A piece of common sense
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Dear experts, regarding the utilization of waste heat, I understand that steam of different qualities can be used in different applications. I would like to know the specifics of this. For example, in power generation, what state of steam is generally required? Wait, thank you
Of course, steam is used for power generation; in conventional subcritical units, the steam parameters are around 540 degrees and a pressure of 16.7 MPa. In supercritical units, the steam temperature remains similar, but the pressure reaches almost 20 MPa. In ultra-supercritical units, the pressure is around 27 MPa. The higher the steam parameters and pressure, the higher the efficiency. Low-quality steam should be the result of vacuum extraction, which reduces the pressure and thus the superheat. A lower superheat means that the steam condenses quickly after releasing its heat, and this type of low-quality steam can be used in heat exchangers. Waste heat should refer to the vapor remaining after pumping; if its temperature is still high, it should be recovered. For heat exchange.
Currently, low-temperature waste heat power generation uses steam at 1.6–2 MPa with a superheating temperature of 300°; steam at 0.5 MPa is generally used for deoxidization.
Of course, superheated steam is used for power generation. As for the steam pressure range, it depends on the source of waste heat being utilized; cement kilns generally use low-temperature waste heat for power generation, while the flue gases in the metallurgical industry are at higher temperatures, allowing for pressures of around 4.5 Mpa
Waste heat... How high will the quality of the steam be? Of course, in terms of its applications, the higher the steam pressure and temperature, the greater its utility value
It’s undoubtedly superheated steam; if the steam contains water, it will cause serious problems for the steam turbine
Superheated steam! And it is required not to bring water, as bringing water will cause corrosion of the impeller!