During performance test for steam turbine with low temperature economizer

the operating boundary conditions of the low temperature economizer cannot be completely the same as the design values due to the uncertainty caused by fluctuation of operation parameters and environmental factors. As a result

the measured heat rate of the steam turbine and energy saving of the low temperature economizer cannot be directly compared with the design values. In this paper

against a typical thermal power unit with low temperature economizer

three methods for performance correction calculation of the steam turbine and low temperature economizer with different test purposes were proposed. For purpose one which is acceptance performance test of steam turbine with low temperature economizer

seven correction precepts are proposed. The comparison results show that

there are five feasible methods to calculate heat rate of the steam turbine

in which the maximum deviation between the maximum and the minimum value is 12.4 kJ/(kW·h)

which is larger

indicating that the buyer and the seller of low temperature economizer should determine the correction calculation method before the test. For purpose two which is acceptance performance test of energy saving of low temperature economizer

the coefficient λ

product of flue gas flow and specific heat capacity

is proposed to correct operation parameters of the low temperature economizer. The example results show that

the design values of heat absorption and energy saving are 36.28 MW and 29.0 kJ/(kW·h)

and the measured values are 14.93 MW and 4.9 kJ/(kW·h)

but the corrected values are 27.92 MW and 19.2 kJ/(kW·h) respectively

the deviation between the corrected values and design values indicates the heat transfer characteristics of the low temperature economizer do not meet the design requirements. For purpose three which is performance test of steam turbine body when the low temperature economizer cannot be cutting out. The results show that

the deviation between the heat rate of steam turbine obtained by the corrected calculation method in this paper and measured by the low temperature economizer cut-out performance test is 0.002 6%

which meets the needs of engineering application. The results of this paper can provide reference for performance test of thermal power units equipped with low temperature economizer.