Low-temperature Rankine circulation system employing non-azeotropic mixed working medium variable components

Abstract

The invention relates to a low-temperature Rankine circulation system employing non-azeotropic mixed working medium variable components. An evaporator is provided with a heat source inlet, a heat source outlet, a basic component working medium inlet and a basic component working medium outlet. The inlet of a steam-liquid separator is connected with the working medium outlet of the evaporator; the inlet of a steam turbine or an expansion machine is connected with a steam outlet for steam in the upper part of the steam-liquid separator; a power generator is coaxially connected with the steam turbine or the expansion machine; the inlet of a preheater is connected with an outlet for liquid in the lower part of the steam-liquid separator; a high-temperature liquid outlet is connected with the inlet of a throttle valve; the outlet of the preheater is connected with the working medium inlet of the evaporator; the working medium inlet is connected with the outlet of a circulating pump; the inlet of a mixer is connected with the steam outlet of the steam turbine or the expansion machine and the outlet of the throttle valve respectively; the low-temperature working medium inlet of a condenser is connected with the low-temperature working medium outlet of the mixer; the working medium liquid outlet of the condenser is connected with the inlet of the circulating pump; and the cold source inlet and the cold source outlet of the condenser are connected with a cold source. Through the low-temperature Rankine circulation system, the structure of the steam turbine can be simplified, the cost can be reduced, and the circulation efficiency can be improved obviously.

Description

technical field [0001] The invention relates to a low-temperature Rankine cycle system. In particular, it relates to a low-temperature Rankine cycle system using non-azeotropic mixing and mass-changing components. Background technique [0002] Low-temperature heat sources generally refer to low-grade energy sources with a temperature below 150°C. There are many types of this type of heat energy, such as new energy sources such as solar energy and geothermal energy, and various waste heat. Low-grade waste heat resources are also various and huge in quantity, such as a large amount of low-temperature flue gas, hot water, steam, etc. produced in the production process of steel, petrochemical, and cement industries. Most of these low-grade waste heat resources cannot be directly reused. Energy, which can reduce energy consumption and reduce environmental pollution, so as to achieve energy saving and emission reduction. Organic Rankine cycle uses low-boiling-point organic worki...

AI Technical Summary

Problems solved by technology

The use of non-azeotropic mixed working fluid, due to its variable temperature evaporation characteristics, can be better matched with variable temperature heat sources, thereby reducing irreversible losses, increasing the average endothermic temperature, and recovering heat from heat sources to the maximum extent. Temperature glides, while increasing the average exotherm temperature, so the thermal efficiency is not high

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