China attaches great importance to environmental protection. Why?

1, environmental protection is conducive to building a conservation-oriented society and achieving sustainable development;

2, environmental protection is conducive to enhancing the awareness of saving resources and protecting the environment;

3. Environmental protection is conducive to enhancing investment attraction and economic competitiveness, and realizing transformation and leapfrogging;

Environmental protection is conducive to the great rejuvenation of the Chinese nation, and it is a policy that benefits the people and the country and concerns future generations.

The ways of environmental protection include: adopting administrative, legal, economic, scientific and technological, non-governmental spontaneous environmental protection organizations, etc. Make rational use of natural resources, prevent environmental pollution and destruction, realize the balance and sustainable development of natural environment, human environment and economic environment, expand the reproduction of useful resources and ensure social development.

Extended data

Specific measures

1, air conditioning in winter 18 in summer 26, saving hundreds of millions of kwh nationwide.

In winter, the air conditioning temperature is adjusted to below 18 degrees. If you feel a little cold, you can put on more clothes. Such a simple measure can save electricity, thus reducing greenhouse gases such as carbon dioxide emitted by coal-fired power generation and slowing down climate warming.

In summer, the air conditioning temperature is adjusted to above 26 degrees. The air conditioning load in big cities accounts for about 40%-50% of the maximum power supply load in midsummer. Increasing the air conditioning temperature from 22-24℃ to 26-28℃ can reduce the power load 10%- 15% and reduce the electricity consumption by more than 400-600 million kWh.

Sweating in summer is beneficial to people, which can enhance metabolism, regulate endocrine function and promote autoimmunity.

2. Use energy-saving lamps instead of light bulbs, saving electricity by nearly 80%.

Ordinary light bulbs at home have been replaced by energy-saving light bulbs. If you want to buy products that have passed the national energy-saving product certification, you can judge by whether the word "festival" is printed. Under the same luminous flux, energy-saving lamps save 80% electricity compared with incandescent lamps, and the cost of purchasing energy-saving lamps can be recovered from (8 ~ 10) months of energy saving.

Don't throw away the garbage, recycle it and regenerate it.

In garbage, about 50% is biological organic matter, and about 30%-40% has the value of recycling. In 2000, six kinds of recyclable wastes were produced in China, namely, waste steel 4 1.5-0.43 million tons, waste nonferrous metal 0/0.2 million tons, waste rubber 850,000-920,000 tons, waste plastic 2.3-2.5 million tons and waste glass 0/0.40 million tons.

Up to now, the value of waste that can be used but not used in China reaches 25 billion yuan every year, and about 3 million tons of scrap steel and 6 million tons of waste paper are not recycled. The recovery rate of waste plastics is less than 3%, and the recovery rate of waste rubber is 3 1%. Only more than 6 billion waste dry batteries contain more than 70,000 tons of zinc and 654.38+10,000 tons of manganese dioxide every year.

4, no need to cut off the power supply with electrical appliances, saving electricity 10%.

Please turn off all kinds of electrical appliances in your home and office, such as TV and computer, when not in use. In standby mode, the average power consumption per hour of TV set, air conditioner, monitor, PC host and range hood is 8.07 Joules, 3.47 Joules, 7.69 Joules, 35.07 Joules and 6.06 Joules respectively. Turning off the power can not only save your electricity bill, but also protect the environment.

5. Encourage energy-intensive enterprises to install energy-saving facilities.

Due to energy shortage, with the further development of energy saving work. Various new advanced energy-saving kilns are becoming more and more perfect, and the heat loss of kilns is obviously reduced after adopting high-quality insulation materials such as new refractory fibers. Adopt advanced combustion device to strengthen combustion, reduce incomplete combustion and make air-fuel ratio more reasonable.

However, the technology of reducing flue gas heat loss and recovering flue gas waste heat is still not progressing fast. In order to further improve the thermal efficiency of the kiln and achieve the purpose of saving energy and reducing consumption, recovering flue gas waste heat is also an important energy-saving way.

There are usually two ways to recover flue gas waste heat: one is to preheat the workpiece; The other is to preheat the air for combustion. Flue gas preheating workpiece needs to take up a large volume for heat exchange, which is often limited by the workplace (this method can not be used in batch furnaces).

Preheating air is a good way to support combustion. Generally arranged on the heating furnace, it can also strengthen combustion, speed up the heating rate of the furnace and improve the thermal performance of the furnace. This not only meets the process requirements, but also can achieve significant comprehensive energy-saving effect.

6. Other measures

In addition, since 1950s, preheaters for preheating air have been used in industrial furnaces in China. The main forms are tubular, cylindrical radial and cast iron block heat exchangers, but the heat exchange efficiency is low. In 1980s, domestic heat exchangers, such as jet type, jet radiation type and composite table type, were developed one after another, which mainly solved the problem of medium and low temperature waste heat recovery.

The recovery of flue gas waste heat below 100 degrees has achieved remarkable results, and the heat exchange efficiency has been improved. However, at high temperature, it is still limited by the material of heat exchanger, with short service life, heavy maintenance workload or high solid cost, which affects its popularization and use.

265438+At the beginning of the 20th century, gongyi city finally developed Ronghua ceramic heat exchanger. Its production process is basically the same as that of kiln furniture, and thermal conductivity and oxidation resistance are the main application properties of the material.

Its principle is to place the ceramic heat exchanger near the outlet of the flue with high temperature, without adding cold air and high temperature protection. When the kiln temperature is 1250- 1450℃, the flue outlet temperature should be 1000- 1300℃, and the waste heat recovered by ceramic heat exchanger can reach 450-750℃.

Sending the recovered hot air into the kiln to form mixed gas combustion can save energy by 35%-55%, directly reduce production cost and increase economic benefits.

Ceramic heat exchanger has been well developed under the limitation of metal heat exchanger, because it solves the problems of corrosion resistance and high temperature resistance and becomes the best heat exchanger for recovering high temperature waste heat.

After years of production practice, it shows that the effect of ceramic heat exchanger is good. Its main advantages are good thermal conductivity, high high temperature strength, good oxidation resistance and thermal shock resistance. Long service life, small maintenance, reliable and stable performance and simple operation. It is the best device to recover the waste heat of high temperature flue gas so far.

Up to now, ceramic heat exchangers have been used in major hot kilns in metallurgy, nonferrous metals, refractories, chemicals, building materials and other industries, and are making great contributions to the cause of energy conservation and emission reduction in the world.

Baidu encyclopedia-environmental protection