1. Because the waste gases it emits will cause great environmental pollution and form a "greenhouse effect". In addition, thermal power generation will also consume a large amount of water resources.
2. Reused water consumption refers to the total quantity of water that has not been treated and is reused after treatment in a given water use unit or system, including circulating water, series water, recycled water and reused water. water. The amount does not include circulation within the district heating network in the northern areas, therefore the quantity of water reused does not include thermal energy production.
The cooling tower of the power plant is very strange. Why is the top opening small and the bottom opening large?
There are two types of waste (hot) water in power plants: one is circulating waterindustrial (which should not be used for bathing); the other is wastewater discharged from boilers (which contains various pollutants). . It is not suitable for swimming). If it is condensed water, it will be reused in the boiler (usually recovered in the turbine condenser). Such good water will not be wasted.
It is perfectly possible to use the residual heat steam to heat the bath water. Today's thermal power plants use this model to achieve social benefits.
Can water from thermal power plants be used for bathing?
Electric energy in everyday life comes from nature, but producing this energy requires the power of nature. There are many ways to generate electricity and power plants in life, such as thermal power generation, hydropower generation, hydroelectric power generation, etc.wind energy, etc. However, one of our common methods is thermal power generation. What is the role of thermal cooling tower. energy production. Thermal power plants use a large amount of cooling water. This cooling water mainly passes through the condenser of the steam turbine to cool the spent steam which has worked into condensed water for recycling. This is practical and should not be wasted.
This type of cooling water is called “circulating water” and comes from rivers, lakes or deep wells. Circulating water in power plants is divided into “open circulation” and “closed circulation”. Closed circulation is often used in areas where water is scarce. Open cycle means it is only used once and discharged after heat exchange in the cooler. The closed cycle consists of passing thewaste cooling water through the cooling tower and then use it repeatedly. The upper mouth is small and the lower mouth is large. This is called a hyperboloid shape. The tower body is a thin-walled hyperbolic space structure without ribs or columns conducive to natural ventilation. It is mainly made of reinforced concrete to make it more stable. The height of the tower is usually 75 to 110 meters and its diameter. from the bottom of the tower is 65 to 100 meters.
The upper part of the tower is the air duct, and the water distribution tank and water spraying device are below the elevation of 10 meters. The water spray device is the main equipment for evaporating water and dissipating heat. During operation, water flows out of the water distribution tank and splashes, and air enters from the bottom side of the tower, after un complete contact with water, it is evacuated upwards with heat. The cooling process is mainly evaporative heat dissipation. and a small part is convective heat dissipation.
The hyperbolic cooling tower occupies a smaller area than the swimming pool type cooling structure, has a compact layout, low water loss, and the cooling effect is not affected by the wind. However, it is tall and complex. construction and expensive. It is a chain of relationships: 1. The installed capacity of the power plant increases. 2. A larger cooling tower needs to be built. 3. Cooling capacity is directly affected by area and height. Therefore, cooling towers need to be taller and larger. 4 Tall cylindrical structures are very unstable, and even if they are built, the cost is very high.5 Large cooling towers must be constructed economically. 6 Hyperboloid towers are the most economical.
Water used (produced) by power plants is roughly divided into the following categories:
1. “Raw water” extracted from rivers and lakes has not been treated and is not suitable for proper use. (Mainly used for circulation cooling)
2. The raw water is precipitated and filtered to become "domestic fire water", which is equivalent to "tap water" and can be used for bathing.
3. Domestic firefighting water is then treated with chemicals to become “industrial water” and should not be used. (Used for equipment cooling)
4. It will then be transformed into “demineralized water” and cannot be used. (for boiler fluid)