HP bypass

Tasks

HP bypass with secondary injection type DUV-C4

Ensures safe flow through the reheater and independent operation of the steam generator, even when the turbine inlet is closed. Takes over live steam regulation during start-up and shutdown, as well as during load shedding and malfunctions. During variable pressure operation, also maintains the safety functions if the boiler design pressure is exceeded.

 

 

 

Versions

Forged housing in angled form

Advantages

  •  Integrated motive steam nozzle for optimum steam conversion throughout the load range
  •  Individual adaptation of all restrictor stages to the operating parameters
  •  Rapid steam cooling, particularly at partial load
  •  Installed silencers for low-noise and low-vibration operation
  •  Low cooling water pressure – easily replaceable interior parts for simple maintenance

IP/LP bypass

Tasks

IP/LP bypass with secondary injection, type E20

The IP/LP bypass station connects the hot reheater in the bypass to the IP/LP turbine with the condenser. If the turbine is not in operation during start-up and shutdown, the steam generated in the reheater must be discharged via the IP/LP bypass station to the turbine condenser, bypassing the medium and low-pressure turbine . The secondary injection cools the steam from the hot reheater sufficiently to ensure that the condenser does not suffer any damage.

Versions

Forged housing in angled form

Advantages

  •  The pressure-controlled nozzles open sequentially for optimum cooling throughout the entire load range
  •  Optimised spray angle and minimal droplet size
  •  Compact design with control piston to reduce steam pressure
  •  All wear parts can be replaced on site
  •  Installed silencers for low-noise and low-vibration operation
  •  Suitable for high-temperature applications
  •  Available with dump tube designed for specific application

 

The cooling water is injected via pressure-controlled nozzles according to the steam flow. Depending on the cooling water flow, the nozzles in the centre are opened first. The other nozzles are opened as the cooling water flow increases. The axially aligned nozzles in the steam flow ensure an even temperature distribution in the exhaust steam pipe.

 

For large outlet diameters, the special solution Type E40 is available.

Combination valve

Tasks

Control section:

The control section of the inlet combination regulates the steam entering the steam turbine. At low steam flow ranges, when the turbine is being brought up from turning speed to synchronisation speed, stable regulation must be achieved through a good adjustment ratio. 

 

Trip section:

The trip section protects the turbine and must be able to stop the steam mass flow completely in less than 1 second.

Versions

The trip and control sections are mounted in opposite directions in the same forged housing. Horizontal and vertical designs are both possible.

Advantages

  •  Compact design with only one housing.
  •  Stable regulation
  •  TRD 421 equipment possible