Small temperature difference thermal electric generator

Abstract

The invention discloses a small temperature difference thermal electric generator, which consists of a cyclic electric generating system and a refrigerating system, wherein a pipeline which exchanges heat with an evaporator of the refrigerating system is connected in parallel between a steam turbine and a working medium pump of the cyclic electric generating system, a pipeline which exchanges heat with a condenser of the refrigerating system is connected in parallel between the working medium pump and a heat exchanger of the cyclic electric generating system, and a small temperature difference thermal electric generating system is coupled with the refrigerating system. The device of the invention uses the condenser of the refrigerating system as a preheater of a cyclic working medium in a cold mode of the refrigerating system, and avoids the dissipation of the heat of the condenser into the environment, or the device uses the evaporator of the refrigerating system as a cold source of the condenser of the small temperature difference thermal electric generating system in a hot mode of the refrigerating system for reducing the cold source temperature of the small temperature difference thermal electric generating system, so the temperature different gradient of the cyclic working medium is improved, and the electric generating efficiency of the temperature difference thermal electric generating system is improved. The device of the invention has low investment in an early stage, and realizes the conversion of the small temperature difference thermal electric generator from large scale to small scale.

Description

technical field [0001] The invention relates to a thermal power generation device with small temperature difference, belonging to the technical field of thermal power generation. Background technique [0002] Small temperature difference thermal power generation technology is a technology that utilizes the temperature difference between a low-temperature heat source and a cold source, uses a low-boiling point working fluid as a circulating working fluid, and uses a high-temperature heat source to heat and evaporate the steam generated by the circulating working fluid to drive turbine power generation on the basis of the Rankine Cycle. Technology. Due to the reduction of the heat source temperature conditions at the high temperature end, it is theoretically possible to build power stations in areas with regional temperature differences or large periodic temperature fluctuations, such as the use of groundwater heat sources and cold air as cold sources in alpine areas, using so...

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