CN115040979A - Pressure swing adsorption oxygen generation device and oxygen generation method - Google Patents
Pressure swing adsorption oxygen generation device and oxygen generation method Download PDFInfo
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 311
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 239000001301 oxygen Substances 0.000 title claims abstract description 120
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 16
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims description 47
- 238000003795 desorption Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000003584 silencer Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 229910001882 dioxygen Inorganic materials 0.000 claims description 4
- 239000003570 air Substances 0.000 description 49
- 238000012423 maintenance Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0229—Purification or separation processes
- C01B13/0248—Physical processing only
- C01B13/0259—Physical processing only by adsorption on solids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a pressure swing adsorption oxygen generation device and an oxygen generation method, which can directly meet the oxygen pressure and concentration required by the operation of an ozone generator. The oxygen generating device comprises a Roots blower, a Roots vacuum pump, a first adsorption tower and a second adsorption tower; the air is connected with an air inlet of the Roots blower and an air inlet of the Roots vacuum pump, a first control valve is arranged on the first pipeline, and a second control valve is arranged on the second pipeline; the one end of third pipeline is connected to first pipeline, and the other end of third pipeline is connected on roots vacuum pump's the outlet pipeline, is equipped with the fourth control valve on the third pipeline, is equipped with the eleventh control valve on roots vacuum pump outlet pipeline, and the tie point of third pipeline and roots vacuum pump outlet pipeline is located the upper reaches of eleventh control valve. The pressure swing adsorption oxygen generation device and the oxygen generation method can directly reach the oxygen pressure required by the ozone generator without additionally arranging an oxygen pressurizer, thereby reducing the equipment investment and the cost.
Description
Technical Field
The invention relates to the technical field of pressure swing adsorption oxygen generation, in particular to a pressure swing adsorption oxygen generation device and an oxygen generation method.
Background
The ozone generator is a great environmental protection technical equipment encouraging the development of the country and is used for preparing ozone gas (O) 3 ) The apparatus of (1). By the use of O 3 The cleaning property of the composite material makes the composite material widely used in various industries such as tap water plants, municipal sewage plants, chemical wastewater, chemical oxidation and the like.
Ozone is easy to decompose and cannot be stored, and needs to be prepared on site for use (can be stored for a short time under special conditions), so that ozone generators are generally used in places where ozone can be used. The ozone generator is widely applied to the fields of drinking water, sewage, industrial oxidation, food processing and fresh keeping, medicine synthesis, space sterilization and the like. Ozone gas generated by the ozone generator can be directly utilized or mixed with liquid through a mixing device to participate in reaction.
The oxygen is the necessary raw material gas of the ozone generator for generating ozone, and in order to improve the ozone generation efficiency, most of the raw material gas of the ozone generator adopts oxygen or oxygen-enriched air. The current scheme for providing oxygen for the ozone generator mainly comprises two modes of liquid oxygen and pressure swing adsorption oxygen generation. Liquid oxygen is output by a cryogenic air separation device, the cryogenic air separation device is in a super-large-output specification type, the investment is large, the flow operation is complex, the main equipment is multiple, the device comprises an air compressor, a precooler, a purifier, a heat exchanger, an expansion machine, a rectifying tower, an oxygen compressor (or a liquid oxygen pump) and other devices, part of the devices operate at low temperature, the operation, cold insulation, maintenance and other expenses are high, the existing ozone generator using manufacturer does not have a case matched with the cryogenic air separation oxygen generation device, the liquid oxygen is basically purchased outside, the liquid oxygen is stored in a liquid oxygen tank and then vaporized, the use cost is high, and the device is sometimes limited by conditions such as regional transportation.
The pressure swing adsorption oxygen generation is the choice of ozone equipment users, so the ozone generator users adopt the pressure swing adsorption oxygen generator which is commonly used at present to generate oxygen on site.
The working pressure of the ozone generator is 0.095 MPa-0.15 MPa, so according to the characteristic characteristics of the operation of the ozone generator, the prior positive pressure desorption pressure swing adsorption oxygen generator has the disadvantages of more process equipment (air compressors, cold drying machines, suction drying machines, filters and the like), high pressure rise (about 0.5 MPa), high operation energy consumption, low output pressure of negative pressure desorption equipment (generally about 0.015-0.02 MPa), and high investment and maintenance cost of the oxygen generation equipment because the corresponding pressurizing equipment is required to meet the air source requirement of the ozone generator.
Disclosure of Invention
The invention provides a pressure swing adsorption oxygen generation device and an oxygen generation method, based on the principle of negative pressure desorption pressure swing adsorption oxygen generation, the oxygen generation pressure can be increased to the corresponding working pressure range of an ozone generator without an oxygen pressurizer, thereby reducing the equipment investment, the maintenance cost and the cost.
In order to achieve the technical effect, the technical scheme of the pressure swing adsorption oxygen generation device provided by the invention is that the pressure swing adsorption oxygen generation device comprises:
the device comprises a Roots blower, a Roots vacuum pump, a first adsorption tower and a second adsorption tower;
the air is connected with the air inlet of the Roots blower through a first pipeline and is connected with the air inlet of the Roots vacuum pump through a second pipeline, a first control valve is arranged on the first pipeline, and a second control valve is arranged on the second pipeline;
the first pipeline is connected with one end of a third pipeline, the other end of the third pipeline is connected with an air outlet pipeline of the Roots vacuum pump, a fourth control valve is arranged on the third pipeline, an eleventh control valve is arranged on the air outlet pipeline of the Roots vacuum pump, and a connection point of the third pipeline and the air outlet pipeline of the Roots vacuum pump is positioned at the upstream of the eleventh control valve;
a twelfth control valve is arranged on the gas outlet pipeline of the Roots blower, a fourth pipeline positioned at the upstream of the twelfth control valve is connected to the gas outlet pipeline of the Roots blower, one end of the fourth pipeline is connected to the gas outlet pipeline of the Roots blower, the other end of the fourth pipeline is connected to the gas inlet of the first adsorption tower, and a fifth control valve is arranged on the fourth pipeline;
the gas inlet of the first adsorption tower is also connected with one end of a sixth pipeline, the other end of the sixth pipeline is connected to the gas inlet of the Roots vacuum pump, and a sixth control valve is arranged on the sixth pipeline;
the gas inlet of the second adsorption tower is connected with one end of a fifth pipeline, the other end of the fifth pipeline is connected to the gas inlet of the Roots vacuum pump, and a third control valve is arranged on the fifth pipeline;
the gas inlet of the second adsorption tower is also connected with one end of a seventh pipeline, the other end of the seventh pipeline is connected with the fourth pipeline, the connection point of the seventh pipeline and the fourth pipeline is positioned between the gas outlet of the Roots blower and the fifth control valve, and the seventh pipeline is provided with a seventh control valve;
an eighth pipeline is connected between the gas outlet of the first adsorption tower and the gas outlet of the second adsorption tower, and an eighth control valve is arranged on the eighth pipeline;
the gas outlet of the first adsorption tower is connected with a first oxygen outlet pipeline, the gas outlet of the second adsorption tower is connected with a second oxygen outlet pipeline, the first oxygen outlet pipeline is provided with a ninth control valve, and the second oxygen outlet pipeline is provided with a tenth control valve;
the first control valve, the second control valve, the eleventh control valve, and the twelfth control valve are normally open valves, and the remaining control valves are normally closed valves.
The first oxygen gas outlet pipeline and the second oxygen gas outlet pipeline are both connected to an oxygen buffer tank, and the oxygen buffer tank is connected with an ozone generator through a pipeline.
The eighth pipeline is only provided with one eighth control valve, or the eighth pipeline is provided with two eighth control valves and a pressure equalizing tank, and the pressure equalizing tank is positioned between the two eighth control valves.
And a silencer is arranged at the outlet of the gas outlet pipeline of the Roots blower, and a silencer is arranged at the outlet of the gas outlet pipeline of the Roots vacuum pump.
The invention also provides an oxygen generation method based on the pressure swing adsorption oxygen generation device, which comprises the following steps:
1) starting the roots blower and the roots vacuum pump;
2) pressurizing the first adsorption tower for adsorption, evacuating the second adsorption tower for desorption: opening the fifth control valve, closing the twelfth control valve, sucking air by the Roots blower, boosting and conveying the air, entering the first adsorption tower, and starting pressure-charging adsorption; simultaneously evacuating and desorbing the second adsorption tower, namely opening a third control valve, closing the second control valve, evacuating the nitrogen in the second adsorption tower by the Roots vacuum pump, and discharging the nitrogen at high altitude through an air outlet pipeline of the Roots vacuum pump; after the second adsorption tower is pumped out for a set time T1, switching valves, namely opening a fourth control valve and a second control valve, closing a first control valve, an eleventh control valve and a third control valve, performing series connection two-stage pressurizing adsorption on the Roots vacuum pump and the Roots blower, sucking air by the Roots vacuum pump, pressurizing and conveying the air, conveying the air into the Roots blower through the fourth control valve for two-stage pressurizing and conveying the air, then feeding the air into the first adsorption tower for adsorption, opening a ninth control valve after the pressure in the first adsorption tower reaches a set value P, starting to produce oxygen with the pressure of P, and finishing the pressurizing adsorption of the first adsorption tower and the pumping-out desorption of the second adsorption tower when the adsorption of the first adsorption tower reaches an adsorption front set time T2;
3) pressure equalizing and pressure equalizing of the first adsorption tower and the second adsorption tower: switching valves, namely closing the ninth control valve and the fifth control valve, opening the eighth control valve, performing pressure equalization on the first adsorption tower, fully recovering oxygen at the front and rear adsorption sections in the first adsorption tower after pressure equalization, allowing the oxygen to enter the second adsorption tower for pressure equalization, opening the first control valve, the eleventh control valve and the twelfth control valve, closing the fourth control valve, recovering the Roots vacuum pump and the Roots blower to single-stage operation, and finishing the pressure equalization on the first adsorption tower when the pressure equalization of the second adsorption tower reaches the set time T3;
4) pressurizing the second adsorption tower for adsorption, evacuating the first adsorption tower for desorption: opening a seventh control valve, closing a twelfth control valve, sucking air by the Roots blower, boosting and conveying the air, and entering a second adsorption tower to start pressure-charging adsorption; when the second adsorption tower is pressurized for adsorption, the first adsorption tower is pumped out for desorption, namely, the sixth control valve is opened, the second control valve is closed, and nitrogen in the first adsorption tower is pumped out by the Roots vacuum pump and is discharged at high altitude; after the second adsorption tower is pumped out for a set time T1, switching valves, opening the fourth control valve and the second control valve, closing the first control valve, the eleventh control valve and the sixth control valve, and performing series two-stage pressurizing adsorption by the Roots vacuum pump and the Roots blower; air is sucked by the Roots vacuum pump and is pressurized and conveyed, the air is sent to the Roots blower for secondary pressurized conveying, the air enters the second adsorption tower for adsorption, after the pressure in the second adsorption tower reaches a set value P, the tenth control valve is opened, oxygen with the pressure of P is produced, the adsorption of the second adsorption tower reaches the set adsorption front time T2, the pressurized adsorption of the second adsorption tower is completed, and the evacuation and desorption of the first adsorption tower are completed;
5) pressure equalizing and pressure equalizing of the second adsorption tower and pressure equalizing and pressure increasing of the first adsorption tower: switching valves, closing a tenth control valve and a seventh control valve, opening an eighth control valve and a second adsorption tower for pressure equalization, fully recovering oxygen at the tail section of the adsorption front edge in the second adsorption tower after pressure equalization and pressure drop, allowing the oxygen to enter the first adsorption tower for pressure equalization and rise, opening the first control valve, an eleventh control valve and a twelfth control valve, closing a fourth control valve, recovering the Roots vacuum pump and the Roots blower to work in a single stage, and ending the pressure equalization and rise of the first adsorption tower in the second adsorption tower when the pressure equalization and rise of the first adsorption tower reach a set time T3;
6) the circulation is repeated, and oxygen is continuously generated.
When only one eighth control valve is arranged on the eighth pipeline, in the step 3), the adsorption front end section oxygen in the first adsorption tower directly enters the second adsorption tower through the eighth pipeline to realize the pressure drop and the pressure rise of the second adsorption tower, and in the step 5), the adsorption front end section oxygen in the second adsorption tower directly enters the first adsorption tower through the eighth pipeline to realize the pressure drop and the pressure rise of the second adsorption tower;
when the eighth pipeline is provided with two eighth control valves and a pressure equalizing tank, and the pressure equalizing tank is positioned between the two eighth control valves, in the step 3), the adsorption front-edge and tail-edge oxygen in the first adsorption tower firstly enters the pressure equalizing tank for pressure equalizing and then enters the second adsorption tower for pressure equalizing so as to realize pressure equalizing of the first adsorption tower and pressure equalizing of the second adsorption tower, and in the step 5), the adsorption front-edge and tail-edge oxygen in the second adsorption tower firstly enters the pressure equalizing tank for pressure equalizing and then enters the first adsorption tower for pressure equalizing so as to realize pressure equalizing of the second adsorption tower and pressure equalizing of the first adsorption tower.
Air is filtered and then enters the Roots blower or the Roots vacuum pump.
In the step 2) and the step 4), the value of the pressure set value P is 95KPa-165 KPa.
In the step 2), when the adsorption of the first adsorption tower reaches a set time T2, the first adsorption tower is in a saturated state; in the step 4), when the adsorption of the second adsorption tower reaches the set time T2, the second adsorption tower is in a saturated state.
Compared with the prior art, the invention has the following advantages and positive effects: the pressure swing adsorption oxygen generation device and the oxygen generation method are based on the principle of negative pressure desorption pressure swing adsorption oxygen generation, a third pipeline is connected between an air inlet pipeline (namely a first pipeline) of the Roots blower and an air outlet pipeline of the Roots vacuum pump, and a fourth control valve is arranged on the third pipeline, so that two-stage series pressurization of the Roots blower and the Roots vacuum pump is realized, the pressure of the generated oxygen can directly reach the oxygen concentration and pressure required by the operation of the ozone generator, and an oxygen pressurizer is not required to be additionally arranged, so that the equipment investment is reduced, the maintenance cost is reduced, and the cost is reduced; the pressure swing adsorption oxygen generating device and the oxygen generating method can also be applied to other occasions with the required working pressure of 0.095 MPa-0.15 MPa.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the drawings without inventive labor.
FIG. 1 is a schematic diagram of a pressure swing adsorption oxygen generation apparatus according to an embodiment of the present invention;
FIG. 2 is a process flow diagram of a pressure swing adsorption oxygen generation process in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a pressure swing adsorption oxygen generator according to an embodiment of the present invention.
Detailed Description
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1, the pressure swing adsorption oxygen generation apparatus of the embodiment includes a roots blower C101A, a roots vacuum pump C101B, a first adsorption tower T101A and a second adsorption tower T101B;
the air is connected with an air inlet of a Roots blower C101A through a first pipeline 1 and is connected with an air inlet of a Roots vacuum pump C101B through a second pipeline 2, a first control valve KV105 is arranged on the first pipeline 1, and a second control valve KV107 is arranged on the second pipeline 2;
the first pipeline 1 is connected with one end of a third pipeline 3, the other end of the third pipeline 3 is connected with an air outlet pipeline 11 of the Roots vacuum pump C101B, a fourth control valve KV106 is arranged on the third pipeline 3, an eleventh control valve KV108 is arranged on the air outlet pipeline 11 of the Roots vacuum pump C101B, and a connection point of the third pipeline 3 and the air outlet pipeline 11 of the Roots vacuum pump C101B is positioned at the upstream of the eleventh control valve KV 108;
a twelfth control valve KV109 is arranged on the gas outlet pipeline 12 of the Roots blower C101A, the gas outlet pipeline 12 of the Roots blower C101A is connected with a fourth pipeline 4 positioned at the upstream of the twelfth control valve KV109, one end of the fourth pipeline 4 is connected to the gas outlet pipeline 12, the other end of the fourth pipeline 4 is connected with a gas inlet T101A1 of the first adsorption tower T101A, and a fifth control valve KV101A is arranged on the fourth pipeline 4;
the gas inlet T101A1 of the first adsorption tower T101A is also connected with one end of a sixth pipeline 6, the other end of the sixth pipeline 6 is connected with a gas inlet of a Roots vacuum pump C101B, and a sixth control valve KV104A is arranged on the sixth pipeline 6;
the gas inlet T101B1 of the second adsorption tower T101B is also connected with one end of a fifth pipeline 5, the other end of the fifth pipeline 7 is connected with the gas inlet of a Roots vacuum pump C101B, and a third control valve KV104B is arranged on the fifth pipeline 5;
the gas inlet T101B1 of the second adsorption tower T101B is also connected with one end of a seventh pipeline 7, the other end of the seventh pipeline 7 is connected with the fourth pipeline 4, the connection point of the seventh pipeline 7 and the fourth pipeline 4 is positioned between the gas outlet C101A1 of the Roots blower C101A and the fifth control valve KV101A, and the seventh pipeline 7 is provided with a seventh control valve KV 101B;
an eighth pipeline 8 is connected between the air outlet T101A2 of the first adsorption tower T101A and the air outlet T101B2 of the second adsorption tower T101B, and an eighth control valve KV103 is arranged on the eighth pipeline 8;
a gas outlet T101A2 of the first adsorption tower T101A is connected with a first oxygen outlet pipeline 9, a gas outlet T101B2 of the second adsorption tower T101B is connected with a second oxygen outlet pipeline 10, a ninth control valve KV102A is arranged on the first oxygen outlet pipeline 9, and a tenth control valve KV102B is arranged on the second oxygen outlet pipeline 10;
the first control valve KV105, the second control valve KV107, the eleventh control valve KV108 and the twelfth control valve KV109 are normally open valves, and the rest of the control valves are normally closed valves.
The first oxygen outlet pipeline 9 and the second oxygen outlet pipeline 10 are both connected to an oxygen buffer tank V102, and the oxygen buffer tank V102 is connected with an ozone generator GF 101.
The eighth pipeline 8 is provided with only one eighth control valve KV103, or the eighth pipeline 8 is provided with two eighth control valves KV103 and a pressure equalizing tank V101, and the pressure equalizing tank V101 is located between the two eighth control valves KV 103.
Referring to FIG. 2, the pressure swing adsorption oxygen plant described above produces oxygen through the process steps described above in FIG. 2. Specifically, in an oxygen production cycle, the first adsorption towers T101A and T101B are subjected to at least four steps of "adsorption", "pressure equalization", "desorption", and "pressure equalization" wherein the "adsorption" step is a single-stage adsorption followed by a two-stage pressure-increasing adsorption. The switching of the steps is mainly completed by a device control system and each control valve.
The specific oxygen generation method comprises the following steps:
1) starting the Roots blower C101A and the Roots vacuum pump C101B, wherein control valves KV101A, KV102A, KV104A, KV101B, KV102B, KV104B, KV103 and KV106 are normally closed, and control valves KV105, KV109, KV107 and KV108 are normally open;
2) the first adsorption tower T101A is pressurized for adsorption, and the second adsorption tower T101B is evacuated for desorption: opening a fifth control valve KV101A, closing a twelfth control valve KV109, sucking air by a Roots blower C101A, boosting pressure and conveying the air, entering a first adsorption tower T101A, and starting pressure charging adsorption; meanwhile, the second adsorption tower T101B is evacuated for desorption, namely the third control valve KV104B is opened, the second control valve KV107 is closed, nitrogen in the second adsorption tower T101B is evacuated by the Roots vacuum pump C101B and is discharged at high altitude through the air outlet pipeline 11 of the Roots vacuum pump C101B; after the second adsorption tower T101B is evacuated to reach a set time T1, the valves are switched, namely, the fourth control valve KV106 and the second control valve KV107 are opened, the first control valve KV105, the eleventh control valve KV108 and the third control valve KV104B are closed, the Roots vacuum pump C101B and the Roots blower C101A are connected in series to carry out two-stage pressure charging adsorption, at the moment, air is sucked and conveyed by the Roots vacuum pump C101B in a pressurized mode, and is conveyed into the Roots blower C101A through the fourth control valve KV106 in a secondary pressurized mode, and then enters the first adsorption tower T101A for adsorption, after the pressure in the first adsorption tower T101A reaches a set value P, the ninth control valve KV102A is opened, oxygen with the pressure of P is produced, and when the adsorption in the first adsorption tower T101A reaches an adsorption front set time T2, the first adsorption tower T101A is pressurized and the second adsorption tower T101B is evacuated and desorbed;
3) pressure equalizing and pressure equalizing of the first adsorption tower T101A and the second adsorption tower T101B: switching valves, namely closing the ninth control valve KV102A and the fifth control valve KV101A, opening the eighth control valve KV103, performing pressure equalization and pressure drop on the first adsorption tower T101A, fully recovering oxygen at the tail section of the adsorption front in the first adsorption tower T101A after the pressure equalization and entering the second adsorption tower T101B for pressure equalization and pressure rise, opening the first control valve KV105, the eleventh control valve KV108 and the twelfth control valve KV109, closing the fourth control valve KV106, recovering the Roots vacuum pump C101B and the Roots blower C101A to single-stage operation, and finishing the pressure equalization and pressure drop of the first adsorption tower T101A and the pressure equalization and pressure rise of the second adsorption tower T101B for a set time T3;
4) the second adsorption tower T101B is pressurized for adsorption, and the first adsorption tower T101A is evacuated for desorption: opening a seventh control valve KV101B, closing a twelfth control valve KV109, sucking air by a Roots blower C101A, boosting pressure and conveying the air, and enabling the air to enter a second adsorption tower T101B to start pressure charging adsorption; while the second adsorption tower T101B is pressurized for adsorption, the first adsorption tower T101A is evacuated for desorption, namely, the sixth control valve KV104A is opened, the second control valve KV107 is closed, and nitrogen in the first adsorption tower is evacuated by the Roots vacuum pump C101B and discharged at high altitude; after the second adsorption tower T101B is pumped out and reaches the set time T1, the valves are switched, the fourth control valve KV106 and the second control valve KV107 are opened, the first control valve KV105, the eleventh control valve KV108 and the sixth control valve KV104A are closed, and the Roots vacuum pump C101B and the Roots blower C101A are connected in series for two-stage pressurizing adsorption; air is sucked into the Roots vacuum pump C101B for pressurized conveying, and is sent into the Roots blower C101A for secondary pressurized conveying, the air enters the second adsorption tower T101B for adsorption, after the pressure in the second adsorption tower T101B reaches a set value P, the tenth control valve KV102B is opened, oxygen with the pressure of P is produced, the adsorption of the second adsorption tower T101B reaches the adsorption front set time T2, the pressure-charged adsorption of the second adsorption tower T101B and the evacuation and desorption of the first adsorption tower T101A are finished;
5) pressure drop of the second adsorption tower T101B and pressure rise of the first adsorption tower T101A: switching valves, closing a tenth control valve KV102B and a seventh control valve KV101B, opening an eighth control valve KV103 and a second adsorption tower T101B for pressure equalization, fully recovering oxygen at the tail section of the adsorption front in the second adsorption tower T101B after pressure equalization and pressure equalization, entering a first adsorption tower T101A for pressure equalization and rising, opening a first control valve KV105, an eleventh control valve KV108 and a twelfth control valve KV109, closing a fourth control valve KV106, recovering a Roots vacuum pump C101B and a Roots blower C101A to single-stage operation, and finishing the pressure equalization and rising of the first adsorption tower T101A by the second adsorption tower T101B for a set time T3;
6) the oxygen is continuously generated through repeated circulation, and the generated oxygen enters the oxygen buffer tank V102 through the first oxygen outlet pipeline 9 and the second oxygen outlet pipeline 10 and is connected with the ozone generator GF101 through a pipeline for the ozone generator GF101 to work and use.
For the pressure equalizing operation between the first adsorption tower T101A and the second adsorption tower T101B, when only one eighth control valve KV103 is disposed on the eighth pipeline 8, in step 3), after the eighth control valve KV103 is opened, the adsorption front end oxygen in the first adsorption tower T101A directly enters the second adsorption tower T101B through the eighth pipeline 8 to realize the pressure equalizing pressure drop of the first adsorption tower T101A and the pressure equalizing pressure rise of the second adsorption tower T101B; in the step 5), after the eighth control valve KV103 is opened, the oxygen at the adsorption front end section in the second adsorption tower T101B directly enters the first adsorption tower T101A through the eighth pipeline 8 to realize the pressure equalization and drop of the second adsorption tower T101B and the pressure equalization and rise of the first adsorption tower T101A;
since the oxygen pressure required by the ozone generator to work is usually 95KPa-165KPa, the pressure set value P in the above steps 2) and 4) ranges from 95KPa-165KPa, and pressure detection can be performed by arranging a first pressure detection element PT101A at the top of a first adsorption tower T101A and a second pressure detection element PT101B at the top of a second adsorption tower T101B, wherein the specific value of the pressure set value P depends on the specific working condition.
Further, in the step 2), when the adsorption of the first adsorption tower T101A reaches the set time T2, it should be in a saturated state; similarly, in step 4), when the adsorption of the second adsorption tower T101B reaches the set time T2, it is in a saturated state.
Example two
As a more preferable embodiment, unlike the first embodiment, as shown in fig. 3, two eighth control valves KV103 and a pressure equalizing tank V101 are provided on the eighth pipeline 8, and the pressure equalizing tank V101 is located between the two eighth control valves KV 103.
In the step 3), the tail oxygen of the adsorption front in the first adsorption tower T101A enters the pressure equalizing tank V101 for pressure equalization and then enters the second adsorption tower T101B for pressure equalization so as to realize pressure equalization and pressure equalization of the first adsorption tower T101A and the second adsorption tower T101B. Therefore, when the tail oxygen at the front end of the adsorption in the first adsorption tower T101A enters the pressure equalizing tank V101 for pressure equalizing, the eighth control valve KV103 between the pressure equalizing tank V101 and the second adsorption tower T101B is in a closed state, after the pressure equalizing tank V101 is equalized for several seconds, the eighth control valve KV103 between the pressure equalizing tank V101 and the second adsorption tower T101B is opened, and in the pressure equalizing period of the pressure equalizing tank V101, the second adsorption tower T101B can perform vacuumized back flushing operation on the pressure equalizing tank V101 and the second adsorption tower T101B through the Roots vacuum pump C101B so as to improve the purity of oxygen generation. Similarly, in the step 5), the adsorption front end oxygen in the second adsorption tower T101B enters the pressure equalizing tank V101 for pressure equalization first, and then enters the first adsorption tower T101A for pressure equalization to realize pressure equalization and pressure equalization of the second adsorption tower T101B and pressure equalization and increase of the first adsorption tower T101A.
A silencer is arranged at the outlet of the outlet pipe 12 of the Roots blower C101A, and a silencer is arranged at the outlet of the outlet pipe 11 of the Roots vacuum pump C101B. For the sake of distinction, the muffler at the outlet of the outlet line 12 of the roots blower C101A is the first muffler F102A, and the muffler at the outlet of the outlet line 11 of the roots vacuum pump C101B is the second muffler F102B, to reduce noise.
In order to reduce the damage of impurities in the ambient air to the equipment, improve the use reliability of the equipment and prolong the service life, the air in the embodiment is filtered and then enters the roots blower C101A and the second adsorption tower T101B through the first pipeline 1 and the second pipeline 2 respectively, and the air can be filtered in a mode of arranging the air filter F101.
The rest parts and the connection relationship thereof, and the oxygen generation process are the same as the first embodiment, and are not described herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A pressure swing adsorption oxygen generation device is characterized by comprising:
the device comprises a Roots blower, a Roots vacuum pump, a first adsorption tower and a second adsorption tower;
the air is connected with the air inlet of the Roots blower through a first pipeline and is connected with the air inlet of the Roots vacuum pump through a second pipeline, the first pipeline is provided with a first control valve, and the second pipeline is provided with a second control valve;
the first pipeline is connected with one end of a third pipeline, the other end of the third pipeline is connected with an air outlet pipeline of the Roots vacuum pump, a fourth control valve is arranged on the third pipeline, an eleventh control valve is arranged on the air outlet pipeline of the Roots vacuum pump, and a connection point of the third pipeline and the air outlet pipeline of the Roots vacuum pump is positioned at the upstream of the eleventh control valve;
a twelfth control valve is arranged on the gas outlet pipeline of the Roots blower, a fourth pipeline positioned at the upstream of the twelfth control valve is connected to the gas outlet pipeline of the Roots blower, one end of the fourth pipeline is connected to the gas outlet pipeline of the Roots blower, the other end of the fourth pipeline is connected to the gas inlet of the first adsorption tower, and a fifth control valve is arranged on the fourth pipeline;
the gas inlet of the first adsorption tower is also connected with one end of a sixth pipeline, the other end of the sixth pipeline is connected to the gas inlet of the Roots vacuum pump, and a sixth control valve is arranged on the sixth pipeline;
the gas inlet of the second adsorption tower is connected with one end of a fifth pipeline, the other end of the fifth pipeline is connected with the gas inlet of the Roots vacuum pump, and a third control valve is arranged on the fifth pipeline;
the gas inlet of the second adsorption tower is also connected with one end of a seventh pipeline, the other end of the seventh pipeline is connected with the fourth pipeline, the connection point of the seventh pipeline and the fourth pipeline is positioned between the gas outlet of the Roots blower and the fifth control valve, and the seventh pipeline is provided with a seventh control valve;
an eighth pipeline is connected between the air outlet of the first adsorption tower and the air outlet of the second adsorption tower, and an eighth control valve is arranged on the eighth pipeline;
a gas outlet of the first adsorption tower is connected with a first oxygen outlet pipeline, a gas outlet of the second adsorption tower is connected with a second oxygen outlet pipeline, the first oxygen outlet pipeline is provided with a ninth control valve, and the second oxygen outlet pipeline is provided with a tenth control valve;
the first control valve, the second control valve, the eleventh control valve, and the twelfth control valve are normally open valves, and the remaining control valves are normally closed valves.
2. The pressure swing adsorption oxygen plant of claim 1,
the first oxygen gas outlet pipeline and the second oxygen gas outlet pipeline are both connected to an oxygen buffer tank, and the oxygen buffer tank is connected with an ozone generator through a pipeline.
3. The pressure swing adsorption oxygen plant of claim 1,
the eighth pipeline is only provided with one eighth control valve, or the eighth pipeline is provided with two eighth control valves and a pressure equalizing tank, and the pressure equalizing tank is positioned between the two eighth control valves.
4. The pressure swing adsorption oxygen plant of claim 1,
and a silencer is arranged at the outlet of the gas outlet pipeline of the Roots blower, and a silencer is arranged at the outlet of the gas outlet pipeline of the Roots vacuum pump.
5. An oxygen production method based on the pressure swing adsorption oxygen production device of any one of claims 1 to 4, characterized by comprising the steps of:
1) starting the roots blower and the roots vacuum pump;
2) pressurizing the first adsorption tower for adsorption, evacuating the second adsorption tower for desorption: opening the fifth control valve, closing the twelfth control valve, sucking air by the Roots blower, boosting and conveying the air, entering the first adsorption tower, and starting pressure-charging adsorption; simultaneously, the second adsorption tower is evacuated for desorption, namely the third control valve is opened, the second control valve is closed, the nitrogen in the second adsorption tower is evacuated by the Roots vacuum pump and is discharged at high altitude through the gas outlet pipeline; after the second adsorption tower is pumped out for a set time T1, switching valves, namely opening a fourth control valve and a second control valve, closing a first control valve, an eleventh control valve and a third control valve, performing series connection two-stage pressurizing adsorption on the Roots vacuum pump and the Roots blower, sucking air by the Roots vacuum pump, pressurizing and conveying the air, conveying the air into the Roots blower through the fourth control valve for two-stage pressurizing and conveying the air, then feeding the air into the first adsorption tower for adsorption, opening a ninth control valve after the pressure in the first adsorption tower reaches a set value P, starting to produce oxygen with the pressure of P, and finishing the pressurizing adsorption of the first adsorption tower and the pumping-out desorption of the second adsorption tower when the adsorption of the first adsorption tower reaches an adsorption front set time T2;
3) pressure equalizing and pressure equalizing of the first adsorption tower and the second adsorption tower: switching valves, namely closing the ninth control valve and the fifth control valve, opening the eighth control valve, performing pressure equalization on the first adsorption tower, fully recovering oxygen at the front and rear adsorption sections in the first adsorption tower after pressure equalization, allowing the oxygen to enter the second adsorption tower for pressure equalization, opening the first control valve, the eleventh control valve and the twelfth control valve, closing the fourth control valve, recovering the Roots vacuum pump and the Roots blower to single-stage operation, and finishing the pressure equalization on the first adsorption tower when the pressure equalization of the second adsorption tower reaches the set time T3;
4) pressurizing the second adsorption tower for adsorption, evacuating the first adsorption tower for desorption: opening a seventh control valve, closing a twelfth control valve, sucking air by the Roots blower, boosting and conveying the air, and entering a second adsorption tower to start pressure-charging adsorption; when the second adsorption tower is pressurized for adsorption, the first adsorption tower is pumped out for desorption, namely the sixth control valve is opened, the second control valve is closed, and nitrogen in the first adsorption tower is pumped out by the Roots vacuum pump and is discharged at high altitude; after the first adsorption tower is pumped out for a set time T1, switching valves, opening the fourth control valve and the second control valve, closing the first control valve, the eleventh control valve and the sixth control valve, and performing series two-stage pressurizing adsorption by the Roots vacuum pump and the Roots blower; air is sucked by the Roots vacuum pump for pressurized conveying, is sent to the Roots blower for secondary pressurized conveying, enters the second adsorption tower for adsorption, after the pressure in the second adsorption tower reaches a set value P, the tenth control valve is opened, oxygen with the pressure of P is produced, the adsorption of the second adsorption tower reaches the adsorption front edge set time T2, the pressurized adsorption of the second adsorption tower is carried out, and the evacuation and desorption of the first adsorption tower are finished;
5) pressure drop of the second adsorption tower and pressure rise of the first adsorption tower: switching valves, closing a tenth control valve and a seventh control valve, opening an eighth control valve and a second adsorption tower for pressure equalization, fully recovering oxygen at the tail section of the adsorption front edge in the second adsorption tower after pressure equalization and pressure drop, allowing the oxygen to enter the first adsorption tower for pressure equalization and rise, opening the first control valve, an eleventh control valve and a twelfth control valve, closing a fourth control valve, recovering the Roots vacuum pump and the Roots blower to work in a single stage, and ending the pressure equalization and rise of the first adsorption tower in the second adsorption tower when the pressure equalization and rise of the first adsorption tower reach a set time T3;
6) the circulation is repeated, and oxygen is continuously generated.
6. Process for oxygen production according to claim 5, characterized in that,
when only one eighth control valve is arranged on the eighth pipeline, in the step 3), the adsorption front end section oxygen in the first adsorption tower directly enters the second adsorption tower through the eighth pipeline to realize the pressure drop and the pressure rise of the second adsorption tower, and in the step 5), the adsorption front end section oxygen in the second adsorption tower directly enters the first adsorption tower through the eighth pipeline to realize the pressure drop and the pressure rise of the second adsorption tower;
when the eighth pipeline is provided with two eighth control valves and a pressure equalizing tank, and the pressure equalizing tank is located between the two eighth control valves, in the step 3), the adsorption front-end and rear-end oxygen in the first adsorption tower firstly enters the pressure equalizing tank for pressure equalizing and then enters the second adsorption tower for pressure equalizing so as to realize pressure equalizing of the first adsorption tower and pressure equalizing of the second adsorption tower, and in the step 5), the adsorption front-end and rear-end oxygen in the second adsorption tower firstly enters the pressure equalizing tank for pressure equalizing and then enters the first adsorption tower for pressure equalizing so as to realize pressure equalizing of the second adsorption tower and pressure equalizing of the first adsorption tower.
7. The oxygen production process as set forth in claim 5,
air is filtered and then enters the Roots blower or the Roots vacuum pump.
8. The oxygen production process as set forth in claim 5,
the value of the pressure set value P in the step 2) and the step 4) is 95KPa-165 KPa.
9. The oxygen production process as set forth in claim 5,
in the step 2), when the adsorption of the first adsorption tower reaches a set time T2, the first adsorption tower is in a saturated state; in the step 4), when the adsorption of the second adsorption tower reaches the set time T2, the second adsorption tower is in a saturated state.
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