CN101862574B - Vacuum pressure swing adsorption system - Google Patents
Vacuum pressure swing adsorption system Download PDFInfo
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- CN101862574B CN101862574B CN201010211500A CN201010211500A CN101862574B CN 101862574 B CN101862574 B CN 101862574B CN 201010211500 A CN201010211500 A CN 201010211500A CN 201010211500 A CN201010211500 A CN 201010211500A CN 101862574 B CN101862574 B CN 101862574B
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Abstract
The invention provides a vacuum pressure swing adsorption system, which comprises six adsorbers, two groups of independent blowers and three groups of independent vacuum pumps, wherein each group of blowers are connected with the inlet ends of four adsorbers respectively, each group of vacuum pumps are connected with the inlet ends of two adsorbers respectively, the inlet end of each adsorber is communicated with the atmosphere, the outlet ends of the two adsorbers connected with the each group of vacuum pumps are connected, and the outlet end of each adsorber is connected with a product gas tank. The vacuum pressure swing adsorption system cyclically executes the following steps of: adsorption, forward pressure release, vacuum desorption and pressure charge, wherein the ratio of the execution time of the adsorption step to the execution time of the vacuum desorption step is less than 1. The system can enlarge oxygen production scale, reduce the air quantity of the blowers, prolong the vacuum desorption time and reduce the pumping speed of the vacuum pumps so as to reduce energy consumption of the system and save the cost.
Description
Technical field
The present invention relates to the technical field that pressure swing adsorption air separates, particularly relate to a kind of vacuum pressure swing adsorption system.
Background technology
Vacuum Pressure Swing Adsorption (being called for short VPSA) system; Promptly be higher than under the atmospheric condition; Utilize impurity such as the airborne nitrogen of the VPSA system dedicated molecular sieve used selective absorption of oxygen, carbon dioxide and water; Under the condition that vacuumizes, molecular sieve is carried out desorb, thereby circulation makes the higher oxygen of purity (90～95%).
The VPSA system mainly is made up of air blast, vavuum pump, transfer valve, absorber and oxygen surge tank.Raw air gets into air blast after the suction inlet filter is removed dust granule, under the conveying of air blast, get into wherein in the absorber.Filled with adsorbent in the absorber, wherein moisture, carbon dioxide, and the adsorbent (like activated alumina) that is loaded in the absorber porch in the bottom of a small amount of other gas component adsorbed.The top of absorber is zeolite molecular sieve; When air is flowed through the molecular sieve fixed bed that fills up; Airborne nitrogen molecule is diffused in the molecular sieve solid under adsorption; And oxygen (comprising argon gas) drains into oxygen surge tank from the absorber top exit as product gas as non-absorbed component, uses for producing.
Through after a while absorption, be full of nitrogen molecule in the sieve particle, the state that will reach capacity of adsorbent wherein, utilize vavuum pump that it vacuumized (with absorption in the opposite direction) through transfer valve this moment.Be specially; Close air inlet valve; Utilize the oxygen-enriched air in the absorber that another absorber that has just vacuumized is all pressed, close equalizing valve when equal pressure drops to a certain value, open the vavuum pump inlet valve simultaneously absorber is vacuumized; Utilize in oxygen rich air and the oxygen surge tank in another absorption partly that product gas cleans zeolite molecular sieve behind the certain vacuum degree again, thereby make the thorough desorb of adsorbent.After the adsorbent desorption process was accomplished, the moisture that has adsorbed, carbon dioxide, nitrogen and a small amount of other gas component were drawn out of and drain into atmosphere, and adsorbent obtains regeneration.With product gas absorber is carried out pressurising then, close respective valves after being pressurized to a certain force value, open the blower export valve, absorber is boosted.In brief, promptly each absorber of VPSA system is all alternately being carried out following steps: absorption---desorb---pressurising, above-mentioned three basic processing steps are realized automatic control by PLC and transfer valve system.
This existing VPSA system has following shortcoming:
1, owing to have only two absorbers, receive the restriction of adsorber structure size, its maximum system oxygen scale is less relatively, only at 5000-6000M
3About/h; And expand 10000M to if will make the oxygen scale
3More than/the h, overlap or overlap more two VPSA systems parallel connections with two and use, will make that cost improves greatly;
2, in existing two VPSA technologies, air blast is discontinuously to the absorber air feed, each cycle period, and the air blast exhaust is to atmosphere emptying twice, each duration 2-4 second.For guaranteeing that nitrogen oxygen separates required processing air capacity, the air blast capacity need increase 8%-20%.Before the air blast exhaust emptying, the air blast exhaust outlet advances in the pipeline space between the valve of absorber to control compressed air, is full of the compressed air of maximum pressure.Along with air blast exhaust emptying, pressure drops to atmospheric pressure, causes compressed-air actuated supplementary loss;
Be well known that 3, the consumption of vavuum pump energy is the major control factor that the VPSA system capacity consumes.Required vacuum pumping speed of vacuum desorption and circulation time do not have direct relation, and be closely related with adsorption time and the ratio of vacuum desorption time.Circulation time is certain, and adsorption time is short, and the vacuum desorption time is long, and both ratio is less than 1.The required vacuum pumping speed of vacuum desorption is little.Yet; Existing two and three VPSA technologies, adsorption time is equal to or greater than the vacuum desorption time, if shorten adsorption time; Prolong the vacuum desorption time; The air supply that unit interval is advanced absorber increases, and except that increasing the air blast capacity, compressed-air actuated void tower flow velocity increases in the absorber.Existing two or three VPSA technologies have only a vavuum pump that an absorber is vacuumized, and cycle period is certain, can not realize shortening adsorption time, prolong the vacuum desorption time, and required vacuum pumping speed is still bigger.
Therefore; Need the urgent technical problem that solves of those skilled in the art to be exactly at present: how can propose a kind of vacuum pressure swing adsorption system and technology controlling and process thereof mechanism with innovating,, reduce air blast tolerance in order to enlarge system oxygen scale; Prolong the vacuum desorption time; Reduce vacuum pumping speed, thereby reduce the energy consumption of system, practice thrift cost.
Summary of the invention
Technical problem to be solved by this invention provides a kind of Vacuum Pressure Swing Adsorption device, in order to enlarge system oxygen scale, reduces air blast tolerance, prolongs the vacuum desorption time, reduces vacuum pumping speed, thereby reduces the energy consumption of system, practices thrift cost.
In order to address the above problem, the invention discloses a kind of Vacuum Pressure Swing Adsorption device, comprise six absorbers, two groups of air blasts independently, and, three groups of vavuum pumps independently; Wherein, Each organizes the arrival end that air blast connects four absorbers respectively; Each organizes the arrival end that vavuum pump connects two absorbers respectively; The arrival end of each absorber and atmosphere are linked to each other by each port of export of organizing two absorbers of vavuum pump connection, and the port of export of each absorber is connected with the product gas tank;
Following steps are carried out in said Vacuum Pressure Swing Adsorption device circulation:
Adsorption step: each is organized air blast and carries compressed air to an absorber of its connection, carry out adsorption treatment by this absorber after, output products gas to product gas tank;
Forward put the pressure step: when current absorber reaches or be stabilized in predetermined maximum pressure, forward put pressure to another absorber that links to each other with its port of export by current absorber;
The vacuum desorption step: the vavuum pump by connecting current absorber vacuumizes current absorber;
Pressurising step: utilize forward the putting of another absorber that links to each other with the current absorber port of export to calm the anger; And the product gas in the product gas tank carries out reverse pressurising to current absorber; And when the pressure of current absorber is lower than atmospheric pressure, from atmosphere, suck raw air;
The ratio of the time of implementation of the time of implementation of said adsorption step and vacuum desorption step is less than 1; The time of implementation of said adsorption step is meant; Absorber begins inspiration compressed air and reaches or be stabilized in time of predetermined maximum pressure to absorber, and the time of implementation of said vacuum desorption step is meant that absorber begins to be evacuated down to clean and finishes required time;
Wherein, Said air blast comprises air blast 1 (AC-1) and air blast 2 (AC-2); Said vavuum pump comprises vavuum pump 1 (VP-1), vavuum pump 2 (VP-2) and vavuum pump 3 (VP-3); Said air blast 1 (AC-1) is through air header 1 (10) and air arm 1 (10A), air arm 2 (10B), air arm 3 (10C), air arm 4 (10D), and the arrival end with absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D) is connected respectively;
Air blast 2 (AC-2) is through air header 2 (11) and air arm 5 (11C), air arm 6 (11D), air arm 7 (11E), air arm 8 (11F), and the arrival end with absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) is connected respectively;
Vavuum pump 1 (VP-1) is through vacuum house steward 1 (20) and vacuum manifold 1 (20A), vacuum manifold 2 (20B), and the arrival end with absorber 1 (A), absorber 2 (B) is connected respectively;
Vavuum pump 2 (VP-2) is through vacuum house steward 2 (21) and vacuum manifold 3 (21C), vacuum manifold 4 (21D), and the arrival end with absorber 3 (C), absorber 4 (D) is connected respectively;
Vavuum pump 3 (VP-3) is through vacuum house steward 3 (22) and vacuum manifold 5 (22E), vacuum manifold 6 (22F), and the arrival end with absorber 5 (E), absorber 6 (F) is connected respectively;
The arrival end of said absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) is through air header 3 (12) and air arm 9 (12A), air arm 10 (12B), air arm 11 (12C), air arm 12 (12D), air arm 13 (12E), air arm 14 (12F) and atmosphere;
The port of export of said absorber 1 (A) and absorber 2 (B), absorber 3 (C) and absorber 4 (D), absorber 5 (E) and absorber 6 (F) is connected by pipeline 1 (40AB), pipeline 2 (40CD), pipeline 3 (40EF) respectively;
The port of export of said absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) also is connected with oxygen house steward's (42) a end through oxygen manifold 1 (41A), oxygen manifold 2 (41B), oxygen manifold 3 (41C), oxygen manifold 4 (41D), oxygen manifold 5 (41E), oxygen manifold 6 (41F);
The port of export of said absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) also is connected with oxygen house steward's (42) a end through oxygen manifold 7 (42A), oxygen manifold 8 (42B), oxygen manifold 9 (42C), oxygen manifold 10 (42D), oxygen manifold 11 (42E), oxygen manifold 12 (42F);
Said oxygen house steward's (42) the other end is connected with product gas tank (VS-1).
Preferably, said forward putting presses step to carry out at twice:
Forward putting for the first time pressure is when current absorber reaches or be stabilized in predetermined maximum pressure, forward to put pressure by current absorber to another absorber that links to each other with its port of export;
Forward putting for the second time pressure does, is continued forward to put pressure to another absorber that links to each other with its port of export by current absorber, opens the vavuum pump that connects current absorber simultaneously current absorber is vacuumized.
Preferably, said pressurising step is divided and is carried out for four times:
Pressurising for the first time does, forward putting that another absorber that links to each other with the current absorber port of export from the port of export input of current absorber flows out for the first time calmed the anger, and the while arrival end of current absorber vacuumizes;
Pressurising for the second time does, forward putting that another absorber that links to each other with the current absorber port of export from the port of export input of current absorber flows out for the second time calmed the anger, and the while arrival end of current absorber sucks raw air from atmosphere;
Pressurising for the third time does, the product gas from the port of export input product gas tank of current absorber, and the arrival end of current absorber continues to suck raw air from atmosphere simultaneously;
The 4th pressurising do, the product gas from the port of export input product gas tank of current absorber, and the arrival end of current absorber receives the compressed air that connected air blast is carried simultaneously.
Preferably; The said absorber that is connected with two groups of air blasts is when the 4th pressurising step of execution and adsorption step; Select the idle air blast of current slot to carry compressed air to current absorber; And need, other absorber switch to other air blast and carry compressed air when carry compressed air to current absorber at current air blast.
Preferably, also be used in the said vacuum desorption step carrying out:
Clean substep: the vavuum pump by connecting current absorber vacuumizes current absorber, and the product gas in the product gas tank flows into the port of export of current absorber simultaneously, and current absorber is carried out reverse cleaning.
Preferably; The inner filling of said absorber LiX molecular sieve and the adsorbent that is used to remove water in air branch, carbon dioxide and other impurity composition; When carrying out adsorption step, airborne moisture, carbon dioxide, other impurity composition and nitrogen are adsorbed by said LiX molecular sieve and adsorbent, and airborne oxygen is by enrichment; Go out absorber as the product air-flow, flow into the product gas tank.
Preferably, the said airflow direction of forward putting pressure is identical with compressed-air actuated airflow direction, and through forward putting for the first time pressure, the bed layer pressure of current absorber reduces 10kPa-30kPa.
Preferably, after said vacuum desorption step was complete, the bed layer pressure of current absorber was reduced to predetermined minimum pressure.
Preferably, the raw air amount that said absorber sucks from atmosphere is greater than 15%～30% of device technique air capacity, and said plant air amount is separated required processing air capacity sum for absorber clearance space loss air capacity with oxygen nitrogen.
Compared with prior art, the present invention has the following advantages:
1, the present invention only need be provided with two groups of air blasts, continuously to six absorber air feed, does not exist the air blast exhaust to be interrupted emptying and additional compressed air loss by two groups of air blasts; When absorber pressure is lower than atmospheric pressure, directly from atmosphere, suck the part material air, use the situation of (3 cover) with respect to the parallel connection of existing two VPSA systems; The air blast of setting required for the present invention still less; And the capacity of air blast of the present invention is less than two and three VPSA technologies, and is littler by 20%～30% than two and three VPSA technologies usually; Not only reasonably shortened adsorption time, can not cause that also compressed air void tower flow velocity ground increases in the absorber.
2, reducing the air blast capacity, do not increasing in the absorber and reasonably shorten adsorption time under the compressed-air actuated void tower flow rate conditions owing to the present invention; And being provided with three groups of vavuum pumps vacuumizes three absorbers respectively simultaneously; Thereby prolonged the absorber vacuum desorption time; Make adsorption time less than the vacuum desorption time, adsorption time promptly of the present invention and the ratio of vacuum desorption time are less than 1.Because vacuum desorption time ground prolongs the corresponding minimizing of then required vacuum pumping speed.
3, six VPSA process cycles of the present invention are shorter cycle time, in reality, are generally equal to or less than two VPSA technologies.Selecting with a kind of LiX molecular sieve; Under the identical condition of scale; The consumption of LiX molecular sieve is equal to or slightly less than two VPSA technologies, and the physical dimension of absorber is much littler than two VPSA technologies, but six VPSA technologies of the present invention make system oxygen scale enlarge 10000M
3More than/the h.
4, use the embodiment of the invention, at a time, have two groups independently air blast respectively two absorbers are carried compressed air continuously, the absorber bed also can directly suck raw air from atmosphere, to reduce air blast tolerance; There are three groups of vavuum pumps respectively three absorber beds to be vacuumized,, prolong the bed pumpdown time through the intersection of three groups of vavuum pumps to the absorber bed pumpdown time; To reduce vacuum pumping speed; Thereby enlarged the scale of device system oxygen, reduced the energy consumption of system, and practiced thrift cost.
Description of drawings
Fig. 1 is the structure chart of a kind of vacuum pressure swing adsorption system of the present invention;
Fig. 2 is a cyclic process sketch map of carrying out Vacuum Pressure Swing Adsorption of the present invention to absorber A;
Fig. 3 is a process chart of carrying out the cyclic process of Vacuum Pressure Swing Adsorption of the present invention to six absorber A, B, C, D, E, F.
The specific embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and the specific embodiment the present invention done further detailed explanation.
One of core idea of the embodiment of the invention is, proposes a kind of in the consumption of reduction system capacity, on the basis of saving cost; Enlarge the six-tower vacuum pressure swing adsorption system of system oxygen scale, native system has adopted six absorbers enlarging system oxygen scale, and adopt two groups independently air blast carry compressed air to absorber continuously; When the pressure of absorber is lower than atmospheric pressure; Absorber also can suck raw air from atmosphere, thereby can reduce the capacity of air blast, reasonably shortens adsorption time; Native system also adopts three groups of vavuum pumps respectively three absorbers to be vacuumized; Through the intersection of three groups of vavuum pumps to the absorber bed pumpdown time; Prolong the bed pumpdown time; Make time that native system adsorbs less than time of vacuum desorption, promptly adsorption time and the ratio of vacuum desorption time is less than 1, thereby reduced the pumping speed of vavuum pump.
Particularly, six-tower vacuum pressure swing adsorption system of the present invention comprises six absorbers, two groups of air blasts independently, and, three groups of vavuum pumps independently; Wherein, Each organizes the arrival end that air blast connects four absorbers respectively; Each organizes the arrival end that vavuum pump connects two absorbers respectively; The arrival end of each absorber and atmosphere are linked to each other by each port of export of organizing two absorbers of vavuum pump connection, and the port of export of each absorber is connected with the product gas tank.
For making those skilled in the art understand the present invention better, specify the structure of a kind of vacuum pressure swing adsorption system of the present invention below in conjunction with Fig. 1, said six absorbers are respectively absorber A, B, C, D, E, F; Said two groups independently air blast be respectively AC-1, AC-2; Said three groups independently vavuum pump be respectively VP-1, VP-2, VP-3;
Said air blast AC-1 is through air header 10 and air arm 10A, 10B, 10C, 10D; Arrival end with absorber A, B, C, D is connected respectively, said air arm 10A, 10B, 10C, last transfer valve 30A, 30B, 30C, the 30D that is separately installed with control compressed air entering absorber of 10D;
Air blast AC-2 is through air header 11 and air arm 11C, 11D, 11E, 11F; Arrival end with absorber C, D, E, F is connected respectively, said air arm 11C, 11D, 11E, last transfer valve 31C, 31D, 31E, the 31F that is separately installed with control compressed air entering absorber of 11F;
Vavuum pump VP-1 is through vacuum house steward 20 and vacuum manifold 20A, 20B, and the arrival end with absorber A, B is connected respectively, and said vacuum manifold 20A, last being separately installed with of 20B are controlled transfer valve 32A, the 32B that absorber vacuumizes;
Vavuum pump VP-2 is through vacuum house steward 21 and vacuum manifold 21C, 21D, and the arrival end with absorber C, D is connected respectively, and said vacuum manifold 21C, last being separately installed with of 21D are controlled transfer valve 32C, the 32D that absorber vacuumizes;
Vavuum pump VP-3 is through vacuum house steward 22 and vacuum manifold 22E, 22F, and the arrival end with absorber E, F is connected respectively, and said vacuum manifold 22E, last being separately installed with of 22F are controlled transfer valve 32E, the 32F that absorber vacuumizes;
The arrival end of said absorber A, B, C, D, E, F is through air header 12 and air arm 12A, 12B, 12C, 12D, 12E, 12F and atmosphere, and said air arm 12A, 12B, 12C, 12D, 12E, the last control absorber that is separately installed with of 12F are from atmosphere air-breathing transfer valve 33A, 33B, 33C, 33D, 33E, 33F;
The port of export of said absorber A and B, C and D, E and F is connected by pipeline 40AB, 40CD, 40EF respectively, and said pipeline 40AB, 40CD, 40EF be last to be separately installed with control and forward to put and calm the anger and control valve 34AB, 34CD, the 34EF of reverse pressurising gas;
The port of export of said absorber A, B, C, D, E, F also is connected with an end of oxygen house steward 42 through oxygen manifold 41A, 41B, 41C, 41D, 41E, 41F, said oxygen manifold 41A, 41B, 41C, 41D, 41E, last control valve 35A, 35B, 35C, 35D, 35E, the 35F that is separately installed with the reverse pressurising of control absorber of 41F;
The port of export of said absorber A, B, C, D, E, F also is connected with an end of oxygen house steward 42 through oxygen manifold 42A, 42B, 42C, 42D, 42E, 42F, and said oxygen manifold 42A, 42B, 42C, 42D, 42E, 42F be last to be separately installed with check-valves or transfer valve 36A, 36B, 36C, 36D, 36E, 36F;
Said oxygen house steward's 42 the other end is connected with product gas tank VS-1.
As a kind of preferred embodiment of the present invention, in concrete the application, the control valve 39 of all right installation and control oxygen flow on the said oxygen house steward 42; Can also distinguish the transfer valve 50 and 51 of installation and control air blast exhaust emptying on the said air header 10 and 11; Can also distinguish the installation and control vavuum pump on the said vacuum house steward 20,21,22 from the air-breathing transfer valve 52,53,54 of atmosphere.
For the embodiment of the invention, in concrete the realization, each is organized air blast and has a complete blower unit at least; Each is organized vavuum pump and has a complete mechanical type vacuum unit at least; The inside of said absorber A, B, C, D, E, F is loaded the LiX molecular sieve and is used to remove the adsorbent of water in air branch, carbon dioxide and other impurity composition, like NaX molecular sieve, activated alumina etc.
Following steps are carried out in vacuum pressure swing adsorption system circulation of the present invention:
Adsorption step: each is organized air blast and carries compressed air to an absorber of its connection, carry out adsorption treatment by this absorber after, output products gas to product gas tank;
Forward put the pressure step: when current absorber reaches or be stabilized in predetermined maximum pressure, forward put pressure to another absorber that links to each other with its port of export by current absorber;
The vacuum desorption step: the vavuum pump by connecting current absorber vacuumizes current absorber;
Pressurising step: utilize forward the putting of another absorber that links to each other with the current absorber port of export to calm the anger; And the product gas in the product gas tank carries out reverse pressurising to current absorber; And when the pressure of current absorber is lower than atmospheric pressure, from atmosphere, suck raw air;
In embodiments of the present invention, the ratio of the time of implementation of the time of implementation of said adsorption step and vacuum desorption step is less than 1.
Particularly; Behind the compressed air entering absorber bed that air blast is carried, airborne moisture content, carbon dioxide and other impurity compositions are adsorbed agent (like NaX molecular sieve or activated alumina etc.) absorption, when the compressed air of purification passes through LiX molecular sieve bed; Nitrogen is selected absorption in the air; Oxygen components is gone out absorber by enrichment as the product air-flow in the air, flows into the product gas tank.
After above-mentioned adsorption step finishes; Current absorber bed will reach or be stabilized in predetermined maximum pressure; Need press the bed layer pressure that reduces current absorber this moment through forward putting; The said airflow direction of forward putting pressure is identical with compressed-air actuated airflow direction, and in a kind of preferred embodiment of the present invention, said forward putting presses step to carry out at twice:
Forward putting for the first time pressure is when current absorber reaches or be stabilized in predetermined maximum pressure, forward to put pressure by current absorber to another absorber that links to each other with its port of export;
In concrete the realization, through forward putting pressure for the first time, the bed layer pressure of current absorber can reduce 10kPa-30kPa usually.
Forward putting for the second time pressure does, is continued forward to put pressure to another absorber that links to each other with its port of export by current absorber, opens the vavuum pump that connects current absorber simultaneously current absorber is vacuumized.
Above-mentioned forward put press step to finish after, carry out the vacuum desorption step, utilize the vavuum pump that connects current absorber that current absorber is vacuumized; In a kind of preferred embodiment of the present invention; When the bed layer pressure of current absorber reaches predetermined low pressure, can also further carry out and clean substep, promptly when current absorber is vacuumized; Product gas in the product gas tank flows into the port of export of current absorber; Current absorber is carried out reverse cleaning, and after cleaning finishes, the bed layer pressure of current absorber will be reduced to predetermined minimum pressure.
In this case; The ratio of the time of implementation of the time of implementation of said adsorption step and vacuum desorption step is meant less than 1; Absorber begins inspiration compressed air and reaches or be stabilized in time of predetermined maximum pressure to absorber, with absorber begin to be evacuated down to clean finish required time ratio less than 1.
After above-mentioned vacuum desorption step finishes, need carry out pressurising to current absorber, to improve bed layer pressure.In a kind of preferred embodiment of the present invention, said pressurising step can be divided and carried out for four times:
Pressurising for the first time does, forward putting that another absorber that links to each other with the current absorber port of export from the port of export input of current absorber flows out for the first time calmed the anger, and the while arrival end of current absorber vacuumizes;
Pressurising for the second time does, forward putting that another absorber that links to each other with the current absorber port of export from the port of export input of current absorber flows out for the second time calmed the anger, and the while arrival end of current absorber sucks raw air from atmosphere;
Pressurising for the third time does, the product gas from the port of export input product gas tank of current absorber, and the arrival end of current absorber continues to suck raw air from atmosphere simultaneously;
The 4th pressurising do, the product gas from the port of export input product gas tank of current absorber, and the arrival end of current absorber receives the compressed air that connected air blast is carried simultaneously.
Adsorption time of the present invention is relevant with cyclic program, and circulation time confirms that adsorption time is definite basically.Absorber is few from atmosphere suction raw air amount; The air supply that unit interval is advanced absorber increases; Compressed-air actuated void tower flow velocity might be higher than permissible value in the absorber; Thereby in reality, the raw air amount that said absorber sucks from atmosphere is greater than 15%～30% of device technique air capacity, and said plant air amount is separated required processing air capacity sum for absorber clearance space loss air capacity with oxygen nitrogen.
Use the embodiment of the invention, at a time, have two groups independently air blast respectively two absorbers are carried compressed air continuously, the absorber bed also can directly suck raw air from atmosphere, to reduce air blast tolerance; There are three groups of vavuum pumps respectively three absorber beds to be vacuumized; Through the intersection of three groups of vavuum pumps to the absorber bed pumpdown time; Prolong the bed pumpdown time; Reducing vacuum pumping speed, thereby the scale of the expansion instrument system of reaching oxygen reduces the energy consumption of system and the purpose of practicing thrift cost.
Need to prove; The said absorber (absorber C and D as shown in Figure 1) that is connected with two groups of air blasts is when the 4th pressurising step of execution and adsorption step; Can select the idle air blast of current slot to carry compressed air to current absorber; And need, other absorber switch to other air blast and carry compressed air when carry compressed air to current absorber at current air blast.
For making those skilled in the art understand the present invention better,, further specify the embodiment of the invention below in conjunction with vacuum pressure swing adsorption system shown in Figure 1 and the cyclic process sketch map to absorber A execution Vacuum Pressure Swing Adsorption of the present invention shown in Figure 2.
First step (vacuum desorption step, vacuum):
Vavuum pump VP-1 vacuumizes absorber A, and the transfer valve 32A that the control absorber vacuumizes opens;
Second step (the vacuum desorption step is cleaned):
Vavuum pump VP-1 continues absorber A is vacuumized, and the control valve 35A that controls the absorber cleaning simultaneously opens, and the oxygen among the oxygen house steward 42 flows into absorber A, and absorber A is carried out reverse cleaning;
In reality, this step can be omitted.
Third step (step of pressurising for the first time, pressurising 1):
Vavuum pump VP-1 continues absorber A is vacuumized, and control is simultaneously forward exitted and the control valve 34AB of reverse inflation leaves, and forward put the first time of utilizing absorber B to flow out calms the anger, and absorber A is carried out reverse pressurising;
The 4th step (step of pressurising for the second time, pressurising 2):
Forward put the second time of utilizing absorber B to flow out calms the anger, and continues absorber A is carried out reverse pressurising; Control absorber simultaneously and open from the air-breathing transfer valve 33A of atmosphere, absorber A sucks raw air from atmosphere;
The 5th step (pressurising step for the third time, pressurising 3):
Absorber A continues to suck raw air from atmosphere; Control valve 35A leaves simultaneously, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber A;
The 6th step (the 4th pressurising step, pressurising 4)):
Oxygen among the oxygen house steward continues the reverse pressurising of absorber A, and simultaneously, the transfer valve 30A that control compressed air advances absorber opens, and air blast AC-1 carries compressed air, and absorber A is carried out pressurising;
The 7th step (adsorption step):
Air blast AC-1 continues absorber A is carried compressed air, and after the pressure of absorber A was higher than oxygen house steward's pressure, valve 36A opened, and product flows into the product gas tank through the oxygen house steward.
The 8th step (forward putting the pressure step for the first time) along putting 1:
After absorber A reached or is stabilized in predetermined maximum pressure, valve 34AB opened, and absorber A carries out forward putting the first time pressure to absorber B;
The 9th step (forward putting the pressure step for the second time) along putting 2:
Absorber A continues to carry out forward putting the second time pressure to absorber B, and simultaneously, valve 32A opens, and vavuum pump VP-1 vacuumizes absorber A.
The process chart of the cyclic process that is directed against six absorber A, B, C, D, E, F execution Vacuum Pressure Swing Adsorption of the present invention that further reference is shown in Figure 3; The cycle period of supposing a Vacuum Pressure Swing Adsorption process of execution is 48 seconds; Form by 18 time periods; Wherein, the 1st, 2,4,5,7,8,10,11,13,14,16,17 time period is set to 2 seconds; 3rd, 6,9,12,15,18 time periods are set to 4 seconds.
Suppose the time period of zero-time section for carrying out the Vacuum Pressure Swing Adsorption first step to absorber A, promptly the first step of absorber A takies the 1st, 2 time period (2+2 second); Second step takies the 3rd time period (4 seconds); Third step takies the 4th time period (2 seconds); The 4th step takies the 5th time period (2 seconds); The 5th step takies the 6th time period (4 seconds); The 6th step takies the 7th, 8 time period (2+2 second); The 7th step takies 9-12 the time period (4+2+2+4 second); The 8th step takies the 13rd time period (2 seconds); The 9th step takies the 14th time period (2 seconds); Taking 15-18 the time period (4+2+2+4 second) then vacuumizes absorber A.
Begin from the zero-time section, the cyclic process of carrying out Vacuum Pressure Swing Adsorption of the present invention to absorber B is:
First step (adsorption step takies 1-3 time period, 2+2+4 second):
Air blast AC-1 carries compressed air to absorber B, and after the pressure of absorber B was higher than oxygen house steward's pressure, valve 36B opened, and product flows into the product gas tank through the oxygen house steward;
Second step (, taking the 4th time period, 2 seconds) along putting 1:
After absorber B reached or is stabilized in predetermined maximum pressure, valve 34AB opened, and absorber B carries out forward putting the first time pressure to absorber A;
Third step (, taking the 5th time period, 2 seconds) along putting 2:
Absorber B continues to carry out forward putting the second time pressure to absorber A, and simultaneously, valve 32B opens, and vavuum pump VP-1 vacuumizes absorber B.
The 4th step (vacuumize, take 6-11 time period, 4+2+2+4+2+2 second):
Vavuum pump VP-1 continues absorber B is vacuumized;
The 5th step (clean, take the 12nd time period, 4 seconds):
Vavuum pump VP-1 continues absorber B is vacuumized, and the control valve 35B that controls the absorber cleaning simultaneously opens, and the oxygen among the oxygen house steward 42 flows into absorber B, and absorber B is carried out reverse cleaning;
The 6th step (pressurising 1 takies the 13rd time period, 2 seconds):
Vavuum pump VP-1 continues absorber B is vacuumized, and control is simultaneously forward exitted and the control valve 34AB of reverse inflation leaves, and forward put the first time of utilizing absorber A to flow out calms the anger, and absorber B is carried out reverse pressurising;
The 7th step (pressurising 2 takies the 14th time period, 2 seconds):
Forward put the second time of utilizing absorber A to flow out calms the anger, and continues absorber B is carried out reverse pressurising; Control absorber simultaneously and open from the air-breathing transfer valve 33B of atmosphere, absorber B sucks raw air from atmosphere;
The 8th step (pressurising 3 takies the 15th time period, 4 seconds):
Absorber B continues to suck raw air from atmosphere; Control valve 35B leaves simultaneously, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber B;
The 9th step (pressurising 4 takies the 16th, 17 time period, 2+2 second):
Oxygen among the oxygen house steward continues absorber B is carried out reverse pressurising, and simultaneously, the transfer valve 30B that control compressed air advances absorber opens, and air blast AC-1 carries compressed air, and absorber B is carried out pressurising;
Take the 18th time period (4 seconds) then to absorber B conveying compressed air.
Begin from the zero-time section, the cyclic process of carrying out Vacuum Pressure Swing Adsorption of the present invention to absorber C is:
First step (pressurising 4 takies the 1st, 2 time period, 2+2 second):
Valve 35C opens, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber C, and simultaneously, the transfer valve 31C that control compressed air advances absorber opens, and air blast AC-2 carries compressed air, and absorber C is carried out pressurising;
Second step (absorption takies 3-6 time period, 4+2+2+4 second):
The 3rd time period, continue to carry compressed air to absorber C by air blast AC-2; 4-6 time period, transfer valve 31C closes, and 30C opens, and switches to air blast AC-1 and carries compressed air to absorber C, and after the pressure of absorber C was higher than oxygen house steward's pressure, valve 36C opened, and product flows into the product gas tank through the oxygen house steward;
Third step (, taking the 7th time period, 2 seconds) along putting 1:
After absorber C reached or is stabilized in predetermined maximum pressure, valve 34CD opened, and absorber C carries out forward putting the first time pressure to absorber D;
The 4th step (, taking the 8th time period, 2 seconds) along putting 2:
Absorber C continues to carry out forward putting the second time pressure to absorber D, and simultaneously, valve 32C opens, and vavuum pump VP-2 vacuumizes absorber C.
The 5th step (vacuum takies 9-14 time period, 4+2+2+4+2+2 second):
Vavuum pump VP-2 continues absorber C is vacuumized;
The 6th step (clean, take the 15th time period, 4 seconds):
Vavuum pump VP-2 continues absorber C is vacuumized, and the control valve 35C that controls the absorber cleaning simultaneously opens, and the oxygen among the oxygen house steward 42 flows into absorber C, and absorber C is carried out reverse cleaning;
The 7th step (pressurising 1 takies the 16th time period, 2 seconds):
Vavuum pump VP-2 continues absorber C is vacuumized, and control is simultaneously forward exitted and the control valve 34CD of reverse inflation leaves, and forward put the first time of utilizing absorber D to flow out calms the anger, and absorber C is carried out reverse pressurising;
The 8th step (pressurising 2 takies the 17th time period, 2 seconds):
Forward put the second time of utilizing absorber D to flow out calms the anger, and continues absorber C is carried out reverse pressurising; Control absorber simultaneously and open from the air-breathing transfer valve 33C of atmosphere, absorber C sucks raw air from atmosphere;
The 9th step (pressurising 3 takies the 18th time period, 4 seconds):
Absorber C continues to suck raw air from atmosphere; Control valve 35C leaves simultaneously, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber C.
Begin from the zero-time section, the cyclic process of carrying out Vacuum Pressure Swing Adsorption of the present invention to absorber D is:
First step (vacuum takies 1-5 time period, 2+2+4+2+2 second):
Valve 32D opens, and vavuum pump VP-2 vacuumizes absorber D;
Second step (clean, take the 6th time period, 4 seconds):
Vavuum pump VP-2 continues absorber D is vacuumized, and the control valve 35D that controls the absorber cleaning simultaneously opens, and the oxygen among the oxygen house steward 42 flows into absorber D, and absorber D is carried out reverse cleaning;
Third step (pressurising 1 takies the 7th time period, 2 seconds):
Vavuum pump VP-2 continues absorber D is vacuumized, and control is simultaneously forward exitted and the control valve 34CD of reverse inflation leaves, and forward put the first time of utilizing absorber C to flow out calms the anger, and absorber D is carried out reverse pressurising;
The 4th step (pressurising 2 takies the 8th time period, 2 seconds):
Forward put the second time of utilizing absorber C to flow out calms the anger, and continues absorber D is carried out reverse pressurising; Control absorber simultaneously and open from the air-breathing transfer valve 33D of atmosphere, absorber D sucks raw air from atmosphere;
The 5th step (pressurising 3 takies the 9th time period, 4 seconds):
Absorber D continues to suck raw air from atmosphere; Control valve 35D leaves simultaneously, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber D;
The 6th step (pressurising 4 takies the 10th, 11 time period, 2+2 second):
Oxygen among the oxygen house steward continues absorber D is carried out reverse pressurising, and simultaneously, the transfer valve 31D that control compressed air advances absorber opens, and air blast AC-2 carries compressed air, and absorber D is carried out pressurising;
The 7th step (absorption takies 12-15 time period, 4+2+2+4 second):
The 12nd time period, continue to carry compressed air to absorber D by air blast AC-2; 13-15 time period, transfer valve 31D closes, and 30D opens, and switches to air blast AC-1 and carries compressed air to absorber D, and after the pressure of absorber D was higher than oxygen house steward's pressure, valve 36D opened, and product flows into the product gas tank through the oxygen house steward;
The 8th step (, taking the 16th time period, 2 seconds) along putting 1:
After absorber D reached or is stabilized in predetermined maximum pressure, valve 34CD opened, and absorber D carries out forward putting the first time pressure to absorber C;
The 9th step (, taking the 17th time period, 2 seconds) along putting 2:
Absorber D continues to carry out forward putting the second time pressure to absorber C, and simultaneously, valve 32D opens, and vavuum pump VP-2 vacuumizes absorber D;
Taking the 18th time period (4 seconds) then continues to vacuumize to absorber D.
Begin from the zero-time section, the cyclic process of carrying out Vacuum Pressure Swing Adsorption of the present invention to absorber E is:
First step (, taking the 1st time period, 2 seconds) along putting 1:
After absorber E reached or is stabilized in predetermined maximum pressure, valve 34EF opened, and absorber E carries out forward putting the first time pressure to absorber F;
Second step (, taking the 2nd time period, 2 seconds) along putting 2:
Absorber E continues to carry out forward putting the second time pressure to absorber F, and simultaneously, valve 32E opens, and vavuum pump VP-3 vacuumizes absorber E;
Third step (vacuum takies 3-8 time period, 4+2+2+4+2+2 second):
Vavuum pump VP-3 continues absorber E is vacuumized;
The 4th step (clean, take the 9th time period, 4 seconds):
Vavuum pump VP-3 continues absorber E is vacuumized, and the control valve 35E that controls the absorber cleaning simultaneously opens, and the oxygen among the oxygen house steward 42 flows into absorber E, and absorber E is carried out reverse cleaning;
The 5th step (pressurising 1 takies the 10th time period, 2 seconds):
Vavuum pump VP-3 continues absorber E is vacuumized, and control is simultaneously forward exitted and the control valve 34EF of reverse inflation leaves, and forward put the first time of utilizing absorber F to flow out calms the anger, and absorber E is carried out reverse pressurising;
The 6th step (pressurising 2 takies the 11st time period, 2 seconds):
Forward put the second time of utilizing absorber F to flow out calms the anger, and continues absorber E is carried out reverse pressurising; Control absorber simultaneously and open from the air-breathing transfer valve 33E of atmosphere, absorber E sucks raw air from atmosphere;
The 7th step (pressurising 3 takies the 12nd time period, 4 seconds):
Absorber E continues to suck raw air from atmosphere; Control valve 35E leaves simultaneously, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber E;
The 8th step (pressurising 4 takies 13-14 time period, 2+2 second):
Oxygen among the oxygen house steward continues absorber E is carried out reverse pressurising, and simultaneously, the transfer valve 31E that control compressed air advances absorber opens, and air blast AC-2 carries compressed air, and absorber E is carried out pressurising;
The 9th step (absorption takies 15-18 time period, 4+2+2+4 second):
Air blast AC-2 continues to carry compressed air to absorber E, and after the pressure of absorber E was higher than oxygen house steward's pressure, valve 36E opened, and product flows into the product gas tank through the oxygen house steward.
Begin from the zero-time section, the cyclic process of carrying out Vacuum Pressure Swing Adsorption of the present invention to absorber F is:
First step (pressurising 1 takies the 1st time period, 2 seconds):
Valve 32F opens, and vavuum pump VP-3 vacuumizes absorber F, and control is simultaneously forward exitted and the control valve 34EF of reverse inflation leaves, and forward put the first time of utilizing absorber E to flow out calms the anger, and absorber F is carried out reverse pressurising;
Second step (pressurising 2 takies the 2nd time period, 2 seconds):
Forward put the second time of utilizing absorber E to flow out calms the anger, and continues absorber F is carried out reverse pressurising; Control absorber simultaneously and open from the air-breathing transfer valve 33F of atmosphere, absorber F sucks raw air from atmosphere;
Third step (pressurising 3 takies the 3rd time period, 4 seconds):
Absorber F continues to suck raw air from atmosphere; Control valve 35F leaves simultaneously, and the oxygen among the oxygen house steward carries out reverse pressurising to absorber F;
The 4th step (pressurising 4 takies the 4th, 5 time period, 2+2 second):
Oxygen among the oxygen house steward continues absorber F is carried out reverse pressurising, and simultaneously, the transfer valve 31F that control compressed air advances absorber opens, and air blast AC-2 carries compressed air, and absorber F is carried out pressurising;
The 5th step (absorption takies 6-9 time period, 4+2+2+4 second):
Air blast AC-2 continues to carry compressed air to absorber F, and after the pressure of absorber F was higher than oxygen house steward's pressure, valve 36F opened, and product flows into the product gas tank through the oxygen house steward;
The 6th step (, taking the 10th time period, 2 seconds) along putting 1:
After absorber F reached or is stabilized in predetermined maximum pressure, valve 34EF opened, and absorber F carries out forward putting the first time pressure to absorber E;
The 7th step (, taking the 11st time period, 2 seconds) along putting 2:
Absorber F continues to carry out forward putting the second time pressure to absorber E, and simultaneously, valve 32F opens, and vavuum pump VP-3 vacuumizes absorber F;
The 8th step (vacuum takies 12-17 time period, 4+2+2+4+2+2 second):
Vavuum pump VP-3 continues absorber F is vacuumized;
The 9th step (clean, take the 18th time period, 4 seconds):
Vavuum pump VP-3 continues absorber F is vacuumized, and the control valve 35F that controls the absorber cleaning simultaneously opens, and the oxygen among the oxygen house steward 42 flows into absorber F, and absorber F is carried out reverse cleaning.
Certainly, only as example, it all is feasible that those skilled in the art are provided with arbitrarily according to actual conditions in the setting of above-mentioned time period, and the present invention need not this to limit.
Use the present invention and can bring following benefit:
1, the present invention only need be provided with two groups of air blasts, continuously to six absorber air feed, does not exist the air blast exhaust to be interrupted emptying and additional compressed air loss by two groups of air blasts; When absorber pressure is lower than atmospheric pressure, directly from atmosphere, suck the part material air, use the situation of (3 cover) with respect to the parallel connection of existing two VPSA systems; The air blast of setting required for the present invention still less; And the capacity of air blast of the present invention is less than two and three VPSA technologies, and is littler by 20%～30% than two and three VPSA technologies usually; Not only reasonably shortened adsorption time, can not cause that also compressed air void tower flow velocity ground increases in the absorber.
2, reducing the air blast capacity, do not increasing in the absorber and reasonably shorten adsorption time under the compressed-air actuated void tower flow rate conditions owing to the present invention; And being provided with three groups of vavuum pumps vacuumizes three absorbers respectively simultaneously; Thereby prolonged the absorber vacuum desorption time; Make adsorption time less than the vacuum desorption time, adsorption time promptly of the present invention and the ratio of vacuum desorption time are less than 1.Because vacuum desorption time ground prolongs the corresponding minimizing of then required vacuum pumping speed.
Table one has been listed existing two, three, five required vacuum pumping speeds of VPSA technology and comparison of the present invention.
Table one:
| Technology | Adsorption time/vacuum desorption time | Vacuum pumping speed |
| Two | 1∶1 | 1 |
| Three | 1.19∶1 | 1.014 |
| Five | 1.22∶1 | 1.041 |
| Six | 0.73∶1 | 0.92 |
3, six VPSA process cycles of the present invention are shorter cycle time, in reality, are generally equal to or less than two VPSA technologies.Selecting with a kind of LiX molecular sieve; Under the identical condition of scale; The consumption of LiX molecular sieve is equal to or slightly less than two VPSA technologies, and the physical dimension of absorber is much littler than two VPSA technologies, but six VPSA technologies of the present invention make system oxygen scale enlarge 10000M
3More than/the h.
More than a kind of vacuum pressure swing adsorption system provided by the present invention has been carried out detailed introduction; Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on the specific embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a Vacuum Pressure Swing Adsorption device is characterized in that, comprises six absorbers, two groups of air blasts independently, and, three groups of vavuum pumps independently; Wherein, Each organizes the arrival end that air blast connects four absorbers respectively; Each organizes the arrival end that vavuum pump connects two absorbers respectively; The arrival end of each absorber and atmosphere are linked to each other by each port of export of organizing two absorbers of vavuum pump connection, and the port of export of each absorber is connected with the product gas tank;
Following steps are carried out in said Vacuum Pressure Swing Adsorption device circulation:
Adsorption step: each is organized air blast and carries compressed air to an absorber of its connection, carry out adsorption treatment by this absorber after, output products gas to product gas tank;
Forward put the pressure step: when current absorber reaches or be stabilized in predetermined maximum pressure, forward put pressure to another absorber that links to each other with its port of export by current absorber;
The vacuum desorption step: the vavuum pump by connecting current absorber vacuumizes current absorber;
Pressurising step: utilize forward the putting of another absorber that links to each other with the current absorber port of export to calm the anger; And the product gas in the product gas tank carries out reverse pressurising to current absorber; And when the pressure of current absorber is lower than atmospheric pressure, from atmosphere, suck raw air;
The ratio of the time of implementation of the time of implementation of said adsorption step and vacuum desorption step is less than 1; The time of implementation of said adsorption step is meant; Absorber begins inspiration compressed air and reaches or be stabilized in time of predetermined maximum pressure to absorber, and the time of implementation of said vacuum desorption step is meant that absorber begins to be evacuated down to clean and finishes required time;
Wherein, Said air blast comprises air blast 1 (AC-1) and air blast 2 (AC-2); Said vavuum pump comprises vavuum pump 1 (VP-1), vavuum pump 2 (VP-2) and vavuum pump 3 (VP-3); Said air blast 1 (AC-1) is through air header 1 (10) and air arm 1 (10A), air arm 2 (10B), air arm 3 (10C), air arm 4 (10D), and the arrival end with absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D) is connected respectively;
Air blast 2 (AC-2) is through air header 2 (11) and air arm 5 (11C), air arm 6 (11D), air arm 7 (11E), air arm 8 (11F), and the arrival end with absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) is connected respectively;
Vavuum pump 1 (VP-1) is through vacuum house steward 1 (20) and vacuum manifold 1 (20A), vacuum manifold 2 (20B), and the arrival end with absorber 1 (A), absorber 2 (B) is connected respectively;
Vavuum pump 2 (VP-2) is through vacuum house steward 2 (21) and vacuum manifold 3 (21C), vacuum manifold 4 (21D), and the arrival end with absorber 3 (C), absorber 4 (D) is connected respectively;
Vavuum pump 3 (VP-3) is through vacuum house steward 3 (22) and vacuum manifold 5 (22E), vacuum manifold 6 (22F), and the arrival end with absorber 5 (E), absorber 6 (F) is connected respectively;
The arrival end of said absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) is through air header 3 (12) and air arm 9 (12A), air arm 10 (12B), air arm 11 (12C), air arm 12 (12D), air arm 13 (12E), air arm 14 (12F) and atmosphere;
The port of export of said absorber 1 (A) and absorber 2 (B), absorber 3 (C) and absorber 4 (D), absorber 5 (E) and absorber 6 (F) is connected by pipeline 1 (40AB), pipeline 2 (40CD), pipeline 3 (40EF) respectively;
The port of export of said absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) also is connected with oxygen house steward's (42) a end through oxygen manifold 1 (41A), oxygen manifold 2 (41B), oxygen manifold 3 (41C), oxygen manifold 4 (41D), oxygen manifold 5 (41E), oxygen manifold 6 (41F);
The port of export of said absorber 1 (A), absorber 2 (B), absorber 3 (C), absorber 4 (D), absorber 5 (E), absorber 6 (F) also is connected with oxygen house steward's (42) a end through oxygen manifold 7 (42A), oxygen manifold 8 (42B), oxygen manifold 9 (42C), oxygen manifold 10 (42D), oxygen manifold 11 (42E), oxygen manifold 12 (42F);
Said oxygen house steward's (42) the other end is connected with product gas tank (VS-1).
2. Vacuum Pressure Swing Adsorption device as claimed in claim 1 is characterized in that, said forward putting presses step to carry out at twice:
Forward putting for the first time pressure is when current absorber reaches or be stabilized in predetermined maximum pressure, forward to put pressure by current absorber to another absorber that links to each other with its port of export;
Forward putting for the second time pressure does, is continued forward to put pressure to another absorber that links to each other with its port of export by current absorber, opens the vavuum pump that connects current absorber simultaneously current absorber is vacuumized.
3. Vacuum Pressure Swing Adsorption device as claimed in claim 2 is characterized in that, said pressurising step is divided and carried out for four times:
Pressurising for the first time does, forward putting that another absorber that links to each other with the current absorber port of export from the port of export input of current absorber flows out for the first time calmed the anger, and the while arrival end of current absorber vacuumizes;
Pressurising for the second time does, forward putting that another absorber that links to each other with the current absorber port of export from the port of export input of current absorber flows out for the second time calmed the anger, and the while arrival end of current absorber sucks raw air from atmosphere;
Pressurising for the third time does, the product gas from the port of export input product gas tank of current absorber, and the arrival end of current absorber continues to suck raw air from atmosphere simultaneously;
The 4th pressurising do, the product gas from the port of export input product gas tank of current absorber, and the arrival end of current absorber receives the compressed air that connected air blast is carried simultaneously.
4. Vacuum Pressure Swing Adsorption device as claimed in claim 3; It is characterized in that; The said absorber that is connected with two groups of air blasts is when the 4th pressurising step of execution and adsorption step; Select the idle air blast of current slot to carry compressed air, and need when other absorber carried compressed air, switch to other air blast and carry compressed air to current absorber at current air blast to current absorber.
5. like claim 1,2,3 or 4 described Vacuum Pressure Swing Adsorption devices, it is characterized in that, also be used in the said vacuum desorption step carrying out:
Clean substep: the vavuum pump by connecting current absorber vacuumizes current absorber, and the product gas in the product gas tank flows into the port of export of current absorber simultaneously, and current absorber is carried out reverse cleaning.
6. Vacuum Pressure Swing Adsorption device as claimed in claim 1; It is characterized in that the inner filling of said absorber LiX molecular sieve and the adsorbent that is used to remove water in air branch, carbon dioxide and other impurity composition are when carrying out adsorption step; Airborne moisture, carbon dioxide, other impurity composition and nitrogen are adsorbed by said LiX molecular sieve and adsorbent; Airborne oxygen is gone out absorber by enrichment as the product air-flow, flows into the product gas tank.
7. Vacuum Pressure Swing Adsorption device as claimed in claim 2 is characterized in that, the said airflow direction of forward putting pressure is identical with compressed-air actuated airflow direction, and through forward putting for the first time pressure, the bed layer pressure of current absorber reduces 10kPa-30kPa.
8. Vacuum Pressure Swing Adsorption device as claimed in claim 5 is characterized in that, after said vacuum desorption step was complete, the bed layer pressure of current absorber was reduced to predetermined minimum pressure.
9. like claim 1 or 3 described Vacuum Pressure Swing Adsorption devices; It is characterized in that; The raw air amount that said absorber sucks from atmosphere is greater than 15%～30% of device technique air capacity, and said plant air amount is separated required processing air capacity sum for absorber clearance space loss air capacity with oxygen nitrogen.
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| CN103058144B (en) * | 2013-01-08 | 2015-05-20 | 北京北大先锋科技有限公司 | Vacuum pressure swing adsorption oxygen generation system and control method thereof |
| CN110252082B (en) * | 2018-03-12 | 2021-11-23 | 国家能源投资集团有限责任公司 | Pressure swing adsorption device |
| CN110052258B (en) * | 2019-06-05 | 2020-11-10 | 北京科技大学 | Heating and vacuum desorption combined adsorber, adsorption and desorption method and application |
| CN110860184B (en) * | 2019-12-06 | 2022-07-12 | 马光俊 | Vacuum pressure swing adsorption system operating under constant pressure and process thereof |
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| US7550030B2 (en) * | 2006-04-03 | 2009-06-23 | Praxair Technology, Inc. | Process and apparatus to recover high purity carbon dioxide |
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| CN101249369A (en) * | 2008-04-07 | 2008-08-27 | 北京科技大学 | Method for multiple-unit coupled vacuum voltage transformation adsorption CO2 between segments |
| CN101531342A (en) * | 2009-01-16 | 2009-09-16 | 北京北大先锋科技有限公司 | Device and method for producing oxygen by means of pressure swing adsorption (PSA) by five beds |
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