Method for measuring leakage amount of bridge crossing steam seal of reheating type composite cylinder turbine
A technology of steam seal leakage and steam turbine, which is applied in the field of testing, can solve problems such as the inability to calculate the flow rate of the steam seal across the bridge, the inability to completely close the cooling steam, and the inability of the medium pressure cylinder to truly reflect the actual efficiency of the medium pressure cylinder, etc.
Active Publication Date: 2015-04-22
DONGFANG TURBINE CO LTD
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[0009] 3) For supercritical and ultra-supercritical combined-cylinder steam turbines, due to the existence of: first-pump or high-pressure certain stage cooling steam to the medium-pressure impeller, in order to ensure the life of the steam turbine rotor, the manufacturer has a limit value for the impeller temperature, so that the cooling steam cannot It is completely closed, so the variable steam temperature method can no longer calculate the flow of the bridge seal
[0011] Based on the above two reasons, the efficiency of the medium pressure cylinder obtained in the current test cannot truly reflect the actual efficiency of the medium pressure cylinder
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[0033] see figure 2 , the method for measuring the leakage of the bridge seal of the reheating combined cylinder steam turbine is to use the original leakage channel in the accident discharge system of the bridge seal of the high and medium pressure cylinder, and add temperature measuring points, pressure measuring points, flow meters, and regulating valves. And the stop valve, by adjusting the opening of the regulating valve, the pressure of the emergency steam release system is adjusted, and part or all of the leaked steam of the bridge seal is discharged to the condenser, and the bridge seal under the operating state is accurately obtained through the Martin formula. Leakage steam flow, so as to correctly reflect the actual cylinder efficiency and real heat consumption of the medium pressure cylinder, to ensure the authenticity of the performance assessment test results. The specific structure of the discharge passage includes: a discharge pipeline 1 and a pressure sensor ...
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The invention discloses a method for measuring leakage amount of a bridge crossing steam seal of a reheating type composite cylinder turbine. An accident steam discharging system discharging channel connected to the middle segment of the bridge crossing steam seal at the position of a high-intermediate pressure inner cylinder of the turbine is utilized, a temperature measuring point, a pressure measuring point and a flowmeter are additionally arranged, a steam discharging valve is opened to measure steam parameters, and the steam leakage amount of the bridge crossing steam seal is accurately obtained through the Martin formula, so that the authenticity of the performance examination test result is ensured, and the actual cylinder efficiency and heat consumption of an intermediate pressure cylinder are correctly reflected.
Description
technical field [0001] The invention relates to a performance test technology of a steam turbine, in particular to a measuring method for determining the leakage steam flow rate of a bridge seal of a reheating combined-cylinder steam turbine, and belongs to the technical field of testing. Background technique [0002] An important content of the steam turbine performance assessment test is to determine the leakage steam flow rate of the bridge seal, which has a great influence on the real efficiency of the intermediate pressure cylinder and the calculation of the heat rate of the steam turbine. [0003] A large part of the reheating thermal power steam turbine is a high-middle pressure cylinder structure, such as figure 1 shown. This arrangement is commonly referred to as a "symmetric flow" design. The main steam enters the high-pressure stage from the main steam pipe near the center of the cylinder to do work, and then the exhaust steam flows into the reheater. The rehea...
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Inventor 陈显辉井芳波卫栋梁王松谭锐方宇李曦滨孙永平
Owner DONGFANG TURBINE CO LTD