Online detecting method and device for air leakage quantity of vacuum system of turbo generator unit

A technology for turbogenerator sets and vacuum systems, applied in measuring devices, using liquid/vacuum degree for liquid tightness measurement, measuring capacity, etc., can solve the problems of unfavorable unit safety, increase air solubility, vacuum drop, etc., and achieve measurement Simple mechanism, clear measurement principle and convenient installation

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A technology for turbogenerator sets and vacuum systems, applied in measuring devices, using liquid/vacuum degree for liquid tightness measurement, measuring capacity, etc., can solve the problems of unfavorable unit safety, increase air solubility, vacuum drop, etc., and achieve measurement Simple mechanism, clear measurement principle and convenient installation

CN102252808AInactive Publication Date: 2011-11-23SHANDONG ELECTRIC POWER RES INST +1

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[0067] Parameters obtained by online measurement: temperature t 2 : 35°C, pressure p 2 : 106kpa, relative humidity: 50%, gas velocity: 1.5m / s, the pipe diameter of the exhaust pipe is 0.05m, and the cross-sectional area S=3.14×0.05 2 =0.0079m 2 ,

[0068] From formula (6) get V 空气 =V 湿空气 =v×S=1.5m / s×0.0079m 2 =0.0119m 3 / s,

[0069] From the saturated steam chart, the saturated steam pressure p at 35°C s It is: 5.626kpa. Substitute the above measured and calculated parameters into formula (5):

[0070] G 空气 =29×(106kpa-50%×5.626kpa)×0.0119m 3 / s÷[8.314J / (mol·K)×(35+273.15)]=0.0139kg / s=0.0139×3600kg / h=50.0378kg / h

[0071] figure 2 Shown is an on-line detection device for air leakage of a vacuum system of a turbogenerator set provided by the present invention, which is connected to a water ring vacuum pump 4 on the air pumping pipeline of the condenser 2, and the pipeline behind the water ring vacuum pump is sequentially A temperature sensor 5, a pressure sensor 6,...

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Abstract

The invention relates to an online detecting method and device for air leakage quantity of a vacuum system of a turbo generator unit. The device and method can be used for measuring the amount of the air leaked from a condenser which is vacuumized by using a water-ring vacuum pump, on line. The method comprises the following specific steps of: additionally arranging a temperature sensor, a pressure sensor, a gas flow rate sensor and an absolute humidity sensor behind the water-ring vacuum pump, determining the mass flow of the water vapor in a pump-out pipeline in certain particular working condition through parameters measured by the sensors, and calculating to obtain the mass flow of the pumped-out air by using a thermodynamic formula, wherein the mass flow of the pumped-out air is the sum of air leak-in rates of all negative pressure parts of the whole vacuum system. The invention has the advantages of clear and accurate measuring principle, simple measuring mechanism, convenience for installation and capabilities of measuring air leakage amount of the condenser on line and providing a reliable parameter basis for the vacuum system of the turbo generator unit to maintain a higher vacuum level and a guarantee for the safe and economic production of a power plant.

Description

technical field [0001] The invention relates to an on-line detection method and device for the air leakage of the vacuum system of a steam turbine generator set in a power plant. Background technique [0002] The vacuum system of the turbogenerator unit includes: the steam side of the condenser, the air extraction system and other negative pressure parts. Its function is to enable the steam to convert the enthalpy into the kinetic energy of the steam turbine to the maximum extent, and finally convert it into electrical energy. The vacuum of the condenser has a great influence on the economic benefits of the unit. Every 1kPa increase in the vacuum value of the condenser will reduce the coal consumption of power supply by about 3g / kW·h. Therefore, maintaining a high vacuum of the turbo-generator unit can significantly improve the economy of the power plant. [0003] In addition, from the perspective of safe production, it is also essential to maintain the vacuum of the turboge...

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Application Information

Patent Timeline

23 Nov 2011

Publication

CN102252808A

IPC: G01M3/26; G01F15/07

Inventors: 王学同; 郭盈