CN110711458A - Molecular sieve adsorption tower for oxygen production equipment - Google Patents
Molecular sieve adsorption tower for oxygen production equipment Download PDFInfo
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- CN110711458A CN110711458A CN201910902589.7A CN201910902589A CN110711458A CN 110711458 A CN110711458 A CN 110711458A CN 201910902589 A CN201910902589 A CN 201910902589A CN 110711458 A CN110711458 A CN 110711458A
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- molecular sieve
- sieve filter
- adsorption tower
- filter layer
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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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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- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Of Gases By Adsorption (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a molecular sieve adsorption tower for oxygen generation equipment, which comprises an adsorption tower main body, and an air inlet and an air outlet which are respectively formed at the bottom end and the top end of the adsorption tower main body, wherein a molecular sieve filter is arranged in the adsorption tower main body, the molecular sieve filter comprises a plurality of cylindrical molecular sieve filter layers which are coaxially arranged from inside to outside in sequence, a base plate and a cover plate, the bottom end of each molecular sieve filter layer is arranged on the base plate, the top end of each molecular sieve filter layer is arranged on the cover plate, a gas collection cavity is formed between every two adjacent molecular sieve filter layers, an inner cavity is formed by the innermost molecular sieve filter layer in a surrounding manner, and the inner cavity is communicated with the air outlet. The invention is provided with a plurality of molecular sieve filter layers, so that air can be fully contacted with the molecular sieve, the filtering area and the contact area are effectively improved, the molecular sieve filter layers and the gas collection cavity are matched in a circulating manner, the better separation and filtering effect is achieved, and the separation and filtering efficiency and the oxygen content in the gas are improved.
Description
Technical Field
The invention relates to a molecular sieve adsorption tower for oxygen generation equipment, and belongs to the technical field of oxygen generation.
Background
With the improvement of people's living standard and consciousness of disease prevention, oxygen health care and oxygen therapy are being widely used as an effective means for strengthening physique and preventing diseases. The oxygen making equipment adopts pressure swing adsorption technology and utilizes the high pressure adsorption and low pressure desorption of molecular sieve to nitrogen gas to separate oxygen from nitrogen gas from compressed air.
The adsorption tower is an important component in oxygen production technology, and the function and structure of the adsorption tower directly influence the efficiency of oxygen production. The adsorption tower in the current market is filled with the molecular sieve, the structure is simpler, but the adsorption tower has defects in the oxygen production process, if the air enters the tower and circulates linearly, the air is not contacted with the molecular sieve sufficiently, so that the utilization rate of the molecular sieve is reduced, and the oxygen content of the prepared oxygen is low; for example, the molecular sieve is impacted by air for a long time, and the gap is enlarged to cause powder to block a pipeline so as to influence the oxygen production process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the molecular sieve adsorption tower for the oxygen generation equipment, which can improve the oxygen content, improve the utilization rate of the molecular sieve and prolong the service life of the molecular sieve.
In order to achieve the purpose, the invention adopts the following technical scheme: a molecular sieve adsorption tower for oxygen production equipment comprises an adsorption tower main body, and an air inlet and an air outlet which are respectively formed in the bottom end and the top end of the adsorption tower main body, wherein a molecular sieve filter is arranged in the adsorption tower main body and comprises a plurality of cylindrical molecular sieve filter layers which are coaxially arranged from inside to outside in sequence, a base plate and a cover plate, the top end of each molecular sieve filter layer is arranged on the cover plate and is fixed through the cover plate, and the bottom end of each molecular sieve filter layer is sealed through the base plate; and a gas collection cavity is formed between every two adjacent molecular sieve filter layers, an inner cavity is formed inside the innermost molecular sieve filter layer, a cavity formed between the outermost molecular sieve filter layer and the adsorption tower main body is communicated with the gas inlet, the gas outlet pipe of the gas outlet extends into the adsorption tower main body, the cover plate is installed on the gas outlet pipe, and the inner cavity is communicated with the gas outlet.
Preferably, the bedplate includes the base and sets up the first plug tray on the base, the base sets up to ARC structure, makes the air can follow ARC structure's base to the diffusion all around of the outmost molecular sieve filter layer of molecular sieve filter, improves the utilization ratio of molecular sieve, first plug tray sets up to circular structure, the inside of base has dug first cavity, sets up the first ring groove of a plurality of coaxial arrangement in proper order from inside to outside on the first plug tray, first ring groove matches the setting and is connected with the bottom of molecular sieve filter layer with the molecular sieve filter layer one-to-one.
Preferably, the apron includes that the apron is inserted the dish with the second of setting on the apron, second are inserted the dish and are all seted up with outlet duct matched with connecting thread hole, the inside of apron has dug the second cavity along connecting thread hole's axial, the second is inserted the dish and is set up to circular structure, the second is inserted the dish and is set up the second ring groove of a plurality of coaxial arrangement in proper order from inside to outside, the second ring groove matches the setting with molecular sieve filter layer one-to-one and is connected with the top of molecular sieve filter layer.
Preferably, every the top, the bottom voltage-sharing of molecular sieve filter layer are equipped with the ring cover that the structure is the same, all be provided with connecting thread on two internal and external global of ring cover, on two inner faces of first ring groove, on two inner faces of second ring groove, the bottom of molecular sieve filter layer is connected with the first ring groove that the one-to-one matches through connecting thread respectively, the top of molecular sieve filter layer is connected with the second ring groove that the one-to-one matches through connecting thread, makes molecular sieve filter layer, bedplate, apron zonulae occludens firm, and the installation, the dismantlement, the maintenance, the change of each position of molecular sieve filter of being convenient for simultaneously reduces into manufacturing cost.
Preferably, the outer circumferential surface of the extension of the outlet pipe is provided with a connecting thread, and the outlet pipe is connected with the connecting threaded hole through the connecting thread.
Preferably, a connecting plate is uniformly arranged between every two adjacent molecular sieve filtering layers and is of an I-shaped structure, so that the rigidity of the molecular sieve filtering layers is increased, and the impact of air on the molecular sieve filtering layers is reduced.
Preferably, two plates of the connecting plate, which are in contact with the molecular sieve filter layer, are both arranged to be circular arc surface structures attached to the molecular sieve filter layer, and a plurality of air holes are formed in the two plates.
Preferably, a circular ring-shaped uniformly-distributed net layer is arranged between the seat plate and the inner wall of the adsorption tower main body and at the connecting position of the seat plate and the molecular sieve filter layer, and is used for filtering particle dust in air, so that the blockage of the dust in the air on the molecular sieve filter layer can be effectively reduced.
The invention has the beneficial effects that:
1. the invention is provided with a plurality of molecular sieve filter layers, so that air can be fully contacted with the molecular sieve, the filtering area and the contact area are effectively improved, the molecular sieve filter layers and the gas collection cavity are matched in a circulating manner, the better separation and filtering effect is achieved, and the separation and filtering efficiency and the oxygen content in the gas are improved.
2. The invention is provided with the base with the cambered surface structure, so that air enters the adsorption tower body and is uniformly diffused around the outermost molecular sieve filter layer, the linear flow direction of the air from the air inlet to the air outlet is avoided, and the utilization rate of the molecular sieve is improved.
3. According to the invention, the connecting plates with I-shaped structures are uniformly arranged between two adjacent molecular sieve filtering layers, so that the rigidity of the molecular sieve filtering layers is increased, the impact of air on the molecular sieve filtering layers is reduced, the service life of the molecular sieve filtering layers is prolonged, and the oxygen generation efficiency is improved.
4. The molecular sieve filter layer is connected with the seat plate and the cover plate through the connecting threads, so that the molecular sieve filter is compact and stable, the installation, the disassembly, the maintenance and the replacement of all parts of the molecular sieve filter are convenient, and the production cost is reduced.
5. The holes are arranged in the base plate and the cover plate, so that the weight of the molecular sieve filter is greatly reduced, the structural deformation caused by the sagging of the filtering layer of the molecular sieve is greatly reduced, the oxygen generation efficiency is improved, and the installation or the disassembly of the molecular sieve filter is facilitated.
6. The invention is also provided with the uniformly-distributed net layer for filtering the particle dust in the air, so that the blockage of the dust in the air on the molecular sieve filtering layer can be effectively reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view of C-C of FIG. 1;
FIG. 5 is a schematic cross-sectional view taken along line D-D in FIG. 1;
FIG. 6 is an enlarged view at E in FIG. 3;
the method comprises the following steps: 1. adsorption tower main part, 2, the air inlet, 3, the gas outlet, 31, the outlet duct, 4, the molecular sieve filter, 41, the molecular sieve filter layer, 42, the bedplate, 421, the base, 422, first plug-in dish, 423, first cavity, 424, first ring groove, 43, the apron, 431, the lid seat, 432, second plug-in dish, 433, the second cavity, 434, second ring groove, 44, the gas collecting chamber, 45, the inner chamber, 5, connecting screw hole, 6, the connecting plate, 7, the even cloth stratum reticulare.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 6, the molecular sieve adsorption tower for an oxygen generation device provided by the present invention comprises an adsorption tower main body 1, and an air inlet 2 and an air outlet 3 respectively formed at the bottom end and the top end of the adsorption tower main body 1, wherein a molecular sieve filter 4 is installed in the adsorption tower main body 1, the molecular sieve filter 4 comprises a plurality of cylindrical molecular sieve filter layers 41, a base plate 42 and a cover plate 43, which are coaxially installed in sequence from inside to outside, the top end of each molecular sieve filter layer 41 is installed on the cover plate 43 and fixed by the cover plate 43, and the bottom end is sealed by the base plate 42; a gas collecting cavity 44 is formed between every two adjacent molecular sieve filter layers 41, an inner cavity 45 is formed inside the innermost molecular sieve filter layer 41, a cavity formed between the outermost molecular sieve filter layer 41 and the adsorption tower main body 1 is communicated with the gas inlet 2, the air outlet pipe 31 of the air outlet 3 extends towards the interior of the adsorption tower main body 1, the cover plate 43 is arranged on the air outlet pipe 31, the inner cavity 45 is communicated with the air outlet 3, and the plurality of molecular sieve filter layers 41 are arranged from inside to outside in sequence, so that the filtering area and the contact area are effectively increased, air flows to the inner cavity 44 from the molecular sieve filter layer 41 at the outermost side in sequence, the air and the molecular sieve can be fully contacted, the air is separated by the molecular sieve filtering layer 41 and then passes through the enriched oxygen of the gas collecting cavity 44, and the air is circularly matched, so that the air separation and filtration effect is better, the separation and filtration efficiency is improved, and the oxygen purity in the air reaches 95.1%.
As shown in fig. 2 and 4, the seat plate 42 includes a base 421 and a first insert plate 422 provided on the base 421, in this embodiment, the base 421 is of a cambered surface structure, so that air can diffuse around the molecular sieve filter layer 41 at the outermost layer of the molecular sieve filter along the base 421 of the cambered surface structure, the linear flow direction of the air from the air inlet 2 to the air outlet 3 is further avoided, the utilization rate of the molecular sieve is improved, the first insert plate 422 is provided with a circular structure, and a first cavity 423 is dug in the base 421, so that the weight of the base plate 42 is greatly reduced, the molecular sieve filter layer 41 is prevented from sagging, meanwhile, the installation or the disassembly of the molecular sieve filter 4 is facilitated, the first insert disc 422 is provided with a plurality of first circular ring grooves 424 which are coaxially arranged from inside to outside in sequence, the first circular ring grooves 424 are correspondingly arranged with the molecular sieve filter layers 41 one by one and connected with the bottom ends of the molecular sieve filter layers 41.
As shown in fig. 2 and 5, the cover plate 43 includes a cover seat 431 and a second inserting disc 432 arranged on the cover seat 431, in this embodiment, the cover seat 431 and the second inserting disc 432 are both provided with a connecting threaded hole 5 matched with the air outlet pipe 31, a second cavity 433 is dug in the cover seat 431 along the axial direction of the connecting threaded hole 5, the weight of the cover plate 43 is greatly reduced, the weight of the molecular sieve filter 4 is further reduced, the installation or the disassembly of the molecular sieve filter 4 is facilitated, the second inserting disc 432 is arranged in a circular structure, the second inserting disc 432 is provided with a plurality of second annular grooves 434 coaxially arranged from inside to outside in sequence, and the second annular grooves 434 are matched with the molecular sieve filter layers 41 one-to-one and are connected with the top ends of the molecular sieve filter layers 41.
The top end and the bottom end of each molecular sieve filter layer 41 are provided with ring sleeves with the same structure in a pressure-equalizing manner, the inner and outer circumferential surfaces of each ring sleeve, the two inner surfaces of the first ring grooves 424 and the two inner surfaces of the second ring grooves 434 are provided with connecting threads, the bottom end of each molecular sieve filter layer 41 is connected with the first ring grooves 424 which are matched in a one-to-one correspondence manner through the connecting threads, and the top end of each molecular sieve filter layer 41 is connected with the second ring grooves 434 which are matched in a one-to-one correspondence manner through the connecting threads. In this embodiment, the outer peripheral surface of the extension portion of the outlet pipe 31 is provided with connecting threads and is connected with the connecting threaded hole 5 through the connecting threads, so that the molecular sieve filter layer 41, the seat plate 42 and the cover plate 43 are stably connected, the molecular sieve filter 4 and the adsorption tower body 1 are stably connected, the installation, the disassembly, the maintenance and the replacement are convenient, the oxygen generation efficiency is improved, and the production cost is reduced.
As shown in fig. 3 and 6, a connecting plate 6 is uniformly arranged between two adjacent molecular sieve filter layers 41, and the connecting plate 6 is of an i-shaped structure, so that the rigidity of the molecular sieve filter layers 41 is increased, the impact of air on the molecular sieve filter layers 41 is reduced, and the service life of the molecular sieve filter layers is prolonged. In this embodiment, two plates that connecting plate 6 and molecular sieve filter layer 41 contacted all set up to the arc surface structure of laminating mutually with 41 aspect of molecular sieve filter layer, and are provided with a plurality of gas pocket on two plates for connecting plate 6 is balanced to 41 effort dispersions of molecular sieve filter layer, and at the gas pocket that two plates set up, has avoided the jam of connecting plate 6 to molecular sieve filter layer 41.
As shown in fig. 2 and fig. 3, in this embodiment, a circular ring-shaped uniform mesh layer 7 is disposed between the seat plate 42 and the inner wall of the adsorption tower body 1 and at a connection position between the seat plate 42 and the molecular sieve filter layer 41, and the uniform mesh layer 7 is used for filtering particulate dust in air, so that the blockage of the molecular sieve filter layer by the dust in the air can be effectively reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (8)
1. A molecular sieve adsorption tower for oxygen production equipment comprises an adsorption tower main body (1), and an air inlet (2) and an air outlet (3) which are respectively formed in the bottom end and the top end of the adsorption tower main body (1), and is characterized in that a molecular sieve filter (4) is installed in the adsorption tower main body (1), the molecular sieve filter (4) comprises a plurality of cylindrical molecular sieve filter layers (41) which are coaxially arranged from inside to outside in sequence, a seat plate (42) and a cover plate (43), the top end of each molecular sieve filter layer (41) is installed on the cover plate (43) and is fixed through the cover plate (43), and the bottom end of each molecular sieve filter layer is sealed through the seat plate (42); a gas collection cavity (44) is formed between every two adjacent molecular sieve filter layers (41), an inner cavity (45) is formed inside the innermost molecular sieve filter layer (41), a cavity formed between the outermost molecular sieve filter layer (41) and the adsorption tower main body (1) is communicated with the gas inlet (2), the gas outlet pipe (31) of the gas outlet (3) extends towards the inside of the adsorption tower main body (1), the cover plate (43) is installed on the gas outlet pipe (31), and the inner cavity (45) is communicated with the gas outlet (3).
2. The molecular sieve adsorption tower for the oxygen generation equipment according to claim 1, wherein the seat plate (42) comprises a base (421) and a first inserting disc (422) arranged on the base (421), the base (421) is arranged in an arc surface structure, the first inserting disc (422) is arranged in a circular structure, a first cavity (423) is dug in the base (421), a plurality of first circular ring grooves (424) are arranged on the first inserting disc (422) and coaxially arranged from inside to outside in sequence, and the first circular ring grooves (424) are matched with the molecular sieve filter layers (41) in a one-to-one correspondence manner and are connected with the bottom ends of the molecular sieve filter layers (41).
3. The molecular sieve adsorption tower for the oxygen generation equipment according to claim 2, wherein the cover plate (43) comprises a cover seat (431) and a second inserting disc (432) arranged on the cover seat (431), the cover seat (431) and the second inserting disc (432) are both provided with a connecting threaded hole (5) matched with the air outlet pipe (31), a second cavity (433) is dug in the cover seat (431) along the axial direction of the connecting threaded hole (5), the second inserting disc (432) is arranged in a circular structure, the second inserting disc (432) is provided with a plurality of second circular ring grooves (434) which are coaxially arranged from inside to outside in sequence, and the second circular ring grooves (434) are matched with the molecular sieve filter layers (41) in a one-to-one correspondence and are connected with the top ends of the molecular sieve filter layers (41).
4. The molecular sieve adsorption tower for the oxygen generation equipment according to claim 3, wherein the top end and the bottom end of each molecular sieve filter layer (41) are provided with ring sleeves with the same structure in a pressure-equalizing manner, the inner and outer circumferential surfaces of each ring sleeve, the two inner surfaces of the first ring grooves (424), and the two inner surfaces of the second ring grooves (434) are provided with connecting threads, the bottom ends of the molecular sieve filter layers (41) are respectively connected with the first ring grooves (424) which are matched in a one-to-one correspondence manner through the connecting threads, and the top ends of the molecular sieve filter layers (41) are connected with the second ring grooves (434) which are matched in a one-to-one correspondence manner through the connecting threads.
5. The molecular sieve adsorption tower for the oxygen production equipment according to claim 3, wherein the gas outlet pipe (31) is provided with a connecting thread on the outer peripheral surface of the extension thereof and is connected with the connecting threaded hole (5) through the connecting thread.
6. The molecular sieve adsorption tower for the oxygen production equipment according to claim 1, wherein a connecting plate (6) is uniformly arranged between two adjacent molecular sieve filtering layers (41), and the connecting plate (6) is of an I-shaped structure.
7. The molecular sieve adsorption tower for the oxygen generation equipment according to claim 6, wherein two plates of the connection plate (6) contacting the molecular sieve filter layer (41) are both configured to be circular arc surface structures attached to the surface of the molecular sieve filter layer (41), and a plurality of air holes are arranged on the two plates.
8. The molecular sieve adsorption tower for the oxygen generation equipment according to claim 1, wherein a circular ring-shaped uniform distribution net layer (7) is arranged between the seat plate (42) and the inner wall of the adsorption tower body (1) and at the connecting position of the seat plate (42) and the molecular sieve filter layer (41), and the uniform distribution net layer (7) is used for filtering particle dust in air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910902589.7A CN110711458A (en) | 2019-09-24 | 2019-09-24 | Molecular sieve adsorption tower for oxygen production equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910902589.7A CN110711458A (en) | 2019-09-24 | 2019-09-24 | Molecular sieve adsorption tower for oxygen production equipment |
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| CN110711458A true CN110711458A (en) | 2020-01-21 |
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| CN201910902589.7A Pending CN110711458A (en) | 2019-09-24 | 2019-09-24 | Molecular sieve adsorption tower for oxygen production equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117323777A (en) * | 2023-09-28 | 2024-01-02 | 镇江巨茂分子筛有限公司 | Antibacterial oxygen-making molecular sieve equipment and process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205235596U (en) * | 2015-12-01 | 2016-05-18 | 台州创兴环保科技有限公司 | Air purification device strains a subassembly |
| CN110228794A (en) * | 2019-07-29 | 2019-09-13 | 张日文 | The three concentric molecular sieve adsorption oxygen-preparation system of circle of one kind |
-
2019
- 2019-09-24 CN CN201910902589.7A patent/CN110711458A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205235596U (en) * | 2015-12-01 | 2016-05-18 | 台州创兴环保科技有限公司 | Air purification device strains a subassembly |
| CN110228794A (en) * | 2019-07-29 | 2019-09-13 | 张日文 | The three concentric molecular sieve adsorption oxygen-preparation system of circle of one kind |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117323777A (en) * | 2023-09-28 | 2024-01-02 | 镇江巨茂分子筛有限公司 | Antibacterial oxygen-making molecular sieve equipment and process thereof |
| CN117323777B (en) * | 2023-09-28 | 2024-04-05 | 镇江巨茂分子筛有限公司 | Antibacterial oxygen-making molecular sieve equipment and process thereof |
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