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A Calculation Method of Critical Air Leakage Amount Caused by Condenser Vacuum Deterioration

A technology of air leakage and vacuum deterioration, applied in the calculation of critical air leakage

Active Publication Date: 2017-12-29
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the above problems, and to provide a calculation method for the critical leakage air volume that causes the vacuum deterioration of the condenser. Under the condition that the load and the volume output of the air extractor are constant, the method establishes a Steady-state heat transfer model to calculate the change of condenser vacuum when the leakage air volume changes, so as to determine the critical air leakage volume that causes the condenser vacuum to deteriorate

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  • A Calculation Method of Critical Air Leakage Amount Caused by Condenser Vacuum Deterioration
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  • A Calculation Method of Critical Air Leakage Amount Caused by Condenser Vacuum Deterioration

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[0054] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0055] A method for calculating the critical leakage air volume that causes the vacuum deterioration of the condenser, comprising the following steps:

[0056] 1) Cooling water flow D w , cooling water inlet temperature t 1 , air extractor output V H , the steam flow rate G discharged into the condenser s is the measured value, assuming that at any given leakage air volume G a , set the saturated steam temperature t corresponding to the condenser pressure s0 is the initial iteration parameter, and the initial temperature difference of the condenser is obtained by subtracting the cooling water inlet temperature from the steam side temperature.

[0057] 2) According to formula (2-21), a s First take the heat release coefficient of pure steam as 17500 to calculate the initial heat transfer coefficient K, and then calculate the cooling water temperature ris...

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Abstract

The invention discloses a method for calculating the critical air leakage volume that causes the vacuum deterioration of the condenser, comprising: setting initial iteration parameters; performing iterative calculation for each cooling pipe, and drawing the vacuum of the condenser and the air leakage volume The relational curve, in which the air leakage volume corresponding to the inflection point of the curve is the critical air leakage volume that causes the vacuum deterioration of the condenser. Beneficial effects of the present invention: under the condition that the load and the volume output of the air extractor are constant, by establishing a one-dimensional steady-state heat transfer model of the condenser, the change of the vacuum of the condenser when the air leakage volume changes is calculated, so as to determine the The critical air leakage of condenser vacuum deterioration provides guidance for the safe and economical operation of condensers in power plants.

Description

technical field [0001] The invention relates to a calculation method of the critical leakage air volume which causes the vacuum deterioration of the condenser. Background technique [0002] Condenser is an important auxiliary machine of thermal power unit and plays a pivotal role in the thermodynamic cycle of the power plant. The deterioration of its operating condition will directly cause the exhaust pressure of the steam turbine to increase, the heat consumption and steam consumption of the unit will increase, and the output will drop, which will endanger the safety of the unit. , Economical operation, so the normal operation of the condenser has a decisive impact on the safe and economical operation of the thermal power plant. [0003] The heat transfer process of the condenser is quite special, and the working fluid on the shell side is accompanied by a phase change during the flow heat transfer process. And because the shell side of the condenser is in a vacuum state, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 祝令凯郑威丁俊齐李福尚
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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