Filler for desulfurization using tannin method

The polypropylene flat ring type QH-1 with dimensions Φ76×26×2.5 used in our plant is capable of processing 80,000 cubic meters of gas per hour. As a result of the hydrogen sulfide concentration dropping from 500–700 milligrams to 120 milligrams, there have been no instances of tower blockage or high resistance over the years of operation. Moreover, it is easy to clean this component during maintenance – washing is sufficient, and the results are quite satisfactory

If it is a three-layer packing, it is best to use φ100×100 for the lower layer, and φ76×76 for the middle and upper layers. Since the most sulfur accumulates in the lower part, using larger-sized packing in the lower layer can help delay tower blockage more effectively.

Our plant’s desulfurization tower consists of two sections, upper and lower; originally, both sections used Φ76×76 polypropylene rings, but later the rings in the lower section were replaced with larger Φ100×100 rings, with the packing being in a loose pile format.

The choice of packing depends mainly on your hydrogen sulfide content and total gas volume, as well as on how many layers of packing you decide to use. Our plant’s capacity has been reduced from 4,000 to 5; 3-layer polypropylene Pall rings are used. The volume of semi-water gas produced is 80,000 cubic meters per hour. It is easy to clean these rings during maintenance – washing them is sufficient, and the results are quite satisfactory.

I’ve seen one type that is a polystyrene ring, with dimensions of approximately Φ83×83, and it comes in a loose pile……

Application of polypropylene Pall rings in the tannin-based desulfurization process: A certain plant uses the tannin-based method for desulfurization. In a desulfurization tower with a tower diameter of Φ6000 mm, Dg76 polypropylene Pall ring packing is used, with a packing layer height of 3.5 m, to replace the originally designed wooden grid packing. Production experience shows that polypropylene Pall ring packing has advantages such as low resistance, corrosion resistance, durability, resistance to tower clogging, and high desulfurization efficiency. This tower has been using this type of packing for 6 years, with production remaining stable and normal. Using this type of filler in place of wooden grid fillers not only saves a large amount of wood, but also reduces maintenance time by 4/5, **alleviating the workload. The selection of packing must take into account factors such as production capacity, efficiency, operational flexibility, cost, and pressure drop, as well as the corrosiveness of the material. The following factors need to be considered: the material used for the filler – it should first be determined based on the corrosiveness of the material being processed and the operating temperature. Size of the packing: There is a minimum value for the appropriate ratio between the tower diameter and the outer diameter of the packing; when this ratio is below that value, it becomes difficult to predict their performance. Throughput capacity of the packing: The ultimate throughput capacity of the packing corresponds to the gas velocity in the empty tower at the flooding point. Efficiency of the packing: The factors affecting efficiency are quite complex, so it is more reliable to base design on measured values. Pressure drop across the packing: The power consumption of a packed tower depends mainly on the total pressure drop in the gas phase throughout the tower. This post was last edited by Chuangxin Filler on 2009-4-3 at 13:45.]

We use polypropylene stepped rings, which have been in use since the factory was established; they work very well, even when loaded in a haphazard manner.

We use lightweight porcelain filler, which is great.

Surely, a loose pile gives better results, as it provides a much larger contact area

Use a Bower ring in a random stacking manner. It just depends on the amount of H2S gas you have

Look at the amount of air available, and consider the economic aspects as well. 】 In fact, these various fillers have more or less the same effect.

This post was last edited by Fengye Hong on 2009-5-30 at 20:28. We use polypropylene stepped rings with a diameter of 76; the results are excellent. They are filled in four layers, in a random stacking manner.

Based on the characteristics of tannin desulfurization itself, large-sized bulk packing should be used as the packing in the desulfurization tower.

Design calculations are carried out based on specific conditions; typically, under fixed parameters such as the gas treatment volume, solution circulation rate, hydrogen sulfide content in the gas, and properties of the desulfurization solution, the specific surface area of the material affects the diameter of the tower. Once this is determined, the total gas-liquid mass transfer area required is calculated, and finally the height of the tower is determined.

We also use polypropylene stepped rings, which work well; they are packed in a random manner.

I’m working on a graduation project in this area~~ I don’t really understand it well~~