Cool & Hot 11. May Paris. Boiler conversion to biomass

Transcription

1 Cool & Hot 11. May Paris Boiler conversion to biomass

2 Conversion from eg. coal to biomass? Why? Biomass option is feasible! Biomass saves CO 2 emissions. Conv.: Much cheaper than totally new plant Conv.: Shorter installation time than new plant.. Why not? Rest life time to short Possible solution?

3 Energi Randers Energi Randers Produktion: 1982 Fuel: Coal Fuel heat input 2 x 95 MW Electrical power up to 52 MW District heating power up to 110 MW Main steam 111 bar C Not only Know How also Know Why

4 Getting confidence with biomass First step: Get experience with biomass at a low price (investment & operation costs) Cheap dusty fuel was available on the market: Olive stones / kernels, shea nuts, rape seed extraction, bio-pellets, meat and bone meal, other residues from process industries AET selected as supplier: 2003 AET dust firing system Up to 25 % biomass

5 AET Dust Firing System Very sturdy and robust system: High fuel flexibility Many used fuels Insensitive to fuel sizing Accurate fuel dosing Scale mass flow Batch filling Individual Dust Firing Lines Pneumatic fuel transport Safety against back fire Equipment outdoor ATEX Not only Know How also Know Why

6 Having confidence Second step Full fuel flexibility: 100 % coal 100 % biomass Any mix in between (e.g. 10 % coal and 90 % biomass) Biomass case is there Thermal calculation inspection conclusion Challenge: Change a well functioning coal boiler to 100 % biomass and continue to have 100 % coal without changing the coal boiler performance AET selected as supplier: 2008 Full installation for biomass full fuel flexibility

7 Design of the biomass plant

8 AET Dual-Fuel Spreader Injection of two fuels: Biomass Coal Uniform fuel injection in the furnace through: Adjustment of the distribution plate Pulsating air supply (butterfly valve) Adjustment of spreader air pressure Advantages: Best fuel distribution on the grate (fully covered grate surface) High degree of fuel burn-out Low emissions Not only Know How also Know Why

9 Specific changes at Energi Randers Re-use: Boiler pressure parts Firing grate Terteriary air system (former secondary air system) Upgrades: Furnace size & residence time: prolongation of the furnace: New duel fuel spreaders Secondary air system New Indenpendent control of air systems Flue gas recirculation: Primary air: Nox reduction adn improve superheater characteristics at coal Secondary air system: improvee superheating characteristic) Re-injection of unburnt carbon Extra heating surface

10 Energi Randers - today Energi Randers Produktion: 1982/2003/2008 Fuel: Combination 0-100% coal and 100-0% biomass (Olive stones, shea nuts, rape seed extraction, bio-pellets, meat and bone meal, wood chips ) Fuel heat input 2 x 95 MW Electrical power up to 52 MW District heating power up to 110 MW Main steam 111 bar C Firing systems (per boiler): Wood / coal at 4 spreader Dust on 3 DFS max 95 MW max 36 MW Not only Know How also Know Why

11 Selected References. Norske Skog As employees at Aalborg Industries 1987 Norske Skog 35 MW Norway Bark, wood. Fibrogen. Fibropower. Randers. Slagelse. Kronoply.. Gütersloh Western Wood..Cofely-BCN Schneider. Neumarkt Pannovosges. Boehringer FunderMax.. Linz Zignago Fibropower 48 MW England Poultry Litter 1993/ 1999 Fibrogen 51 MW England Poultry Litter / MBM 1994/ 2000 Pannovosges 46 MW France Waste Wood WID 1997/ 2002 Neumarkt 100 MW Germany Waste Wood - WID As AET 2000 Gütersloh 60 MW Germany Waste Wood - WID 2002 Kronoply 64 MW Germany Wood Waste 2004 Schneider 27 MW Germany Wood Waste 1988 Slagelse 34 MW Denmark Straw 2004 Boehringer 70 MW Germany Waste Wood - WID 2005 Linz 35 MW Austria Wood. Buddusò 2008 Western Wood 48 MW Wales, UK Wood 2006 FunderMax 50 MW Austria Waste Wood - WID 2009 Randers 95 MW Denmark Biomass / coal 2011 Cofely - BCN 55 MW France Wood 2011 Zignago 49 MW Italy Wood, energy crops 2012 Buddusò 50 MW Italy Wood, energy crops

12 Biomass Power Plant, Wales Western Wood Energy Plant, Port Talbot, 2008 Fuel: Fresh wood, saw dust, trimmings from forest, sawmill residue. Fuel heat input Electrical power 48 MW 15 MW Main steam 92 bar 512/522 C Firing system: Wood chips over 3 spr. Oil burner for start up 48 MW 15 MW NO x ~200 mg/nm 6%O 2 CO mg/nm 2 Handover O&M contract 2 weeks ahead 5 years Availability in test period 99,3% Not only Know How also Know Why

13 Thank you questions? Further information: Frank Scholdann Lund