A Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing Nox And Soot Emissions

A diesel engine, exhaust gas recirculation technology, applied in combustion engines, exhaust gas recirculation, internal combustion piston engines, etc., can solve problems such as high cost durability

Active Publication Date: 2012-02-01
MAN ENERGY SOLUTIONS FILIAL AF MAN ENERGY SOLUTIONS SE TYSKLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, fuel pressure in small diesel engines often has values ​​above 2000 bar and fuel flow control at such pressure levels is technically very demanding and costly and will often create durability problems
[0009] Due to the sheer size and scale of large two-stroke diesel engines, techniques developed to control fuel at these high pressures in small diesel engines cannot be directly applied to large two-stroke diesel engines

Method used

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  • A Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing Nox And Soot Emissions
  • A Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing Nox And Soot Emissions
  • A Large Turbocharged Two-Stroke Diesel Engine With Exhaust- Or Combustion Gas Recirculation And Method For Reducing Nox And Soot Emissions

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Embodiment Construction

[0037] A detailed description of the crosshead large turbocharged two-stroke diesel engine and the method for operating the crosshead large turbocharged two-stroke diesel engine according to the present invention will be described below through preferred embodiments.

[0038] The construction and operation of crosshead large turbocharged diesel engines are likewise well known and require no further explanation herein. Further details regarding the operation of the fuel injection and exhaust system are provided below.

[0039] figure 1 A first embodiment of a large two-stroke diesel engine 1 according to the invention is shown. The engine 1 may for example be used as the main engine in a vessel traveling in the sea or as a stationary engine for operating a generator in a power station. The total output of the engine may, for example, range from 5,000 kW to 110,000 kW.

[0040] This engine is provided with a plurality of cylinders 2 arranged in line in parallel. Each cylinde...

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Abstract

A large two-stroke turbocharged diesel engine of the crosshead type provided with an exhaust gas recirculation system and with a fuel injection system that can, selectively add water to the fuel flow to thereby increase the mass flow through the injection nozzles under particular operating conditions, e.g. at high exhaust gas recirculation rates. The increased mass flow through the injection nozzles improves the entrainment of the fresh charge into the high-speed of the fuel spray and thereby increases the fuel/air mixing and brings the combustion towards the lean side and hence counteracts soot formation.

Description

technical field [0001] The present invention relates to a large turbocharged two-stroke diesel engine using exhaust gas recirculation to reduce NOx formation and a method for operating a large turbocharged two-stroke diesel engine using exhaust gas or combustion gas recirculation to reduce NOx formation method. Background technique [0002] Currently, there are several options for reducing NOx formation in large two-stroke diesel engines with changes applied to the engine process, in particular the following options: [0003] ●Exhaust gas recirculation (EGR) [0004] ●The use of water-emulsion fuel. [0005] ●Fresh air intake humidification, that is, scavenging air humidification (SAM). [0006] The most effective reduction method is EGR. Document DE 19809618 discloses a large two-stroke turbocharged diesel engine with exhaust gas recirculation (in this engine gas is taken directly from the cylinders and therefore this form of EGR is also called combustion gas recirculat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/03F02D21/08F02D41/00F02M43/04
CPCY02T10/121F02B37/00Y02T10/36F02M43/02F02B25/04Y02T10/144F02M25/0727F02M25/0747F02M25/0707F02M25/03F02M25/074F02M26/05F02M26/23F02M26/35F02M26/41Y02T10/12F02D21/08F02D41/00F02M43/04
Inventor 斯特凡·马耶尔
Owner MAN ENERGY SOLUTIONS FILIAL AF MAN ENERGY SOLUTIONS SE TYSKLAND
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