CN-121994909-A - Calibration sample tube device and method for ferrite furnace tube oxide scale accumulation detection

Abstract

The invention provides a checking sample tube device and a checking sample tube method for ferrite furnace tube oxide skin accumulation detection, which belong to the technical field of nondestructive detection equipment, and can at least partially solve the problems that the existing magnetic detection method lacks reliable detection reference for application on the ferrite furnace tube, and the radiation risk of the radiation detection method is high, the detection efficiency is low, the requirement on detection space is high and the detection is easy to miss.

Inventors

• CHENG JUN
• XU XIONGFEI
• CHEN ZHENG
• QIN CHENGPENG
• WANG FUGUI
• HU BOYAO
• WANG ZHIQIANG
• LI LIANG
• LI DONGJIANG
• WANG QIANG
• ZHAO LUN

Assignees

• 西安热工研究院有限公司

Dates

Publication Date

20260508

Application Date

20260104

Claims (10)

1. 1. The utility model provides a ferrite boiler tube oxide skin piles up detection and uses check-up sampling tube device which characterized in that includes the sampling tube, is equipped with on this sampling tube: A filling unit comprising a simulated medium which is filled in the interior of the sample tube during operation, A separation assembly comprising a plurality of spacers disposed on said sample tube for spacing and separating said analog medium within said sample tube during operation, and The sealing assembly comprises sealing pieces respectively arranged at the two end parts of the sampling tube; The isolating pieces are arranged at a plurality of preset positions on the sampling tube, so that the simulated medium forms different accumulation states on the same sampling tube.
2. 2. The calibration coupon device for detecting scale buildup in a ferrite furnace tube according to claim 1, wherein said coupon is a ferritic steel tube.
3. 3. The calibration coupon device for ferrite furnace tube scale buildup detection of claim 1, wherein said coupon comprises an elbow section for simulating a deposit or blockage condition of said simulated medium in an elbow region of said ferrite furnace tube.
4. 4. The calibration coupon device for detecting scale accumulation in a ferrite furnace tube according to claim 1, wherein the spacer is a high temperature resistant insulating sheet member, and the simulation medium is a scale medium.
5. 5. The calibration coupon device for ferrite furnace tube scale buildup detection of claim 4, wherein said spacer is a mica sheet.
6. 6. The calibration coupon device for detecting ferrite furnace tube scale deposit according to claim 1, wherein the coupon is provided with a plurality of mounting positions at the preset position, the mounting positions being arranged at intervals along the extending direction of the coupon.
7. 7. The calibration sampling apparatus for detecting scale accumulation in a ferrite furnace tube according to claim 1, wherein the attachment position is an insertion port provided on an outer wall surface of the sampling tube, and the spacer is inserted into an inner cavity of the sampling tube through the insertion port to form a partition for the dummy medium.
8. 8. The calibration coupon device for ferrite furnace tube scale buildup detection according to any one of claims 1 to 7, wherein said preset position of said coupon and said closure are provided with a hierarchical identifier for indicating a corresponding level of buildup of said simulated media.
9. 9. A method for verifying the detection of the scale buildup in a ferrite furnace tube, characterized in that the method is implemented by using the verification tube device for detecting the scale buildup in a ferrite furnace tube according to any one of claims 1 to 8, comprising the steps of: s1, acquiring a sample tube which is matched with the measured ferrite furnace tube specification, and filling the sample tube with the simulation medium; S2, limiting and separating the simulation media through the isolating piece to form at least two accumulation simulation areas, and enabling different accumulation simulation areas to correspond to different accumulation states; s3, detecting the sample tube by using magnetic detection equipment to be verified to obtain detection response of each stacking simulation area; and S4, adjusting parameters of the magnetic detection equipment according to the detection response, and evaluating the detection capability of the magnetic detection equipment.
10. 10. The method according to claim 9, wherein in the step S2, the different stacking states include a plurality of stacking levels divided by a predetermined classification threshold including the stacking levels expressed in percentage, and the same tube is formed to be different stacking states by changing the arrangement position of the separator on the tube.

Description

Calibration sample tube device and method for ferrite furnace tube oxide scale accumulation detection Technical Field The invention belongs to the technical field of nondestructive testing equipment, and particularly relates to a device and a method for a checking sample tube for ferrite furnace tube oxide skin accumulation detection. Background Under the background of a double-carbon target, the installed capacity of new energy is rapidly increased, and a power system has higher requirements on the peak regulation capacity of a thermal power unit. At present, most in-service thermal power generating units need to be in deep peak regulation and frequent start-stop operation working conditions for a long time, and the unit load rapidly fluctuates to enable the high-temperature heating surface furnace tube to bear repeated thermal shock, so that local temperature fields are unevenly distributed, and larger thermal stress is easy to generate. Because the oxide scale generated by the furnace tube matrix material and the inner wall of the furnace tube matrix material has obvious difference in thermal expansion coefficient, the oxide scale is easy to generate microcracks and gradually peel off under the repeated action of thermal stress. The peeled oxide skin is easy to accumulate in low flow velocity areas such as a lower elbow of a furnace tube under the action of medium flow, the heat conduction performance of the oxide skin is poor, the local heat transfer is deteriorated, the temperature of the tube wall of the covered area is rapidly increased, and finally, the overtemperature tube explosion accident is caused. The relevant statistics show that about 80% of in-service units have equipment damage caused by scale spalling in the investigation of 248 thermal power units by Edison corporation of the united states. In China, a large number of units have tube explosion accidents caused by the accumulation of oxide skin of a furnace tube of a high-temperature heating surface, the economic loss of single-time accident furnace shutdown rush repair can reach tens of millions of yuan, the safe and stable operation of the units is seriously threatened, and even the casualties can be caused; The 300MW and 600MW subcritical unit high-temperature heating surface furnace tubes in early operation are made of ferrite steel, and the inner wall oxide skin is continuously thickened along with the increase of service time. Under the working condition of long-term deep peak shaving, thicker oxide skin is more likely to be peeled off in a large area and deposited and blocked at the lower elbow, so that the flow area is reduced, the cooling capacity is obviously reduced, and the pipe explosion accident is induced in a short time. In recent years, the failure problem occurs in a plurality of domestic ferrite furnace tube units. At present, the detection method for oxide scale accumulation in the furnace tube mainly comprises a magnetic detection method and a radiation detection method. Among them, the magnetic detection method has been applied to austenitic stainless steel furnace tubes more mature, but because ferritic steel itself has ferromagnetism, the application of the method to ferritic furnace tubes lacks reliable detection references. Although the radiation detection method can be used for ferrite furnace tubes, the radiation detection method has the defects of high radiation risk, low detection efficiency, high requirement on detection space, easy omission and the like. Therefore, we propose a ferrite furnace tube oxide scale accumulation detection calibration tube device and method. Disclosure of Invention The invention aims to at least solve one of the technical problems in the prior art and provides a calibration sample tube device and a method for detecting oxide scale accumulation of a ferrite furnace tube. The invention provides a checking sample tube device for detecting oxide skin accumulation of a ferrite furnace tube, which comprises a sample tube, wherein the sample tube is provided with: A filling unit comprising a simulated medium which is filled in the interior of the sample tube during operation, A separation assembly comprising a plurality of spacers disposed on said sample tube for spacing and separating said analog medium within said sample tube during operation, and The sealing assembly comprises sealing pieces respectively arranged at the two end parts of the sampling tube; The isolating pieces are arranged at a plurality of preset positions on the sampling tube, so that the simulated medium forms different accumulation states on the same sampling tube. Further, the coupon is a ferritic steel tube. Specifically, the sampling tube comprises an elbow section for simulating the deposition or blockage working condition of the simulation medium in the elbow region of the ferrite furnace tube. Specifically, the separator is a high-temperature resistant insulating sheet-shaped member, and the simulation medium