CN201637227U - High-purity nitrogen-air separation tower - Google Patents
High-purity nitrogen-air separation tower Download PDFInfo
- Publication number
- CN201637227U CN201637227U CN2010200103522U CN201020010352U CN201637227U CN 201637227 U CN201637227 U CN 201637227U CN 2010200103522 U CN2010200103522 U CN 2010200103522U CN 201020010352 U CN201020010352 U CN 201020010352U CN 201637227 U CN201637227 U CN 201637227U
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- CN
- China
- Prior art keywords
- tower
- nitrogen
- air separation
- column
- secondary tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/04969—Retrofitting or revamping of an existing air fractionation unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/0489—Modularity and arrangement of parts of the air fractionation unit, in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/04896—Details of columns, e.g. internals, inlet/outlet devices
- F25J3/04903—Plates or trays
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model provides a high-purity nitrogen-air separation tower, which comprises a main air separation tower and a plate type heat exchanger, and is characterized in that an auxiliary tower is connected to the top of the main air separation tower; a plurality of tower boards with small holes are arranged inside the auxiliary tower; a distillation cavity is arranged between every two tower boards; an overflow hopper is arranged on one side of each tower plate; a top opening of each overflow hopper corresponds to the distillation cavity; a cofferdam for keeping thickness of liquid is arranged on each tower plate; a nitrogen outlet on the auxiliary tower is connected to a nitrogen outlet on the plate type heat exchanger through a pipeline; and a distillation cavity at the bottom of the auxiliary tower is communicated with a distillation cavity inside the main air separation tower. The high-purity nitrogen-air separation tower modifies an original device, and further rectifies waste nitrogen and converts the same into pure nitrogen, thereby not only saving investment, but also obtaining needed products and sufficiently using original resources.
Description
Technical field:
Present technique relates to the empty branch of liquid field, relates in particular to a kind of high purity nitrogen air separation column.
Background technology:
The empty branch of at present full liquid mostly is an air circulation, to produce liquid oxygen, accounts for the 80%-90% of total amount of liquid, and liquid nitrogen is secondary, accounts for the 10%-20% of total amount of liquid.Pure nitrogen gas output when such air separation unit basis manufactures and designs is different, and general pure nitrogen gas (99.999%) accounts for the 20%-30% of total nitrogen amount, and dirty nitrogen (oxygen content is at 1-2%) then accounts for the 70%-80% of nitrogen amount.
When market or user's variation, the pure nitrogen gas demand increases, and this stylish installation one cover air separation unit is not calculated, and how high-quality and efficient extraction pure nitrogen gas has then become a problem of needing solution badly.
The utility model content:
The technical problem that solves:
The utility model provides a kind of high purity nitrogen air separation column, its objective is solution sky branch field in the past, the problem that the rate of recovery of pure nitrogen gas is low.
Technical scheme: the utility model is achieved through the following technical solutions:
High purity nitrogen air separation column, comprise main air distillation column and plate type heat exchanger, it is characterized in that: the top at described main air distillation column is connected with secondary tower, in described secondary tower, be provided with a plurality of column plates that have aperture, form the distillation chamber between per two column plates, side at each column plate is provided with overflow downcomer, the corresponding distillation of the open top of overflow downcomer chamber; Also be provided with the cofferdam that keeps the liquid thickness on the column plate on the described column plate; Nitrogen outlet on the described secondary tower is connected to the nitrogen outlet of plate type heat exchanger by pipeline; The distillation chamber of described secondary tower bottom and the distillation chamber UNICOM in the main air distillation column.
The height of described secondary tower is 13.5 meters, and diameter is 1750 millimeters to 2100 millimeters.
Nitrogen outlet on the described secondary tower is divided into the dirty nitrogen outlet that is arranged on the secondary tower bottom and is arranged on the pure nitrogen gas outlet at secondary tower top, and the diameter of the pipeline that is connected with dirty nitrogen outlet is 159 millimeters, and the pipeline diameter that is connected with the pure nitrogen gas outlet is 325 millimeters.
The diameter of the aperture on the described column plate is the 1.0-1.25 millimeter.
Advantageous effect:
The utility model provides a kind of high purity nitrogen air separation column, comprise main air distillation column and plate type heat exchanger, top at described main air distillation column is connected with secondary tower, in described secondary tower, be provided with a plurality of column plates that have aperture, form the distillation chamber between per two column plates, side at each column plate is provided with overflow downcomer, the corresponding distillation of the open top of overflow downcomer chamber; Also be provided with the cofferdam that keeps the liquid thickness on the column plate on the described column plate; Nitrogen outlet on the described secondary tower is connected to the nitrogen outlet of plate type heat exchanger by pipeline; The distillation chamber of described secondary tower bottom and the distillation chamber UNICOM in the main air distillation column.
We increase by one section and go up the tower rectifying section, and receive on the former pure nitrogen gas pipeline (φ 159) after original dirty nitrogen outlet caliber φ 325mm is contracted to φ 159mm, and the pure nitrogen gas outlet that will newly go up tower is designed to φ 325, receives on the dirty nitrogen outlet (φ 325) of former air separation unit.Allow improved purity nitrogen make the dirty nitrogen runner (φ 325mm) of former air separation unit leave with rage, and improved dirty nitrogen is walked the pure nitrogen gas runner (φ 159mm) of former air separation unit.Guarantee that two runner internal resistances are constant.The new transformation increases rectifying section height overall 13.5m, 12 of the numbers of plates, diameter phi 1750mm to 2100mm;
Improved device is as follows with the device effect contrast before transforming:
Air separation unit before transforming: liquid oxygen: 90m
3-100m
3/ day
Liquid nitrogen: 10-20m
3/ day
Dirty nitrogen: 9000-10000Nm
3/ h
High pure nitrogen: 2000-3000Nm
3/ h
Transform the new air separation unit in back: liquid oxygen: 90-100m
3/ day
Liquid nitrogen: 10-15m
3/ day
Dirty nitrogen: 2000-3000Nm
3/ h
High pure nitrogen: 9000-10000Nm
3/ h
This utility model is utilized original flow process and original device by last tower transformation and removable parts equipment, increases the technology of pure nitrogen gas (purity is more than 99.999%) output, makes the pure nitrogen gas of producing account for 3/4, and dirty nitrogen accounts for 1/4.This technology is to original air separation unit, owing to the situation that pure nitrogen gas is underproduce is very practical.
It utilizes original device to transform, and dirty nitrogen is carried out further rectifying, is transformed into pure nitrogen gas, promptly reduces investment outlay, and can obtain required product again, both reduces investment outlay, and makes full use of original resource again.
Description of drawings:
Fig. 1 is the prior art accompanying drawing;
Fig. 2 is an external structure schematic diagram of the present utility model;
Fig. 3 is the nitrogen pipeline schematic diagram of the utility model background technology;
Fig. 4 is a nitrogen pipeline schematic diagram of the present utility model;
Fig. 5 is the internal structure schematic diagram of the utility model secondary tower part.
The specific embodiment: the utility model is described further below in conjunction with accompanying drawing:
Shown in Fig. 2 and 5, high purity nitrogen air separation column, comprise main air distillation column 1 and plate type heat exchanger 2, be connected with secondary tower 4 at the top of described main air distillation column 1, in described secondary tower 4, be provided with a plurality of column plates 6 that have aperture 5, form distillation chamber 7 between per two column plates 6, be provided with overflow downcomer 8, the corresponding distillation of the open top of overflow downcomer 8 chamber 7 in a side of each column plate 6; Also be provided with the cofferdam 9 that keeps the liquid thickness on the column plate 6 on the described column plate 6; Nitrogen outlet on the described secondary tower 4 is connected to the nitrogen outlet of plate type heat exchanger 2 by pipeline; The distillation chamber 7 of described secondary tower 4 bottoms and the distillation chamber UNICOM in the main air distillation column 1.
The height of described secondary tower 4 is 13.5 meters, and diameter is 1750 millimeters to 2100 millimeters, and the quantity of described column plate 6 is 12, proves through test of many times, does the organic efficiency that will better guarantee pure nitrogen gas like this.
Nitrogen outlet on the described secondary tower 4 is divided into the dirty nitrogen outlet that is arranged on secondary tower 4 bottoms and is arranged on the pure nitrogen gas outlet at secondary tower 4 tops, the diameter of the pipeline that is connected with dirty nitrogen outlet is 159 millimeters, the pipeline diameter that is connected with the pure nitrogen gas outlet is 325 millimeters, that is to say, shown in Fig. 3 and 4, receive on the former pure nitrogen gas pipeline (φ 159) after in the utility model original dirty nitrogen outlet caliber φ 325mm being contracted to φ 159mm, and the pure nitrogen gas outlet of new secondary tower is designed to φ 325, receive on the dirty nitrogen outlet (φ 325) of former air separation unit.Allow improved purity nitrogen make the dirty nitrogen runner (φ 325mm) of former air separation unit leave with rage, and improved dirty nitrogen is walked the pure nitrogen gas runner (φ 159mm) of former air separation unit.Guarantee that two runner internal resistances are constant, to guarantee output pure nitrogen gas normally and efficiently.
The distillation process schematic diagram is seen accompanying drawing 5 in the tower, many apertures 5 are arranged on the column plate, its diameter is between 1.0-1.25mm, the steam that comes out in the main air distillation column 1, enter the distillation chamber 7 of the bottom in the secondary tower 4, in secondary tower 4, steam passes the aperture 5 of column plate 6 from bottom to top then, pass on the column plate 6 the liquid level bubbling and on, the direction of arrow among the figure shown in the A is the steam ascent direction.Cryogenic liquid flows through from column plate 6 according to certain route, too much through overflow downcomer 8 successively toward current downflow, cofferdam 9 keeps that liquid has a fixing thickness on the column plates, this is the condition that keeps rectifying normally to carry out; The direction of arrow among Fig. 5 shown in the B is the dirty direction of liquid.
Because the holding that is subjected to passing little gas flow hole, column plate bottom pressure is higher than upper pressure all the time, and aperture is enough little, so liquid that can not leaks down from aperture.Rising steam is dispersed into many strands of little airflows through on each layer column plate, enters liquid from aperture, and becomes minute bubbles and pass liquid, greatly increases the contact area with liquid, carries out mass-and heat-transfer.Every through one deck column plate, the oxygen content in the uprising gas is just lacked, and the oxygen content in the dropping liq is more.Be that oxygen component in the uprising gas is washed and stays.Through behind the abundant column plate, can reach customer requirements less than 2ppm to the nitrogen oxygen content of last top of tower.
This utility model utilizes original device to transform, and dirty nitrogen is carried out further rectifying, is transformed into pure nitrogen gas, promptly reduces investment outlay, and can obtain required product again, both reduces investment outlay, and makes full use of original resource again.
Claims (4)
1. high purity nitrogen air separation column, comprise main air distillation column (1) and plate type heat exchanger (2), it is characterized in that: be connected with secondary tower (4) at the top of described main air distillation column (1), in described secondary tower (4), be provided with a plurality of column plates (6) that have aperture (5), form distillation chamber (7) between per two column plates (6), side at each column plate (6) is provided with overflow downcomer (8), the corresponding distillation of the open top of overflow downcomer (8) chamber (7); Also be provided with the cofferdam (9) that keeps the liquid thickness on the column plate (6) on the described column plate (6); Nitrogen outlet on the described secondary tower (4) is connected to the nitrogen outlet of plate type heat exchanger (2) by pipeline; The distillation chamber (7) of described secondary tower (4) bottom and the interior distillation chamber UNICOM of main air distillation column (1).
2. high purity nitrogen air separation column according to claim 1 is characterized in that: the height of described secondary tower (4) is 13.5 meters, and diameter is 1750 millimeters to 2100 millimeters.
3. high purity nitrogen air separation column according to claim 2, it is characterized in that: the nitrogen outlet on the described secondary tower (4) is divided into the dirty nitrogen outlet that is arranged on secondary tower (4) bottom and is arranged on the pure nitrogen gas outlet at secondary tower (4) top, the diameter of the pipeline that is connected with dirty nitrogen outlet is 159 millimeters, and the pipeline diameter that is connected with the pure nitrogen gas outlet is 325 millimeters.
4. high purity nitrogen air separation column according to claim 1 is characterized in that: the diameter of the aperture (5) on the described column plate (6) is the 1.0-1.25 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200103522U CN201637227U (en) | 2010-01-20 | 2010-01-20 | High-purity nitrogen-air separation tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200103522U CN201637227U (en) | 2010-01-20 | 2010-01-20 | High-purity nitrogen-air separation tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201637227U true CN201637227U (en) | 2010-11-17 |
Family
ID=43081725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200103522U Expired - Fee Related CN201637227U (en) | 2010-01-20 | 2010-01-20 | High-purity nitrogen-air separation tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201637227U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949708A (en) * | 2016-11-25 | 2017-07-14 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of method for being reequiped to improve Low Voltage Pure nitrogen output to original cryogenic air separation plant |
-
2010
- 2010-01-20 CN CN2010200103522U patent/CN201637227U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949708A (en) * | 2016-11-25 | 2017-07-14 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of method for being reequiped to improve Low Voltage Pure nitrogen output to original cryogenic air separation plant |
| EP3327394A3 (en) * | 2016-11-25 | 2018-11-07 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for increasing low pressure pure nitrogen production by revamping original apparatus for cryogenic air separation |
| CN106949708B (en) * | 2016-11-25 | 2020-02-11 | 乔治洛德方法研究和开发液化空气有限公司 | Method for improving low-pressure pure nitrogen yield by modifying original low-temperature air separation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20101117 Termination date: 20130120 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |