CN209957385U

CN209957385U - Novel pressure swing adsorption nitrogen making device and nitrogen making system

Info

Publication number: CN209957385U
Application number: CN201920557816.2U
Authority: CN
Inventors: 胡耀明; 汤历斌; 吕海松; 柯晓丽
Original assignee: Chizhou Shanli Molecular Sieve Co Ltd
Current assignee: Chizhou Shanli Molecular Sieve Co Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-01-17
Anticipated expiration: 2029-04-23

Abstract

The utility model relates to a novel pressure swing adsorption nitrogen generation device and nitrogen generation system. The novel pressure swing adsorption nitrogen making device comprises a first adsorption tower, a second adsorption tower, a vacuum pump, a first flow limiting pore plate, an air feeder, a nitrogen tank and a valve group. The first flow limiting pore plate is arranged between the first adsorption tower and the second adsorption tower, the gas outlet of the first adsorption tower is communicated with the gas outlet of the second adsorption tower through the first flow limiting pore plate, when the first adsorption tower is used for adsorption, the first flow limiting pore plate is used for assisting regeneration of an adsorbent in the second adsorption tower, and when the second adsorption tower is used for adsorption, the first flow limiting pore plate is used for assisting regeneration of the adsorbent in the first adsorption tower. Above-mentioned novel pressure swing adsorption nitrogen generator can realize the accurate control of air current between the adsorption tower, and supplementary adsorbent regeneration, and whole system pressure is lower, can reduction in production cost.

Description

Novel pressure swing adsorption nitrogen making device and nitrogen making system

Technical Field

The utility model relates to a gaseous preparation technical field especially relates to novel pressure swing adsorption nitrogen generation device and nitrogen generation system.

Background

The basic principle of pressure swing adsorption is to utilize the characteristic that the adsorbent has different adsorption capacities under different pressures for adsorbates and has selective adsorption for each component of the separated gas mixture under a certain pressure. Under the condition of selective adsorption of adsorbent, the impurity components in the raw material can be removed by pressure adsorption, and the adsorbent can be regenerated by removing these impurities by pressure reduction, so that the nitrogen gas in the air can be separated and used for preparing nitrogen gas. However, the air pressure required in the existing pressure swing adsorption nitrogen production field is high (more than or equal to 0.5MPa), and a set of novel pressure swing adsorption nitrogen production system usually needs equipment such as an air compressor, a cold dryer, a three-stage filter, an air storage tank, two adsorption towers and a nitrogen storage tank, and the air compressor has high operation cost. And the compressor accessories, the filter, the air storage tank, the nitrogen storage tank and the adsorption tower need to be replaced regularly, and the pressure container detection needs to be performed regularly, so that the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a novel pressure swing adsorption nitrogen generation apparatus and a nitrogen generation system, which are directed to the problem of how to reduce the nitrogen generation cost.

A novel pressure swing adsorption nitrogen making device comprises: the device comprises a first adsorption tower, a second adsorption tower, a vacuum pump, a first flow limiting pore plate, an air supply machine, a nitrogen tank and a valve group; the valve group includes: the first air inlet valve, the second air inlet valve, the first air outlet valve, the second air outlet valve, the first exhaust valve and the second exhaust valve;

the air inlet of the first adsorption tower is communicated with the air feeder 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 feeder through the second air inlet valve, the air inlet of the second adsorption tower is communicated with the vacuum pump through the second exhaust valve, and the air outlet of the second adsorption tower is communicated with the nitrogen tank through the second air outlet valve;

the first flow limiting orifice plate is arranged between the first adsorption tower and the second adsorption tower, the gas outlet of the first adsorption tower is communicated with the gas outlet of the second adsorption tower through the first flow limiting orifice plate, when the first adsorption tower adsorbs, the first flow limiting orifice plate is used for assisting the regeneration of the adsorbent in the second adsorption tower, and when the second adsorption tower adsorbs, the first flow limiting orifice plate is used for assisting the regeneration of the adsorbent in the first adsorption tower.

In one embodiment, the first restriction orifice is detachably connected between the first adsorption column and the second adsorption column.

In one embodiment, the first restriction orifice plate is configured to: and in the process of performing primary adsorption on the first adsorption tower or the second adsorption tower, the flow of the gas passing through the first limiting orifice plate accounts for 3-7% of the total amount of the prepared gas.

In one embodiment, the valve set further comprises a first pressure equalizing valve and a second pressure equalizing valve; the gas inlet of the first adsorption tower is communicated with the gas inlet of the second adsorption tower through the first pressure equalizing valve; and the gas outlet of the first adsorption tower is communicated with the gas 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 gas inlet of the first adsorption tower and the gas inlet of the second adsorption tower, and the second flow-limiting orifice plate is connected with the first pressure equalizing valve in series.

In one embodiment, 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 set 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 with the first exhaust valve and the second exhaust valve in series and is used for exhausting the gas passing through the first exhaust valve and the second exhaust valve to the outside;

and the fourth exhaust valve is respectively connected with the first exhaust valve and the second exhaust valve in series and is used for communicating the first adsorption tower with the vacuum pump through the first exhaust valve and communicating the second adsorption tower with the vacuum pump through the second exhaust valve.

In one embodiment, the air feeder is a high-voltage variable-frequency fan.

The utility model provides a novel pressure swing adsorption nitrogen system, includes foretell novel pressure swing adsorption nitrogen generation device and airtight space, novel pressure swing adsorption nitrogen generation device the air supply machine with the gas outlet intercommunication in airtight space, novel pressure swing adsorption nitrogen generation device the nitrogen gas jar with the air inlet intercommunication in airtight space.

In one embodiment, the novel pressure swing adsorption nitrogen making system further comprises a third gas inlet valve and a fourth gas inlet valve, wherein the third gas inlet valve is arranged between the gas supply machine and the gas outlet of the closed space and is used for controlling gas in the closed space to enter the gas supply machine;

and the fourth air inlet valve is connected with the third air inlet valve in parallel and is used for controlling the outside air to enter the air feeder.

Above-mentioned novel pressure swing adsorption nitrogen generator adopts the vacuum pump to control first adsorption tower and second adsorption tower internal pressure on the one hand, and supplementary adsorbent regeneration improves adsorbent adsorption efficiency, reduces system's pressure, and then reduces equipment requirement, extension equipment life, reduction in production cost. On the other hand, the novel pressure swing adsorption nitrogen making device is provided with the first flow limiting pore plate, and because one adsorption tower is used for adsorption, when the other adsorption tower is regenerated, a 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 then enters the regenerated adsorption tower at a certain flow speed, so that the adsorbent in the regenerated adsorption tower is swept, the regeneration of a catalyst can be further assisted, and the service life of the adsorbent is prolonged.

In addition, first restricted aperture plate simple structure, the cost is lower, and the aperture is easier to control, only needs to adjust the aperture when the debugging according to nitrogen gas production, adsorbent packing volume, nitrogen gas purity etc. can realize accurate gas flow's control. Compared with valve control such as a needle valve and a stop valve, the device can greatly improve the precision of gas flow, avoid waste caused by overlarge gas flow, avoid the purpose that auxiliary adsorbent regeneration cannot be achieved due to undersize gas flow, further reduce the yield of next cycle nitrogen, and avoid the influence on the precision of the device caused by the deviation of the opening degree of the valve in the transportation process.

Drawings

FIG. 1 is a schematic view of a novel pressure swing adsorption nitrogen plant according to one embodiment;

FIG. 2 is a schematic view of a first restriction orifice in the novel pressure swing adsorption nitrogen plant of FIG. 1;

fig. 3 is a schematic view of a novel pressure swing adsorption nitrogen generation system according to an embodiment.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully below, and preferred embodiments of the present invention will be described. The 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" 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 generator 10 according to an embodiment of the present invention includes: a first adsorption tower 100, a second adsorption tower 200, a vacuum pump 300, a first restriction orifice 400, an air feeder 500, a nitrogen tank 600 and a valve group 700; the valve group 700 includes: a first inlet valve 701, a second inlet valve 702, a first outlet valve 703, a second outlet valve 704, a first outlet valve 705, and a second outlet valve 706.

It is 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 existing nitrogen-making adsorbents such as carbon molecular sieves, and are not particularly limited herein. The vacuum pump 300, the air feeder 500 and the nitrogen gas tank 600 may employ conventional apparatuses in the art, and are not particularly limited thereto. In an embodiment, the air feeder 500 is a high voltage variable frequency blower, and the high voltage variable frequency blower can provide a larger air volume under the same power, so that the investment cost and the maintenance operation cost can be reduced.

The air supplier 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 air feeder 500 provides a pressure of 0.2bar to 1 bar. In addition, the pressure in the first adsorption tower 100, the second adsorption tower 200 and the nitrogen tank 600 is less than or equal to 1bar, and the manufacturing and maintenance cost can be reduced without executing the standard of a pressure vessel.

The gas inlet 101 of the first adsorption tower 100 communicates with the gas supplier 500 through a first gas inlet valve 701, the gas inlet 101 of the first adsorption tower 100 communicates with the vacuum pump 300 through a first gas outlet valve 705, and the gas outlet 102 of the first adsorption tower 100 communicates 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 supplier 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 can be understood that corresponding pipelines are arranged between the mutually communicated valves and between the valves and the equipment communicated with the valves, and the materials and the calibers of the pipelines can be set conventionally. In addition, each valve can adopt an electric control valve, a magnetic control valve, an electro-magnetic control valve, a pneumatic control valve and 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 gas outlet 102 of the first adsorption tower 100 is communicated with the gas outlet 202 of the second adsorption tower 200 through the first restriction orifice 400, and when the first adsorption tower 100 adsorbs, the first restriction orifice 400 is used to assist 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 to assist the regeneration of the adsorbent in the first adsorption tower 100.

Wherein, the first restriction orifice 400 may be detachably connected between the first adsorption tower 100 and the second adsorption tower 200. Through adopting the mode of can dismantling the connection, can conveniently change first restriction orifice plate 400 according to the nitrogen making demand to guarantee the accurate regulation of air current. As shown in fig. 2, the first restriction orifice plate 400 includes a base 401 having at least one restriction orifice 402 formed therein, and the cross-sectional shape of the restriction orifice is not particularly limited, and may be any regular or irregular shape. In one embodiment, the first restriction orifice plate 400 is configured to: in the process of performing primary 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 adsorbent regeneration is maximally promoted while the gas waste is avoided.

In one embodiment, the nitrogen production purity is 99.5%, and the nitrogen production flow rate is 22m³Hour-28 m³The gas flow rate per unit time through the first restriction orifice 400 is: 0.70m³Hour-0.80 m³In terms of hours. In one embodiment, the nitrogen production purity is 99.5%, and the nitrogen production flow rate is 25m³The gas flow rate per unit time through the first restriction orifice 400 is: 0.75m³In terms of hours.

In one embodiment, the flow restriction holes are circular, and the hole diameter and the number of the flow restriction holes can be adjusted according to the nitrogen gas production rate, the adsorbent filling amount, the nitrogen gas purity and the like, so that the regeneration of the adsorbent is promoted while the waste of gas is avoided. In one embodiment, the restrictor orifice has a diameter of 0.9mm to 1.3 mm. In addition, when the first orifice plate 400 has a plurality of orifices, the arrangement of the orifices is not particularly limited.

The base 401 of the first orifice restriction 400 may be made of any suitable material. In one embodiment, the substrate 401 is a steel plate.

In addition, the valve block 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.

The pressure equalization of the first adsorption tower 100 and the second adsorption tower 200 can be realized by arranging the first pressure equalizing valve 707 and the second pressure equalizing valve 708, the burden of a vacuum pump is reduced while part of gas is recovered, and the production cost is reduced while the nitrogen purity is improved.

Further, a second restriction orifice 800 may be provided 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 800 is connected in series with the first pressure equalizing valve 707, and a third restriction orifice 900 may be provided 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 900 is connected in series with the second pressure equalizing valve 708.

It should be noted that one or two second restriction orifice plates 800 and/or third restriction orifice plates 900 may be optionally provided, and are not particularly limited herein. Through setting up second restriction orifice plate 800 and third restriction orifice plate 900, cooperate with first pressure equalizing valve 707 and second pressure equalizing valve 708 respectively, make during the stable entering other side adsorption tower of gas of one side adsorption tower, prevent that the air current from assaulting too fast and influencing the adsorption of adsorbent, adsorbent needs certain time when adsorbing gas usually, if get into the adsorption tower fast, can lead to low-purity nitrogen gas to get into the higher bed of adsorption tower, influence next adsorbent and adsorb. And the air flow velocity can be accurately adjusted while pressure equalization only by adjusting the aperture size and the number of the second restriction orifice plate 800 and the third restriction orifice plate 900, without additionally increasing the production cost. In addition, the problem of non-uniform gas flow velocity caused by valve offset of the first pressure equalizing valve 707 and the second pressure equalizing valve 708 can be avoided, and the frequency of performing calibration maintenance and the like on the pressure equalizing valves can be reduced.

In one embodiment, during the first adsorption tower 100 or the second adsorption tower 200 performing the first adsorption, the flow rate of the gas passing through the second restriction orifice 800 and/or the third restriction orifice 900 is 2% to 10%, preferably 3% to 6%, of the total amount of the produced gas.

The aperture and number of the restricting orifices of the second restricting orifice plate 800 and the third restricting orifice plate 900 can be adjusted according to the nitrogen gas production rate, the adsorbent packing amount, the nitrogen gas purity, etc., so as to reduce the burden of the vacuum pump on the basis of avoiding gas waste.

In addition, the valve group 400 may further include: a third exhaust valve 709 and a fourth exhaust valve 710, the third exhaust valve 709 and the fourth exhaust valve 710 being connected in parallel with each other. Wherein, the third exhaust valve 709 is respectively connected in series with the first exhaust valve 705 and the second exhaust valve 706, for exhausting the gas passing through the first exhaust valve 705 and the second exhaust valve 706 to the outside. The fourth purge valve 710 is connected in series with the first and second purge valves 705 and 706, respectively, for communicating the first and

second adsorption columns

100 and 200 with the vacuum pump 300 through the first and second purge valves 705 and 706, respectively. The fourth exhaust valve 710 may be a pneumatic valve, and is not particularly limited herein.

Through setting up the third discharge valve 709 that is used for with external intercommunication and the fourth discharge valve 710 that communicates with vacuum pump 300, can communicate adsorption tower and external before starting vacuum pump 300, with communicating with vacuum pump 300 again after the pressure drop to a definite value, can reduce vacuum pump 300's burden effectively, improve vacuum pump 300's life, reduce cost of maintenance.

Moreover, the valve set 400 may further include a third gas outlet valve 711 and a fourth gas outlet valve 712, where the third gas outlet valve 711 is connected in series with the first gas outlet valve 703 and the second gas outlet valve 704, respectively, and is used to control the gas exhausted from the first gas outlet valve 703 or the second gas outlet valve 704 to enter the nitrogen tank 600. And a fourth gas outlet valve 712 is arranged at the gas outlet of the nitrogen gas tank 600 and is used for discharging the gas in the nitrogen gas tank 600 to the required space.

In addition, flow meters may be provided between the valves to monitor the gas flow. In one embodiment, a flow meter 1000 is disposed between the third gas outlet valve 711 and the nitrogen gas tank 600. The low pressure air passes through first adsorption tower 100 or second adsorption tower 200, through the control to each valve, and then control nitrogen gas output flow, reduce the velocity of flow of air through the adsorption tower, it has certain pressure (0.2 ~ 0.8bar, as required pressure adjustment) through flowmeter 1000 to guarantee in first adsorption tower 100 or the second adsorption tower 200, and then get into nitrogen gas jar 600, the external nitrogen gas flow that supplies of rethread fourth air outlet valve 712 control, guarantee that nitrogen gas jar 600 has certain malleation.

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 requirements to improve the control accuracy of the air flow.

Above-mentioned novel pressure swing adsorption nitrogen generator 10 adopts vacuum pump 300 to control first adsorption tower 100 and second adsorption tower 200 internal pressure on the one hand, and supplementary adsorbent regeneration improves adsorbent adsorption efficiency, and reduces the adsorption pressure of system, and then reduces the equipment requirement, extension equipment life, reduction in production cost. On the other hand, the novel pressure swing adsorption nitrogen making device 10 is provided with a first flow limiting orifice plate 400,

because an adsorption tower is adsorbing, when another adsorption tower regenerates, there is certain pressure differential between two adsorption towers, can force the gas in the adsorption tower of adsorption to pass through first current-limiting orifice plate 400, utilize the current-limiting effect of first current-limiting orifice plate 400, during nitrogen gas gets into regenerated adsorption tower with certain velocity of flow, and then sweeps the adsorbent in the regeneration adsorption tower, make the adsorbent desorption oxygen as far as possible, can adsorb more oxygen in next adsorption cycle, improve the life of adsorbent.

In addition, first restriction orifice 400 simple structure, the cost is lower, and the aperture is more easily controlled, only needs to adjust the aperture when the debugging according to nitrogen gas production, adsorbent packing capacity, nitrogen gas purity etc. can realize accurate gas flow's control. Compared with valve control such as a needle valve and a stop valve, the device can greatly improve the precision of gas flow, avoid waste caused by overlarge gas flow, avoid the purpose that auxiliary adsorbent regeneration cannot be achieved due to undersize gas flow, further reduce the yield of next cycle nitrogen, and avoid the influence on the precision of the device caused by the deviation of the opening degree of the valve in the transportation process. The novel pressure swing adsorption nitrogen making device 10 can work under lower pressure (less than or equal to 0.5bar), can reduce the equipment requirement and reduce the manufacturing and maintenance cost.

The utility model discloses a method of embodiment's nitrogen generation, including following step:

s101: supplying gas, specifically: the gas supply 500 is turned on to provide compressed gas to the system.

In one embodiment, the air feeder is a high-pressure variable frequency fan, and the air pressure is 0.2-1 bar. The fan frequency can be adjusted as required to provide gas of different pressures and air volumes. Wherein the gas source can be air or a closed space such as a storage chamber.

The first adsorption tower 100 adsorbs and the second adsorption tower 200 regenerates, and the method specifically comprises 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 exhaust valve 706 and the third exhaust valve 709 are opened, and the fourth exhaust valve 710 is closed, so that the pressure in the second adsorption tower 200 is reduced to 0 bar.

(2) The third exhaust valve 709 is closed, and the fourth exhaust valve 710 is opened, so that the load of the vacuum pump 300 can be reduced and the service life of the vacuum pump 300 can be prolonged because the pressure in the second adsorption tower 200 is 0 bar. And starting the vacuum pump 300 to reduce the pressure in the second adsorption tower 100 to be less than or equal to-0.85 bar, and regenerating the second adsorption tower 100.

It is understood that the third exhaust valve 709 of step (1) may be omitted and the fourth exhaust valve 710 may be opened directly. Because the third exhaust valve 709 is provided, the pressure of the second adsorption tower 200 can be reduced to 0bar, the gas pressure entering the vacuum pump can be reduced, the burden 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: pressure equalization, specifically comprising the steps of:

the first equalizing valve 707 and the second equalizing valve 708 are opened to equalize the air pressures in the first adsorption tower 100 and the second adsorption tower 200.

It can be understood that the step S102 can be omitted to directly perform the adsorption of the second adsorption tower 200, the step of regenerating the first adsorption tower 100, and a part of gas can be recovered through the step of pressure equalization, thereby further reducing the production cost.

S103: supplying gas, specifically: and starting the gas supply machine to supply gas.

This step synchronizes step S101, which is not described herein again.

The second adsorption tower 200 adsorbs, and the first adsorption tower 100 regenerates, and specifically comprises the following steps:

(1) the second inlet valve 702 and the second outlet valve 704 are opened to allow the second adsorption tower 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 0 bar.

(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 burden of the vacuum pump 300 can be reduced and the service life of the vacuum pump 300 can be prolonged. And starting the vacuum pump 300 to reduce the pressure in the first adsorption tower 100 to be less than or equal to-0.85 bar, and regenerating the first adsorption tower 100.

It is understood that the third exhaust valve 709 of step (1) may be omitted and the fourth exhaust valve 710 may be opened directly. 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 burden 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 regeneration is complete, second inlet valve 702, second outlet valve 704, and first outlet valve 705 are closed.

S104: the first equalizing valve 707 and the second equalizing valve 708 are opened to equalize the air pressures in the first adsorption tower 100 and the second adsorption tower 200.

This step is the same as step S102, and is not described herein again.

S105: and sequentially and circularly performing the steps S101 to S104 for n times, wherein n is an integer greater than or equal to 0.

The nitrogen can be continuously prepared by repeating the circulation.

The valve opening/closing conditions at the respective steps in the above embodiment are shown in table 1.

Note: in table 1, OFF indicates OFF, and ON indicates ON.

As shown in fig. 2, the present invention provides a novel pressure swing adsorption nitrogen generation system, including the novel pressure swing adsorption nitrogen generation device 10 and the enclosed space 20, the air feeder 500 of the novel pressure swing adsorption nitrogen generation device 10 is communicated with the air outlet of the enclosed space 20, and the nitrogen tank 600 of the novel pressure swing adsorption nitrogen generation device 10 is communicated with the air inlet of the enclosed space 20.

The enclosed space 20 is a storage room or the like to which nitrogen gas needs to be supplied, for example, a fresh food shop or the like. Through communicating confined space 20 with novel pressure swing adsorption nitrogen plant 10, make the gas in the confined space 20 get into novel pressure swing adsorption nitrogen plant 10 through air feeder 500, the nitrogen gas that novel pressure swing adsorption nitrogen plant 10 produced passes through nitrogen gas jar 600 and gets into confined space 20, form a endless process, so relapse, not only guarantee the demand of confined space 20 to nitrogen gas, novel pressure swing adsorption nitrogen plant 10 is incessantly replaced the air in the confined space simultaneously, when device operating duration is more of a specified duration, nitrogen concentration in the confined space 20 is more and more high, the nitrogen purity of the compressed air that air feeder 500 provided is also more and more high, when making equal flow nitrogen gas, novel pressure swing adsorption nitrogen plant 10 produces nitrogen gas purity and just higher, it is higher promptly to produce the nitrogen flow.

The novel pressure swing adsorption nitrogen making device 10 has the same structure and connection mode as those described above, and is not described herein.

In an embodiment, the novel pressure swing adsorption nitrogen generating system further includes a third gas inlet valve 713 and a fourth gas inlet valve 714, wherein the third gas inlet valve 713 is disposed between the gas supplier 500 and the gas outlet of the enclosed space 20 and is used for controlling the gas in the enclosed space 20 to enter the gas supplier 500. The fourth air intake valve 714 is connected in parallel with the third air intake valve 713, and controls the external air to be introduced into the air feeder 500.

The pressure in the closed space 20 is ensured by the cooperation of the third intake valve 713 and the fourth intake valve 714. For example, the third air intake valve 713 and the fourth air intake valve 714 are interlocked, and when the third air intake valve 713 is opened, the fourth air intake valve 714 is closed; when the fourth air intake valve 714 is closed, the third air intake valve 713 is opened, so that the lowest pressure and the highest pressure in the enclosed space 20 are ensured by controlling the opening and closing times of the third air intake valve 713 and the fourth air intake valve 714, and the flow rate of nitrogen gas into the enclosed space 20 is equal to the flow rate to the air feeder 500 through the third air intake valve 713. Therefore, the pressure in the sealed space 20 can be preset to adjust the opening times of the third air intake valve 713 and the fourth air intake valve 714, thereby realizing automatic control.

The utility model discloses a novel nitrogen making method of pressure swing adsorption nitrogen making system of embodiment, including following step:

s201: supplying gas, specifically: according to the pressure condition in the enclosed space 20, the third air intake valve 713 or the fourth air intake valve 714 is selectively opened to allow the air in the enclosed space or the outside to pass through the air feeder 500, and the air with a certain pressure is supplied by the action of the air feeder 50.

S202: pressure equalization, specifically comprising the steps of:

It can be understood that the step S202 can be omitted and the adsorption of the second adsorption tower 200 can be directly carried out, the step of regenerating the first adsorption tower 100 can be omitted, and a part of gas can be recycled through the step of pressure equalization, so that the production cost can be further reduced.

S203: supplying gas, specifically:

according to the pressure condition in the enclosed space 20, the third air intake valve 713 or the fourth air intake valve 714 is selectively opened to allow the air in the enclosed space or the outside to pass through the air feeder 500, and the air with a certain pressure is supplied by the action of the air feeder 50.

This step synchronizes step S201, which is not described herein again.

S204: the first equalizing valve 707 and the second equalizing valve 708 are opened to equalize the air pressures in the first adsorption tower 100 and the second adsorption tower 200.

The step is the same as step S202, and is not described herein again.

S205: and sequentially and circularly performing the steps S201 to S204 for n times, wherein n is an integer greater than or equal to 0.

The nitrogen can be continuously prepared by repeating the circulation. When the time of novel pressure swing adsorption nitrogen generator 10 operation is more for a long time, nitrogen concentration in airtight space 20 is higher and higher, and the nitrogen purity of the compressed gas that the air feeder provided is also higher and higher, and when making equal flow nitrogen gas, novel pressure swing adsorption nitrogen generator produced nitrogen purity and just higher, produced the nitrogen flow more high promptly.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A novel pressure swing adsorption nitrogen making device is characterized by comprising: the device comprises a first adsorption tower, a second adsorption tower, a vacuum pump, a first flow limiting pore plate, an air supply machine, a nitrogen tank and a valve group; the valve group includes: the first air inlet valve, the second air inlet valve, the first air outlet valve, the second air outlet valve, the first exhaust valve and the second exhaust valve;

2. The novel pressure swing adsorption nitrogen plant of claim 1, wherein the first restriction orifice plate is removably connected between the first adsorption column and the second adsorption column.

3. The novel pressure swing adsorption nitrogen plant of claim 2, wherein the first restrictive orifice is configured to: and in the process of performing primary adsorption on the first adsorption tower or the second adsorption tower, the flow of the gas passing through the first limiting orifice plate accounts for 3-7% of the total amount of the prepared gas.

4. The novel pressure swing adsorption nitrogen generation device of any one of claims 1-3, wherein the valve set further comprises a first pressure equalizing valve and a second pressure equalizing valve; the gas inlet of the first adsorption tower is communicated with the gas inlet of the second adsorption tower through the first pressure equalizing valve; and the gas outlet of the first adsorption tower is communicated with the gas outlet of the second adsorption tower through the second pressure equalizing valve.

5. The novel pressure swing adsorption nitrogen making device as claimed in claim 4, wherein a second flow limiting orifice plate is arranged between the gas inlet of the first adsorption tower and the gas inlet of the second adsorption tower, and the second flow limiting orifice plate is connected with the first pressure equalizing valve in series.

6. The novel pressure swing adsorption nitrogen making device as claimed in claim 5, wherein a third flow limiting pore plate is arranged between the gas outlet of the first adsorption tower and the gas outlet of the second adsorption tower, and the third flow limiting pore plate is connected with the second pressure equalizing valve in series.

7. The novel pressure swing adsorption nitrogen plant of claim 6, wherein the valve block 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;

8. The novel pressure swing adsorption nitrogen making device as claimed in claim 7, wherein the air feeder is a high-pressure variable-frequency fan.

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, wherein the air supply machine 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 system of claim 9, further comprising a third gas inlet valve and a fourth gas inlet valve, wherein the third gas inlet valve is disposed between the gas supplier and the gas outlet of the enclosed space, and is used for controlling gas in the enclosed space to enter the gas supplier;