CN108310949B - Tail gas recovery equipment for pharmaceutical workshop - Google Patents
Tail gas recovery equipment for pharmaceutical workshop Download PDFInfo
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- CN108310949B CN108310949B CN201810214358.2A CN201810214358A CN108310949B CN 108310949 B CN108310949 B CN 108310949B CN 201810214358 A CN201810214358 A CN 201810214358A CN 108310949 B CN108310949 B CN 108310949B
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/14—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 absorption
- B01D53/1456—Removing acid components
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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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
- B01D53/185—Liquid distributors
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses tail gas recovery equipment for a pharmaceutical workshop, which comprises an air inlet chamber, a purification chamber and an exhaust chamber which are sequentially communicated in a box body along the long axis direction; a plurality of liquid inlet pipes are arranged at the top part in the purifying chamber, and a plurality of spray heads are distributed on the liquid inlet pipes; a circle of mounting plate is arranged on the outer wall of the open end at the top of the liquid collecting tank along the circumferential direction, a plurality of through holes are formed in the mounting plate, and the liquid collecting tank is detachably connected and mounted at the open position at the bottom of the purification chamber through a first sealing bolt in a threaded manner; a plurality of mounting platforms are convexly arranged on a bottom plate in the liquid collecting tank, threaded holes are formed in the ends of the mounting platforms, a plurality of packing columns are mounted on the bottom in the liquid collecting tank, and threaded rods matched with the threaded holes are arranged at one axial ends of the packing columns; two ends of the box body in the long axis direction are respectively provided with two hydraulic jacking rods, and the bottom end of the liquid collecting tank is provided with a travelling wheel. The invention provides a novel horizontal filler waste gas spraying device which is small in size, suitable for primary treatment operation of waste gas in a pharmaceutical production workshop and convenient to carry and operate.
Description
Technical Field
The invention relates to waste gas treatment equipment for medicine production, in particular to tail gas recovery equipment for a pharmaceutical workshop.
Background
With the continuous development of society and medical industry, the pollution problem of the pharmaceutical industry becomes more and more serious. The pollution of the pharmaceutical industry is difficult to control and control, and environmental pollution is easy to cause, which is a big problem difficult to control in environmental improvement. Among them, exhaust gas is one of the pollutions in the pharmaceutical industry, and also brings about related problems in the environmental management of drug administration enterprises. The waste gas spraying tower is a waste gas treatment structure formed by plastic or other fillers, and waste gas is in contact with absorption liquid or microbial films growing on the surfaces of the fillers in a clearance mode, so that the waste gas is purified. The filler spray tower is generally used and is suitable for treating acid-base waste gas or pretreating the acid-base waste gas, and the filler spray tower is used in single-stage or multi-stage series connection,
in present common filler spray column, need set up multistage packing layer along vertical direction in the tower body for improving purification efficiency, in addition, the atomizing system that sprays the absorption liquid generally sets up the top at every layer of packing layer, consequently the packed column is bulky, is not suitable for carrying out preliminary processing operation to waste gas in the pharmaceutical production workshop.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing packed tower is large in size and is not suitable for carrying out primary treatment operation on waste gas in a pharmaceutical production workshop.
The invention is realized by the following technical scheme:
the tail gas recovery equipment for the pharmaceutical workshop comprises a box body, wherein the box body is of a horizontal cuboid structure, the box body comprises an air inlet chamber, a purification chamber and an exhaust chamber which are sequentially communicated along the long axis direction, the air inlet chamber is provided with an air inlet pipe, and the exhaust chamber is provided with an exhaust pipe;
a plurality of liquid inlet pipes are arranged at the top part in the purifying chamber, and a plurality of spray heads are distributed on the liquid inlet pipes;
the bottom of the purification chamber is open, the purification chamber further comprises a liquid collecting tank, a circle of mounting plate is arranged on the outer wall of the open end at the top of the liquid collecting tank along the circumferential direction, a plurality of through holes are formed in the mounting plate, and the liquid collecting tank is in threaded detachable connection with the open at the bottom of the purification chamber through a first sealing bolt penetrating through the through holes; a plurality of mounting platforms are convexly arranged on a bottom plate in the liquid collecting tank, threaded holes are formed in the end portions of the mounting platforms, a plurality of filler columns are mounted at the bottom in the liquid collecting tank, the axial direction of the filler columns is perpendicular to the long axis direction of the box body, one axial end of each filler column is provided with a threaded rod matched with the threaded hole, and the linear distance between the end surface of the free end far away from the liquid collecting tank and the plane where the spray head is located right above the filler column is 1/12 smaller than the height of the box; the filling columns are arranged in a staggered manner in the direction along the long axis of the box body and in the direction along the short axis of the box body; two ends of the box body in the long axis direction are respectively provided with two hydraulic jacking rods, the bottom end of the liquid collecting tank is provided with a travelling wheel, and the length of the hydraulic jacking rods when the hydraulic jacking rods are contracted to the shortest length is smaller than the whole height from the bottom ends of the travelling wheels to the top end of the liquid collecting tank in the vertical direction.
The working principle of the invention is as follows: waste gas enters the gas inlet chamber from the gas inlet pipe for gas equalization, then enters the purification chamber for purification, finally the purified gas enters the gas outlet chamber and is discharged through the gas outlet pipe, and the gas flows in the box body along the long axis direction of the box body and is vertical to the flowing direction of the filler column and the liquid; a plurality of thin straight filler columns are arranged in the purifying chamber in a staggered manner, so that the contact area with the waste gas is greatly increased; introducing alkali liquor into a liquid inlet pipe, spraying the alkali liquor to each packing column through a spray head, so that spray liquor is adsorbed on the surface of the packing column or permeates into the packing column in the process of flowing down along the packing column, and waste gas passing through the packing column reacts with the alkali liquor adsorbed on the surface of the packing column to obtain purification treatment, or part of gas reacts with the alkali liquor in the packing column in the process of penetrating through the packing column; in addition, the packing columns are arranged in a staggered mode, and the direction of the air flow is perpendicular to the direction of the liquid flow, so that the direction of the air flow can be well changed, the retention time of waste gas in a purifying chamber can be prolonged, and the purifying efficiency can be improved; part of the spray is directly sprayed into the pores between every two adjacent filler columns, so that acid mist in the waste gas can be directly adsorbed by the alkaline spray and flows into the liquid collecting tank; the invention provides a novel horizontal filler waste gas spraying device which is small in size and suitable for carrying out primary treatment operation on waste gas in a pharmaceutical production workshop. In addition, with the collecting tank with the removable sealing connection of the bottom opening end of clean room, and with the post screw thread demountable connection that packs install on the collecting tank, be convenient for like this realize to the collecting tank and pack the holistic demountable installation of post and clean room, be convenient for change, maintenance and washing operation. The travelling wheels are arranged at the outer bottom of the liquid collecting tank, so that the whole spraying device is supported and moved, the placement position of the waste gas treatment device is convenient to move according to the use requirement in a production workshop, and after the waste gas treatment device is moved to a specified position, the hydraulic lifting rod is controlled to extend to jack the box body and the liquid collecting tank until the travelling wheels are separated from the ground; the collecting tank is convenient to detach at the moment, and the detached collecting tank can slide through the walking wheels to facilitate carrying operation of workers.
Preferably, the side wall of the liquid collecting tank is convexly provided with a mounting block, and the mounting block is provided with a clamping groove; the walking wheel is installed on the U-shaped clamping groove and further comprises a connecting rod, one axial end of the connecting rod is connected with the U-shaped clamping groove, and the other axial end of the connecting rod is embedded into the clamping groove and fixed through a bolt.
The detachable installation of the walking wheels on the liquid collecting tank is realized through the installation block, the U-shaped clamping groove, the connecting rod and the bolt.
Preferably, the axial bottom end of the hydraulic jacking rod is sleeved with a rubber pad support.
The rubber pad support mainly plays buffering, stabilizing effect.
Preferably, the packed column adopts a cylindrical structure or a conical column structure.
Especially, when a conical cylinder structure is adopted, the side wall of the axial lower section of the packed column can be fully exposed in alkali liquor spray, so that the alkali liquor spray can be fully adsorbed and permeated into the packed column.
Preferably, when the packed column adopts a conical column structure, the ratio of the outer diameter of the bottom of the conical column to the outer diameter of the top of the conical column is 2.
The bottom external diameter of circular cone post is then the effect is not obvious with the undersize of top external diameter ratio, if the ratio is too big, then the clearance of axial top section between the adjacent filled column is too big, is unfavorable for the effective purification of waste gas.
Preferably, the filled column comprises a hollow netted column body, and the inside of the netted column body is filled with a waterproof honeycomb activated carbon filling material and polyethylene filling material mixture.
The strong adsorption performance of the waterproof honeycomb activated carbon can fully adsorb alkali liquor spray and acidic waste gas, so that the alkali liquor spray and the acidic waste gas can fully react on the surface and the inside of the packed column.
Preferably, the axial bottom end of the packed column is submerged below the level of liquid stored in the sump.
After the axial bottom end of the filler column is immersed in the liquid collecting tank, a good liquid sealing effect can be formed at the bottom end of the purifying chamber, so that the problem that unpurified waste gas directly enters the exhaust chamber is solved.
The invention has the following advantages and beneficial effects:
1. the working principle of the invention is as follows: waste gas enters the gas inlet chamber from the gas inlet pipe for gas equalization, then enters the purification chamber for purification, finally the purified gas enters the gas outlet chamber and is discharged through the gas outlet pipe, and the gas flows in the box body along the long axis direction of the box body and is vertical to the flowing direction of the filler column and the liquid; a plurality of thin straight filler columns are arranged in the purifying chamber in a staggered manner, so that the contact area with the waste gas is greatly increased; introducing alkali liquor into a liquid inlet pipe, spraying the alkali liquor to each packing column through a spray head, so that spray liquor is adsorbed on the surface of the packing column or permeates into the packing column in the process of flowing down along the packing column, and waste gas passing through the packing column reacts with the alkali liquor adsorbed on the surface of the packing column to obtain purification treatment, or part of gas reacts with the alkali liquor in the packing column in the process of penetrating through the packing column; in addition, the packing columns are arranged in a staggered mode, and the direction of the air flow is perpendicular to the direction of the liquid flow, so that the direction of the air flow can be well changed, the retention time of waste gas in a purifying chamber can be prolonged, and the purifying efficiency can be improved; part of the spray is directly sprayed into the pores between every two adjacent filler columns, so that acid mist in the waste gas can be directly adsorbed by the alkaline spray and flows into the liquid collecting tank; the invention provides a novel horizontal filler waste gas spraying device which is small in size and suitable for carrying out primary treatment operation on waste gas in a pharmaceutical production workshop. In addition, with the collecting tank with the removable sealing connection of the bottom opening end of clean room, and with the post screw thread demountable connection that packs install on the collecting tank, be convenient for like this realize to the collecting tank and pack the holistic demountable installation of post and clean room, be convenient for change, maintenance and washing operation. The travelling wheels are arranged at the outer bottom of the liquid collecting tank, so that the whole spraying device is supported and moved, the placement position of the waste gas treatment device is convenient to move according to the use requirement in a production workshop, and after the waste gas treatment device is moved to a specified position, the hydraulic lifting rod is controlled to extend to jack the box body and the liquid collecting tank until the travelling wheels are separated from the ground; the collecting tank is convenient to detach at the moment, and the detached collecting tank can slide through the walking wheels to facilitate carrying operation of workers.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the cross section of the present invention in elevation;
FIG. 2 is a schematic top view of the packing column distribution of the present invention;
FIG. 3 is a schematic view of a sump testing configuration of the present invention.
Reference numbers and corresponding part names in the drawings: 1-box body, 2-air inlet chamber, 3-purifying chamber, 4-air outlet chamber, 5-air inlet pipe, 6-air outlet pipe, 7-liquid inlet pipe, 8-spray head, 9-liquid collecting tank, 10-packing column, 12-mounting plate, 13-first sealing bolt, 14-mounting table, 15-threaded hole, 16-threaded rod, 17-hydraulic jacking rod, 18-travelling wheel, 19-mounting block, 20-clamping groove, 21-U-shaped clamping groove, 22-connecting rod and 23-rubber pad support.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The tail gas recovery equipment for the pharmaceutical workshop comprises a box body 1, wherein the box body 1 is of a horizontal cuboid structure, an air inlet chamber 2, a purification chamber 3 and an exhaust chamber 4 which are sequentially communicated are arranged in the box body 1 along the long axis direction, an air inlet pipe 5 is arranged on the air inlet chamber 2, and an exhaust pipe 6 is arranged on the exhaust chamber 4;
a plurality of liquid inlet pipes 7 are arranged at the top in the purifying chamber 3, and a plurality of spray heads 8 are distributed on the liquid inlet pipes 7;
the bottom of the purification chamber 3 is open, the purification chamber further comprises a liquid collecting tank 9, a circle of mounting plate 12 is arranged on the outer wall of the open end at the top of the liquid collecting tank 9 along the circumferential direction, a plurality of through holes are formed in the mounting plate 12, and the liquid collecting tank 9 is in threaded detachable connection with the open at the bottom of the purification chamber 3 through a first sealing bolt 13 penetrating through the through holes; a plurality of mounting platforms 14 are convexly arranged on a bottom plate in the liquid collecting groove 9, threaded holes 15 are formed in the end portions of the mounting platforms 14, a plurality of filler columns 10 are mounted at the bottom in the liquid collecting groove 9, the axial direction of the filler columns 10 is perpendicular to the long axis direction of the box body 1, a threaded rod 16 matched with the threaded holes 15 is arranged at one axial end of each filler column 10, and the linear distance between the end face of the free end far away from the liquid collecting groove 9 and the plane where the spray head 8 is located right above is 1/12 smaller than the height of the box body 1; the packing columns 10 are arranged in a staggered mode in the direction along the long axis of the box body 1 and in the direction along the short axis of the box body 1; two ends of the box body 1 in the long axis direction are respectively provided with two hydraulic jacking rods 17, the bottom end of the liquid collecting tank 9 is provided with traveling wheels 18, and the length of the hydraulic jacking rods 17 when the hydraulic jacking rods are contracted to the shortest is smaller than the whole height from the bottom ends of the traveling wheels 18 to the top end of the liquid collecting tank 9 in the vertical direction.
Example 2
The improvement is further improved on the basis of the embodiment 1, the side wall of the liquid collecting tank 9 is convexly provided with a mounting block 19, and the mounting block 19 is provided with a clamping groove 20; the walking wheels 18 are mounted on the U-shaped clamping grooves 21 and further comprise connecting rods 22, one axial ends of the connecting rods 22 are connected with the U-shaped clamping grooves 21, and the other axial ends of the connecting rods 22 are embedded into the clamping grooves 20 and fixed through bolts. The axial bottom end of the hydraulic jacking rod 17 is sleeved with a rubber pad support 23.
Example 3
The improvement is further improved on the basis of the embodiment 2, and the packing column 10 adopts a cylindrical structure or a conical column structure. When the packed column 10 adopts a conical column structure, the ratio of the outer diameter of the bottom of the conical column to the outer diameter of the top of the conical column is 2. The packed column 10 includes a hollow mesh column body, and the inside of the mesh column body is filled with a mixture of waterproof honeycomb activated carbon packing and polyethylene packing.
Example 4
In a further improvement on example 3, the axial bottom end of the packing column 10 is submerged below the level of the liquid stored in the sump 9.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The tail gas recovery equipment for the pharmaceutical workshop is characterized by comprising a box body (1), wherein the box body (1) is of a horizontal cuboid structure, an air inlet chamber (2), a purification chamber (3) and an exhaust chamber (4) which are sequentially communicated are arranged in the box body (1) along the long axis direction, an air inlet pipe (5) is arranged on the air inlet chamber (2), and an exhaust pipe (6) is arranged on the exhaust chamber (4);
a plurality of liquid inlet pipes (7) are arranged at the top in the purifying chamber (3), and a plurality of spray heads (8) are distributed on the liquid inlet pipes (7);
the bottom of the purification chamber (3) is open, the purification chamber further comprises a liquid collecting tank (9), a circle of mounting plate (12) is arranged on the outer wall of the open end at the top of the liquid collecting tank (9) along the circumferential direction, a plurality of through holes are formed in the mounting plate (12), and the liquid collecting tank (9) is in threaded detachable connection with the open at the bottom of the purification chamber (3) through a first sealing bolt (13) penetrating through the through holes; a bottom plate in the liquid collecting tank (9) is convexly provided with a plurality of mounting tables (14), the end parts of the mounting tables (14) are provided with threaded holes (15), a plurality of packing columns (10) are mounted at the bottom in the liquid collecting tank (9), the axial direction of the packing columns (10) is vertical to the long axis direction of the box body (1), one axial end of each packing column (10) is provided with a threaded rod (16) matched with the threaded hole (15), and the linear distance between the end surface of the free end far away from the liquid collecting tank (9) and the plane where the spray head (8) is located right above is 1/12 which is smaller than the height of the box body (1); the packing columns (10) are arranged in a staggered manner in the direction along the long axis of the box body (1) and in the direction along the short axis of the box body (1); two ends of the box body (1) in the long axis direction are respectively provided with two hydraulic jacking rods (17), the bottom end of the liquid collecting tank (9) is provided with traveling wheels (18), and the length of the hydraulic jacking rods (17) when the hydraulic jacking rods are contracted to the shortest is smaller than the integral height from the bottom ends of the traveling wheels (18) to the top end of the liquid collecting tank (9) in the vertical direction.
2. The tail gas recovery device for the pharmaceutical workshop according to claim 1, wherein a mounting block (19) is convexly arranged on the side wall of the liquid collecting tank (9), and a clamping groove (20) is formed in the mounting block (19); the walking wheels (18) are mounted on the U-shaped clamping grooves (21) and further comprise connecting rods (22), one axial end of each connecting rod (22) is connected with the U-shaped clamping groove (21), and the other axial end of each connecting rod is embedded into the clamping groove (20) and fixed through bolts.
3. The pharmaceutical workshop tail gas recovery device according to claim 1, wherein the axial bottom end of the hydraulic lifting rod (17) is sleeved with a rubber pad support (23).
4. The pharmaceutical workshop exhaust gas recovery device according to claim 1, wherein the packed column (10) has a cylindrical structure or a conical column structure.
5. The pharmaceutical workshop exhaust gas recovery device according to claim 4, wherein the ratio of the bottom outer diameter to the top outer diameter of the conical column is 2 when the packed column (10) is in a conical column structure.
6. The pharmaceutical workshop tail gas recovery device according to claim 1, wherein the packed column (10) comprises a hollow mesh column filled with a mixture of waterproof honeycomb activated carbon filler and polyethylene filler.
7. Pharmaceutical workshop exhaust gas recovery device according to claim 1, characterized in that the axial bottom end of the packed column (10) is submerged below the level of the liquid stored in the sump (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810214358.2A CN108310949B (en) | 2018-03-15 | 2018-03-15 | Tail gas recovery equipment for pharmaceutical workshop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810214358.2A CN108310949B (en) | 2018-03-15 | 2018-03-15 | Tail gas recovery equipment for pharmaceutical workshop |
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| Publication Number | Publication Date |
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| CN108310949A CN108310949A (en) | 2018-07-24 |
| CN108310949B true CN108310949B (en) | 2021-01-12 |
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| CN201810214358.2A Active CN108310949B (en) | 2018-03-15 | 2018-03-15 | Tail gas recovery equipment for pharmaceutical workshop |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE738938A (en) * | 1969-09-16 | 1970-03-02 | Stacked grids for cooling towers | |
| CH706125B1 (en) * | 2013-01-11 | 2013-08-30 | Techeffekt Anstalt | Transformation- and storage block, particularly enthalpy transformation- and storage block, has multiple channels, where channel walls consist of sorptive functional layer, which is permanent casing for storage material |
| CN104607136B (en) * | 2013-11-05 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of spindle structured packing |
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