Hangzhou valve focuses on scientific and technological innovation and cooperation in production, learning and research. Currently, it has more than 70 national patents, including temperature reduction and pressure reducing devices, safety valves, among which, 8 patents are invention.
BYPSS PRESSURE REDUCING DESUPERHEATER SYSTEM
Bypass-GWY801-MX is the pressure reducing desuperheater system for turbine bypass applications, also called turbine bypass PRDS. It is one of the most critical systems in the power plant, allowing operation of the boiler independent of the turbine and also providing steam at the same pressure and temperature as the turbine steam expansion process. With this capability, the turbine bypass valve is used in start-up and rapid ramp down modes, protecting the turbine, boiler and condenser from damaging thermal and pressure excursions.
Available inlet pressure: P1<17.0 MPa
Available inlet temperature: T1<570 DegreeC
Available Inlet flow rate: 10%~100%
Outlet pressure controlling accuracy:
P2<0.98 MPa, accuracy range: ±0.04MPa
0.98 MPa<P2<3.82 MPa, accuracy range: ±0.06MPa
P2>3.82 MPa, accuracy range: ±0.15MPa
Outlet temperature controlling accuracy: ±4 DegreeC
Noise Level: <85 dbA
Minimum distance of Temperature Sensor from the point
of water injection should be 10 to 12 mtrs
It is recommended to install a strainer of 0.8 mm mesh
before water control valve
Spray water should be very clean (equivalent to boiler
Instrument quality air is required
Inlet isolation valve is needed
Floor support to safety valve is needed
Apply with forged pressure reducing valve of angle structure, designed specifically to handle severe thermal shock conditions normally associated with turbine bypass applications
Multi-stage piston trim design gives rapid start-up and shut off capacity, the piston is guided in two areas, with long guiding surfaces and not subject to distortion.
High performance and quick operation pneumatic actuator or Electro-hydraulic actuator is selected, which gives quick action in 5 seconds or even less time for PRDS moving into operation
The multi nozzles provide excellent atomization over a wide range of spray flows. The design optimizes the cooling liquid particle size so that quick evaporation can take place.
The high performance feed water control valve is assembled and gives accurate water supplying to the spray nozzles for desuperheating.