Abstract: Based on the equivalent enthalpy drop theory and the small deviation analysis model, a method is derived to calculate the corrections of the monitoring section parameters with other related parameters converted to unified boundary conditions (design parameters). The reference for the flow path performance variation analysis is also unified. The misunderstanding in judging the flow path performance by calculating the deviation between the monitored parameter and the designed value is discarded. By using the simplified Friuli Greig Formula and the reheat theory, a new method to calculate the energy-consumption sensitivity is proposed, which can avoid deeply nested iterative process and realize fast calculation. The method is proved by performance experiments. It is concluded that this method can figure out the main reasons of the flow path performance variation, and obtain the energy-consumption sensitivity of the efficiency of each cylinder and the energy-consumption sensitivity curve of various units.

Key words: cylinder admission parameter, analysis reference of flow path performance change, cylinder efficiency, energy-consumption sensitivity