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Method for detecting exhaust enthalpy of turbine

A detection method and technology of exhaust steam enthalpy, which can be used in measurement devices, heat measurement, instruments, etc., can solve the problems of large measurement error, no temperature measurement points, and insufficient accuracy of system heat balance calculation results.

Inactive Publication Date: 2012-10-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The last two low-pressure heaters in the recuperation system of large steam turbines are usually located in the condenser, and the condensate pipes between them usually have no temperature measuring points; the diameter of the circulating water pipe of the actual unit is relatively large, and a section long enough is required to measure its parameters The straight pipe section, but the site often cannot meet this requirement, and the measurement error is large
These make the system heat balance calculation results not accurate enough

Method used

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  • Method for detecting exhaust enthalpy of turbine
  • Method for detecting exhaust enthalpy of turbine
  • Method for detecting exhaust enthalpy of turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: According to four different working conditions, the exhaust steam enthalpy value of a 300MW steam turbine of SAIC was detected under any working condition.

[0049] 1) In four different power operating conditions: rated working condition (THA working condition), 75% rated working condition (75% THA working condition), 60% rated working condition (60% THA working condition) and 50% rated working condition The ideal enthalpy drop △h of the low-pressure cylinder of the steam turbine is measured and calculated under the working condition (50%THA working condition) t And the percentage b of the sum of nozzle loss, rotor blade loss, blade height loss, sector loss, impeller friction loss, and leakage loss of the low-pressure cylinder accounted for the ideal enthalpy drop of the low-pressure cylinder b, to obtain the △h under each working condition t and b, the estimated △h t The methods for value and b-value are as follows:

[0050] 11) Use the temperature and pre...

Embodiment 2

[0078] Example 2: According to five different working conditions, the exhaust steam enthalpy value of a certain 300MW steam turbine of SAIC was detected under any working condition.

[0079] 1) In five different power operating conditions: rated working condition (THA working condition), maximum continuous output (TMCR working condition), 75% rated working condition (75% THA working condition), 60% rated working condition (60 %THA working condition) and 50% rated working condition (50%THA working condition), the ideal enthalpy drop △h of the low-pressure cylinder of the steam turbine is calculated t And the percentage b of the sum of nozzle loss, rotor blade loss, blade height loss, sector loss, impeller friction loss, and leakage loss of the low-pressure cylinder accounted for the ideal enthalpy drop of the low-pressure cylinder b, to obtain the △h under each working condition t and b, the estimated △h t The methods for value and b-value are as follows:

[0080] 11) Use the...

Embodiment 3

[0103] Example 3: According to six different working conditions, the exhaust steam enthalpy value of a certain 300MW steam turbine of SAIC was detected under any working condition.

[0104] 1) In six different power operating conditions: rated working condition (THA working condition), maximum continuous output (TMCR working condition), summer working condition (TRL working condition), 75% rated working condition (75%THA working condition ), 60% rated working condition (60%THA working condition) and 50% rated working condition (50%THA working condition), the ideal enthalpy drop △h of the low-pressure cylinder of the steam turbine is calculated t And the percentage b of the sum of nozzle loss, rotor blade loss, blade height loss, sector loss, impeller friction loss, and leakage loss of the low-pressure cylinder accounted for the ideal enthalpy drop of the low-pressure cylinder b, to obtain the △h under each working condition t and b, the estimated △h t The methods for value an...

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Abstract

The invention discloses a method for detecting exhaust enthalpy of a turbine. The method includes the following steps of measuring and calculating a change rule of a specific parameter when a working condition changes according to designed data or test measured data, calculating to obtain a numerical value of the specific parameter under one certain working condition, acquiring partial heating power data of a low pressure cylinder under the certain working condition by the aid of a measuring instrument, reasonably assuming on the basis of a stage loss theory to obtain a numerical model for calculating the exhaust enthalpy of the turbine, substituting the numerical value of the specific parameter and the partial heating power data into the numerical model for calculating the exhaust enthalpy of the turbine to calculate the value of exhaust enthalpy of the turbine under the certain working condition. On the basis of stage loss theory, stage losses of the turbine are sorted into exhaust steam loss relating to volume flow, moisture loss relating to moisture and other losses relating to ideal enthalpy drop, and the calculation is simple, clear and highly precise. Detailed structural parameter of the low pressure cylinder is not needed, so measure points are reduced, and influence on calculated result caused by measuring error is small.

Description

technical field [0001] The invention relates to the field of steam turbine thermodynamic system analysis, in particular to the technology for measuring and calculating the steam exhaust enthalpy of the steam turbine. Background technique [0002] As the key equipment in conventional thermal power plants, the steam turbine's thermal performance not only affects the economic benefits of power generation enterprises, but also directly affects the energy consumption and environmental conditions of the whole society. Therefore, thermal power generation enterprises need to conduct regular thermal performance tests of steam turbine units, or use advanced detection technology and computer technology to monitor the thermal performance of the unit online, to understand and master the performance status of the main equipment or components of the steam turbine unit, and to evaluate the thermal performance of the unit , Economic and security indicators. [0003] The thermal economic ind...

Claims

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Application Information

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IPC IPC(8): G01K17/06
Inventor 胥建群张赟杨涛周克毅石永锋
Owner SOUTHEAST UNIV
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