External surface temperature pre-testing method and device for high pressure rotor of throttle adjusting type steam turbine
A technology of high-pressure rotor and throttling adjustment, which is applied in the field of steam turbines, can solve problems such as damage to the temperature measuring element, failure to install the temperature of the temperature measuring element, inconvenient maintenance of the temperature measuring element, etc., and achieve the effect of improving reliability
Active Publication Date: 2013-07-31
SHANGHAI POWER EQUIP RES INST
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Problems solved by technology
Due to the rotation of the rotor, it is not possible to install a temperature measuring element for direct temperature measurement
Although it can be approximated by the temperature obtained from the temperature measuring element installed on the inner wall of the inner cylinder of the steam turbine at the corresponding position, the damage of the temperature measuring element at this position is more common, and the maintenance of the temperature measuring element is inconvenient when the steam turbine is running. , Difficulties in operation and outage
Method used
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[0034] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.
[0035] Such as figure 1 As shown, the present invention provides a flow chart of a device for predicting the temperature of the outer surface of the high-pressure rotor of a throttle-regulated steam turbine. Generator set electric power, main steam temperature, main steam pressure, first-stage extraction steam pressure of high-pressure cylinder and exhaust pressure of high-pressure cylinder are 5 parameters, and the pre-trained support vector regression (SVR) model is used to predict the high pressure of the steam turbine through calculation. The temperature of the outer surface of the rotor. The specific implementation is divided into two parts: the training and verification of the offline support vector regression (SVR) model, and the temperature prediction of the online support vector regression (SVR) model.
[0036] Taking a...
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The invention provides an external surface temperature pre-testing method for a high pressure rotor of a throttle adjusting type steam turbine. The method is characterized by comprising the following steps: firstly, building a support vector regression mould, which comprises a step 1.1 a step 1.2, a step 1.3 and a step 1.4, wherein the step 1.1 is to collect and sort the measured data of the steam turbine as a data sample; the step 1.2 is to select the kernel function and the mould parameter; the step 1.3 is to obtain the support vector regression mould and parameter; and the step 1.4 is to test the support vector regression mould; secondly, applying the support vector regression mould. The invention further provides a device. By replacing the high pressure rotor external surface temperature by the predominant value of the method and the device provided by the utility model, the reliability of the steam turbine thermal stress monitoring system is improved, and technical security is provided to the safety of the optimize control of the steam turbine high pressure rotor and the variable load operation of the steam turbine.
Description
technical field [0001] The invention relates to a method and device for predicting the outer surface temperature of a high-pressure rotor of a throttling-regulated steam turbine, belonging to the technical field of steam turbines. Background technique [0002] When the steam turbine starts, stops, and load changes, the steam temperature on the outer surface of the high-pressure rotor changes drastically, while the temperature inside the high-pressure rotor changes relatively slowly, and the temperature difference between the outer surface of the high-pressure rotor and the average temperature of the high-pressure rotor volume is large. The greater the temperature difference between the outer surface of the high-pressure rotor and the average temperature of the high-pressure rotor volume, the greater the thermal stress on the outer surface and the greater the life loss of the high-pressure rotor. Thermal stress on the outer surface can be monitored by monitoring the temperatu...
Claims
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Inventor 杨宇史进渊李汪繁邓志成汪勇
Owner SHANGHAI POWER EQUIP RES INST