Waste heat recycling system and method based on organic Rankine recycle and organic flash recycle

Abstract

The invention relates to a waste heat recycling system and method based on organic Rankine recycle and organic flash recycle. Liquid organic media output by a condenser are pressurized through a low-pressure pump, then introduced into a heater and subjected to constant pressure heating in the heater to become saturate liquid media, and the saturate liquid media are fed into a flash tank and subjected to the throttling action in the flash tank to become a gas-liquid two-phase mixture through flash vaporization, the liquid media are pressurized through a high-pressure pump and then fed into an evaporator to carry out heat exchange with waste heat, and saturate steam is fed into a mixer; and superheated steam or saturate steam at an outlet of the evaporator enters a high-pressure expanding machine to do work, exhaust steam of the high-pressure expanding machine is fed into the mixer to be mixed with the saturate steam from the flash tank, the mixed steam is fed into a low-pressure expanding machine to do work, and exhaust steam of the low-pressure expanding machine is fed into a condenser and cooled into liquid working media by cooling media in the condenser. By means of the waste heat recycling system and method based on the organic Rankine recycle and the organic flash recycle, effective energy loss in the organic flash recycle and the organic Rankine recycle is reduced, and thepure electric power output and the waste heat energy recycling capability of the system are improved.

Description

technical field [0001] The invention belongs to the field of waste heat recovery, and is a waste heat recovery system and method based on an organic Rankine cycle and an organic flash cycle. Background technique [0002] The effective use of waste heat and renewable energy is of great significance to reduce the use of fossil fuels and alleviate global environmental problems. The Organic Rankine Cycle (ORC), which uses low-boiling-point organic matter as a circulating working fluid, is an energy recovery technology that converts low-level heat energy into mechanical energy or electrical energy and then outputs it. At present, the waste heat recovery system based on organic Rankine cycle has attracted the attention of scholars at home and abroad and has been widely used due to its high system efficiency, compact system configuration, low investment cost and good operation stability. In particular, the organic Rankine cycle-based waste heat recovery system has great applicatio...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the problem of the effective energy loss of the organic working fluid evaporation process in the above-mentioned Organic Rankine cycle and the problem of the effective energy loss of the saturated liquid throttling process in the organic flash cycle, and provide a method based on the Organic Rankine cycle and the organic flash cycle. The waste heat recovery system and method of the steam cycle, combined with the respective advantages of the traditional organic Rankine cycle waste heat recovery system and the organic flash cycle waste heat recovery system, can improve system efficiency, increase the net electric power output of the system, and improve the waste heat energy recovery and utilization capacity of the system

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