Supercritical organic Rankine double-circulation waste heat recovery system

Abstract

The invention relates to a supercritical organic Rankine dual cycle waste heat recycling system and belongs to the field a common heat exchange. The system comprises a medium temperature overheater, a medium temperature expander, a medium temperature condenser, a medium temperature compression pump, a medium temperature steam generator, a medium temperature expander crankshaft, a medium temperature output power device, a low temperature overheater, a low temperature expander, a low temperature condenser, a low temperature compression pump, a low temperature steam generator, a low temperature expander crankshaft, a low temperature output power device, an exhaust shunt valve, a low temperature shunt valve and so on. The connection of the elements is as follows: the medium temperature steam generator, the medium temperature overheater, the medium temperature expander, the medium temperature condenser and the medium temperature compression pump are connected in turn to form a loop to form a medium Rankine cycle; and the low temperature overheater, the low temperature expander, the low temperature condenser, the low temperature compression pump, the low temperature shunt valve and the low temperature steam generator are connected in turn to form a loop to form a low temperature Rankine cycle. The system is suitable to be used on road automotive engines which are variable in operating conditions and diversified in energy states for recycling waste heat.

Description

technical field [0001] The invention relates to a supercritical organic Rankine double-cycle waste heat recovery system, which belongs to the field of general heat exchange (F28). Background technique [0002] Energy saving and environmental protection of automobiles are the main problems faced by the research and development of automobile technology at present. Since the engine can only convert a small part of the fuel energy into mechanical energy, and the rest of the fuel energy is dissipated into the atmosphere through the cooling system, lubrication system and exhaust, so the fuel economy can be improved by rational use of engine waste heat. [0003] At present, the utilization methods for the recovery of waste heat from automobiles have their own limitations. The main utilization methods include: turbocharging technology, waste heat air conditioning, and power generation using waste gas energy temperature difference. However, supercharging technology can only use part...

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Problems solved by technology

However, supercharging technology can only use part of the energy of the exhaust gas, and the exhaust gas at the outlet of the turbine still has a high temperature, which has reuse value; waste heat air conditioning technology has no work output, and the energy utilization rate is low; thermoelectric power generation is limited With the development of materials and other technologies, the thermoelectric conversion efficiency is low

[0004] At present, the Rankine cycle waste heat recovery system used on industrial boilers and heavy-duty diesel engines for ships and buildings cannot be used for waste heat recovery of vehicle engines.

This is because the waste heat recovery system of the above type requires relatively stable waste heat source energy, small changes in working conditions, and usually a large system volume, while vehicle engines have variable operating conditions and require a small system volume and weight , so the ordinary Rankine cycle waste heat recovery system cannot meet the waste heat recovery requirements of vehicle engines

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