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Operation to improve drainage and reduce the oxygen plant start-up time

After the cold liquid oxygen liquid oxygen pump pressure after the first, sent to the oxygen absorber, and from oxygen absorber to the secondary evaporator, the auxiliary evaporator vaporization into gaseous oxygen, and finally through the main heat exchanger after the re- cold box. That is, to establish normal operating conditions, liquid oxygen pumps and oxygen absorber must first put into use. 2 shorten 35OOOm3 / h oxygen plant liquid discharge time according to Air Liquide rules, in accordance with the first, and then under the main cooling tower, auxiliary evaporator, the crude argon condenser, the crude argon column, liquid oxygen absorber liquid discharge the order. Cold box of the liquid from the mains drainage into the confluence of the evaporator residue,[link widoczny dla zalogowanych], after evaporation venting drain. 2000 overhaul, according to Air Liquide operating procedures, the actual drainage time of 7 hours. 2002 35000m3 / h oxygen plant overhaul, we used the following improvements: (1) stop the day before, without affecting the production of the circumstances, staff will be on duty to run under the tower level, the main cold liquid, liquid crude argon column bit, the crude argon column condenser level as low as possible to maintain the minimum level; also sent to storage tanks for liquid products as possible. (2) one hour before the shutdown,[link widoczny dla zalogowanych], the cold liquid oxygen through the main valve discharge lines will be reserved for a tank of liquid oxygen transfer. To the shutdown, the main cold liquid level has dropped to 50% (normal level for the main condenser 80%). During this period, through the appropriate reduction in the amount of oxygen and stop the liquid oxygen, liquid nitrogen tanks and other means taken to maintain unit operation. (3) air separation system outages, the maintenance of liquid argon pump operation, as far as possible the bottom of the liquid argon to the main cooling tower, tank recovered from the total recovery of the liquid 23m3. While the rest of the cold box mains drainage of liquid from the confluence of the residue into the evaporator, venting vaporized. To take these measures, 2002 35000m3 / h oxygen plant overhaul, the actual drainage time of 4 hours, shorter than the original 3 hours. The recycling of oxygen, reducing the danger of liquid discharge. 3 shorten 350oOm3 / h oxygen plant start-up time by 35000m ~ / h oxygen plant operating procedures, air into the tower, followed by the main and auxiliary evaporator cold fluid, liquid injection of liquid oxygen absorber, oxygen circulation pump start, establishment of conditions and the main tower steps such as argon shipment, start time is 3 to 5 days. During the 2000 overhaul, the actual start time of 53 hours of oxygen, liquid argon into the tank to be 72 hours. 2002 35000m ~ / h oxygen plant overhaul, we used the following improvements. '3 .1 Use of recycled waste, in advance of the liquid injection of liquid oxygen absorber during startup, when the main and auxiliary evaporator cooling fluid to a normal level, to the liquid injection of liquid oxygen absorber, cooling and accumulation of liquid, lasted 8 hours, spend a lot of liquid, can not be transferred as soon as possible into the pure phase. 2002 35000m ~ / h oxygen plant overhaul, the use of recycled waste, by emission of an additional pipeline of new valves, in advance of the liquid injection of liquid oxygen absorber. When the main and auxiliary evaporator cooling fluid to a normal level, and immediately transferred into the pure phase, saving 8 hours. 3.2 The main stages of the cold fluid,[link widoczny dla zalogowanych], liquid nitrogen pump using liquid nitrogen storage bamboo mat to the main cold against the cold fluid in the main phase, when the main cooling liquid level rises to 28%, into the heat transfer area, the main cold liquid Repeated fluctuations in 4 to 5 hours continue to rise. 2002 35000m3 / h oxygen plant overhaul, we use liquid nitrogen pump to the main anti-tank liquid nitrogen cooling, maintained a high level to make up the main cooling. Pump 9.5 hours continuously, the accumulated liquid nitrogen and sent back 30m3,[link widoczny dla zalogowanych], save a lot of time. 3.3 The use of recycled waste. ■ increase the delivery of liquid anti-cold liquid when the Lord rose 50%, the cold liquid oxygen discharged through the main pipeline reserved 1 3.4. effusion in the main cooling stage, the timely shipment of crude ■ tower to send the large number of anti-liquid phase of the primary cooling capacity of cold fluid relatively rich, timely and open to the crude argon column liquid air valve, the amount will be transferred to the crude argon cold tower, the argon accumulation of fluid simultaneously with the main tower. conditions conducive to the stability of the main tower, to shorten the time with argon. As a result of these measures,[link widoczny dla zalogowanych], 35000m ~ / h oxygen plant overhaul, the December 23, 2002 17 when the air compressor to drive the oxygen out at 4:00 on the 25th, start time is only 35 hours, shorter than the operating procedures described in 37 to 85 hours shorter than in 2000 l8 hours. at 19 o'clock on the 23rd of qualified liquid argon into the tank, from start to liquid argon into the tank spent a total of 50 hours, 22 hours shorter. achieved good economic results. 4 Summary In summary, 35000m3 / h oxygen plant stage in the recovery of the liquid drain, drainage, saving time and reducing drainage risk; start to send back to the liquid fluid phase can save driving time, early production of qualified oxygen and argon.. cryogenic technology 1, 2004 CryogenicTechnologyNo12004'45.

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