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CRYOGENIC EXHAUST GAS RECIRCULATION COOLING UTILIZING LIQUEFIED NATURAL GAS

IP.com Disclosure Number: IPCOM000238877D
Publication Date: 2014-Sep-23
Document File: 4 page(s) / 50K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique to cool exhaust gas recirculation (EGR) and simultaneously vaporize liquefied natural gas (LNG) in a dual fuel locomotive engine. The technique includes utilization of cryogenic LNG on the dual fuel locomotive engine to cool the EGR on the same locomotive engine. A variant of the invention includes a heat engine wherein energy is transferred from high temperature EGR to low temperature LNG through the engine. Large temperature difference in fluid is important for efficient thermodynamic efficiency of the heat engine.

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CRYOGENIC EXHAUST GAS RECIRCULATION COOLING UTILIZING LIQUEFIED NATURAL GAS

 

BRIEF ABSTRACT

The invention proposes a technique to cool exhaust gas recirculation (EGR) and simultaneously vaporize liquefied natural gas (LNG) in a dual fuel locomotive engine. The technique includes utilization of cryogenic LNG on the dual fuel locomotive engine to cool the EGR on the same locomotive engine. A variant of the invention includes a heat engine wherein energy is transferred from high temperature EGR to low temperature LNG through the engine. Large temperature difference in fluid is important for efficient thermodynamic efficiency of the heat engine.

KEYWORDS

Liquefied natural gas, exhaust gas recirculation, dual fuel locomotive engine, heat exchange


DETAILED DESCRIPTION

Generally, for exhaust gas recirculation (EGR) heat rejection and simultaneous liquefied natural gas (LNG) vaporization in a dual fuel engine require two to three heat exchangers.

A conventional technique includes an ethylene glycol loop to gain heat from engine coolant system which then rejects heat to the LNG. This requires two heat exchangers for the ethylene glycol loop. Further, EGR is cooled using an EGR cooler, which circulates water with the engine cooling system. This results in a total of three heat exchangers. However, use of several numbers of heat exchangers makes the configuration heavy and complex.

Therefore, there is a need for a method and technique for efficient heat exchange between LNG and EGR in a locomotive engine.

The invention proposes a technique to cool exhaust gas recirculation (EGR) and simultaneously vaporize liquefied natural gas (LNG) in a dual fuel locomotive engine. The technique includes utilization of cryogenic LNG on the dual fuel locomotive engine to cool the EGR on the same locomotive engine. A variant of the invention includes a heat engine wherein energy is transferred from high temperature EGR to low temperature LNG through the engine. Large temperature difference in fluid is important for efficient thermodynamic efficiency of the heat engine.

The technique involves a system optimization in which the LNG is vaporized by...