Economic Research And Thermal Consumption Analysis On Energy Saving Reconstruction Of A 350MW Steam Turbine

Steam turbine is the main equipment which affects the thermal efficiency of a power plant. It has a great potential for energy conservation and energy consumption reduction. The energy conservation analysis of steam turbine is extremely important to improve the thermal efficiency of steam turbine and reduce the heat consumption.The steam seal of steam turbine is an important factor affecting the operation safety and the thermal efficiency. Modifications for steam seals can improve the thermal efficiency and reduce the energy consumption of a steam turbine.First of all, the calculation method and equations for heat consumption rate are summarized and analyzed to provide a theoretical basis for energy conservation transformations of steam turbines. Secondly, the working principles are anzlyzed for several types of steam glands commonly used in steam turbines. The advantages and disadvantages of the steam glands are then discussed for the practical operation. The energy conservation transformations of the domestic steam turbine gland experience and achievements are also summarized to provide practice basis for the power plant steam seal modification. The performance characteristics and problems of the gland sealings of a 350 MW supercritical turbine unit are analyzed. Transformation schemes of gland sealing systems for the 350 MW power unit are presented to improve the relative internal efficiencies, heat consumption rate and coal consumption rate. The performance characteristics of the steam turbine are analyzed after the gland sealing transformations. The analysis results show that the relative internal efficiencies for high pressure cylinder, intermediate pressure cylinder and low pressure cylinder increase while the heat consumption rate and the coal consumption rate of the power unit decrease obviously. The steam seal transformations for the 350 MW power unit improve the thermal efficiency and show good social benefits.