Pressure & Temperature Reduction System
Functions:
Desuperheating water to be spayed into the high-temperature and high-pressure primary steam to reduce the temperature and pressure so that the end-user required secondary steams can be produced to meet industrial production needs.
Classifications:
- By Structures
- Integral type
Both temp. and pressure reduction process are completed inside the valve body
- Split type
Temperature reduction and pressure reduction are separately processed
♦ Pressure reduction realized by pressure reducing valves and throttling orifice plates
♦ Temperature reduction occurred inside the pipeline
- By Arrangements
- Horizontal arrangement
- Vertical positioned
- Z-type arrangement
Parts & Components:
- Pressure Reducing System
Composed of a pressure reducing valve, orifice plate and transition tube to achieve pressure and noise control.
- Water Spray System
Regulating valve to control the flow of desuperheated water.
CE nozzles to ensure desuperheating water atomizating.
Filter valve to ensure the desuperheating water free of impurity particles.
- Safety Protection System
Safety valve to prevents overpressure operation
Check Valve to prevents backflow of steam feeding pipe
Protective casing to protect steam piping
- Automatic Control System
Control cabinets (DCS): logic calculations
Pressure transmitter: pressure signal
Thermocouple: temperature signal
Pressure reducing valve actuator: control pressure
Regulating valve actuator: temperature control
Structure Feathers:
- Equipped with steam protection sleeve
It effectively prevents the desuperheating water from splashing onto the piping wall which may generate alternating thermal stresses. As a result, steam piping does not crack and prevent the occurrence of safety accidents.
- Spring loaded atomizing nozzle assembly
The nozzle assembly consists of nozzle, spray rod, spring, nut and body. The spray rod under the combined action of of spring and the media forces automatically adjust the opening as per the flow to maintain the differential pressure at Min. 0.3MPa to achieve the best atomization of the desuperheating water under fluctuating operating conditions.
- Adjustable nozzles
- Regulation & water spray integrated
Number of nozzles controllable through the regulating valve to achieve variable and more precised control of flow rate.
- Removable nozzle
Nozzles can be freely removed and replaced with easier repaire and maintenance.
- Noise control <85db
a) Precise calculation for pressure reduction ratio to minimize the noise generation.
b) Cage type design to employed for high differential pressure valves to reduce noise generation.
c) Throttle plate introduce to reduce noise generation.
Materials for Main Parts & Components:
A: Inlet operating temperature ≤425℃
|
Part Name |
Material |
|
Steam pipe (inlet) |
20G |
|
Steam pipe (outlet) |
20G |
|
Protective casing |
20G |
|
Nozzles |
30Cr13 |
|
Water pipes |
20G |
|
Component Name |
Main Materials |
|
Pressure reducing valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Shrouded: 38CrMoAlA; Sealing surface :STL |
|
Regulating valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Shrouded: stainless steel; Sealing surface :STL |
|
Safety valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Sealing surface :STL |
|
Check valve |
Body and bonnet: carbon steel; Disc: alloy steel; Sealing surface :STL |
|
Globe Valve |
Body and bonnet: carbon steel; Disc: alloy steel; Stem: stainless steel |
|
Filter valve |
Body and bonnet: carbon steel; Filter screen: stainless steel; |
B: Inlet steam operating temperature 555℃
|
Part Name |
Material |
|
Steam pipe (inlet) |
12Cr1MoVG |
|
Steam pipe (outlet) |
20G |
|
Protective casing |
12Cr1MoVG |
|
Nozzles |
30Cr13 |
|
Water pipes |
20G (Cold section) |
|
Water pipes |
12Cr1MoVG (Hot section) |
|
Component Name |
Main Material |
|
Pressure reducing valve |
Body and bonnet: alloy steel; Stem: 38CrMoAlA; Seat: stainless steel; Shrouded: 38CrMoAlA; Sealing surface :STL |
|
Regulating valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Shrouded: stainless steel; Sealing surface :STL |
|
Component Name |
Main Material |
|
Safety valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Sealing surface :STL |
|
Check valve |
Body and bonnet: alloy steel; Disc: alloy steel; Sealing surface :STL |
|
Globe Valve |
Body and bonnet: carbon steel; Disc: alloy steel; Stem: stainless steel |
|
Filter valve |
Body and bonnet: carbon steel; Filter screen: stainless steel; |
C: Inlet steam operating temperature 575℃
|
Part Name |
Material |
|
Steam pipe (inlet) |
12Cr1MoVG |
|
Steam pipe (outlet) |
20G/12Cr1MoVG |
|
Protective casing |
12Cr1MoVG |
|
Nozzles |
30Cr13 |
|
Water pipes |
20G (Cold section) |
|
Water pipes |
12Cr1MoVG (Hot section) |
|
Component Name |
Main Material |
|
Pressure reducing valve |
Body and bonnet: F91; Stem: 20Cr1Mo1VNbTiB ; Seat: stainless steel; Shrouded: 20Cr1Mo1VNbTiB ; Sealing surface :STL |
|
Regulating valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Shrouded: stainless steel; Sealing surface :STL |
|
Component Name |
Main Material |
|
Safety valve |
Body and bonnet: carbon steel; Stem: stainless steel; Seat: stainless steel; Sealing surface :STL |
|
Check valve |
Body and bonnet: alloy steel; Disc: alloy steel; Sealing surface :STL |
|
Globe Valve |
Body and bonnet: carbon steel; Disc: alloy steel; Stem: stainless steel |
|
Filter valve |
Body and bonnet: carbon steel; Filter screen: stainless steel; |
