CN1041333A - A kind of making nitrogen by pressure swing adsorption method and equipment - Google Patents
A kind of making nitrogen by pressure swing adsorption method and equipment Download PDFInfo
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- CN1041333A CN1041333A CN 88106678 CN88106678A CN1041333A CN 1041333 A CN1041333 A CN 1041333A CN 88106678 CN88106678 CN 88106678 CN 88106678 A CN88106678 A CN 88106678A CN 1041333 A CN1041333 A CN 1041333A
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- nitrogen
- swing adsorption
- pressure swing
- tower
- molecular sieve
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Abstract
A kind of making nitrogen by pressure swing adsorption method and equipment.The invention belongs to gas separation technique field.The invention provides a kind of four towers pressurization absorption, normal pressure desorb nitrogen producing procedure that loads carbonaceous molecular sieve, reclaim this part the rich nitrogen that is lower than 99% concentration and wash residual exhaust gases in the carbonaceous molecular sieve layer.Producing nitrogen concentration is 99%.Design multiway rotary distributing valve and sequential control system can be led air, nitrogen and three kinds of medium branches of oxygen and the dominant discharge size.Adopt this technology can save vacuum pump; This device structure is simple, use is reliable.Can be the thermal treatment of metal nitrogen-based atmosphere, food nitrogen-filled packaging and storage etc. a kind of inexpensive and practical making nitrogen by pressure swing adsorption method and equipment are provided.
Description
The invention belongs to gas separation technique field.
Before the present invention, existing several making nitrogen by pressure swing adsorption methods and equipment thereof, as the rich nitrogen device of coke molecular sieve that instrument three factories in Ruian produce, this device adopts the nitrogen producing procedure of pressurization absorption, vacuum desorption, with the residual exhaust gases in the method elimination coke molecular sieve layer of vacuum pump suction, reproducing adsorbent.Its Controlling System is made up of the control valve of a greater number, complex structure, and device reliability is lower.U.S. Pat 4439213 nitrogen gas generating systems for another example, this device adopts the nitrogen producing procedure of pressurization absorption, normal pressure desorb, uses portioned product nitrogen to wash residual exhaust gases in the carbonaceous molecular sieve layer, reproducing adsorbent in the flow process.Its Controlling System is made up of several flowrate control valves, and structure is simpler, but will consume portioned product nitrogen.In the said apparatus or adopt two adsorption towers or adopt three adsorption towers.For the deficiency that overcomes above-mentioned processing method and device structure has been invented a kind of new making nitrogen by pressure swing adsorption method and processing unit thereof.
The objective of the invention is in making nitrogen by pressure swing adsorption technology, to provide the method for residual exhaust gases in a kind of new flushing carbonaceous molecular sieve layer, a kind of new valve control system is provided simultaneously, replace numerous valves with a valve, solve air, nitrogen and three kinds of medium branches of oxygen are led and the dominant discharge size.For the thermal treatment of domestic metal nitrogen-based atmosphere, food nitrogen-filled packaging and antistaling storing etc. provide a kind of cheapness practical making nitrogen by pressure swing adsorption method and equipment.
Main points of the present invention are: research trial four towers pressurization absorption, normal pressure desorb nitrogen producing procedure, solved and reclaimed the nitrogen that is lower than 99% concentration and wash residual exhaust gases in the carbonaceous molecular sieve layer, designed multiway rotary distributing valve and sequential control system, air, nitrogen and three kinds of medium branches of oxygen have been led and the dominant discharge size.Both can save the product nitrogen gas that is used to wash, device structure is simple again, uses reliable.
Below in conjunction with drawings and Examples, the present invention is further detailed explanation:
Fig. 1 is a process flow diagram.
Fig. 2 is the device structure synoptic diagram.
Fig. 3 is that four tower transformations absorption job order and time distribution diagram are separated.
Fig. 4 is the multiway rotary distributing valve part sectioned view.
Fig. 5 is the price fixing sectional view.
Fig. 6 is the sequential control system wiring diagram.
Raw air is compressed to 0.4MPa by oilless air compressor (1), is as cold as normal temperature through supercooler (2), sloughs water of condensation, and input air jar (3) steady pressure further separates dewatering again by centrifugal force through water-separating gas filter (4).Through multiway rotary distributing valve (11), import the adsorption tower (7) (8) (9) (10) of four filling carbonaceous molecular sieves in order respectively by pipeline (5).Based on carbonaceous molecular sieve to the rate of diffusion of oxygen, oxide gas molecule and the difference of adsorptive capacity two aspects, oxygen is absorbed enrichment, and nitrogen concentrates in gas phase gradually, goes out product nitrogen gas by overhead streams and enters nitrogen basin (6), be adsorbed the oxygen and the impurity of enrichment, contrary put Shi Congta at the bottom of emptying.
Four tower making nitrogen by pressure swing adsorption operation stepss, one-period divides 12 step programs, and per step program multiway rotary distributing valve hole and four towers take over that to be communicated with situation as shown in table 1.Be example with tower (7) below,, 12 step programs illustrated in turn with reference to Fig. 1 and table 1.
The first step absorption valve opening A
1Open, pressurized air is by the input of tower (7) bottom, and airborne oxygen is adsorbed by the carbonaceous molecular sieve layer, and nitrogen concentrates in gas phase gradually.At this moment, valve opening B
2, B
4And C
4Open, tower (9) is along putting decompression, the residual exhaust gases of nitrogen-enriched stream in tower (8) flushing carbonaceous molecular sieve layer.
Second step absorption valve opening A
1And A
3Open, pressurized air continues by the input of tower (7) bottom, pressurization absorption, and spissated product nitrogen flows to the nitrogen basin in the gas phase.At this moment, valve opening BD and C
4Open, tower (10) is all pressed, and nitrogen-enriched stream is finished regenerated tower (8) pressurising to, the contrary normal pressure that is put into of tower (9).
The absorption of the 3rd step, valve opening A
1, A
3And B
3Open, pressurized air continues by the input of tower (7) bottom, pressurization absorption, and spissated product nitrogen in the gas phase, part flows to the nitrogen basin, and part flows to tower (8) pressurising.At this moment, valve opening C
1, C
4And D
4Open, tower (10) is along putting decompression, and nitrogen-enriched stream is residual exhaust gases in tower (9) flushing carbonaceous molecular sieve layer.
The 4th step stopped, at this moment, and valve opening B
1, C
2, C
4And D
4Open, pressurized air is by the input of tower (8) bottom, and pressurization is adsorbed, and airborne oxygen is adsorbed by carbonaceous molecular sieve, and nitrogen concentrates in gas phase gradually, and tower (10) continues along putting decompression, the residual exhaust gases of nitrogen-enriched stream in tower (9) flushing carbonaceous molecular sieve layer.
The 5th step all pressed, and valve opening AC opens, and nitrogen-enriched stream is to tower (9) pressurising, at this moment, and valve opening B
1, B
3And D
2Open, pressurized air continues by the input of tower (8) bottom, pressurization absorption, and spissated product nitrogen flows to the nitrogen basin in the gas phase, and tower (10) is contrary to be put to normal pressure.
The 6th step is along putting valve opening A
4And D
2, D
4Open, along putting decompression, the residual exhaust gases of nitrogen-enriched stream in tower (10) flushing carbonaceous molecular sieve layer.At this moment, valve opening B
1, B
3And C
3Open, pressurized air continues by the input of tower (8) bottom, pressurization absorption, and spissated product nitrogen partly flows to the nitrogen basin in the gas phase, and part flows to tower (9) pressurising.
The 7th step is along putting valve opening A
4And D
2, D
4Continue to open, identical with the 6th step.At this moment, valve opening C
1Open, pressurized air is by the input of tower (9) bottom, and pressurization is adsorbed, and airborne oxygen is adsorbed by carbonaceous molecular sieve, and nitrogen concentrates in gas phase gradually.
The 8th step is against putting valve opening A
2Open the contrary normal pressure that is put into.At this moment, valve opening BD and C
1, C
3Open, tower (9) is all pressed, and to tower (10) pressurising, pressurized air continues by the input of tower (9) bottom with nitrogen-enriched stream, pressurization absorption, and spissated product nitrogen flows to the nitrogen basin in the gas phase.
The flushing of the 9th step, valve opening A
2, A
4And B
4Open, tower (9) is along putting decompression, the residual exhaust gases of nitrogen-enriched stream in tower (7) flushing carbonaceous molecular sieve layer.At this moment, valve opening C
1, C
3And D
3Open, pressurized air continues by the input of tower (9) bottom, pressurization absorption, and spissated product nitrogen partly flows to the nitrogen basin in the gas phase, and part flows to tower (10) pressurising.
The flushing of the tenth step, valve opening A
2, A
4And B
4Continue to open, identical with the 9th step.At this moment, valve opening D
1Open, pressurized air is by the input of tower (10) bottom, and pressurization is adsorbed, and airborne oxygen is adsorbed by carbonaceous molecular sieve, and nitrogen concentrates in gas phase gradually.
The 11 step pressurising, valve opening AC opens, and rich nitrogen flows to tower (7) pressurising by tower (9).At this moment, valve opening B
2And D
1, D
3Open, the contrary normal pressure that is put into of tower (8), pressurized air continues by the input of tower (10) bottom, pressurization absorption, spissated product nitrogen flows to the nitrogen basin in gas phase.
The 12 step pressurising, valve opening A
3And D
1, D
3Open, pressurized air continues by the input of tower (10) bottom, pressurization absorption, and spissated product nitrogen partly flows to the nitrogen basin in gas phase, and part flows to tower (7) pressurising.At this moment, valve opening B
2, B
4And C
4Open, tower (9) is along putting decompression, the residual exhaust gases of nitrogen-enriched stream in tower (8) flushing carbonaceous molecular sieve layer.
Fig. 3 represents above-mentioned one-period, 12 step programs, and job order between four towers and time distribute.As can be seen from the figure, the relativeness between four towers is immovable.
For implementing above-mentioned technological process, adopt the adsorption tower (7) (8) (9) (10) of four filling carbonaceous molecular sieves, and designed a multiway rotary distributing valve (11) and a sequential control system (12).
Multiway rotary distributing valve (11) is made up of valve block (14) and a rotating disk (17) that has air inlet hole (15) and waste discharge pore (16) of a price fixing (13), a filled polytetrafluoroethylene.Have 9 holes on the price fixing plane, wherein 8 holes (18) (19) respectively with four tower upper and lower ends pipe connection, another hole (20) are connected with nitrogen basin pipeline, above-mentioned 9 holes are the normal open hole.Have 17 holes (21) on the plane of rotor disc, in each step program, all have corresponding hole to be communicated with hole on the price fixing, as shown in table 1, be equivalent to opening of valves, and being equivalent to valve, non-intercommunicating pore closes.Therefore a multiway rotary distributing valve has the function of 18 single control valves.
Sequential control system (12) has a TD-2 type micromotor (22), a K23J-L03 type electromagnetic gas valve (23), a pneumatic-to-current converter (24), a KW
1-1 type vernier switch (25) and safety fuse (26) constitute.
Price fixing is fixed, and last transverse plane is placed the filled polytetrafluoroethylene valve block, and rotating disk is placed on the valve block, and valve block plays sealing and antifriction function, the each 30 degree angles of changeing of rotating disk clockwise direction under the time-controlled system commander, and the step program of finishing is switched.Turn over successively 12 the step finish one-period, rotating disk is got back to starting position, the circulation that goes round and begins again, pressurized air is isolated product nitrogen gas continuously.
Making nitrogen by pressure swing adsorption method of the present invention, the nitrogen that utilizes recovery to be lower than 99% concentration washes the residual exhaust gases in the carbon molecular sieve layer, can save portioned product nitrogen, saves vavuum pump; Adopt adsorption tower, multiway rotary distributing valve, the sequential control system of four filling carbon molecular sieves in the equipment, but simplified structure, improved reliability, the nitrogen concentration of producing is 99%, widely popularizing value is arranged, can be that the required nitrogen such as the heat treatment of metal nitrogen-based atmosphere, food nitrogen-filled packaging and antistaling storing provide a kind of cheapness and practical nitrogen method processed and equipment.
Table 1 valve opening is opened situation
Annotate: " √ " is the valve opening turn-on flag
Claims (6)
1, a kind ofly loads the making nitrogen by pressure swing adsorption method that carbonaceous molecular sieve adopts pressurization absorption, normal pressure desorption technique flow process, it is characterized in that, reclaim the nitrogen that is lower than 99% concentration in the flow process and wash residual exhaust gases in the carbonaceous molecular sieve layer.
2, a kind of THE PRESSURE SWING ADSORPTION NITROGEN GENERATING DEVICE of forming by oilless air compressor (1), water cooler (2), air vessel (3), water-separating gas filter (4), pipeline (5), nitrogen basin (6), it is characterized in that it includes adsorption tower (7) (8) (9) (10), a multiway rotary distributing valve (11) and a sequential control system (12) of four filling carbonaceous molecular sieves.
3, according to the described THE PRESSURE SWING ADSORPTION NITROGEN GENERATING DEVICE of claim 2, it is characterized in that said multiway rotary distributing valve (11) includes valve block (14) and rotating disk (17) that has air inlet port (15) and waste discharge pore (16) of a price fixing (13), a filled polytetrafluoroethylene.
4, according to claim 2,3 described THE PRESSURE SWING ADSORPTION NITROGEN GENERATING DEVICE, it is characterized in that, said price fixing (13) has 9 holes on the plane, and wherein 8 holes (18) (19) are connected with four adsorption tower upper and lower ends pipelines respectively, and another hole (20) are connected with nitrogen basin pipeline.
5, according to claim 2,3 described THE PRESSURE SWING ADSORPTION NITROGEN GENERATING DEVICE, it is characterized in that, have 17 holes (21) on the said rotating disk (17), these holes all have corresponding hole to be communicated with hole on the price fixing in each step program.
According to the described THE PRESSURE SWING ADSORPTION NITROGEN GENERATING DEVICE of claim 2, it is characterized in that 6, said sequential control system (12) includes micromotor (22), electromagnetic gas valve (23), pneumatic-to-current converter (24), vernier switch (25) and safety fuse (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106678 CN1024915C (en) | 1988-09-24 | 1988-09-24 | Method and equipment for preparing nitrogen by pressure-changing absorption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106678 CN1024915C (en) | 1988-09-24 | 1988-09-24 | Method and equipment for preparing nitrogen by pressure-changing absorption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041333A true CN1041333A (en) | 1990-04-18 |
| CN1024915C CN1024915C (en) | 1994-06-08 |
Family
ID=4834344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88106678 Expired - Fee Related CN1024915C (en) | 1988-09-24 | 1988-09-24 | Method and equipment for preparing nitrogen by pressure-changing absorption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1024915C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035428C (en) * | 1994-06-08 | 1997-07-16 | 中国科学院山西煤碳化学研究所 | Circular ammonia no-hydrogen deoxygen purify system for drying polyamide fibre section |
| CN1085114C (en) * | 1996-12-20 | 2002-05-22 | 南京化工大学 | Catalyst for purifying nitrogen-contained gas to remove carbon monoxide and course thereof |
| CN111039259A (en) * | 2019-12-11 | 2020-04-21 | 宁夏泰富能源有限公司 | Skid-mounted methanol hydrogen production equipment for oil product production |
| CN111232937A (en) * | 2020-03-03 | 2020-06-05 | 杭州誉顺科技有限公司 | Multi-tower cyclic pressure swing adsorption nitrogen production device and method |
-
1988
- 1988-09-24 CN CN 88106678 patent/CN1024915C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035428C (en) * | 1994-06-08 | 1997-07-16 | 中国科学院山西煤碳化学研究所 | Circular ammonia no-hydrogen deoxygen purify system for drying polyamide fibre section |
| CN1085114C (en) * | 1996-12-20 | 2002-05-22 | 南京化工大学 | Catalyst for purifying nitrogen-contained gas to remove carbon monoxide and course thereof |
| CN111039259A (en) * | 2019-12-11 | 2020-04-21 | 宁夏泰富能源有限公司 | Skid-mounted methanol hydrogen production equipment for oil product production |
| CN111232937A (en) * | 2020-03-03 | 2020-06-05 | 杭州誉顺科技有限公司 | Multi-tower cyclic pressure swing adsorption nitrogen production device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1024915C (en) | 1994-06-08 |
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