BVT-DLB steam attemperator
Attemperation is used for controlling the degree of superheat in a Heat Recovery Steam Generator (HRSG) or a boiler. Water is injected into the steam pipe using a series of spring loaded atomizing nozzles. Attemperators are installed between the superheater stages in order to protect any secondary superheater pipes from damage owing to excessive heat, called “inter-stage”. Another attemperator is often placed after the boiler / HRSG to regulate the output temperature of the boiler / HRSG or to ensure that the temperature upstream the turbine does not rise too quickly. The BVT-DLB has a welded flow profiling liner for superior evaporation and performance.
Key features
- Very high reliability due to being able to handle thermal cycling
- Flow profiling liner as standard
- Designed to handle large spray water flow
- Nozzles resistant to flashing
- Water atomization pressure is maintained at each nozzle at any flow condition
- Even distribution of spray water in the steam pipe
- Negligable pressure drop in the steam line
Specifications
Rangeability
Determined by spray water valve
Pressure class
EN PN 16-320
ASME 150-2500
Design temperature
Steam – 630 °C
Water – 250 °C
Materials
| Nozzle body/plug | Inconel 718 |
| Spring | Heat resistant spring steel |
| Steam pipe/liner | Adapted to connecting pipe materials |
| Water pipes | X10CrMoVNb91, A-182 F91 13CrMo44, A335-P11 or St35.8, A105 or 10CrMo9-10, A-335 P22 |
Nozzles and springs are also available in Inconel for high temperature applications or conditions without water injection.