Semi-water gas is desulfurized using a wet method, and shift gas is also desulfurized with a wet method; in both cases tannin is used for desulfurization. Can the same circulation tank be used for both?

It is best not to use a looped channel steel. Desulfurization of semi-water gas requires that the concentration after desulfurization be less than 100 milligrams per liter; the hydrogen sulfide content in semi-water gas is generally above 1 gram per liter ； The hydrogen sulfide level before desorption is generally around 150 milligrams per liter, while it is around 10 milligrams per liter after desorption. In other words, semi-desulfurization is a rough form of desulfurization, while advanced desulfurization is a more precise form of it; the regeneration liquid used in advanced desulfurization is cleaner than that used in semi-desulfurization, with a lower concentration of hydrogen sulfide ions in the liquid. By sharing a single circulation tank, the ability to change the state of separation is weakened, and the goal of achieving state change in separation cannot be achieved.

Agree with the second-floor view. When change management was first applied in enterprises in the early 1990s, some used the same recycling system, but most changed to different systems later on. It’s better to keep them completely separate.

Agree with the idea of not sharing one regeneration tank on the second floor； One more point to add is that, due to the high carbon dioxide content in the desulfurization system, the degassed rich liquid and lean liquid contain much higher levels of sodium bicarbonate as a by-product. The conditions required for regeneration, such as pressure and injectors, also differ between these two types of liquids. Therefore, depending on the required precision of desulfurization, it is not appropriate to use the same regeneration system for both types of desulfurization liquids.

The process parameters for desulfurization and modified desulfurization are not identical, so they should not be used together

The devolatilization and semi-devolatilization solutions cannot share the same circulation tank: 1. The compositions of the solutions are different; generally, devolatilization is more difficult due to the high carbon dioxide partial pressure, and a higher total alkalinity is required in this process； 2. The semi-depleted solution is dirtier compared to the fully depleted solution, and using the same circulation tank can lead to contamination of the fully depleted solution.

Apart from the different sulfur content in the refined distillate, does pressure have any effect? The pressure in the refined distillation column is much higher after the change; it should have some impact as well, right?

The composition of the gas after partial desulfurization differs from that after complete desulfurization; the pressure in the desulfurization tower is also different, as are the requirements regarding hydrogen sulfide levels at the outlet. Using the same solution can have an impact on each other. The raw gas used for partial desulfurization contains many impurities, has a high level of by-products, and its lean liquid has a high content of suspended sulfur. Variable stripping and semi-stripping also have different controls over the regeneration temperature; therefore, they cannot share the same circulation tank.

Under normal production conditions, it is best not to mix the desulfurization fluids from the two processes. Different operating environments and varying requirements for desulfurization precision can affect the efficiency of desulfurization.

I don’t think it’s appropriate, because the H2S content in the two gases differs greatly! Also, the indicators for semi-degradation and degradation are different too! Our factory areas are separated!