Supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device

Abstract

The invention relates to a supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device which comprises a subcritical ORC module, a supercritical ORC module and a supercritical heat accumulating module. The supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device is mainly composed of a condenser, a working medium storage tank, an electromagnetic valve, a working medium pump, an expansion machine, a preheater, a postprocessor, a supercritical heat accumulator, an overheating evaporator, a control unit and the like. The exhaust temperature is stabilized within a certain range by the supercritical heat accumulator, then exhaust enters the postprocessor, and the postprocessor is made to keep high purification efficiency and lower pollution emission under most of the working conditions of an engine. Meanwhile, organic Rankine cycle is used for recovering the heat of the exhaust to improve the utilization rate of energy. The supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device has the advantages that the organic Rankine cycle is used for achieving low pollution emission and efficient energy utilization.

Description

technical field [0001] The invention belongs to the technical field of organic Rankine cycle low-quality energy utilization, and specifically relates to the development of a supercritical regenerative organic Rankine cycle exhaust heat comprehensive utilization device to achieve the beneficial effects of stabilizing the inlet temperature of the engine afterprocessor and improving the energy utilization rate . Background technique [0002] Low-temperature heat source refers to relatively low-grade heat energy, generally with a temperature lower than 200°C. There are many kinds of these energy sources, including renewable energy such as solar energy, various industrial waste (waste) heat, geothermal energy, biomass energy, and ocean temperature difference energy. The total amount of these resources is huge. Taking industrial waste heat as an example, 50% of the heat energy used by human beings is finally discharged directly in the form of low-grade waste heat. Utilizing and ...

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Problems solved by technology

The inherent transient nature of the thermal state of the exhaust gas of a vehicle internal combustion engine brings two key problems: 1) Inefficient utilization of waste heat mechanical energy and complexity of control caused by the sensitivity of the organic Rankine cycle waste heat recovery system to match the heat source ; 2) Low conversion rate of harmful substances and low waste heat utilization rate of exhaust gas caused by narrow suitable window of post-treatment inlet temperature and mismatch with real-time exhaust temperature

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