CH713369A2 - Reduction of nitrogen oxide emissions from a supercharged diesel engine, turbo diesel NOx reduction. - Google Patents
Reduction of nitrogen oxide emissions from a supercharged diesel engine, turbo diesel NOx reduction. Download PDFInfo
- Publication number
- CH713369A2 CH713369A2 CH00115/17A CH1152017A CH713369A2 CH 713369 A2 CH713369 A2 CH 713369A2 CH 00115/17 A CH00115/17 A CH 00115/17A CH 1152017 A CH1152017 A CH 1152017A CH 713369 A2 CH713369 A2 CH 713369A2
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- Switzerland
- Prior art keywords
- fuel
- emulsion
- mixing chamber
- air
- diesel
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/02—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being water or steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0228—Adding fuel and water emulsion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
- F02M25/028—Adding water into the charge intakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
- F02M25/0222—Water recovery or storage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
- F02M2700/43—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel
- F02M2700/4302—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit
- F02M2700/4321—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit working with fuel and admission of auxiliary fluids such as water, anti-knock agents, hydrogen, ozone or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Exhaust Gas After Treatment (AREA)
- Supercharger (AREA)
Abstract
Die Erfindung betrifft einen aufgeladenen Mehrzylinder-Dieselmotor, umfassend einen Turbolader (1) mit einem Verdichter (1a) und einer Turbine (1b), einen Ladeluftkühler (2), ein Abblase-Ventil (3), eine Mischkammer (4a) zur Erzeugung einer Dieselöl-Wasser-Emulsion und eine weitere Mischkammer (4b) zur Erzeugung einer Mischung von Luft und Emulsion, eine Drosselklappe (5), einen Ansaugkrümmer (6), einen Auslasskollektor (8a), eine Abgasleitung (8b), ein Abgasreinigungssystem (11) und eine Hochdruck-Brennstoffleitung (9), ein Brennstoff-Verteiler-System (10) mit zwei getrennten Brennstoffleitungen (9a, 9b). Im bestimmungsgemässen Betrieb wird das Dieselöl in zwei Stufen in den Motor eingebracht. In einer ersten Stufe wird in der Mischkammer (4a) eine Dieselöl-Wasser-Emulsion angemischt, welche in der weiteren Mischkammer (4b) in den zugeführten Luftstrom eingespritzt wird. In einer zweiten Stufe wird das Dieselöl über die direkt zu den Zylindern (7) führende Hochdruck-Brennstoffleitung (9a) in die jeweiligen Zylinder eingespritzt. Damit sollen sich die Russ-Werte im Abgas reduzieren.The invention relates to a turbocharged multi-cylinder diesel engine comprising a turbocharger (1) with a compressor (1a) and a turbine (1b), a charge air cooler (2), a blow-off valve (3), a mixing chamber (4a) for generating a Diesel-water emulsion and another mixing chamber (4b) for generating a mixture of air and emulsion, a throttle valve (5), an intake manifold (6), an outlet collector (8a), an exhaust pipe (8b), an exhaust gas purification system (11) and a high pressure fuel line (9), a fuel rail system (10) having two separate fuel lines (9a, 9b). In normal operation, the diesel oil is introduced into the engine in two stages. In a first stage, a diesel oil-water emulsion is mixed in the mixing chamber (4a), which is injected in the further mixing chamber (4b) in the supplied air flow. In a second stage, the diesel oil is injected into the respective cylinders via the high-pressure fuel line (9a) leading directly to the cylinders (7). This should reduce the soot values in the exhaust gas.
Description
Beschreibung [0001] Die vorliegende Erfindung betrifft ein aufgeladener Dieselmotor gemäss dem Oberbegriff des Patentanspruchs 1.Description: The present invention relates to a supercharged diesel engine according to the preamble of patent claim 1.
[0002] Ein Dieselmotor, gemäss Fig. 2, (stellt schematisch einen 4 Zylinder Motor nach Stand der Technik), wo die Ansaugluft in einem vorgeschaltete Turbolader-Kompressor 1a vor komprimiert, danach in der Ladeluftkühler 2 vorgekühlt, und über ein Abblase-Ventil 3, und dann über die Drosselklappe 5, und Ansaugkrümmer 6 in den vier Zylinder des Dieselmotors 7, verteilt, eingeführt. Der Dieselbrennstoff wird durch die Leitung 9, über die Hochdruck Pumpe (über 1000 bar) in Brennstoff Verteilkrümmer in die Zylinderköpfe des mehr-zylinder Motors direkt eingespritzt. Erhöhung der Leistung mit erhöhtem Ladeluftdruck und mehr stufige Turbolader (in Bild nicht dargestellt) und somit erhöhte Luftmenge in den Zylinder und entsprechend wesentlich mehr Brennstoff-Einspritzung in Brennraum des Zylinders, trotz extrem höher Brennstoff Druck, zur starken NOx-Entstehung verursacht.A diesel engine, according to Fig. 2, (schematically represents a 4 cylinder engine according to the prior art), where the intake air is compressed in an upstream turbocharger compressor 1 a, then pre-cooled in the charge air cooler 2, and via a blow-off valve 3, and then introduced via the throttle valve 5, and intake manifold 6 into the four cylinders of the diesel engine 7. The diesel fuel is injected directly into the cylinder heads of the multi-cylinder engine through line 9, via the high-pressure pump (over 1000 bar) in fuel manifold. Increased output with increased charge air pressure and more multi-stage turbocharger (not shown in the picture) and thus increased air volume in the cylinder and correspondingly much more fuel injection into the combustion chamber of the cylinder, despite extremely high fuel pressure, causing strong NOx generation.
[0003] Der Grund dafür ist, die schlechte Mischung der Luft mit dem Brennstoff im Brennraum nach Einspritzung und folglich die lokale Konzentrationsverteilung des Brennstoffes in Brennraum sehr inhomogen ist und dieser Zustand zur lokalen Temperaturspitzen und entsprechend hohe Stickoxyd (NOx)-Werte führen.The reason for this is the poor mixture of air with the fuel in the combustion chamber after injection and consequently the local concentration distribution of the fuel in the combustion chamber is very inhomogeneous and this condition leads to local temperature peaks and correspondingly high nitrogen oxide (NOx) values.
[0004] Zwar wird versucht über Abgasrückführung, und -Reinigung (Oxydationskatalysator, Partikelfilter und Stickoxydkatalysator) die Stickoxyd-Werte zu reduzieren, aber wie die neueste Erfahrung zeigt haben diese Massnahmen limitierte Einflüsse, d.h. die Stickoxyd-Werte bleiben hoch trotz extrem hohen Brennstoff Einspritzdruck und weiteren beschriebenen Massnahmen.Attempts are being made to reduce the nitrogen oxide values via exhaust gas recirculation and purification (oxidation catalyst, particle filter and nitrogen oxide catalyst), but as the latest experience shows, these measures have limited influences, i.e. The nitrogen oxide values remain high despite the extremely high fuel injection pressure and other measures described.
[0005] Die vorliegende, im Patentanspruch 1 definierte Erfindung führt zu einer homogeneren Brennstoff Konzentrationsverteilung im Brennraum unmittelbar nach der Einspritzung da die Brennstoffmenge in Brennraum der Zylinderköpfe, infolge zwei stufigen Einspritzung, nun zu (100-n)% reduziert ist, und die n% der Brennstoffmenge in der ersten Stufe in Mischkammer 4b als Emulsion, (erzeugt zuvor in Kammer 4a), zu einer homogene Vormischung des Brennstoffes mit der Luft führt, die zu den Zylinder geführt wird, s. Fig. 1. Dadurch wird die Luft und der Brennstoff sehr gut vermischt und die lokale Konzentrationsverteilung in Brennraum homogener wird. Eine Selbstzündung des Brennstoffgemisches bis zum Brennraum ist nicht zu erwarten, da es eine magere Mischung ist und die Wasser tropfen in Emulsion die Zündung verzögert sowie unterdrückt die Russ-Bildung, die Mikroexplosion begünstigt die Atomisierung und führt zur besseren Mischung. Ausserdem kann mittels Flammensensors die Brennstoffmenge in der Leitung 9b reduziert werden.The present invention defined in claim 1 leads to a more homogeneous fuel concentration distribution in the combustion chamber immediately after the injection since the amount of fuel in the combustion chamber of the cylinder heads, as a result of two-stage injection, is now reduced to (100-n)%, and the n % of the amount of fuel in the first stage in mixing chamber 4b as an emulsion (previously generated in chamber 4a) leads to a homogeneous premixing of the fuel with the air which is fed to the cylinders, see FIG. Fig. 1. This mixes the air and the fuel very well and the local concentration distribution in the combustion chamber becomes more homogeneous. Self-ignition of the fuel mixture up to the combustion chamber is not to be expected, since it is a lean mixture and the water drops in the emulsion delay the ignition and suppress the soot formation, the micro-explosion promotes atomization and leads to better mixing. In addition, the amount of fuel in line 9b can be reduced by means of a flame sensor.
[0006] Der Wasserbedarf (aufbereitetes Wasser) ist gering, nur 15 Volum % der Brennstoffmenge durch die Leitung 9b, die wiederum nur n% (ca. 30 bis 35%) der gesamten Brennstoffmenge ist Eine Rückgewinnung gewisser Wassermenge durch Abkühlung des Abgases, ausreichend für die Kondensation des Wassers, und Rückführung in Wasserleitung 12 (Fig. 1), nicht dargestellt, wäre eine Alternative um Wasserbedarf von Aussen zu reduzieren, bzw. zu eliminieren.The water requirement (treated water) is low, only 15 volume% of the amount of fuel through line 9b, which in turn is only n% (about 30 to 35%) of the total amount of fuel. A recovery of certain amount of water by cooling the exhaust gas, sufficient for the condensation of the water, and return to the water line 12 (FIG. 1), not shown, would be an alternative to reduce or eliminate the external water requirement.
[0007] Bei den Benzin Motoren mit direkter Einspritzung kann die hier beschriebene zwei Stufige Einspritzung auch verwendet werden - für bessere Verbrennung und Russ Ausstoss Reduktion.In gasoline engines with direct injection, the two-stage injection described here can also be used - for better combustion and soot emissions reduction.
Fig. 1: Schematische Darstellung eines aufgeladenen Dieselmotors mit zwei-stufige Brennstoffeinspritzung; 1 Turbolader, 2 Ladeluftkühler, 3 Abblaseventil, 4a Kammer zur Erzeugung von Teilmenge - Dieselbrennstoff Emulsion und 4b zur vollkommene Vormischung der Teilmenge - Emulsion mit der Luft, 5 Drosselklappe, 6 Ansaugkrümmer, 7 Mehrzylinder (4 im Bild) Dieselmotor, 8a/b Auslasskollektor und Abgasleitung, 11 Abgas- Reinigung und -Steuerungssystem, 9 Brennstoff-Zufuhrleitung mit 9b 1. Stufe Mitteldruck Leitung und 9a zweite Stufe Hochdruck Leitung.Fig. 1: Schematic representation of a supercharged diesel engine with two-stage fuel injection; 1 turbocharger, 2 charge air coolers, 3 blow-off valve, 4a chamber for the generation of partial quantities - diesel fuel emulsion and 4b for the complete premixing of the partial quantities - emulsion with the air, 5 throttle valve, 6 intake manifold, 7 multi-cylinder (4 in the picture) diesel engine, 8a / b exhaust collector and exhaust line, 11 exhaust gas cleaning and control system, 9 fuel supply line with 9b 1st stage medium pressure line and 9a second stage high pressure line.
Fig. 2: Schematische Darstellung eines aufgeladenen Dieselmotors, nach Stand der Technik, 1 Turbolader, 2 Ladeluftkühler, 3 Abblaseventil, 5 Drosselklappe, 6 Ansaugkrümmer, Mehrzylinder (4 im Bild) Dieselmotor, 8a/ b Auslasskollektor und Abgasleitung, 11 Abgas-Reinigung und -Steuerungssystem, 9 Hochdruck Brennstoff-Zufuhrleitung.Fig. 2: Schematic representation of a turbocharged diesel engine, according to the prior art, 1 turbocharger, 2 charge air cooler, 3 blow-off valve, 5 throttle valve, 6 intake manifold, multi-cylinder (4 in the picture) diesel engine, 8a / b exhaust collector and exhaust pipe, 11 exhaust gas cleaning and Control system, 9 high pressure fuel supply line.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CH00115/17A CH713369B1 (en) | 2017-01-31 | 2017-01-31 | Charged diesel engine. |
Applications Claiming Priority (1)
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CH00115/17A CH713369B1 (en) | 2017-01-31 | 2017-01-31 | Charged diesel engine. |
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CH713369A2 true CH713369A2 (en) | 2018-07-31 |
CH713369B1 CH713369B1 (en) | 2019-08-30 |
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CH00115/17A CH713369B1 (en) | 2017-01-31 | 2017-01-31 | Charged diesel engine. |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115217615A (en) * | 2022-04-06 | 2022-10-21 | 广州汽车集团股份有限公司 | Scavenging device and scavenging method |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115217615A (en) * | 2022-04-06 | 2022-10-21 | 广州汽车集团股份有限公司 | Scavenging device and scavenging method |
CN115217615B (en) * | 2022-04-06 | 2023-08-15 | 广州汽车集团股份有限公司 | Scavenging device and scavenging method |
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