Repair scheme and effect evaluation of the attenuation of tray efficiency after long-term operation of paraffin absorption tower
Release Time : 2025-04-16
In chemical production, paraffin absorption tower is a key equipment. After long-term operation, the efficiency of the tower plate will inevitably decline. Only by deeply analyzing the reasons for its decline can a targeted and effective repair plan be formulated. The decline of tower plate efficiency mainly comes from multiple aspects. On the one hand, paraffin and its impurities are continuously deposited on the tower plate, blocking the gas-liquid channel, resulting in a reduction in the gas-liquid mass transfer area and a decrease in the mass transfer efficiency; on the other hand, during long-term operation, the scouring of the gas-liquid two-phase in the tower and the fluctuation of temperature and pressure cause the tower plate components to wear and deform, destroying the structural integrity of the tower plate, thereby affecting the gas-liquid contact and mass transfer effect; in addition, the corrosion in the tower, whether chemical corrosion or electrochemical corrosion, will damage the tower plate material and reduce the performance of the tower plate.
In view of the above reasons, a comprehensive repair plan is formulated. First, the paraffin absorption tower plate is thoroughly cleaned. A combination of chemical cleaning and mechanical cleaning is adopted, and a suitable cleaning agent is selected to dissolve and remove the paraffin deposits and impurities on the tower plate through soaking, circulating flushing and other means. For stubborn dirt, mechanical cleaning methods such as high-pressure water jets are used to treat it to ensure that the gas-liquid channel is unobstructed. Secondly, the structure of the tower plate is inspected and repaired. Check the key parameters of the tower plate such as flatness, weir height, and downcomer size in detail. For deformed and worn tower plate parts, use correction, repair welding, replacement, etc. to repair. At the same time, the supporting structure of the tower plate is reinforced to enhance the stability of the tower plate and prevent deformation from occurring again during operation. Furthermore, in order to improve the corrosion resistance of the tower plate, the surface of the tower plate is treated with anti-corrosion. According to the characteristics of the medium in the tower, select suitable anti-corrosion coating materials, such as corrosion-resistant coatings, metal plating, etc., and form a protective film on the surface of the tower plate through spraying, electroplating and other processes, which effectively isolates the contact between the medium in the tower and the tower plate material and slows down the corrosion rate.
After the implementation of the repair plan, its effect needs to be scientifically and reasonably evaluated. In terms of process performance, by monitoring the gas-liquid flow, temperature, pressure and other parameters in the tower, calculating the mass transfer efficiency, separation effect and other indicators of the tower plate, and comparing them with the data before repair, the improvement effect of the repair scheme on the tower plate efficiency is intuitively reflected. At the same time, observe the changes in product quality, such as the purity and impurity content of paraffin, and evaluate the improvement of production quality by the repair scheme. In terms of equipment performance, check the structural stability of the tower plate, measure the dimensional accuracy of the tower plate components, and judge whether the repaired tower plate meets the requirements of long-term stable operation. In addition, the operation cycle and maintenance frequency of the tower plate after repair are statistically compared with those before repair to evaluate the impact of the repair scheme on equipment reliability and maintenance cost.
Through the implementation and effect evaluation of the above repair scheme, the problem of tower plate efficiency attenuation after long-term operation of paraffin absorption tower can be effectively solved. It can not only improve the mass transfer efficiency and separation effect of the tower plate and ensure production quality, but also enhance the reliability of the equipment, reduce maintenance costs, and extend the service life of the equipment, providing strong guarantee for the stable and efficient operation of chemical production. In practical applications, the repair scheme should be appropriately adjusted and optimized according to the specific operating conditions and test results to ensure that the repair effect reaches the best state.