CN109297257A - A kind of equipment of making nitrogen and its method for preparing nitrogen - Google Patents
A kind of equipment of making nitrogen and its method for preparing nitrogen Download PDFInfo
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- CN109297257A CN109297257A CN201811085227.5A CN201811085227A CN109297257A CN 109297257 A CN109297257 A CN 109297257A CN 201811085227 A CN201811085227 A CN 201811085227A CN 109297257 A CN109297257 A CN 109297257A
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- Prior art keywords
- nitrogen
- heat exchanger
- air
- equipment
- fractionating column
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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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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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
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04775—Air purification and pre-cooling
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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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
- F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
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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
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
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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
- F25J3/044—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 single pressure main column system only
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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
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
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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
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
-
- 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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/74—Refluxing the column with at least a part of the partially condensed overhead gas
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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 invention discloses a kind of equipment of making nitrogen and its method for preparing nitrogen, the equipment of making nitrogen includes the self-cleaning air filter being sequentially communicated, air compressor, purifier and fractionating column；Shell-and-tube heat exchanger and plate-fin heat exchanger are provided between the air compressor and purifier；40 ° of air that air compressor is discharged can be cooled to 35 ° using recirculated cooling water as the first cold source by the shell-and-tube heat exchanger；The plate-fin heat exchanger uses fractionating column dirt nitrogen to bypass 15-20 ° mixed of reflux dirt nitrogen makes 35 ° of air themperatures be reduced to 20 ° as the second cold source with 35 ° of air heat-exchanges；Present device is at low cost, and low energy consumption, and energy-efficient performance is good, and occupied area is small；Meanwhile valve in the prior art and electrical equipment are eliminated, so that equipment is more economical, stable and reliable；The method for preparing nitrogen of the equipment of making nitrogen is simple and reliable, at low cost.
Description
Technical field
The present invention relates to the improvement of a kind of equipment of making nitrogen and its method for preparing nitrogen, especially a kind of equipment cost is low, low energy consumption,
The equipment of making nitrogen and its method for preparing nitrogen that occupied area is small and operation is more stable.
Background technique
With the development of domestic economy level, all trades and professions all be unable to do without gas industry and cryogenic technique, petrochemical industry, electricity
The nitrogen product that the industrial expansions such as sub-industry and polysilicon need is also more and more；The extensive use of space division is also to air separation plant
It proposes strict requirements: on the one hand, making the operation that equipment is safer and more reliable, stable；On the other hand, energy use check-up and
Equipment operating cost is also increasingly taken seriously；But the existing equipment of making nitrogen is usually selected according to the difference of air compressors
The mode of air cooling tower+water-cooling tower or precooler is as air precooling equipment；But air cooling tower+water-cooling tower mode takes up an area face
Product is big, complex process, and maintenance cost is high；Using precooler as air precooling equipment, equipment cost is high, and energy consumption is high.
It is set for this purpose, we have developed the nitrogen processed that a kind of equipment cost is low, low energy consumption, occupied area is small and operation is more stable
Standby and its method for preparing nitrogen.
Summary of the invention
There is provided that a kind of equipment cost is low, low energy consumption, land occupation face the invention aims to overcome the deficiencies in the prior art
The equipment of making nitrogen and its method for preparing nitrogen that product is small and operation is more stable.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: a kind of equipment of making nitrogen, include be sequentially communicated from
Clean formula air filter, air compressor, shell-and-tube heat exchanger, plate-fin heat exchanger, purifier and fractionating column；The self-cleaning
Air filter is for falling the contaminant filter in raw air；The air compressor can will pass through self-cleaning air filter
Filtered air is compressed to setting pressure, and then inlet pipe shell heat exchanger is tentatively cooled down, then again into plate-fin heat exchanger
It carries out second to cool down, then is purified into purifier, subsequently into fractionating column, prepare nitrogen.
Preferably, the shell-and-tube heat exchanger is using recirculated cooling water as the first cold source；After the fractionating column expansion
Dirty nitrogen takes part dirt nitrogen, directly mixes with the dirty nitrogen after re-heat, will flow out fractionating column before entering main heat exchanger re-heat
Dirty nitrogen temperature be reduced to 15-20 °；The second cold source is served as in described 15-20 ° dirty nitrogen reflux to plate-fin heat exchanger.
Preferably, air compressor can be discharged using recirculated cooling water as the first cold source for the shell-and-tube heat exchanger
40 ° of air be cooled to 35 °；Dirty nitrogen after the fractionating column expansion takes part dirt nitrogen before entering main heat exchanger re-heat,
It is directly mixed with the dirty nitrogen after re-heat, the dirty nitrogen temperature for flowing out fractionating column is reduced to 17 °；Described 17 ° dirty nitrogen refluxs
The second cold source is served as in plate-fin heat exchanger；Second cold source and 35 ° of air heat-exchanges, are further reduced to 35 ° of air themperatures
20°。
Preferably, cold insulation structure is used outside the plate-fin heat exchanger.
Preferably, the cold insulation structure is shell or heat-preservation cotton or polyurethane with insulation effect.
Preferably, the method for preparing nitrogen of the equipment of making nitrogen comprising the steps of:
Step 1: raw air is compressed to setting pressure by air compressor after self-cleaning air filter removes impurity, goes forward side by side
Enter shell-and-tube heat exchanger；
Step 2: using recirculated cooling water as the first cold source in shell-and-tube heat exchanger, 40 ° of air that air compressor is discharged
35 ° are cooled to, and enters plate-fin heat exchanger；Meanwhile the dirty nitrogen in fractionating column takes part before entering main heat exchanger re-heat
Dirty nitrogen is directly mixed with the dirty nitrogen after re-heat, and the dirty nitrogen temperature for flowing out fractionating column is reduced to 17 °, this strand of dirty nitrogen
It flows back into plate-fin heat exchanger and serves as the second cold source；
Step 3: in plate-fin heat exchanger, 17 ° of dirty nitrogen and 35 ° of air heat-exchanges, so that 35 ° of air themperatures are reduced to 20 °,
And enter purifier；
Step 4: entering fractionating column after adsorbing the moisture in raw air, carbon dioxide, hydrocarbon in purifier；
Step 5: fractionating column is fractionated to obtain high-purity nitrogen and dirty nitrogen, by high-purity nitrogen pneumatic transmission to user；Take part swollen simultaneously
Dirty nitrogen after swollen is mixed with the dirty nitrogen after re-heat, the dirty nitrogen temperature for flowing out fractionating column is down to 17 °, and flow back into plate
The second cold source is served as in fin heat exchanger, extra dirty nitrogen is discharged into air.
Due to the application of the above technical scheme, compared with the prior art, the invention has the following advantages:
The equipment of making nitrogen and nitrogen producing craft process of the present invention is combined by using shell-and-tube heat exchanger with plate-fin heat exchanger
Form, substitute precooler, to reach the cooling of air, equipment cost is low, and low energy consumption, and energy-efficient performance is good, and occupied area is small；
Meanwhile the valve in original technology and electrical equipment are eliminated, the economy of the equipment of making nitrogen, stability and reliable is significantly increased
Property.
Detailed description of the invention
Technical scheme of the present invention is further explained with reference to the accompanying drawing:
Attached drawing 1 is the working principle diagram of the equipment of making nitrogen of the present invention；
Wherein: 1, self-cleaning air filter；2, air compressor；3, shell-and-tube heat exchanger；4, plate-fin heat exchanger；5, it purifies
Device；6, fractionating column.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the present invention includes:
A kind of equipment of making nitrogen, include the self-cleaning air filter 1 being sequentially communicated, air compressor 2, shell-and-tube heat exchanger 3,
Plate-fin heat exchanger 4, purifier 5 and fractionating column 6；The self-cleaning air filter 1 is used for the impurity mistake in raw air
It filters；The air compressor 2 can will be compressed to setting pressure by 1 filtered air of self-cleaning air filter, then into
Shell-and-tube heat exchanger 3 is tentatively cooled down, and is then carried out second into plate-fin heat exchanger 4 again and is cooled down, then carries out into purifier 5
Purifying, subsequently into fractionating column 6, prepares nitrogen.
Wherein, the purifier 5 is used to adsorb moisture, carbon dioxide, the hydrocarbon etc. in air；The fractionating column
6 can be by air rectifying after purification at high-purity nitrogen and dirty nitrogen；The shell-and-tube heat exchanger 3 using recirculated cooling water as
First cold source, 40 ° of air that air compressor 2 can be discharged are cooled to 35 °；The dirty nitrogen after expansion in the fractionating column 6
Before entering main heat exchanger re-heat, part dirt nitrogen is taken, is directly mixed with the dirty nitrogen after re-heat, the dirty nitrogen of fractionating column will be flowed out
Temperature degree is reduced to 17 °；The second cold source is served as in described 17 ° dirty nitrogen refluxs to plate-fin heat exchanger 4；Second cold source and 35 °
Air heat-exchange makes 35 ° of air themperatures be further reduced to 20 °；The shell-and-tube heat exchanger 3 is combined with plate-fin heat exchanger 4, is risen
The effect of precooler, to reach the cooling of air.
Cold insulation structure is used outside plate-fin heat exchanger 4 described in the present embodiment, can provide efficient heat transfer effect, and cold air is not
It is easy to lose；The cold insulation structure can be the shell with insulation effect, be also possible to the inorganic heat preservation material such as heat-preservation cotton etc
Material, can also be the organic insulation material such as polyurethane etc.
The valve and electrical equipment in original technology are eliminated in the present invention, and the economy, steady of the equipment of making nitrogen is significantly increased
Qualitative, reliability.
The method for preparing nitrogen of the equipment of making nitrogen in the present embodiment is as follows:
Step 1: raw air is compressed to setting pressure by air compressor 2 after self-cleaning air filter 1 removes impurity, and
Into shell-and-tube heat exchanger 3；
Step 2: using recirculated cooling water as the first cold source in shell-and-tube heat exchanger 3,40 ° of skies that air compressor 2 is discharged
Air cooling enters plate-fin heat exchanger 4 to 35 °；Meanwhile the dirty nitrogen in fractionating column 6 after expansion is multiple into main heat exchanger
Before heat, the dirty nitrogen of 50Nm3/h is taken, is directly mixed with the dirty nitrogen after re-heat, the dirty nitrogen temperature for flowing out fractionating column is reduced
To 17 °, the second cold source is served as in this strand of dirty nitrogen reflux to plate-fin heat exchanger 4；
Step 3: in plate-fin heat exchanger 4,17 ° of dirty nitrogen and 35 ° of air heat-exchanges, so that 35 ° of air themperatures are reduced to
20 °, and enter purifier 5；
Step 4: entering fractionating column 6 after adsorbing the moisture in raw air, carbon dioxide, hydrocarbon in purifier 5；
Step 5: the fractionation of fractionating column 6 obtains high-purity nitrogen and dirty nitrogen, by high-purity nitrogen pneumatic transmission to user, while after taking expansion
The dirty nitrogen of 50Nm3/h is mixed with the dirty nitrogen after re-heat, the dirty nitrogen temperature for flowing out fractionating column is down to 17 °, and flow back into
The second cold source is served as in plate-fin heat exchanger 4, extra dirty nitrogen is discharged into air.
Increased shell-and-tube heat exchanger 3 and plate-fin heat exchanger 4, price aggregate are 3.6 ten thousand yuan in the present embodiment, are compared
In 50,000 yuan of procurement price of separate unit precooler, 1.4 ten thousand yuan of equipment cost can be saved.
Tests prove that in the present embodiment using the form combined with plate-fin heat exchanger 4 of shell-and-tube heat exchanger 3 as
Air precooling equipment, final total actual motion electrical power are 232KW, use precooler as sky compared in original technology
Gas Pre-cooling equipment, actual motion electrical power are 281KW, the average electricity that can save 49KW per hour, if pressing the electricity charge 0.58
Member calculates, and can save 24.9 ten thousand yuan or so within 1 year；And the energy consumption of package unit is greatly reduced, and compared with original technology, energy consumption
About 17.4% is reduced, energy-efficient performance is good.
Due to the application of the above technical scheme, compared with the prior art, the invention has the following advantages:
What the equipment of making nitrogen and its method for preparing nitrogen of the present invention were combined by using shell-and-tube heat exchanger with plate-fin heat exchanger
Form substitutes precooler, and to reach the cooling of air, equipment cost is low, and low energy consumption, and energy-efficient performance is good, and occupied area is small；Together
When, the valve and electrical equipment in original technology are eliminated, the economy of the equipment of making nitrogen, stability and reliable is significantly increased
Property.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and be implemented, and it is not intended to limit the scope of the present invention, it is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the scope of protection of the present invention.
Claims (6)
1. a kind of equipment of making nitrogen, it is characterised in that: include the self-cleaning air filter, air compressor, pipe being sequentially communicated
Shell heat exchanger, plate-fin heat exchanger, purifier and fractionating column；The self-cleaning air filter is used for will be in raw air
Contaminant filter falls；The air compressor can will be compressed to setting pressure by self-cleaning air filter filtered air, so
Laggard shell-and-tube heat exchanger is tentatively cooled down, and is then carried out second into plate-fin heat exchanger again and is cooled down, then into purifier into
Row purifying, subsequently into fractionating column, prepares nitrogen.
2. the equipment of making nitrogen according to claim 1, it is characterised in that: the shell-and-tube heat exchanger is made using recirculated cooling water
For the first cold source；Dirty nitrogen after the fractionating column expansion takes part dirt nitrogen, directly and again before entering main heat exchanger re-heat
Dirty nitrogen mixing after heat, is reduced to 15-20 ° for the dirty nitrogen temperature for flowing out fractionating column；Described 15-20 ° dirty nitrogen reflux is extremely
The second cold source is served as in plate-fin heat exchanger.
3. the equipment of making nitrogen according to claim 2, it is characterised in that: the shell-and-tube heat exchanger is made using recirculated cooling water
For the first cold source, 40 ° of air that air compressor is discharged can be cooled to 35 °；Dirty nitrogen after fractionating column expansion into
Before entering main heat exchanger re-heat, part dirt nitrogen is taken, is directly mixed with the dirty nitrogen after re-heat, the dirty nitrogen temperature of fractionating column will be flowed out
Degree is reduced to 17 °；The second cold source is served as in described 17 ° dirty nitrogen refluxs to plate-fin heat exchanger；Second cold source is changed with 35 ° of air
Heat makes 35 ° of air themperatures be further reduced to 20 °.
4. the equipment of making nitrogen according to claim 1, it is characterised in that: use cold insulation structure outside the plate-fin heat exchanger.
5. the equipment of making nitrogen according to claim 4, it is characterised in that: the cold insulation structure is the shell with insulation effect
Or heat-preservation cotton or polyurethane.
6. according to claim 1 in -5 any equipment of making nitrogen method for preparing nitrogen, which is characterized in that comprise the steps of:
Step 1: raw air is compressed to setting pressure by air compressor after self-cleaning air filter removes impurity, goes forward side by side
Enter shell-and-tube heat exchanger；
Step 2: using recirculated cooling water as the first cold source in shell-and-tube heat exchanger, 40 ° of air that air compressor is discharged
35 ° are cooled to, and enters plate-fin heat exchanger；Meanwhile the dirty nitrogen in fractionating column takes part before entering main heat exchanger re-heat
Dirty nitrogen is directly mixed with the dirty nitrogen after re-heat, and the dirty nitrogen temperature for flowing out fractionating column is reduced to 17 °, this strand of dirty nitrogen
It flows back into plate-fin heat exchanger and serves as the second cold source；
Step 3: in plate-fin heat exchanger, 17 ° of dirty nitrogen and 35 ° of air heat-exchanges, so that 35 ° of air themperatures are reduced to 20 °,
And enter purifier；
Step 4: entering fractionating column after adsorbing the moisture in raw air, carbon dioxide, hydrocarbon in purifier；
Step 5: fractionating column is fractionated to obtain high-purity nitrogen and dirty nitrogen, by high-purity nitrogen pneumatic transmission to user；Take part swollen simultaneously
Dirty nitrogen after swollen is mixed with the dirty nitrogen after re-heat, the dirty nitrogen temperature for flowing out fractionating column is down to 17 °, and flow back into plate
The second cold source is served as in fin heat exchanger, extra dirty nitrogen is discharged into air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811085227.5A CN109297257A (en) | 2018-09-18 | 2018-09-18 | A kind of equipment of making nitrogen and its method for preparing nitrogen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085227.5A CN109297257A (en) | 2018-09-18 | 2018-09-18 | A kind of equipment of making nitrogen and its method for preparing nitrogen |
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| CN109297257A true CN109297257A (en) | 2019-02-01 |
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| CN201811085227.5A Pending CN109297257A (en) | 2018-09-18 | 2018-09-18 | A kind of equipment of making nitrogen and its method for preparing nitrogen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864499A (en) * | 2019-12-02 | 2020-03-06 | 海南凯美特气体有限公司 | High-efficiency air separation system for recovering and treating waste nitrogen cold energy |
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| CN104390427A (en) * | 2014-10-21 | 2015-03-04 | 杭州福斯达实业集团有限公司 | High-temperature and low-temperature expansion energy-saving nitrogen production device and nitrogen production method |
| CN104976863A (en) * | 2015-07-15 | 2015-10-14 | 王林 | Low-energy-consumption inner compression air separation device and process |
| CN207379163U (en) * | 2017-08-28 | 2018-05-18 | 苏州制氧机股份有限公司 | Supercharging stream backed expansion nitrogen making machine after oxygen-enriched |
| CN209147573U (en) * | 2018-09-18 | 2019-07-23 | 苏州制氧机股份有限公司 | A kind of equipment of making nitrogen |
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2018
- 2018-09-18 CN CN201811085227.5A patent/CN109297257A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058266A (en) * | 1990-07-12 | 1992-01-29 | 英国氧气集团有限公司 | Air separation |
| CN104390427A (en) * | 2014-10-21 | 2015-03-04 | 杭州福斯达实业集团有限公司 | High-temperature and low-temperature expansion energy-saving nitrogen production device and nitrogen production method |
| CN104976863A (en) * | 2015-07-15 | 2015-10-14 | 王林 | Low-energy-consumption inner compression air separation device and process |
| CN207379163U (en) * | 2017-08-28 | 2018-05-18 | 苏州制氧机股份有限公司 | Supercharging stream backed expansion nitrogen making machine after oxygen-enriched |
| CN209147573U (en) * | 2018-09-18 | 2019-07-23 | 苏州制氧机股份有限公司 | A kind of equipment of making nitrogen |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110864499A (en) * | 2019-12-02 | 2020-03-06 | 海南凯美特气体有限公司 | High-efficiency air separation system for recovering and treating waste nitrogen cold energy |
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