Nonlinear automatic undisturbed single valve/sequence valve switching method for steam turbine

A non-disturbance switching and non-linear technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve problems such as large unit power and load disturbance

Active Publication Date: 2013-04-17
NANJING POWER HORIZON INFORMATION TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a non-linear automatic non-disturbance switching method for a single valve or multiple valves of a steam turbine, so as to solve the problem that the existing single-valve steam distribution law and multi-valve steam distribution law will cause the power of the unit to be relatively low in the linear switching mode. The problem of large load disturbances

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  • Nonlinear automatic undisturbed single valve/sequence valve switching method for steam turbine
  • Nonlinear automatic undisturbed single valve/sequence valve switching method for steam turbine
  • Nonlinear automatic undisturbed single valve/sequence valve switching method for steam turbine

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specific Embodiment approach 1

[0047] Specific embodiment one: the method of the present embodiment comprises the following steps: Step 1, definition χ is the integrated flow command, u is the valve opening degree, n is the valve number, then two kinds of steam distribution modes can be expressed as:

[0048] The steam distribution rule of the sequence valve is:

[0049] u 1 = f 1 (χ)

[0050] u 2 = f 2 (χ)…

[0051] u n = fn (χ)

[0052] The steam distribution law of single valve is:

[0053] u ‾ = f ( χ )

[0054] Such as image 3 Two steam distribution laws are shown with four regulating valves. In the case of single valve, the four valves act in unison, and in the case of sequence valve, each valve is opened in sequence.

[0055] Assume that at load point χ 0 switch from a single valve to a sequence valve, from t 1 time starts, t 2 The moment switching process ends,

[0056] At...

specific Embodiment approach 2

[0085] Specific implementation mode 2: a nonlinear automatic undisturbed switching method of a steam turbine single valve or multiple valves in this embodiment, the experimental method determines the switching method: first adjust the valve position u at time t′ i (i=1, 2,..., n and i≠k), then adjust the valve position u k , until the actual flow rate q(t′)=χ 0 , the power remains unchanged at this time, that is, determine the first point on the nonlinear law, repeat the above operations, you can get a series of points on the nonlinear switching law, and then you can get a continuous nonlinear switching law Yes, this step does not require theoretical calculations, the operation is simple, and the accuracy basically meets the needs of actual operation. However, there is randomness in the experimental results in the experimental process. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0086] Specific implementation mode three: a nonlinear automatic non-disturbance switching method for a steam turbine single valve or multiple valves in this embodiment, which is characterized in that the switching method is determined by theoretical calculation: first determine the valve position u at time t′ i (i=1, 2,..., n and i≠k), calculate and keep the actual flow q(t')=χ 0 Required valve position u k , that is, determine the first point on the nonlinear law, repeat the above calculations, you can get a series of points on the nonlinear switching law, and after fitting, you can get a continuous nonlinear switching law. This step requires accurate Theoretical calculations, and the accuracy of the data required for calculations must be ensured to meet the needs of actual operation. But this step does not require experimentation. Other steps are the same as in the first embodiment.

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Abstract

The invention relates to a single valve / sequence valve switching method for a steam turbine, particularly to a nonlinear automatic undisturbed single valve / sequence valve switching method for the steam turbine, and solves the problem that large load disturbance of unit power can be caused in the existing single valve steam distribution law and sequence valve steam distribution law on-line switching mode. The method includes selection of a switching point chi0 and a nonlinear switching valve; switching law optimization design; and determination of a nonlinear switching law of the steam distribution mode by three schemes: the switching method is determined through an experimental method, a theoretical calculation method or an experiment and theoretical calculation combined method.

Description

technical field [0001] The invention relates to a method for switching a single valve or multiple valves of a steam turbine. Background technique [0002] A steam turbine is a rotating machine powered by steam and converts the energy of steam into mechanical work. It is widely used in modern large-scale power generation systems. In order to meet the user's actual demand for electricity consumption, the steam turbine must frequently adjust its power to keep the motor power in balance with the changing load of the outside world. The most direct and effective way to change the power of the steam turbine is to control its steam intake. When the steam intake changes, the power of the steam turbine will also change accordingly, that is, the steam distribution of the steam turbine. [0003] Generally speaking, there are two ways to distribute steam to a steam turbine, namely, single valve and multi-valve (multi-valve can also be called sequence valve). Single valve refers to the ...

Claims

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Application Information

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IPC IPC(8): F01D17/10
Inventor 刘金福万杰宋崇明刘娇马世喜蔡鼎于达仁
Owner NANJING POWER HORIZON INFORMATION TECH CO LTD
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