The environmental problem of the wind farm is the source of noise affecting the wind turbine: one is the aerodynamic noise generated when the wind turbine blade rotates, which is emitted from the vortex at the trailing edge of the blade and the tip of the blade. other
author：Electricians operate and maintain the Golden Pavilion
Environmental issues for wind farms
First, the impact of noise
Sources of wind turbine noise:
One is the aerodynamic noise generated when the wind wheel blade rotates, emitted from the vortex at the trailing edge and tip of the blade. The other is mechanical noise from components such as gearboxes and generators, which can be reduced to an acceptable level through careful design, such as improved blade shape and enhanced cabin sound insulation. The noise level at 200 m from the unit is 45 dB(A) when the modern 300 kW unit is operating at a wind speed of 8 m/S, which Denmark stipulates is the minimum distance between a single wind turbine and the residential house, while the wind farm should be 500 m. Another limiting indicator is that the noise level of the wind turbine when running should not exceed the existing nighttime background noise level of 5dB (A) in the local area.
Second, the interference of electromagnetic waves
Scatter forward, causing the TV signal to attenuate to varying degrees with the speed of the wind wheel. Ask the scattering, the TV screen will appear ghosted or distorted.
3. Impact on ecology and landscape
Ecological impacts: mainly land use, changes in vegetation during construction, and birds
Changes in habits, etc.
Landscape Impact: While most people think that wind turbines are beautiful, like windmills in the Netherlands, wind farms are mostly tourist attractions, but some insist that wind power is an obstacle to viewing, and it is best to stay away from settlements and scenic areas.
The true cost of producing traditional energy sources includes those that have to be absorbed by society, including health impacts and local and regional environmental degradation, from global effects such as mercury pollution and acid rain to climate change.
The environmental benefits of wind power depend on the pollution of thermal power it avoids, and the degree of pollution is related to the quality of coal in thermal power plants, boiler combustion and power generation technology, which varies from region to region. Taking the consumption of 380g of standard coal per kW·h as an example, the environmental benefits of the wind farm with an installed capacity of 100,000 kW and an annual power generation capacity of 230 million kW·h can be saved by 87,400 tons of standard coal per year, which is about 180,000 tons of raw coal, which can reduce soot emissions by 1150 tons, ash residue by 27,600 tons, sulfur dioxide by 1403 tons, nitrogen oxides by 1035 tons, and carbon dioxide by 265,000 tons.
If the avoidable pollution cost per kW·h wind power is 0.18 yuan, the environmental benefits of the above 100,000 kW wind farms are estimated to be about 40 million yuan per year.
From the entire life cycle analysis, the impression of wind farms as a high-quality energy source can also be obtained. Taking a 100,000-kilowatt wind farm as an example, studies have shown that:
Wind farms operate for an average of 14 days, and their on-line electricity is sufficient to compensate for the direct energy consumption that occurs during the manufacture, assembly and installation of wind turbine equipment;
Wind farms operate for an average of 108 days, and their on-line electricity is sufficient to compensate for the combined energy consumption incurred in order to obtain the raw materials used in the process of these equipment; Wind farms operate for an average of 4 to 5 days, and their online electricity is enough to compensate for the energy consumed to transport these devices. The sum of the three parts of energy, the average operating day of the wind farm is 126.5 days can be fully compensated.
That is to say, the energy consumed by building a 100,000-kilowatt wind farm can be fully compensated for by the average operation of a wind farm for a little more than 4 months. If the wind farm life is calculated as 20 years, it is possible to generate 58 times the energy consumed to build a wind farm, which is a considerable energy efficiency value. It can be seen that the benefits of wind power generation for resource conservation and environmental protection are very significant.