Experiences in using alternative fuels in Europe and Germany
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1 Experiences in using alternative fuels in Europe and Germany Martin Schneider, Düsseldorf Kielce, 13 November 2008
2 Structure Boundary conditions in waste legislation Use of alternative fuels in the cement industry Emission and quality control Summary
3 Clinker burning: high temperatures and long residence times
4 Process Characteristics of cement kilns max. gas temperature of 2000 C gas retention times of up to 8 s at temperatures above 1200 C max. material temperature 1450 C oxidizing gas atmosphere gas retention times in the secondary firing more than 2 s at temperatures of 1100 C
5 Process Characteristics of cement kilns (II) uniform burnout conditions destruction of organic pollutants no de-novo syntethis of dioxines and furanes sorption of gaseous components like Hg, HCl, SO 2 on alkaline reactants
6 Waste incineration under control: Strict requirements from European legislation The European Directive on the incineration of waste: harmonizes European legislation for the incineration of waste confirms the important role of coincineration in European waste policy demands an extremely high level of environmental protection
7 Wastes always serve as raw materials and fuels Example: used tires organic content: fuel Alkalis, Zn Fe inorganic content: raw material SiO 2 CaO, S, Al 2 O 3
8 Directive 2000/76/EC on the incineration of waste Pollutant C Total dust 30 HCl 10 HF 1 NO x 500 1) /800 2) Cd+Tl 0.05 Hg 0.05 Sb, As, Pb, Cr, Co, Cu, Mn, 0.5 Ni, V Dioxins and furans 0.1 SO ) TOC 10 3) daily average values 10 % O 2, dry in mg/m 3 (dioxins ng/m 3 ) 1) new plants 2) existing plants 3) exemptions may be authorized by the competent authority in cases where SO 2 and TOC do not result from the incineration of waste
9 Alternative fuels in EU cement industry (2004) In 2004 the European Cement industry recovered more than 6 Mio tonnes of waste This corresponded to an average energy substitution rate of about 17 % Source: CEMBUREAU
10 European fuel mix for clinker burning percentage of thermal energy CEMBUREAU 2002 CEMBUREAU 2003 CEMBUREAU coal / lignite petcoke other fossil energy carriers alternative fuels
11 Alternative fuels (examples) Solid alternative fuels e.g. Paper waste Textile waste Carpet waste Plastic waste Rubber waste Waste tyres Fuller earth Waste wood Fractions of domestic waste Sewage sludge Meat and bone meal Liquid alternative fuels e.g. Tar Acid sludge Waste oil Petrochemical waste Varnish residues Chemical waste Waste solvents Distillation residues Wax suspensions Asphalt sludge Oil sludge Gaseous alternative fuels e.g. Landfill gas Pyrolysis gas
12 Waste fuels in the German cement industry Share of alternative fuels in %
13 Use of alternative fuels in the German cement industry alternative fuels quantity in 2007 [1.000 t/a] used tyres 289 waste oil 85 fractions of industrial wastes (e.g. plastics, paper, textiles, etc.) 1595 meat and bone meal, fat 293 pretreated fractions of municipal wastes 186 scrap wood 13 solvents 100 sewage sludge 254 others, like 90 oil sludge organic distillation residues
14 Development of the substitution rate for some alternative fuels pretreated industrial and municipal wastes Mio GJ/a meat and bone meal used tyres waste oil sewage sludge
15 Waste fuels for the cement industry - examples plastics dried sewage sludge animal meal of different origin and granularity
16 Alternative raw materials (examples) Ca-group Si-group Fe-group Al-group Si-, Al-, Ca-group S-group F-group e.g. e.g. e.g. e.g. e.g. e.g. e.g. Industrial lime Lime sludge Foundry sand Pyrite cinder Synth. hematite Red mud Tin slag Waste from the metal industry Fly ash Slag REA gypsum Chemical gypsum CaF 2 -filter sludge Carbide sludge Drinking water sludge Converter dust Mill scale Residues from paper industry Residues from natural stone industry
17 Alternative raw material - example concrete crusher sand Demands on physical and chemical properties: main components: CaO, SiO 2, Al 2 O 3, Fe 2 O 3 content of chloride, sulphur, alkaline content of trace element and VOC homogeneity moisture access, e. g. seasonal fluctuations handling, e. g. possibilities of storage
18 Concrete crusher sand three-substance diagram CaO in % Composition of already utilised materials 60 SiO 2 in % clinker Al 2 O 3 + Fe 2 O 3 in %
19 Choice of samples for simulation of clinker burning process clinker CaO in % Concrete crusher sand no. SiO 2 in % L 1F Al 2 O 3 + Fe 2 O 3 in %
20 CO 2 saving after 3% substitution of natural sand 3,0% 1F decrease of CO2 emissions 2,5% 2,0% 1,5% 1,0% 0,5% 1 1L ,0% 0% 5% 10% savings of primary raw materials
21 Used tyres
22 Used tyres
23 Used tyres
24 Liquid alternative fuels Regular sampling of liquid alternative fuels is a decisive prerequisite for a sound quality assurance system
25 Alternative fuels in cement kilns reduce emissions emissionswaste emissions emissions waste coal waste coal landfill or dedicated incinerator + cement plant cement plants
26 Landfills result in methane emissions Potential of methane emissions (kg CO 2 eq/t) given for European landfills: food wastes 1500 agricultural wastes 1700 textiles 800 paper 1600 plastics 0 uncontrolled landfills emit about 700 kg CO 2 eq per tonne of waste.
27 Examples for intake materials to be treated Source: Ecowest GmbH
28 Pretreated alternative fuel Source: Anneliese Zementwerke AG
29 Pre-treated alternative fuel
30 Procedure of mechanical-biological treatment mechanical pre-treatment biological treatment fractional flow (optional) mechanical after-treatment energy recovery ca. 30 % of the intake material recycling landfill Source: BMU
31 Modern pre-treatment plant
32 Modern pretreatment plant Source: Ecowest GmbH
33 Emissions have to be measured according to the Directive
34 Quality of the wastes has to be monitored when needed
35 Positive experience with alternative fuels and raw materials Cement works utilize selected wastes the intake material must suit the process and the product The question whether an individual waste is hazardous or not is only of minor importance Waste utilization does not cause any rise in the emission level Product quality is not impaired The cement industry is able to deliver a valuable contribution to an environmentally sound waste management
36 Thank you for your attention!
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