Valuable ocean energy of "blue" energy
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Ocean energy is a general term for renewable energy contained in the ocean.
Including tidal energy, wave energy, tidal current energy (current energy), temperature difference energy and salt difference energy and so on. In a broad sense, ocean energy also includes offshore wind energy and solar energy.
Tidal energy and tidal current energy come from the gravitational changes of the moon and the sun to the earth, and other energies are generated by solar radiation. Ocean energy can be regarded as the enrichment of many kinds of energy in nature, and the development of ocean energy is more efficient than the development of those energy sources with low energy density.
The commonness of ocean energy is that it can be regenerated. In the age of the existence of the solar system, the gravitation and solar radiation of the stars are inexhaustible, so the ocean energy is inexhaustible.
The ocean is very rich in energy and generally exists in the vast ocean water body. Scholars have different estimates of ocean energy reserves, and there is a great disparity. Ocean energy exists near the coastline, which is an area with dense population, developed industry, high energy consumption and far away from traditional energy. In particular, the isolated overseas islands have only one kind of energy resource, the ocean energy.
Although the total amount is extremely rich, the ocean energy is scattered in the water body of the global ocean, and the energy reserves (density) per unit area or unit length and unit volume are small, so it is difficult to use effectively. The marine energy in the coastal area still has potential development value, while the ocean energy in the ocean can be far away from users and the environment is harsh, so it is difficult to develop and utilize. The energy of all kinds of ocean energy varies with the sea area and time, and each has its own statistical law. This brings difficulties to the development and utilization of ocean energy.
The equipment for the development of marine energy must be built in the ocean, facing the high pressure of the deep sea, the impact of surging waves and turbulent currents, the strong corrosive force of sea water and the fouling of marine life to the structure. This will inevitably increase the cost of ocean energy development.
Due to the limitations of marine energy development, although marine energy development has a history of several decades, it has not yet occupied its due position in the new alternative energy sources.
MEYGEN Tidal current Power Plant in the UK
Blue energy shows its own powers.
Marine energy is a renewable and clean energy, which does not consume fuel, produces no waste, waste liquid, waste gas, and does not need transportation. Whether the development of the ocean can produce new pollution or not, the impact on the environment is less than that of the traditional energy development industry, and the advantages outweigh the disadvantages. Some people call ocean energy "blue energy".
Schematic diagram of tidal energy power generation device
Tidal energy: tidal energy refers to the potential energy stored by periodic fluctuations of tidal water due to the tidal forces exerted by the moon and the sun on the earth. The technology of tidal energy power generation is generally through the construction of a tide-blocking dam, making use of the water level difference formed by the fluctuation of the tide to make the tide with a certain head flow through the hydraulic turbine installed in the dam and drive the generator to generate electricity through the rotation of the hydraulic turbine. the principle is similar to hydroelectric power. As the most mature ocean energy power generation technology, the traditional barrier tidal energy technology has been commercialized as early as decades ago.
Gui tidal power station
Tidal current energy: tidal current energy is the kinetic energy formed by the periodic horizontal movement of sea water caused by the tidal forces of the moon and the sun. Compared with tidal energy, tidal energy is another way to obtain energy from tides. Tidal current energy is mainly concentrated in the narrow entrances of straits, waterways and bays in the archipelago area. Due to the influence of coastal shape and seafloor topography, the velocity is high and the accompanying energy is huge. The power generation principle of tidal current energy is similar to that of wind power generation, that is, the kinetic energy of water flow is converted into mechanical energy, which is then converted into electrical energy.
MEYGEN Tidal current Power Plant in the UK
Wave energy: wave energy conversion device is a device that converts the kinetic energy and potential energy of sea surface waves into another form of energy (such as electric energy). Wave energy is a kind of energy transformed by wind energy. the wind blows through the ocean and transfers the energy to the sea water through the air-sea interaction to form waves and store the energy as potential energy and kinetic energy. Wave energy power generation is generated by using the mechanical energy of the longitudinal and transverse motion of the object under the action of waves, the change of wave pressure and the climbing of waves on the coast. its structure and working principle are various.
China's "Eagle" Wave Power Generation platform
Temperature difference energy: sea water temperature difference energy refers to the ocean thermal energy stored in the form of temperature difference between surface and deep sea water, and the main source of its energy is the solar radiation energy contained in the ocean. Ocean thermal energy reserves are huge. The ocean, which accounts for 71% of the earth's surface area, is the largest solar energy storage device on earth. In addition to power generation, the development of marine thermoenergy also has a broad development prospect in the production of fresh water, air conditioning and refrigeration, marine aquaculture and hydrogen production.
Salt difference energy: salt difference energy mainly exists at the junction of river and sea, which refers to the chemical potential difference energy between seawater and fresh water or between two kinds of seawater with different salt concentration, which exists in the form of chemical energy. Salt differential energy power generation technology mainly includes slow pressure osmosis method, reverse electrodialysis method and steam pressure method. Among them, there are many researches on slow pressure osmosis and reverse electrodialysis, and their core technology is mainly in the study of osmotic membrane, and the international salt difference energy technology is still in the stage of principle research.
Qiao offshore wind farm
"Blue" can be valuable and has a bright future.
Lamma Island, Hong Kong
In the development of marine resources, marine energy resources as a strategic resource has been widely recognized by the international community.
The European Union estimates that the marine energy industry will create nearly 40,000 jobs by 2035. It regards the development of marine energy as a strategic goal in its blue growth plan and regards it as an important indicator of marine strength. The marine energy industry has shown a trend of rapid growth in countries such as the United Kingdom. The United States also takes new energy investment, including marine energy, as one of the important measures to stimulate US economic growth. The development of ocean energy has become the strategic need of international competition and the battlefield to seize the commanding heights of international strategy.
Ocean energy is an important part of natural resources, which has the advantages of great development potential, sustainable utilization, green cleaning and so on. China is rich in marine energy resources, with a wide sea area, a long coastline and many islands, which has favorable conditions for large-scale development and utiliza
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