The purpose of setting up exhaust in the power distribution room:
1. During the use of the power distribution room, the high and low voltage distribution cabinets, contact busbars, and transformers will generate heat, and the power distribution room will be stuffy and the air quality will be affected. becomes very poor, so only mechanical ventilation inside and outside is required, but it does not have to be forced to the roof.
The generator room and the power distribution room are completely different:
1. During the use of the generator, the diesel generator will generate a lot of heat;
2 In the process of burning diesel and converting it into energy form, a diesel generator will consume a large amount of oxygen, produce carbon dioxide, and make the air worse.
So the exhaust function of the generator room and the distribution room are different, and they need to be discharged directly to the roof.
In summary, one shaft cannot be shared.
How to regulate the ventilation in the diesel generator room
You can do an experiment. Take 2 paper pinwheels and place them one behind the other in front of the fan to see if the one at the back will work. change.
After the wind rotates a generator to generate electricity, the wind energy is converted into kinetic energy, and the wind energy is reduced. If there is a generator immediately behind it, the wind energy received will be reduced.
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Supplementary information:
1. As the poster said, if it is installed in a pipe, the windmill at the back will naturally rotate, because When the wind blows in from one end, it will inevitably blow out from the other end, because the pipe changes the direction of the wind, forcing the wind direction disrupted by the windmill to return to its original direction. But wind turbines are built in the wilderness, and the wind flows freely without a pipe to restrain it. The wind blows from one direction, and after passing the wind turbine, its direction is disrupted and its speed is reduced.
2. I don’t quite understand this question.
The wind turbine rotates slowly because the wind speed at that time is slow. The faster the wind speed, the faster the rotation speed. The wind does not just blow between the blades, because the direction of the blades is not parallel to the direction of the wind, but at a certain angle. The wind blows on the blades, causing them to rotate. During this process, the wind does work on the blades, and the kinetic energy of the wind is converted into the kinetic energy of the generator.
Let’s take an extreme example: when the wind blows on a wall, the wall does not fall, the wind speed drops to zero, and the wall receives an external force. If the wall collapses, the wind speed will not be zero, but the speed will slow down because work is done on the wall - the same principle as a generator.
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Additional 2:
1. As the poster said, the air entering the duct is continuous. Theoretically, the wind enters A uniform duct (same duct cross-section) and the instantaneous velocity leaving the duct should be the same because there is no loss of air volume. This should use all fansrotating.
The condition we assume here is a cylindrical pipe with the same cross-section. Because the wind direction remains unchanged, we came to the above conclusion. The original poster had previously assumed a small box with two opposite holes. If it is a square box (the kind with edges), it is difficult to say whether to open two holes on each opposite side. Because gas vortices will occur in the corners of the square box, we must also consider various changes in the gas inside the box. . . Very complicated. If you are interested, I suggest you read some books on fluid mechanics.
2. When the fan blades are stationary, the gap between them is indeed large; but once the fan blades rotate, the gap between them will become smaller. The faster the speed, the smaller the gap. For example, when an electric fan is working, can you see the gaps between its blades? ----cannot. But when you turn off the switch, the fan blades rotate slower and slower, and the gaps become more and more obvious.
So, when the blades of the wind turbine are stationary or rotate slowly, there will be breeze or air passing between the blades; when the wind speed increases and the blades rotate faster and faster, there will be no gaps. doubts.
What are the requirements for choosing the installation of wind turbines?
Diesel generator room ventilation includes two parts, daily ventilation and working ventilation.
Daily ventilation: The number of daily ventilation in the machine room of air-cooled and water-cooled generators is 6 times, and the number of ventilation in the oil storage room is not less than 3 times. For computer rooms that use gas fire extinguishing systems, after a fire, this ventilation system is responsible for removing indoor exhaust gas, but it is not accident ventilation. To ensure people's safety, it is recommended to set the start button for accident ventilation.
Working ventilation: Water-cooled diesel generators must consider the amount of air required for working oxygen consumption; air-cooled generators have a large cooling air volume and generally use natural air intake. Diesel engines have their own fan pressure emissions, but diesel generators The pressure head of the built-in fan is only about 150Pa. When the resistance of the shaft is large, a fan needs to be added to overcome the resistance of the shaft. Generally, if the resistance of the air inlet shaft is large, an air inlet fan is added; if the resistance of the exhaust shaft is large, an exhaust fan is added.
The diesel generator room uses gas fire extinguishing. Solenoid valves should be installed on the air inlet and exhaust channels. When a fire occurs in the diesel generator room and gas fire extinguishing is started, these valves will be closed in a chain to ensure the fire extinguishing effect.
The exhaust of diesel generators is pressurized exhaust with high flue gas temperature and high air flow velocity. The flue gas needs to be discharged at high altitude. The smoke pipe should be thermally insulated and a shock-absorbing hanger should be installed.
Diesel generator rooms must pay attention to ventilation and smoke exhaust, otherwise it will affect the use of the generator and cause damage to the generator. For companies that cannot afford power outages, damage to the generator is a very bad thing. matter.
That is, the selection of the location of the wind turbine should be based on a technical and economic comparison of several options to determine the layout plan of the wind turbines in the wind farm so that the wind farm can obtain better power generation. In addition to the distribution characteristics of wind energy resources in wind farms, unit layout also needs to consider the limitations of objective factors such as land use, villages, power facilities, environmentally sensitive factors, the terrain conditions around the wind turbines, buildings, trees orAdverse effects of other obstacles and wake effects between wind turbines.
In flat terrain conditions, it is easy to meet this principle. In mountainous areas, meeting this principle is often difficult. According to the requirements of the transportation machinery and installation machinery required for the selected model, there should be enough space near the machine position to operate and place the blades and towers. The road should have sufficient slope, width and turning radius to enable the transportation machinery to reach the selected location. aircraft position. Arrange in columns parallel to the main wind energy direction and in rows perpendicular to the main wind energy direction. Rows are parallel and columns are spaced the same. The power generation is higher when the row spacing is larger than the column spacing, but the equidistant arrangement is visually better. Pursuing visual beauty will result in a certain loss of power generation, so there must be a certain balance between economic benefits and beauty.
It is worth noting that the energy loss of a multi-row and multi-column arrangement is also related to the terrain and ground roughness, so the above numbers only give us a perceptual understanding. On the one hand, considering the wake effect of wind turbines, we should make the distance between wind turbines as large as possible; on the other hand, restrictions on land use and grid connection require that the distance between wind turbines be as small as possible. According to experience, in the direction parallel to the main wind direction, the distance between wind turbines is generally maintained at a distance of 5 to 9 times the impeller diameter; in the direction perpendicular to the main wind direction, the distance between wind turbines is generally maintained at a distance of 3 to 5 times the impeller diameter. . The arrangement shown in Figure 3 takes into account many factors, and the units are arranged in a plum blossom shape.
The main wind energy direction in this area is the west and its southerly and northerly directions. Since the surface roughness of the water surface is small, the westerly wind still has high energy after passing through the water surface. In the land area on the east side of the water area, after the airflow lands, due to the increase in ground roughness, the attenuation of wind speed increases and the wind power density decreases. The south, west and north sides of the water area are all hilly areas. In particular, the highlands (ridges) in the hilly area on the west side of the water area are perpendicular to the main wind direction. When the airflow flows through this area, it creates strong turbulence as the ground rises. Climbing acceleration effect, the wind speed reaches the maximum value in the mountain top area, so the mountain top area is an ideal cloth machine area.