Single-screw expander medium and low temperature geothermal power generating system with added lubricating oil cycle loop

Abstract

The invention relates to a single-screw expander medium and low temperature geothermal power generating system with an added lubricating oil cycle loop. The system is composed of a single-screw expander organic Rankine cycle loop module, a single-screw expander lubricating oil cycle loop module, a geothermal source cycle loop module, a cooling system cycle loop module and a power generating system module. A single-screw expander has the advantages of being suitable for the power range of medium and low temperature geothermal power generation, adaptable to wet steam to enter the expander to expand with liquid so that internal leakage of the expander can be reduced, and the system fully utilizes the characteristics of the single-screw expander, the high pressure organic working medium steam generated under heating of medium and low temperature geothermal sources is made to work through the expansion of the high pressure organic working medium steam to drive a power generating set, therefore, high heat efficiency is obtained, and power generating capacity is improved. The system reduces the high risks of the geothermal temperature to geothermal resource exploration and the difficulty of exploring and recharging geothermal resources, effectively uses the potential heat of working media, improves the utilization rate of energy resources and the cycle heat efficiency of the geothermal power generating system, and reduces cycle irreversible loss.

Description

technical field [0001] The invention relates to a single-screw expander with added lubricating oil circulation loop, relates to the field of medium and low-temperature geothermal power generation systems, and in particular to a medium-low temperature geothermal power generation system with a single-screw expander with increased lubricating oil circulation loop. Background technique [0002] Geothermal power generation is the main way to utilize geothermal energy. At present, geothermal power generation at home and abroad is mainly based on high-temperature geothermal sources, but less than 1 / 4 of the geothermal sources in the world are high-temperature geothermal sources. Therefore, the research on the field of medium-low temperature geothermal resource power generation has important theoretical significance and economic value. [0003] At present, geothermal power generation systems are mainly divided into dry steam geothermal power generation systems, flash geothermal powe...

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Problems solved by technology

The system consists of five parts: single-screw expander organic Rankine cycle module, single-screw expander lubricating oil cycle module, geothermal source cycle module, cooling system cycle module and power generation system module; and temperature range distribution on geothermal power generation constraints, focusing on the characteristics of the wide distribution of medium and low temperature geothermal resources in the process of power generation is not easy to use, solve the defects in the working performance of the expander and improve the efficiency of the expander, and then improve the circulation thermal efficiency of the geothermal power generation system and reduce the circulation. Irreversible loss and increase the reliability of system operation

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