The need for better control systems and fast technological renewal in small combustion appliances burning wood
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1 CONVENTION ON LONG-RANGE TRANSBOUNDARY AIR POLLUTION Expert Group on Techno-economic Issues (13th meeting) The need for better control systems and fast technological renewal in small combustion appliances burning wood Stefano Caserini
2 Outline: Domestic wood contribution to emissions and air quality Emission factors and critical points Trade off GHG /PM Regulations Conclusions
3 Italy Lombardy 9 Mil. inhabitants 56 Mil. inhabitants
4 Global mean tropospheric nitrogen dioxide (NO 2 ) vertical column density between January 2003 and June 2004, as measured by the SCIAMACHY instrument on ESA's Envisat NKPZD_index_1.html Lombardy Region
5 Wood combustion has been identified in the Italian and Lombardy emission inventory as an important source of primary PM10 emissions 100% 80% 60% 40% 20% no fuel others fuel oil natural gas wood kerosene LPG gasoil refinery gas diesel coal Lombardy 2005 emissions from all SNAP groups by fuel 0% PM2.5 PM10 TSP SO2 NOx NMVOC CO CO2 eq gasoline INEMAR: AtmospheRic EMission INventory Data available on the INEMAR web page for a public review
6 The role of wood combustion as a source of PM has been confirmed by studies on the presence of wood tracers in air samples. Although secondary aerosol formation is more relevant than primary emissions for both coarse and fine PM fraction, wood burning is relevant also in urban areas and strongly contributes to high peak of PM. PM from biomass burning, reconstructed by levoglucosan (a marker for biomass combustion) concentration, compared to total PM measured. PM (µg/m³) PM (reconstructed) PM (measured) (winter 2005) B.Fontana Sondrio Cantù Milan Mantova Source : Fermo and Vecchi, PARFIL Project, Lombardy Region
7 Emissions in Lombardy by SNAP group (year 2005) 100% 80% 60% 40% 20% 0% SO2 NOx VOC CH4 CO CO2 N2O NH3 PM2.5 PM10 TSP Combustion in energy and trasformation industries Combustion in manufacturing industry Extraction and distribution of fossil fuels Road Transport Waste treatment and disposal Other sources and sinks Non-industrial combustion plants Production processes Solvent and other product use Other mobile sources and machinery Agriculture
8 Domestic wood combustion in small installations is the dominant contribution to SNAP groups 2 - domestic heating Lombardy 2005 emissions in the SNAP groups 2 - domestic heating, by fuel 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% PM2.5 PM10 TSP SO2 NOx NMVOC CO CO2 eq fuel oil natural gas wood kerosene LPG gasoil
9 Critical point in the assessment of emission from small wood combustion installations - Type of appliance - System of measure (hot / cold) - Emissions during transient conditions (start up) - Burning cycle - Type of wood
10 Since 2003 the emission inventory consider four or five type of wood burning appliances Lombardy 2005 emissions in the SNAP groups 2 - domestic heating, 100% 90% by SNAP level III (type of appliances) BAT system burning pellets 80% 70% 60% 50% 40% 30% 20% 10% 0% PM2.5 PM10 TSP SO2 NOx NMVOC CO CO2 eq Pellets plant or BAT system burning wood Innovative low emission system and boiler Traditional oven, closed fireplace or insert Open fireplace Residential boilers < 50 MW
11 Emission factors are highly dependent on the type of appliance EF from a literature survey (EEA Emission Inventory Guidebook + other sources) PM10 NO X NMVOC SO 2 CO PAH g GJ -1 g GJ -1 g GJ -1 g GJ -1 g GJ -1 mg GJ -1 Open fireplace , , Traditional oven, closed fireplace or insert Innovative low emission system and boiler Pellets plant or BAT system burning wood , , , Automatic pellets stove BAT Source: Literature survey (EEA Emission Inventory Guidebook + other sources)
12 Distribution of wood combustion systems in Italy Innovative stove 4% Automatic pellets stove 3% Closed fireplace 20% Open fireplace 45% Traditional stove 28%
13 % number of appliances 55% 27% 27% 35% 16% 19% 7% 3% 5% 6% 36% 36% 46% 19% 19% 27% 4% 3% 7% 1% 72% 16% 6% 3% 2% 66% 18% 11% 1% 3% 55% 19% 19% 5% 2% 36% 36% 19% 7% 1% Open fireplace Traditional stove Closed fireplace Innovative stove Automatic pellets stove Source: Caserini S. et al. (2007) "New insight into the role of wood combustion as key PM source in Italy and in Lombardy region 15th US-EPA International Emission Inventory Conference. Raleigh, NC
14 Wood consumptions by appliance (%) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Piemonte Liguria Valle d'aosta Lombardy Veneto Trentino Friuli Emilia Romagna Toscana Marche Umbria Sardegna Lazio Abruzzo Molise Campania Puglia Sicilia Calabria Basilicata Open fireplace Traditional stove Closed fireplace Innovative stove Automative pellets stove Source: Caserini S. et al. (2007) "New insight into the role of wood combustion as key PM source in Italy and in Lombardy region 15th US-EPA International Emission Inventory Conference. Raleigh, NC
15 EF from natural gas and gas oil are much lower than the best EF from wood burning PM10 NO X NMVOC SO 2 CO PAH g GJ -1 g GJ -1 g GJ -1 g GJ -1 g GJ -1 mg GJ -1 Open fireplace , , Traditional oven, closed fireplace or insert Innovative low emission system and boiler Pellets plant or BAT system burning wood , , , Natural gas n.a. Gas oil Fuel oil Source: Literature survey (EEA Emission Inventory Guidebook + other sources)
16 Filterable /condensable PM measurement A lot of old PM emission factors from wood combustion rely only on the filterable fraction of PM, thus underestimating the true emission factor. It is important to consider the condensable fraction, material that is vapor phase at stack conditions, but which condenses and/or reacts upon cooling and dilution in the ambient air to form solid or liquid PM immediately after discharge from the stack. PM emission factor (g/gj) Pellets Hot smoke C 60 Wood stove Source: Stazione Sperimentale Combustibili, Parfil Project, Lombardy Region
17 Methodologies for the measurement of condensable fraction have been defined only in the last years CEN/TC 295/WG5 N 70/2006 Residential solid fuels burning appliances. Test methods
18 Emissions during transient conditions (start up) 700 Open fireplace - with beech-wood PM T flue gas 90 cumulat PM% Stoked fire 80 PM (mg/nm 3 ), T ( C) Refilling cumulat PM% s 0 Source: Angelino E. et al. (2008) Experimental investigations of the influence of transitory phases on small-scale wood combustion emissions, in press
19 Emissions during transient conditions (start up) Closed fireplace - with beech-wood. PM (mg/nm 3 ), VOC (ppm) PM VOC T flue gas Refilling Stoked fire T C s Source: Angelino E. et al. (2008) Experimental investigations of the influence of transitory phases on small-scale wood combustion emissions, in press
20 For road transport emission factor assessment, different reference cycles has been defined Vehicle speed (km/h) ARTEMIS urban Urban dense Free-flow urban Congested, stop Congested, Flowing low speed stable Cycle tim e (s)
21 Wood Burning cycle 50 Temperature near a closed fireplace 45 Temperature ( C) Source: Caserini S. preliminary data
22 Outline: Domestic wood contribution to emissions and air quality Emission factors and critical points Trade off GHG /PM Regulations Conclusions
23 There are net savings of GHG emissions using biomass instead of traditional fuels, notwithstanding the supply distances. PM, PAH and VOC emissions from small domestic devices need to be diminished, otherwise the widespread use of biomass could be critical in reaching more stringent PM standards. LCA results in terms of impact categories per tonne of dry biomass Scenario/device Greenhouse effect Human toxicity Air acidification Photochemical oxidant formation kg CO 2 eq kg 1.4-DB eq kg SO 2 eq kg C 2 H 4 eq 1 Open fire Traditional wood stove Low emission wood stove Pellet stove BAT CHP plant - 8 MW CHP plant - 8 MW (SRF) CHP plant MW Source: Caserini S. et al. LCA of domestic and centralized biomass combustion: the case of Lombardy (Italy), submitted
24 Controls Primary measures Secondary measures Cyclone separators Electrostatic precipitators Catalytic converters SCI manufacturer are skeptic about their real efficiency on the field
25 Regulations 1/2
26 Regulations 2/2
27 EF from SCI targets proposal for the Po Valley area PM10 Concentration in smokes mg/m^3 (13 %O2) PM10 Emission factors * g/gj mg/kwh Natural gas 0.2 Gasoil 5 Fuel oil 40 Literature data Open fireplace Traditional oven, closed fireplace or insert Innovative low emission system and boiler Pellets plant or BAT system burning wood BAT system burning pellets Denmark (21/12/2006) (cold) Denmark (21/12/2006) (cold) Austria (law limits - art. 15 B-VG) Austria - Limit for incentivations Germany (Munich) Target proposal (13% O2) Target proposal (11% O2) * It was considered a PCI equal to 17 GJ/t (dry beech wood) and a specific production of dry smokes equal to 11.5 m^3/kg at 13 % O2 Resulting conversion factors: (g/gj) / (mg/m^3); 2.44 (mg/kwh) / (mg/m^3); (g/gj) / (mg/kwh)
28 Conclusions /1 Positive aspects The number of regulation that limits the emissions of particulate matter produced by small devices burning biomass is increasing Some regulation distinguishes by type of sampling (cold / hot, regimen / transitory) There are also some interesting (and probably new) procedures about test certificates, controls, verification and the manufacturer s registry.
29 Conclusions /2 Negative aspects There are no limits clearly distinguished by typologies (e.g. open fireplaces / inserts / stoves / pellets). The limits appear to be high with respect to the potential of existing technologies, in particular for automatic stoves Some limit for small plants seems too high Also limits for centralised plants (i.e. 150 mg/m^3, 74 g/gj) seems to be in any way too high, and it doesn t take into account the slightest possibility of abatement systems, that could be already available for plants of a certain size. This kind of prescription, with these limits, would yield very few benefits in the Po Valley context. Better control systems for PM, PAH and COV are needed
30 Thank You
31 The use of biomass in district heating systems, that use flue gas treatment system, can cause a consistent reduction of impacts for all the considered categories. Actual role of biomass combustion in Lombardy in terms of emissions Biomass consumption Greenhouse effect PM 10 emissions CO VOC t year -1 t CO 2 eq year -1 t year -1 t year -1 t year -1 Open fire 417,747-23,511 2,588 29,242 1,462 Traditional wood stove 1,582, ,307 4, ,789 5,539 Low emission wood stove/boiler 480, , , Pellet stove BAT 19,518-19, Subtotal residential devices 2,500,000-1,144,864 8, ,431 7,835 CHP plants?10 MW 70,000-49, CHP plant 100 MW 230, , Subtotal CHP plants 300, , TOTAL 2,800,000-1,331,487 8, ,838 Source: Caserini S. et al. (2008) LCA of domestic and centralized biomass combustion: the case of Lombardy (Italy)
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