CN110470689B - Estimation method for equivalent life loss of heat-resistant steel at different temperatures based on Lame-meter parameter method - Google Patents
Estimation method for equivalent life loss of heat-resistant steel at different temperatures based on Lame-meter parameter method Download PDFInfo
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Abstract
The invention discloses a method for estimating equivalent life loss of heat-resistant steel at different temperatures based on a Lam-meter parameter method, which comprises the following steps: acquiring the over-temperature condition of the high-temperature pressure-bearing member through a power plant operation monitoring system; deducing a Rama parameter method formula to obtain equivalent life loss coefficients at different over-temperature temperatures; and calculating the running time at different temperatures relative to the running time at the normal running temperature through the equivalent life loss coefficient, and simplifying the calculation into the life loss calculation of running for a certain time at the normal temperature.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for estimating equivalent life loss of heat-resistant steel at different temperatures based on a Lam-meter parameter method.
Background
The high-temperature pressure-bearing member of the thermal power plant is required to operate at a design temperature under a normal working condition, but due to the change of a combustion working condition of a boiler or the abnormal flow of steam and water in the pressure-bearing member, the whole or part of the high-temperature pressure-bearing member often has an over-temperature condition. When the service life of the high-temperature pressure-bearing member heat-resistant steel is evaluated, the service life losses at different temperatures need to be calculated respectively and then summarized, and if the overtemperature condition is complex, the overtemperature temperature is different, and the time is different, the calculation of the service life losses respectively is very complicated.
Disclosure of Invention
The invention aims to quickly and effectively calculate the total life loss of a high-temperature pressure-bearing component of a power plant at different temperatures, and provides a method for estimating equivalent life loss of heat-resistant steel at different temperatures based on a Lam-meter parameter method, which can greatly simplify the calculation process of the total life loss of the high-temperature pressure-bearing component material of the power plant under the complex and over-temperature condition and improve the life evaluation efficiency.
The invention is realized by adopting the following technical scheme:
the method for estimating the equivalent life loss of the heat-resistant steel at different temperatures based on the Lame-meter parameter method comprises the following steps:
step 1, setting the normal operation temperature of the high-temperature pressure-bearing member of the power plant to be T1Starting from a certain time to run at an over-temperature of T2Over-temperature time of t2(ii) a FalseSetting the internal pressure stress sigma applied to the whole operation time part to be unchanged; let t1T is heat-resistant steel for high-temperature pressure-bearing member2Run down t2Equivalent to at T1The running time of the process; calculating T2Relative T at temperature1Equivalent life loss ratio of temperature A, where A ═ t2/t1；
And 2, after obtaining the equivalent life loss rate A, calculating the running time at different temperatures relative to the running time at normal running temperature, and simplifying the calculation into the life loss calculation of running at normal temperature for a preset time.
The further improvement of the invention is that the step 1 specifically comprises the following implementation steps:
1) normal operating temperature T1Over-temperature operating temperature T2Time over temperature t2The data acquisition is completed through a power plant operation data monitoring and acquisition system;
2) the Lame-meter parameter method defines the T under the condition that the stress sigma of the same heat-resistant steel is not changed1(C+lgt1)＝T2(C+lgt2) Wherein T is the open temperature, C is the material constant, and T is the operating time;
3) lgt obtained by the formula in the step 2)2＝[(T1-T2)C+T1lgt1]/T2＝(T1/T2)lgt1+(T1-T2)C/T2；
4) T can be obtained from the formula in step 3)2＝10[(T1/T2)lgt1+(T1-T2)C/T2]；
5) T can be obtained from the formula in step 4)2＝10(T1-T2)C/T2×10(T1/T2)lgt1＝10(T1-T2)C/T2×t1 T1/T2；
6) T can be obtained by the formula in the step 5)2Relative T at temperature1Equivalent life loss rate at temperature, a ═ t2/t1＝10(T1 -T2)C/T2×t1 (T1-T2)/T2；
7) According to the formula in step 6), 1 < t1 (T1-T2)/T2T < 10, so t can be adjusted1 (T1-T2)/T2If 10 is taken, then A equals t2/t1＝10(T1-T2)C/T2×10＝10[(T1-T2)C+T2]/T2。
The invention has the following beneficial technical effects:
the Lame-meter parameter method is a common method for evaluating the service life of heat-resistant steel. It expresses the temperature and time of the heat-resistant steel as a function of the stress, P (σ) ═ T (C + lgt), by assumption and simplification. The equivalent life loss rate of the heat-resistant steel at different temperatures and different times can be obtained by deducing a Rama parameter method formula, so that the life loss at different temperatures and different times can be simplified into the life loss at the same temperature and within a certain time, and the calculation workload of the life loss is greatly simplified.
According to the estimation method of the equivalent life loss of the heat-resistant steel at different temperatures based on the Lam-M parameter method, the equivalent life loss rate of the heat-resistant steel at different temperatures is obtained by deducing the Lam-M parameter method formula, so that the life loss at different temperatures and different times can be simplified into the life loss at the same temperature and a certain time, the calculation workload of the life loss is greatly reduced, the calculation process of the total life loss amount of the high-temperature pressure-bearing component material of the power plant under the complex and over-temperature condition is simplified, and the life estimation efficiency is improved.
Detailed Description
The present invention is further described below.
The invention provides a method for estimating equivalent life loss of heat-resistant steel at different temperatures based on a Lam-meter parameter method, which comprises the following steps:
step 1, setting the normal operation temperature of the high-temperature pressure-bearing member of the power plant to be T1Starting from a certain time to run at an over-temperature of T2Over-temperature time of t2. It is assumed that the internal pressure stress σ to which the component is subjected is constant throughout the operating time. Let t1T is heat-resistant steel for high-temperature pressure-bearing member2Run down t2Equivalent to at T1The running time of (c). Calculating T by an estimation method of equivalent life loss of the heat-resistant steel at different temperatures based on a Lame-meter parameter method2Relative T at temperature1Equivalent life loss ratio of temperature A (t)2/t1) The method specifically comprises the following implementation steps:
1) normal operating temperature T1Over-temperature operating temperature T2Time over temperature t2And data acquisition is completed through a power plant operation data monitoring and acquisition system.
2) The Lame-meter parameter method defines the T under the condition that the stress sigma of the same heat-resistant steel is not changed1(C+lgt1)＝T2(C+lgt2) Wherein T is the open temperature, C is the material constant, and T is the operating time;
3) lgt obtained by the formula in the step 2)2＝[(T1-T2)C+T1lgt1]/T2＝(T1/T2)lgt1+(T1-T2)C/T2；
4) T can be obtained from the formula in step 3)2＝10[(T1/T2)lgt1+(T1-T2)C/T2]；
5) T can be obtained from the formula in step 4)2＝10(T1-T2)C/T2×10(T1/T2)lgt1＝10(T1-T2)C/T2×t1 T1/T2；
6) T can be obtained by the formula in the step 5)2Relative T at temperature1Equivalent life loss rate at temperature, a ═ t2/t1＝10(T1 -T2)C/T2×t1 (T1-T2)/T2；
7) According to the formula in step 6), characterized in that 1 < t1 (T1-T2)/T2T < 10, so t can be adjusted1 (T1-T2)/T2If 10 is taken, then A equals t2/t1＝10(T1-T2)C/T2×10＝10[(T1-T2)C+T2]/T2。
And 2, after obtaining the equivalent life loss rate A, calculating the operation time at different temperatures relative to the operation time at the normal operation temperature, and simplifying the operation time at different temperatures into the life loss calculation of the operation time at the normal temperature for a certain time.
Claims (1)
1. The method for estimating the equivalent life loss of the heat-resistant steel at different temperatures based on the Lame-meter parameter method is characterized by comprising the following steps of:
step 1, setting the normal operation temperature of the high-temperature pressure-bearing member of the power plant to be T1Starting from a certain time to run at an over-temperature of T2Over-temperature time of t2(ii) a Assuming that the internal pressure stress σ to which the component is subjected is constant throughout the operating time; let t1T is heat-resistant steel for high-temperature pressure-bearing member2Run down t2Equivalent to at T1The running time of the process; calculating T2Relative T at temperature1Equivalent life loss ratio of temperature A, where A ═ t2/t1(ii) a The method specifically comprises the following implementation steps:
1) normal operating temperature T1Over-temperature operating temperature T2Time over temperature t2The data acquisition is completed through a power plant operation data monitoring and acquisition system;
2) the Lame-meter parameter method defines the T under the condition that the stress sigma of the same heat-resistant steel is not changed1(C+lgt1)＝T2(C+lgt2) Wherein T is the open temperature, C is the material constant, and T is the operating time;
3) lgt obtained by the formula in the step 2)2＝[(T1-T2)C+T1lgt1]/T2＝(T1/T2)lgt1+(T1-T2)C/T2；
4) T can be obtained from the formula in step 3)2＝10[(T1/T2)lgt1+(T1-T2)C/T2]；
5) T can be obtained from the formula in step 4)2＝10(T1-T2)C/T2×10(T1/T2)lgt1＝10(T1-T2)C/T2×t1 T1/T2；
6) T can be obtained by the formula in the step 5)2Relative T at temperature1Equivalent life loss rate at temperature, a ═ t2/t1＝10(T1-T2)C/T2×t1 (T1-T2)/T2；
7) According to the formula in step 6), 1 < t1 (T1-T2)/T2T < 10, so t can be adjusted1 (T1-T2)/T2If 10 is taken, then A equals t2/t1＝10(T1 -T2)C/T2×10＝10[(T1-T2)C+T2]/T2；
And 2, after obtaining the equivalent life loss rate A, calculating the running time at different temperatures relative to the running time at normal running temperature, and simplifying the calculation into the life loss calculation of running at normal temperature for a preset time.
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