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Published byMalcolm Simon Modified over 10 years ago
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Diesel emission reduction Student: Group: E Scientific adviser: Language adviser:
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Contents 1)Types of emission; 2)Ecological legislation; 3)Emission reduction; 4)Conclusion. 2
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1. Types of emission CnHmCnHm CONO x Particulate matters 3
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2. Ecological legislation Fig. 1. No x emission legislation for medium and low speed diesels. 4
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Fig. 2. Non-road NO x emission legislation. 5
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3. Emission reduction Exhaust gas aftertreatment: -Selective catalytic reduction (SCR); -Particulate matter filtration. Operating process optimization: -Miller combustion cycle; -Multiple injection; -Electronic control; -Exhaust gas recirculation (EGR). 6
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3.1. Operating process optimization 7
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3.1.1. Miller combustion cycle Fig. 3. Miller combustion cycle. 8
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3.1.2. Multiple injection Fig. 4. Injection characteristic of multiple injection. 9
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3.1.2. Multiple injection Fig. 5. Common rail fuel system. 10
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3.1.3. Electronic control Fig. 6. ECU engine management system. 11
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3.1.3. Electronic control Fig. 7. MTU engine ECU evolution. (ADEC – Advanced Diesel Engine Control) 12
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3.1.3. Electronic control Fig. 8. MTU engine ECU 9. 13
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3.1.4. Exhaust gas recirculation (EGR) Fig. 9. Schematic diagram of exhaust gas recirculation. 14
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3.2. Exhaust gas aftertreatment 15
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3.2.1. Selective catalytic reduction (SCR) Fig. 10. Schematic of the SCR system. 16
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3.2.1. Selective catalytic reduction (SCR) Fig. 11. Diagram of fuel consumption and nitrogen oxide emissions relationship. 17
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3.2.1. Selective catalytic reduction (SCR) Fig. 12. Genset with a 16 cylinder engine equipped with SCR system. 18
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3.2.2. Particulate matter filtration Fig. 13. Integration of the diesel particulate filter in the engine concept 19
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3.2.2. Particulate matter filtration Fig. 14. Functional diagram of the particle filtration. DOC – Diesel oxidation catalyst, DPF – Diesel particulate filter. 20
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4. Conclusion Main concepts of the modern diesel engine: -Low fuel consumption; -Low emission. It is possible due to: -Electronic control; -Interaction between all engine systems; -Exhaust gas aftertreatment; 21
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4. Conclusion Fig. 15. Schematic of John Deere diesel engine system. 22
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