Présentation de Mirom
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Transcript of Présentation de Mirom
13-04-20231
EXPERIENCES WITH AN ORC TO INCREASE THE ENERGY EFFICIENCY IN
A MUNICIPAL WASTE INCINERATOR
Jeroen Vanwalleghem
13-04-20232
Summary
The waste incinerator of MIROM. Extension of the heat recovery with electricity. The organic rankine cycle. Application in MIROM Roeselare. Some data, graphs and results. Calculation of expenses. Conclusion and future.
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MIROM Roeselare
Is a union of 15 municipalities established for collecting and treating municipal waste. The region counts 270.000 inhabitants.
The waste is collected separately: residual waste, paper, PMD (plastic and metal cans, bricks).
20 recycling parks. Own waste incinerator – only residual waste.
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The waste incinerator of MIROM
Two lines, each with a furnace, boiler, ESP, dry gascleaning with injection of bicar and active coal. Baghouse with Remedia catalytic filters and a shell denox system.
2 * 4 ton/h or 62.000 ton/year. Boilers with superheated water of 180°C.
2 * 7 MW or 115.000 MWh/y. Since 2010 extra Economizers: 2 * 0,75 MW
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18MW-180°C
110°C1986
180°C
3,1MWe
2008
1976
Gas : 7MW
2004
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Heat recovery
Primary circuit of 180 °C, pression 15 bar and heat exchanger.
Town heating system of 110 °C, 5 bar. 21 customers with a heat demand around 25.000
MWh. 5.000 MWh for preheating of combustion air. Expansion of the distance heating is not possible.
Forced to look for other systems to increase energy recovery.
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District heating
8
• Circuit to city centre: 4,5 km(x2)
• Circuit to greenhouses: 2,5 km(x2)
• 21 customers
MIROM
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Choice for electricity
MIROM did not find other customers who needed lots of energy.
Production of electricity was the only option. Primary temperature of 180 °C is far too low
to make electricity with steam.
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Why did MIROM choose an ORC
Boilers are still in perfect condition. The town heating system stays primary, so
energy to ORC will fluctuate. ORC is easily adjustable. Organic fluid evaporates at low temperature.
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Property of solkatherm
Looks like water, smells like solvent. Heavier than water: 1,36 kg/l. Boils at 35,6 °C. Not toxic. Not explosive or flammable. Self-ignition temp.: 580 °C.
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Some data
Installed: input = 17 MWth, output = 3,1MWe. Design conditions: input 15 MW, T amb. 15°C
gives output 2,4 MWe. Average efficiency: 15,6%. Range: 2.900 kW – 100 kW.
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Investment in EUR
ORC: 5.300.000Heat connection: 725.000Building: 900.000
Total: 6.925.000
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Heat recovery in 2011 in MWh
Produc-tion
boilersMWhth
Town heating
MWhth
PreheatPrim.
AirMWhth
Energy to ORC
MWhth
Produ-ced
electr.Mwhe
Total Recov.
MWh
142.525 24.100 5.200 107.000 16.930 46.230
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Production of electricity
See next slide. ORC runs since july 2008. Even in winter there is still production.
13-04-202319 jan feb mar apr may jun jul aug sep oct nov dec jan feb mar apr may jun jul aug sep oct nov dec
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Energy balance '08 - '09 Electricity - BOUGHT [MWh] Electricity - SOLD [MWh]
Total Electricity Production [MWh] Own consumption [MWh]MWh/month
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Balans elektriciteit 2011Aankoop - Totaal 195 MWh
Verkoop - Totaal 8814 MWh
Productie - Totaal 16930 MWh
Eigen verbruik - Totaal 8325 MWhMWh/maand
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Power '08 - '09Electricity - BOUGHT [kW]
Electricity - SOLD [kW]
Total Electricity Production [MWh]
kW
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Vermogens 2011
Gemiddelde Injectie actief vermogen
Gemiddelde Afname actief vermogen
Gemiddeld opgewekt vermogen ORC
Eigen verbruik
kW
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Efficiency
ORC follows thermal load between full range Guaranteed average gross efficiency =
15,6% Gross efficiency varies between 15% and
17% depending on outside temperature conditions and thermal load
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Reliability - Availability
Total amount of running hours during 2011 8364 hours (total availibility = 95,5%)
Total amount of running hours incinerators : 8396 hours
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Conclusion.
An ORC is a real added value for our heat recovery.
Even in winter we still have production of electricity.
Thanks to the GEC, the system is profitable. After the typical start-up problems, the ORC
runs smoothly with high availibility Little supervision necessary
04/13/202327
Future
There is a plan to build greenhouses of about 200.000 m² next to our ORC. We’ll use the cooling system to warm up the greenhouses.
There are plans to enlarge the town heating system: Up to 30 more industrial clients and 50 residential clients.
In this case, efficiency will decrease by a certain percentage, but the total recovery of energy will be very important.