 6, 2011
Handing over of the gasification plant to Vaskiluodon
Voima, Jan. 31, 2013
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The gasification plant has a fuel input of 140 MW and can replace around 25–40 percent of the coal currently used at Vaasa power plant.
Gasification of wood, peat and field biomass results in product gas that is fired together with coal in the existing boiler
The gasification plant can be fired exclusively with forest biomass.
The gasification plant uses peat as the reserve fuel
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The gasification technology
Coal-fired boiler
Biomass dryer Fuel receiving and storage
Gasifier
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Power plant’s size and efficiency
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Small power plant,
efficiency 25 %
Large power plant,
efficiency 40 %
25 MW green electricity
40 MW green electricity + 160 MW coal electricity
100 MW,
fuel
100 MW,
fuel
400 MW,
coal
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The gasification plant layout
Fuel
receiving
Fuel
crushing and
sieving
Fuel
sampling
Fuel storage
silos
Forest chip
dryer
Gasifier
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Gasification plant – benefits
Main conclusions:
1. The gasification plant makes possible to use a wide range of bio fuels.
Possible to continue heat and power generation cost efficiently
2. The gasification plant reduces the use of coal by 25 - 40%.
3. The investment reduces power plant’s CO2-emissions by 230 000 tons/yr.
4. Positive impacts on the regional economy and employment:
The fuel used for gasification is domestic and locally produced;
EUR 15 million will be injected into the regional economy annually
(Earlier this money was used on imported coal and CO2-emission rights).
The gasification plant results in a direct, permanent net
employment effect of approximately 100 person-years.
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The gasification plant reduces the use of coal by 25–40%
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1. Vaskiluodon Voima Oy, Vaasa power plant
2. Background of the project
3. The gasification plant project
4. Vaskiluoto gasification plant
5. Procurement of biomass
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Bio fuels for the gasification plant
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The fuel required for the gasification plant (900 GWh/a) is procured locally within 100 kilometers of the plant:
Forest chips 90 % (50–100%)
Reed canary grass, grain and straw 0 % (0–5%)
Peat 10 % (0–50%)
Amount : 30 trailer-trucks a day
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1. Forest chips
Forest residue chips
Stem wood chips
Stump wood chips (mainly from
spruce trees)
2. By-products of wood-processing industry
Sawdust
Bark
3. Recycled construction wood chips
Bio fuels for the gasification plant
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Mauri Blomberg Managing Director Vaskiluodon Voima Oy +35850 377 7020 [email protected]
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