Green Energy
The first out indication of MFT at BMS was (Drum level HH). “
There were a lot of discussion and arguments about what is the cause of this accidents , and what should operators do ?
I attached A chart Table shows the different parameters changed at each same time !! , If any one has an opinion about what happened , plz tell me !!
TREND_OPERATION_PARAMETERS
- Load Swing Test
YESTERDAY , We made a test at our power station ( 2*350 MW - Gas/Oil Fired ) , this test is LOAD SWING TEST. This test is implies the load of the unit at 350MW , for a while . and collect our data from the unit especially the boiler and Turbine...
- Load Rejection Test (governor Test)
The purpose of Turbine Load Rejection Test is to verify and demonstrate the governor function to sustain a load rejection in order to prevent the turbine from overspeed tripping, steady speed control at no-load operation and remain in service without...
- Boiler Control Theory (feed Water Control)
Boiler Control Theory (Feed water Control) The feed water is controlled to keep the drum level . Water-level controls continuously monitor the level of water in a steam boiler in order to control the flow of feed water into the boiler and to protect...
- { Boiler And Turbine } Control Modes
Boiler Master (Firing Rate Demand) Boiler Master (basic firing rate demand) computation is dependent on the Current operating mode like Coordinated mode, Boiler Follow mode, Turbine Follow mode,Manual mode. This demand is transmitted in parallel to...
- Discussion About Previous Post (over Frquency Happened At A Windy Winter Night)
After I discussed what happened the outage three days ago - the situation I posted previously - I found an explanation for that: - In winter days , Electrical loads are decreasing here in Egypt especially at night , therefore the frequency increases...
Green Energy
Over Frquency happened at a windy winter night..
SUNDAY, DECEMBER 12, 2010
“ at 3:00 am , A sudden frequency fluctuation happened , that cause the MW output fluctuate with the grid frequency , Unit 7 was at Coordinated Mode ( Boiler Master – Auto , Turbine Set – Auto ) , The load fluctuated accordingly to the frequency from 105 MW to 90 MW, and increased to 105 MW.
After a little time, frequency reached 50.1 HZ – therefore the MW output reached 20 MW,
Also, Boiler Master responds by reducing Air Flow and Fuel Gas Flow for the boiler. The load still decreased until it reached 2 MW, and to (-2 MW), without coming the signal of Reverse Power.
At this instant we trip the turbine manually.
We wanted to conserve the boiler to be in service, but HP-TBV opens widely within 30 sec., and sucking all drum level to +267 mm, resulting MFT Protection to the boiler.
There were a lot of discussion and arguments about what is the cause of this accidents , and what should operators do ?
I attached A chart Table shows the different parameters changed at each same time !! , If any one has an opinion about what happened , plz tell me !!
TREND_OPERATION_PARAMETERS
- Load Swing Test
YESTERDAY , We made a test at our power station ( 2*350 MW - Gas/Oil Fired ) , this test is LOAD SWING TEST. This test is implies the load of the unit at 350MW , for a while . and collect our data from the unit especially the boiler and Turbine...
- Load Rejection Test (governor Test)
The purpose of Turbine Load Rejection Test is to verify and demonstrate the governor function to sustain a load rejection in order to prevent the turbine from overspeed tripping, steady speed control at no-load operation and remain in service without...
- Boiler Control Theory (feed Water Control)
Boiler Control Theory (Feed water Control) The feed water is controlled to keep the drum level . Water-level controls continuously monitor the level of water in a steam boiler in order to control the flow of feed water into the boiler and to protect...
- { Boiler And Turbine } Control Modes
Boiler Master (Firing Rate Demand) Boiler Master (basic firing rate demand) computation is dependent on the Current operating mode like Coordinated mode, Boiler Follow mode, Turbine Follow mode,Manual mode. This demand is transmitted in parallel to...
- Discussion About Previous Post (over Frquency Happened At A Windy Winter Night)
After I discussed what happened the outage three days ago - the situation I posted previously - I found an explanation for that: - In winter days , Electrical loads are decreasing here in Egypt especially at night , therefore the frequency increases...