Let’s talk about the control of integrated drying towers
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Integrated drying towers are currently used by many companies in the industry; could everyone share their requirements regarding control? 1. What should be the temperature of the packing layer? 2. What is the temperature of the blister layer? 3. Is the tower insulated? 4, and so on.........
1. Temperature of the packing layer: 12–14°C. 2. Temperature of the bubble cap layer: 12°C when acid is introduced, and between 12–14°C after chlorine is released. 3. Insulation of the tower: No insulation measures have been taken. 4. The biggest flaw is the absence of sight glasses. It’s not possible to see the acidity level of the bathing solution.
Reply to 2# 181128425: Mirrors cannot be used, as they will create additional points of leakage and affect the purity of chlorine as well as its water content. The temperature of the packing layer is to be controlled at 8-10 degrees.
Reply to 3# yzhms: Why is it necessary to keep it between 8-10 degrees? Below 9.6 degrees, don’t chlorine and water form CL.8H2O crystals? Is it because of the presence of sulfuric acid inside the tower that these crystals do not form?
It is controlled at 8-10 degrees, but the temperature coming out is not just 10 degrees. In our case, the temperature of the filler layer is kept around 12 degrees, and the temperature coming out generally does not exceed 18 degrees; the results are quite good
Reply to 4# Junyi: It is formed in chlorinated water, but there is little moisture present in liquid form inside the drying tower, so no crystals of chlorinated water will form.
It is necessary to control the temperature of sulfuric acid between 12 and 14; the key factor is the water removal efficiency of the packing layer and the bubble cap layer. Furthermore, to reduce heat loss, it is also necessary to adopt an insulated design for the tower.
Reply to 3# yzhms: Last winter, we raised the acid inlet temperature of the bubble column to 8°C, and the results seemed good; however, it was adjusted back after a few days of operation. Regarding the packing section, I believe that our operating procedures as well as the equipment are suitable. It’s not done now mainly because sulfuric acid is too cheap... No one really cares about using a bit more of it...
Resources still need to be conserved, hehe.
In response to question 9# yzhms regarding chlorine drying, I originally intended to make some adjustments, but I have been too busy and haven’t had the time to optimize the process yet. Currently, the water content in our chlorine is around 100 ppm, the amount of concentrated sulfuric acid used per ton of alkali (on a percentage basis) is less than 15 Kg, and the acid concentration coming out of the bubble column is above 97%. If we were to adjust the process parameters, it’s feasible to maintain a temperature of 8°C； But in our technically conservative department, I’m too lazy to prepare the reports that are required; I’ll deal with them when I have time later. For now, I need to figure out the energy consumption of various devices in the workshop, as well as the emission reduction measures...**Please give me some guidance. Thank you!
Our factory currently uses tray dryers with four layers, and each layer is equipped with monitoring devices. We control the temperature of the chlorine gas entering the dryer, keeping it between 12 and 15 degrees; however, we do not control the temperature of the sulfuric acid fed into the dryer. In summer, about 1 ton of sulfuric acid is consumed per shift – is that an excessive amount? Is there a solution?