Correction method for optimization of sliding pressure of large steam turbine

A steam turbine, large-scale technology, applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of unit sliding pressure operation efficiency, opening deviation from the optimal sliding pressure valve position, main steam flow increase, etc., to achieve good The effect of energy-saving operation, saving coal cost, and high operating efficiency

Active Publication Date: 2010-10-20
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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Problems solved by technology

However, during the daily operation of the steam turbine, the change of the condenser pressure due to seasonal changes or the increase of the main steam flow due to the unit’s external extraction of steam for heating, etc., often cause th

Method used

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  • Correction method for optimization of sliding pressure of large steam turbine
  • Correction method for optimization of sliding pressure of large steam turbine

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Experimental program
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Effect test

Embodiment 1

[0035] Application of Embodiment 1 Condenser Pressure Correction Factor

[0036] Introducing the "condenser pressure correction factor" in the unit sliding pressure optimization control is equivalent to changing the original fixed and unchanging sliding pressure control curve into a cluster of sliding pressure control that can be automatically adjusted according to the change of condenser pressure at any time curve. Correspondingly, the load at the constant and sliding pressure switching points of the unit is also in a state of constant adjustment, so as to ensure that the high pressure control valve of the steam turbine is in the "best sliding pressure valve position" state. The application method and effect of "condenser pressure correction factor" will be explained below by taking the case where the constant pressure and sliding pressure transition points of a supercritical 600MW unit change with the condenser vacuum as an example.

[0037] Through the sliding pressure opt...

Embodiment 2

[0043] Application of Example 2 Heating Flow Correction Factor

[0044] Such as figure 2 As shown, the thin solid line in the figure is the main steam pressure change curve of the sliding pressure operation with two valves fully open under the condition of no heating. The fitting formula of the sliding pressure curve is: Y=0.11927X+0.755, where Y is the main Steam pressure, unit MPa, X is the unit load, unit MW; the dotted line represents the main steam pressure change curve of the unit in the state of external heating of 16t / h with two valves fully open sliding pressure operation, and the corresponding two valve sliding pressure main steam pressure The fitting formula is: Y=0.12003X+1.120. After comparing the two curves in the figure, it can be seen that when the same unit is connected to the electric load, the set value of the main steam pressure of the unit in the heating state is higher than that in the non-heating state, and the average higher range is about 4%. , from...

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Abstract

The invention discloses a correction method for optimization of sliding pressure of a large steam turbine generator set of a power plant. The current research on optimization of the sliding pressure of the large steam turbine generator set operating under the low load to ensure that the generator set can operate with excellent performance under the sliding pressure during the low-load operation has great significance in improvement of the operating efficiency of the generator set. The correction method is characterized in that correction factors are adopted to correct the sliding pressure control curve of the generator set, that is, the relevance relation of the load of the generator set, the main steam pressure and the opening of the high-pressure regulating valve is expressed as Cn*Ng varies as Cp*P0*Cv. Since the specific correction factors are introduced for control elements, the load of the generator set and the main steam pressure of the control curve of the generator set under the sliding pressure in the sliding pressure deviation factor correction method, the invention ensures that the steam turbine generator is in the mode of operating under the best sliding pressure, andcan maintain the high operating efficiency of the generator set all the time.

Description

technical field [0001] The invention relates to a correction method for optimizing sliding pressure of a large steam turbine generator set in a thermal power plant. Background technique [0002] Due to the continuous development of the social economy, the society's demand for resources has grown rapidly, and the supply of electricity and coal has also become tense. The continuous rise in coal prices has directly caused the increase in power generation costs, and the linkage mechanism of electricity prices has lagged behind due to the influence of the country's overall economic environment. All these have brought huge operating pressure to power generation companies, and corporate profits have dropped sharply or even suffered losses. What power generation companies can do is to reduce unit energy consumption and minimize power generation costs. Therefore, energy saving and consumption reduction in the operation of thermal power units has become an objective need for the surv...

Claims

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Application Information

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IPC IPC(8): F01D17/00
Inventor 孙永平童小忠朱松强
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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