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When the steam is transferred from the boiler to the steam point of equipment under high pressure condition, the pressure reduction control is usually carried out. Why does steam need to be decompressed? The main reasons are as follows:
1. The boiler usually produces high-pressure steam, which can reduce the size of the boiler, reduce the occurrence of wet steam, improve the dryness of the steam and carry out long-distance transportation.
2. Due to the change of steam density, the density of the high-pressure steam is high. The same-diameter pipeline can transport high pressure steam more than low pressure steam. The use of high pressure steam will reduce the size of the pipeline and save costs.
3. Condensation will occur when the steam is used. The steam after decompression reduces the pressure of condensate water to avoid the loss caused by flash steam when the condensate water is discharged. The condensate water produces relatively less energy loss under low pressure.
4. Since the temperature and pressure of the saturated steam are corresponding, a pressure relief valve is installed in the sterilization process and the surface temperature control of the paper dryer to control the pressure, so as to control the temperature of the process equipment.
5. The process equipment has its own design pressure. When the steam pressure supplied exceeds the demand of the process system, the pressure needs to be decompressed. Some systems use high pressure condensate water to generate low pressure flash steam, to achieve the purpose of energy saving. When the generated flash steam is insufficient, a pressure relief valve is required to generate low pressure steam replenishment.
6. The steam load of the boiler can be reduced because the steam has a higher heat enthalpy at low pressure. The thermal enthalpy value is 1839kJ/kg at 2.5MPa and the thermal enthalpy value at 2014MPa is 2014kJ/kg. Therefore, low pressure steam is more suitable for equipment use.
For the use of steam pressure relief valves, users are particularly concerned about how to use them well and how to meet the actual needs of the application equipment. First of all, you need to understand the basic categories of steam pressure relief valves and their respective advantages and disadvantages.