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

A power generation system and waste heat recovery technology, applied in the fields of resources and environment, can solve the problems of reduced energy utilization, low power cycle efficiency, environmental thermal pollution, etc., and achieve the effects of reducing discharge temperature, improving thermal efficiency, and improving benefits

Inactive Publication Date: 2010-08-18
KUNMING UNIV OF SCI & TECH +1
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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 count

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

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Embodiment 1

[0035] Embodiment 1: For example, in a sinter cooling process of Kunming Iron and Steel Company, air cooling sinter is adopted, resulting in waste gas emission at about 350°C-400°C (flow rate is about 6x10 5 N m 3 / h), the conventional waste heat recovery power generation system using water as the working medium is now installed, which can obtain a net power generation capacity of 5000Kw, and the annual recoverable electricity is about 2.3x10 7 Kw.h, equivalent to an electricity price of 9.2 million yuan. After adopting the new technology of multi-stage evaporation organic Rankine cycle, the circulating working medium is n-hexane, three-stage evaporation, the evaporation pressure of the low-pressure stage is 1.41bar, and the corresponding evaporation temperature is 80°C. The evaporation pressure of the first stage is 7.44bar, and the corresponding evaporation temperature is 150°C. The evaporation pressure of the high-pressure stage is 24.2bar, and the corresponding evaporation...

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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, which is a medium and low temperature waste heat utilization process and power generation system, and belongs to the technical field of resources and environment. Background technique [0002] The industrial production process 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 fluid 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 gene...

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Application Information

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IPC IPC(8): F01K27/02F01K25/10F01K11/02
CPCY02P80/15
Inventor 王华李幼灵张竹明王辉涛冷婷婷
Owner KUNMING UNIV OF SCI & TECH
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