Internal combustion engine vapor supercharging waste heat recovery system

Abstract

The invention discloses an internal combustion engine vapor supercharging waste heat recovery system. According to the technical scheme, internal combustion engine cylinder sleeve cooling water is in tandem connection with the cold end of a thermoelectric generator, an expansion machine, a preheater and a circulating water pump sequentially through pipelines to form into a cooling water heat utilization circulating system; air performed air suction compression through a compressor is sent to an internal combustion engine; an exhaust pipe of the internal combustion engine is in tandem connection with the thermal end of the thermoelectric generator, the gas side of an evaporator sequentially to form into an exhaust thermal utilization system; a preheater is in tandem connection with the working medium side of the evaporator, a turbine expansion machine, the working medium side of the condenser and a working medium pump sequentially to form into an organic rankine cycle system; the compressor is in shaft connection with a turbo machine to form into a turbosupercharger. The internal combustion engine vapor supercharging waste heat recovery system has the advantages of breaking the temperature limit of the recycle source of the organic rankine cycle, recycling the waste heat energy of the exhaust and the cooling water, achieving efficient utilization of the waste heat, avoiding the condition that the exhaust energy is not enough to drive a supercharging system when the load is low, increasing the effective working range of the supercharging system and achieving the purpose of efficiently recycling the waste heat energy.

Description

technical field [0001] The invention belongs to the waste heat utilization technology of an internal combustion engine, and in particular relates to a system for recovering waste heat from steam pressurization of an internal combustion engine. Background technique [0002] With the increasing shortage of energy and the increasingly severe environmental problems, the energy saving and emission reduction of internal combustion engines has attracted worldwide attention. The use of organic Rankine cycle (ORC) technology to recover waste heat from diesel engines is a current research hotspot. The ORC cycle has high thermal efficiency and safety, and has a simple structure. However, the decomposition temperature of the working fluid used is required to be lower than 350°C, while the exhaust temperature of the internal combustion engine is generally as high as 500-600°C. Higher temperature may cause the decomposition of organic working fluid, which is one of the key points restric...

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Problems solved by technology

However, the problem is that the installation of the turbine will increase the exhaust back pressure of the internal combustion engine, resulting in greater exhaust loss and a decrease in the output power of the internal combustion engine.

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