CN111217341A - PSA nitrogen production system process flow - Google Patents
PSA nitrogen production system process flow Download PDFInfo
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- CN111217341A CN111217341A CN202010223262.XA CN202010223262A CN111217341A CN 111217341 A CN111217341 A CN 111217341A CN 202010223262 A CN202010223262 A CN 202010223262A CN 111217341 A CN111217341 A CN 111217341A
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- branch pipe
- pipe
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 67
- 230000026676 system process Effects 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- 239000007789 gas Substances 0.000 claims description 57
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 230000003584 silencer Effects 0.000 claims description 5
- 238000009298 carbon filtering Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 8
- 239000002808 molecular sieve Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
- 238000003795 desorption Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011031 large scale production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- -1 oxygen-nitrogen Chemical compound 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
- C01B21/0433—Physical processing only
- C01B21/045—Physical processing only by adsorption in solids
- C01B21/0455—Physical processing only by adsorption in solids characterised by the adsorbent
- C01B21/0472—Other molecular sieve materials
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0001—Separation or purification processing
- C01B2210/0009—Physical processing
- C01B2210/0014—Physical processing by adsorption in solids
- C01B2210/0015—Physical processing by adsorption in solids characterised by the adsorbent
- C01B2210/002—Other molecular sieve materials
Abstract
The invention discloses a PSA nitrogen-making system process flow, which comprises two adsorption towers A and B which are arranged in parallel, wherein the adsorption towers A and B are respectively connected with an air inlet main pipe through an air inlet branch pipe A and an air inlet branch pipe B, one end of the air inlet main pipe is provided with an air inlet, the air inlet branch pipe A and the air inlet branch pipe B are respectively provided with a tower A air inlet valve and a tower B air inlet valve, the adsorption towers A and B are respectively connected with an air outlet main pipe through an air outlet branch pipe A and an air outlet branch pipe B, one end of the air outlet main pipe is connected with a nitrogen buffer tank, the air outlet branch pipe A and the air outlet branch pipe B are respectively provided with a tower A air outlet valve and a tower B air outlet valve, the adsorption towers A and B are respectively connected with an upper pressure equalizing valve and respectively connected with a lower pressure equalizing valve in the tower A and a lower pressure equalizing valve in the tower B, the adsorption towers A and B are respectively connected with a tower vent valve and a tower B vent valve, the nitrogen production efficiency can be improved, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the field of nitrogen production, in particular to a PSA nitrogen production system process flow.
Background
With the economic development, nitrogen is widely used as an inert gas in the processes of inert protection of flammable and explosive materials, oxidation prevention of special materials, nitrogen filling and oxygen discharging of storage tanks and containers, fine chemical engineering, petrochemical engineering and the like. Industrial nitrogen production is mainly achieved by separating air. At present, there are three methods for producing nitrogen, namely, a cryogenic process, a Pressure Swing Adsorption (PSA) process and a membrane process. The cryogenic air separation method is used for liquefying air and rectifying the liquefied air to prepare nitrogen, and is suitable for large-scale production; the membrane air separation method has high requirements on the cleanness of compressed air, the filter element of the membrane is easy to age and corrode to lose efficacy, the membrane is difficult to repair, and the cost for replacing a new membrane is high; compared with the prior art, the PSA nitrogen production method has the advantages of simple process flow, high automation degree, quick start, small volume, quick gas production, low energy consumption, low operation cost, low investment and simple operation and maintenance, and the PSA nitrogen production method has obvious advantages within the nitrogen production capacity of less than 3000-5000 Nm 3/h.
The PSA nitrogen making method uses pressure as a circulating variable to separate a gas mixture, a pressure equalizing technology is commonly used in the PSA nitrogen making technology for desorption at present, the existing pressure equalizing technology generally adopts an upper pressure equalizing mode and a lower pressure equalizing mode, but the gas distribution purity in an adsorption tower is easy to be unequal, and gas transfer is carried out under the condition, so that the use efficiency of a molecular sieve is reduced, the greater purity fluctuation after the adsorption tower is switched is easy to cause, and the integral high energy consumption and low efficiency of the system are caused.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a process flow of a PSA (pressure swing adsorption) nitrogen making system, which can improve the nitrogen making efficiency and reduce the energy consumption.
In order to achieve the above purposes, the invention adopts the technical scheme that: a PSA nitrogen-making system process flow comprises two parallel adsorption towers A and B, the adsorption tower A and the adsorption tower B are respectively connected with an air inlet main pipe through an air inlet branch pipe A and an air inlet branch pipe B, an air inlet is arranged at one end of the air inlet main pipe, an A tower air inlet valve and a B tower air inlet valve are respectively arranged on the air inlet branch pipe A and the air inlet branch pipe B, the adsorption tower A and the adsorption tower B are respectively connected with the gas outlet main pipe through a gas outlet branch pipe A and a gas outlet branch pipe B, one end of the gas outlet main pipe is connected with the nitrogen buffer tank, the gas outlet branch pipe A and the gas outlet branch pipe B are respectively provided with a tower A gas outlet valve and a tower B gas outlet valve, adsorption tower A and adsorption tower B all are connected with last equalizer valve and are connected with equalizer valve under in A tower and the B tower respectively, adsorption tower A and adsorption tower B are connected with A tower atmospheric valve and B tower atmospheric valve respectively.
The invention provides a PSA nitrogen making system process flow, which has the beneficial effects that: connect adsorption tower A and adsorption tower B with last equalizer valve to set up the equalizer valve under in the A tower on the branch pipe of being connected with adsorption tower A, set up equalizer valve under in the B tower on the branch pipe of being connected with adsorption tower B, concentration gradient when guaranteeing voltage-sharing process gas and shifting improves molecular sieve's actual utilization efficiency effectively, and with reasonable gas transfer mode, make the purity fluctuation of adsorption tower switching back gas reduce greatly, improve the overall efficiency of system, reduce the power consumption.
Further, be provided with filter equipment on the inlet manifold, be provided with the active carbon filter layer in the filter equipment, avoid impurity to get into in the adsorption tower.
Furthermore, tower A atmospheric valve and tower B atmospheric valve all are connected with the muffler, reduce the noise that produces when nitrogen generator is emptied.
Further, branch pipe A and branch pipe B all are connected with the washing ball valve, utilize and wash the ball valve and wash the adsorption tower, have avoided the consumption of product nitrogen gas in the nitrogen buffer tank to guarantee product purity, thereby improved production efficiency.
Furthermore, middle and lower pressure equalizing ball valves are arranged on branch pipes where the middle and lower pressure equalizing valves in the tower A and the middle and lower pressure equalizing valves in the tower B, so that the flow regulation of gas is realized.
Further, the gas outlet of the nitrogen buffer tank is connected with the gas outlet classifying pipe, one end, far away from the nitrogen buffer tank, of the gas outlet classifying pipe is connected with the unqualified exhaust pipe and the qualified exhaust pipe respectively, and the unqualified exhaust pipe and the qualified exhaust pipe are provided with an unqualified vent valve and a qualified exhaust valve respectively to classify the produced nitrogen.
Furthermore, a nitrogen outlet flow meter is arranged on the air outlet classifying pipe, and the amount of discharged nitrogen can be monitored.
Further, nitrogen buffer tank gas outlet and nitrogen divide the appearance to pass through the sample branch connection, be provided with nitrogen gas sample relief pressure valve on the sample branch pipe, detect nitrogen gas composition to the control detection volume.
Furthermore, a nitrogen pressure reducing valve is arranged on the air outlet classifying pipe to adjust the air flow pressure.
Drawings
FIG. 1 is a process flow diagram of the present invention.
In the figure:
1-adsorption column a; 2-adsorption column B; 3-a tower inlet valve; 4-tower B air inlet valve; 5-a nitrogen buffer tank; 6-A tower gas outlet valve; 7-B tower gas outlet valve; 8-a pressure equalizing valve is arranged; a lower pressure equalizing valve in the 9-A tower; a lower pressure equalizing valve in the tower 10-B; 11-a column vent valve; 12-B tower vent valve; 13-a filtration device; 14-a silencer; 15-flushing the ball valve; 16-middle and lower pressure equalizing ball valves; 17-unqualified emptying valve; 18-nitrogen outlet flow meter; 19-azotometer; 20-nitrogen sampling pressure reducing valve; 21-nitrogen pressure reducing valve; 22-qualified exhaust valve.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to the attached figure 1, a PSA nitrogen-making system process flow comprises two adsorption towers A1 and B2 which are arranged in parallel, wherein the adsorption tower A1 and the adsorption tower B2 are respectively connected with an air inlet main through an air inlet branch pipe A and an air inlet branch pipe B, one end of the air inlet main is provided with an air inlet, the air inlet main is provided with a filtering device 13, the filtering device 13 is internally provided with an active carbon filtering layer, the air inlet branch pipe A and the air inlet branch pipe B are respectively provided with an A tower air inlet valve 3 and a B tower air inlet valve 4, the adsorption tower A1 and the adsorption tower B2 are respectively connected with an air outlet main through an air outlet branch pipe A and an air outlet branch pipe B, one end of the air outlet main is connected with a nitrogen buffer tank 5, the air outlet branch pipe A and the air outlet branch pipe B are respectively provided with an A tower air outlet valve 6 and a B tower air outlet valve 7, the adsorption tower A1 and the adsorption tower B2 are both connected with an upper pressure equalizing valve 8, a middle-lower pressure equalizing ball valve 16 is arranged on a branch pipe where a lower pressure equalizing valve 9 in the tower A and a lower pressure equalizing valve 10 in the tower B are respectively arranged, an adsorption tower A1 and an adsorption tower B2 are respectively connected with a tower A emptying valve 11 and a tower B emptying valve 12, the tower A emptying valve 11 and the tower B emptying valve 12 are both connected with a silencer 14, a gas outlet branch pipe A and a gas outlet branch pipe B are both connected with a flushing ball valve 15, when gas flows out of the adsorption tower A1 to reach the gas outlet branch pipe A, a part of the gas enters the flushing ball valve 15 and flows into the adsorption tower B2 to flush the gas, and when the gas flows out of the adsorption tower B2 to reach the gas outlet branch pipe B, a part of the gas enters the flushing ball valve 15 and flows into the adsorption tower A1 to flush the gas;
the gas outlet of the nitrogen buffer tank 5 is connected with a gas outlet classification pipe, a nitrogen outlet flow meter 18 is arranged on the gas outlet classification pipe, a nitrogen pressure reducing valve 21 is arranged on the gas outlet classification pipe, one end of the gas outlet classification pipe, far away from the nitrogen buffer tank 5, is respectively connected with an unqualified exhaust pipe and a qualified exhaust pipe, an unqualified emptying valve 17 and a qualified exhaust valve 22 are respectively arranged on the unqualified exhaust pipe and the qualified exhaust pipe, the gas outlet of the nitrogen buffer tank 5 is connected with a nitrogen analyzer 19 through a sampling branch pipe, and a nitrogen sampling pressure reducing valve 20 is arranged on the;
all the valves are electrically connected by an electromagnetic valve set.
The specific working process is as follows: air enters from an air inlet, and is primarily filtered by a filtering device 13, then an air inlet valve 3 of a tower A, an air outlet valve 6 of the tower A and a vent valve 12 of a tower B are opened, so that the air enters an adsorption tower A1 after passing through an air inlet branch pipe A from an air inlet header pipe, oxygen and nitrogen are separated by a carbon molecular sieve in an adsorption tower A1, then the air enters a nitrogen buffer tank 5 after passing through an air outlet branch pipe A through an air outlet header pipe, oxygen molecules adsorbed in an adsorption tower B2 are evacuated by the vent valve 12 of the tower B and a silencer 14 while nitrogen is produced by the adsorption tower A1, and desorption and deoxidation of the adsorption tower B2 are completed;
when the adsorption tower A1 works for a period of time and the adsorption of the carbon molecular sieve in the adsorption tower A1 to oxygen is close to saturation, closing the tower A air inlet valve 3, the tower A air outlet valve 6 and the tower B emptying valve 12, opening the upper pressure equalizing valve 8, opening the lower pressure equalizing valve 9 in the tower A after 2S, equalizing the pressure of the adsorption tower B2, and closing the upper pressure equalizing valve 8 and the lower pressure equalizing valve 9 in the tower A after equalizing the pressure;
carrying out adsorption of an adsorption tower B2 after pressure equalization, opening a tower B air inlet valve 4, a tower B air outlet valve 7 and a tower A emptying valve 11, enabling the gas to enter an adsorption tower B2 after passing through an air inlet branch pipe B from an air inlet main pipe, completing oxygen-nitrogen separation through a carbon molecular sieve in an adsorption tower B2, enabling the gas to enter a nitrogen buffer tank 5 after passing through an air outlet main pipe from an air outlet branch pipe B, and emptying oxygen molecules adsorbed in an adsorption tower A1 through the tower A emptying valve 11 and a silencer 14 while nitrogen is produced in the adsorption tower B2, thereby completing desorption and deoxidation of the adsorption tower A1;
when the adsorption tower B2 works for a period of time and the adsorption of the carbon molecular sieve in the adsorption tower B2 on oxygen is close to saturation, closing the tower B air inlet valve 4, the tower B air outlet valve 7 and the tower A emptying valve 11, opening the upper pressure equalizing valve 8, opening the lower pressure equalizing valve 10 in the tower B after 2S, equalizing the pressure of the adsorption tower A1, and closing the upper pressure equalizing valve 8 and the lower pressure equalizing valve 10 in the tower B after equalizing the pressure;
the adsorption tower A1 and the adsorption tower B2 are alternately adsorbed and desorbed, so that most of nitrogen and a small part of oxygen in the air are separated, the enriched oxygen is exhausted, the nitrogen is conveyed into a nitrogen storage tank, the concentration gradient during gas transfer in the pressure equalizing process is ensured, the actual utilization efficiency of the molecular sieve is effectively improved, the fluctuation of the purity of the gas after the adsorption towers are switched is greatly reduced in a reasonable gas transfer mode, the overall efficiency of the system is improved, and the energy consumption is reduced.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a PSA nitrogen system process flow, includes two adsorption tower A (1) and adsorption tower B (2) that parallel arrangement, its characterized in that: the adsorption tower A (1) and the adsorption tower B (2) are respectively connected with an air inlet main pipe through an air inlet branch pipe A and an air inlet branch pipe B, an air inlet is arranged at one end of the air inlet main pipe, an A tower air inlet valve (3) and a B tower air inlet valve (4) are respectively arranged on the air inlet branch pipe A and the air inlet branch pipe B, the adsorption tower A (1) and the adsorption tower B (2) are respectively connected with the gas outlet header pipe through the gas outlet branch pipe A and the gas outlet branch pipe B, one end of the gas outlet main pipe is connected with a nitrogen buffer tank (5), the gas outlet branch pipe A and the gas outlet branch pipe B are respectively provided with a tower A gas outlet valve (6) and a tower B gas outlet valve (7), the adsorption tower A (1) and the adsorption tower B (2) are both connected with an upper pressure equalizing valve (8) and are respectively connected with a middle-lower pressure equalizing valve (9) in the tower A and a middle-lower pressure equalizing valve (10) in the tower B, and the adsorption tower A (1) and the adsorption tower B (2) are respectively connected with a tower A emptying valve (11) and a tower B emptying valve (12).
2. The PSA nitrogen generation system process flow of claim 1, wherein: the air inlet main pipe is provided with a filtering device (13), and an activated carbon filtering layer is arranged in the filtering device (13).
3. The PSA nitrogen generation system process flow of claim 1, wherein: and the tower A emptying valve (11) and the tower B emptying valve (12) are both connected with a silencer (14).
4. The PSA nitrogen generation system process flow of claim 1, wherein: and the gas outlet branch pipe A and the gas outlet branch pipe B are both connected with a flushing ball valve (15).
5. The PSA nitrogen generation system process flow of claim 1, wherein: and middle and lower pressure equalizing ball valves (16) are arranged on branch pipes where the middle and lower pressure equalizing valves (9) and (10) in the tower A and the tower B are located.
6. The PSA nitrogen generation system process flow of claim 1, wherein: the gas outlet of the nitrogen buffer tank (5) is connected with the gas outlet classifying pipe, one end of the gas outlet classifying pipe, which is far away from the nitrogen buffer tank (5), is respectively connected with the unqualified exhaust pipe and the qualified exhaust pipe, and the unqualified exhaust pipe and the qualified exhaust pipe are respectively provided with an unqualified vent valve (17) and a qualified exhaust valve (22).
7. The PSA nitrogen generation system process flow of claim 6, wherein: and a nitrogen outlet flow meter (18) is arranged on the air outlet classifying pipe.
8. The PSA nitrogen generation system process flow of claim 6, wherein: the gas outlet of the nitrogen buffer tank (5) is connected with a nitrogen analyzer (19) through a sampling branch pipe, and a nitrogen sampling pressure reducing valve (20) is arranged on the sampling branch pipe.
9. The PSA nitrogen generation system process flow of claim 6, wherein: and a nitrogen pressure reducing valve (21) is arranged on the air outlet classifying pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010223262.XA CN111217341A (en) | 2020-03-26 | 2020-03-26 | PSA nitrogen production system process flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010223262.XA CN111217341A (en) | 2020-03-26 | 2020-03-26 | PSA nitrogen production system process flow |
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| CN111217341A true CN111217341A (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111825065A (en) * | 2020-07-17 | 2020-10-27 | 盖斯伊科技(苏州)有限公司 | Modular nitrogen making machine |
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2020
- 2020-03-26 CN CN202010223262.XA patent/CN111217341A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111825065A (en) * | 2020-07-17 | 2020-10-27 | 盖斯伊科技(苏州)有限公司 | Modular nitrogen making machine |
| CN111825065B (en) * | 2020-07-17 | 2021-05-28 | 滁州广钢气体有限公司 | Modular nitrogen making machine |
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