CN109084829B - Method for verifying and calibrating oxidation rate of high-temperature heating surface of supercritical thermal generator set - Google Patents
Method for verifying and calibrating oxidation rate of high-temperature heating surface of supercritical thermal generator set Download PDFInfo
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- CN109084829B CN109084829B CN201810636221.6A CN201810636221A CN109084829B CN 109084829 B CN109084829 B CN 109084829B CN 201810636221 A CN201810636221 A CN 201810636221A CN 109084829 B CN109084829 B CN 109084829B
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Abstract
A verification and calibration method for the oxidation rate of a high-temperature heating surface of a supercritical thermal generator set is disclosed, and the verification method comprises the following steps: a. the run-time validation and calibration is: whether the oxidation rate is abnormal or not is synchronous with the wall temperature overtemperature during the operation, and the wall temperature is qualified after the operation adjustment; corresponding to whether the oxidation rate is normal or not; b. the field inspection verification and calibration during the overhaul period are as follows: the scale peeling and pipe blocking conditions are checked through means such as magnetic inspection, endoscopy and the like, and whether the oxidation rate monitoring result is consistent or not is verified; c. the detection, verification and calibration of the oxide skin during the overhaul period are as follows: by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallographic microscope analysis on an oxide scale sample and a pipe plugging sample, verifying the forming, growing and stripping mechanisms and rules of the oxide scale and providing oxide scale control measures; d. and (c) verifying and calibrating the oxidation rate monitoring model in the steps a, b and c, and finally realizing the improvement of scale treatment measures.
Description
Technical Field
The invention relates to a verification and calibration method for the oxidation rate of a high-temperature heating surface of a supercritical thermal generator set, and belongs to the technical field of treatment of high-temperature oxide skin of the supercritical thermal generator set.
Background
In recent years, the problem of oxide skin of a superheater material of a supercritical unit is prominent, and due to the rapid and large generation of the oxide skin of the superheater material and a reheater material, when the load of the unit is fluctuated violently, the oxide skin is easy to be largely peeled off, so that pipe blockage, overtemperature and pipe explosion are caused, and the problem becomes a great potential safety hazard influencing the safe operation of the unit. The high-temperature oxidation rate of the unit is always lack of means capable of monitoring on line, data show that many research works are carried out on the oxidation rule of high-temperature water vapor on superheater materials at home and abroad, but the research works are in theoretical research carried out in laboratories, the oxide scale generation rate is lack of monitoring means and data accumulation, the growth principle and influencing factors of the oxide scale are lack of experimental argumentation, prediction and judgment can not be carried out on a high-temperature oxide scale risk area of a high-temperature heating surface during the operation of the unit, therefore, targeted inspection can not be arranged during planned maintenance of the unit, real preventive maintenance work can not be carried out, a large amount of scale stripping phenomena of the oxide scale occur again in the starting period even after maintenance, the excessive temperature load reduction is caused slightly, and shutdown is caused seriously.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for verifying and calibrating the oxidation rate of a high-temperature heating surface, which can verify the forming, growing and stripping mechanism and rule of a high-temperature oxide skin, provide an oxide skin control measure and eliminate the problems of oxide skin growing, stripping and pipe blockage.
The invention aims to complete the verification and calibration method of the oxidation rate of the high-temperature heating surface of the supercritical thermal generator set by the following technical scheme, wherein the verification method comprises the following steps: the method comprises the following steps of verification and calibration during high-temperature oxide skin operation, field inspection verification and calibration during overhaul, and oxide skin detection verification and calibration during overhaul, wherein the method comprises the following specific steps:
a. the run-time validation and calibration is: during the operation, whether the oxidation rate is abnormal or not is synchronous with the wall temperature overtemperature, and the wall temperature is qualified after operation adjustment; if the corresponding oxidation rates are not normal, further calibrating the oxidation rate monitoring model, and gradually progressing;
b. the field inspection verification and calibration during the overhaul period are as follows: during maintenance, scale peeling and pipe blockage conditions are checked through means of magnetic inspection, endoscopy and the like, whether the oxidation rate monitoring results are consistent or not is verified, and if the oxidation rate monitoring results are not consistent, the oxidation rate monitoring model is further calibrated, and the steps are carried out;
c. the detection, verification and calibration of the oxide skin during the overhaul period are as follows: by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallography microscope analysis on an oxide skin sample and a pipe plugging sample, verifying the forming, growing and stripping mechanisms and rules of the oxide skin, providing oxide skin control measures, eliminating the problems of oxide skin growth, stripping and pipe plugging, and ensuring the safe operation of a unit; on the contrary, if the problems of scale growth, peeling and pipe blockage exist, the oxidation rate monitoring model is further verified and calibrated step by step;
d. and (c) verifying and calibrating the oxidation rate monitoring model in the steps a, b and c, and finally realizing the perfection of scale control measures and promoting the safe operation of the boiler.
Preferably, the method comprises the following steps: in the step a, the verification and calibration during the operation period is to verify that the oxidation rate is abnormal through wall temperature overtemperature, verify that the wall temperature is overtemperature through the oxidation rate is abnormal, verify that the oxidation rate is normal through the wall temperature is qualified, and verify that the wall temperature is qualified through the oxidation rate is normal; when the wall temperature is qualified and the oxidation rate is abnormal, calibrating the oxidation rate monitoring model, and when the wall temperature is over-temperature and the oxidation rate is normal, calibrating the oxidation rate monitoring model and gradually progressing.
Preferably, the method comprises the following steps: in the step b), the on-site examination verification and calibration during the overhaul period are to carry out the magnetic examination and the endoscopy on the typical part of the high-temperature heating surface of the boiler, verify that the oxidation rate is abnormal according to the examination result, and calibrate the oxidation rate monitoring model if the oxidation rate is not consistent; and verifying that the oxidation rate is normal according to the check result, and calibrating the oxidation rate monitoring model if the oxidation rate is not in accordance with the check result, and carrying out progressive operation.
Preferably, the method comprises the following steps: in the step c), the detection, verification and calibration of the oxide skin during the overhaul period are carried out by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallographic microscope analysis on an oxide skin sample and a pipe blockage sample, verifying the forming, growing and stripping mechanism and rule of the oxide skin, providing the oxide skin control measure, eliminating the problems of oxide skin growth, stripping and pipe blockage, and verifying the safe operation of the boiler; otherwise, if the problems of scale growth, peeling and pipe blockage exist, verifying that the oxidation rate is abnormal, and otherwise, calibrating the oxidation rate monitoring model and progressing.
The invention calibrates the high-temperature heating surface oxidation rate monitoring model and the growth and stripping rules of the high-temperature oxide skin through verification and calibration during the operation period, on-site inspection verification and calibration during the overhaul period and oxide skin detection verification and calibration during the overhaul period, and is circularly developed and continuously perfected. Further provides a scale control measure to eliminate the problems of scale growth, scale stripping and pipe blockage.
When the hydrogen gas production rate of the real-time monitoring value is compared with the empirical value of the data model and has deviation, or the actually measured temperature point and the empirical value synchronously have deviation, counting the frequency of the deviation of the points, and predicting and early warning a high-temperature oxidation risk area according to the statistical result; in different stages after the unit is put into operation, the risk area is scanned, counted and judged regularly or in real time, the high risk area is counted and analyzed regularly, the key risk area of high-temperature oxide skin peeling is predicted and judged according to the statistical analysis result, key inspection and preventive maintenance are arranged on the high risk area when the unit is planned to be maintained, and the low risk area is subjected to spot inspection synchronously to check and judge the accuracy of prediction.
Drawings
FIG. 1 is a flow chart of the verification and calibration of the oxidation rate of the high temperature heated surface according to the present invention.
Detailed Description
The invention will be described in detail below with reference to the following figures: as shown in fig. 1, the verification method for the oxidation rate of the high-temperature heating surface of the supercritical thermal generator set according to the present invention includes: the method comprises the following steps of verification and calibration during high-temperature oxide skin operation, field inspection verification and calibration during overhaul, and oxide skin detection verification and calibration during overhaul, wherein the method comprises the following specific steps:
a. the run-time validation and calibration is: during the operation, whether the oxidation rate is abnormal or not is synchronous with the wall temperature overtemperature, and the wall temperature is qualified after operation adjustment; if the corresponding oxidation rates are not normal, further calibrating the oxidation rate monitoring model, and gradually progressing;
b. the field inspection verification and calibration during the overhaul period are as follows: during maintenance, scale peeling and pipe blockage conditions are checked through means of magnetic inspection, endoscopy and the like, whether the oxidation rate monitoring results are consistent or not is verified, and if the oxidation rate monitoring results are not consistent, the oxidation rate monitoring model is further calibrated, and the steps are carried out;
c. the detection, verification and calibration of the oxide skin during the overhaul period are as follows: by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallography microscope analysis on an oxide skin sample and a pipe plugging sample, verifying the forming, growing and stripping mechanisms and rules of the oxide skin, providing oxide skin control measures, eliminating the problems of oxide skin growth, stripping and pipe plugging, and ensuring the safe operation of a unit; on the contrary, if the problems of scale growth, peeling and pipe blockage exist, the oxidation rate monitoring model is further verified and calibrated step by step;
d. and (c) verifying and calibrating the oxidation rate monitoring model in the steps a, b and c, and finally realizing the perfection of scale control measures and promoting the safe operation of the boiler.
In the step a of the invention, the verification and calibration during the operation period is to verify that the oxidation rate is abnormal through wall temperature overtemperature verification, verify that the wall temperature is overtemperature through the oxidation rate abnormality, verify that the oxidation rate is normal through the wall temperature qualification verification, and verify that the wall temperature is qualified through the oxidation rate normality; when the wall temperature is qualified and the oxidation rate is abnormal, calibrating the oxidation rate monitoring model, and when the wall temperature is over-temperature and the oxidation rate is normal, calibrating the oxidation rate monitoring model and gradually progressing.
In the step b), the on-site examination verification and calibration during the overhaul period are to carry out the magnetic examination and the endoscopy on the typical part of the high-temperature heating surface of the boiler, verify that the oxidation rate is abnormal according to the examination result, and calibrate the oxidation rate monitoring model if the oxidation rate is not consistent; and verifying that the oxidation rate is normal according to the check result, and calibrating the oxidation rate monitoring model if the oxidation rate is not in accordance with the check result, and carrying out progressive operation.
In the step c), the detection, verification and calibration of the oxide skin during the overhaul period are carried out by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallographic microscope analysis on an oxide skin sample and a pipe blockage sample, verifying the mechanism and rule of formation, growth and peeling of the oxide skin, providing an oxide skin control measure, eliminating the problems of oxide skin growth, peeling and pipe blockage, and verifying the safe operation of a boiler; otherwise, if the problems of scale growth, peeling and pipe blockage exist, verifying that the oxidation rate is abnormal, and otherwise, calibrating the oxidation rate monitoring model and progressing.
Claims (4)
1. A verification and calibration method for the oxidation rate of a high-temperature heating surface of a supercritical thermal generator set is characterized by comprising the following steps: the verification method comprises the following steps: the method comprises the following steps of verification and calibration during high-temperature oxide skin operation, field inspection verification and calibration during overhaul, and oxide skin detection verification and calibration during overhaul, wherein the method comprises the following specific steps:
a. the run-time validation and calibration is: during the operation, whether the oxidation rate is abnormal or not is synchronous with the wall temperature overtemperature, and the wall temperature is qualified after operation adjustment; if the corresponding oxidation rates are not normal, further calibrating the oxidation rate monitoring model, and gradually progressing;
b. the field inspection verification and calibration during the overhaul period are as follows: during maintenance, the scale peeling and pipe blocking conditions are checked through magnetic inspection and endoscopy, whether the oxidation rate monitoring results are consistent or not is verified, and if the oxidation rate monitoring results are not consistent, the oxidation rate monitoring model is further calibrated, and the steps are carried out;
c. the detection, verification and calibration of the oxide skin during the overhaul period are as follows: by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallography microscope analysis on an oxide skin sample and a pipe plugging sample, verifying the forming, growing and stripping mechanisms and rules of the oxide skin, providing oxide skin control measures, eliminating the problems of oxide skin growth, stripping and pipe plugging, and ensuring the safe operation of a unit; on the contrary, if the problems of scale growth, peeling and pipe blockage exist, the oxidation rate monitoring model is further verified and calibrated, and the steps are gradual;
d. and (c) verifying and calibrating the oxidation rate monitoring model in the steps a, b and c, and finally realizing the perfection of scale control measures and promoting the safe operation of the boiler.
2. The method for verifying and calibrating the oxidation rate of the high-temperature heating surface of the supercritical thermal generator set according to claim 1, wherein the method comprises the following steps:
in the step a, the verification and calibration during the operation period is to verify that the oxidation rate is abnormal through wall temperature overtemperature, verify that the wall temperature is overtemperature through the oxidation rate is abnormal, verify that the oxidation rate is normal through the wall temperature is qualified, and verify that the wall temperature is qualified through the oxidation rate is normal; when the wall temperature is qualified and the oxidation rate is abnormal, calibrating the oxidation rate monitoring model, and when the wall temperature is over-temperature and the oxidation rate is normal, calibrating the oxidation rate monitoring model and gradually progressing.
3. The method for verifying and calibrating the oxidation rate of the high-temperature heating surface of the supercritical thermal generator set according to claim 1, wherein the method comprises the following steps:
in the step b), the on-site examination verification and calibration during the overhaul period are to carry out the magnetic examination and the endoscopy on the typical part of the high-temperature heating surface of the boiler, verify that the oxidation rate is abnormal according to the examination result, and calibrate the oxidation rate monitoring model if the oxidation rate is not consistent; and verifying that the oxidation rate is normal according to the check result, and calibrating the oxidation rate monitoring model if the oxidation rate is not in accordance with the check result, and carrying out progressive operation.
4. The method for verifying and calibrating the oxidation rate of the high-temperature heating surface of the supercritical thermal generator set according to claim 1, wherein the method comprises the following steps:
in the step c), the detection, verification and calibration of the oxide skin during the overhaul period are carried out by carrying out X-ray diffraction analysis, scanning electron microscope analysis and optical metallographic microscope analysis on an oxide skin sample and a pipe blockage sample, verifying the forming, growing and stripping mechanism and rule of the oxide skin, providing the oxide skin control measure, eliminating the problems of oxide skin growth, stripping and pipe blockage, and verifying the safe operation of the boiler; otherwise, if the problems of scale growth, peeling and pipe blockage exist, verifying that the oxidation rate is abnormal, and otherwise, calibrating the oxidation rate monitoring model and progressing.
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