Steam distribution method for steam turbine nozzles based on the difference of vane angles of regulating stages

A level-adjusting and differentiated technology, applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problem that the main steam pressure does not reach the optimal value, the area does not reach the optimal match, and the partial load economy of the nozzle steam turbine is affected To improve the main steam pressure and improve the economy

Active Publication Date: 2021-03-09
DONGFANG TURBINE CO LTD
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Problems solved by technology

However, due to technical limitations such as the structural design of the steam inlet chamber corresponding to each regulating valve, the part of the steam inlet degree corresponding to each nozzle group cannot be less than a certain value, so that the area of ​​each nozzle group in the regulating stage does not reach the best match, and the steam turbine part The main steam pressure under load does not reach the optimum value, which affects the further improvement of the part-load economy of the nozzle steam turbine

Method used

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  • Steam distribution method for steam turbine nozzles based on the difference of vane angles of regulating stages
  • Steam distribution method for steam turbine nozzles based on the difference of vane angles of regulating stages

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Embodiment

[0029] The steam turbine nozzle steam distribution method based on the difference of the vane angle of the regulating stage, such as figure 2 shown, including the following steps:

[0030] a. According to the design input conditions such as the maximum steam inlet volume of the steam turbine, determine the total flow geometric parameters of the adjustment stage nozzle group;

[0031] b. Determine the through-flow geometric parameters of the first nozzle group 31 according to the difference between the rated steam inlet volume and the maximum steam inlet volume of the steam turbine; obtain the through-flow geometric parameters of the second nozzle group 32 according to the mid-face structure of the adjustment stage;

[0032] c. According to the premise that the two valves can meet the steam intake under the target load of the unit when the two valves are fully opened, and the main steam pressure under the load is as close as possible to the rated pressure as the goal, the flo...

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Abstract

The invention discloses a steam distribution method for a steam turbine, in particular a steam distribution method for a steam turbine nozzle based on the differential angle of the stator blades of the regulating stage, which belongs to the technical field of steam turbine devices; The two design methods further reduce the effective flow area of ​​the regulating stage under partial load, increase the main steam pressure of the unit, realize the best match between the flow area of ​​each nozzle group and the main steam pressure, and dig deeper into the nozzle steam distribution The efficiency improvement potential of the steam turbine at part load can significantly improve the economy of the part load of the steam turbine generator set.

Description

technical field [0001] The invention relates to a steam distribution method of a steam turbine, in particular to a steam distribution method of a steam turbine nozzle based on the differential angle of a regulating stage stator vane, and belongs to the technical field of steam turbine devices. Background technique [0002] During the operation of the turbo-generator set, its power needs to be adjusted frequently in order to maintain a balance with the grid load. The most important and easy-to-control factor that determines the power of the steam turbine is the steam intake of the steam turbine. Nozzle steam distribution is a common way of regulating the flow of steam turbines, and its first stage is a regulating stage with a variable degree of partial steam intake. Generally, the vanes of the regulating stage are divided into several nozzle groups (4 groups are commonly used in large steam turbine generator sets), and are connected with the same number of regulating valves....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D17/16F01D9/04
Inventor 孙奇钟刚云贺伟雷晓龙何磊赖强
Owner DONGFANG TURBINE CO LTD
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