Multistage evaporation organic Rankine cycle waste heat recovery generation system and method thereof

Abstract

The invention relates to a multistage evaporation organic Rankine cycle waste heat recovery generation system and a process thereof. The multistage evaporation organic Rankine cycle waste heat recovery generation system is provided with an organic working medium waste heat boiler, a multistage organic turbine with an intermediate air supplementation port, a condenser, a water cooling tower, a draught fan and the like according to required generation capacity; the organic working medium waste heat boiler, the multistage organic turbine, the condenser, a liquid storage device, a vapor-liquid separator, various stages of working medium booster pumps, a cooling water circulating pump, the water cooling tower, a valve and other equipment and accessories are arranged and connected by pipelines; and the working medium charging quantity can be calculated according to the pipeline volume and R290, R245fa, n-pentane or n-hexane are metered and charged into a circulating pipeline. The invention can efficiently convert medium-low temperature waste gas waste heat into high-grade electric energy, improve the efficiency by 2-5 percent in comparison with single-stage evaporation organic Rankine cycle and remarkably improve the benefit of waste heat recovery.

Description

Technical field [0001] The invention relates to a multi-stage evaporative organic Rankine cycle waste heat recovery power generation system and a power generation process. It is a medium-low temperature waste heat utilization process and a power generation system, and belongs to the field of resources and environmental technology. Background technique [0002] Industrial production processes are often accompanied by a large amount of medium and low-temperature waste heat emissions. The waste heat emissions not only reduce energy utilization, but also cause thermal pollution to the environment. At present, water is usually used as the working fluid of the power cycle in the world, resulting in low efficiency of the medium and low temperature waste heat Rankine cycle (extremely low low temperature). Developed countries such as Japan and Israel have invested a lot of energy in recent years to study the use of organic Rankine cycle (ORC) power generation technology to efficientl...

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Problems solved by technology

[0002] In the process of industrial production, it is often accompanied by a large amount of medium and low temperature waste heat discharge. On the one hand, the waste heat discharge reduces the energy utilization rate, and also causes thermal pollution to the environment.

At present, water is usually used as the working medium of the power cycle in the world, resulting in low efficiency of the medium and low temperature waste heat Rankine cycle (low temperature is extremely low)

In recent years, developed countries such as Japan and Israel have invested a lot of energy in researching the use of Organic Rankine Cycle (ORC) power generation technology to efficiently recover medium and low temperature waste heat. Based on the recovery of waste heat, their thermoelectric conversion efficiency is generally not emphasized, especially for recycling At 400-500℃, the efficiency is not ideal. The main reason is that the existing ORC) systems use single-stage single-pressure evaporation, resulting in low power cycle efficiency.

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