CN203534056U - Device for increasing nitrogen-to-oxygen ratio of air separation unit - Google Patents
Device for increasing nitrogen-to-oxygen ratio of air separation unit Download PDFInfo
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- CN203534056U CN203534056U CN201320342427.0U CN201320342427U CN203534056U CN 203534056 U CN203534056 U CN 203534056U CN 201320342427 U CN201320342427 U CN 201320342427U CN 203534056 U CN203534056 U CN 203534056U
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Abstract
The utility model relates to a device for increasing the nitrogen-to-oxygen ratio of an air separation unit. On the basis of a presently-used air separation unit, and on the condition of not increasing energy consumption basically, the nitrogen-to-oxygen ratio of the air separation unit is increased to 2:1 or the requirement on continually increasing demand ratio of nitrogen and oxygen of users is met. The device comprises a main heat exchanger, an expansion machine, a sub-cooler, a main rectifying tower and a cold box. The main rectifying tower is provided with a lower tower, an evaporator condenser and an upper tower. An auxiliary column is omitted, and meanwhile, the upper tower is increased by about 30% on the basis of the original height. The upper tower is directly connected with a nitrogen pipeline. Nitrogen and waste nitrogen are delivered by the aid of an original waste nitrogen pipeline and the nitrogen pipeline respectively, and are discharged from the cold box to be fed into respective pipelines after heat exchange. Cost required for pipeline and heat-exchange equipment modification is saved.
Description
Technical field
The utility model relates to a kind of device that improves air separation unit nitrogen oxygen product ratio.
Background technology
In recent years, along with the maximization of metallurgy industry blast furnace, converter and applying of oxygen-rich smelting technology, to the demand percentage of oxygen, nitrogen, there is larger variation in smelter, main manifestations is for to be greater than the growth to oxygen demand to the growth of nitrogen demand, according to rough Statistics, nitrogen oxygen has original 1:1 than demand, has brought up to 1.2:1 or higher.But the air separation unit of former supporting oxygen producing, nitrogen nitrogen oxygen product ratio when design is generally 1:1, and the output of oxygen, nitrogen product does not have large change substantially after putting into operation.If newly-built nitrogen oxygen product ratio is greater than the oxygen generating plant of 1:1 and substitutes existing equipment, existing equipment leaves unused and has caused waste so; If according to the newly-built equipment of making nitrogen of nitrogen breach, certainly will to cause so the significantly raising of production cost.And there is no at present effective reforming mode, to meet current oxygen nitrogen than the variation of demand.
As everyone knows, atmospheric oxygen content (on volume) accounts for 20.9%, and nitrogen content (on volume) accounts for 78.1%.When air separation unit nitrogen oxygen product ratio is 1:1, dirty nitrogen output is 57.2%, also want many for 2 times of nitrogen output, this is just for to transform existing air separation unit equipment component, and the exchange of nitrogen, dirty stream of nitrogen gas passage provides condition with raising nitrogen oxygen product ratio.
Utility model content
The purpose of this utility model cannot effectively meet oxygen nitrogen than changing for solving existing air separation unit exactly, and lack the problem of effective reforming mode, a kind of device that improves air separation unit nitrogen oxygen product ratio is provided, it is on existing air separation unit basis, and substantially do not increase in the situation of energy consumption, meet user to the ever-increasing demand of nitrogen oxygen product demand percentage.
For achieving the above object, the utility model adopts following technical scheme:
A device that improves air separation unit nitrogen oxygen product ratio, comprises ice chest, and a place of ice chest is connected with booster expansion turbine group, and booster expansion turbine group is connected with main heat exchanger, and main heat exchanger is connected with subcooler, and subcooler is connected with the upper tower of main distillation column;
Another place of ice chest is directly connected with main heat exchanger, and main heat exchanger is connected with the lower tower of main distillation column, between the Shang Ta of main distillation column and lower tower, is also provided with condenser/evaporator, and upper tower is directly connected with nitrogen pipeline, and upper tower is also directly connected with dirty channel of nitrogen.
A kind of device that improves air separation unit nitrogen oxygen product ratio, comprise main heat exchanger, decompressor, subcooler, main distillation column, ice chest, described main distillation column is only provided with lower tower, condenser/evaporator, upper tower, when cancelling auxiliary tower, making increases approximately 30% on the basis of tower tower height degree on former, upper tower is directly connected with nitrogen pipeline, nitrogen in ice chest, dirty stream of nitrogen gas passage is carrying out mutual switching with upper tower junction, be that nitrogen utilizes former dirty nitrogen pipeline to carry out heat exchange and conveying, dirty nitrogen utilizes former nitrogen pipeline to carry out heat exchange and conveying, nitrogen, after dirty nitrogen cooling box, switch to again former pipeline.
Compressed-air actuated part process decompressor pressuring expansion through purifying, then after main heat exchanger, subcooler cooling, enter tower on main fractionating tower and participate in rectifying, another part directly enters tower under main fractionating tower through main heat exchanger and participates in rectifying; Lower tower bottom liquid air enters upper tower middle part through subcooler and participates in rectifying, and lower top of tower nitrogen enters after the condenser/evaporator liquefaction of main distillation column, and a part is back to lower tower, and another part enters upper top of tower through subcooler and participates in rectifying, and fixed gas is directly emptying; Oxygen cooling box after subcooler, main heat exchanger re-heat that upper tower bottom is extracted out, dirty nitrogen is still taken out by upper tower middle and upper part, but in ice chest, gas channel and stream of nitrogen gas passage switch, after subcooler, main heat exchanger cooling box, switch the former dirty nitrogen pipeline of access, take out at the top that nitrogen substitutes original auxiliary tower by the upper tower having increased in the constant situation of the equivalent number of plates, in ice chest, gas channel correspondingly switches with dirty stream of nitrogen gas passage, switches the former nitrogen pipeline of access after subcooler, main heat exchanger cooling box.
Adopt a method for the raising nitrogen oxygen product ratio that improves air separation unit nitrogen oxygen product proportioning device, when cancelling auxiliary tower, making increases approximately 30% on the basis of tower tower height degree on former, tower nitrogen withdrawal amount is brought up to original more than 2 times, the actual conditions that after increasing according to nitrogen withdrawal amount, dirty nitrogen amount declines, by nitrogen, dirty nitrogen carries out the mutual switching of gas channel from taking-up place of upper tower, be that nitrogen utilizes former dirty nitrogen pipeline to carry out heat exchange and conveying, dirty nitrogen utilizes former nitrogen pipeline to carry out heat exchange and conveying, both existing pipeline and heat transmission equipment had been taken full advantage of, saved again because of pipeline modification after the increase of nitrogen withdrawal amount, subcooler and main heat exchanger heat exchange area change changes the expense increase causing, and after cooling box, correspondingly switch to former pipeline, the nitrogen oxygen product ratio that makes whole air separation unit by 1:1 brought up to 2:1 and more than.
The beneficial effects of the utility model are: substantially do not increasing under the condition of operating cost, by the mutual switching of increasing transformation and nitrogen, dirty stream of nitrogen gas passage of tower on air separation unit, realized air separation unit nitrogen oxygen product ratio by 1:1 bring up to 2:1 and more than, saved the idle waste causing of the newly-built air separation unit occupation of capital and used equipment.20000Nm for example
3/ h grade air separation unit improves after nitrogen oxygen product ratio, and nitrogen output is by 20000Nm
3/ h brings up to 60000Nm
3/ h, by confessing 0.01 yuan/m of profit
3calculate, can increase profit the whole year and be: ten thousand yuan of (60000-20000) * 365 * 24 * 0.01=350.4.
Accompanying drawing explanation
The existing air separation unit oxygen of Fig. 1 nitrogen production process chart;
Fig. 2 the utility model air separation unit oxygen nitrogen production process chart;
1. booster expansion turbine groups in figure, 2. ice chest, 3. main heat exchanger, 4. subcooler, 5. descends tower, 6. main distillation column, 7. condenser/evaporator, 8. goes up tower, 9. auxiliary tower, 10. channel of nitrogen, 11. dirty channel of nitrogen.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
In Fig. 1, a compressed air part through purifying enters ice chest 2 after 1 supercharging of booster expansion turbine group, after the preliminary cooling of main heat exchanger 3, again through booster expansion turbine group 1 cooling of expanding, the upper tower 8 of upper tower 8(of directly sending into main distillation column 6 after main heat exchanger 3, subcooler 4 coolings increases 30% on tower height degree basis on former) middle and upper part participate in rectifying; The lower tower 5 that another part is directly sent into main distillation column 6 after main heat exchanger 3 coolings participates in rectifying.The liquid air that lower tower bottom takes out enters upper tower 8 middle parts and participates in rectifying after subcooler 4 is excessively cold; Lower tower uprising gas enters the condenser/evaporator 7 liquefaction rear portions of main distillation column 6 and returns lower tower, and another part enters upper tower 8 tops and participates in rectifying, the direct emptying of on-condensible gas after subcooler 4 is excessively cold.Oxygen cooling box 2 after subcooler 4, main heat exchanger 3 re-heats that take out upper tower 8 bottoms; The dirty nitrogen that take out at upper tower 8 tops of main distillation column 6 is by dirty channel of nitrogen 11 cooling box 2 after subcooler 4, main heat exchanger 3 re-heats; The nitrogen that take out at auxiliary tower 9 tops is by channel of nitrogen 10 cooling box 2 after subcooler 4, main heat exchanger 3 re-heats.
Can find out, in this air separation unit, nitrogen is taken out by the auxiliary top of tower of main distillation column, auxiliary tower diameter causes circulation area significantly to dwindle much smaller than Shang Ta, and the channel of nitrogen such as subcooler, main heat exchanger circulation area is also to design than 1:1 by nitrogen oxygen, cannot nitrogen output is greatly improved by general operational means such as varying duties.
In Fig. 2, a compressed air part through purifying in this method enters ice chest 2 after 1 supercharging of booster expansion turbine group, after the preliminary cooling of main heat exchanger 3, expand and lower the temperature again through booster expansion turbine group 1, the middle and upper part of directly sending into the upper tower 8 of main distillation column 6 after main heat exchanger 3, subcooler 4 coolings participates in rectifying; The lower tower 5 that another part is directly sent into main distillation column 6 after main heat exchanger 3 coolings participates in rectifying.The liquid air that lower tower bottom takes out enters upper tower 8 middle parts and participates in rectifying after subcooler 4 is excessively cold; Lower tower uprising gas enters the condenser/evaporator 7 liquefaction rear portions of main distillation column 6 and returns lower tower, and another part enters upper tower 8 tops and participates in rectifying, the direct emptying of on-condensible gas after subcooler 4 is excessively cold.Oxygen cooling box 2 after subcooler 4, main heat exchanger 3 re-heats that take out upper tower 8 bottoms; It is identical with the height and position of upper tower in former method that dirty nitrogen takes out height and position, but after subcooler 4, main heat exchanger 3 re-heats, after cooling box 2, enter former dirty nitrogen pipeline by former channel of nitrogen 10 again; Nitrogen is taken out by upper tower 8 tops after increasing, but after subcooler 4, main heat exchanger 3 re-heats, after cooling box 2, enters former nitrogen pipeline by former dirty channel of nitrogen 11 again.
Describe for example: the 20000Nm that former design nitrogen oxygen product ratio is 1:1
3the upper tower height degree of/h air separation unit is 30440mm, and diameter is 2700mm, and auxiliary tower height degree is 4579mm, and diameter is 1920mm.Excise after auxiliary tower, upper tower is increased to 9150mm, make total height reach 39590mm, diameter is still 2700mm, and the height that upper tower increases is about 30.06% of former height.Upper tower increases rear dirty nitrogen, and to take out open height constant, and nitrogen is taken out mouthful corresponding 9150mm of increasing, and nitrogen, dirty nitrogen take out and go out tower after subcooler, main heat exchanger re-heat, because nitrogen, dirty nitrogen pipeline diameter in former air separation unit are respectively
508mm and
813mm, in the situation that oxygen withdrawal amount is constant, improve nitrogen oxygen ratio and increase exactly nitrogen withdrawal amount, circulating resistance is not just increased and must increase pipe diameter, actual conditions in view of the corresponding minimizing of dirty nitrogen withdrawal amount after the increase of nitrogen withdrawal amount, in air separation unit from tower nitrogen, dirty nitrogen is taken out a mouthful place and is carried out gas channel switching, be that nitrogen utilizes former dirty nitrogen pipeline to carry out heat exchange and conveying, dirty nitrogen utilizes former nitrogen pipeline to carry out heat exchange and conveying, nitrogen, after dirty nitrogen cooling box, switch to again former pipeline, after having met the raising of nitrogen oxygen ratio, each medium circulating resistance is constant, do not affect nitrogen, dirty nitrogen heat exchange efficiency, saved pipeline and subcooler, the expense that main heat exchanger is transformed or changed.
Claims (1)
1. a device that improves air separation unit nitrogen oxygen product ratio, is characterized in that, comprises ice chest, one place of ice chest is connected with booster expansion turbine group, booster expansion turbine group is connected with main heat exchanger, and main heat exchanger is connected with subcooler, and subcooler is connected with the upper tower of main distillation column;
Another place of ice chest is directly connected with main heat exchanger, and main heat exchanger is connected with the lower tower of main distillation column, between the Shang Ta of main distillation column and lower tower, is also provided with condenser/evaporator, and upper tower is directly connected with nitrogen pipeline, and upper tower is also directly connected with dirty channel of nitrogen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320342427.0U CN203534056U (en) | 2013-06-14 | 2013-06-14 | Device for increasing nitrogen-to-oxygen ratio of air separation unit |
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| CN201320342427.0U CN203534056U (en) | 2013-06-14 | 2013-06-14 | Device for increasing nitrogen-to-oxygen ratio of air separation unit |
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| CN203534056U true CN203534056U (en) | 2014-04-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949471A (en) * | 2015-05-14 | 2015-09-30 | 马钢(集团)控股有限公司 | Method for improving nitrogen yield of air separation device |
| CN106225420A (en) * | 2016-08-19 | 2016-12-14 | 浙江智海化工设备工程有限公司 | A kind of large-scale oxygen/nitrogen liquefaction plant of band deep freeze refrigerator |
| CN107021459A (en) * | 2016-01-29 | 2017-08-08 | 鞍钢股份有限公司 | A kind of oxygen making unit pure nitrogen gas switches dirty nitrogen device and method |
-
2013
- 2013-06-14 CN CN201320342427.0U patent/CN203534056U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949471A (en) * | 2015-05-14 | 2015-09-30 | 马钢(集团)控股有限公司 | Method for improving nitrogen yield of air separation device |
| CN107021459A (en) * | 2016-01-29 | 2017-08-08 | 鞍钢股份有限公司 | A kind of oxygen making unit pure nitrogen gas switches dirty nitrogen device and method |
| CN107021459B (en) * | 2016-01-29 | 2019-02-26 | 鞍钢股份有限公司 | A kind of oxygen making unit dirt nitrogen switches pure nitrogen gas device and method |
| CN106225420A (en) * | 2016-08-19 | 2016-12-14 | 浙江智海化工设备工程有限公司 | A kind of large-scale oxygen/nitrogen liquefaction plant of band deep freeze refrigerator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20150614 |
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| EXPY | Termination of patent right or utility model |