Waste heat recovery system and recovery method for LNG (Liquefied Natural Gas) automobile engine

Abstract

The invention discloses a waste heat recovery system and a recovery method for an LNG (Liquefied Natural Gas) automobile engine, which aim to solve the technical problem how to reasonably use heat dispersed by automobile exhaust and engine coolant, and additionally, the automobile fuel economy is effectively increased by using LNG fuel cold energy. The waste heat recovery system comprises an organic Rankine cycle system and an LNG fuel cold energy using and heating system, wherein the organic Rankine cycle system is used for recycling waste heat of engine exhaust and coolant, the organic Rankine cycle system comprises a conduction oil circulation loop and an organic working medium circulation loop, the conduction oil circulation loop comprises an exhaust and conduction oil heat exchanger, a conduction oil circulation pump and an evaporator, a conduction oil outlet of the evaporator is connected with a conduction oil inlet of the exhaust and conduction oil heat exchanger by virtue of the conduction oil circulation pump, and a conduction oil outlet is connected with a conduction oil inlet of the evaporator. According to the waste heat recovery system, the heat dispersed by the automobile exhaust and coolant is reasonably used, so that the engine waste heat is recycled, and additionally, the LNG cold energy is fully used.

Description

technical field [0001] The invention relates to LNG vehicle engine equipment, in particular to a waste heat recovery system for LNG vehicle engines and a recovery method thereof in the field of organic Rankine cycle utilizing waste heat energy. Background technique [0002] Liquefied Natural Gas (LNG) is a liquid formed when natural gas is purified and cooled to below -162 degrees Celsius. The components of LNG are purer than gaseous natural gas, and components such as dust, acid gas, and heavy hydrocarbons have been removed, and it is colorless, odorless, non-toxic and non-corrosive. Vehicles fueled by LNG to replace diesel vehicles can effectively reduce harmful gas and particle emissions. Compared with buses with diesel engines, LNG buses with natural gas engines reduce 99% of carbon monoxide, 83% of hydrocarbons, and 31% of nitrogen Oxygen compound emissions, no particulate matter and smoke emissions, and basically free of lead, sulfide, benzene, etc.; at the same time,...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to rationally utilize the heat lost by automobile exhaust and engine coolant, and utilize the cold energy of LNG fuel at the same time, so as to reduce the fuel consumption of automobiles, effectively reduce emissions, and reduce the impact on the environment. Pollution, providing a waste heat recovery system and recovery method for LNG automobile engines that can fully utilize the cold energy contained in LNG while recovering and utilizing engine waste heat

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