In petrochemical enterprises, many reactor pressure vessels work under high temperature and high pressure conditions. In order to protect the pressure vessel shell from the corrosion of the internal working medium at high temperature, anti-corrosion and heat insulation lining materials are often added inside the high-temperature pressure vessel. However, these linings are scoured by high-temperature, high-pressure, and high-speed flowing media for a long time during the production process, and are easily damaged. If the lining has bulges, cracks, hollowing out, falling off, etc., on the one hand, the medium can directly corrode the wall of the pressure vessel; deformed, tilted or even collapsed. Using infrared thermal imaging camera detection technology to carry out online detection of pressure vessels during the operation of pressure vessels can detect damage to the lining early, take remedial measures in time, and eliminate potential safety hazards in the production process.
High-temperature pressure pipelines are widely used in petrochemical plants and power stations, and leakage and explosion accidents often occur. The main factors that cause pressure pipeline leakage and explosion accidents include corrosion, medium erosion, welding defect cracking in welds, stress corrosion cracking, material deterioration, and valve rupture. A large number of accident statistics show that corrosion and medium erosion are the main causes of pressure pipeline leakage and explosion accidents, accounting for about 50% of the total accidents. Therefore, it is an important means to ensure the safe operation of pressure pipelines by using effective non-destructive testing methods to timely discover local wall thickness reduction defects caused by corrosion and erosion on the base metal of pressure pipelines, and to replace these pipelines. X (or γ) ray, ultrasonic and infrared thermal imaging detection technologies are all suitable for the detection of pressure pipe wall thickness reduction, and online thermal imaging detection has the advantages of non-contact, fast area scanning and no harm to people. It has potential in online detection of corrosion pits and wall thickness reduction defects in high temperature pressure pipelines.
The regenerator is the core equipment in the catalytic cracking unit of the refinery, and the catalytic cracking unit occupies a very important position in the refining process. In the catalytic cracking unit, the regenerator is used to regenerate the coke of the catalyst, which is the key equipment to ensure continuous production. The quality of its operation is directly related to the economic benefits of the enterprise. The working conditions of the regenerator are extremely harsh. Its lining has to withstand the high temperature of 700 ° C and the erosion of high-speed flowing medium. Therefore, in the process of catalyst regeneration, the lining is the first to be damaged in the regenerator. The damage of the lining will affect the long-term operation of the device. would pose a direct threat. The survey shows that it is one of the main reasons for the shutdown of equipment, so the state of the lining is an important indicator of the operating state of the regenerator.
Due to the effects of infrared cold emission (IRCE) and infrared heat emission (IRHE) during the fatigue compression process of metal pressure vessels, there are obvious changes in infrared emission energy in the stress concentration area. After a certain period, the fatigue damage zone will produce an irreversible temperature increase.
The results of fatigue damage of multiple metal pressure vessels prove that there are always hot spots in the fatigue damaged area of the pressure vessel under the working pressure condition. The shape and track of the hot spots are different with the expansion of fatigue cracks. Changes, but the exact position of the fatigue damage area marked by it does not change, especially in the heat spot pattern in the later stage of fatigue damage, the direction and size of the crack can be clearly seen. Fracture analysis of the fatigue leakage area proves that the thermal elastic stress infrared image is correct for the early detection of heat spots in the fatigue damage area.
Since the online thermal imager inspection must be carried out during the loading process, the LPG storage tank must be subjected to a loading test during the inspection. The state before loading is empty, and the infrared thermal imager is used to scan the tank before loading to find out what is easy to produce. Whether there is temperature inconsistency in the area of stress concentration, follow up and observe these parts during the loading process, record the temperature change of stress concentration, test results and analysis.
Before loading, scan the empty tank with an infrared thermal imager to find out whether there are parts with uneven temperature. During the loading period, it is gradually found that the temperature of two weld parts on one head of the storage tank is higher than the temperature of the base metal. Therefore, track and monitor this part.
