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Why steam needs to be reduced pressure

Cowinns Cowinns 2020-06-01 18:03:46
Why steam needs to be reduced pressure

When the steam is delivered from the boiler from the high-pressure output to the steam point of each equipment, decompression control is often performed. Why does steam need to be decompressed?

     1. The boiler usually produces high-pressure steam, which can reduce the size of the boiler, reduce the occurrence of wet steam, improve the steam dryness, and carry out long-distance transportation.

     2. It is caused by the density change of steam. The steam density is high at high pressure. The pipeline with the same caliber 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. For high pressure steam pipeline Cowinns can supply WC6 pressure seal gate valve.

     3. Condensation will occur when steam is used. The decompressed steam reduces the pressure of the condensed water to avoid the loss of flash steam when the condensed water is discharged. The energy loss of the condensed water at low pressure is small.

     4. Since the temperature and pressure of the saturated steam are corresponding, a pressure relief valve will be installed in the sterilization process and the surface temperature control of the paper dryer to control the pressure, thereby controlling the temperature of the process equipment.

     5. The process equipment has its own design pressure. When the supplied steam pressure exceeds the requirements of the process system, it needs to be depressurized. When some systems use high-pressure condensate to generate low-pressure flash steam, to achieve energy-saving purposes. When the generated flash steam is insufficient, it is necessary to generate low-pressure steam through the pressure reducing valve.

    6. The steam load of the boiler can be reduced because the enthalpy of steam is higher at low pressure. The enthalpy value at 2.5MPa is 1839kJ / kg, and the enthalpy value at 1.0MPa is 2014kJ / kg. Therefore, low-pressure steam is more suitable for equipment use.

     For the use of steam pressure reducing valves, users are particularly concerned about how they can be used well and how to meet the actual needs of application equipment. First of all, you need to understand the basic categories of steam pressure reducing valves and their respective advantages and disadvantages. Besides steam pressure reducing valves there is super high temperature gate valve will be installed in high pressure steam pipeline.