Purified gas/non-purified gas/online total sulfur reduction not decreasing
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The total sulfur content in both the purified gas and the unpurified gas fails to decrease. (The levels of lean methanol and semi-lean methanol are all within normal ranges; the thermal regeneration temperature is normal. The inlet and outlet values of the lean/methanol heat exchangers are normal, as are those of the coil-type heat exchangers. There is a downward trend in the total nitrogen content of lean methanol.) The total sulfur content in the purified gas remains at high levels, at the full scale of measurement. The sulfur content at the inlet of the synthesis desulfurization tank in the subsequent system is identical to that at the outlet of the purification process, indicating the true value. I urge experts to help analyze the reasons for this!
The situation you mentioned seems to involve a desulfurization process using methanol as an absorbent. In this process, the total sulfur content in the gas may refer to the combined concentration of hydrogen sulfide (H2S) and other sulfides such as COS, CS2, etc. If the total online sulfur content in both the purified gas and the unpurified gas cannot be reduced, considering the conditions you have provided (low methanol levels, normal semi-low methanol levels) ； The thermal regeneration temperature is normal ； The inlet and outlet tests of the rich-poor methanol heat exchanger as well as the tube-winding heat exchanger are normal ； (The downward trend in total nitrogen content of lean methanol); possible reasons include, but are not limited to: 1. Decreased absorption efficiency: In the absorption tower, insufficient absorption efficiency may occur due to changes in operating conditions, damaged or clogged packing, or uneven distribution of liquid and gas. 2. Incomplete regeneration of the absorbent: Although the thermal regeneration temperature is normal, the regeneration of the absorbent may be incomplete due to operating time, the quality of the regenerating agent, or other unknown operational issues. 3. Increased sulfur content in the feed gas or the gas being introduced: It may be that the sulfur content of the feed gas or the gas flowing into certain parts of the system has increased abnormally. 4. Analysis instrument calibration issues: Sometimes, analysis instruments may experience calibration errors or abnormal readings, resulting in inaccurate test values. 5. Secondary pollution: There may be certain unknown sources of secondary pollution within the system, leading to the re-entry of sulfides into the airflow. 6. System leakage: There may be a leak somewhere in the system, allowing unpurified gas to enter the purification system. 7. Insufficient absorption agent circulation volume or uneven distribution: It may be necessary to check the operating condition of the absorption agent pump as well as its distribution throughout the absorption tower. To further diagnose the issue, you need to conduct a thorough inspection of the equipment and processes to ensure that all equipment is operating properly, and that operational parameters such as pressure, temperature, and flow rate meet the process requirements. At the same time, analytical instruments should be regularly inspected and calibrated to ensure their accuracy. If the problem persists, you may need a professional on-site technician to conduct a detailed inspection and analysis of the entire desulfurization system. .
This post was last edited by I’m an adult on 2023-12-11 at 11:32. Are you considering switching to poor-quality methanol?