The cooling tower is used for cooling. When cold water passes through the condenser for heat exchange, the water temperature increases. The high temperature water is cooled by the cooling tower and then passes through the condenser. heat exchange and so on.
There are several types of cooling water systems in power plants, some are circulating (as above), and some do not require a cooling tower and are returned directly to the river (for power plants near rivers)< /p>
At a glance Can be reused
What is the function of the cooling water circulation system in a condensing thermal power plant?
The function of the cooling system The tower in a thermal power plant is to provide a certain temperature for the condenser. Cooling water is used to condense the steamexhaust of the low pressure cylinder of the steam turbine, so that the steam turbine can operate safely and economically under a certain exhaust temperature. the steam pressure. The functions of cooling towers in thermal power plants are as follows:
The higher the cooling capacity of the cooling tower, the lower the temperature of the cooling water supplied to the condenser after circulating water passes through the cooling system. tower, and the lower the cooling water temperature, it will also improve the condenser vacuum, which ultimately reduces the coal consumption level of the power plant and improves the economical operation of the unit.
The choice of cooling tower is very important. There are many shapes of cooling towers and their structures are also very complex. According to the method ofventilation, there are natural ventilation cooling towers and mechanical ventilation cooling towers according to the contact method between hot water and air, there are wet cooling towers (open type), cooling towers dry (closed type) and dry and wet; Types (mixed). Classified according to the flow direction of hot water and air, there are counter-flow cooling towers and cross-flow cooling towers.
Thermal power plants generally use moist natural ventilation cooling towers or moist mechanical ventilation cooling towers. Moist natural ventilation cooling tower is a cooling tower that uses wind or natural heat to generate airflow. Its advantages are simple structure, low operating cost and easy maintenance. Its disadvantages are large size, low eefficiency and a significant impact on the environment. Wet mechanical ventilation cooling tower is a cooling tower that uses fans to force airflow. Its advantages are small size, high efficiency and it is not affected by the environment. Its disadvantages are complex structure, high operating costs and high noise.
The condenser type steam turbine generator set is equipped with a condenser. The main function of the circulating water is to cool the steam generated by the turbine through the condenser and cool the steam in. condensed water for recycling. Circulating water also plays a role in cooling the lubricating oil. In addition, domestic fire extinguishing water, industrial water and desalinated water from the power plant are all treated from the circulating water system.