Fluctuations caused by defoamers
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Our factory has a circulating hydrogen desulfurization tower used for desulfurizing materials. Poorly concentrated amine solution is fed into the top of the tower, while gas rich in H2S is fed in at the bottom. An antifoaming agent is added to the tower to prevent the amine solution from bubbling. Why does the addition of this antifoaming agent cause fluctuations in the temperature and pressure of the tower and the entire system? How can this problem be resolved? I would appreciate advice from experienced professionals
Just add the defoamer and desulfurizer together. A very small amount of defoamer is used.
Foam suppressants should not be used in excess. . . :lol
I heard for the first time that it can be added directly to the tower. Generally, manufacturers already include antifoam agents in desulfurization agents, so there is no need to add them separately. In special cases where an antifoam agent is required, it can be added to the tank, mixed well, and then poured into the tower.
Yes, our solvent regeneration system also doesn’t require the use of defoamers. However, there is a step in our process that involves defoamers; under normal operation, it’s sufficient to add the desulfurizing agent based on its concentration and the liquid level in the desulfurizing agent storage tank !
In the cyclic hydrogen desulfurization tower, an antifoaming agent is added to prevent the amine solution from foaming. Why does the addition of this antifoaming agent cause fluctuations in the temperature and pressure of the tower and the entire system each time? Because the defoamer contains silica gel, it adds weight to the amine solution; as a result, heat is carried to the bottom of the tower, which leads to a decrease in tower pressure and temperature fluctuations. To reduce fluctuations, do not add too much defoaming agent at each time.
Every time an antifoaming agent is added, it causes fluctuations in the temperature and pressure of the tower and the system. How is the defoamer added? If it is added by nitrogen purging, the duration of the nitrogen purging process should not be too long, and the amount of defoamer used should not be excessive. After the defoamer is added, foaming is eliminated, which results in an increase in the liquid layer on the trays or packing. The excess liquid reaches the bottom of the tower, causing changes in the tower’s temperature and pressure; this is a normal phenomenon.