Method for determining inertial element coefficients for calculation of volume average temperature of turbine rotor
A steam turbine rotor and inertial link technology, applied in the steam turbine field, can solve problems such as inappropriateness, and achieve the effect of improving accuracy
Active Publication Date: 2015-01-28
SHANGHAI POWER EQUIP RES INST
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Problems solved by technology
At present, there is no suitable method for determining the time constants and weight coefficients of multiple inertial links
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[0026] In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.
[0027] figure 1 It is a flow chart of a method for determining the inertial link coefficient calculated by the volume average temperature of a steam turbine rotor provided by the present invention. The method for determining the inertial link coefficient calculated by the volume average temperature of the steam turbine rotor is obtained through finite element calculation. The change curve of the volume average temperature of the steam turbine rotor under the conditions of start-stop and load fluctuation. Put the change curve data of rotor outer surface temperature and rotor volume average temperature under the cold state, hot state and extremely hot state start-up conditions of the steam turbine into the optimization objective function. In the optimization objective function, according to the temperature change curve of the outer...
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The invention provides a method for determining inertial element coefficients for calculation of the volume average temperature of a turbine rotor. The method is characterized by comprising the following steps of: 1, setting the inner wall temperature of an inner cylinder of a turbine as the outer surface temperature of a rotor; 2, determining distribution of temperature fields of the rotor by finite element calculation; 3, applying three inertial elements; 4, determining a target function; 5, determining time constants and coefficients of the applied inertial elements; and 6, verifying the time constants and the coefficients of the inertial elements. By adoption of the method provided by the invention, the defects of the prior art are overcome; the number, the time constants and the coefficients of the inertial elements are determined according to the volume average temperature which is obtained by off-line finite element calculation; the calculation accuracy of the volume average temperature of the rotor, the surface temperature difference of the rotor and heat stress is improved; and technical guarantee is provided for the heat stress optimal control of the turbine rotor and the safety of varying load operation of the turbine.
Description
technical field [0001] The invention relates to a method for determining the inertia link coefficient calculated by the volume average temperature of a steam turbine rotor, 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 surface of the rotor changes drastically, while the temperature inside the rotor changes relatively slowly, and the temperature difference between the outer surface of the rotor and the average temperature of the rotor volume is relatively large. The greater the temperature difference between the outer surface of the rotor and the average temperature of the rotor volume, the greater the thermal stress on the outer surface and the greater the life loss of the rotor. Thermal stress on the outer surface can be monitored by monitoring the temperature difference between the outer surface of the rotor and the rotor volume average temperature. Due...
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IPC IPC(8): G06F17/50
Inventor 杨宇史进渊邓志成汪勇
Owner SHANGHAI POWER EQUIP RES INST