CN109896508B - Novel pressure swing adsorption nitrogen production device, nitrogen production method thereof and nitrogen production system - Google Patents
Novel pressure swing adsorption nitrogen production device, nitrogen production method thereof and nitrogen production system Download PDFInfo
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- CN109896508B CN109896508B CN201910327859.6A CN201910327859A CN109896508B CN 109896508 B CN109896508 B CN 109896508B CN 201910327859 A CN201910327859 A CN 201910327859A CN 109896508 B CN109896508 B CN 109896508B
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 274
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 249
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 119
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000007789 gas Substances 0.000 claims abstract description 88
- 230000000670 limiting effect Effects 0.000 claims abstract description 40
- 239000003463 adsorbent Substances 0.000 claims abstract description 36
- 230000008929 regeneration Effects 0.000 claims abstract description 18
- 238000011069 regeneration method Methods 0.000 claims abstract description 18
- 230000001172 regenerating effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 11
- 238000012423 maintenance Methods 0.000 description 10
- 230000002035 prolonged effect Effects 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 8
- 238000003860 storage Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
The invention relates to a novel pressure swing adsorption nitrogen production device, a nitrogen production method thereof and a nitrogen production system thereof. The novel pressure swing adsorption nitrogen production device comprises a first adsorption tower, a second adsorption tower, a vacuum pump, a first flow limiting pore plate, a gas supply machine, a nitrogen tank and a valve group. The first current limiting orifice plate is arranged between the first adsorption tower and the second adsorption tower, the air outlet of the first adsorption tower is communicated with the air outlet of the second adsorption tower through the first current limiting orifice plate, when the first adsorption tower adsorbs, the first current limiting orifice plate is used for assisting in regenerating the adsorbent in the second adsorption tower, and when the second adsorption tower adsorbs, the first current limiting orifice plate is used for assisting in regenerating the adsorbent in the first adsorption tower. The novel pressure swing adsorption nitrogen production device can realize accurate control of air flow between adsorption towers, auxiliary adsorbent regeneration, and the whole system pressure is lower, so that production cost can be reduced.
Description
Technical Field
The invention relates to the technical field of gas preparation, in particular to a novel pressure swing adsorption nitrogen production device, a nitrogen production method and a nitrogen production system.
Background
The basic principle of pressure swing adsorption is to use adsorbents to have different adsorption capacities for adsorbents under different pressures and to have selective adsorption characteristics for each component of a separated gas mixture under a certain pressure. Under the condition of selective adsorption of the adsorbent, the impurity components in the raw materials are removed by pressure adsorption, and the adsorbent is regenerated by decompression and desorption of the impurities, so that nitrogen in the air can be separated to prepare the nitrogen. But the air pressure that current pressure swing adsorption nitrogen production field needs is high (is more than or equal to 0.5 MPa), and a set of novel pressure swing adsorption nitrogen production system generally needs equipment such as air compressor, cold drier, tertiary filter, air storage tank, two adsorption towers, a nitrogen storage tank, and air compressor running cost is high. And the compressor accessories, the filter, the air storage tank, the nitrogen storage tank and the adsorption tower also need to be replaced regularly, the pressure vessel detection is also needed regularly, and the maintenance cost is high.
Disclosure of Invention
Accordingly, it is necessary to provide a novel pressure swing adsorption nitrogen production apparatus, a nitrogen production method thereof, and a nitrogen production system, in order to solve the problem of how to reduce the cost of producing nitrogen.
A novel pressure swing adsorption nitrogen making device, comprising: the device comprises a first adsorption tower, a second adsorption tower, a vacuum pump, a first flow limiting orifice plate, a gas supply machine, a nitrogen tank and a valve group; the valve group includes: the device comprises a first air inlet valve, a second air inlet valve, a first air outlet valve, a second air outlet valve, a first exhaust valve and a second exhaust valve;
the air inlet of the first adsorption tower is communicated with the air supply machine through the first air inlet valve, the air inlet of the first adsorption tower is communicated with the vacuum pump through the first air outlet valve, and the air outlet of the first adsorption tower is communicated with the nitrogen tank through the first air outlet valve;
the air inlet of the second adsorption tower is communicated with the air supply machine through the second air inlet valve, the air inlet of the second adsorption tower is communicated with the vacuum pump through the second air outlet valve, and the air outlet of the second adsorption tower is communicated with the nitrogen tank through the second air outlet valve;
the first current limiting orifice plate is arranged between the first adsorption tower and the second adsorption tower, the air outlet of the first adsorption tower is communicated with the air outlet of the second adsorption tower through the first current limiting orifice plate, when the first adsorption tower adsorbs, the first current limiting orifice plate is used for assisting in regeneration of the adsorbent in the second adsorption tower, and when the second adsorption tower adsorbs, the first current limiting orifice plate is used for assisting in regeneration of the adsorbent in the first adsorption tower.
In one embodiment, the first restriction orifice plate is detachably connected between the first adsorption tower and the second adsorption tower; and the first restriction orifice plate is configured to: in the process of carrying out primary adsorption on the first adsorption tower or the second adsorption tower, the flow of the gas passing through the first current limiting orifice plate accounts for 3-7% of the total amount of the produced gas.
In one embodiment, the valve train further comprises a first pressure equalizing valve and a second pressure equalizing valve; the air inlet of the first adsorption tower is communicated with the air inlet of the second adsorption tower through the first pressure equalizing valve; the air outlet of the first adsorption tower is communicated with the air outlet of the second adsorption tower through the second pressure equalizing valve.
In one embodiment, a second flow limiting orifice plate is arranged between the air inlet of the first adsorption tower and the air inlet of the second adsorption tower, and the second flow limiting orifice plate is connected with the first equalizing valve in series; and/or
A third flow limiting orifice plate is arranged between the air outlet of the first adsorption tower and the air outlet of the second adsorption tower, and the third flow limiting orifice plate is connected with the second pressure equalizing valve in series.
In one embodiment, the valve train further comprises: a third exhaust valve and a fourth exhaust valve, the third exhaust valve and the fourth exhaust valve being connected in parallel with each other;
the third exhaust valve is respectively connected in series with the first exhaust valve and the second exhaust valve and is used for exhausting the gas passing through the first exhaust valve and the second exhaust valve to the outside;
the fourth exhaust valve is respectively connected with the first exhaust valve and the second exhaust valve in series and is used for enabling the first adsorption tower to be communicated with the vacuum pump through the first exhaust valve and enabling the second adsorption tower to be communicated with the vacuum pump through the second exhaust valve.
The method for preparing nitrogen by adopting the novel pressure swing adsorption nitrogen preparation device comprises the following steps:
step (1): starting the air feeder;
step (2): opening the first air inlet valve and the first air outlet valve to enable the first adsorption tower to adsorb; opening the second exhaust valve, starting the vacuum pump, reducing the pressure in the second adsorption tower to less than or equal to-0.85 bar, and regenerating the second adsorption tower; closing the first air inlet valve, the first air outlet valve and the second air outlet valve;
step (3): starting the gas supply machine to supply gas;
step (4): opening the second air inlet valve and the second air outlet valve to enable the second adsorption tower to adsorb; opening the first exhaust valve, starting the vacuum pump, reducing the pressure in the first adsorption tower to less than or equal to-0.85 bar, and regenerating the first adsorption tower; closing the second inlet valve, the second outlet valve and the first outlet valve;
step (5): and (3) sequentially and circularly carrying out the steps from the step (1) to the step (4) for n times, wherein n is an integer greater than or equal to 0.
In one embodiment, after opening the second exhaust valve, before opening the vacuum pump, the method further comprises the steps of:
opening the third exhaust valve, closing the fourth exhaust valve, reducing the pressure in the second adsorption tower, closing the third exhaust valve, opening the fourth exhaust valve, and communicating the second adsorption tower with the vacuum pump; and/or
After opening the first exhaust valve, before opening the vacuum pump, the method further comprises the following steps:
and opening the third exhaust valve, closing the fourth exhaust valve, reducing the pressure in the first adsorption tower, closing the third exhaust valve, opening the fourth exhaust valve, and communicating the first adsorption tower with the vacuum pump.
In one embodiment, after the step of closing the first air inlet valve, the first air outlet valve and the second air outlet valve, the step of opening the second air inlet valve and the second air outlet valve to enable the second adsorption tower to adsorb further comprises the following steps:
and opening the first pressure equalizing valve and the second pressure equalizing valve to balance the air pressure in the first adsorption tower and the second adsorption tower.
The utility model provides a novel pressure swing adsorption nitrogen making system, includes foretell novel pressure swing adsorption nitrogen making device and airtight space, novel pressure swing adsorption nitrogen making device the air feeder with airtight space's gas outlet intercommunication, novel pressure swing adsorption nitrogen making device the nitrogen gas jar with airtight space's air inlet intercommunication.
In one embodiment, the novel pressure swing adsorption nitrogen production system further comprises a third air inlet valve and a fourth air inlet valve, wherein the third air inlet valve is arranged between the air supply machine and the air outlet of the closed space and is used for controlling air in the closed space to enter the air supply machine;
the fourth air inlet valve is connected with the third air inlet valve in parallel and is used for controlling external air to enter the air supply machine.
According to the novel pressure swing adsorption nitrogen production device, on one hand, the vacuum pump is used for controlling the pressure in the first adsorption tower and the pressure in the second adsorption tower, the regeneration of the adsorbent is assisted, the adsorption efficiency of the adsorbent is improved, the system pressure is reduced, the equipment requirement is further reduced, the service life of the equipment is prolonged, and the production cost is reduced. On the other hand, the novel pressure swing adsorption nitrogen production device is provided with the first flow limiting pore plate, and because one adsorption tower is adsorbing, when the other adsorption tower regenerates, certain pressure difference exists between the two adsorption towers, gas in the adsorbed adsorption tower can be forced to pass through the first flow limiting pore plate and enter the regenerated adsorption tower at a certain flow rate, and then the adsorbent in the regenerated adsorption tower is purged, the regeneration of the catalyst can be further assisted, and the service life of the adsorbent is prolonged.
In addition, the first flow limiting hole has simple structure and lower cost, the aperture of the flow limiting hole is easy to control, and the control of accurate gas flow can be realized by adjusting the aperture only according to the gas yield of nitrogen, the filling amount of the adsorbent, the purity of the nitrogen and the like during debugging. Compared with valve control such as needle valve and stop valve, the precision that can improve gas flow by a wide margin avoids the air current too big to cause extravagant, and the air current is too little can't reach the purpose of supplementary adsorbent regeneration, and then leads to next circulation nitrogen output to reduce, and it can also avoid valve aperture skew and influence equipment precision in transit.
Drawings
FIG. 1 is a schematic diagram of a novel pressure swing adsorption nitrogen plant according to one embodiment;
FIG. 2 is a schematic view of a first restriction orifice plate in the novel pressure swing adsorption nitrogen making apparatus of FIG. 1;
FIG. 3 is a schematic diagram of a novel pressure swing adsorption nitrogen generation system in accordance with one embodiment.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention, and preferred embodiments of the present invention are set forth. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a novel pressure swing adsorption nitrogen generation apparatus 10 according to an embodiment of the present invention includes: the apparatus comprises a first adsorption tower 100, a second adsorption tower 200, a vacuum pump 300, a first restriction orifice 400, a gas supply machine 500, a nitrogen tank 600 and a valve group 700; the valve assembly 700 includes: a first intake valve 701, a second intake valve 702, a first exhaust valve 703, a second exhaust valve 704, a first exhaust valve 705, and a second exhaust valve 706.
It is to be understood that the first adsorption tower 100 and the second adsorption tower 200 are provided therein with adsorbents for adsorbing impurities, and the adsorbents may be conventional nitrogen-producing adsorbents such as carbon molecular sieves, etc., and are not particularly limited herein. The vacuum pump 300, the gas supply 500 and the nitrogen tank 600 may employ conventional apparatuses in the art, and are not particularly limited herein. In an embodiment, the air feeder 500 is a high-voltage variable frequency fan, and the investment cost and maintenance operation cost can be reduced by using the high-voltage variable frequency fan to provide larger air quantity under the same power.
The gas supply machine 500 supplies pressure to the first adsorption tower 100 and the second adsorption tower 200, and the pressure can be adjusted as needed. In one embodiment, the gas supply 500 provides a pressure of 0.2bar to 1bar. In addition, the pressures of the first adsorption tower 100, the second adsorption tower 200 and the nitrogen tank 600 are less than or equal to 1bar, and the manufacturing and maintenance costs can be reduced without performing the pressure vessel standard.
The gas inlet 101 of the first adsorption tower 100 is communicated with the gas supply machine 500 through a first gas inlet valve 701, the gas inlet 101 of the first adsorption tower 100 is communicated with the vacuum pump 300 through a first gas outlet valve 705, and the gas outlet 102 of the first adsorption tower 100 is communicated with the nitrogen tank 600 through a first gas outlet valve 703.
The gas inlet 201 of the second adsorption tower 200 is communicated with the gas supply machine 500 through a second gas inlet valve 702, the gas inlet 201 of the second adsorption tower 200 is communicated with the vacuum pump 300 through a second gas outlet valve 706, and the gas outlet of the second adsorption tower 200 is communicated with the nitrogen tank 600 through a second gas outlet valve 704.
It is understood that corresponding pipelines are arranged between the valves which are communicated with each other and between the valves and the devices which are communicated with the valves, and the materials of the pipelines and the caliber sizes of the pipelines can be arranged conventionally. In addition, each valve may be an electric control valve, a magnetic control valve, an electro-magnetic control valve, a pneumatic control valve, or the like, and is not particularly limited herein.
The first restriction orifice 400 is disposed between the first adsorption tower 100 and the second adsorption tower 200, and the air outlet 102 of the first adsorption tower 100 is communicated with the air outlet 202 of the second adsorption tower 200 through the first restriction orifice 400, when the first adsorption tower 100 adsorbs, the first restriction orifice 400 is used for assisting the regeneration of the adsorbent in the second adsorption tower 200, and when the second adsorption tower 200 adsorbs, the first restriction orifice 400 is used for assisting the regeneration of the adsorbent in the first adsorption tower 100.
Wherein, the first restriction orifice 400 may be detachably coupled between the first adsorption tower 100 and the second adsorption tower 200. Through adopting the mode of detachable connection, can conveniently change first restriction orifice 400 according to the nitrogen demand to guarantee the accurate regulation of air current. As shown in fig. 2, the first orifice 400 includes a base 401, and at least one orifice 402 is formed on the base, and the cross-sectional shape of the orifice is not particularly limited and may be any regular or irregular shape. In one embodiment, the first restriction orifice 400 is configured to: in the process of performing one adsorption in the first adsorption tower 100 or the second adsorption tower 200, the flow rate of the gas passing through the first restriction orifice 400 accounts for 3% -7% of the total amount of the produced gas, so that the maximum restriction promotes the regeneration of the adsorbent while avoiding the waste of the gas.
In one embodiment, the purity of the nitrogen is 99.5% and the flow rate of the nitrogen is 22m 3 Per hour-28 m 3 The gas flow rate per hour through the first restriction orifice 400 per unit time is: 0.70m 3 Per hour-0.80 m 3 And/or hours. In one embodiment, the purity of the nitrogen is 99.5% and the flow rate of the nitrogen is 25m 3 The gas flow rate per hour through the first restriction orifice 400 per unit time is: 0.75m 3 And/or hours.
In one embodiment, the flow limiting holes are circular holes, and the aperture and the number of the flow limiting holes can be adjusted according to the nitrogen gas yield, the adsorbent filling amount, the nitrogen purity and the like, so that the regeneration of the adsorbent is promoted while the waste of gas is avoided. In one embodiment, the orifice diameter is 0.9mm-1.3mm. In addition, when a plurality of restriction holes are formed in the first restriction hole plate 400, the arrangement manner of the restriction holes is not particularly limited.
The substrate 401 of the first orifice plate 400 may be made of any material. In one embodiment, the substrate 401 is a steel plate.
In addition, the valve train 700 further includes a first pressure equalizing valve 707 and a second pressure equalizing valve 708; the gas inlet 101 of the first adsorption tower 100 is communicated with the gas inlet 201 of the second adsorption tower 200 through a first pressure equalizing valve 707; the gas outlet 102 of the first adsorption tower 100 is communicated with the gas outlet 202 of the second adsorption tower 200 through a second pressure equalizing valve 708.
By providing the first pressure equalizing valve 707 and the second pressure equalizing valve 708, pressure equalizing between the first adsorption tower 100 and the second adsorption tower 200 can be achieved, the burden of the vacuum pump can be reduced while recovering part of the gas, and the production cost can be reduced while improving the purity of nitrogen.
In addition, a second restriction orifice plate 800 may be disposed between the gas inlet 101 of the first adsorption tower 100 and the gas inlet 201 of the second adsorption tower 200, and the second restriction orifice plate 800 is connected in series with the first pressure equalizing valve 707, and a third restriction orifice plate 900 may be disposed between the gas outlet 102 of the first adsorption tower 100 and the gas outlet 202 of the second adsorption tower 200, and the third restriction orifice plate 900 is connected in series with the second pressure equalizing valve 708.
It should be noted that, one or two of the second restriction orifice plate 800 and the third restriction orifice plate 900 may be optionally provided, which is not particularly limited herein. Through setting up second restriction orifice plate 800 and third restriction orifice plate 900, respectively with first equalizing valve 707 and second equalizing valve 708 cooperation, make the gas of one side adsorption tower stable get into in the other side adsorption tower, prevent that the air current from impacting too fast and influencing the adsorption of adsorbent, the adsorbent needs certain time when adsorbing gas generally, if get into the adsorption tower fast, can lead to low-purity nitrogen gas to get into the higher bed of adsorption tower, influence the adsorbent absorption next time. And only the aperture size and the number of the second current limiting orifice plate 800 and the third current limiting orifice plate 900 are required to be adjusted, so that the accurate adjustment of the airflow speed can be realized while the pressure equalization is realized, and the production cost is not required to be increased additionally. In addition, the problem of uneven air flow rate due to the valve shift of the first pressure equalizing valve 707 and the second pressure equalizing valve 708 can be avoided, and the frequency of performing calibration maintenance or the like on the pressure equalizing valves can be reduced.
In one embodiment, the flow rate of the gas passing through the second flow restricting orifice 800 and/or the third flow restricting orifice 900 during the primary adsorption of the first adsorption tower 100 or the second adsorption tower 200 is 2% to 10%, preferably 3% to 6% of the total amount of the produced gas.
The aperture and the number of the restriction holes of the second restriction hole plate 800 and the third restriction hole plate 900 may be adjusted according to the amount of nitrogen gas produced, the adsorbent loading amount, the purity of nitrogen gas, etc., so as to reduce the burden of the vacuum pump on the basis of avoiding gas waste. .
Additionally, the valve train 400 may further include: third exhaust valve 709 and fourth exhaust valve 710, third exhaust valve 709 and fourth exhaust valve 710 being connected in parallel with each other. Wherein, the third exhaust valve 709 is connected in series with the first exhaust valve 705 and the second exhaust valve 706, respectively, for exhausting the gas passing through the first exhaust valve 705 and the second exhaust valve 706 to the outside. The fourth exhaust valve 710 is connected in series with the first and second exhaust valves 705 and 706, respectively, for allowing the first and second adsorption columns 100 and 200 to communicate with the vacuum pump 300 through the first and second exhaust valves 705 and 706, respectively. The fourth exhaust valve 710 may be a pneumatic valve, and is not particularly limited herein.
By providing the third exhaust valve 709 for communicating with the outside and the fourth exhaust valve 710 for communicating with the vacuum pump 300, the adsorption tower can be communicated with the outside before the vacuum pump 300 is started, the pressure is reduced to a certain value and then communicated with the vacuum pump 300, the burden of the vacuum pump 300 can be effectively reduced, the service life of the vacuum pump 300 is prolonged, and the maintenance cost is reduced.
Further, the valve group 400 may further include a third air outlet valve 711 and a fourth air outlet valve 712, the third air outlet valve 711 being connected in series with the first air outlet valve 703 and the second air outlet valve 704, respectively, for controlling the air discharged from the first air outlet valve 703 or the second air outlet valve 704 to enter the nitrogen tank 600. A fourth gas outlet valve 712 is provided at the gas outlet of the nitrogen tank 600 for discharging the gas in the nitrogen tank 600 to a desired space.
In addition, a flow meter may be provided between the valves for monitoring the air flow. In one embodiment, a flow meter 1000 is disposed between the third outlet valve 711 and the nitrogen tank 600. The low-pressure air passes through the first adsorption tower 100 or the second adsorption tower 200, the nitrogen output flow is controlled by controlling each valve, the flow rate of the air passing through the adsorption towers is reduced, certain pressure (0.2-0.8 bar, the pressure is regulated according to the requirement) in the first adsorption tower 100 or the second adsorption tower 200 is ensured to pass through the flowmeter 1000, the air enters the nitrogen tank 600, the external nitrogen supply flow is controlled by the fourth air outlet valve 712, and the nitrogen tank 600 is ensured to have certain positive pressure.
The number of the valves having the same function is not particularly limited, and two or more valves having the same function may be connected in series according to actual needs to improve the control accuracy of the air flow.
The novel pressure swing adsorption nitrogen making device 10 adopts the vacuum pump 300 to control the pressure in the first adsorption tower 100 and the second adsorption tower 200 on one hand, assists in the regeneration of the adsorbent, improves the adsorption efficiency of the adsorbent, reduces the adsorption pressure of the system, further reduces the equipment requirement, prolongs the service life of the equipment and reduces the production cost. On the other hand, the novel pressure swing adsorption nitrogen making device 10 is provided with the first flow limiting orifice plate 400, because a certain pressure difference exists between two adsorption towers when one adsorption tower is adsorbing and the other adsorption tower is regenerating, the gas in the adsorbed adsorption tower can be forced to pass through the first flow limiting orifice plate 400, nitrogen enters the regenerated adsorption tower at a certain flow rate by utilizing the flow limiting effect of the first flow limiting orifice plate 400, and then the adsorbent in the regenerated adsorption tower is purged, so that the adsorbent can desorb oxygen as much as possible, more oxygen can be adsorbed in the next adsorption period, and the service life of the adsorbent is prolonged.
In addition, the first flow limiting orifice plate 400 has a simple structure, low cost and easily controlled aperture, and can realize accurate gas flow control by adjusting the aperture only according to nitrogen yield, adsorbent loading, nitrogen purity and the like during debugging. Compared with valve control such as needle valve and stop valve, the precision that can improve gas flow by a wide margin avoids the air current too big to cause extravagant, and the air current is too little can't reach the purpose of supplementary adsorbent regeneration, and then leads to next circulation nitrogen output to reduce, and it can also avoid valve aperture skew and influence equipment precision in transit.
The novel pressure swing adsorption nitrogen making device 10 works at lower pressure (less than or equal to 1 bar), so that the equipment requirement can be reduced, and the manufacturing and maintenance cost can be reduced.
The method for preparing nitrogen according to one embodiment of the invention comprises the following steps:
s101: air feed, in particular: the gas supply 500 is turned on to supply compressed gas to the system.
In one embodiment, the air supply machine is a high-pressure variable frequency fan, and the air pressure is 0.2-1bar. The frequency of the fan can be adjusted according to the requirement to provide gases with different pressures and air volumes. The gas source can be the atmosphere or a closed space such as a storage room.
The first adsorption tower 100 adsorbs, and the second adsorption tower 200 regenerates, specifically comprising the following steps:
(1) The first inlet valve 701 and the first outlet valve 703 are opened to allow the first adsorption tower 100 to adsorb. Simultaneously, the second vent valve 706 and the third vent valve 709 are opened, and the fourth vent valve 710 is closed, so that the pressure in the second adsorption tower 200 is reduced to 0bar.
(2) Closing the third exhaust valve 709 and opening the fourth exhaust valve 710 can reduce the load of the vacuum pump 300 and extend the service life of the vacuum pump 300 since the pressure in the second adsorption tower 200 is 0bar. The vacuum pump 300 is turned on to reduce the pressure in the second adsorption tower 100 to less than or equal to-0.85 bar, and the second adsorption tower 100 is regenerated.
It is understood that the third exhaust valve 709 in step (1) may be omitted and the fourth exhaust valve 710 may be directly opened. Because the third exhaust valve 709 is provided, the pressure of the second adsorption tower 200 can be reduced to 0bar, the pressure of the gas entering the vacuum pump can be reduced, the load of the vacuum pump 300 can be reduced, the service life of the vacuum pump can be prolonged, and the maintenance cost of the vacuum pump can be reduced.
(3) After the regeneration is completed, the first intake valve 701, the first exhaust valve 703, and the second exhaust valve 706 are closed.
S102: the pressure equalizing method specifically comprises the following steps:
the first pressure equalizing valve 707 and the second pressure equalizing valve 708 are opened to equalize the air pressures in the first adsorption column 100 and the second adsorption column 200.
It can be understood that the step S102 may be omitted to directly perform the adsorption in the second adsorption tower 200, the step of regenerating the first adsorption tower 100 may be omitted, and a part of the gas may be recovered through the step of equalizing pressure, thereby further reducing the production cost.
S103: air feed, in particular: and starting a gas supply machine to supply gas.
This step is step S101, and will not be described in detail here.
The second adsorption tower 200 adsorbs, and the first adsorption tower 100 regenerates, specifically comprising the following steps:
(1) The second inlet valve 702 and the second outlet valve 704 are opened to allow the second adsorption column 200 to adsorb. Simultaneously, the first exhaust valve 705 and the third exhaust valve 709 are opened, and the fourth exhaust valve 710 is closed, so that the pressure in the first adsorption tower 100 is reduced to 0bar.
(2) The third exhaust valve 709 is closed and then the fourth exhaust valve 710 is opened, and since the pressure in the first adsorption tower 100 is 0bar, the load of the vacuum pump 300 can be reduced, and the service life of the vacuum pump 300 can be prolonged. The vacuum pump 300 is turned on to reduce the pressure in the first adsorption tower 100 to less than or equal to-0.85 bar, and the first adsorption tower 100 is regenerated.
It is understood that the third exhaust valve 709 in step (1) may be omitted and the fourth exhaust valve 710 may be directly opened. Because the third exhaust valve 709 is provided, the pressure of the first adsorption tower 100 can be reduced to 0bar, the pressure of the gas entering the vacuum pump can be reduced, the load of the vacuum pump 300 can be reduced, the service life of the vacuum pump can be prolonged, and the maintenance cost of the vacuum pump can be reduced.
(3) After the regeneration is completed, the second intake valve 702, the second exhaust valve 704, and the first exhaust valve 705 are closed.
S104: the first pressure equalizing valve 707 and the second pressure equalizing valve 708 are opened to equalize the air pressures in the first adsorption column 100 and the second adsorption column 200.
The step is the same as step S102, and will not be described here again.
S105: the steps S101-S104 are sequentially and circularly performed for n times, wherein n is an integer greater than or equal to 0.
The repeated circulation can continuously prepare nitrogen.
The valve opening/closing conditions in the respective steps of the above embodiments are shown in table 1.
Note that: in table 1, OFF represents OFF and ON represents ON.
As shown in fig. 2, the novel pressure swing adsorption nitrogen production system according to an embodiment of the present invention includes the novel pressure swing adsorption nitrogen production apparatus 10 and the airtight space 20, wherein the gas supply machine 500 of the novel pressure swing adsorption nitrogen production apparatus 10 is communicated with the gas outlet of the airtight space 20, and the nitrogen tank 600 of the novel pressure swing adsorption nitrogen production apparatus 10 is communicated with the gas inlet of the airtight space 20.
The closed space 20 is a storage room or the like, such as a food fresh-keeping shop, which needs to supply nitrogen. Through with airtight space 20 and novel pressure swing adsorption nitrogen making device 10 intercommunication, make the gas in the airtight space 20 get into novel pressure swing adsorption nitrogen making device 10 through air feeder 500, the nitrogen gas that novel pressure swing adsorption nitrogen making device 10 produced gets into airtight space 20 through nitrogen jar 600, form a cyclic process, so relapse, not only guarantee airtight space 20 to the demand of nitrogen gas, novel pressure swing adsorption nitrogen making device 10 constantly replace the air in the airtight space simultaneously, when the device operating time is longer and longer, nitrogen gas concentration in the airtight space 20 is higher and higher, the nitrogen gas purity of compressed air that air feeder 500 provided is also higher and higher, when making equal flow nitrogen gas, novel pressure swing adsorption nitrogen making device 10 produces nitrogen purity and just is higher, namely produce nitrogen flow and be higher.
The novel pressure swing adsorption nitrogen making device 10 has the same structure and connection manner as described above, and will not be described in detail herein.
In an embodiment, the novel pressure swing adsorption nitrogen making system further includes a third air inlet valve 713 and a fourth air inlet valve 714, wherein the third air inlet valve 713 is disposed between the air supply machine 500 and the air outlet of the enclosed space 20, and is used for controlling the air in the enclosed space 20 to enter the air supply machine 500. The fourth air intake valve 714 is connected in parallel with the third air intake valve 713 for controlling the intake of outside air into the air supply 500.
The pressure in the enclosed space 20 is ensured by the cooperation of the third intake valve 713 and the fourth intake valve 714. For example, the third intake valve 713 and the fourth intake valve 714 are interlocked, and when the third intake valve 713 is opened, the fourth intake valve 714 is closed; when the fourth intake valve 714 is closed, the third intake valve 713 is opened, so that the minimum pressure and the maximum pressure in the enclosed space 20 are ensured by controlling the opening and closing times of the third intake valve 713 and the fourth intake valve 714, so that the flow rate of nitrogen gas into the enclosed space 20 is equal to the flow rate to the gas supply machine 500 through the third intake valve 713. Therefore, the opening time of the third intake valve 713 and the fourth intake valve 714 may be adjusted by presetting the pressure in the closed space 20, thereby realizing the automatic control.
The novel nitrogen production method of the pressure swing adsorption nitrogen production system in the embodiment of the invention comprises the following steps:
s201: air feed, in particular: the third air inlet valve 713 or the fourth air inlet valve 714 is selectively opened according to the pressure condition in the closed space 20, so that the air in the closed space or the outside passes through the air feeder 500, and the air with a certain pressure is supplied by the action of the air feeder 50.
In one embodiment, the air supply machine is a high-pressure variable frequency fan, and the air pressure is 0.2-1bar. The frequency of the fan can be adjusted according to the requirement to provide gases with different pressures and air volumes. The gas source can be the atmosphere or a closed space such as a storage room.
The first adsorption tower 100 adsorbs, and the second adsorption tower 200 regenerates, specifically comprising the following steps:
(1) The first inlet valve 701 and the first outlet valve 703 are opened to allow the first adsorption tower 100 to adsorb. Simultaneously, the second vent valve 706 and the third vent valve 709 are opened, and the fourth vent valve 710 is closed, so that the pressure in the second adsorption tower 200 is reduced to 0bar.
(2) Closing the third exhaust valve 709 and opening the fourth exhaust valve 710 can reduce the load of the vacuum pump 300 and extend the service life of the vacuum pump 300 since the pressure in the second adsorption tower 200 is 0bar. The vacuum pump 300 is turned on to reduce the pressure in the second adsorption tower 100 to less than or equal to-0.85 bar, and the second adsorption tower 100 is regenerated.
It is understood that the third exhaust valve 709 in step (1) may be omitted and the fourth exhaust valve 710 may be directly opened. Because the third exhaust valve 709 is provided, the pressure of the second adsorption tower 200 can be reduced to 0bar, the pressure of the gas entering the vacuum pump can be reduced, the load of the vacuum pump 300 can be reduced, the service life of the vacuum pump can be prolonged, and the maintenance cost of the vacuum pump can be reduced.
(3) After the regeneration is completed, the first intake valve 701, the first exhaust valve 703, and the second exhaust valve 706 are closed.
S202: the pressure equalizing method specifically comprises the following steps:
the first pressure equalizing valve 707 and the second pressure equalizing valve 708 are opened to equalize the air pressures in the first adsorption column 100 and the second adsorption column 200.
It can be understood that the step S202 may be omitted to directly perform the adsorption in the second adsorption tower 200, the step of regenerating the first adsorption tower 100 may be omitted, and a part of the gas may be recovered through the step of equalizing pressure, thereby further reducing the production cost.
S203: air feed, in particular:
the third air inlet valve 713 or the fourth air inlet valve 714 is selectively opened according to the pressure condition in the closed space 20, so that the air in the closed space or the outside passes through the air feeder 500, and the air with a certain pressure is supplied by the action of the air feeder 50.
This step is step S201, and will not be described in detail herein.
The second adsorption tower 200 adsorbs, and the first adsorption tower 100 regenerates, specifically comprising the following steps:
(1) The second inlet valve 702 and the second outlet valve 704 are opened to allow the second adsorption column 200 to adsorb. Simultaneously, the first exhaust valve 705 and the third exhaust valve 709 are opened, and the fourth exhaust valve 710 is closed, so that the pressure in the first adsorption tower 100 is reduced to 0bar.
(2) The third exhaust valve 709 is closed and then the fourth exhaust valve 710 is opened, and since the pressure in the first adsorption tower 100 is 0bar, the load of the vacuum pump 300 can be reduced, and the service life of the vacuum pump 300 can be prolonged. The vacuum pump 300 is turned on to reduce the pressure in the first adsorption tower 100 to less than or equal to-0.85 bar, and the first adsorption tower 100 is regenerated.
It is understood that the third exhaust valve 709 in step (1) may be omitted and the fourth exhaust valve 710 may be directly opened. Because the third exhaust valve 709 is provided, the pressure of the first adsorption tower 100 can be reduced to 0bar, the pressure of the gas entering the vacuum pump can be reduced, the load of the vacuum pump 300 can be reduced, the service life of the vacuum pump can be prolonged, and the maintenance cost of the vacuum pump can be reduced.
(3) After the regeneration is completed, the second intake valve 702, the second exhaust valve 704, and the first exhaust valve 705 are closed.
S204: the first pressure equalizing valve 707 and the second pressure equalizing valve 708 are opened to equalize the air pressures in the first adsorption column 100 and the second adsorption column 200.
This step is the same as step S202 and will not be described here again.
S205: the steps S201 to S204 are sequentially and circularly performed n times, wherein n is an integer greater than or equal to 0.
The repeated circulation can continuously prepare nitrogen. When the novel pressure swing adsorption nitrogen making device 10 is operated for a longer time, the nitrogen concentration in the closed space 20 is higher and higher, the nitrogen purity of the compressed gas provided by the gas supply machine is higher and higher, and when the nitrogen with the same flow is manufactured, the purity of the nitrogen generated by the novel pressure swing adsorption nitrogen making device is higher, namely the nitrogen flow is higher.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A novel pressure swing adsorption nitrogen generation device, comprising: the device comprises a first adsorption tower, a second adsorption tower, a vacuum pump, a first flow limiting orifice plate, a gas supply machine, a nitrogen tank and a valve group; the valve group includes: the device comprises a first air inlet valve, a second air inlet valve, a first air outlet valve, a second air outlet valve, a first exhaust valve and a second exhaust valve;
the air inlet of the first adsorption tower is communicated with the air supply machine through the first air inlet valve, the air inlet of the first adsorption tower is communicated with the vacuum pump through the first air outlet valve, and the air outlet of the first adsorption tower is communicated with the nitrogen tank through the first air outlet valve;
the air inlet of the second adsorption tower is communicated with the air supply machine through the second air inlet valve, the air inlet of the second adsorption tower is communicated with the vacuum pump through the second air outlet valve, and the air outlet of the second adsorption tower is communicated with the nitrogen tank through the second air outlet valve;
the first current limiting orifice plate is arranged between the first adsorption tower and the second adsorption tower, the air outlet of the first adsorption tower is communicated with the air outlet of the second adsorption tower through the first current limiting orifice plate, when the first adsorption tower adsorbs, the first current limiting orifice plate is used for assisting in regeneration of the adsorbent in the second adsorption tower, and when the second adsorption tower adsorbs, the first current limiting orifice plate is used for assisting in regeneration of the adsorbent in the first adsorption tower.
2. The novel pressure swing adsorption nitrogen making apparatus according to claim 1, wherein the first restriction orifice plate is detachably connected between the first adsorption tower and the second adsorption tower; and the first restriction orifice plate is configured to: in the process of carrying out primary adsorption on the first adsorption tower or the second adsorption tower, the flow of the gas passing through the first current limiting orifice plate accounts for 3-7% of the total amount of the produced gas.
3. The novel pressure swing adsorption nitrogen plant according to claim 2, wherein the valve train further comprises a first pressure equalizing valve and a second pressure equalizing valve; the air inlet of the first adsorption tower is communicated with the air inlet of the second adsorption tower through the first pressure equalizing valve; the air outlet of the first adsorption tower is communicated with the air outlet of the second adsorption tower through the second pressure equalizing valve.
4. The novel pressure swing adsorption nitrogen making device according to claim 3, wherein a second flow limiting orifice plate is arranged between the air inlet of the first adsorption tower and the air inlet of the second adsorption tower, and the second flow limiting orifice plate is connected in series with the first pressure equalizing valve; and/or
A third flow limiting orifice plate is arranged between the air outlet of the first adsorption tower and the air outlet of the second adsorption tower, and the third flow limiting orifice plate is connected with the second pressure equalizing valve in series.
5. The novel pressure swing adsorption nitrogen plant according to any of claims 1 to 4, wherein said valve train further comprises: a third exhaust valve and a fourth exhaust valve, the third exhaust valve and the fourth exhaust valve being connected in parallel with each other;
the third exhaust valve is respectively connected in series with the first exhaust valve and the second exhaust valve and is used for exhausting the gas passing through the first exhaust valve and the second exhaust valve to the outside;
the fourth exhaust valve is respectively connected with the first exhaust valve and the second exhaust valve in series and is used for enabling the first adsorption tower to be communicated with the vacuum pump through the first exhaust valve and enabling the second adsorption tower to be communicated with the vacuum pump through the second exhaust valve.
6. A method for producing nitrogen using the novel pressure swing adsorption nitrogen production apparatus as claimed in any one of claims 1 to 5, comprising the steps of:
step (1): starting the gas supply machine to supply gas;
step (2): opening the first air inlet valve and the first air outlet valve to enable the first adsorption tower to adsorb; opening the second exhaust valve, starting the vacuum pump, reducing the pressure in the second adsorption tower to less than or equal to-0.85 bar, and regenerating the second adsorption tower; closing the first air inlet valve, the first air outlet valve and the second air outlet valve;
step (3): starting the gas supply machine to supply gas;
step (4): opening the second air inlet valve and the second air outlet valve to enable the second adsorption tower to adsorb; opening the first exhaust valve, starting the vacuum pump, reducing the pressure in the first adsorption tower to less than or equal to-0.85 bar, and regenerating the first adsorption tower; closing the second inlet valve, the second outlet valve and the first outlet valve;
step (5): and (3) sequentially and circularly carrying out the steps from the step (1) to the step (4) for n times, wherein n is an integer greater than or equal to 0.
7. The method of producing nitrogen according to claim 6, further comprising the steps of, after opening said second exhaust valve, before opening said vacuum pump:
opening the third exhaust valve, closing the fourth exhaust valve, reducing the pressure in the second adsorption tower, closing the third exhaust valve, opening the fourth exhaust valve, and communicating the second adsorption tower with the vacuum pump; and/or
After opening the first exhaust valve, before opening the vacuum pump, the method further comprises the following steps:
and opening the third exhaust valve, closing the fourth exhaust valve, reducing the pressure in the first adsorption tower, closing the third exhaust valve, opening the fourth exhaust valve, and communicating the first adsorption tower with the vacuum pump.
8. The method of producing nitrogen according to claim 6, wherein after said step of closing said first intake valve, said first exhaust valve and said second exhaust valve, said second intake valve and said second exhaust valve are opened, and further comprising, before said step of adsorbing said second adsorption tower, the steps of:
and opening the first pressure equalizing valve and the second pressure equalizing valve to balance the air pressure in the first adsorption tower and the second adsorption tower.
9. A novel pressure swing adsorption nitrogen making system, which is characterized by comprising the novel pressure swing adsorption nitrogen making device and a closed space according to any one of claims 1-5, wherein the air feeder of the novel pressure swing adsorption nitrogen making device is communicated with the air outlet of the closed space, and the nitrogen tank of the novel pressure swing adsorption nitrogen making device is communicated with the air inlet of the closed space.
10. The novel pressure swing adsorption nitrogen making system according to claim 9, further comprising a third air inlet valve and a fourth air inlet valve, the third air inlet valve being disposed between the air supply and the air outlet of the enclosed space for controlling the air in the enclosed space to enter the air supply;
the fourth air inlet valve is connected with the third air inlet valve in parallel and is used for controlling external air to enter the air supply machine.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203737071U (en) * | 2014-03-24 | 2014-07-30 | 九江中科鑫星新材料有限公司 | Novel pressure swing adsorption device |
| CN204848274U (en) * | 2015-07-27 | 2015-12-09 | 大连力德气体分离技术有限公司 | System for high -purity nitrogen gas is got to two sections legal systems |
| CN209957385U (en) * | 2019-04-23 | 2020-01-17 | 池州山立分子筛有限公司 | Novel pressure swing adsorption nitrogen making device and nitrogen making system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203737071U (en) * | 2014-03-24 | 2014-07-30 | 九江中科鑫星新材料有限公司 | Novel pressure swing adsorption device |
| CN204848274U (en) * | 2015-07-27 | 2015-12-09 | 大连力德气体分离技术有限公司 | System for high -purity nitrogen gas is got to two sections legal systems |
| CN209957385U (en) * | 2019-04-23 | 2020-01-17 | 池州山立分子筛有限公司 | Novel pressure swing adsorption nitrogen making device and nitrogen making system |
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