The chlorine inlet of the pest control tower often crystallizes
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This post was last edited by sunjl1981 on 2013-1-6 at 22:53. A problem that occurs frequently and is hard to understand is the formation of salt crystals at the connection point where chlorine enters the decontamination tower. According to a friend, this might be caused by excessively high operating temperatures or a high concentration of caustic soda solution; however, since these two parameters are currently within normal ranges, this issue still persists. Is there any effective way to solve it? # + + .
The heat generated by the reaction cannot be carried away; crystallization and salt formation occur when the temperature exceeds 60 degrees. The temperature of the circulating alkaline solution is usually between 22 and 26 degrees
1. The concentration of the alkali solution absorbed is too high； 2. Since Cl2 + 2NaOH = NaCl + NaClO + H2O + 25.31kcal/mol is an exothermic reaction, the heat generated by the reaction must be removed promptly. Otherwise, the temperature of the alkali solution being absorbed will rise, leading to the following side reaction: 3NaClO = NaClO3 + 2NaCl. The resulting crystals can cause blockages in pipes, heat exchangers, and liquid distributors.
Clean the tower regularly. And minimize air entering the deodorization tower.
Reply to 2# Zhang Zhu 1817339: It decomposes at 60 degrees; still waiting for crystallization
Reply 1# qingyuan*ushan: If you run into me, you’re lucky. I encountered this issue and it has been resolved. The temperature must not exceed 40 degrees; otherwise, sodium hypochlorite decomposes into chlorine gas and salt, which can cause problems. The concentration should not exceed 15%, otherwise salt crystals are likely to form. What are your values for these two indicators? You didn’t mention them
Reply 1# qingyuan*ushan: The solution is to rinse regularly with water, or run a cycle with mild alkali.
It might be due to operational issues; the liquid level rising could cause excess liquid to enter. A diagonal backflow stopper can be installed on the main chlorine inlet pipe, and flushing should be carried out during shutdown. A drain point should also be added at the lower part of the inlet pipe
Reply to 6# jin*angyu: We have kept these two indicators well under control
Not necessarily; check the facts carefully