What is the timing for injecting stripping steam into the hydrogen sulfide removal stripper?

When operating the stripping tower with stripping steam, we generally introduce the steam once the liquid level in the tower top reflux drum begins to rise. The timing and amount of corrosion inhibitor injection are determined based on the iron ion content in the water layer of the top reflux tank.

When operating the stripping tower with stripping steam, we generally introduce the steam once the liquid level in the tower top reflux drum begins to rise. The timing and amount of corrosion inhibitor injection are determined based on the iron ion content in the water layer of the top reflux tank.

1. When injecting steam, the partial pressure generally decreases after the steam enters the tower. It is important to monitor the feed temperature of the tower; it must be above the saturation temperature of the steam to prevent the steam from condensing into water, which could then enter the subsequent distillation tower and cause fluctuations in the liquid level and pressure there. Generally, steam injection should occur at a temperature above 180°C; if the temperature cannot be raised that high, 170°C is an acceptable alternative. However, the bottom temperature of the subsequent tower must be high, otherwise the bottom pump is prone to drawing in water and causing cavitation. It is also important to ensure that the tower pressure does not exceed safe levels. 2. Theoretically, the corrosion inhibitor should be added before introducing gas, in order to form a protective layer that prevents corrosion. However, if things are too busy at the time of startup, the inhibitor can be added after things have stabilized; short-term corrosion will not cause any problems. It is important to prioritize stability during startup. It was helpful to you in the past.

The fact that there is a liquid level in the reflux tank also indicates that the tower temperature has risen, right?

Even when no steam is injected, the reflux tank still has a liquid level; this level is caused by the components at the top of the tower reaching their bubble point at the temperature there, and then being cooled down by the cold air and water following vaporization and mass transfer. This is unrelated to the injection of steam. However, after steam is injected, a liquid level does appear

It depends on whether it’s medium pressure or low pressure; for medium pressure, the temperature in the tower usually exceeds 200 degrees, while for low pressure, operation starts at around 100 degrees

Corrosion inhibitors are added when the top temperature of the tower rises and there is a change in the liquid level in the reflux tank; it doesn’t matter if they are added a bit earlier or later