Advantages of renewable energy

From Baidu Encyclopedia:

Renewable energy is an important energy resource, the development and utilization of renewable energy has the following important significance:

1, the development and utilization of renewable energy is the implementation of the scientific outlook on development, the construction of resource-saving society, the realization of the basic requirements of sustainable development. Adequate, safe and clean energy supply is the basic guarantee for economic development and social progress. China has a large population, a low level of per capita energy consumption, and great pressure on the growth of energy demand, and the contradiction between energy supply and economic development is very prominent. Fundamental solution to China's energy problems, and constantly meet the needs of economic and social development, environmental protection, sustainable development, in addition to vigorously improve energy efficiency, accelerate the development and utilization of renewable energy is an important strategic choice, but also the implementation of the scientific concept of development, the construction of resource-saving society's basic requirements.

2, the development and utilization of renewable energy is an important measure to protect the environment and respond to climate change. At present, China's environmental pollution problems are prominent, fragile ecosystems, large-scale exploitation and use of fossil energy on the environment has a great impact, especially in China's energy consumption structure in the proportion of coal is high, carbon dioxide emissions grow faster, a greater impact on climate change. Renewable energy is clean and environmentally friendly, and its development and utilization do not increase greenhouse gas emissions. The development and utilization of renewable energy is very important to optimize the energy structure, protect the environment, reduce greenhouse gas emissions, and respond to climate change.

3, the development and utilization of renewable energy is an important measure to build a new socialist countryside. Rural areas are currently the weakest areas of China's economic and social development, the energy infrastructure is backward, there are still about 11.5 million people without electricity supply, many rural living energy is still mainly dependent on straw, firewood and other biomass inefficient direct combustion of the traditional way of utilization to provide. Rural areas are rich in renewable energy resources, and accelerating the development and utilization of renewable energy can, on the one hand, make use of local resources to solve the problems of power supply in remote areas and rural residents' daily energy use in accordance with local conditions, and, on the other hand, convert biomass resources in rural areas into commercial energy so that renewable energy can become a featured industry in rural areas, thereby effectively extending the agricultural industry chain, improving agricultural efficiency, increasing farmers' incomes and improving the rural environment, as well as promoting the economy and the rural environment in rural areas. On the other hand, it can convert biomass resources in rural areas into commercial energy, making renewable energy a specialty industry in rural areas, effectively extending the agricultural industry chain, improving agricultural efficiency, increasing farmers' incomes, improving the rural environment, and promoting the sustainable development of the rural economy and society.

4. The development and utilization of renewable energy is an important choice for opening up new areas of economic growth, promoting economic transformation and expanding employment. Renewable energy resources are widely distributed, and all regions have certain conditions for the development and utilization of renewable energy. The development and utilization of renewable energy resources mainly utilizes local natural resources and human resources, and is of great significance to the promotion of regional economic development. At the same time, renewable energy is also a new high-tech and emerging industry, the rapid development of renewable energy has become a new economic growth point, can effectively stimulate the development of equipment manufacturing and other related industries, on the adjustment of industrial structure, to promote the transformation of the mode of economic growth, expanding employment, and promote the sustainable development of the economy and society is of great significance.

Currently, international oil prices have soared again and again, and energy consuming countries are suffering, so the development of renewable energy has become a matter of concern for many countries.

Until now, renewable energy in the world's research boom in the ascendant, one of the reasons, is the energy crisis is approaching, according to the coal mining rate in 2003, China's coal can be mined for more than 80 years, and China, is the world's largest coal reserves in the country. The oil in the Gulf, in less than forty years, will also be depleted. We envision what we humans will do if that day comes.

So, no matter what country, they are all aiming to work in this direction, hoping to get a technological breakthrough, so as to get rid of the passive situation before the real crisis comes. Obtain the dominant power in the world. It's a question of a country's strategy. There is a western political patriarch said well, "the twenty-first century energy technology, will greatly change the world's political pattern and geopolitics."

Renewable energy is much more than that, it will change people's mindset. Renewable energy is a generous gift given to us by nature, which can greatly get rid of the limitation of resources, thus reducing the fight for resources and bringing peace to the world. The sky phoenix sea rain, inexhaustible, inexhaustible. And it can henceforth get rid of the environmental nuisance brought about by mankind's industrial development. Its significance, no matter how one describes it, is not excessive. It will bring a new revolution not only in the way of life but also in the concept of human beings.

The current breakthrough in renewable energy is wind power. China started early, but is now lagging behind. You can see my "China's wind power behind the reasons". At present, China's wind turbine capacity is not large, while foreign countries are developing has reached 7500 kilowatts, put into operation in Germany's wind turbine has reached a single capacity of 5000 kilowatts. Behind more than one generation. In the past two years, China's swarm of wind turbines, the host are imported from abroad, the current cost of power generation is still higher than thermal power, to rely on the country's financial subsidies in order to get by, and even then, to fully recover the cost, but also need to take ten years. That is to say, in ten years, we are to the foreign devils to carry the work. The first time I saw this is when I was in the middle of the night, and I was in the middle of the night.

In addition to wind power, biomass power generation is also in the ascendant, mainly direct combustion of biomass, such as straw power generation, at present, Guodian Group has a lot of small cogeneration units put into operation, the benefits are good. Its power generation method is similar to conventional thermal power, using a chain furnace. There is not much technological innovation. The other is mainly biogas power generation, the use of bacterial fermentation to produce methane gas, combustion to drive the gas turbine, power generation efficiency is high. But the cost is not expensive, just a fermentation vessel requires a large investment. And the fermentation efficiency is not so high, it is better to use semi-fermented raw materials, such as using cow dung. There are some domestic farms have built a small power plant, but the technology is also mainly the introduction of the use of strain patents, is not a small amount of money. Too energy can generate electricity, in our country in recent years there is also a relatively rapid development of monocrystalline silicon, polycrystalline silicon power generation efficiency is expected to be in a relatively short period of time, the power generation efficiency increased to more than twenty percent. But for now, despite the relatively rapid decline in solar panel prices, it is surprising that the cost of power generation is more than five times the cost of thermal power, into commercial operation there is a long way to go.

The above mentioned several power generation methods, its biggest drawback is that in the power system can not do the main unit, can not meet the large number of power use, and poor stability. For example, wind power, although China's wind resources are very rich, but because of the instability of wind power generation, its power after the trend of calculation, only about ten percent of the total power generation, if the unit is too much, it will affect the stable operation of the entire power grid, because the wind is not controllable. The other form of generating units, the power generation is relatively small, it is difficult to meet the demand.

In addition, there is tidal power, the world's largest tidal power plant installed capacity of more than 200,000 kilowatts, has been very substantial. With China's coastal conditions, the energy density is not great. The highest tides are along the coasts of Zhejiang and Guangdong. The highest tides reach about 8.5 meters in the highest areas. There is also the necessity to build sea-blocking dams, the construction of which is quite complicated and difficult. The maintenance of the dams and the protection of the machinery against corrosion by sea water require a considerable amount of money. Not to mention the cost, the choice of the dam site is difficult. At present, China's Bureau of Oceanography has made a report on the study of seawater energy, and it is believed that there are about 10 million kilowatts of tidal power stations that can be developed in our country at present. Then so little power, is far from being able to meet the demand.

China's energy policy, previously written in textbooks is: "vigorously develop hydropower, appropriate development of nuclear power, control the development of thermal power." Mainly shut down small thermal power units. The exception is thermal power. The actual state of our power grid is that thermal power generation accounts for eighty percent and hydropower accounts for twenty percent. The rest is nuclear power, which doesn't make up a fraction of a percent. Other forms of generation are basically negligible. Although I do not understand the recent policy, but the development of nuclear power is certainly on the agenda. Because our country's small hydropower development is not bad, can be utilized to develop hydropower resources will not be much. Thermal power increasingly to large units, large capacity development. At present, the largest thermal power unit has been put into operation is 1 million kilowatts.

The problem of nuclear power, although we do not know much about it, I personally do not know very y, but I think no one wants to live next to an atomic bomb. It is a move of last resort. The leakage of the Chernobyl power plant in the former Soviet Union still haunts the world.

Since so many ways of generating electricity are problematic, is there no way out of the energy problem? The answer is no, there is a way out. The shortage of energy is actually relative. On the one hand, fuel prices continue to rise, on the one hand, with the progress of science, the price of renewable energy in the non-stop decline. When the two are equalized, investment will inevitably tilt towards the latter. A new era is dawning. But fully meet the needs of electricity, in addition to nuclear power, other than only as a supplement. And cannot serve as the main unit. This is the main problem we face. In other words, not to develop nuclear power, we are not another way out, this is a problem.

At present, the dawn of the sea is the wave power generation and ocean current power generation. This is a better way to generate electricity. Not only national research organizations, but also private research institutions and individuals have been constantly exploring. This exploration can even be traced back to thirty years ago, when a farmer in Fujian used a wave-powered boat to generate 7 kilowatts of electricity. Its large-scale experimentation is still more recent. The United Kingdom has invested a lot of money in research in this area, this country is small, poor resources, but surrounded by the sea, ocean energy is very rich. In addition, the research of wave energy in front of the Japanese ghosts.

Thousands of mechanical designs for wave energy utilization around the world have been patented, and hundreds of patents have been issued. Wave energy utilization has been called the "inventor's paradise".

The earliest patent for a mechanical invention utilizing wave energy was granted to the Frenchman Girard and his son in 1799. 340 patents for wave energy inventions were registered in the United Kingdom during the 119 years from 1854 to 1973, and 61 in the United States. In France, 600 specifications for wave energy utilization technologies are available.

In the 1960s, Japan successfully developed a pneumatic wave power generation device for use on beacon light floats. This device has been put into mass production, product rated power from 60 watts to 500 watts. Products in addition to Japan's own use, but also exports, becoming one of the only few commercialized wave energy equipment.

The principle of power generation is like an inverted pump, which relies on the up-and-down motion of waves to suck and press air, and push the turbine to generate power.

Japan's "Haemin" wave power test ship to achieve 190,000 degrees of annual power generation, good results, the realization of the floating wave power station to land small-scale power delivery. Japan has been the "Sea Bright" wave power generation ship as "off-island power" of choice, continue to study and improve.

But the degree of attention of our government is obviously not enough, in the thirty years of time, the investment in research funds only 10 million more than enough money for a few cadres to buy a few cars. And Britain has invested billions of pounds in five years.

The benefits of wave energy generation are obvious, that is, the regularity is strong, the energy cycle is short, if there is a large-scale storage device, (such as reservoirs) is able to generate large-scale power and as the main unit. If a breakthrough is achieved, it is entirely possible to replace thermal power.

If you want to make wave power generation to replace thermal power, the storage link is essential, the cheapest way to store energy is the reservoir, so I personally think that the shore storage reservoir plus conventional turbine generator model should be the direction of research. That is to say, the use of seawater wave energy to lift water to the shore to establish the water storage reservoir. For no other reason, the main water storage reservoir storage of energy is the most economical, and not like a conventional dam reservoirs need to establish a large dam. Because the river water with the seasons change a lot, there are abundant water and dry water period. The water surface of the sea, on the other hand, is almost unchanging. Another reason is that it is extremely easy to build a reservoir on the shore, without engineering difficulties, and the maintenance costs are much more economical than a barrage. The impact of seawater corrosion is also relatively small.