Question

On a full-load test of a steam turbine/generator set turbine with the turbine is governed by throttling, the output power at terminals \( =10 \mathrm{MW} \), steam consumption \( =12.5 \mathrm{~kg} / \mathrm{s} \), steam conditions in nozzle box \( =27 \) bar \& \( 378^{\circ} \mathrm{C} \), steam pressure at exit \( =0.07 \) bar. It is estimated that the power loss duc to bearing friction, governor, and oil-pump drive, etc., amounts to 110 kW . Assuming that the generator efficiency is \( 95.5 \% \). (Assume that the turbine efficiency ratio, the mechanical losses in kW . the pressure at evit, and the generator efficiency are the same as at full load). calculate: a) the true internal efficiency ratio of the turbine at full load ? b) the output of the generator when the steam consumption is \( 1 / 2 \) of that at full load? c) the no-load steam consumption in ( \( \mathrm{kg} / \mathrm{s}) \).

          On a full-load test of a steam turbine/generator set turbine with the turbine is governed by throttling, the output power at terminals \( =10 \mathrm{MW} \), steam consumption \( =12.5 \mathrm{~kg} / \mathrm{s} \), steam conditions in nozzle box \( =27 \) bar \& \( 378^{\circ} \mathrm{C} \), steam pressure at exit \( =0.07 \) bar. It is estimated that the power loss duc to bearing friction, governor, and oil-pump drive, etc., amounts to 110 kW . Assuming that the generator efficiency is \( 95.5 \% \). (Assume that the turbine efficiency ratio, the mechanical losses in kW . the pressure at evit, and the generator efficiency are the same as at full load).
calculate:
a) the true internal efficiency ratio of the turbine at full load ?
b) the output of the generator when the steam consumption is \( 1 / 2 \) of that at full load?
c) the no-load steam consumption in ( \( \mathrm{kg} / \mathrm{s}) \).

On a full-load test of a steam turbine/generator set turbine with the turbine is governed by throttling, the output power at terminals =10 MW, steam consumption =12.5 kg / s, steam conditions in nozzle box =27 bar & 378^∘C, steam pressure at exit =0.07 bar. It is estimated that the power loss duc to bearing friction, governor, and oil-pump drive, etc., amounts to 110 kW . Assuming that the generator efficiency is 95.5 %. (Assume that the turbine efficiency ratio, the mechanical losses in kW . the pressure at evit, and the generator efficiency are the same as at full load).
calculate:
a) the true internal efficiency ratio of the turbine at full load ?
b) the output of the generator when the steam consumption is 1 / 2 of that at full load?
c) the no-load steam consumption in ( kg / s).

Added by Samuel W.

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