Secondary Claus reactor inlet crossover line

The idea is very good. Generally, most of the reactions are concentrated in one stage, and part of the gas is introduced to the second stage to reduce the load on one stage.

The plan to set up a cross-line at the inlet of the two-stage Claus reactor has long been available. It is mainly used to heat up the second-stage reactor when it is started. In addition, it can also help increase the temperature when the temperature of the second-stage reactor is low.

If it is found that the temperature of the primary reactor is abnormal, can reducing the reaction gas volume at the inlet of the primary reactor be used as a means of temperature adjustment?

This kind of cross-line exists in many sulfur recovery devices, and its function is to use it when the secondary reaction temperature rises during startup.

The primary and secondary converter inlets of the sulfur recovery device designed by Sanwei Institute have crossover lines. Their main function is to increase the temperature of the reactor first by one revolution and then by two revolutions when starting operation.

Yes, sir, the second revolution regenerates the first revolution to prevent water vapor from entering the second revolution. When the temperature of the second revolution is higher than 300 degrees, there is no need to worry.

Our sulfur recovery is three-dimensionally designed, using a high-temperature blending valve and a crossover line, mainly for heating up the second stage.

What the person above said is right, it is mainly used to heat up the second revolution. During normal operation, if the regulating valve of the first- and second-conversion heat exchangers cannot increase the inlet temperature of the second-conversion heat exchanger, use the cross-line opening to adjust it. The disadvantage is that it is easy to cause poor reaction in the second-turn bed and affect the operation of the exhaust gas furnace.

Can the person on the 7th floor explain it in more detail? Why upgrade to second rank first? What are the disadvantages of bringing in water vapor? Bonus points for replying!

The three-dimensional craftsmanship is so thoughtful 1

Water vapor has a certain impact on the structural stability and activity stability of the catalyst. Water vapor and alumina can react chemically to form hydrates, which destroy the small pores and reduce the specific surface area of ​​the catalyst, resulting in a reduction in catalyst strength and activity.

Then water vapor is also generated during normal reactions, and when the bed temperature is high, cooling steam is introduced to cool down. Isn't it difficult to use the catalyst at these times? Isn't there a cocatalyst added to the catalyst to enhance its resistance to water vapor? I think the impact of steam on the catalyst should not matter unless there is a lot of steam and the bed temperature is very high. For the first two revolutions, is it considered that the temperature rises quickly? By raising the temperature of the second revolution first, and then raising the temperature of the first revolution, you can ignore the possible liquid entrainment caused by the heat loss of the hot air flow passing through the pipe in the first revolution. If you want to raise the temperature first, you have to consider the heating rate of the second rotation, because the hot air flow may contain water, and the heating rate has to be slowed down. This is purely my personal opinion, please correct me!