Questions in sulfur recovery (V)

Burning acid-containing gas is the biggest challenge in the operation of sulfur production furnaces, especially during the startup phase, when the flow rate of clean acid gas fluctuates. If the ratio of acid-containing gas to clean acid gas exceeds the tolerance range of the ammonia burning nozzles, incomplete combustion of ammonia may occur, which could lead to blockages in the system. Countermeasure: During the startup phase, strictly control the ratio of aminoacid-containing gas to clean acidic gas flow rates, pay attention to changes in furnace temperature, and if necessary, consider diverting the aminoacid-containing gas to the flare system. It is recommended that, when the flow rate of acidic gas during cleaning is unstable, the use of aminoacid-containing acidic gas for combustion should be avoided. 11.6.3.2 Due to the main burner of the furnace, during the initial stage of heating, the temperature may not conform to the furnace drying curve, especially at temperatures below 200°C. Countermeasure: Use an open-flame lamp to heat the sulfur production furnace below 300°C, and strictly control the valve opening degree of the fuel gas in the exhaust gas furnace below 300°C. 11.6.3.3 At the beginning of operation, fluctuations in acidic gas levels and phenomena such as solvent regeneration surging may occur. Countermeasures: (1) Monitor the air distribution in a timely manner; if the fluctuations in acidic gas exceed the operational tolerance, considering venting the acidic gas to a flare and keeping the sulfur production furnace in standby mode is advisable. (2) When acidic gas levels fluctuate and the air supply cannot keep up, attention should be paid to SO2 leakage in the quench tower of the exhaust gas system; if necessary, it may be considered to direct the sulfur-producing exhaust gases directly to the exhaust gas furnace. (3) To prevent SO2 penetration in the quench tower, the air-fuel ratio in the sulfur production furnace can be controlled at 2.5 to 1, and the hydrogen content in the exhaust gas treatment section can be kept at 5%.

Thank you so much to the guy upstairs for providing more information on sulfur recovery! The more, the better! ! !

The amount of acid gas is a major uncontrollable factor, and its fluctuations have a significant impact on operations. Acidic gases containing a high amount of hydrocarbons can often cause the color of sulfur to deteriorate; we have experienced incidents in which sulfur turned black due to the high content of hydrocarbons.

Control of pH value in the quench tower, hydrogen flow rate for hydrogenation, and tail furnace temperature

1. The amount of hydrogen used in hydrogenation directly affects whether the quench tower will become clogged; in fact, it is closely related to the air distribution as mentioned earlier – air distribution is the key factor. 2. The temperature of the exhaust gas combustion furnace: pay attention to changes in the furnace temperature. The amount of hydrogen in the exhaust gases, as well as the level of gas, directly affect the furnace temperature. It is necessary to prevent overheating to avoid damage to the equipment. These are just some of my experiences; the original poster can take them as a reference. I hope they will be useful to you.

A lower temperature in the exhaust gas burning furnace could also lead to water accumulation in the exhaust gas flue