【Daily Question No. 71】June 20, 2021
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【Daily Question No. 71】June 20, 2021: A low inlet temperature of the turbine leads to an increase in steam consumption. True or False ( ) Please answer within two days.
Correct, low steam inlet temperature can also lead to water erosion
Correct. A decrease in the steam inlet temperature reduces the enthalpy drop of the steam within the turbine, resulting in a decline in the turbine’s power output and a reduction in its efficiency. As the steam inlet temperature decreases, the specific volume of the steam reduces. With the opening of the throttle valve remaining unchanged, the steam flow rate increases, resulting in overload in each stage; this in turn leads to increased stress on the blades and diaphragms of the last stage of the turbine. A decrease in the steam inlet temperature also causes an increase in axial thrust.