What are the hazards of excessive temperature and pressure in the hydrogen production deoxygenator?
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Temperature is over 110 degrees, and pressure is around 1.5 MP
Thermal deaeration involves introducing steam into a deaerator and mixing it with water before heating. As the water temperature rises, the partial pressure of steam above the water increases, while the partial pressures of other gases decrease. When water is heated to its boiling point, the partial pressure of vapor above the water surface is almost equal to the total pressure at the liquid surface, while the partial pressures of other gases tend to zero; as a result, the gases dissolved in the water are released from it and removed. Therefore, thermal deaeration is generally controlled at 104°C and 0.02 MPa. The boiling point of water increases as pressure rises; higher pressure leads to a higher water temperature, and this increased temperature can cause vaporization at the inlet of the feed pump, resulting in cavitation in the pump. Cavitation in the pump can only be avoided by increasing the pump’s installation height and raising the inlet pressure of the pump. Therefore, increasing the temperature and pressure of the deaerator has little effect on the deoxygenation process; it only increases energy consumption! ! !
Regarding the process design issue, we are unable to reduce the pressure and temperature of our deaerator; will this lead to cavitation?
The pressure value was entered incorrectly; it should be 0.15 MP
This post was last edited by dpclove21 on 2017-3-30 at 11:20. Cavitation in pumps can be avoided by increasing the pump’s installation height as well as the inlet pressure of the pump. Put simply, the saturation temperature corresponding to 110°C is 0.143 MPa (absolute pressure); therefore, it is necessary to ensure that the inlet pressure of the pump is greater than 0.042 MPa in order to prevent the deoxygenated water from vaporizing
What unit is 0.15mp? 0.15MPa？ ?
Pressure control is generally between 4-20 kPa. Temperature control is set at 102-104 degrees. A higher temperature in the deaerator means that the water seal is more likely to break. What is the unit of pressure used by the poster?