Replacement system of organic Rankine cycle low-temperature power generation working medium and replacement method thereof

Abstract

The invention provides a replacement system of an organic Rankine cycle low-temperature power generation working medium and a replacement method thereof. The replacement system of an organic Rankine cycle low-temperature power generation working medium comprises a vacuum pump, a booster pump, a working medium hold-up vessel and a fluid reservoir, wherein the output end of the vacuum pump is connected to the input end of the booster pump by a first valve; the output end of the booster pump is connected to the steam generator of a circulating system by a fourth valve; the booster pump is connected to the working medium hold-up vessel by a third valve; the other end of the working medium hold-up vessel is connected to the fluid reservoir by a second valve; and meanwhile, the fluid reservoir is also respectively connected with the vacuum pump and the condenser of the circulating system. When working medium needs to be injected into the low-temperature power generation system of the organic working medium, air is extracted from the circulating system by the vacuum pump to cause the system to generate vacuum degree; the working medium is injected into the fluid reservoir by differential pressure to inject the working medium; and when the low-temperature power generation system halts and needs to recover the working medium, and the working medium in the fluid reservoir is injected back to the working medium hold-up vessel by the booster pump, thereby recovering the working medium.

Description

technical field [0001] The invention belongs to low-temperature thermal energy utilization and power engineering, in particular to an organic Rankine cycle low-temperature power generation working medium replacement system and a replacement method thereof. Background technique [0002] Primary energy sources such as coal, oil, and natural gas are becoming increasingly depleted. While seeking new energy sources, human beings are also optimizing and improving the current energy utilization structure. In recent years, my country's industrialization process has accelerated, resulting in more waste heat resources generated in the production process of industrial products such as chemicals and building materials. If these waste heat are directly discharged into the environment, it will cause energy waste and environmental thermal pollution. In addition, there are abundant renewable low-temperature heat sources such as solar energy and geothermal energy in nature. Therefore, the r...

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Problems solved by technology

The organic Rankine cycle, because the working medium used in it is expensive and easy to volatilize, and some working medium is also toxic to a certain extent, which is harmful to the human body and the environment. Therefore, leakage is not allowed during the normal operation of the unit, so it is not necessary Supplementary refrigerant

However, when shutting down for maintenance, the organic working medium in the system must be recovered, and the stored medium must be input into the system without leakage when starting up and the air in the system must be discharged, otherwise the oxygen in the air will corrode the components of the system and cause the system to The circulation cannot be performed normally; the leakage of working fluid will greatly increase the cost of use

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