Repair of cracks in low-pressure methanol synthesis tower
Thread Content
Our company has three sets of methanol production lines with an annual output of 100,000 tons. Among them, the methanol synthesis tower (5.5MPA, diameter 3000, by-product steam) has leaked many times. Currently, pressure plugging is used to maintain production. Is there any manufacturer or organization that specializes in solving such problems? Is there any technology to solve this problem? QQ ； 467853036
The methanol synthesis tower should be a Category III pressure vessel. In which parts have cracks appeared many times? We also use pressure plugging to maintain production! No matter what the cause is when it occurs for the first time, you have to find the equipment manufacturer to help cure it! This kind of problem is not a difficult problem, it is just a major safety hazard that must be stopped quickly. Safety comes first!
The circumferential welds outside the downtube are most densely exposed. When the leakage first occurred, the car was stopped for inspection. The manufacturer also came several times, but it could not be cured. It has been leaked dozens of times now, and many people are numb, but they cannot stop. If it stops, the production cost of the entire factory will go up, and more than 200 people will have no work. What a rush!
Wangyue Pavilion, like you, we are doing it for the fourth time, and we are currently parking the car for welding. What is the reason for your analysis? Which factory is it made by? Is the quality of your desalinated water good?
There is no problem with our desalinated water. It has been treated by reverse osmosis, and all indicators are within the range. Our tower is a squat type methanol synthesis tower, manufactured by Xi'an Nuclear Equipment Plant. After cracks appeared, we came to repair it several times, but it was not completely solved. There is currently no clear explanation.
The key during treatment is to handle the heat treatment of the weld well and use special heat treatment tools!::o
What the poster described is probably a shell-and-tube methanol reactor. Shell cracks in this type of equipment are inherent deficiencies. Because the structure determines its results, the equipment does not consider the damage of thermal stress well and does not provide enough space to release the thermal stress of the tube-side heat exchange tubes. This problem can be solved by increasing the baffle spacing and reducing the tube bundle rigidity. However, increasing the baffle spacing will have an impact on the heat transfer and heat exchange efficiency of the water flow. Thermal deformation (distortion) of the heat exchange tubes may cause difficulty in the unloading of the catalyst. In addition, most of the cracks that appear in this equipment are fatigue cracks and are difficult to repair. Therefore, it is recommended to choose other domestic tower types. This post was last edited by hhhxh5712 on 2008-9-15 15:55 ]