Turbine low-pressure steam admission mode and equipment

Abstract

The invention discloses a turbine low-pressure steam admission mode. Low-pressure steam admission flow channel molded lines of a turbine are of a double-helix structure, the turbine is provided with an inner side flow channel and an outer side flow channel, and the steam admission angle of the inner side flow channel differs by the radian pi from that of the outer side flow channel; a part of steam flows into a low-pressure through-flow level while the part of the steam forms detouring flow in the inner side flow channel, and after circularly flowing for a semi-cycle to form detouring flow in the outer side flow channel, the other part of the steam flows into the low-pressure through-flow level, so that the flow velocity of the steam at all cross sections of the flow channels is evenly distributed, and the temperature and pressure loss of steam admission is reduced; and the steam admission quantity tends to be distributed evenly in the circumferential direction of the low-pressure first level, and efficiency of the low-pressure first level is improved.

Description

technical field [0001] The invention relates to a high-power steam turbine low-pressure cylinder structure design technology, in particular to a high-power steam turbine low-pressure steam intake method and device. Background technique [0002] A steam turbine is a rotating power machine that converts steam heat energy into mechanical energy, and is one of the important power equipment of a thermal power plant. Improving steam turbine efficiency is one of the important means to effectively improve the overall efficiency of power plants, reduce coal consumption, save energy and reduce emissions. For steam turbines, the efficiency of the low-pressure cylinder is relatively low, which has a great impact on the economy of the entire unit. By improving the efficiency of the low-pressure cylinder, the efficiency of the steam turbine can be effectively improved and the heat consumption of the steam turbine can be reduced. [0003] For the low-pressure cylinder, not only the loss o...

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Problems solved by technology

[0005] However, there is still a defect in this structure, that is, during the flow of the inlet steam, fluid is continuously separated from the main flow, and the flow velocity distribution of the steam flow in each section of the flow channel is uneven. The small structural design can improve the situation of uneven flow velocity distribution, but because the steam channel needs to surround a circle, it is still not enough to make the flow velocity distribution of the incoming steam uniform, and there is still a loss of incoming steam; the amount of incoming steam is distributed in the circumferential direction of the low pressure first stage Inhomogeneity, which has an adverse effect on the efficiency of the first stage of low pressure, needs further improvement

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