Chlorine main pipe nitrogen trichloride problem
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This post was last edited by sunjl1981 on 2013-1-6 22:06. The content of nitrogen trichloride in the chlorine main pipe was analyzed to reach 28ug/g. How should it be treated to prevent the accumulation of nitrogen trichloride? # hcbbs
There is so much nitrogen trichloride in the main pipe, which proves that the ammonia nitrogen compounds in the brine are not well removed. The cause should be found and dealt with in the brine process. Pay attention to the enrichment of this substance in the liquid chlorine process, discharge sewage in time, and strengthen monitoring.
1. Salt water strengthens total ammonia control； 2. Chlorine main pipe diversion and discharge ； 3. Closely track the liquefaction behind.
a Ensure the ammonium content of the original salt, b Clear the chlorine pipeline and reduce U-shaped bends c Chlorine liquefaction is tracked every day d Liquid chlorine has multiple rows of nitrogen trichloride
For this problem: 1. Segmented analysis, step by step analysis from raw salt, primary brine, secondary refining into tank brine, recovery of brine, and find the source of ammonium 2 When the primary dehydration salt enters the front reaction tank, make sure to add NaClO under alkaline conditions. Analyze whether there is free chlorine in the water coming out of the floating barrel. Be sure to ensure that there is excess. Finally, add enough sodium sulfite before refining. At the same time, it is necessary to strengthen sewage discharge and Regarding the frequency of liquid chlorine analysis, such a high concentration can easily cause the accumulation of a large amount of NCl3. If the liquid chlorine storage tank is discharged through an embedded pipe, try to ensure that the liquid level is as high as possible. A low liquid level can easily cause the NCl3 concentration to increase, and the consequences can be very serious.
Control of inorganic ammonium and total ammonium in primary brine
If the NCL3 concentration in the chlorine main pipe is too high, it must be because the inorganic ammonia and organic amines were not completely treated in the previous brine polishing treatment. The source of the amines should be investigated from the source. At the same time, the frequency of sewage discharge and liquid chlorine analysis should be strengthened. Such a high concentration can easily cause the accumulation of a large amount of NCl3.
The excessive ammonium content in the brine will cause the NCL3 in the chlorine main pipe to exceed the standard. If not processed in time, a high concentration of NCL3 will be formed in the liquid chlorine separator, which will pose a great threat to the safety of the system. In addition to promptly analyzing the ammonium content in the brine and absorbing it with alkaline liquid in the sewage tank and then discharging it promptly, if the NCL3 content in the main pipe still exceeds the standard, only an ammonium removal tower can be added to the brine section to remove ammonium.