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Dear All,
We have Fr-5 Mk6 control GT. Our machine is a dual fuel system. When the turbine is running in fuel gas mode, there is NO problem in exh. temp. spread. But in Distillate fuel mode, we have slight spread ,close to allowable spread.
But , I am interested to calculate/verify the allowable spread shown in the print out of the turbine parameters while the turbine was running in fuel gas mode at 17.1 MW.without any spread problem.{spread Normal}
The values noted are as follows:-
TTXM 491 deg.C
Max. CTDA 328 deg.C
TTXSPL 62 deg.diff
TTXSP1 23 deg.diff
TTXSP2 20 deg.diff
TTXSP3 18 deg.C
As per the GT manual, Mk6 algorithm TTXSPV4 is used for spread calculation and TTXSPL calculation is defined as:
TTXSPL = TTKSPL4* TTXM - TTKSPL3*CTDA + TTKSPL5
where TTXSPL4 = 0.145PU {comb.monitor TX gain constant}
TTXSPL3= 0.080PU {CTD limit gain}
TTXSPL5= 30 deg.F{CTD limited Exh.temp.offset}
When I substitute the a/m values in the TTXSPL formula, I don't get the result of 62 deg{TTXSPL} as shown in the print out.
Kindly someone guide me for the correct way of calculating the Allowable spread.
Thanx in advance...
We have Fr-5 Mk6 control GT. Our machine is a dual fuel system. When the turbine is running in fuel gas mode, there is NO problem in exh. temp. spread. But in Distillate fuel mode, we have slight spread ,close to allowable spread.
But , I am interested to calculate/verify the allowable spread shown in the print out of the turbine parameters while the turbine was running in fuel gas mode at 17.1 MW.without any spread problem.{spread Normal}
The values noted are as follows:-
TTXM 491 deg.C
Max. CTDA 328 deg.C
TTXSPL 62 deg.diff
TTXSP1 23 deg.diff
TTXSP2 20 deg.diff
TTXSP3 18 deg.C
As per the GT manual, Mk6 algorithm TTXSPV4 is used for spread calculation and TTXSPL calculation is defined as:
TTXSPL = TTKSPL4* TTXM - TTKSPL3*CTDA + TTKSPL5
where TTXSPL4 = 0.145PU {comb.monitor TX gain constant}
TTXSPL3= 0.080PU {CTD limit gain}
TTXSPL5= 30 deg.F{CTD limited Exh.temp.offset}
When I substitute the a/m values in the TTXSPL formula, I don't get the result of 62 deg{TTXSPL} as shown in the print out.
Kindly someone guide me for the correct way of calculating the Allowable spread.
Thanx in advance...