Recently, the 300,000, 600,000 and 1 million units of power plants have two units separated by a chimney. The four-unit scale is designed once and constructed in two phases, which is relatively easy to manage. We therefore see many with two chimneys. Of course, new factories usually only have one chimney, while older factories have four or five.
The hyperbolic cooling tower is a cooling tower instead of a chimney. It is used to cool the steam from the turbine and condense it into water for recycling. The reason it has a hyperbolic shape is because the cooling tower is large and has a very heavy weight. If it goes straight up and down, the building materials at the bottom will bear enormous pressure and will not be able to withstand it (we know this). the highest mountain in the world can only reach 30,000 meters, otherwise the rock inbottom will melt). Now the edge of the cooling tower takes on a hyperbolic shape, making the pressure equal in each section. In this way, the cooling tower can be made very large.