GTG-HRSG Startup
GTG-HRSG Startup
(OP)
Hi,
In 4 to 6 months time we are planning to commission 4 GTGs (F5 size) and 4 HRSGs (95 t/h with supplementary firing). Our gas turbine is closed coupled with the HRSG without the bypass stack i.e. if GTG down, HRSG will also down, vice versa.
I was informed that due to not having a bypass stack, it will take longer time for the GTG to reach its full rated capacity. For cold standby it will take 7 hours. For hot standby it will take 3 hours. The reason is to reduce the thermal shock on the HRSG tube. Is that really the case? I just feel this is too long and my understanding is that GTG is always a fast response machine.
Thanks
norzul
In 4 to 6 months time we are planning to commission 4 GTGs (F5 size) and 4 HRSGs (95 t/h with supplementary firing). Our gas turbine is closed coupled with the HRSG without the bypass stack i.e. if GTG down, HRSG will also down, vice versa.
I was informed that due to not having a bypass stack, it will take longer time for the GTG to reach its full rated capacity. For cold standby it will take 7 hours. For hot standby it will take 3 hours. The reason is to reduce the thermal shock on the HRSG tube. Is that really the case? I just feel this is too long and my understanding is that GTG is always a fast response machine.
Thanks
norzul





RE: GTG-HRSG Startup
RE: GTG-HRSG Startup
If you have the capital to spend and the need for power to justify it, you ought to do it. There are companies who build diverter dampers specifically for this service, and I have seen them used on Frame 5's quite a lot.
Try www.effox.com for a starter. I think you will find some examples of what you are looking for on their site.
rmw