A detection method used in the heat treatment process of a spherical storage tank

Abstract

The present invention belongs to a detection method used in the heat treatment process of a spherical storage tank; this detection method is to detect the external temperature of the thermal insulation layer of the spherical storage tank by using a temperature detection device during the heat treatment process of the spherical storage tank; it has the advantages of reasonable process design, strong controllability, high quality inspection accuracy rate, saving detection time, increasing the qualified rate of the spherical storage tank after heat treatment, and reducing the production cost of the enterprise.

Description

Technical Field

[0001] The present invention belongs to the technical field of spherical storage tank detection, and particularly relates to a detection method used in the heat treatment process of a spherical storage tank. Background Art

[0002] With the rapid development of science and technology, spherical storage tanks currently play an irreplaceable role in industrial development. They are indispensable in fields such as petroleum, chemical industry, national defense, medical treatment, and transportation, and even in our daily lives. The spherical storage tank shell is uniformly stressed. Under the same diameter and working conditions, the membrane stress of a spherical container is only half of the circumferential stress of a cylindrical container, and the corresponding pressure-bearing capacity is strong; and the spherical shell has the smallest surface area and the lightest mass under the same volume. However, due to the large volume of the spherical storage tank, the manufacturer needs to form the spherical shell plates, and the installation unit assembles and welds them on site. The manufacturing and installation have certain difficulties and relatively high technical requirements.

[0003] For the above reasons, China has issued the corresponding national standard GB50094-2010 "Code for Construction of Spherical Storage Tanks". This code includes the inspection and acceptance of components, on-site assembly, welding, weld inspection, post-weld overall heat treatment, testing of specimens, and pressure and leakage tests, etc.; among them, post-weld overall heat treatment is a key step in the process of preparing spherical storage tanks. In the above-mentioned code for post-weld overall heat treatment, detailed regulations are made on the heat treatment temperature, heating rate, insulation layer, and temperature measurement points inside the spherical storage tank; specifically, it is determined whether the hardness of the spherical storage tank after the above heat treatment meets the corresponding standards by testing the specimens later. The above national standard has the following defects: 1. According to the detection method in the national standard, only the temperature of the fixed detection points between the spherical storage tank and the insulation layer can be monitored for detection, and the temperature of a certain line or area of the spherical storage tank cannot be detected as a whole. Especially when the temperature is abnormal, it cannot be discovered and solved in time; 2. After heat treatment, the specimens need to be sent to a special laboratory for testing. The above detection process is cumbersome and the results are issued slowly, seriously affecting the progress of on-site construction; 3. Especially when the specimens tested in the laboratory are unqualified, it proves that the entire spherical storage tank is unqualified; directly resulting in a large consumption of manpower and physical resources, and at the same time increasing the purchase cost of the spherical storage tank; 4. The specimens sent to the laboratory for testing are generally set at the top of the spherical storage tank during the heat treatment process, and this position is relatively good; the laboratory only detects the above specimens and cannot reflect the true heat treatment status of the entire spherical storage tank. Summary of the Invention

[0004] The object of the present invention is to overcome the defects in the prior art, and to provide a detection method used in the heat treatment process of a spherical storage tank, which has a reasonable process design, strong controllability, and can perform 720° dead-angle-free detection on the external temperature of the insulation layer of the spherical tank, so as to improve the heat treatment accuracy of the spherical tank, take remedial measures when the temperature of the spherical tank is abnormal, and change the quality inspection of heat treatment from after heat treatment to during heat treatment, saving time costs, improving the qualified rate of heat treatment of the spherical storage tank, and being able to detect the whole spherical storage tank to ensure product quality.

[0005] The object of the present invention is achieved as follows:

[0006] A detection method used in the heat treatment process of a spherical storage tank, which is to detect the external temperature of the thermal insulation cotton layer of the spherical storage tank by using a temperature detection device during the heat treatment process of the spherical storage tank.

[0007] Preferably, the temperature detection device is an unmanned aerial vehicle thermal imaging device and an infrared camera, and 720° dead-angle-free detection is performed on the outside of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process by the unmanned aerial vehicle thermal imaging device and the infrared camera.

[0008] Preferably, the unmanned aerial vehicle thermal imaging device detects the upper temperature of the spherical storage tank, and the infrared camera detects the lower temperature of the spherical storage tank.

[0009] Preferably, the number of temperature detections of the spherical storage tank by using the unmanned aerial vehicle thermal imaging device and the infrared camera is at least two times.

[0010] Preferably, the two temperature detections are as follows: the first temperature detection is performed when the temperature inside the spherical storage tank is 200 - 300 °C; the second temperature detection is performed when the temperature inside the spherical storage tank is 575 °C - 625 °C.

[0011] A detection method used in the heat treatment process of a spherical storage tank, which comprises the following steps:

[0012] Step 1: Place the ignition device at the bottom of the spherical storage tank, and the top of the spherical storage tank is the smoke exhaust port;

[0013] Step 2: Wrap a double-layer thermal insulation cotton layer on the outer surface of the spherical storage tank. Each layer of thermal insulation cotton layer contains several thermal insulation cotton strips. The joints of the thermal insulation cotton strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank is reserved;

[0014] Step 3: Heat the inside of the spherical storage tank by igniting the ignition device to raise the temperature of the spherical storage tank, and control the heating rate according to the national standard GB50094 - 2010 specification;

[0015] Step 4: When the temperature inside the spherical storage tank is 200 - 300 °C, use a drone thermal imaging device to detect the temperature at the upper part of the spherical storage tank, and use an infrared camera to detect the temperature at the lower part of the spherical storage tank; when the temperature measured above is within the ambient temperature to 100 °C, it is judged as qualified; when the temperature is not less than 100 °C, it is judged as unqualified, which proves that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip.

[0016] Step 5: When it is judged as unqualified in Step 4 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank through the drone thermal imaging device and the infrared camera. When the temperature after re-measurement is within 100 °C, it is judged as qualified.

[0017] Step 6: When it is judged as qualified in the above Step 4 or Step 5, the temperature inside the spherical storage tank continues to rise. When the temperature inside the spherical storage tank rises to 575 - 625 °C, the drone thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank; when the temperature measured above is within the ambient temperature to 150 °C, it is judged as qualified; when the temperature is not less than 150 °C, it is judged as unqualified, which proves that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip.

[0018] Step 7: When it is judged as unqualified in Step 5 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank through the drone thermal imaging device and the infrared camera. When the measured temperature is within 150 °C, it is judged as qualified.

[0019] Step 8: When it is judged as qualified in the above Step 6 or Step 7, perform constant temperature and cooling treatment on the spherical storage tank according to the national standard GB50094 - 2010 specification.

[0020] Preferably, the volume of the spherical storage tank is 50 - 5000 cubic meters.

[0021] Preferably, in the double-layer thermal insulation cotton layer in Step 2, the joints of several thermal insulation cotton strips in the same layer are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line.

[0022] Preferably, a thermocouple thermometer is provided on the outer surface of the spherical storage tank.

[0023] Preferably, the hardness of the spherical storage tank after the constant temperature and cooling treatment in step 8 is re-inspected; the tool for re-inspection is a Leeb hardness tester; the re-inspection steps include removing the thermal insulation cotton on the outer surface of the spherical storage tank, and after removal, manually using the Leeb hardness tester to detect the hardness of the top, bottom, middle, upper and lower parts of the outer surface of the spherical storage tank respectively; for at least two random hardness detection points on the top and bottom of the outer surface of the spherical storage tank, and at least four random hardness detection points on the middle, upper and lower parts of the outer surface of the spherical storage tank; if the detected Brinell hardness of the above hardness detection points is 130-200, the re-inspection is qualified.

[0024] A detection method used in the heat treatment process of a spherical storage tank prepared according to the above scheme. This method abandons the form of only detecting specimens in traditional technologies. By studying the relationship between the internal temperature of the spherical storage tank and the external temperature of the thermal insulation layer of the spherical storage tank, a 720° non-dead-angle detection of the external temperature of the thermal insulation layer of the spherical storage tank is carried out. The quality inspection after heat treatment is changed to in-process quality inspection. At the same time, when the temperature of the thermal insulation layer of the spherical storage tank is abnormal, it can be processed and remedied in time, improving the accuracy of quality inspection while increasing the qualified rate of the spherical storage tank after heat treatment; at the same time, the present invention also sets up a re-inspection procedure. The re-inspection process is a further supplement to the above detection method, and it is also a detection of the hardness of the spherical storage tank as a whole to control its quality; it has the advantages of reasonable process design, strong controllability, high accuracy of quality inspection, saving detection time, increasing the qualified rate of the spherical storage tank after heat treatment, and reducing the production cost of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the present invention.

[0026] Figure 2 It is another schematic structural diagram of the present invention;

[0027] Figure 3 It is a schematic diagram of the joint of the inner thermal insulation cotton strip and the outer thermal insulation cotton strip of the double-layer thermal insulation cotton layer of the present invention;

[0028] Figure 4 It is a schematic diagram of the joint of the outer thermal insulation cotton strip of the double-layer thermal insulation cotton layer of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] For a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. To make the drawings concise, only the parts related to the invention are schematically shown in each drawing, and they do not represent their actual structures as products.

[0030] As Figures 1 - 4As shown, the present invention is a detection method used in the heat treatment process of a spherical storage tank. This detection method is to detect the external temperature of the insulation layer of the spherical storage tank by using a temperature detection device during the heat treatment process of the spherical storage tank. It should be clear that: the traditional method for detecting the internal temperature of a spherical storage tank is only the requirement for the internal temperature of the spherical storage tank during the heat treatment process; the present invention does not omit the detection of the internal temperature of the spherical storage tank, but on this basis, adds the detection of the external temperature of the insulation layer of the spherical storage tank, that is, this detection is equivalent to the detection of sending specimens to a specialized laboratory in the traditional technology; the present invention changes the post-heat treatment detection in the traditional technology to in-process detection during heat treatment, which can not only save the time of post-detection, but also timely adjust the abnormal temperature during the detection process to achieve the purpose of improving the heat treatment qualification rate. The temperature detection device described in the present invention can be a temperature measurement tool in contact with the outside of the insulation layer, a temperature measurement tool held by on-site personnel, or a temperature measurement tool carried in the form of a drone.

[0031] Furthermore, the temperature detection device is a drone thermal imaging device and an infrared camera, and the outside of the insulation layer of the spherical storage tank during the heat treatment process is detected 360° without dead angles by the drone thermal imaging device and the infrared camera. In the present invention, the temperature of the outside of the insulation layer of the spherical storage tank is measured and controlled, and the measurement and control is 360° without dead angles detection, which can realize the control of the overall heat treatment situation of the spherical storage tank to avoid unqualified situations caused by local temperature anomalies. The temperature detection device described in the present invention can be the cooperation of the drone thermal imaging device and the infrared camera to measure and control the temperature.

[0032] Furthermore, the drone thermal imaging device detects the upper temperature of the spherical storage tank, and the infrared camera is used to detect the lower temperature of the spherical storage tank. The present invention is applicable to all types and models of spherical storage tanks, especially large spherical storage tanks. Since the temperature of the insulation layer of the spherical storage tank is too high during the heat treatment process and it is not conducive to on-site operators to perform full-range temperature measurement, the drone thermal imaging device can be used to measure the temperature of the upper part of the spherical storage tank, and the ground personnel hold the infrared camera to measure the temperature of the lower part of the spherical storage tank to achieve the purpose of full-range control of the temperature of the insulation layer of the spherical storage tank; at the same time, it also improves the detection speed and the safety of on-site workers.

[0033] Further, the spherical storage tank is detected and its temperature is measured at least twice by using the UAV thermal imaging device and the infrared camera. The temperature measurement outside the thermal insulation layer of the spherical storage tank in the present invention can be carried out randomly, and the number of temperature measurement times is not limited but at least twice. The first time should be when the spherical storage tank is in the middle of the heating process. At this time, the spherical storage tank expands under the action of thermal expansion and contraction, and the thermal insulation layer is prone to cracking. However, after the thermal insulation layer cracks, local continuous heating cannot be realized, thus affecting the heat treatment process of the spherical storage tank. The second time is to measure the temperature during the end of the heating process and the period when the heat preservation process is about to start or has already started. At this time, the temperature inside the spherical storage tank has reached the peak and gradually tends to be stable. At this time, the thermal insulation layer is not only prone to cracking but also has a greater impact on the subsequent heat preservation process, which is directly related to the qualification rate of heat treatment. Therefore, temperature measurement is required.

[0034] Further, the two temperature measurements are as follows: the first temperature measurement is carried out when the temperature inside the spherical storage tank is 200 - 300 °C; the second temperature measurement is carried out when the temperature inside the spherical storage tank is 575 °C - 625 °C. For the above two temperature measurements, one is roughly in the middle of the heating and temperature rising process, and the other is at the end of the heating and temperature rising process and the period when the heat preservation process is about to start or has already started. It should be particularly noted that if the spherical storage tank does not need to be heated to 625 °C, the temperature measurement can be carried out according to the corresponding temperature in the national standard during the heating and temperature rising process.

[0035] A detection method used in the heat treatment process of a spherical storage tank includes the following steps:

[0036] Step 1: Place the ignition device 2 at the bottom of the spherical storage tank 1, and the top of the spherical storage tank 1 is the smoke exhaust port 3;

[0037] Step 2: Wrap a double-layer thermal insulation layer 4 on the outer surface of the spherical storage tank 1. Each layer of the thermal insulation layer contains several thermal insulation strips, and the joints of the thermal insulation strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank 1 is reserved;

[0038] Step 3: Heat the inside of the spherical storage tank 1 by using the ignition device 2 to achieve the temperature rise of the spherical storage tank 1, and control the heating rate according to the national standard GB50094 - 2010 specification;

[0039] Step 4: When the temperature inside the spherical storage tank 1 is 200 - 300 °C, use the UAV thermal imaging device to detect the upper temperature of the spherical storage tank 1, and use the infrared camera to detect the lower temperature of the spherical storage tank 1; when the temperature of the above temperature measurement is within the ambient temperature to 100 °C, it is determined to be qualified; when the temperature is not less than 100 °C, it is determined to be unqualified, which proves that the thermal insulation strip here fails, and organize on-site personnel to re-fix the thermal insulation strip;

[0040] Step 5: When it is determined as unqualified in Step 4 and the thermal insulation cotton strip is re-fixed, the temperature of the spherical storage tank is detected again through the UAV thermal imaging device and the infrared camera. When the temperature after re-measurement is within 100 °C, it is determined as qualified;

[0041] Step 6: When it is determined as qualified in Step 4 or Step 5 above, the temperature inside the spherical storage tank 1 continues to rise. When the temperature inside the spherical storage tank 1 rises to 575 °C - 625 °C, the UAV thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank 1. When the temperature measured above is within the ambient temperature to 150 °C, it is determined as qualified; when the temperature is not less than 150 °C, it is determined as unqualified, indicating that the thermal insulation cotton strip here has failed, and the on-site personnel are organized to re-fix the thermal insulation cotton strip;

[0042] Step 7: When it is determined as unqualified in Step 5 and the thermal insulation cotton strip is re-fixed, the temperature of the spherical storage tank 1 is detected again through the UAV thermal imaging device and the infrared camera. When the measured temperature is within 150 °C, it is determined as qualified;

[0043] Step 8: When it is determined as qualified in Step 6 or Step 7 above, the spherical storage tank 1 is subjected to constant temperature and cooling treatment in accordance with the national standard GB50094 - 2010 specification.

[0044] Further, the volume of the spherical storage tank 1 is 50 - 5000 cubic meters.

[0045] Further, the joints of several thermal insulation cotton strips in the same layer of the double-layer thermal insulation cotton layer 4 in Step 2 are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line. Through the above settings, the purpose of improving the thermal insulation effect, reducing heat loss, and preventing the simultaneous cracking of the outer and inner insulation layers, thereby affecting the heat treatment quality, can be achieved.

[0046] Further, a thermocouple thermometer 5 is provided on the outer surface of the spherical storage tank 1. The thermocouple thermometer 5 is mainly used to detect the temperature inside the spherical storage tank 1 to meet the requirements for the temperature of the spherical storage tank 1 in the corresponding national standard and the detection method of the present invention.

[0047] Furthermore, the hardness of the spherical storage tank 1 after the constant temperature and cooling treatments in step 8 is reinspected; the tool for reinspection is a Leeb hardness tester; the reinspection steps include removing the thermal insulation cotton on the outer surface of the spherical storage tank 1, and after removal, manually using the Leeb hardness tester to detect the hardness of the top, bottom, middle, upper part, and lower part of the outer surface of the spherical storage tank 1 respectively; for at least two random hardness detection points on the top and bottom of the outer surface of the spherical storage tank 1, and at least four random hardness detection points on the middle, upper part, and lower part of the outer surface of the spherical storage tank 1; if the Brinell hardness detected at the above hardness detection points is 130 - 200, the reinspection is qualified. The detection method of the present invention is different from the national standard detection method. In order to ensure the accuracy of the detection method of the present invention and to have a macroscopic understanding of the overall hardness of the spherical storage tank, a Leeb hardness tester is used to reinspect the spherical storage tank 1 after heat treatment. The tool for reinspection in the present invention is a Leeb hardness tester, which avoids leaving obvious indentations on the surface of the spherical storage tank 1 when using a Brinell hardness tester, thus causing safety and quality risks; both the detection method and the reinspection method in the present invention are directly aimed at the spherical storage tank 1, and it can comprehensively detect the quality of the spherical storage tank 1 after heat treatment, avoiding the defect of only detecting specimens in the conventional method (that is: changing from the original indirect quality inspection (detecting test plates) to detecting the entity of the spherical storage tank 1).

[0048] Based on the existing national standard GB50094-2010 "Code for Construction of Spherical Storage Tanks", the present invention abandons the drawbacks of the traditional quality inspection that only detects specimens afterwards, but instead detects the external temperature of the overall spherical storage tank 1. The essence of this detection method is to monitor the overall heat treatment process of the spherical storage tank 1 to ensure the heat treatment result; it has the following characteristics: 1. In terms of detection timeliness, the detection result that used to be issued by the laboratory in at least one week is changed to be issued within at most two hours after the re-inspection is completed; 2. In terms of construction cost, the conclusion of the original detection method is issued relatively slowly, and construction can only be carried out after waiting for the conclusion, which affects the subsequent continuous operation; while the present invention can save the labor cost; 3. In terms of detection nodes, the quality inspection after heat treatment is changed to quality inspection during the heat treatment process, and during the quality inspection process of the present invention, if the temperature is abnormal, the heat treatment plan can be adjusted in time, so as to control it during the heat treatment process and avoid the phenomenon of unqualified final heat treatment, thereby improving the qualified rate of heat treatment. 4. Although the temperature detected in the present invention is detected from the outside of the insulation layer of the spherical storage tank 1, it can detect the overall area of the spherical storage tank 1, avoiding the defect that only the temperature measurement points inside the spherical storage tank 1 are measured in the prior art and the overall heat treatment process cannot be understood. 5. In terms of the detection object, the present invention changes from the original indirect quality inspection (detecting test plates) to detecting the entity of the spherical storage tank 1. And for the detection equipment, an unmanned aerial vehicle thermal imaging device and an infrared camera and other related equipment are selected, which are not only efficient but also safe; at the same time, during the re-inspection process, a Leeb hardness tester that will not cause safety and quality risks is selected (a Brinell hardness tester will leave obvious indentations on the surface of the object to be inspected, with safety and quality risks), avoiding the safety and quality risks of detection.

[0049] In order to explain the present invention in more detail, the present invention will be further elaborated below in conjunction with embodiments. The specific embodiments are as follows:

[0050] Embodiment 1

[0051] A detection method used in the heat treatment process of a spherical storage tank, the detection method comprising the following steps:

[0052] Step 1: Place the ignition device 2 at the bottom of the spherical storage tank 1, and the top of the spherical storage tank 1 is the smoke exhaust port 3;

[0053] Step 2: Wrap a double-layer insulation cotton layer 4 on the outer surface of the spherical storage tank 1, each layer of insulation cotton layer respectively comprises a plurality of insulation cotton strips, and the joints of the insulation cotton strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank 1 is reserved;

[0054] Step 3: Heat the inside of the spherical storage tank 1 by the ignition device 2 to realize the temperature rise of the spherical storage tank 1, and control the heating rate according to the national standard GB50094-2010 specification;

[0055] Step 4: When the temperature inside the spherical storage tank 1 is 200°C, use a drone thermal imaging device to detect the temperature of the upper part of the spherical storage tank 1, and use an infrared camera to detect the temperature of the lower part of the spherical storage tank 1; when the temperature measured above is 85°C, it is determined to be qualified;

[0056] Step 5: After the determination is qualified in the above Step 4, the temperature inside the spherical storage tank 1 continues to rise. When the temperature inside the spherical storage tank 1 rises to 575°C, the drone thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank 1; when the temperature measured above is 140°C, it is determined to be qualified;

[0057] Step 8: After the determination is qualified in the above Step 5, perform constant temperature and cooling treatment on the spherical storage tank 1 in accordance with the national standard GB50094-2010 specification.

[0058] The above detection method is to detect the external temperature of the thermal insulation cotton layer of the spherical storage tank by using a temperature detection device during the heat treatment process of the spherical storage tank. The temperature detection device is a drone thermal imaging device and an infrared camera, and the external part of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process is detected without dead angle by 720° through the drone thermal imaging device and the infrared camera. The drone thermal imaging device detects the temperature of the upper part of the spherical storage tank, and the infrared camera is used to detect the temperature of the lower part of the spherical storage tank. The number of times of temperature measurement of the spherical storage tank by using the drone thermal imaging device and the infrared camera is at least two times. The two temperature measurements are respectively: the first temperature measurement is performed when the temperature inside the spherical storage tank is 200°C; the second temperature measurement is performed when the temperature inside the spherical storage tank is 575°C. The volume of the spherical storage tank 1 is 50 cubic meters. In the double-layer thermal insulation cotton layer 4 in Step 2, the joints of several thermal insulation cotton strips in the same layer are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line. A thermocouple thermometer 5 is arranged on the outer surface of the spherical storage tank 1.

[0059] Example 2

[0060] A detection method used in the heat treatment process of a spherical storage tank, the detection method includes the following steps:

[0061] Step 1: Place the ignition device 2 at the bottom of the spherical storage tank 1, and the top of the spherical storage tank 1 is the smoke exhaust port 3;

[0062] Step 2: Wrap a double-layer thermal insulation cotton layer 4 on the outer surface of the spherical storage tank 1. Each layer of thermal insulation cotton layer contains several thermal insulation cotton strips. The joints of the thermal insulation cotton strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank 1 is reserved;

[0063] Step 3: Heat the inside of the spherical storage tank 1 through the ignition device 2 to raise the temperature of the spherical storage tank 1, and control the heating rate according to the national standard GB50094-2010 specification;

[0064] Step 4: When the temperature inside the spherical storage tank 1 is 300 °C, use a drone thermal imaging device to detect the temperature of the upper part of the spherical storage tank 1, and use an infrared camera to detect the temperature of the lower part of the spherical storage tank 1; when the temperature measured above is 99.5 °C, it is judged as qualified;

[0065] Step 5: When it is judged as qualified in the above Step 4, the inside of the spherical storage tank 1 continues to heat up. When the inside of the spherical storage tank 1 heats up to 625 °C, the drone thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank 1; when the temperature measured above is 150 °C, it is judged as unqualified, which proves that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip;

[0066] Step 6: When it is judged as unqualified in Step 5 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank 1 through the drone thermal imaging device and the infrared camera. When the measured temperature is 149.5 °C, it is judged as qualified;

[0067] Step 7: When it is judged as qualified in the above Step 6, perform constant temperature and cooling treatment on the spherical storage tank 1 according to the national standard GB50094-2010 specification.

[0068] Step 8: Re-check the hardness of the spherical storage tank 1 after the constant temperature and cooling treatment in Step 8; the re-check tool is a Leeb hardness tester; the re-check steps include removing the thermal insulation cotton on the outer surface of the spherical storage tank 1, and after removal, manually use the Leeb hardness tester to detect the hardness of the top, bottom, middle, upper and lower parts of the outer surface of the spherical storage tank 1 respectively; for at least two random hardness detection points on the top and bottom of the outer surface of the spherical storage tank 1, and at least four random hardness detection points on the middle, upper and lower parts of the outer surface of the spherical storage tank 1; through the above re-check, it can be seen that the average Brinell hardness of the above hardness detection points is 158.46, and the spherical storage tank after heat treatment in this embodiment is qualified.

[0069] The above detection method is to use a temperature detection device to detect the external temperature of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process of the spherical storage tank. The temperature detection device is an unmanned aerial vehicle (UAV) thermal imaging device and an infrared camera, and the external part of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process is detected without dead angle by the UAV thermal imaging device and the infrared camera. The UAV thermal imaging device detects the temperature of the upper part of the spherical storage tank, and the infrared camera is used to detect the temperature of the lower part of the spherical storage tank. The number of times of detecting and measuring the temperature of the spherical storage tank by using the UAV thermal imaging device and the infrared camera is at least two times. The two temperature measurements are respectively: the first temperature measurement is carried out when the temperature inside the spherical storage tank is 300 °C; the second temperature measurement is carried out when the temperature inside the spherical storage tank is 625 °C. The volume of the spherical storage tank 1 is 5000 cubic meters. In the double-layer thermal insulation cotton layer 4 in step 2, the joints of several thermal insulation cotton strips in the same layer are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line. A thermocouple thermometer 5 is arranged on the outer surface of the spherical storage tank 1.

[0070] Example 3

[0071] A detection method used in the heat treatment process of a spherical storage tank, the detection method comprising the following steps:

[0072] Step 1: Place the ignition device 2 at the bottom of the spherical storage tank 1, and the top of the spherical storage tank 1 is the smoke exhaust port 3;

[0073] Step 2: Wrap a double-layer thermal insulation cotton layer 4 on the outer surface of the spherical storage tank 1, each layer of thermal insulation cotton layer respectively comprises several thermal insulation cotton strips, and the joints of the thermal insulation cotton strips in the same layer are fixed by steel wires and the expansion amount of the spherical storage tank 1 is reserved;

[0074] Step 3: Heat the inside of the spherical storage tank 1 by burning through the ignition device 2 to achieve the temperature rise of the spherical storage tank 1, and control the heating rate according to the national standard GB50094-2010 specification;

[0075] Step 4: When the temperature inside the spherical storage tank 1 is 250 °C, use the UAV thermal imaging device to detect the temperature of the upper part of the spherical storage tank 1, and use the infrared camera to detect the temperature of the lower part of the spherical storage tank 1; when the temperature of the above temperature measurement is 101 °C, it is determined as unqualified, which proves that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip;

[0076] Step 5: When it is determined as unqualified in step 4 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank by using the UAV thermal imaging device and the infrared camera, and when the temperature after re-measuring the temperature is 60 °C, it is determined as qualified;

[0077] Step 6: After passing the judgment in Step 5 above, the temperature inside the spherical storage tank 1 continues to rise. When the temperature inside the spherical storage tank 1 rises to 600 °C, the UAV thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank 1; when the temperature measured above is from the ambient temperature to 152 °C, it is judged as unqualified, indicating that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip;

[0078] Step 7: When it is judged as unqualified in Step 6 and the thermal insulation cotton strip is re-fixed, the temperature of the spherical storage tank 1 is detected again through the UAV thermal imaging device and the infrared camera. When the measured temperature is within 130 °C, it is judged as qualified;

[0079] Step 8: After passing the judgment in Step 7 above, the spherical storage tank 1 is subjected to constant temperature and cooling treatment in accordance with the national standard GB50094-2010 specification.

[0080] The above detection method is to detect the external temperature of the thermal insulation cotton layer of the spherical storage tank by using a temperature detection device during the heat treatment process of the spherical storage tank. The temperature detection device is a UAV thermal imaging device and an infrared camera, and the external part of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process is detected without dead angle by 720°. The UAV thermal imaging device detects the upper temperature of the spherical storage tank, and the infrared camera is used to detect the lower temperature of the spherical storage tank. The number of times of detecting and measuring the temperature of the spherical storage tank by using the UAV thermal imaging device and the infrared camera is at least two times. The two temperature measurements are respectively: the first temperature measurement is carried out when the temperature inside the spherical storage tank is 250 °C; the second temperature measurement is carried out when the temperature inside the spherical storage tank is 600 °C. The volume of the spherical storage tank 1 is 2500 cubic meters. In the double-layer thermal insulation cotton layer 4 in Step 2, the joints of several thermal insulation cotton strips in the same layer are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line. A thermocouple thermometer 5 is arranged on the outer surface of the spherical storage tank 1.

[0081] Example 4

[0082] A detection method used in the heat treatment process of a spherical storage tank, the detection method includes the following steps:

[0083] Step 1: Place the ignition device 2 at the bottom of the spherical storage tank 1, and the top of the spherical storage tank 1 is the smoke exhaust port 3;

[0084] Step 2: Wrap a double-layer thermal insulation cotton layer 4 on the outer surface of the spherical storage tank 1. Each layer of thermal insulation cotton layer contains several thermal insulation cotton strips. The joints of the thermal insulation cotton strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank 1 is reserved;

[0085] Step 3: Heat the interior of the spherical storage tank 1 by means of the ignition device 2 to raise the temperature of the spherical storage tank 1, and control the heating rate in accordance with the national standard GB50094-2010 specification;

[0086] Step 4: When the temperature inside the spherical storage tank 1 reaches 270 °C, use an unmanned aerial vehicle thermal imaging device to detect the temperature of the upper part of the spherical storage tank 1, and use an infrared camera to detect the temperature of the lower part of the spherical storage tank 1; when the temperature measured above is from the ambient temperature to 100 °C, it is judged as unqualified, which proves that the thermal insulation cotton strip here has failed, and organize on-site personnel to re-fix the thermal insulation cotton strip;

[0087] Step 5: When it is judged as unqualified in Step 4 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank through the unmanned aerial vehicle thermal imaging device and the infrared camera. When the temperature after re-measurement is 86 °C, it is judged as qualified;

[0088] Step 6: When it is judged as qualified in the above Step 5, continue to raise the temperature inside the spherical storage tank 1. When the temperature inside the spherical storage tank 1 rises to 605 °C, the unmanned aerial vehicle thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank 1; when the temperature measured above is from the ambient temperature to 140 °C, it is judged as qualified;

[0089] Step 7: When it is judged as qualified in the above Step 6, perform constant temperature and cooling treatment on the spherical storage tank 1 in accordance with the national standard GB50094-2010 specification.

[0090] The above detection method is to detect the external temperature of the thermal insulation cotton layer of the spherical storage tank by using a temperature detection device during the heat treatment process of the spherical storage tank. The temperature detection device is an unmanned aerial vehicle thermal imaging device and an infrared camera, and the external part of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process is detected without dead angle by 720° through the unmanned aerial vehicle thermal imaging device and the infrared camera. The unmanned aerial vehicle thermal imaging device detects the temperature of the upper part of the spherical storage tank, and the infrared camera is used to detect the temperature of the lower part of the spherical storage tank. The number of times of detecting and measuring the temperature of the spherical storage tank by using the unmanned aerial vehicle thermal imaging device and the infrared camera is at least two times. The two temperature measurements are respectively: the first temperature measurement is performed when the temperature inside the spherical storage tank is 270 °C; the second temperature measurement is performed when the temperature inside the spherical storage tank is 605 °C. The volume of the spherical storage tank 1 is 4000 cubic meters. The joints of several thermal insulation cotton strips in the same layer of the double-layer thermal insulation cotton layer 4 in Step 2 are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line. A thermocouple thermometer 5 is arranged on the outer surface of the spherical storage tank 1.

[0091] Test Example 1 For a chemical project, heat treatment was carried out on a 650-cubic-meter spherical storage tank, and the relevant detection method in Example 1 was selected; there are two differences in the actual use of this detection method: 1. The volume of the spherical storage tank in the original Example 2 was 5000 cubic meters, and the volume of the spherical storage tank in this test example is 650 cubic meters; 2. Before using the above detection method, the test piece was placed at the smoke exhaust port 3 on the top of the spherical storage tank 1 without affecting smoke exhaust.

[0092] The time of the above detection method was December 2, 2021. After the detection method was completed, according to the detection method of the present invention, the heat treatment of the spherical storage tank was determined to be qualified. By re-inspection, at least two hardness detection points were randomly selected at the top and bottom of the outer surface of the spherical storage tank 1, and at least four hardness detection points were randomly selected in the middle, upper and lower parts of the outer surface of the spherical storage tank 1; the average values of the above five hardness detection points are as follows in the table:

[0093] Inspection locations of spherical storage tanks Mean Leeb hardness Mean Brinell hardness Top 405.83 148.25 Upper part 434.78 168.17 Middle part 433.85 167.55 Lower part 431.58 165.83 Bottom 400.33 142.50

[0094]

[0095] Through the above detection of the present invention, it can be seen that the heat treatment of the present invention is qualified. Further, the test piece was detected. The test piece was removed and sent to the laboratory for detection. It was orally agreed that the result would be completed in about 10 days, and the paper conclusion was issued on the 18th of December 2021, taking 14 days in total (the time for removing the thermal insulation cotton and test blocks and transportation was not calculated). The test conclusion in the report is that the heat treatment is qualified.

[0096] From the above content, it can be seen that the conclusion of the detection method of the present invention is consistent with that of the conventional detection method; however, the judgment result of the present invention is issued faster.

[0097] Test Example 2 On December 10, 2021, a chemical project carried out heat treatment on a 1000-cubic-meter spherical storage tank; its detection method includes the following steps: Step 1: Place the ignition device 2 at the bottom of the spherical storage tank 1, and the top of the spherical storage tank 1 is the smoke exhaust port 3; place the test piece on the smoke exhaust port 3; Step 2: Wrap a double-layer thermal insulation cotton layer 4 on the outer surface of the spherical storage tank 1. Each layer of thermal insulation cotton layer contains several thermal insulation cotton strips. The joints of the thermal insulation cotton strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank 1 is reserved; Step 3: Use the ignition device 2 to heat the inside of the spherical storage tank 1 by combustion to achieve the temperature rise of the spherical storage tank 1, and control the heating rate according to the national standard GB50094-2010 specification; Step 4: When the temperature inside the spherical storage tank 1 is 300 °C, use an unmanned aerial vehicle thermal imaging device to detect the upper temperature of the spherical storage tank 1, and use an infrared camera to detect the lower temperature of the spherical storage tank 1; when the temperature measured above is 99.5 °C, it is determined to be qualified;

[0098] Step 5: After being judged as qualified in the above step 4, the temperature inside the spherical storage tank 1 continues to rise. When the temperature inside the spherical storage tank 1 rises to 625°C, the drone thermal imaging device and the infrared camera measure the temperature of the surface of the spherical storage tank 1 for the second time; when the temperature measured is 150°C, it is judged as unqualified;

[0099] Step 6: When the above step 5 is judged as unqualified, the spherical storage tank 1 is subjected to constant temperature and cooling treatment according to the national standard GB50094-2010.

[0100] Step 7: Re-check the hardness of the spherical storage tank 1 after the constant temperature and cooling treatment in step 7; the re-check tool is a Leeb hardness tester; the re-check step includes removing the insulation cotton on the outer surface of the spherical storage tank 1, and after removal, manually testing the hardness of the top, bottom, middle, upper and lower parts of the outer surface of the spherical storage tank 1 by a Leeb hardness tester; at least two hardness test points are randomly selected on the top and bottom of the outer surface of the spherical storage tank 1, and at least four hardness test points are randomly selected on the middle, upper and lower parts of the outer surface of the spherical storage tank 1; the test results are as follows:

[0101] Inspection locations of spherical storage tanks Mean Leeb hardness Mean Brinell hardness Top 433.00 167.00 Upper part 436.00 169.00 Middle part 450.00 178.00 Lower part 451.00 180.00 Bottom 461.67 188.00

[0102]

[0103] Through the above-mentioned detection method and re-inspection proof, it can be known that the spherical storage tank after heat treatment is unqualified (the hardness of the second hardness detection point in the upper part is 202.5, and the hardness of the second hardness detection point in the middle part is 201.23); and the test plate was sent to the laboratory for testing, and the mechanical property test report of the spherical tank was still "qualified". Through analysis of the reasons, it can be known that during the heat treatment process, due to the deterioration of weather, the thermal insulation cotton layer was blown open and failed under the influence of strong winds, and the fixation treatment was not carried out in time; from the above content, it can be known that the test results of the present invention are consistent with the re-inspection results, and its accuracy is better than the results of the current laboratory mechanical property test report; in view of the above problems, after the joint meeting of the builder, the supervisor, and the construction party, considering that the actual excess of the spherical tank is not much, and the procedures have met the national standards, the risk of re-heat treatment twice is relatively large, so the builder finally agreed to the construction party's concession acceptance request.

[0104] Heat treatment refers to the process of heating solid metal materials to the required temperature at a certain speed, holding for a certain time to obtain a uniform austenite structure and composition, and achieving grain growth, followed by cooling. The essence of the above heat treatment process is to improve the processing and service performance of steel materials during heating and cooling, give full play to the potential of the materials, so as to improve the mechanical properties, product quality of steel parts and extend the service life of parts; specifically in the present invention, the most important thing through heat treatment is to improve its mechanical properties, and laboratory testing is also carried out by testing the mechanical properties of specimens; in the actual process, the laboratory cannot comprehensively test the mechanical properties of the entire tank body, while the specimens are in the position with the best heat treatment effect (at the top of the spherical tank); based on this, the current laboratory testing of mechanical properties has defects such as long testing time, limitations in testing resulting in low accuracy of testing results; the present invention realizes the detection of heat treatment results by detecting the temperature during the heat treatment process, changes the ex post detection to in-process detection, and can be timely discovered and remedied when problems occur, so as to achieve the characteristics of improving the qualification rate of heat treatment of spherical storage tanks and high detection accuracy.

[0105] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, terms such as "connection", "connection" and so on should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can also be the communication inside two components; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The above examples are only specific descriptions of the feasible implementation modes of the present invention, and they are not used to limit the protection scope of the present invention. All equivalent implementation modes, changes and modifications made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection method used in the heat treatment process of a spherical storage tank, characterized in that: This detection method is to use a temperature detection device to detect the external temperature of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process of the spherical storage tank; The number of temperature detections is at least two times. The first time is to measure the temperature at the midpoint of the heating process, and the second time is to measure the temperature during the period when the heating process ends and is about to enter or has already entered the heat preservation process; The first temperature measurement: When the measured temperature is within the ambient temperature to 100 °C, it is judged as qualified; when the temperature is not less than 100 °C, it is judged as unqualified; when it is judged as unqualified and the thermal insulation cotton strips are re-fixed, and the temperature after re-measurement is within 100 °C, it is judged as qualified; The second temperature measurement: After it is judged as qualified, the temperature inside the spherical storage tank (1) continues to rise, and the second temperature measurement is carried out. When the measured temperature is within the ambient temperature to 150 °C, it is judged as qualified; when the temperature is not less than 150 °C, it is judged as unqualified; when it is judged as unqualified and the thermal insulation cotton strips are re-fixed, and the temperature after re-measurement is within 150 °C, it is judged as qualified.

2. The detection method used in the heat treatment process of a spherical storage tank according to claim 1, characterized in that: The temperature detection device is an unmanned aerial vehicle thermal imaging device and an infrared camera, and the external part of the thermal insulation cotton layer of the spherical storage tank during the heat treatment process is detected without dead angle by the unmanned aerial vehicle thermal imaging device and the infrared camera.

3. The detection method used in the heat treatment process of a spherical storage tank according to claim 2, characterized in that: The unmanned aerial vehicle thermal imaging device detects the upper part temperature of the spherical storage tank, and the infrared camera is used to detect the lower part temperature of the spherical storage tank.

4. The detection method used in the heat treatment process of a spherical storage tank according to claim 1, characterized in that: The two temperature measurements are respectively: the first temperature measurement is carried out when the temperature inside the spherical storage tank is 200 - 300 °C; the second temperature measurement is carried out when the temperature inside the spherical storage tank is 575 °C - 625 °C.

5. The detection method used in the heat treatment process of a spherical storage tank according to any one of claims 1 - 4, characterized in that: This detection method includes the following steps: Step 1: Place the ignition device (2) at the bottom of the spherical storage tank (1), and the top of the spherical storage tank (1) is the smoke exhaust port (3); Step 2: Wrap a double-layer thermal insulation cotton layer (4) on the outer surface of the spherical storage tank (1). Each layer of thermal insulation cotton layer contains several thermal insulation cotton strips. The joints of the thermal insulation cotton strips in the same layer are fixed with steel wires and the expansion amount of the spherical storage tank (1) is reserved; Step 3: Use the ignition device (2) to heat the inside of the spherical storage tank (1) by combustion to achieve the temperature rise of the spherical storage tank (1), and control the heating rate according to the national standard GB50094 - 2010 specification; Step 4: When the temperature inside the spherical storage tank (1) is 200 - 300 °C, use a drone thermal imaging device to detect the temperature of the upper part of the spherical storage tank (1), and use an infrared camera to detect the temperature of the lower part of the spherical storage tank (1); when the temperature measured above is within the ambient temperature to 100 °C, it is judged as qualified; when the temperature is not less than 100 °C, it is judged as unqualified, which proves that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip; Step 5: When it is judged as unqualified in Step 4 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank through the drone thermal imaging device and the infrared camera. When the temperature after re-measurement is within 100 °C, it is judged as qualified; Step 6: When it is judged as qualified in the above Step 4 or Step 5, continue to heat up the inside of the spherical storage tank (1). When the inside of the spherical storage tank (1) heats up to 575 °C - 625 °C, the drone thermal imaging device and the infrared camera perform a second temperature measurement on the outer surface of the spherical storage tank (1); when the temperature measured above is within the ambient temperature to 150 °C, it is judged as qualified; when the temperature is not less than 150 °C, it is judged as unqualified, which proves that the thermal insulation cotton strip here fails, and organize on-site personnel to re-fix the thermal insulation cotton strip; Step 7: When it is judged as unqualified in Step 6 and the thermal insulation cotton strip is re-fixed, re-detect the temperature of the spherical storage tank (1) through the drone thermal imaging device and the infrared camera. When the measured temperature is within 150 °C, it is judged as qualified; Step 8: When it is judged as qualified in the above Step 6 or Step 7, perform constant temperature and cooling treatment on the spherical storage tank (1) according to the national standard GB50094 - 2010 specification.

6. A detection method used in the heat treatment process of a spherical storage tank according to claim 5, characterized in that: The volume of the spherical storage tank (1) is 50 - 5000 cubic meters.

7. A detection method used in the heat treatment process of a spherical storage tank according to claim 5, characterized in that: In the double-layer thermal insulation cotton layer (4) in Step 2, the joints of several thermal insulation cotton strips in the same layer are not on the same straight line, and the joints of the outer thermal insulation cotton strips and the corresponding joints of the inner thermal insulation cotton strips are not on the same straight line.

8. A detection method used in the heat treatment process of a spherical storage tank according to claim 5, characterized in that: A thermocouple thermometer (5) is provided on the outer surface of the spherical storage tank (1).

9. A detection method used in the heat treatment process of a spherical storage tank according to claim 5, characterized in that: Re-inspect the hardness of the spherical storage tank (1) after the constant temperature and cooling treatment in Step 8; the re-inspection tool is a Leeb hardness tester; the re-inspection steps include removing the thermal insulation cotton on the outer surface of the spherical storage tank (1), and after removal, manually use the Leeb hardness tester to detect the hardness of the top, bottom, middle, upper and lower parts of the outer surface of the spherical storage tank (1) respectively; randomly select at least two hardness detection points on the top and bottom of the outer surface of the spherical storage tank (1), and randomly select at least four hardness detection points on the middle, upper and lower parts of the outer surface of the spherical storage tank (1); If the Brinell hardness measured at the above hardness test points is 130 - 200, the reinspection is qualified.

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