Geothermal energy gradient utilization combined heat and power generation device and method

Abstract

The invention provides a geothermal energy gradient utilization combined heat and power generation device and method. A geothermal well, a gas-liquid separator, a turbine, a condenser, a first-level evaporator, an expander, a heat exchanger and a recharge well are included. A geothermal water outlet of the geothermal well is connected with an inlet of the gas-liquid separator. A high-temperature water steam outlet of the gas-liquid separator is connected with an inlet of the turbine, and an outlet of the turbine is connected with an inlet of the recharge well through the condenser. A high-temperature liquid outlet of the gas-liquid separator is connected with a water inlet of the first-level evaporator, a high-temperature organic working medium outlet of the first-level evaporator is connected with an inlet of the expander, and a low-temperature organic working medium outlet of the expander is connected with a low-temperature organic working medium inlet of the first-level evaporator.A low-temperature water outlet of the first-level evaporator is connected with a heat side inlet of the heat exchanger, and a heat side outlet of the heat exchanger is connected with the inlet of therecharge well. The heat exchanger is further connected with external equipment. The system utilizes the part of hot water, comprehensive gradient utilization of geothermal energy is achieved, and theenergy utilization efficiency of the geothermal energy is improved; and meanwhile, power generation and heat supply are conducted, and combined heat and power generation is achieved.

Description

technical field [0001] The invention relates to the technical field of geothermal power generation, in particular to a heat and power cogeneration device and method for cascaded utilization of geothermal energy. Background technique [0002] Geothermal energy is a green, low-carbon, recyclable and renewable energy. It has the characteristics of large reserves, wide distribution, cleanness, environmental protection, stability and reliability. It is a feasible and competitive clean energy. my country is rich in geothermal resources, with huge market potential and broad development prospects. Accelerating the development and utilization of geothermal energy is not only of great significance for adjusting the energy structure, saving energy and reducing emissions, and improving the environment, but also has a significant pulling effect on cultivating emerging industries, promoting new urbanization, and increasing employment. It is an important measure to promote the construction...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a cogeneration device and method for cascade utilization of geothermal energy, which solves the problem of waste of heat energy in the low-grade tail water at the outlet of the existing geothermal power generation flash tank

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