Abstract
This paper studies the problems of high exhaust pressure and low economic efficiency caused by the uneven flow field at the exit of the steam turbine exhaust channel. This paper uses CFD simulation software to carry out numerical simulation on the steam turbine exhaust passage, and obtains a layout of the guide device that can greatly improve the uniformity of the flow field at the exit of the exhaust passage. This optimization scheme was applied to a domestic 600MW steam turbine unit for performance comparison and economic analysis before and after optimization. The results show that the average pressure of the condenser drops by about 0.704kPa. The coal consumption for power generation drops by about 0.525g/kWh. The annual standard coal saving is about 1729t. Therefore, installing a suitable diversion device can improve the operating efficiency of the unit, and has better economical efficiency and energy saving and emission reduction effects.
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