Geothermal power generation The highest use of geothermal energy - geothermal energy

Geothermal resources refer to the renewable heat energy stored in the earth's interior, which is generally concentrated in the tectonic plate margins, and originated from the Earth's molten magma and the decay of radioactive materials. Geothermal resource is a very valuable comprehensive mineral resource, which has many functions and wide uses. Geothermal utilization forms can be divided into two categories: geothermal power generation and direct utilization. Geothermal power generation refers to the use of geothermal steam power and heat energy for power generation, with long use time throughout the year, safe and reliable, environmental protection and non-polluting and sustainable characteristics.

Geothermal power generation is the most important way of geothermal energy utilization. Geothermal power generation is the use of steam thermal energy in the steam turbine into mechanical energy, and then drive generators to generate electricity. The systems that convert the heat energy carried by geothermal fluid into electric energy can be divided into geothermal flash evaporation electric system, geothermal dual-working medium cycle power generation system, geothermal full flow power generation system, geothermal dry steam power generation system and geothermal combined power generation system. The details are as follows:

(1) geothermal flash evaporation electric system

The geothermal flash evaporation electric system is a system in which the geothermal fluid in the geothermal well is first sent to the flash evaporator for flash evaporation, and then the generated steam is introduced to the expansion machine for power generation.

What is geothermal power technology? Geothermal power generation The highest use of geothermal energy - geothermal energy

Working principle: First of all, the dry steam is drawn from the steam well, is purified first, and the solid impurities contained in the separator are separated, and then the steam can be passed into the turbine to do work and drive the generator to generate electricity. The steam after work can be discharged directly into the atmosphere; It can also be used for heating processes in industrial production.

Application: This system is mostly used in occasions where the non-condensable gas content in geothermal steam is very high, or comprehensively used in industrial and agricultural production and people's life.

What is geothermal power technology? Geothermal power generation The highest use of geothermal energy - geothermal energy

(2) Geothermal dual-medium cycle power generation system

The geothermal dual-working medium cycle power generation system is composed of geothermal fluid cycle and low-boiling working medium power generation cycle. It is a system that uses geothermal fluid to heat low-boiling working medium in heat exchanger, vaporizes it into steam, and then introduces it into expander to do work and power generation.

In this kind of power generation system, the medium with low boiling point usually uses two kinds of fluids; One is to use geothermal fluid as heat source; The other is to use low boiling point working fluid as a working medium to complete the conversion of thermal energy of underground hot water into mechanical energy. The so-called dual-cycle geothermal power generation system is thus named. Commonly used low boiling point working substances are chloroethane, n-butane, isobutane, freon-11, freon-12 and so on.

Advantages: High thermal efficiency using low temperature potential heat energy: compact equipment, small turbine size; It is easy to adapt to underground hot water with complex chemical composition.

Disadvantages: It is not as easy to use the hybrid evaporator and condenser as the expansion method; The heat transfer of most low-boiling working medium is worse than that of water, so a large metal heat transfer area is needed in this way. Low boiling point working medium price is high, the source is not wide, some low boiling point working medium also flammable, explosive, toxic, unstable, corrosion of metal and other characteristics.

What is geothermal power technology? Geothermal power generation The highest use of geothermal energy - geothermal energy

(3) geothermal full flow power generation system

The geothermal full flow power generation system is a system that directly introduces the geothermal fluid from the geothermal well into the expander for power generation.

What is geothermal power technology? Geothermal power generation The highest use of geothermal energy - geothermal energy

(4) geothermal dry steam power generation system

Geothermal dry steam power generation system is a system that directly introduces geothermal dry steam from geothermal Wells into expander for power generation.

First of all, the dry steam is drawn from the steam well, is purified first, and the solid impurities are separated by the separator, and then the steam can be passed into the turbine to do work and drive the generator to generate electricity. The steam after work can be discharged directly into the atmosphere; It can also be used for heating processes in industrial production.