Efficient Use of Biogas, Sewagegas and Landfillgas
Combined Heat- and Power Generation
Schnell
Dual Fuel Technology
Wolfgang Jörger
Schnell Zündstrahlmotoren AG & Co. KG
Hugo-Schrott-Straße 6
88279 Amtzell, Germany
Tel.: +49 (7520) 9661-0
www.schnellmotor.de
Innovative – modern – ground-breaking
Index
Schnell, the company
Principles of biogas and dual fuel technology
Schnell dual fuel technology
Schnell services and products
Schnell product portfolio / service data
Standardisation and series production
Benefits of dual fuel technology
Innovation
Conclusion
Schnell, the company
Founded in 1992 by Hans Jürgen Schnell
Planning and construction of some 60 complete
biogas plants.
Currently > 285 employees
14,000 m² covered production facilities
At present, some 2,300 machines operating in
20 countries on 4 continents
Production capacity of up to 1,000 modules per
annum
Market leader in the production of dual fuel units
Of the more than 4.600 Biogasplants in Germany,
approx. 1.800 are powered by Schnell
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Schnell, the comany
Amtzell/Korb:
Headquarter
R & D and Service
Schnell, the company
Wangen:
Management and production
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Schnell, the company
Serial production of CHP units
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Principles
Biogas and dual fuel technology
Properties of biogas:
Relationship between energy content and anti-knocking quality
Energy content
Methane number
Natural
Gas
Knocking resistance
Natural
Gas
Natural
Gas
CH4 Content %
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CIS
North
Sea
CH4 Content %
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Principles
Biogas and dual fuel technology
Properties of biogas:
Relationship between energy content and laminar flame velocity
Energy content
Laminar flame velocity
Natural
Gas
CH4 Content %
© Schnell Zündstrahlmotoren AG & Co. KG
Natural
Gas
CH4 Content %
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Principles
Biogas and dual fuel technology
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Schnell dual fuel technology
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Schnell dual fuel technology
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Schnell dual fuel technology
Benefits of regulating the ignition timing and
combustion temperature individually for each cylinder:
reduces faults and downtimes
improves engine service life
stabilises and increases efficiency
improves emissions values
can be converted to 100 % vegetable oil operation
reduces ignition oil volumes
economic use of biogenic ignition oils
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Schnell services and products
Schnell, a system supplier for the complete CHP
system:
CHP plant including instrumentation and control
technology
gas conditioning / gas blower
ignition oil tank system
exhaust gas heat exchanger
emergency cooler
heat distribution
sound absorber/noise insulation
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Schnell services and products
Consulting
Planning
Installation and Commissioning
Documentation
Service and Warranty
Schnell-Academy
Schnell product portfolio/
service data
Electrical efficiencies of Schnell dual fuel engines
el. output
output
efficiency
in accordance with DIN 3046
biodiesel ignition oil
consumption / hour
40 kW
60 kW
75 kW
150 kW
170 kW
180 kW
250 kW
265 kW
340 kW
37.0 %
39.0 %
40.0 %
41.0 %
41.5 %
42.0 %
43.0 %
47.0 %
44.0 %
0.8 litres
0.8 litres
1.0 litres
1.4 litres
1.4 litres
2.3 litres
2.3 litres
2.3 litres
3.1 litres
500 kW, 700 kW and 1.3 MW unit under development and testing
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Standardisation
and series production
enhances unit availability:
98 % of the plants achieve better than
8,400 hours of operation/year
example of a peak plant:
annual availability in the last two years over
8,700 hours at full load
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Benefits of dual fuel technics
heating up phase/run-up operation without external
heating
recommissioning/start-stop
not sensitive to fluctuations in methane gas which can be
caused by:
irregular supplies of coproducts
throughput of large volumes of slurry
starting and operation possible, even with poor gas quality
dual fuel engine starting is assured down to less than 30 % CH4
whereas below 40 % CH4 most gas engines will no longer start
high reliability of supply for heat supply contracts
economic advantage of high electrical efficiency
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Benefits of dual fuel technology
Comparison calculation for 2,472 m3 biogas/day
Electrical output
Electrical efficiency
Biogas production per day/year
2,472 m3
Calorific value of biogas
Energy input from biogas per annum
5 kWh/m³
Biogas consumption at 50 % CH4
Full load hours per day
Ignition oil use per hour/year
2.3 l/h
Energy input from ignition oil per year
Dual fuel engine
ES 250
Gas spark-ignition
engine 200 kW
250 kW
42 %
200 kW
39 %
902,280 m³
902,280 m³
4,511,400 kWh
4,511,400 kWh
114 m³/h
21.7 h
103 m³/h
24.0 h
18,217 l/a
182,173 kWh
Power generation per annum
Power revenue per annum
Average feed-in tariff EEG 2009
1,953,405 kWh
1,743,788 kWh
€ 407,675
€/kWh 0.2093
€ 371,601
€/kWh 0.2131
€ 391,917
€ 15,758
of which generation revenue from biogas
of which generation revenue from ignition oil
€/year 17,306
€/year 0.0
Power revenue minus ignition oil costs per annum
Power revenue minus ignition oil costs per month
€ 390,369
€ 32,530
€ 371,601
€ 30,967
Profit difference per annum
Profit difference per month
€ 18,768
€ 1,564
Ignition oil costs per l/year
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€/l 0.95
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Benefits of dual fuel technology
Efficiency benefit of the Schnell dual fuel
engine:
enhanced electrical efficiency of the electrical
CHP unit means increased power production for
the same energy use/biogas
A comparison:
The volume of gas required to operate a 200 kW sparkignition CHP unit can run a 250 kW electrical output dual
fuel motor CHP unit.
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Innovation
'Turbine generator'
downstream turbine as
supplementary module (30 kW
electrical possible):
additional exploitation of
exhaust
increase of electrical efficiency
up to 48.5%
possible technology bonus for
turbine generator power (acc. to
German legislation)
enhance economic efficiency of
biogas plant
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Innovation
power turbine
high speed turbine generator
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Innovation
TG V2
Market launch
Feb. 2010
60 units sold,
31 in operation (Sep. 19
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2010)
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Conclusion
In order to operate biogas plants, of whatever size,
as efficiently as possible, the modern Schnell dual
fuel unit is more interesting than ever because of
its high electrical efficiency, high reliability and
potential for innovation.
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P.S. One who goes for an inefficient unit will later have
to find more substrate.
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Many thanks for your attention.
www.schnellmotor.de
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