Green energy in a narrow sense refers to renewable energy, such as hydropower, biomass energy, solar energy, wind energy, geothermal energy, ocean energy and so on. These energy sources can be replenished after consumption, with little pollution. Green energy in a broad sense includes choosing energy sources that have little or no pollution to the ecological environment in the process of energy production and consumption, such as natural gas, clean coal (coal is converted into gas or "coal" oil through chemical reaction and into electricity through high-tech strictly controlled combustion), nuclear energy and so on.

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Green energy

People often mention green energy, such as solar energy, hydrogen energy and wind energy. And it is another kind of green.

Color energy is the fuel provided by green plants, so we call it green energy.

Also known as biological energy or material energy.

In fact, green energy is an ancient energy. For thousands of years, our ancestors have cut down trees.

Plant trees, chop wood and cook, keep warm, live and multiply. The consequence of this survival is to give the natural ecological balance zone.

There has been serious damage. Painful historical lessons tell us that using bioenergy to sustain mankind.

In order to survive and even benefit mankind, we must act according to the laws of nature, not only using it,

We should also protect it, develop it, and maintain a virtuous circle of the natural ecosystem.

But in green energy, another resource is grass. According to statistics, the current world

There are 2.6 billion hectares of grassland in the world, most of which are natural grasslands. It can be grazing or wild.

A paradise for animals to survive and reproduce. There are also some grasslands that provide livestock with feed for the winter, rarely.

Part of the grassland is to provide fuel for people's lives.

In recent years, due to the improvement of farmers' living standards, the degree of electrification is also constantly improving.

High, the fuel structure of most farmers has undergone fundamental changes, and many farmers have friends in winter.

In the season, firewood is no longer burned on the kang, the electric blanket is as warm as spring, and firewood is no longer burned for cooking.

Burning straw, using honeycomb coal stove, liquefied gas stove and biogas. Even if the straw is burned,

It is a small part of remote mountainous areas or individual farmers. There are still a lot of straw piled in the ground, piles and piles.

In mountainous areas, some even encroached on farmland. Therefore, some farmers burn a lot of straw in the fields, which makes

Environmental pollution even affects road traffic and aircraft take-off and landing.

How can we solve this problem? The most effective is comprehensive utilization. Practice has proved that agriculture

Crop straw can be used as fertilizer, feed and firewood. If we put agriculture

The biogas produced by retting straw can be used as fuel or illuminated by biogas lamp, which has rotted.

Straw can also be used as fertilizer. If the straw is crushed and mixed with grass, it can also be used to feed livestock, livestock

Our excrement can also be used to make biogas, and the residue left after making biogas can also be used as fertilizer.

Therefore, vigorously developing the comprehensive utilization of biogas is a good way to solve the current rural energy shortage.

ocean energy

The ocean not only provides shipping, water and rich mineral deposits for human beings, but also contains huge energy. It stores solar energy and derived wind energy in the form of thermal energy and mechanical energy in seawater, which is not as easy to be lost as in land and air.

Ocean energy refers to renewable energy attached to seawater. The ocean receives, stores and releases energy through various physical processes. These energies exist in the ocean in the form of tides, waves, temperature differences, salinity gradients and ocean currents, which are described as follows:

Tide and tidal current energy comes from the gravity of the moon and the sun, and other ocean energy comes from solar radiation. The ocean area accounts for 765,438+0% of the total area of the earth. Most of the energy that the sun reaches the earth falls on the ocean and seawater, and some of it is converted into various forms of ocean energy.

The temperature difference energy of seawater is heat energy. At low latitudes, the sea surface temperature is high, and there is a temperature difference with the deep cold water, but it stores the thermal energy of temperature difference, and its energy is proportional to the temperature difference and water quantity.

Tides, tidal currents, ocean currents and wave energy are all mechanical energy. Tidal energy is the energy generated by the earth's rotation, which is transmitted to the ocean through the gravitational action of the sun and the moon and stored in the form of long-period waves. Tidal energy is proportional to tidal range and tidal volume. The energy of tidal current and ocean current is proportional to the sum of squares of velocity and flux; Wave energy is mechanical energy generated by wind, which is stored by short-period waves in the form of potential energy and kinetic energy. Wave energy is proportional to the square of wave height and the fluctuating water area.

The salinity difference energy of seawater in estuary is chemical energy, and there is salinity difference between fresh water and seawater flowing into the sea. If separated by a semi-permeable membrane, fresh water permeates to the seawater side to produce osmotic pressure, and its energy is proportional to the pressure difference and osmotic flow. Therefore, there are great differences in the physical process development technology and the degree of development and utilization involved in various energy sources.