Can the temperature of superheated steam be increased significantly?
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Can a boiler with a pressure of 12.5 MPa produce superheated steam at 5.5 MPa and 520 degrees? The designed operating conditions are 12.5 MPa and 530 degrees.
Personally, I believe that based on the PV=nRT equation, it is very difficult to achieve a decrease in pressure while keeping the temperature constant.
Haha, the temperature at which water turns into steam is directly related to pressure; when the pressure is reduced, it becomes difficult to heat the water until it turns into steam!
Have any fellow sea travelers had such an experience? After passing through the temperature reducer, the temperature drops significantly; I’m afraid it won’t reach the required level.
For steam, superheating is possible; our 0.45 MPaG steam has been superheated to 360°C. But by doing this, you reduce the pressure from 12.5 MPa to 5.5 MPa, while the temperature drops from 530 degrees to 520 degrees. I think it’s unlikely. This is a process of doing work on the outside, and I’m not sure whether a ten-degree temperature drop will be sufficient; but I’m not going to do the calculations either. Where did you get this data from? Was it designed for that purpose? Design institutes are much better at calculations than we are.
The saturation temperature corresponding to 125 bar is 328 degrees; how could it reach 530 degrees? Would that dry out the boiler?
Saturated steam only needs to be superheated in a superheater. The steam entering the turbine requires a certain degree of superheat.
When all the water in the wet saturated steam vaporizes, it becomes dry saturated steam; at this point, the temperature of the steam remains at the boiling point. If saturated steam is further heated, raising its temperature above the boiling point, the resulting steam is known as superheated steam. As the temperature increases, the pressure of superheated steam is higher than that of saturated steam; therefore, if it is necessary to modify existing steam pipes, attention must be paid to the design pressure and design temperature of those pipes.