Increased pressure of sulfur recovery in Claus process encountered in actual production
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When the pressure behind the furnace rises, in actual operation we usually do it slowly under the following conditions:: Give way! There are leaks in each weld of the liquid sulfur pipeline, and the heating steam enters the liquid sulfur pipeline, causing the system pressure to rise at a high speed.: The tubes of the waste boiler leak, and the boiler water enters the tube side, cooling the sulfur in the process gas, blocking the pipeline, causing poor process gas flow and high system pressure. This phenomenon is that the steam pressure on the shell side decreases, the temperature of the pipe after the waste boiler drops, and the system overpressure rises rapidly.: Our exhaust gas is sent to the boiler for further desulfurization. They have a negative pressure device and a control valve. We have encountered several emergencies. The valve on the boiler automatically closed, causing the sulfur recovery pressure to rise suddenly. The car stopped production. I have been exposed to sulfur recovery for less than two years. From the initial start-up to formal production, I encountered various blockages and leaks. Basically, it took three to five days for minor repairs and half a month for major repairs. I have always felt that the process of sulfur recovery is simple, but the situation is complicated, so I still need to learn more. * I hope the above is useful to everyone, and I hope everyone can communicate more.
What you are describing is abnormal. The sulfur recovery device should be operated for at least one year, and a good device can be operated for 3 years. Minor repairs in three to five days and major repairs in half a month may be due to design reasons or management reasons.
The leakage points mentioned above are all at the welding seams between the tube side and shell side of the waste boiler, as well as at the flange welding position where the inner and outer pipes of the heating jacket are welded. Without exception, the official explanation of the equipment manufacturer is that the leakage is caused by corrosion of the welds. We can only laugh at this and ask seniors to tell us what is causing this.
For sulfur recovery, there are four causes of corrosion: High temperature corrosion, dew point corrosion, acid corrosion and stress corrosion. If it is at the junction between the tube side of the waste boiler and the tube sheet, it is stress corrosion. The designed expansion amount is insufficient. When the temperature changes, there is stress in the tubes and the tube sheet and the tubes are broken. It is recommended to add an expansion joint on the shell side of the waste boiler and sulfur cooler to solve this problem.