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A method of reducing the nitrogen oxide emissions(NOx) of a supercharged piston engine and a piston engine arrangement

A technology for supercharging pistons and nitrogen oxides, which is applied to internal combustion piston engines, exhaust devices, engine components, etc., can solve problems such as hidden safety hazards, impracticality, and the wetting cylinder takes up a lot of space, and achieves effective use, Space saving, NOx reduction effect

Inactive Publication Date: 2008-08-06
WARTSILA FINLAND OY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This device is not practical due to the fact that the wetting cylinder needs to take up a lot of space, etc. At the same time, it will also cause certain safety hazards, because the large wetting cylinder is working under high pressure.

Method used

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  • A method of reducing the nitrogen oxide emissions(NOx) of a supercharged piston engine and a piston engine arrangement
  • A method of reducing the nitrogen oxide emissions(NOx) of a supercharged piston engine and a piston engine arrangement
  • A method of reducing the nitrogen oxide emissions(NOx) of a supercharged piston engine and a piston engine arrangement

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Embodiment Construction

[0021] Reference numeral 1 in each figure indicates a piston engine, which is connected to a turbocharger 2 as shown. Fuel nozzles 7 are arranged in connection with each cylinder for introducing fuel into the engine. A nozzle device 4 for introducing water into the combustion air is placed in the air passage 3 connected to the turbocharger 2 to send air to the engine. A corresponding nozzle arrangement 4' is also arranged upstream of the compressor of the turbocharger. The nozzle devices 4, 4' are connected to a water supply system (represented by reference numeral 10 in the figure). Depending on the application it will also include a source of water and possibly water preheating, preferably from the heat generated by the engine. Also arranged in the air channel 3 are heat exchanger means 5 for increasing the temperature of the heat exchanger air. The channels may also contain additional heat exchangers. The channel 3 is connected to the air chamber 8 of the engine 1, from...

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Abstract

A method of reducing the nitrogen oxide emissions (Nox) of a supercharged piston engine (1), in which method the pressure of the combustion air is elevated to a level higher than that of the ambient pressure by means of a compressor apparatus (2) and in which the moisture level is elevated (4, 4') and heat obtained from the engine exhaust gases is introduced (5, 5', 5.1) to the combustion air prior to feeding it to the combustion chamber of the engine. The invention also relates to a piston engine arrangement (1) comprising a number of cylinders, a turbocharger (2) comprising a compressor part arranged in flow connection which each cylinder through the combustion air channel (3) and a turbine part arranged in flow connection with each cylinder through the exhaust gas channel (7), the arrangement comprising a nozzle arrangement (4, ') for introducing water to the combustion air channel (3) and a heat exchanger (5) arranged in heat transfer connection with the combustion air channel, the heat exchanger (5) being in heat transfer connection with the exhaust gases.

Description

technical field [0001] The present invention relates to a method of reducing nitrogen oxide emissions from a supercharged piston engine and to a supercharged piston engine. Background technique [0002] Nitrogen oxides are formed in the combustion chambers of piston engine cylinders at high combustion temperatures and are released into the atmosphere. Since nitrogen oxide emissions are harmful to the environment, the trend is to curb such emissions. [0003] It is well known that the addition of water to the combustion chamber along with the combustion air reduces the formation of nitrogen oxide emissions. This phenomenon is mainly based on the cooling effect of water. In practice, the introduction of water into the combustion chamber of a piston engine is carried out in three interchangeable ways, that is, water is introduced directly into the engine combustion chamber, water and fuel are introduced as a fuel emulsion, or water is introduced along the intake duct together...

Claims

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Application Information

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IPC IPC(8): F02M31/087F02M25/022F01N5/02F02B37/18F02MF02M25/028F02M25/07F02M31/04
CPCY02T10/126F01N5/02F02B37/18F02M31/08F02M25/0228Y02T10/121F02M35/042Y02T10/144F02M25/022Y02T10/16F02M25/0227F02M25/028Y02T10/12F02M31/042
Inventor J·胡普利
Owner WARTSILA FINLAND OY
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