Provision of Bypass Stack
Provision of Bypass Stack
(OP)
Hi,
What are the criteria to install bypass stack between GT and HRSG?
ppm
What are the criteria to install bypass stack between GT and HRSG?
ppm
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Provision of Bypass Stack
|
RE: Provision of Bypass Stack
The bypass stack enables yo to continue generator power even without HRSG (Ofcourse you may not be able to continue for long if the efficiency or environmental controls happen to be overriding issues).
RE: Provision of Bypass Stack
Another criterion worth mentioning is actuation. Pay attention to that. There is a good possibility for unequal expansion, corrosion, and all kinds of ills that will quickly overcome a cheap actuator if you skimp in that area.
rmw
RE: Provision of Bypass Stack
pressure drop, temperature & sealing another criteria.
In a big combined cycle power plant, it is quite common to see bypass stack but again it depends on the above criteria...
RE: Provision of Bypass Stack
Then you don't need bypass stack but during starting of gas turbine, you will have to simultaneously start your steam cycle as well and any trip from steam turbine side also needs to go to the gas turbine.
RE: Provision of Bypass Stack
The only advantage of a bypass is the ability to accelerate the start-up of the combined cycle and also allowing the GT to run by itself.
The leaks, problems and repairs needed by the by-pass system are far more expensive than the benefits...
This arrangement is ONLY somewhat successful in units that start and stop everyday and the bypass is exercised everyday... if the unit starts and the bypass is left in the same position for several hundred hours (even thousands) it is almost guaranteed to have problems when shutting down.
saludos.
a.