What is clean energy?
Clean energy and non-clean energy are distinguished according to the degree of impact of the energy consumption process on the human environment. Unclean energy refers to the energy that emits a large number of greenhouse gases, harmful gases, and liquid and solid wastes that are harmful to the environment, such as coal, oil, etc., which are extensively used. In contrast, clean energy refers to the energy that does not or rarely emits harmful substances in the process of production and use.
Clean energy generally includes two types: one is renewable energy, such as water energy, solar energy, wind energy, geothermal energy, ocean energy, etc., which can be recovered and replenished by themselves after being consumed, and will not produce or rarely produce pollutants, this type of energy is also called Class I clean energy; the other is non-renewable low-polluting energy (such as natural gas) and fossil fuels (such as clean coal, clean oil, etc.) treated with clean energy technology. Energy is called Class II clean energy. In general, clean energy refers to Class I clean energy.
Several typical clean energy sources
Solar energy: Solar energy refers to the conversion of light energy from the sun into other forms of energy, such as thermal energy, electrical energy, chemical energy, etc. The utilization of solar energy is mainly concentrated in solar power generation, solar heating, etc. With the advancement of science and technology, solar photovoltaic power generation is being used on a large scale. Our country's solar energy resources are very rich. In addition to power generation, the current utilization of solar energy includes solar collectors, solar greenhouses, solar drying, and solar cooling.
Ocean energy: The general term for the huge renewable energy contained in the ocean is called ocean energy, which mainly includes seawater temperature difference energy, tidal energy, wave energy, ocean current energy (tidal current energy), seawater salinity energy, etc. Among these energy sources, in addition to tidal energy and tidal current energy, which originate from the gravitational action between planets, other types of energy are derived from solar radiation energy. Ocean energy mainly uses the energy stored in the ocean to generate electricity, and a development scenario is expected. Although ocean energy is widely distributed, clean and pollution-free, its energy density is low and the requirements for the region are high, so it is difficult to develop and utilize.
Wind energy: Wind energy is the kinetic energy generated by a large amount of airflow on the earth's surface. It is greatly affected by terrain factors. Therefore, most of the world's wind energy resources are concentrated in the shrinking areas of coastal and open continents. Wind energy can be converted into different forms of energy, such as mechanical energy, electrical energy, thermal energy, etc., according to different needs. At present, the main utilization method is wind power generation. Wind energy is also renewable, non-polluting energy with huge reserves. However, due to the large size of its utilization devices, many consumables, and high investment, the wind energy utilization technology has a certain complexity.
Hydrogen energy: Hydrogen energy refers to the energy released by the reaction of hydrogen and oxygen. Hydrogen energy is the chemical energy of hydrogen, which mainly occurs in the form of a combined state on Earth, and is the most widely distributed substance in the universe. Hydrogen energy has the characteristics of high exothermic efficiency, the product after combustion is only water, and will not cause environmental pollution, so it is good to clean energy when used.
Nuclear energy: Nuclear energy refers to the energy released during the fission or fusion of atomic nuclei, also known as atomic energy. Nuclear power generation is low-carbon and environmentally friendly, and there are abundant nuclear energy reserves on the earth, but the reprocessing of nuclear power waste and the peaceful use of nuclear energy still have a long way to go.
Geothermal energy: Geothermal energy is a huge amount of heat that exists inside the earth. Volcanic eruptions, hot springs, etc. are the manifestations of its release, which can be used to generate electricity.
Clean energy fully meets the needs of sustainable development and can effectively promote the development of a green economy. It is currently leading the global trend of clean energy, accelerating the pace of energy transformation, and has broad prospects.