How to develop geothermal energy

Geothermal energy is a kind of renewable energy source from the heat energy inside the earth, which has the advantages of cleanliness, stability and sustainability. With the optimization of global energy structure and the enhancement of environmental awareness, the development and utilization of geothermal energy has been paid more and more attention. This paper will introduce the types, development methods and challenges of geothermal energy.

I. Types of Geothermal Energy

Geothermal resources can be divided into three types according to different temperatures: high temperature geothermal, medium temperature geothermal and low temperature geothermal. High temperature geothermal (temperature higher than 150℃) is mainly used for geothermal power generation; Medium temperature geothermal (90℃~150℃) is suitable for industrial heating, greenhouse planting, etc. Low temperature geothermal (below 90℃) is widely used in building heating, hot spring bathing and other fields.

Second, the development mode of geothermal energy

1. Drilling technology
The core link of geothermal development is drilling. Drilling equipment is used to drill holes in the earth's crust to lead geothermal fluid (hot water or steam) out of the surface. The drilling depth depends on the burial of geothermal resources, generally ranging from several hundred meters to several thousand meters.

2. Geothermal power generation system
There are three main technologies for using geothermal energy to generate electricity: dry steam power generation, flash power generation and double-cycle power generation. Among them, dual-cycle power generation is widely concerned because it is suitable for medium and low temperature geothermal resources.

3. Geothermal heating system
In urban heating, ground source heat pump technology is widely used. It absorbs geothermal energy through circulating liquid in underground pipeline, and then heats or cools buildings through heat pump system, which has the characteristics of high efficiency and energy saving.

4. Comprehensive utilization and recharge technology
In order to improve the utilization rate and reduce the impact on the environment, geothermal development often adopts the method of "pumping and irrigation", that is, after pumping geothermal water, the used water is reinjected into the ground to maintain the pressure and sustainability of geothermal reservoirs.

Third, the challenges faced by geothermal development

Although geothermal energy has a broad prospect, its development still faces many challenges. First, exploration costs are high and risks are high, geothermal resources are unevenly distributed, and exploration technology requirements are high; Second, improper development may lead to geological disasters, such as inducing earthquakes; Third, geothermal fluid often contains harmful gases such as hydrogen sulfide, which needs environmental protection treatment.

Fourth, the future development direction

In the future, with the progress of science and technology and the strengthening of policy support, geothermal energy will occupy a more important position in the energy structure. Technologies such as artificial intelligence and big data will help the accurate exploration and efficient development of geothermal resources. In addition, the multi-energy complementary mode of geothermal energy and other energy sources will also become the development direction.

In a word, geothermal energy, as a clean and efficient renewable energy, its development and utilization is of great significance to realize the goal of energy transformation and sustainable development. Through technological innovation and scientific management, it is believed that geothermal energy will play a greater role in the future energy system.