Scaling problem in calcium chloride reboilers
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1. The calcium chloride mother liquor is produced by saponifying a Ca(OH)2 solution made from lime; the organic content in this mother liquor is approximately 30,000 ppm. 2. The mother liquor concentration fluctuates between 10% and 14%. 3. The calcium chloride mother liquor is processed using a three-effect counter-current evaporation system to increase its concentration to around 40%. The heat exchange tubes of the evaporator are made of titanium, with a thickness of approximately 1.2~1.5 mm. 4. After operating for about 2 months, the heat exchange efficiency of the evaporator’s heat exchange tubes began to decline, with a scale layer of approximately 2 mm. 5. The scale layer is dense, and it is very difficult to remove even with a 1,500-kilogram high-pressure water gun. What are some effective ways to remove scale?
The rising-film type is prone to clogging, so it needs to be changed to a forced-circulation type.
The cleaning effectiveness of a high-pressure water gun is not determined by pressure alone, but by the combination of pressure and flow rate, along with the use of an appropriate nozzle.
This isn’t difficult. In the past, we used graphite heat exchangers, with calcium chloride as the medium at a concentration of around 40%. When clogging occurs, it’s best to use steam, as it can be used to blow out the blockage; calcium chloride solidifies quite quickly. It’s also okay to add water, but after adding it, heating must be applied to produce steam, which will help it dissolve quickly as well. Hope this is useful to you
Our company specializes in solving the challenges associated with the chemical cleaning of calcium sulfate composite scale
The use of scale inhibitors can delay cleaning to every 6 months; there are successful cases of this approach