CN1730383A - Pressure swing adsorption continuous oxygen generation method - Google Patents
Pressure swing adsorption continuous oxygen generation method Download PDFInfo
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- CN1730383A CN1730383A CN 200510020827 CN200510020827A CN1730383A CN 1730383 A CN1730383 A CN 1730383A CN 200510020827 CN200510020827 CN 200510020827 CN 200510020827 A CN200510020827 A CN 200510020827A CN 1730383 A CN1730383 A CN 1730383A
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Abstract
The invention discloses a method for continuous production oxygen and nitrogen by air as the raw material through pressure swing adsorption, the pressure swing adsorption system includes at least three adsorption columns filled with adsorbents selected from one or more from 13X molecular sieve, 5A molecular sieve, lithium sieve, other oxygen-producing molecular sieve and activated alumina. The method comprises the following steps, entering the raw material air into adsorption column A, completing an adsorption step 2, entering the produced oxygen-enriched air into adsorption column B for second adsorption, thus completing an adsorption step 1, then automatically switching the system to the adsorption step 2, entering pressure reduction equalizing step, desorption step, pressure raising equalizing step, pressurizing step and pressure equalizing step, finally entering the adsorption step 1 again, circulating continuously to obtain the product of oxygen and nitrogen.
Description
Technical field
The present invention relates to the pressure swing adsorption air separation technology field, being specifically related to the air is raw material, produces the oxygen method with pressure swing adsorption.
Background technology
Existing pressure swing adsorption air separates produces oxygen unit no matter be to adopt the vacuum desorption flow process, or the high pressure flow process, all adopts step absorption; When producing the oxygen of higher degree, in order to guarantee the purity of oxygen, sorbent material also fully do not adsorb nitrogen just switch adsorption step enter all press find time or contrary stride rapid, cause oxygen recovery rate low, when producing the oxygen of 93% purity, the rate of recovery of oxygen only is 40%～60% for the higher vacuum flow process of oxygen recovery rate.Release journey when producing the oxygen of 93% purity for oxygen is contrary, and the rate of recovery of oxygen only is 15%～40%.This is to cause pressure swing adsorption air separation oxygenerator energy consumption big, the high major cause of producing of oxygen cost.
The CN1142006C patent disclosure method that adopts two-stage pressure swing adsorption from air, to produce oxygen enrichment, can improve the rate of recovery of oxygen, but owing to adopted two sections series connection absorption, need adsorption tower and intermediate buffering jar more than four, there is the flow process complexity, program-controlled valve is many, the shortcoming that plant construction investment is big, simultaneously since in second section adsorption tower sorbent material fail fully to adsorb nitrogen and cause the sorbent material service efficiency not high.
Summary of the invention
The object of the present invention is to provide a kind of oxygen recovery rate that can effectively improve pressure swing adsorption oxygen making device, reduce the energy consumption of producing oxygen, thereby reduce the method for system oxygen cost.
The present invention adopts and is filled with the molecular sieve by 13X at least three, the 5A molecular sieve, the lithium dimer sieve, in the pressure swing adsorption system of the adsorption bed of the sorbent material that one or more in other system oxygen molecular sieves and activated alumina are formed, raw air at first enters adsorption tower A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, finish adsorption step 2, the oxygen rich air that is produced enters adsorption tower B by sequencing valve and adsorbs once more, finish adsorption step 1, system automatically switches to adsorption step 2 afterwards, after adsorption step 2 is finished, automatically switch to and enter equal voltage drop step, against putting or finding time or (finding time+wash) step and equal voltage rise step.The pressurising step, all press step, enter adsorption step 1 afterwards again, finish at high order adsorption step and to enter when all pressing step, raw air enters the adsorption tower that is in time high order adsorption step, so that the output of the input of raw air and product oxygen keeps continuously, circulation moves continuously and obtains product oxygen and nitrogen like this.By that analogy can five towers, six towers are until the flow process of being made up of multiple adsorption tower more.
In the present invention, the compressed-air manometer that enters adsorption bed is pressed and to be-0.02～1Mpa; All press the end pressure gauge pressure to be-0.5～0.6Mpa; The evacuation pressure gauge pressure be 0Mpa～-0.09Mpa, the sorbent material that adopts multistep absorption to make to load in the adsorption tower enter all press and find time or contrary put (or find time+wash) regeneration step before the abundant nitrogen that adsorbs, improved the service efficiency of sorbent material, oxygen purity is remained in 60%～95% scope also can be adjusted arbitrarily, reduce oxygen content raising oxygen recovery rate in the stripping gas simultaneously, make oxygen recovery rate in 55%～90% scope, and from stripping gas, obtaining rich nitrogen product gas, nitrogen gas purity is 85%～98%.
The present invention adopts and from the air intlet end of adsorption bed adsorption bed to be found time, and in the adsorption tower evacuation step, can select to introduce another adsorption tower all calm the anger or product oxygen carries out the flushing opposite with the adsorption step air flow line to the adsorption tower of finding time.
Of the present inventionly all press step to adopt the adsorption tower outlet that another adsorption tower outlet is all pressed or the adsorption tower import is all pressed another adsorption tower import, or dual mode carry out simultaneously.
Pressurising step of the present invention adopts pressurized air to enter adsorption bed or product oxygen from the adsorption bed import and enters adsorption bed from the adsorption bed exit end and adsorption bed is carried out pressurising or pressurized air and product oxygen simultaneously adsorption tower is carried out pressurising.
The present invention if pressure is higher than normal atmosphere, then increases and contraryly strides suddenly after all voltage drop step finishes, or finds time after contrary the putting again or finds time to add the pressure that flushing reduces adsorption tower after the equal pressure drop, makes the thorough desorb of adsorbent nitrogen, obtains product nitrogen gas.
In large-scale oxygenerator, transformer adsorption system of the present invention can be to be composed in parallel by two or more three towers or the psa unit more than three towers.
The present invention compares with existing separating oxygen from air by means of pressure swing adsorption method, has following evident characteristic:
Adopt twice or twice above repeatedly tandem absorption, improved the utilization ratio of sorbent material, improved the rate of recovery and the oxygen making amount of pressure swing adsorption oxygen making device oxygen, reduced the energy consumption that pressure swing adsorption air separates system oxygen.In technical process, realize the continuous of raw air input and the output of product oxygen, avoided the pressure and the flow rate fluctuation of raw air and product oxygen.When obtaining product oxygen, can obtain the nitrogen of 85%～98% purity as the second product gas.
Description of drawings
Fig. 1 is the process flow sheet of the embodiment of the invention 1.
Fig. 2 is the process flow sheet of the embodiment of the invention 2.
Fig. 3 is the process flow sheet of the embodiment of the invention 3.
Fig. 4 is the process flow sheet of the embodiment of the invention 4.
Fig. 5 is the process flow sheet of the embodiment of the invention 5.
Fig. 6 is the process flow sheet of the embodiment of the invention 6.
Fig. 7 is the process flow sheet of the embodiment of the invention 7.
Fig. 8 is the embodiment of the invention 1,2,4 processing step working procedure table.
Fig. 9 is the processing step working procedure table of the embodiment of the invention 3.
Figure 10 is the processing step working procedure table of the embodiment of the invention 5.
Figure 11 is the processing step working procedure table of the embodiment of the invention 6.
Figure 12 is the processing step working procedure table of the embodiment of the invention 7.
Wherein, the Reference numeral among Fig. 8 is:
A1---adsorption step 1, further absorption is sent nitrogen in the oxygen rich air here to obtain product oxygen by adsorption step 2, and the nitrogen that directly adsorbs in the rear section of adsorption step 1 in the raw air obtains product oxygen.
A2---adsorption step 2, the nitrogen in the absorption raw air, and deliver to adsorption step 1 further adsorption of nitrogen.
The equal voltage drop step of ED---, the oxygen rich gas after absorption 2 steps are finished in the adsorption tower is transported to the low pressure adsorption tower after finding time to finish.
The equal voltage rise step of ER---improves the pressure of the back adsorption tower of finding time with the gas of equal voltage drop step.
The V---evacuation step utilizes vacuum pump to reduce the pressure of adsorption tower after the equal pressure drop, makes the nitrogen of absorption separate the sucking-off sorbent material and obtain product nitrogen gas.
Reference numeral among Fig. 9 is:
A1---adsorption step 1, further absorption is sent nitrogen in the oxygen rich air here to obtain product oxygen by adsorption step 2, and the nitrogen that directly adsorbs in the rear section of adsorption step 1 in the raw air obtains product oxygen.
A2---adsorption step 2, the nitrogen in the absorption raw air, and deliver to adsorption step 1 further adsorption of nitrogen.
The equal voltage drop step of ED---, the oxygen rich gas after absorption 2 steps are finished in the adsorption tower is transported to the low pressure adsorption tower after finding time to finish.
The equal voltage rise step of ER---improves the pressure of the back adsorption tower of finding time with the gas of equal voltage drop step.
The V---evacuation step utilizes vacuum pump to reduce the pressure of adsorption tower after the equal pressure drop, makes the nitrogen of absorption separate the sucking-off sorbent material and obtain product nitrogen gas.
CX---is finding time latter stage, utilizes introducing few products oxygen that sorbent material is washed, and makes adsorbent nitrogen desorb more thorough.
Reference numeral among Figure 10 is:
A1---adsorption step 1, further absorption is sent nitrogen in the oxygen rich air here to obtain product oxygen by adsorption step 2, and the nitrogen that directly adsorbs in the rear section of adsorption step 1 in the raw air obtains product oxygen.
A2---adsorption step 2, the nitrogen in the absorption raw air, and deliver to adsorption step 1 further adsorption of nitrogen.
The equal voltage drop step of ED---, the oxygen rich gas after absorption 2 steps are finished in the adsorption tower is transported to the low pressure adsorption tower after finding time to finish.
The equal voltage rise step of ER---improves the pressure of the back adsorption tower of finding time with the gas of equal voltage drop step.
D---is contrary to stride suddenly, reduces the pressure of adsorption tower after the equal pressure drop, makes the nitrogen of absorption separate the sucking-off sorbent material and obtain product nitrogen gas.
Reference numeral among Figure 11 is:
A1---adsorption step 1, further absorption is sent nitrogen in the oxygen rich air here to obtain product oxygen by adsorption step 2, and the nitrogen that directly adsorbs in the rear section of adsorption step 1 in the raw air obtains product oxygen.
A2---adsorption step 2, the nitrogen in the absorption raw air, and deliver to adsorption step 1 further adsorption of nitrogen.
The equal voltage drop step of ED---, the oxygen rich gas after absorption 2 steps are finished in the adsorption tower is transported to the low pressure adsorption tower after finding time to finish.
The equal voltage rise step of ER---improves the pressure of the back adsorption tower of finding time with the gas of equal voltage drop step.
D---is contrary to stride suddenly, reduces the pressure of adsorption tower after the equal pressure drop, makes the nitrogen of absorption separate the sucking-off sorbent material and obtain product nitrogen gas.
CX---utilizes introducing few products oxygen that sorbent material is washed after contrary putting, and makes adsorbent nitrogen desorb more thorough.
Reference numeral among Figure 12 is:
A1---adsorption step 1, further absorption is sent nitrogen in the oxygen rich air here to obtain product oxygen by adsorption step 2, and the nitrogen that directly adsorbs in the rear section of adsorption step 1 in the raw air obtains product oxygen.
A2---adsorption step 2 adsorbs once more by adsorption step 3 and sends the nitrogen in the oxygen rich air here and deliver to adsorption step 1 further adsorption of nitrogen.
A3---adsorption step 3, the nitrogen in the absorption raw air, and deliver to adsorption step 2 adsorption of nitrogen once more.
The equal voltage drop step of ED---, the oxygen rich gas after absorption 2 steps are finished in the adsorption tower is transported to the low pressure adsorption tower after finding time to finish.
The equal voltage rise step of ER---improves the pressure of the back adsorption tower of finding time with the gas of equal voltage drop step.
The V---evacuation step utilizes vacuum pump to reduce the pressure of adsorption tower after the equal pressure drop, makes the nitrogen of absorption separate the sucking-off sorbent material and obtain product nitrogen gas.
CX---is finding time latter stage, utilizes introducing few products oxygen that sorbent material is washed, and makes adsorbent nitrogen desorb more thorough.
Embodiment
The invention will be further described to utilize following examples below
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 20.9 | 78 | 1.1 | 100 |
Raw air temperature :≤40 ℃
Raw air pressure: 0.00Mpa, adsorption tower adsorption step pressure-0.02Mpa.
Whole the adsorption column pressure :-0.09Mpa of vacuum desorption
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 3 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump, oxygen compressor.Raw air is sucked this device by the product oxygen compressor, enter adsorption tower A from bottom to up by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, oxygen level is higher than 80% product oxygen and flows out adsorption tower after the oxygen compressor pressurization through KV2B, behind product oxygen surge tank steady pressure, export pressure swing adsorption oxygen making device again, meanwhile adsorption tower C is found time to adsorption tower by vacuum pump by opening sequencing valve KV4C, and nitrogenous 98% the nitrogen product gas of finding time to obtain is exported pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; Saturated or when saturated when the absorption of the nitrogen of molecular sieve among the adsorption tower A, close KV1A, KV5A sequencing valve and finish absorption 2 steps of adsorption tower A, opening sequencing valve KV1B raw air enters adsorption tower B and continues to obtain qualified oxygen by sequencing valve KV2B from adsorption tower B, meanwhile close sequencing valve KV4C, open sequencing valve KV3A and KV3C and make the gas among the adsorption tower A flow into adsorption tower C, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower C; Close sequencing valve KV3A and KV3C after all pressures step of adsorption tower A and adsorption tower C is finished, open sequencing valve KV2C adsorption tower C is carried out pressurising.Opening sequencing valve KV4A simultaneously utilizes vacuum pump to the adsorption tower A product nitrogen gas of finding time to find time equally to obtain; After adsorption tower C pressurising is finished, close sequencing valve KV2B, open that sequencing valve KV5B makes adsorption tower B enter absorption 2 steps, adsorption tower C enters absorption 1 step raw air this moment and enters adsorption tower B, obtain product oxygen mutually from the non-absorption of adsorption tower C.According to the rule of this narration and the processing step working procedure table of Fig. 8, the oxygen that can obtain 80% purity and the nitrogen of 98% purity move in circles.
The raw air of embodiment 2 is formed % (V) (butt does not comprise water)
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 21 | 78 | 1 | 100 |
Raw air temperature :≤40 ℃
Raw air pressure: 0.02Mpa
Whole the adsorption column pressure :-0.06Mpa of vacuum desorption
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 3 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank, 1 vacuum tank and corresponding pipeline and sequencing valve and vacuum pump.0.02Mpa pressurized air enter this device, enter adsorption tower A from bottom to up by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, oxygen level is higher than 87% product oxygen and flows out adsorption tower after export pressure swing adsorption oxygen making device behind the product oxygen surge tank steady pressure through KV2B, meanwhile adsorption tower C is found time to adsorption tower by vacuum pump by opening sequencing valve KV4C, and nitrogenous 90% the nitrogen product gas of finding time to obtain is exported pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; Saturated or when saturated when the absorption of the nitrogen of molecular sieve among the adsorption tower A, close KV1A, KV5A sequencing valve and finish absorption 2 steps of adsorption tower A, opening sequencing valve KV1B raw air enters adsorption tower B and continues to obtain qualified oxygen by sequencing valve KV2B from adsorption tower B, meanwhile close sequencing valve KV4C, open sequencing valve KV3A and KV3C and make the gas among the adsorption tower A flow into adsorption tower C, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower C; Close sequencing valve KV3A and KV3C after all pressures step of adsorption tower A and adsorption tower C is finished, open sequencing valve KV2C adsorption tower C is carried out pressurising.Opening sequencing valve KV4A simultaneously utilizes vacuum pump to the adsorption tower A product nitrogen gas of finding time to find time equally to obtain; After adsorption tower C pressurising is finished, close sequencing valve KV2B, open that sequencing valve KV5B makes adsorption tower B enter absorption 2 steps, adsorption tower C enters absorption 1 step raw air this moment and enters adsorption tower B, obtain product oxygen mutually from the non-absorption of adsorption tower C.According to rule and Fig. 8 processing step working procedure table of this narration, the oxygen that can obtain 87% purity and the nitrogen of 90% purity move in circles.
The raw air of embodiment 3 is formed % (V) (butt does not comprise water)
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 21 | 78 | 1 | 100 |
Raw air temperature :≤45 ℃
Raw air pressure: 0.04Mpa
Whole the adsorption column pressure :-0.04Mpa of vacuum desorption
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 3 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.0.02Mpa pressurized air enter this device, enter adsorption tower A from bottom to up by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, oxygen level is higher than 93% product oxygen and flows out adsorption tower after export pressure swing adsorption oxygen making device behind the product oxygen surge tank steady pressure through KV2B, meanwhile adsorption tower C is found time to adsorption tower by vacuum pump by opening sequencing valve KV4C, open sequencing valve KV2C in the later stage of finding time and introduce oxygen to the adsorption tower C flushing of finding time, nitrogenous 90% the nitrogen product gas of finding time to obtain is exported pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; Absorption 2 steps that KV1A, KV5A sequencing valve finish adsorption tower A are closed in the nitrogen absorption that is adsorbed onto molecular sieve among the adsorption tower A when saturated, opening sequencing valve KV1B raw air enters adsorption tower B and continues to obtain qualified oxygen by sequencing valve KV2B from adsorption tower B, meanwhile open sequencing valve KV3A and KV3C and make the gas among the adsorption tower A flow into adsorption tower C, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower C; Close sequencing valve KV3A and KV3C after all pressures step of adsorption tower A and adsorption tower C is finished, open sequencing valve KV2C adsorption tower C is carried out pressurising.Open sequencing valve KV4A simultaneously and utilize vacuum pump that adsorption tower A is found time, open sequencing valve KV2A introducing oxygen in the later stage of finding time equally adsorption tower A is found time to wash, find time to obtain product nitrogen gas; After adsorption tower C pressurising is finished, close sequencing valve KV2B, open that sequencing valve KV5B makes adsorption tower B enter absorption 2 steps, adsorption tower C enters rule and Fig. 9 processing step working procedure table of absorption 1 step according to this narration, the oxygen that can obtain 93% purity and the nitrogen of 90% purity move in circles.
Embodiment 4: the raw air of embodiment 4 is formed % (V) (butt does not comprise water)
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 21 | 78 | 1 | 100 |
Raw air temperature :≤45 ℃
Raw air pressure: 0.05Mpa
Whole the adsorption column pressure :-0.03Mpa of vacuum desorption
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 3 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.0.05Mpa raw air enter this device, enter adsorption tower A from bottom to up by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, oxygen level is higher than 90% product oxygen and flows out adsorption tower after export pressure swing adsorption oxygen making device behind the product oxygen surge tank steady pressure through KV2B, meanwhile adsorption tower C is found time to adsorption tower by vacuum pump by opening sequencing valve KV4C, and nitrogenous 95% the nitrogen product gas of finding time to obtain is exported pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; Saturated or when saturated when the absorption of the nitrogen of molecular sieve among the adsorption tower A, close KV1A, KV5A sequencing valve and finish absorption 2 steps of adsorption tower A, opening sequencing valve KV1B raw air enters adsorption tower B and continues to obtain qualified oxygen by sequencing valve KV2B from adsorption tower B, meanwhile close sequencing valve KV4C, open sequencing valve KV3A and KV3C and make the gas among the adsorption tower A flow into adsorption tower C, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower C; Close sequencing valve KV3A and KV3C after all pressures step of adsorption tower A and adsorption tower C is finished, open sequencing valve KV2C adsorption tower C is carried out pressurising.Opening sequencing valve KV4A simultaneously utilizes vacuum pump to the adsorption tower A product nitrogen gas of finding time to find time equally to obtain; After adsorption tower C pressurising is finished, close sequencing valve KV2B, open that sequencing valve KV5B, KV2C make adsorption tower B enter absorption 2 steps, adsorption tower C enters absorption 1 step raw air this moment and enters adsorption tower B, obtain product oxygen mutually from the non-absorption of adsorption tower C.According to rule and Fig. 9 processing step working procedure table of this narration, the oxygen that can obtain 90% purity and the nitrogen of 95% purity move in circles.
Embodiment 5:
The raw air of embodiment 5 is formed % (V) (butt does not comprise water)
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 21 | 78 | 1 | 100 |
Raw air temperature :≤45 ℃
Raw air pressure: 0.3Mpa
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 3 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve.0.3Mpa raw air enter this device, enter adsorption tower A from bottom to up by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, oxygen level is higher than 85% product oxygen and flows out adsorption tower after export pressure swing adsorption oxygen making device behind the product oxygen surge tank steady pressure through KV2B, meanwhile adsorption tower C carries out contrary putting by opening sequencing valve KV4C, and contrary nitrogenous 90% the nitrogen product gas that obtains of putting is exported pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; Saturated or when saturated when the absorption of the nitrogen of molecular sieve among the adsorption tower A, close KV1A, KV5A sequencing valve and finish absorption 2 steps of adsorption tower A, opening sequencing valve KV1B raw air enters adsorption tower B and continues to obtain qualified oxygen by sequencing valve KV2B from adsorption tower B, meanwhile close sequencing valve KV4C, open sequencing valve KV3A and KV3C and make the gas among the adsorption tower A flow into adsorption tower C, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower C; Close sequencing valve KV3A and KV3C after all pressures step of adsorption tower A and adsorption tower C is finished, open sequencing valve KV2C adsorption tower C is carried out pressurising.Opening sequencing valve KV4A simultaneously carries out obtaining product nitrogen gas suddenly against rapid same contrary the strideing of strideing to adsorption tower A; After adsorption tower C pressurising is finished, close sequencing valve KV2B, open that sequencing valve KV5B makes adsorption tower B enter absorption 2 steps, adsorption tower C enters absorption 1 step raw air this moment and enters adsorption tower B, obtain product oxygen mutually from the non-absorption of adsorption tower C.According to the rule of this narration and the processing step working procedure table of Figure 10, the oxygen that can obtain 85% purity and the nitrogen of 90% purity move in circles.
Embodiment 6:
The raw air of embodiment 6 is formed % (V) (butt does not comprise water)
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 21 | 78 | 1 | 100 |
Raw air temperature :≤45 ℃
Raw air pressure: 0.6Mpa
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 3 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve.0.6Mpa raw air enter this device, enter adsorption tower A from bottom to up by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, oxygen level is higher than 93% product oxygen and flows out adsorption tower after export pressure swing adsorption oxygen making device behind the product oxygen surge tank steady pressure through KV2B, meanwhile adsorption tower C carries out contrary putting by opening sequencing valve KV4C, the contrary back of putting is opened sequencing valve KV2C adsorption tower C is washed, and contraryly puts and washes nitrogenous 87% the nitrogen product gas that obtains export pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; Saturated or when saturated when the absorption of the nitrogen of molecular sieve among the adsorption tower A, close KV1A, KV5A sequencing valve and finish absorption 2 steps of adsorption tower A, opening sequencing valve KV1B raw air enters adsorption tower B and continues to obtain qualified oxygen by sequencing valve KV2B from adsorption tower B, meanwhile close sequencing valve KV4C, open sequencing valve KV3A and KV3C and make the gas among the adsorption tower A flow into adsorption tower C, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower C; Close sequencing valve KV3A and KV3C after all pressures step of adsorption tower A and adsorption tower C is finished, open sequencing valve KV2C adsorption tower C is carried out pressurising.Open sequencing valve KV4A simultaneously and adsorption tower A is carried out contrary stride suddenly equally finish the back suddenly and open sequencing valve KV2A adsorption tower A is washed, obtain product nitrogen gas against putting with rinse step contrary strideing; After adsorption tower C pressurising is finished, close sequencing valve KV2B, open that sequencing valve KV5B makes adsorption tower B enter absorption 2 steps, adsorption tower C enters absorption 1 step raw air this moment and enters adsorption tower B, obtain product oxygen mutually from the non-absorption of adsorption tower C.According to the rule of this narration and the processing step working procedure table of Figure 11, the oxygen that can obtain 93% purity and the nitrogen of 87% purity move in circles.
Embodiment 7:
The raw air of embodiment 7 is formed % (V) (butt does not comprise water)
| Component | O 2 | N 2 | Other | ∑ |
| Concentration | 21 | 78 | 1 | 100 |
Raw air temperature :≤40 ℃
Raw air pressure: 0.03Mpa
Whole the adsorption column pressure :-0.06Mpa of vacuum desorption
Separating oxygen from air by means of pressure swing adsorption device of the present invention is made of 4 adsorption towers that are filled with activated alumina and adsorbent of molecular sieve and 1 product oxygen surge tank, 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.0.03Mpa pressurized air enter this device, enter adsorption tower A from top to bottom by sequencing valve KV1A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, oxygen rich air enters adsorption tower B from the adsorption bed upper end through sequencing valve KV5A and pipeline, the molecular sieve that nitrogen in the oxygen rich air is adsorbed among the tower B further adsorbs, and enters adsorption tower C through sequencing valve KV5B again the nitrogen in the gas is adsorbed once more.Oxygen level is higher than 95% product oxygen and flows out adsorption tower after export pressure swing adsorption oxygen making device behind the product oxygen surge tank steady pressure through KV2C, meanwhile adsorption tower D is found time to adsorption tower by vacuum pump by opening sequencing valve KV4D, open sequencing valve KV2D in the later stage of finding time adsorption tower D is washed, nitrogenous 96% the nitrogen product gas of finding time to obtain is exported pressure-swing absorption apparatus behind nitrogen buffer tank steady pressure and flow; It is saturated or close absorption 3 steps that KV1A, KV5A sequencing valve finish adsorption tower A when saturated to be adsorbed onto the nitrogen absorption of molecular sieve among the adsorption tower A, opening sequencing valve KV1B raw air simultaneously enters adsorption tower B and still delivers gas to adsorption tower C by sequencing valve KV5B and continue to obtain qualified oxygen, meanwhile open sequencing valve KV3A and KV3D and make the gas among the adsorption tower A flow into adsorption tower D, carry out the equal voltage drop step of adsorption tower A and the equal voltage rise step of adsorption tower D; Close sequencing valve KV3A and KV3D after all pressures step of adsorption tower A and adsorption tower D is finished, open sequencing valve KV2D adsorption tower D is carried out pressurising.Open sequencing valve KV4A simultaneously and utilize vacuum pump that adsorption tower A is found time, at the later stage unlatching sequencing valve KV2A that finds time adsorption tower A is washed and find time to obtain product nitrogen gas equally; After adsorption tower D pressurising is finished, open sequencing valve KV5C, make attached tower B enter absorption 3 steps.Closing sequencing valve KV2C unlatching sequencing valve KV5C makes adsorption tower C enter adsorption step 2.Adsorption tower D enters absorption 1 step according to the rule of this narration and the processing step working procedure table of Figure 12, and the oxygen that can obtain 95% purity and the nitrogen of 96% purity move in circles.
Claims (8)
1, a kind of pressure swing absorption process of producing oxygen with air as raw material, it is characterized in that being filled with molecular sieve by 13X at least three, the 5A molecular sieve, the lithium dimer sieve, in the pressure swing adsorption system of the adsorption tower of the sorbent material that one or more in other system oxygen molecular sieves and activated alumina are formed, raw air at first enters adsorption tower A, airborne water is adsorbed the activated alumina absorption of loading in the bed, airborne nitrogen is by molecular sieve adsorption, finish adsorption step 2, the oxygen rich air that is produced enters adsorption tower B by sequencing valve and adsorbs once more, finish adsorption step 1, obtain product oxygen from the adsorption tower exit end, system automatically switches to adsorption step 2 afterwards, after adsorption step 2 is finished, automatically switch to and enter equal voltage drop step, put through contrary, find time, desorb is carried out in the combination of one or more modes in the flushing, enter equal voltage rise step then. the pressurising step, all press step, enter adsorption step 1 afterwards again, finish at high order adsorption step and to enter that raw air enters the adsorption tower that is in time high order adsorption step when all pressing step, so that the output of the input of raw air and product oxygen keeps continuously, circulation moves continuously and obtains product oxygen and nitrogen like this.
2, pressure swing absorption process according to claim 1 is characterized in that the compressed-air manometer pressure that enters adsorption bed is-0.02～1Mpa; All press the end pressure gauge pressure to be-0.5～0.6Mpa; The evacuation pressure gauge pressure be 0Mpa～-0.09Mpa, pressure-swing absorption apparatus is produced the purity of oxygen and can be adjusted arbitrarily in 60%～95% scope.
3, pressure swing absorption process according to claim 1 and 2, it is characterized in that adsorption bed being found time from the air intlet end of adsorption bed, and in the adsorption tower evacuation step, can select to introduce another adsorption tower all calm the anger or product oxygen carries out the flushing opposite with the adsorption step air flow line to the adsorption tower of finding time.
4, pressure swing absorption process according to claim 1 and 2 is characterized in that all pressing step to adopt the adsorption tower outlet that another adsorption tower outlet is all pressed or the adsorption tower import is all pressed another adsorption tower import, and perhaps dual mode carries out simultaneously.
5, pressure swing absorption process according to claim 1 and 2 is characterized in that the pressurising step adopts pressurized air to enter adsorption bed or product oxygen from the adsorption bed import and enters adsorption bed from the adsorption bed exit end and adsorption bed is carried out pressurising or pressurized air and product oxygen simultaneously adsorption tower is carried out pressurising.
6, pressure swing absorption process according to claim 1 and 2 is characterized in that after equal voltage drop step finishes, if pressure is higher than normal atmosphere, then increases and contraryly strides suddenly, reduces the pressure of adsorption tower after the equal pressure drop.
7, pressure swing absorption process according to claim 5, it is characterized in that contrary stride rapid after, introduce few products oxygen and wash.
8, pressure swing absorption process according to claim 1 and 2 is characterized in that in large-scale oxygenerator, can be to press absorbing unit to compose in parallel by two or more three towers or the change more than three towers one.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103663382A (en) * | 2013-12-13 | 2014-03-26 | 合肥江航飞机装备有限公司 | Filling method for molecular sieve bed in oxygen concentrator |
| CN107261755A (en) * | 2017-07-25 | 2017-10-20 | 杨炯良 | A kind of vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through with product gas transition tank |
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| CN111847388A (en) * | 2020-06-19 | 2020-10-30 | 华中科技大学同济医学院附属同济医院 | Pressure swing adsorption oxygenerator |
| CN115608105A (en) * | 2022-11-08 | 2023-01-17 | 山东佳脉气体工程有限公司 | Variable-path step-by-step pressure-equalizing pressure swing adsorption gas separation method and device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3654661B2 (en) * | 1994-06-02 | 2005-06-02 | 大陽日酸株式会社 | Oxygen generation method by pressure fluctuation adsorption separation method |
| CN1142006C (en) * | 2002-04-29 | 2004-03-17 | 成都天立化工科技有限公司 | Process for enriching oxygen in air by two-stage pressure swing adsorption |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103663382A (en) * | 2013-12-13 | 2014-03-26 | 合肥江航飞机装备有限公司 | Filling method for molecular sieve bed in oxygen concentrator |
| CN107261755A (en) * | 2017-07-25 | 2017-10-20 | 杨炯良 | A kind of vacuum pressure swing adsorption system for oxygen production and its method for producing oxygen through with product gas transition tank |
| CN107261755B (en) * | 2017-07-25 | 2023-07-04 | 杨炯良 | Vacuum pressure swing adsorption oxygen generation system with product gas transition tank and oxygen generation method thereof |
| CN111569607A (en) * | 2020-05-25 | 2020-08-25 | 西南化工研究设计院有限公司 | Treatment method of displacement exhaust gas of flash evaporation kettle of polypropylene device |
| CN111847388A (en) * | 2020-06-19 | 2020-10-30 | 华中科技大学同济医学院附属同济医院 | Pressure swing adsorption oxygenerator |
| CN115608105A (en) * | 2022-11-08 | 2023-01-17 | 山东佳脉气体工程有限公司 | Variable-path step-by-step pressure-equalizing pressure swing adsorption gas separation method and device |
| CN115608105B (en) * | 2022-11-08 | 2023-03-14 | 山东佳脉气体工程有限公司 | Variable-path step-by-step pressure-equalizing pressure swing adsorption gas separation method and device |
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