Questions about saturated steam and superheated steam? Urgent! Urgent! Urgent! Urgent! !

1. The saturated state refers to a condition in which, during evaporation in a container, the molecules of water and steam continue to move constantly. That is, some water evaporates and turns into water vapor at the surface, while at the same time some water vapor condenses back into liquid and returns to the surface. The number of molecules that leave the surface equals the number of molecules that return to the liquid. This temporary relative equilibrium achieved by the moving molecules of water and water vapor is called dynamic equilibrium. The state in which vapor and liquid coexist in dynamic equilibrium is known as the saturated state. 2. Water that is in a saturated state is called saturated water, and its vapor is called saturated vapor. At saturation, the temperature of water and steam is the same; this temperature is known as the saturation temperature ； The pressure of water and steam is also the same, and it is called saturated pressure. 3. Wet saturated steam is saturated steam that contains moisture; it is called wet saturated steam, and its dryness degree is less than 1. Then, what corresponds to wet saturated steam is dry saturated steam. Dry saturated steam is steam in which all of the saturated water has turned into vapor; such steam, which contains no moisture, is called dry saturated steam, and its dryness degree is equal to 1. 4. Superheated steam is steam at a certain pressure whose temperature is higher than the saturation temperature at that pressure; such steam is considered superheated steam. If saturated steam is further heated at constant pressure, its temperature begins to rise, resulting in superheated steam.

What are the differences in their applications between superheated steam and saturated steam? Why is it sometimes superheated and sometimes saturated? Why

It depends on the purpose of your steam. If it is used for indirect heating, latent heat is released when saturated steam condenses into water, and this is when the steam’s energy efficiency is at its highest； If your steam is used for direct heating, in order to ensure the product remains dry, it is necessary to prevent the steam from condensing by using supersaturated steam, such as in air-flow drying equipment.

1. One should first understand the definitions of saturated steam and superheated steam. 2. At each pressure, water vapor has a corresponding temperature; for example, steam at 3.5 KG/CM2 has a temperature of 136.7°C. This temperature is known as the saturation temperature. If the temperature is 150°C, then it is called superheated steam. 3. What then is unsaturated steam? If steam at 3.5 KG/CM2 has a temperature of 136.7°C, it contains a certain amount of water. But when the temperature rises to 150°C, the amount of water present decreases. In such cases, the steam is considered unsaturated steam. Therefore, it can be said that superheated steam = unsaturated steam. 4. When unsaturated steam is mixed with water, the temperature drops, but the pressure does not change. 5. Finally, one more point: why is it necessary to have overheated and saturated steam? When steam is transported over long distances, no matter how well insulation is in place, heat loss is inevitable. Once enough heat is lost, water will condense. Therefore, it is necessary to install drain pipes, which increases the risk of piping issues and leaks. That’s why, during long-distance transportation, the temperature of the steam is intentionally kept a bit higher… In other words, during the process of heat loss, the steam remains in gaseous form so that water does not condense. The above explanation is provided for your understanding

Okay, thank you! I have another question: when using a superheated steam turbine, the pipes need to be heated first before pressure is increased. How should we understand the need to increase pressure in order to prevent water hammer? Isn’t water hammer caused by unsaturated steam? What impact does this have on the pressure levels in the pipes? ?