CN113582139B - Air-oxygen alternate purging type ozone separation pressure swing adsorption system and method thereof - Google Patents
Air-oxygen alternate purging type ozone separation pressure swing adsorption system and method thereof Download PDFInfo
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- CN113582139B CN113582139B CN202110748069.2A CN202110748069A CN113582139B CN 113582139 B CN113582139 B CN 113582139B CN 202110748069 A CN202110748069 A CN 202110748069A CN 113582139 B CN113582139 B CN 113582139B
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 605
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 239000001301 oxygen Substances 0.000 title claims abstract description 98
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 98
- 238000010926 purge Methods 0.000 title claims abstract description 98
- 238000000926 separation method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims abstract description 72
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 16
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical class [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 10
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000003463 adsorbent Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003795 desorption Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 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
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 235000014102 seafood Nutrition 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- C01B13/10—Preparation of ozone
- C01B13/11—Preparation of ozone by electric discharge
-
- 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
- B01D53/0407—Constructional details of adsorbing systems
-
- 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
Abstract
The application discloses an air-oxygen alternate purging type ozone separation pressure swing adsorption system and a method thereof, and belongs to the technical field of ozone separation. The device comprises an air inlet pipeline, N groups of adsorption towers, an oxygen purging pipeline and an air outlet pipeline; the air inlet pipeline is used for introducing mixed gas containing ozone; each adsorption tower comprises an adsorption tower port I and an adsorption tower port II; the port I of the adsorption tower is connected with an air inlet pipeline, and a valve is arranged on the connected pipeline; n is more than or equal to 1; each group of adsorption towers at least comprises an adsorption tower A and an adsorption tower B; the adsorption tower port I of the adsorption tower A is connected with an air inlet pipeline, and the adsorption tower port II of the adsorption tower A is connected with the adsorption tower port II of the adsorption tower B through an oxygen purging pipeline; the port I of the adsorption tower B is connected with an air outlet pipeline, and a vacuum pump is arranged on the air outlet pipeline. The application can recover more than 65% of oxygen and increase the ozone concentration of produced gas to more than 50%.
Description
Technical Field
The application belongs to the technical field of ozone separation, and particularly relates to an air-oxygen alternate-purging type ozone separation pressure swing adsorption system and a method thereof.
Background
The ozone oxidation technology has the advantages of strong oxidability, high reaction speed, no secondary pollution in normal conditions and the like, is gradually and widely applied to aspects of drinking water, municipal sewage, industrial wastewater treatment, food processing, seafood processing and the like, and has larger and larger installed capacity. The ozone is generally prepared by a high-frequency discharge method, and in order to improve the discharge efficiency and prolong the service life of an ozone generator, the oxygen concentration is generally required to be more than 95%, and the dew point temperature is lower than-60 ℃. Liquid oxygen with the concentration of 99.9 percent prepared by a cryogenic method or oxygen with the concentration of about 93 percent prepared by a field PSA (pressure swing adsorption) method is generally adopted as raw material gas of an ozone generator in industry. But is limited by the prior ozone generation technology, the effective utilization rate of oxygen is only about 10 percent, and about 90 percent of oxygen and ozone enter the dissolved gas at the rear end together, so that the oxygen consumption cost is greatly increased, and the difficulty of dissolving gas is increased.
In search, chinese patent 201680091548.9 discloses a method of separating ozone from a mixture of oxygen and ozone by feeding the mixture into at least one adsorption bed containing an adsorbent material for adsorbing ozone; the adsorbent bed may be one of four adsorbent beds in a continuous adsorption cycle, producing ozone by recycling unadsorbed oxygen along with make-up oxygen to an ozone generator or using it as a purge gas; an external purge gas is used to desorb ozone into the consumer flow; with four beds, most of the time, two beds are in adsorption mode and the other two are in regeneration/production mode. Although the patent can utilize unadsorbed oxygen and supplementary oxygen to purge the ozone in the adsorption tower again, the vacuum desorption is not adopted, so that the ozone concentration cannot be improved, the purge gas consumption is large, the ozone separation system in the patent is different in the amount of the recycled oxygen at different stages of one period, the oxygen compressor needs to be finely adjusted, and the ozone concentration fluctuation is large.
As another example, in the three-tower vacuum pressure swing adsorption oxygen generating system disclosed in the chinese patent 201710659064.6, a corresponding product gas transition tank is provided corresponding to each adsorption tower, the front high-oxygen concentrated part of the product gas produced in each adsorption oxygen generating process of the adsorption tower enters the product gas buffer tank as the product gas of the oxygen generating system, the rear low-oxygen concentrated part resides in the product gas transition tank according to the produced oxygen concentration gradient, and when the corresponding adsorption tower is transferred into the product gas boosting step, the product gas is boosted as the product gas lifting compressed air backflow adsorption tower. The patent utilizes the product gas in the oxygen production process as an oxygen production system product, improves the oxygen concentration of the product gas, the use efficiency of the adsorbent and the recovery rate of the system oxygen, but does not mention ozone, and cannot be applied to an ozone generation system to prepare high-concentration ozone mixed gas.
Therefore, there is a need to design an ozone generating system or method with high oxygen utilization and high ozone concentration in the produced gas.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of low oxygen utilization rate, low ozone concentration in produced gas and large ozone concentration fluctuation of an ozone generating system or method in the prior art, the application provides an air-oxygen alternate purging type ozone separation pressure swing adsorption system and a method thereof; through reasonable setting of oxygen purging pipeline and its relation of connection with other pipelines and the adsorption tower that links to each other with it to effectively solve the problem that oxygen utilization rate is low, ozone concentration is low and ozone concentration fluctuation is big in the gas production.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the application is as follows:
the application relates to an air-oxygen alternate purging type ozone separation pressure swing adsorption system which comprises an air inlet pipeline, N groups of adsorption towers, an oxygen purging pipeline and an air outlet pipeline; the air inlet pipeline is used for introducing mixed gas containing ozone; each adsorption tower comprises an adsorption tower port I and an adsorption tower port II; the port I of the adsorption tower is connected with an air inlet pipeline, and a valve is arranged on the connected pipeline; n is more than or equal to 1; each group of adsorption towers at least comprises an adsorption tower A and an adsorption tower B; the adsorption tower port I of the adsorption tower A is connected with an air inlet pipeline, and the adsorption tower port II of the adsorption tower A is connected with the adsorption tower port II of the adsorption tower B through an oxygen purging pipeline; the adsorption tower port I of the adsorption tower B is connected with an air outlet pipeline, a vacuum pump is arranged on the air outlet pipeline, and the adsorption tower port II of the adsorption tower B is connected with an air pipeline; the vacuum pump of the present application is different from the vacuum pump used in the conventional ozone separation system, and comprises a water ring type vacuum pump or a jet pump.
Preferably, the n=3; the adsorption towers comprise a first adsorption tower, a second adsorption tower, a third adsorption tower, a fourth adsorption tower, a fifth adsorption tower and a sixth adsorption tower.
Preferably, the air outlet pipe is provided with an air outlet valve and a vacuum pump; the air outlet pipeline is connected with the first adsorption tower port I, the second adsorption tower port I, the third adsorption tower port I, the fourth adsorption tower port I, the fifth adsorption tower port I and the sixth adsorption tower port I respectively, and a first adsorption tower valve II, a second adsorption tower valve II, a third adsorption tower valve II, a fourth adsorption tower valve II, a fifth adsorption tower valve II and a sixth adsorption tower valve II are arranged on the connected pipelines respectively.
Preferably, an air inlet valve is arranged on the air inlet pipe; the air inlet pipeline is connected with the first adsorption tower port I, the second adsorption tower port I, the third adsorption tower port I, the fourth adsorption tower port I, the fifth adsorption tower port I and the sixth adsorption tower port I respectively, and the connected pipelines are provided with a first adsorption tower valve I, a second adsorption tower valve I, a third adsorption tower valve I, a fourth adsorption tower valve I, a fifth adsorption tower valve I and a sixth adsorption tower valve I respectively.
Preferably, the first adsorption tower port II is connected with the second adsorption tower port II through a first oxygen purging pipeline, the third adsorption tower port II is connected with the fourth adsorption tower port II through a second oxygen purging pipeline, and the fifth adsorption tower port II is connected with the sixth adsorption tower port II through a third oxygen purging pipeline; the first oxygen purging pipeline is provided with a first purging valve, the second oxygen purging pipeline is provided with a second purging valve, and the third oxygen purging pipeline is provided with a third purging valve.
Preferably, the device further comprises an exhaust pipeline; the exhaust pipeline is respectively connected with a first adsorption tower port II, a second adsorption tower port II, a third adsorption tower port II, a fourth adsorption tower port II, a fifth adsorption tower port II and a sixth adsorption tower port II, and the connected pipelines are respectively provided with a first adsorption tower valve III, a second adsorption tower valve III, a third adsorption tower valve III, a fourth adsorption tower valve III, a fifth adsorption tower valve III and a sixth adsorption tower valve III;
preferably, the air inlet end of the air pipeline is an air inlet end; an air compressor is arranged on the air pipeline and is used for pumping air into the ozone separation pressure swing adsorption system; the air pipeline is respectively connected with a first adsorption tower port II, a second adsorption tower port II, a third adsorption tower port II, a fourth adsorption tower port II, a fifth adsorption tower port II and a sixth adsorption tower port II, and the connected pipelines are respectively provided with a first adsorption tower valve IV, a second adsorption tower valve IV, a third adsorption tower valve IV, a fourth adsorption tower valve IV, a fifth adsorption tower valve IV and a sixth adsorption tower valve IV. The ozone separation system can also avoid that the residual nitrogen in the adsorption tower is purged by air to influence the concentration of the recycled oxygen, and the residual nitrogen in the air purging can be discharged by the air outlet pipeline for the rear end to be used together with high-concentration ozone through the oxygen purging, so that the problem of nitrogen residue is solved, and the ozone concentration of the air outlet is ensured.
Preferably, the device also comprises a liquid oxygen tank and an ozone generator; the liquid oxygen tank comprises a liquid oxygen output end; the ozone generator comprises a generator input end and a generator output end, wherein the generator input end is connected with the liquid oxygen output end through a gasifier, and the generator output end is connected with an air inlet pipeline; the port II of the adsorption tower is connected with the input end of the generator, and an oxygen compressor is arranged on the connected pipeline.
Preferably, the device further comprises a standby pipeline, wherein the standby pipeline connects the air inlet pipeline with the air outlet pipeline, and a standby valve is arranged on the standby pipeline; and the air outlet end of the air outlet pipeline is provided with a total air outlet valve.
The application relates to an ozone separation pressure swing adsorption method, which is based on an air-oxygen alternating purging type ozone separation pressure swing adsorption system, and each group of adsorption towers are circularly operated, wherein each cycle in the circulating operation comprises an operation I, an operation II, an operation III and an operation IV; the operation I is as follows: introducing the mixed gas containing ozone into the adsorption tower A from the port I of the adsorption tower through an air inlet pipeline, and adsorbing the ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower B from the port II of the adsorption tower through an air pipeline, the ozone adsorption saturated molecular sieve in the adsorption tower B is purged, and the purged air is discharged by an air outlet pipeline for use; the operation II is as follows: the adsorption operation in the operation I is continued by the adsorption tower A, and the outlet gas of the adsorption tower A is introduced into the adsorption tower B from the port II of the adsorption tower through an oxygen purging pipeline, so that ozone and air in the adsorption tower B are purged, and the purged outlet gas is discharged by the outlet gas pipeline for use; the operation III is as follows: introducing the mixed gas containing ozone into an adsorption tower B from an adsorption tower port I through an air inlet pipeline, and adsorbing the ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower A from the port II of the adsorption tower through an air pipeline, the ozone adsorption saturated molecular sieve in the adsorption tower A is purged, and the purged air is discharged by an air outlet pipeline for use; the operation IV is as follows: the adsorption operation in the operation III is continued by the adsorption tower B, and the gas outlet of the adsorption tower B is introduced into the adsorption tower A from the port II of the adsorption tower through an oxygen purging pipeline, so that ozone and air in the adsorption tower A are purged, and the purged gas outlet is discharged by the gas outlet pipeline for use; the operation sequence of each adsorption tower in a single cycle is the same; and the time of the operation II is the same as that of the operation IV.
Preferably, the adsorption towers are provided with 6; the period of each cycle operation is T=2 min-6 min, and the time is sequentially carried out in time sequence in each cycleOperation I, of (2)>Operation II, of (2)>Operations III and->Operation iv of (a); the start time of the single cycle operation of each set of adsorption towers is delayed relative to the start time of the previous set of adsorption towers>
Preferably, the adsorption tower a comprises a first adsorption tower, and the adsorption tower B comprises a second adsorption tower; the single cycle specific operation steps of the first adsorption tower and the second adsorption tower are as follows:
(1) Opening a first adsorption tower valve I, a first adsorption tower valve III, a second adsorption tower valve II and a second adsorption tower valve IV, closing the rest valves of the first adsorption tower and the second adsorption tower and a first purging valve, and operating I;
(2) Opening a first adsorption tower valve I, a second adsorption tower valve II and a first purging valve, and closing the rest valves of the first adsorption tower and the second adsorption tower to perform operation II;
(3) Opening a second adsorption tower valve I, a second adsorption tower valve III, a first adsorption tower valve II and a first adsorption tower valve IV, closing the rest valves of the first adsorption tower and the second adsorption tower and a first purging valve, and operating III;
(4) And opening a valve I of the second adsorption tower, a valve II of the first adsorption tower and a first purging valve, and closing the rest valves of the first adsorption tower and the second adsorption tower to perform operation IV. Taking the first adsorption tower and the second adsorption tower as examples, the operation steps of the rest adsorption towers are similar, the main difference is that specific valves of the switches are different, and the specific valves of the rest adsorption towers correspond to the valve positions of the first adsorption tower and the second adsorption tower, for example: the first adsorption tower valve II corresponds to the third adsorption tower valve II and the fifth adsorption tower valve II, and the second adsorption tower valve II corresponds to the fourth adsorption tower valve II and the sixth adsorption tower valve II.
3. Advantageous effects
Compared with the prior art, the application has the beneficial effects that:
(1) The application relates to an air-oxygen alternate purging type ozone separation pressure swing adsorption system which comprises an air inlet pipeline, a 3N group of adsorption towers, an oxygen purging pipeline and an air outlet pipeline; the air inlet pipeline is used for introducing mixed gas containing ozone; each adsorption tower comprises an adsorption tower port I and an adsorption tower port II; the port I of the adsorption tower is connected with an air inlet pipeline, and a valve is arranged on the connected pipeline; n is more than or equal to 1; each group of adsorption towers at least comprises an adsorption tower A and an adsorption tower B; the adsorption tower port I of the adsorption tower A is connected with an air inlet pipeline, and the adsorption tower port II of the adsorption tower A is connected with the adsorption tower port II of the adsorption tower B through an oxygen purging pipeline; the adsorption tower port I of the adsorption tower B is connected with an air outlet pipeline, a vacuum pump is arranged on the air outlet pipeline, and the adsorption tower port II of the adsorption tower B is connected with an air pipeline; through the arrangement, the adsorption tower connected with the air inlet pipeline can adsorb the introduced ozone-containing mixed gas, the adsorbed ozone can be stored in the adsorption tower, when the adsorption tower B finishes adsorption and needs to desorb ozone, oxygen generated in the adsorption process of the adsorption tower A can be utilized to purge the ozone in the adsorption tower B through the oxygen purging pipeline, meanwhile, the vacuum pump on the air outlet pipeline is utilized to conduct negative pressure desorption on the ozone in the adsorption tower B, the temperature of the desorbed ozone is almost unchanged under the action of the vacuum pump, and the decomposition of the ozone is avoided, so that the blown high-concentration ozone mixed gas is discharged from the air outlet pipeline for the rear end to be used, the ozone concentration in the gas produced by the ozone separation pressure swing adsorption system is effectively improved, in addition, the oxygen purging can also purge the residual nitrogen in the adsorption tower, and the concentration of the recycled oxygen is improved; therefore, the ozone generating system can purge the adsorption tower needing to desorb ozone by utilizing the oxygen generated by other adsorption towers, and simultaneously desorb the ozone in the adsorption tower by utilizing the vacuum pump, so that more than 65% of oxygen can be finally recovered under the combined action of the oxygen and the adsorption tower, the concentration of the generated ozone is increased to more than 50%, the gas dissolving cost is saved, and the efficiency is improved.
(2) The application relates to an ozone separation pressure swing adsorption method, which is based on an air-oxygen alternating purging type ozone separation pressure swing adsorption system, and each group of adsorption towers are circularly operated, wherein each cycle in the circulating operation comprises an operation I, an operation II, an operation III and an operation IV; the operation I is as follows: introducing the mixed gas containing ozone into the adsorption tower A from the port I of the adsorption tower through an air inlet pipeline, and adsorbing the ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower B from the port II of the adsorption tower through an air pipeline, the ozone adsorption saturated molecular sieve in the adsorption tower B is purged, and the purged air is discharged by an air outlet pipeline for use; the operation II is as follows: the adsorption operation in the operation I is continued by the adsorption tower A, and the outlet gas of the adsorption tower A is introduced into the adsorption tower B from the port II of the adsorption tower through an oxygen purging pipeline, so that ozone and air in the adsorption tower B are purged, and the purged outlet gas is discharged by the outlet gas pipeline for use; the operation III is as follows: introducing the mixed gas containing ozone into an adsorption tower B from an adsorption tower port I through an air inlet pipeline, and adsorbing the ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower A from the port II of the adsorption tower through an air pipeline, the ozone adsorption saturated molecular sieve in the adsorption tower A is purged, and the purged air is discharged by an air outlet pipeline for use; the operation IV is as follows: the adsorption operation in the operation III is continued by the adsorption tower B, and the gas outlet of the adsorption tower B is introduced into the adsorption tower A from the port II of the adsorption tower through an oxygen purging pipeline, so that ozone and air in the adsorption tower A are purged, and the purged gas outlet is discharged by the gas outlet pipeline for use; the operation sequence of each adsorption tower in a single cycle is the same; the time of the operation II is the same as that of the operation IV; by the method, the circulating operation of each group of adsorption towers in the ozone generation system can be matched, so that the ozone generation system is in seamless connection with the ozone separation pressure swing adsorption system, and ozone in the target adsorption tower can be purged by continuously utilizing oxygen generated in the adsorption process of other adsorption towers, so that high-concentration ozone mixed gas is continuously produced for the rear end.
Drawings
FIG. 1 is a schematic diagram I of an ozone separation pressure swing adsorption system of the present application;
FIG. 2 is a schematic diagram II of an ozone separation pressure swing adsorption system according to the present application;
FIG. 3 is a state diagram of each adsorption tower in the present application.
In the figure:
100. a first adsorption tower; 101. a port I of the first adsorption tower; 102. a port II of the first adsorption tower; 110. a valve I of the first adsorption tower; 120. a first adsorption tower valve II; 130. a first adsorption column valve III; 140. a first adsorption tower valve IV;
200. a second adsorption tower; 201. a port I of the second adsorption tower; 202. a second adsorption tower port II; 210. a second adsorption tower valve I; 220. a second adsorption tower valve II; 230. a second adsorption column valve III; 240. a second adsorption tower valve IV;
300. a third adsorption tower; 301. a port I of the third adsorption tower; 302. a third adsorption tower port II; 310. a third adsorption tower valve I; 320. a third adsorption tower valve II; 330. a third adsorption column valve III; 340. a third adsorption tower valve IV;
400. a fourth adsorption tower; 401. a port I of the fourth adsorption tower; 402. a fourth adsorption tower port II; 410. a fourth adsorption tower valve I; 420. a fourth adsorption tower valve II; 430. a fourth adsorption column valve III; 440. a fourth adsorption tower valve IV;
500. a fifth adsorption tower; 501. a fifth adsorption tower port I; 502. a fifth adsorption tower port II; 510. a fifth adsorption tower valve I; 520. a fifth adsorption tower valve II; 530. a fifth adsorption tower valve III; 540. a fifth adsorption tower valve IV;
600. a sixth adsorption tower; 601. a sixth adsorption tower port I; 602. a sixth adsorption tower port II; 610. a sixth adsorption tower valve I; 620. a sixth adsorption tower valve II; 630. a sixth adsorption tower valve III; 640. a sixth adsorption tower valve IV;
710. a first oxygen purge line; 711. a first purge valve; 720. a second oxygen purge line; 721. a second purge valve; 730. a third oxygen purge line; 731. a third purge valve;
810. a liquid oxygen tank; 811. a liquid oxygen output; 820. an ozone generator; 821. an input of the generator; 822. the output end of the generator; 830. an oxygen compressor;
910. an air intake line; 911. an air inlet valve; 920. an air outlet pipeline; 921. a vacuum pump; 922. an air outlet valve; 923. a total air outlet valve; 930. a standby pipeline; 931. a standby valve; 940. an exhaust line; 950. an air line; 951. an air compressor; 952. an air inlet end.
Detailed Description
The following detailed description of exemplary embodiments of the application refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which features of the application are identified by reference numerals. The following more detailed description of the embodiments of the application is not intended to limit the scope of the application, as claimed, but is merely illustrative and not limiting of the application's features and characteristics in order to set forth the best mode of carrying out the application and to sufficiently enable those skilled in the art to practice the application. It will be understood that various modifications and changes may be made without departing from the scope of the application as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the application described herein. Furthermore, the background art is intended to illustrate the state of the art and the meaning of the development and is not intended to limit the application or the field of application of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The application is further described below in connection with specific embodiments.
Example 1
As shown in fig. 1-2, the present embodiment provides an air-oxygen alternate purge type ozone separation pressure swing adsorption system, which includes an air pipeline 950, an exhaust pipeline 940, an air inlet pipeline 910, 3 groups of adsorption towers, an oxygen purge pipeline and an air outlet pipeline 920; the air inlet pipeline 910 is used for introducing mixed gas containing ozone; each adsorption tower comprises an adsorption tower port I and an adsorption tower port II; the port I of the adsorption tower is connected with the air inlet pipeline 910, and a valve is arranged on the connected pipeline; each group of adsorption towers at least comprises an adsorption tower A and an adsorption tower B; the adsorption tower port I of the adsorption tower A is connected with the air inlet pipeline 910, the adsorption tower port II of the adsorption tower A is connected with the adsorption tower port II of the adsorption tower B through the oxygen purging pipeline, and the adsorption tower port I of the adsorption tower B is connected with the air outlet pipeline 920; the adsorption columns include a first adsorption column 100, a second adsorption column 200, a third adsorption column 300, a fourth adsorption column 400, a fifth adsorption column 500, and a sixth adsorption column 600. Each adsorption tower, pipeline and valve in this embodiment are made of 316L material resistant to ozone corrosion, and special molecular sieves capable of selectively adsorbing ozone are filled in the adsorption towers, and the molecular sieves are strong in stability and cannot react with ozone and oxygen.
It should be noted that, the adsorption tower a and the adsorption tower B in the embodiment refer to classification of adsorption towers in different connection modes or operation modes at a certain time, and do not represent that the adsorption tower a is always the adsorption tower a at any time; for example, as shown in FIG. 3, inIn the period, the adsorption tower A includes the first adsorption tower 100, the adsorption tower B includes the second adsorption tower 200, and +.>During the period, the adsorption tower a includes a second adsorption tower 200, and the adsorption tower B includes a first adsorption tower 100; the remaining groups of columns are similarly described.
In this embodiment, the air outlet pipeline 920 is provided with an air outlet valve 922 and a vacuum pump 921, and the vacuum pump 921 in this embodiment adopts a water ring type vacuum pump; the outlet pipeline 920 is connected to the first adsorption tower port i 101, the second adsorption tower port i 201, the third adsorption tower port i 301, the fourth adsorption tower port i 401, the fifth adsorption tower port i 501, and the sixth adsorption tower port i 601, and the connected pipelines are respectively provided with a first adsorption tower valve ii 120, a second adsorption tower valve ii 220, a third adsorption tower valve ii 320, a fourth adsorption tower valve ii 420, a fifth adsorption tower valve ii 520, and a sixth adsorption tower valve ii 620.
An air inlet valve 911 is arranged on the air inlet pipeline 910; the air inlet pipeline 910 is connected to the first adsorption tower port i 101, the second adsorption tower port i 201, the third adsorption tower port i 301, the fourth adsorption tower port i 401, the fifth adsorption tower port i 501, and the sixth adsorption tower port i 601, and the connected pipelines are respectively provided with a first adsorption tower valve i 110, a second adsorption tower valve i 210, a third adsorption tower valve i 310, a fourth adsorption tower valve i 410, a fifth adsorption tower valve i 510, and a sixth adsorption tower valve i 610.
The first adsorption tower port II 102 is connected with the second adsorption tower port II 202 through a first oxygen purging pipeline 710, the third adsorption tower port II 302 is connected with the fourth adsorption tower port II 402 through a second oxygen purging pipeline 720, and the fifth adsorption tower port II 502 is connected with the sixth adsorption tower port II 602 through a third oxygen purging pipeline 730; the first oxygen purging pipeline 710 is provided with a first purging valve 711, the second oxygen purging pipeline 720 is provided with a second purging valve 721, and the third oxygen purging pipeline 730 is provided with a third purging valve 731.
The exhaust pipeline 940 is respectively connected with the first adsorption tower port II 102, the second adsorption tower port II 202, the third adsorption tower port II 302, the fourth adsorption tower port II 402, the fifth adsorption tower port II 502 and the sixth adsorption tower port II 602, and the connected pipelines are respectively provided with a first adsorption tower valve III 130, a second adsorption tower valve III 230, a third adsorption tower valve III 330, a fourth adsorption tower valve III 430, a fifth adsorption tower valve III 530 and a sixth adsorption tower valve III 630;
the air inlet end of the air pipeline 950 is an air inlet end 952, and in addition, the desorption air is filtered, dedusted and dried before entering the adsorption tower, and the dew point temperature reaches below-65 ℃; an air compressor 951 is arranged on the air pipeline 950, and the air compressor 951 is used for pumping air into the ozone generating system; the air pipeline 950 is connected to the first adsorption tower port ii 102, the second adsorption tower port ii 202, the third adsorption tower port ii 302, the fourth adsorption tower port ii 402, the fifth adsorption tower port ii 502, and the sixth adsorption tower port ii 602, and the connected pipelines are respectively provided with a first adsorption tower valve iv 140, a second adsorption tower valve iv 240, a third adsorption tower valve iv 340, a fourth adsorption tower valve iv 440, a fifth adsorption tower valve iv 540, and a sixth adsorption tower valve iv 640.
Also included are a liquid oxygen tank 810 and an ozone generator 820; the liquid oxygen tank 810 includes a liquid oxygen output 811; the ozone generator 820 comprises a generator input 821 and a generator output 822, wherein the generator input 821 is connected with the liquid oxygen output 811, and the generator output 822 is connected with the air inlet pipeline 910; the port II of the adsorption tower is connected with the input end 821 of the generator, an oxygen compressor 830 is arranged on a connected pipeline, and an ozone destructor and an emergency discharge pipeline are arranged in front of the oxygen compressor 830; the device also comprises a standby pipeline 930, wherein the standby pipeline 930 connects the air inlet pipeline 910 with the air outlet pipeline 920, and a standby valve 931 is arranged on the standby pipeline 930; the air outlet end of the air outlet pipeline 920 is provided with a total air outlet valve 923; the backup pipeline 930 can cut the adsorption tower out at any time when the system needs to be maintained, restores the original liquid oxygen system and ensures the continuous output of ozone.
The embodiment also provides an ozone separation pressure swing adsorption method, which is based on the air-oxygen alternate purge type ozone separation pressure swing adsorption system in the embodiment, and carries out cyclic operation on each group of adsorption towers, as shown in fig. 3, wherein the cycle of each cyclic operation is t=4min; each cycle in the cycle operation comprises an operation I, an operation II, an operation III and an operation IV; here, the first adsorption tower 100 is taken as an example:
(1) Operation i: opening a first adsorption tower valve I110, a first adsorption tower valve III 130, a second adsorption tower valve II 220 and a second adsorption tower valve IV 240, closing the rest valves of the first adsorption tower 100 and the second adsorption tower 200 and a first purging valve 711, introducing ozone-containing mixed gas into the adsorption tower A from an adsorption tower port I through an air inlet pipeline 910, and adsorbing ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower B from the port II of the adsorption tower through an air pipeline 950, the ozone adsorption saturated molecular sieve in the adsorption tower B is purged, and the purged air is discharged from the air outlet pipeline 920 for use; run time of
(2) Operation II: opening the first adsorption tower valve I110, the second adsorption tower valve II 220 and the first adsorption tower valveThe purging valve 711 closes the rest valves of the first adsorption tower 100 and the second adsorption tower 200, the adsorption tower A continues the adsorption operation in the operation I, and the outlet gas of the adsorption tower A is introduced into the adsorption tower B from the adsorption tower port II through the oxygen purging pipeline to purge the ozone and air in the adsorption tower B, and the purged outlet gas is discharged for use through the outlet gas pipeline 920; run time of
(3) Operation III: opening a second adsorption tower valve I210, a second adsorption tower valve III 230, a first adsorption tower valve II 120 and a first adsorption tower valve IV 140, closing the rest valves of the first adsorption tower 100 and the second adsorption tower 200 and a first purge valve 711, introducing ozone-containing mixed gas into the adsorption tower B from an adsorption tower port I through an air inlet pipeline 910, and adsorbing ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower A from the port II of the adsorption tower through an air pipeline 950, the ozone adsorption saturated molecular sieve in the adsorption tower A is purged, and the purged air is discharged from the air outlet pipeline 920 for use; run time of
(4) Operation IV: opening a second adsorption tower valve I210, a first adsorption tower valve II 120 and a first purging valve 711, closing the rest valves of the first adsorption tower 100 and the second adsorption tower 200, continuing the adsorption operation in the operation III of the adsorption tower B, introducing the outlet gas of the adsorption tower B into the adsorption tower A from an adsorption tower port II through an oxygen purging pipeline, purging ozone and air in the adsorption tower A, and discharging the purged outlet gas through an outlet gas pipeline 920 for use; run time of
The operation sequence of each adsorption tower in a single cycle is the same; and the time of the operation II is the same as that of the operation IV.
The steps (1) to (4) described above are exemplified by the first adsorption column 100 and the second adsorption column 200 only, and are described forThe operation flows of the adsorption towers of the other groups are similar, and the operation sequences of the adsorption towers in a single cycle are the same; the time of the operation II is the same as that of the operation IV; the main difference is that the single cycle operation start time of each group of adsorption towers is delayed relative to the last adsorption towerThus, if the operation times of each set of adsorption columns are compared, each set of adsorption columns includes operations I to IV, except that the latter set of adsorption columns is delayed +.>In the present embodiment, the third adsorption tower (300) and the fourth adsorption tower (400) are the subsequent group of the first adsorption tower (100) and the second adsorption tower (200), and the rest are similar, while delaying->It should be understood that delay +.>Or is understood as being Advance +>n is any integer; if the operation states of 6 adsorption towers at a certain moment are compared, the operation II and the operation IV of the adsorption towers are carried out at any moment, which means that oxygen generated by purging other adsorption towers at any moment purges the target adsorption tower, so that the operation IV of the target adsorption tower is utilized to generate ozone mixed gas with higher concentration, and the whole time axis is observed transversely.
More specifically, although exemplary embodiments of the present application have been described herein, the present application is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the application should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the present specification, definitions, will control. Where a "concentration, temperature, time, or other value or parameter is expressed as a range, preferred range, or as a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, a range of 1-50 should be understood to include any number, combination of numbers, or subranges of numbers selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, as well as all fractional values between the integers described above, such as 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. Regarding sub-ranges, specifically considered are "nested sub-ranges" that extend from any end point within the range. For example, the nested subranges of exemplary ranges 1-50 can include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in another direction. ".
Claims (8)
1. An air-oxygen alternate purging type ozone separation pressure swing adsorption system is characterized by comprising an air inlet pipeline (910), N groups of adsorption towers, an oxygen purging pipeline, an air pipeline (950) and an air outlet pipeline (920); the air inlet pipeline (910) is used for introducing mixed gas containing ozone; each adsorption tower comprises an adsorption tower port I and an adsorption tower port II; the port I of the adsorption tower is connected with an air inlet pipeline (910), and a valve is arranged on the connected pipeline;
each group of adsorption towers at least comprises an adsorption tower A and an adsorption tower B; the adsorption tower port I of the adsorption tower A is connected with an air inlet pipeline (910), and the adsorption tower port II of the adsorption tower A is connected with the adsorption tower port II of the adsorption tower B through an oxygen purging pipeline; the adsorption tower port I of the adsorption tower B is connected with an air outlet pipeline (920), a vacuum pump (921) is arranged on the air outlet pipeline (920), and the adsorption tower port II of the adsorption tower B is connected with an air pipeline (950);
said n=3; the adsorption towers comprise a first adsorption tower (100), a second adsorption tower (200), a third adsorption tower (300), a fourth adsorption tower (400), a fifth adsorption tower (500) and a sixth adsorption tower (600);
the air-oxygen alternate purging type ozone separation pressure swing adsorption system also comprises an exhaust pipeline (940); the exhaust pipeline (940) is respectively connected with a first adsorption tower port II (102), a second adsorption tower port II (202), a third adsorption tower port II (302), a fourth adsorption tower port II (402), a fifth adsorption tower port II (502) and a sixth adsorption tower port II (602), and a first adsorption tower valve III (130), a second adsorption tower valve III (230), a third adsorption tower valve III (330), a fourth adsorption tower valve III (430), a fifth adsorption tower valve III (530) and a sixth adsorption tower valve III (630) are respectively arranged on the connected pipelines;
the air inlet end of the air pipeline (950) is an air inlet end (952); an air compressor (951) is arranged on the air pipeline (950), and the air compressor (951) is used for pumping air into the ozone separation pressure swing adsorption system; the air pipeline (950) is respectively connected with a first adsorption tower port II (102), a second adsorption tower port II (202), a third adsorption tower port II (302), a fourth adsorption tower port II (402), a fifth adsorption tower port II (502) and a sixth adsorption tower port II (602), and the connected pipelines are respectively provided with a first adsorption tower valve IV (140), a second adsorption tower valve IV (240), a third adsorption tower valve IV (340), a fourth adsorption tower valve IV (440), a fifth adsorption tower valve IV (540) and a sixth adsorption tower valve IV (640).
2. The alternating purging type ozone separation pressure swing adsorption system as recited in claim 1 wherein an air outlet valve (922) is provided on said air outlet line (920); the air outlet pipeline (920) is respectively connected with a first adsorption tower port I (101), a second adsorption tower port I (201), a third adsorption tower port I (301), a fourth adsorption tower port I (401), a fifth adsorption tower port I (501) and a sixth adsorption tower port I (601), and a first adsorption tower valve II (120), a second adsorption tower valve II (220), a third adsorption tower valve II (320), a fourth adsorption tower valve II (420), a fifth adsorption tower valve II (520) and a sixth adsorption tower valve II (620) are respectively arranged on the connected pipelines.
3. The alternating purging type ozone separation pressure swing adsorption system as recited in claim 1 wherein an air inlet valve (911) is provided on said air inlet line (910); the air inlet pipeline (910) is respectively connected with a first adsorption tower port I (101), a second adsorption tower port I (201), a third adsorption tower port I (301), a fourth adsorption tower port I (401), a fifth adsorption tower port I (501) and a sixth adsorption tower port I (601), and the connected pipelines are respectively provided with a first adsorption tower valve I (110), a second adsorption tower valve I (210), a third adsorption tower valve I (310), a fourth adsorption tower valve I (410), a fifth adsorption tower valve I (510) and a sixth adsorption tower valve I (610).
4. The alternating air and oxygen purged type ozone separation pressure swing adsorption system of claim 1 wherein the first adsorption column port ii (102) is connected to the second adsorption column port ii (202) by a first oxygen purge line (710), the third adsorption column port ii (302) is connected to the fourth adsorption column port ii (402) by a second oxygen purge line (720), and the fifth adsorption column port ii (502) is connected to the sixth adsorption column port ii (602) by a third oxygen purge line (730); the first oxygen purging pipeline (710) is provided with a first purging valve (711), the second oxygen purging pipeline (720) is provided with a second purging valve (721), and the third oxygen purging pipeline (730) is provided with a third purging valve (731).
5. An air-oxygen alternating purge type ozone separation pressure swing adsorption system according to any of claims 1 to 4, further comprising a liquid oxygen tank (810) and an ozone generator (820); the liquid oxygen tank (810) comprises a liquid oxygen output end (811); the ozone generator (820) comprises a generator input end (821) and a generator output end (822), wherein the generator input end (821) is connected with the liquid oxygen output end (811) through a gasifier, and the generator output end (822) is connected with the air inlet pipeline (910); the port II of the adsorption tower is connected with the input end (821) of the generator, and an oxygen compressor (830) is arranged on the connected pipeline;
and/or further comprises a standby pipeline (930), wherein the standby pipeline (930) connects the air inlet pipeline (910) with the air outlet pipeline (920), and a standby valve (931) is arranged on the standby pipeline (930); the air outlet end of the air outlet pipeline (920) is provided with a total air outlet valve (923).
6. An ozone separation pressure swing adsorption method based on an air-oxygen alternate purge type ozone separation pressure swing adsorption system as claimed in any one of claims 1 to 5, wherein each group of adsorption towers is subjected to cyclic operation, and each cycle in the cyclic operation comprises operation i, operation ii, operation iii and operation iv;
the operation I is as follows: introducing the mixed gas containing ozone into the adsorption tower A from the port I of the adsorption tower through an air inlet pipeline (910), and adsorbing the ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower B from an adsorption tower port II through an air pipeline (950), the ozone adsorption saturated molecular sieve in the adsorption tower B is purged, and the purged air is discharged from an air outlet pipeline (920) for use;
the operation II is as follows: the adsorption operation in the operation I is continued by the adsorption tower A, and the outlet gas of the adsorption tower A is introduced into the adsorption tower B from the port II of the adsorption tower through an oxygen purging pipeline to purge ozone and air in the adsorption tower B, and the purged outlet gas is discharged for use through an outlet gas pipeline (920);
the operation III is as follows: introducing the mixed gas containing ozone into an adsorption tower B from an adsorption tower port I through an air inlet pipeline (910), and adsorbing the ozone in the mixed gas; simultaneously, air is introduced into the adsorption tower A from an adsorption tower port II through an air pipeline (950), the ozone adsorption saturated molecular sieve in the adsorption tower A is purged, and the purged air is discharged from an air outlet pipeline (920) for use;
the operation IV is as follows: the adsorption tower B continues the adsorption operation in the operation III, and the outlet gas of the adsorption tower B is introduced into the adsorption tower A from the port II of the adsorption tower through an oxygen purging pipeline to purge ozone and air in the adsorption tower A, and the purged outlet gas is discharged for use through an outlet gas pipeline (920);
the operation sequence of each adsorption tower in a single cycle is the same; and the time of the operation II is the same as that of the operation IV.
7. The ozone separation pressure swing adsorption method according to claim 6, wherein the adsorption towers are provided with 6; the period of each cycle operation is T, and the time of each cycle is sequentially in time sequenceOperation I of (1),Operation II, of (2)>Operations III and->Operation iv of (a); the start time of the single cycle operation of each set of adsorption towers is delayed relative to the start time of the previous set of adsorption towers>
8. The ozone separation pressure swing adsorption method of claim 7, wherein said adsorption column a comprises a first adsorption column (100) and said adsorption column B comprises a second adsorption column (200); the single cycle specific operation steps of the first adsorption tower (100) and the second adsorption tower (200) are as follows:
(1) Opening a first adsorption tower valve I (110), a first adsorption tower valve III (130), a second adsorption tower valve II (220) and a second adsorption tower valve IV (240), closing the rest valves of the first adsorption tower (100) and the second adsorption tower (200) and a first purging valve (711), and performing operation I;
(2) Opening a first adsorption tower valve I (110), a second adsorption tower valve II (220) and a first purging valve (711), and closing the rest valves of the first adsorption tower (100) and the second adsorption tower (200) to perform operation II;
(3) Opening a second adsorption tower valve I (210), a second adsorption tower valve III (230), a first adsorption tower valve II (120) and a first adsorption tower valve IV (140), and closing the rest valves of the first adsorption tower (100) and the second adsorption tower (200) and a first purging valve (711) to perform operation III;
(4) And opening a second adsorption tower valve I (210), a first adsorption tower valve II (120) and a first purging valve (711), and closing the rest valves of the first adsorption tower (100) and the second adsorption tower (200) to perform operation IV.
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