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Continuous nitrogen argon system fault analysis and processing plug


v3 before and after the bypass valve has a pipe is discharged from the valve V353 liquid nitrogen under the tower on the tower over to the back flow of liquid nitrogen piping drain valves V354, so that the next part of the tower has not been cold liquid nitrogen directly into the top of the tower. Vaporization of the liquid in the pipe is relatively large rate, coupled with a slight shake the valve V3, so that the tower is not very stable conditions, the tower resistance fluctuations, unstable conditions argon system. 3.2 Operating conditions because trends in the inspection found that: the pressure on the tower's 0.041MPa from 01:50 up to 02:06 of the 0.049MPa, and then to 02:18 in 0.046MPa, 02:26 and quickly down to 0.034MPa. In other words, in just half an hour, the tower operating conditions experienced relatively large fluctuations. Operating records show: in 1:30 _-02: 00, nitrogen pollution to the water tower's opening valve V118 from 38% to 28%; in the maintenance of 18 minutes, then increase from 28% to 44.5% (10 minutes). At this point, AI705 value from 02:17 to 02:27 98.88% down to 80% of the crude argon column severe N plug. It should be said, at the first minor crude argon liquefaction of nitrogen block, the duty operator more timely treatment, but recovery in the subsequent adjustment of working conditions, some haste, indicating that nitrogen is not deep enough understanding of plug failure. All distillation hydrogen argon Nitrogen block occurred after the system, the improvement of working conditions is a process, first, N can not increase, followed by the materials to make components of the crude argon tower are changing. N plug failure in the first before yet completely eliminated, so that increased pressure on the tower, argon-rich region down, argon, nitrogen and argon fraction in the content increased, the oxygen content decreased, more nitrogen into the crude argon column, The result is blocked by nitrogen caused more serious problems. 4 Troubleshooting measures (1) quickly open large crude argon gas vent valve V712, increasing the amount of crude argon gas removed, the crude argon gas flow from the 178rn3 / h increased to 800m ~ / h or so, so that gathered in the crude argon condenser condensing The non-condensable nitrogen discharged by V712 valve tower. On the one hand to prevent the accumulation of nitrogen,[link widoczny dla zalogowanych], on the other hand strengthen the crude argon condenser heat exchanger, the crude argon condenser liquid air level down to normal levels. (2) appropriate turn it into crude argon condenser liquid air control valve V701, open the bottom of the crude argon condenser drain valve V763, as soon as possible reduce the liquid air liquid crude argon condenser to recover crude argon condenser work. (3) adequate off a small crude liquid argon into the crude argon column I control valve V713, open large crude liquid argon reflux valve crude argon column Ⅱ V703B, reduce the speed of the pump crude liquid argon, as many as possible remain in the crude liquid argon Ⅱ crude argon column, I tower at the bottom to prevent the crude argon tower back on the amount of excess fluid, causing further deterioration of conditions on the tower, decreased oxygen purity is too low. (4) off a small crude argon liquefaction liquid nitrogen control valve V711, does not open the liquefied crude argon gas condensate blowing valve V766, open the crude argon liquefaction liquid nitrogen purge valve V765, all related to the liquid argon argon balance tank control valve V708. (5) adjust the main tower of stable conditions,[link widoczny dla zalogowanych], appropriate to reduce the amount of product out of oxygen, increased nitrogen, remove the amount of nitrogen pollution, reduce the amount of air into the tower expansion. Simultaneous control of the main cold liquid oxygen level stable,[link widoczny dla zalogowanych], liquid oxygen product discharge valve fully closed V7, due to open large return valve V11 under the tower liquid nitrogen and liquid nitrogen product discharge valve V8. 5 Conclusion The earlier nitrogen blockage fault detection, handling the more early, the more easily be adjusted to normal conditions. Failure to plug the treatment of nitrogen decisive,[link widoczny dla zalogowanych], positive, and not other conditions in the recovery, this time will be delayed very long. I believe that failure in the treatment of nitrogen blockage, there are still some shortcomings: (1) The first occurred in the crude argon liquefaction failure of nitrogen block not paid enough attention, simply plug that the phenomenon of nitrogen only slightly, ignoring the next adjustment step recovery conditions. (2) 2:15 second crude argon column blocked by nitrogen conditions at the beginning, dealing with failure is not positive enough nitrogen blockage, simply open the V712 valve discharge of nitrogen, until 2:30 the crude argon column plug serious condition N only when they started to take active measures to delay the valuable processing time. (3) off a small V701 valve,[link widoczny dla zalogowanych], air-conditioning did not take into account the lower tower section of the valve fluid movement V1, V1 valve opening automatically under the control of the increasingly large liquid air into the tower increases, the distillation section of the reflux ratio Tati increase and prolong the recovery time of oxygen purity. Operators should always be in the production of sober, serious changes in the parameters of surveillance and careful operation; the same time, efforts to improve the whole system of distillation hydrogen nitrogen and argon awareness and prevention of plug failures, changes in working conditions expected trends in training and comprehensive analysis to determine the problems, the whole distillation hydrogen argon system has an important role in normal operation. * 15 *

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