CN100436989C - Method for preparing high purity oxygen using full low pressure air separation plant - Google Patents
Method for preparing high purity oxygen using full low pressure air separation plant Download PDFInfo
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- CN100436989C CN100436989C CNB2004100390564A CN200410039056A CN100436989C CN 100436989 C CN100436989 C CN 100436989C CN B2004100390564 A CNB2004100390564 A CN B2004100390564A CN 200410039056 A CN200410039056 A CN 200410039056A CN 100436989 C CN100436989 C CN 100436989C
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Abstract
The present invention provides a combined operating method for preparing oxygen with high purity by a full low-pressure air separating device. The operating method can enhance the purity of oxygen and can simultaneously guarantee the purity of other air separation products. The operating method comprises the steps that the output of oxygen, the quantity of air entering a tower and the degree of valve opening for conveying liquid air from a lower tower to an upper tower are regulated, so that the quantity of oxygen of air separation products is reduced by 5% to 25%, the quantity of the air entering the tower is increased by 2% to 10%, and the quantity of liquid air conveyed from the lower tower to the upper tower is increased by 5% to 35%; under the operating conditions, the purity of oxygen can be enhanced by 0.1% to 0.4%, and argon fraction can be kept at a normal value. The present invention has the advantages that the purity of oxygen of products is enhanced, which meets the requirement for oxygen with high purity, and the purity of nitrogen and argon of products is enhanced; at the same time, the present invention has the advantages of small amplitude of operating regulation, small influence on the operating condition of air separation, and high operability.
Description
Technical field
The invention belongs to technical field of oxygen generation, particularly provide the full low pressure air separation unit of a kind of usefulness to produce the method for high purity oxygen.
Background technology
Along with improving constantly of requiring of STEELMAKING PRODUCTION and clean steel technical research work further deeply, (requirement of nitrogen content＜15ppm) improves constantly to the high purity oxygen product.In addition, the market demand of high-purity liquid oxygen is also enlarging.And the flow scheme design of existing large-scale space division device generally can only the oxygen product of production purity about 99.6%, if adopt the method for further purifying, the product cost high yield is little, is difficult to satisfy the needs of large-scale industrial production.
Therefore, the optimization research by to existing full low pressure air separation unit high purity oxygen technology makes the existing direct production high purity oxygen of air separation unit (purity reaches more than 99.9%), and can continuous and stable production, is the preferred plan that solves demand and supply contradiction.
Product oxygen, nitrogen, argon generally adopt full low-pressure distillation method to extract in the large scale industry gas at present, and comparatively advanced technologies flow process and equipment that large-scale space division device is used mainly contain:
1, going up tower adopts structured packing to replace sieve-plate tower;
2, adopt full rectifying system argon;
3, processing air normal temperature purifies, and adopts molecular sieve transformation absorption (PSA) or alternating temperature absorption (TSA) technology;
4, detection, control, optimization and the Steam Generator in Load Follow that adopts DCS to carry out technical process regulated;
5, adopt up-to-date interior compression process, expanded air to advance the flow process of tower down, cut down the consumption of energy, reduce the purpose of investment to reach.
The product purity of typical cryogenic rectification air separation plant is generally: oxygen＞99.6%, nitrogen＞99.99%, argon＞99.999%.This programme is according to formulating the high purity oxygen production operation with sky shunting journey.
The means of high purity oxygen production technology analysis comprise following content:
1, sets up empty Mathematical Modeling of dividing distillation system;
2, finish distillation process and whole process analog computation;
3, under various operating mode, research and analyse analog computation result and practical operation contrast, practicable high purity oxygen production decision and operation method of adjustment are proposed.
Generally speaking, can have following two kinds of methods to improve oxygen product purity:
(1) reduces the product oxygen output, improve product oxygen purity.
When nitrogen output is constant, adjusts product oxygen and will make oxygen yield reduce to 95%～70% by 100%, oxygen purity improves 0.1～0.4 percentage point.As shown in Figure 1: along with oxygen product output reduces, oxygen purity continues to improve.The Changing Pattern of liquid oxygen and gaseous oxygen product is shown respectively among the figure.Fig. 2 and Fig. 3 are seen in nitrogen, the variation of argon product purity simultaneously.Fig. 2 demonstrates the relation of nitrogen and oxygen decrement, and along with the decrement variation of oxygen product, nitrogen purity decreases.Fig. 3 demonstrates: along with the output minimizing of oxygen product, argon content obviously descends in the argon cut.
(2) increase the processing air capacity, improve product oxygen purity
Adjust air compressor machine guide vane aperture, make entering tower air capacity increase by 2%～10% than design conditions, oxygen, when the nitrogen product yield is constant, product oxygen purity improves 0.1%～0.4% percentage point, and nitrogen purity slightly reduces simultaneously; Oxygen content improves in the argon cut, and argon content reduces.As shown in Figure 4: along with the raising of processing air capacity, oxygen purity continues to improve.The Changing Pattern of liquid oxygen and gaseous oxygen product is shown respectively among the figure, and Fig. 5 demonstrates: along with the variation of processing air capacity, nitrogen purity decreases.The variation tendency of liquid nitrogen and gaseous nitrogen product is shown respectively among the figure.Fig. 6 demonstrates: along with the variation of processing air capacity, argon content obviously descends in the argon cut, content of argon shown in the figure and the relation of processing air capacity.
Above-mentioned two kinds of methods all can make oxygen product purity raise 0.1～0.4 percentage point, but other product purities are brought influence: the nitrogen product purity descends to some extent, and argon cut purity descends significantly.
Summary of the invention
The objective of the invention is to: the method that provides the full low pressure air separation unit of a kind of usefulness to produce high purity oxygen, this method of operating are taken into account the purity of other space division products when improving oxygen product purity.Concrete operation method is as follows:
(1) reduce the product oxygen yield, tower is served the liquid air amount of tower under improving simultaneously;
When nitrogen output is constant, turn down product oxygen outlet valve aperture, make oxygen yield reduce 5%～30%, adjust simultaneously and serve tower backflow liquid air valve, make the liquid air amount increase by 5%～35%, this moment, oxygen purity improved 0.1～0.4 percentage point.As Fig. 7～shown in Figure 9.Fig. 7 demonstrates: along with the continuous decrement of oxygen product with serve tower backflow liquid air amount and increase, oxygen product purity improves.Fig. 8 demonstrates: along with the continuous decrement of oxygen product with serve tower backflow liquid air amount and increase, make that argon content increases in the argon cut.Fig. 9 demonstrates: along with the continuous decrement of oxygen product with serve tower backflow liquid air amount and increase, product argon purity improves constantly.
(2) increase the processing air capacity, tower is served the liquid air amount of tower under improving simultaneously.
Keep oxygen, nitrogen product yield constant, adjust the air compressor machine guide vane opening, make entering tower air capacity increase by 2%～10%, adjust simultaneously and go up tower backflow liquid air amount, make it to increase at 5%～35% o'clock, this moment, oxygen purity increased by 0.2～0.4 percentage point, the argon cut reduces and slows down, shown in Figure 10～12.Figure 10 demonstrates: along with the increase of air capacity, serving tower backflow liquid air amount simultaneously increases, and oxygen purity is improved continuously.Figure 11 demonstrates: along with the increase of air capacity, serving tower backflow liquid air amount simultaneously increases, and makes argon content raising in the argon cut.Figure falls into a trap and counts initial point and be---and air increment 5%, liquid air increases by 10%.Figure 12 demonstrates: along with the increase of air capacity, serving tower backflow liquid air amount simultaneously increases, and argon purity improves constantly.
(3) minimizing oxygen yield, tower is served the liquid air amount of tower under increasing the processing air capacity simultaneously and improving.
Adjust product oxygen, advance the tower air, go up the valve opening of tower backflow liquid air, make space division product oxygen decrement 5%～35%, advancing the tower air increases by 2%～10%, last tower backflow liquid air increment 5%～35%.Under above operating condition, oxygen purity increases by 0.1～0.4 percentage point, and the argon product purity reaches requirement.
The invention has the advantages that: at full low pressure air separation unit production high purity oxygen, calculate the operation scheme that proposes by analysis, both improved the purity of product oxygen; Taken into account the purity requirement of product nitrogen and argon again.Simultaneously, the operation adjusting range is less, and is less, workable to the operating condition influence that sky divides.
Description of drawings
Fig. 1 is the empty oxygen yield-oxygen purity figure of branch of the present invention.
Fig. 2 is the empty oxygen yield-nitrogen purity figure of branch of the present invention.
Fig. 3 is the empty oxygen yield-argon purity figure of branch of the present invention.The relation of content of argon shown in the figure and oxygen decrement.
Fig. 4 is the empty processing air capacity-oxygen purity figure that divides of the present invention.
Fig. 5 is the empty processing air capacity-nitrogen purity figure that divides of the present invention.
Fig. 6 is that the empty processing air capacity-argon cut that divides of the present invention contains spirogram.
Fig. 7 is the empty oxygen yield-liquid air amount-oxygen purity graph of a relation that divides of the present invention.Figure falls into a trap and counts initial point and be---and oxygen decrement 15%, liquid air increases by 12%.The Changing Pattern of purity of gaseous oxygen product shown in the figure and oxygen yield and liquid air amount.
Fig. 8 is the empty oxygen yield-liquid air amount-argon cut graph of a relation that divides of the present invention.Figure falls into a trap and counts initial point and be---and oxygen decrement 15%, liquid air increases by 12%.The Changing Pattern of argon content and oxygen yield and liquid air amount in the cut of argon shown in the figure.
Empty oxygen yield-liquid air amount-smart argon purity the graph of a relation that divides of Fig. 9.Figure falls into a trap and counts initial point and be---and oxygen decrement 15%, liquid air increases by 12%.The Changing Pattern of smart argon purity and oxygen yield and liquid air amount shown in the figure.
The empty processing air capacity-liquid air amount-oxygen purity graph of a relation that divides of Figure 10.Figure falls into a trap and counts initial point and be---and air increment 5%, liquid air increases by 10%.Purity of gaseous oxygen product shown in the figure and the Changing Pattern of processing air capacity and liquid air amount.
The empty processing air capacity-liquid air amount-argon cut graph of a relation that divides of Figure 11.Figure falls into a trap and counts initial point and be---and air increment 5%, liquid air increases by 10%.Argon content and the Changing Pattern of processing air capacity and liquid air amount in the cut of argon shown in the figure.
The empty processing air capacity-liquid air amount-smart argon graph of a relation that divides of Figure 12.Figure falls into a trap and counts initial point and be---and air increment 5%, liquid air increases by 10%.Smart argon purity shown in the figure and the Changing Pattern of processing air capacity and liquid air amount.
The specific embodiment
This operation scheme is by the performance tests of air separation unit, and oxygen purity reaches 99.9%, meets the requirement that high purity oxygen is produced.
Table 1 is 60000Nm
3The calculated data of air separation unit under the different operating operating mode.
The prediction of table 1 combination operation product purity
| Operating mode | Air increment % | Oxygen decrement % | Liquid air increment % | Oxygen purity % | Nitrogen purity % | Smart argon purity % |
| 1 | 5 | 10 | 10 | 99.95 | 99.994 | - |
| 2 | 5 | 10 | 20 | 99.94 | 99.991 | - |
| 3 | 5 | 10 | 30 | 99.92 | 99.988 | - |
| 4 | 2 | 10 | 30 | 99.82 | 99.995 | 99.997 |
| 5 | 2 | 12 | 30 | 99.85 | 99.994 | 99.998 |
| 6 | 2 | 12 | 25 | 99.86 | 99.995 | 99.999 |
| 7 | 3 | 12 | 30 | 99.88 | 99.992 | 99.999 |
| 8 | 3 | 12 | 28 | 99.89 | 99.992 | 99.999 |
| 9 | 3 | 12 | 27 | 99.90 | 99.993 | 99.999 |
Claims (2)
1, the full low pressure air separation unit of a kind of usefulness is produced the method for high purity oxygen, and it is characterized in that: guarantee the combination operation of other space division product purity in the time of the production high purity oxygen, concrete operation method is as follows:
Adjust product oxygen outlet valve aperture, make oxygen yield reduce 10%～12%, adjust simultaneously and go up tower backflow liquid air valve, make the liquid air amount increase by 10%～30%, the argon cut remains on normal value;
Perhaps, adjust the air compressor machine guide vane opening, make entering tower air capacity increase by 2%～5%, adjust simultaneously and go up tower backflow liquid air amount, make it to increase at 10%～30% o'clock, the argon cut remains on normal value;
2, produce the method for high purity oxygen according to the full low pressure air separation unit of the described usefulness of claim 1, it is characterized in that: reduce oxygen yield, and increase the processing air capacity, tower returns the liquid air amount of tower under improving simultaneously, and concrete operation method is as follows:
Adjust product oxygen, advance the tower air, go up the valve opening of tower backflow liquid air, make space division product oxygen decrement 10%～12%, advancing the tower air increases by 2%～5%, and last tower is served tower liquid air increment 10～30%; The argon cut remains on normal value under above operating condition.
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| CNB2004100390564A CN100436989C (en) | 2004-01-29 | 2004-01-29 | Method for preparing high purity oxygen using full low pressure air separation plant |
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| CN100436989C true CN100436989C (en) | 2008-11-26 |
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Citations (8)
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| CN1118061A (en) * | 1994-06-17 | 1996-03-06 | 英国氧气集团有限公司 | Air separation |
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| JP2002147949A (en) * | 2000-11-14 | 2002-05-22 | Nippon Sanso Corp | Air liquefying separation method and device |
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2004
- 2004-01-29 CN CNB2004100390564A patent/CN100436989C/en not_active Expired - Fee Related
Patent Citations (8)
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|---|---|---|---|---|
| DE3212875A1 (en) * | 1982-04-06 | 1983-10-06 | Linde Ag | Process and apparatus for the recovery of oxygen |
| CN1025068C (en) * | 1989-02-23 | 1994-06-15 | 琳德股份公司 | Method and apparatus for separating air by means of rectification |
| CN1124345A (en) * | 1994-05-04 | 1996-06-12 | 林德股份公司 | Method and apparatus for seperating air in low temperature |
| CN1118061A (en) * | 1994-06-17 | 1996-03-06 | 英国氧气集团有限公司 | Air separation |
| CN1169333A (en) * | 1996-06-28 | 1998-01-07 | 李树德 | All-low-pressure air separation technology |
| US6079223A (en) * | 1999-05-04 | 2000-06-27 | Praxair Technology, Inc. | Cryogenic air separation system for producing moderate purity oxygen and moderate purity nitrogen |
| CN1286387A (en) * | 1999-08-31 | 2001-03-07 | 普拉塞尔技术有限公司 | Cryogenic rectifying system for producing very high purity oxygen |
| JP2002147949A (en) * | 2000-11-14 | 2002-05-22 | Nippon Sanso Corp | Air liquefying separation method and device |
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