CN203432208U - Device for extracting high-purity oxygen and nitrogen under ultra-low pressure - Google Patents
Device for extracting high-purity oxygen and nitrogen under ultra-low pressure Download PDFInfo
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- CN203432208U CN203432208U CN201320411909.7U CN201320411909U CN203432208U CN 203432208 U CN203432208 U CN 203432208U CN 201320411909 U CN201320411909 U CN 201320411909U CN 203432208 U CN203432208 U CN 203432208U
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- rectifying column
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- rectifying tower
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Abstract
The utility model discloses a device for extracting high-purity oxygen and nitrogen under the ultra-low pressure. The device for extracting the high-purity oxygen and nitrogen under the ultra-low pressure comprises an expansion machine, a main heat exchanger, an oxygen rectifying tower, an upper rectifying tower, a lower rectifying tower and a subcooler, wherein the upper rectifying tower is connected to the upper portion of the lower rectifying tower, a condensation evaporator is arranged on the bottom of the upper rectifying tower, two output pipelines of the expansion machine are connected with the middle portion of the upper rectifying tower and the bottom portion of the oxygen rectifying tower respectively, a pipeline is arranged on the top portion of the lower rectifying tower and is connected with the condensation evaporator of the upper rectifying tower, and a pipeline is arranged on the bottom of the lower rectifying tower and is connected with the subcooler and the middle portion of the upper rectifying tower. Due to the fact that the booster expansion turbine is adopted and the three towers are adopted for rectifying, compared with traditional two-tower rectifying for air separation, the device for extracting the high-purity oxygen and nitrogen under the ultra-low pressure has the advantages that limited investment is increased, discharging pressure of an air compressor is reduced (0.4Mpa), energy consumption of an air separating device is greatly reduced, requirements of China for energy saving and emission reducing of high energy consumption industries are met, the oxygen extracting rate is 50%, the nitrogen extracting rate is 82%, the energy consumption is 0.115 kWh/Nm*3, and the ratio of the oxygen to the nitrogen can be adjusted freely between 1:2 and 1:8.
Description
Technical field
The utility model belongs to air separation technology field, particularly by air separation, is produced the device of oxygen and nitrogen.
Background technology
Along with socioeconomic development, in recent years, the application of air separation plant is constantly expanded, and as the industries such as petrochemical industry, glass, rubber, building, carbon fiber have, sets foot in.Industry is ever-increasing to the demand of nitrogen and oxygen, simultaneously to the energy-saving and cost-reducing also constantly higher requirement of proposition.Therefore, want to occupy whip hand on market, just must improve the recovery rate of product, reduce the operation energy consumption of device, the energy-saving potential of excavating equipment operation, makes full use of air simultaneously as far as possible, extracts nitrogen and oxygen wherein simultaneously.
Utility model content
The purpose of this utility model is to provide a kind of ultralow pressure high purity oxygen and nitrogen device, overcomes that current handicraft product recovery rate is low, device operation energy consumption larger defect.
The technical solution of the utility model is:
Ultralow pressure high purity oxygen and nitrogen device, comprise decompressor, main heat exchanger, oxygen rectifying column, upper rectifying column, lower rectifying column and subcooler, upper rectifying column is connected to the top of lower rectifying column, the bottom of upper rectifying column is provided with condenser/evaporator, and the two-way output pipe of decompressor is connected with the bottom of oxygen rectifying column with the middle part of upper rectifying column respectively; The top of lower rectifying column is provided with pipeline and is connected with the condenser/evaporator of upper rectifying column; The bottom of lower rectifying column is provided with the middle part that pipeline connects subcooler and upper rectifying column, the bottom of upper rectifying column is provided with pipeline connection subcooler and then connects respectively the upper top of rectifying column and the top of oxygen rectifying column, and the top of oxygen rectifying column and the top of upper rectifying column are provided with pipeline and connect main heat exchanger.
The decompressor that air after purifying is carried out to swell refrigeration is the swollen unit of turbine boosting.
Described upper rectifying column and oxygen rectifying column are structured packing rectifying column.
The utility model is the cooling distillation system that enters of air after purifying, the described distillation system three grades of distillation systems that upper rectifying column and lower rectifying column and oxygen rectifying column form of serving as reasons; Air after wherein purifying is divided into two-way: wherein a road enters decompressor and carries out swell refrigeration, and after expanding, air enters rectifying column middle part, and an other road is cooled to enter after saturation temperature and enters lower rectifying column after oxygen rectifying column again and carry out rectifying; Finally, in oxygen rectifying column bottom, obtain product oxygen, at upper rectifying column top, obtain product nitrogen gas.The row pressure of the utility model reparation technology air compressor is low, and energy consumption is low, greatly reduces the energy consumption requirement of air separation unit, meet the present requirement to the energy-saving and emission-reduction of high energy-consuming industry of country, oxygen extraction rate can reach 50% simultaneously, and nitrogen recovery rate can reach 82%, and energy consumption is 0.115 kWh/Nm
3.
The utility model, with respect to prior art, has following advantage:
The utility model adopts booster expansion turbine and three-tower rectification, two tower rectifying separated with conventional air are compared and have been increased limited investment, make air compressor row pressure reduce (0.4Mpa), greatly reduce the energy consumption requirement of air separation unit, meet the present requirement to the energy-saving and emission-reduction of high energy-consuming industry of country, oxygen extraction ratio is 50%, and nitrogen recovery rate is 82%, and energy consumption is 0.115 kWh/Nm
3, and oxygen, nitrogen product proportion can regulate arbitrarily between from 1:2 to 1:8.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
The specific embodiment
As shown in Figure 1, the utility model comprises decompressor, main heat exchanger, oxygen rectifying column, upper rectifying column, lower rectifying column and subcooler, upper rectifying column is connected to the top of lower rectifying column, the bottom of upper rectifying column is provided with condenser/evaporator, and the two-way output pipe of decompressor is connected with the bottom of oxygen rectifying column with the middle part of upper rectifying column respectively; The top of lower rectifying column is provided with pipeline and is connected with the condenser/evaporator of upper rectifying column; The bottom of lower rectifying column is provided with the middle part that pipeline connects subcooler and upper rectifying column, the bottom of upper rectifying column is provided with pipeline connection subcooler and then connects respectively the upper top of rectifying column and the top of oxygen rectifying column, and the top of oxygen rectifying column and the top of upper rectifying column are provided with pipeline and connect main heat exchanger.
The decompressor when air after purification carries out swell refrigeration is the swollen unit of turbine boosting.
In technique of the present utility model, raw air is compressed to 0.4MPa (G) by air compressor after removal of impurities, then to be chilled in advance air themperature be 8-10 ℃, then enters purification system and purifies.
Device of the present utility model, by the cooling distillation system that enters of air after purifying, the distillation system three grades of distillation systems that upper rectifying column 1 and lower rectifying column 2 and oxygen rectifying column 3 form of serving as reasons;
Air after wherein purifying is divided into two-way: wherein a road enters decompressor 4 and carries out swell refrigeration, after expanding, air enters rectifying column 1 middle part, an other road is cooled to enter after saturation temperature and enters lower rectifying column 2 after oxygen rectifying column 3 again and carry out rectifying, enters the middle and upper part of rectifying column 1 as phegma after liquefaction.Finally, in oxygen rectifying column 3 bottoms, obtain product oxygen, at upper rectifying column 1 top, obtain product nitrogen gas.
Enter the air that lower rectifying column 2 carries out rectifying, at lower rectifying column 2 tops, obtain nitrogen, in bottom, obtain oxygen-enriched liquid air; The nitrogen that lower rectifying column 2 tops obtain, the condenser/evaporator 5 that enters rectifying column 1 bottom as thermal source and in condenser/evaporator 5 by the low pure liquid oxygen of rectifying column 1 bottom be cooled to liquid nitrogen, liquid nitrogen through subcooler 6 cross be divided into after cold two parts respectively throttling enter upper rectifying column 1 top and oxygen rectifying column 3 tops participate in rectifying as phegma; Rectifying is carried out in the middle and upper part that the oxygen-enriched liquid air producing at lower rectifying 2 tower bottoms flows to rectifying column 1 through the cold deutomerite of subcooler 6 mistake; The nitrogen at upper rectifying column 1 top goes out tower and to normal temperature, as nitrogen product, delivers to user by subcooler 6 and main heat exchanger 7 re-heats; The oxygen producing in oxygen rectifying column 3 bottoms goes out tower and to normal temperature, as product, delivers to user by main heat exchanger 7 re-heats.
The waste gas at oxygen rectifying column 3 tops after main heat exchanger 7 re-heats as purification system regeneration gas.
Finally be back to oxygen content in the regeneration gas of purification system and be about 50%, regeneration temperature is 175 ℃.
Decompressor 4 when the air after purification carries out swell refrigeration adopts the swollen unit of turbine boosting.
In distillation system, upper rectifying column 1 and oxygen rectifying column 3 adopt the structured packing rectifying column of structured packing 50-60 dish to carry out rectifying.
In above-mentioned technique, concrete reflux ratio and other each parameters can be adjusted according to the situation of concrete rectifying column and oxygen rectifying column by those skilled in the art, also can assist the means such as existing simulation softward, set forth no longer one by one.
Claims (3)
1. ultralow pressure high purity oxygen and nitrogen device, it is characterized in that: comprise decompressor, main heat exchanger, oxygen rectifying column, upper rectifying column, lower rectifying column and subcooler, upper rectifying column is connected to the top of lower rectifying column, the bottom of upper rectifying column is provided with condenser/evaporator, and the two-way output pipe of decompressor is connected with the bottom of oxygen rectifying column with the middle part of upper rectifying column respectively; The top of lower rectifying column is provided with pipeline and is connected with the condenser/evaporator of upper rectifying column; The bottom of lower rectifying column is provided with the middle part that pipeline connects subcooler and upper rectifying column, the bottom of upper rectifying column is provided with pipeline connection subcooler and then connects respectively the upper top of rectifying column and the top of oxygen rectifying column, and the top of oxygen rectifying column and the top of upper rectifying column are provided with pipeline and connect main heat exchanger.
2. ultralow pressure high purity oxygen according to claim 1 and nitrogen device, is characterized in that: the decompressor that the air after purifying is carried out to swell refrigeration is the swollen unit of turbine boosting.
3. ultralow pressure high purity oxygen according to claim 1 and 2 and nitrogen device, is characterized in that: described upper rectifying column and oxygen rectifying column are structured packing rectifying column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320411909.7U CN203432208U (en) | 2013-07-11 | 2013-07-11 | Device for extracting high-purity oxygen and nitrogen under ultra-low pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320411909.7U CN203432208U (en) | 2013-07-11 | 2013-07-11 | Device for extracting high-purity oxygen and nitrogen under ultra-low pressure |
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| Publication Number | Publication Date |
|---|---|
| CN203432208U true CN203432208U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320411909.7U Expired - Lifetime CN203432208U (en) | 2013-07-11 | 2013-07-11 | Device for extracting high-purity oxygen and nitrogen under ultra-low pressure |
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| CN (1) | CN203432208U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438663A (en) * | 2013-07-11 | 2013-12-11 | 开封黄河空分集团有限公司 | Device and process for preparing high-purity oxygen and nitrogen under ultra-low pressure |
| CN105910388A (en) * | 2016-06-03 | 2016-08-31 | 开封黄河空分集团有限公司 | Air separation device and air separation method |
| CN109028760A (en) * | 2018-08-29 | 2018-12-18 | 开封黄河空分集团有限公司 | Air-separating plant |
-
2013
- 2013-07-11 CN CN201320411909.7U patent/CN203432208U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438663A (en) * | 2013-07-11 | 2013-12-11 | 开封黄河空分集团有限公司 | Device and process for preparing high-purity oxygen and nitrogen under ultra-low pressure |
| CN105910388A (en) * | 2016-06-03 | 2016-08-31 | 开封黄河空分集团有限公司 | Air separation device and air separation method |
| CN109028760A (en) * | 2018-08-29 | 2018-12-18 | 开封黄河空分集团有限公司 | Air-separating plant |
| CN109028760B (en) * | 2018-08-29 | 2024-01-19 | 开封黄河空分集团有限公司 | Air separation device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140212 |