CN111803989A - Trichloroethylene rectifying tower - Google Patents
Trichloroethylene rectifying tower Download PDFInfo
- Publication number
- CN111803989A CN111803989A CN202010760096.7A CN202010760096A CN111803989A CN 111803989 A CN111803989 A CN 111803989A CN 202010760096 A CN202010760096 A CN 202010760096A CN 111803989 A CN111803989 A CN 111803989A
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- China
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- pipe
- trichloroethylene
- rectifying tower
- spraying
- wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
- C07C17/383—Separation; Purification; Stabilisation; Use of additives by distillation
Abstract
The invention discloses a trichloroethylene rectifying tower, which comprises a rectifying tower body and a plurality of manholes arranged on the rectifying tower body, the rectifying tower body is internally provided with a spraying passivation device for preventing the inner wall of the rectifying tower body from reacting with oxygen in trichloroethylene, the spray passivation device comprises a supporting plate which is arranged between two fillers and is positioned at the bottom end of the top filler, the spray passivation device is arranged on the inner wall of the rectifying tower body, namely the outer side of the filler layer, the spraying passivation device can be used for spraying passivation coating on the inner wall of the steel rectifying tower before the trichloroethylene reaction is carried out in the rectifying tower body, or after the rectifying tower body is used for a certain number of times, the inner wall of the rectifying tower body can be sprayed, so that the inner wall of the steel rectifying tower body is in a passivated state, and the smoothness of the inner wall is kept at the same time, thereby preventing the oxygen from reacting with the inner wall of the rectifying tower, improving the preparation efficiency of the hydrogen trichloride and preventing impurities such as black spots and the like from being contained in the preparation of the trichloroethylene.
Description
Technical Field
The invention relates to the technical field of rectifying towers, in particular to a trichloroethylene rectifying tower.
Background
The rectifying tower is a tower-type gas-liquid contact device for rectifying. By utilizing the property that each component in the mixture has different volatility, namely the vapor pressure of each component is different at the same temperature, the light component (low-boiling-point substance) in the liquid phase is transferred into the gas phase, and the heavy component (high-boiling-point substance) in the gas phase is transferred into the liquid phase, thereby realizing the purpose of separation. The rectifying tower is also a mass and heat transfer device which is widely applied in petrochemical production;
at present, the temperature control range inside a rectifying tower used for producing the conventional trichloroethylene is 32-34 ℃, so a rectifying low-boiling tower is used for rectifying, however, in the rectifying process, crude trichloroethylene introduced along the inside of the rectifying tower often contains hydrogen chloride and a small amount of oxygen, and the rectifying tower is made of steel equipment, so that trace oxygen and corrosion of the inner wall of the tower are easily caused, iron ions are produced, and due to the existence of monomer iron ions, impurities such as black spots exist in the production process of the trichloroethylene, and the uniformity and the preparation precision of the hydrogen trichloride are further influenced. Therefore, a trichloroethylene rectifying tower is provided.
Disclosure of Invention
The invention aims to provide a trichloroethylene rectifying tower to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: trichloroethylene rectifying column, including rectifying column body and a plurality of manhole of setting on the rectifying column body, rectifying column body inside is equipped with the spraying passivating device who prevents its inner wall and trichloroethylene in the oxygen reaction.
Preferably, the spraying passivation device is provided with a plurality of, and a plurality of spraying passivation device distributes respectively between two packings, through a plurality of spraying passivation device that is equipped with to play and carry out the effect of even spraying passivation to rectifying column body inner wall.
Preferably, the spraying passivating device is including setting up the backup pad that just is located the top and packs the bottom between two fillers, the backup pad bottom is equipped with the driving piece, and driving piece output fixedly connected with link, link outside fixedly connected with spray tube, the spray tube outside just is close to rectifying column body inner wall and is equipped with the shower nozzle, the spray tube top is equipped with the protection piece, and the spray tube bottom is equipped with and connects the material piece, the spray tube outside just is located and is equipped with the feeding piece on the link, through the spraying passivating device who is equipped with to the realization carries out the effect of even spraying tectorial membrane to the inner wall of rectifying column body.
Preferably, the driving piece includes the driving motor of fixed connection in the backup pad bottom, driving motor output fixedly connected with threaded rod, the locating rack has been cup jointed through the bearing rotation in the threaded rod outside, and locating rack top and backup pad fixed connection, the locating rack bottom just is located two slide bars of threaded rod outside fixedly connected with, two the adapter sleeve has been cup jointed in the slide bar outside rotation, the inside internal thread that is equipped with of adapter sleeve, and the adapter sleeve rotate and cup joint in the threaded rod outside, link fixed connection is in the adapter sleeve outside, through the driving piece that is equipped with to the realization carries out driven effect to the adapter sleeve.
Preferably, the spray heads are uniformly distributed on one side, close to the inner wall of the rectifying tower body, of the spraying pipe, and the plurality of spray heads are arranged, so that the effect of uniformly spraying the inner wall of the rectifying tower body is achieved.
Preferably, the protection piece is including setting up the solid fixed ring in top filler bottom, and solid fixed ring and rectifying column body inner wall fixed connection, the sealed telescope tube of fixed ring bottom end fixed connection, and sealed telescope tube bottom end fixed connection is on the spraying pipe, through the protection piece that is equipped with to play and carry out the effect that sprays passivation laminating agent and prevent splashing to rectifying column body inside.
Preferably, connect the material piece to include that fixed connection connects the material shell in the annular of spraying pipe bottom, and the annular connects the material shell outside to be connected with the cooperation of rectifying column body inner wall, the annular connects the inside annular of being equipped with of material shell to connect the silo, the annular connects the inside bottom intercommunication of silo to have first connecting pipe, the one end intercommunication that connects the silo was kept away from to first connecting pipe has first booster pump, first booster pump output intercommunication has the second connecting pipe, the one end and the spraying pipe intercommunication of second connecting pipe, through the material piece that connects that is equipped with to play and connect the effect of material to the passivation laminating machine of spraying.
Preferably, the feed spare is including setting up the recess on the link, and the inside slip of recess runs through there is the storage vat, two fixture blocks of storage vat outside fixedly connected with, two the fixture block joint is on the link, the outside that the link corresponds the recess is equipped with two draw-in grooves, be equipped with the internal thread pipe on the storage vat, and the inside threaded connection of internal thread pipe has external screw pipe, the intercommunication has first feeding pipe on the external screw pipe, be equipped with the solenoid valve on the first feeding pipe, and the one end intercommunication that external screw pipe was kept away from to first feeding pipe has the second booster pump, second booster pump output intercommunication has the second feeding pipe, and the one end and the spraying pipe intercommunication of second feeding pipe, second booster pump fixed connection is on the link, through the feed spare that is equipped with to play and carry out the effect of feed to the spraying pipe.
Preferably, the first feeding pipe outside is fixed to be cup jointed with spacing, and spacing fixed connection is on the link, through the locating part that is equipped with to play and carry out the effect that stabilizes the support to the one end of first feeding pipe.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the spraying passivation device is arranged on the inner wall of the rectifying tower body, namely the outer side of the packing layer, and can be used for spraying passivation coating on the inner wall of the steel rectifying tower before trichloroethylene reaction is carried out in the rectifying tower body, or spraying the inner wall of the rectifying tower body after the rectifying tower body is used for a certain number of times, so that the inner wall of the steel rectifying tower body is in a passivation state, the smoothness of the inner wall is kept, the reaction of oxygen and the inner wall of the rectifying tower is further prevented, the preparation efficiency of hydrogen trichloride is improved, and impurities such as black spots are prevented from being contained in the preparation of trichloroethylene.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a spray passivation apparatus according to the present invention;
FIG. 3 is a schematic view of a support plate according to the present invention;
FIG. 4 is an enlarged view of area A of FIG. 2 according to the present invention;
FIG. 5 is an enlarged view of area B of FIG. 3 in accordance with the present invention;
FIG. 6 is an enlarged view of the area C in FIG. 3 according to the present invention.
In the figure: 1-rectifying column body; 2-a manhole; 3-spraying a passivation device; 4-a support plate; 5-a driving member; 6-a connecting frame; 7-spraying a pipe; 8-a spray head; 9-receiving the material; 10-a feeding member; 11-a drive motor; 12-a threaded rod; 13-a positioning frame; 14-a slide bar; 15-connecting sleeves; 16-a guard; 17-a fixing ring; 18-sealing the telescopic sleeve; 19-annular material receiving shell; 20-an annular receiving trough; 21-a first connection pipe; 22-a first booster pump; 23-a second connecting tube; 24-a groove; 25-a storage barrel; 26-a fixture block; 27-a card slot; 28-an internally threaded tube; 29-external threaded pipe; 30-a first feed pipe; 31-a solenoid valve; 32-a second booster pump; 33-a second feed pipe; 34-a limiting frame.
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.
Referring to fig. 1-6, the present invention provides a technical solution: the trichloroethylene rectifying tower comprises a rectifying tower body 1 and a plurality of manholes 2 arranged on the rectifying tower body 1, the manholes 2 are convenient for the manholes 2 to perform regular detection on the interior of the rectifying tower body 1, a spraying passivation device 3 for preventing the inner wall of the rectifying tower body 1 from reacting with oxygen in trichloroethylene is arranged in the rectifying tower body 1, the spraying passivation devices 3 are provided with a plurality of spraying passivation devices 3, and the plurality of spraying passivation devices 3 are respectively distributed between two fillers;
the spraying passivation device 3 comprises a supporting plate 4 which is arranged between two fillers and is positioned at the bottom end of the top filler, a driving piece 5 is arranged at the bottom end of the supporting plate 4, a connecting frame 6 is fixedly connected with the output end of the driving piece 5, a spraying pipe 7 is fixedly connected with the outer side of the connecting frame 6, the spraying pipe 7 is in a ring shape, a plurality of spray heads 8 are arranged at the outer side of the spraying pipe 7 and are close to the inner wall of the rectifying tower, a plurality of spray heads 8 are uniformly distributed at one side of the spraying pipe 7 close to the inner wall of the rectifying tower body 1, the driving piece 5 comprises a driving motor 11 fixedly connected with the bottom end of the supporting plate 4, in addition, a waterproof sleeve can be arranged at the outer side of the driving motor 11, the effect of protecting the driving motor 11 is realized, the stable operation of the driving motor 11 is ensured, a threaded rod 12 is fixedly connected with, the positioning frame 13 is U-shaped, so that the threaded rod 12 is stably supported, the top end of the positioning frame 13 is fixedly connected with the supporting plate 4, two sliding rods 14 are fixedly connected to the bottom end of the positioning frame 13 and positioned outside the threaded rod 12, a connecting sleeve 15 is rotatably sleeved outside the two sliding rods 14, internal threads are arranged inside the connecting sleeve 15, the connecting sleeve 15 is rotatably sleeved outside the threaded rod 12, and the connecting frame 6 is fixedly connected to the outside of the connecting sleeve 15;
the driving motor 11 operates to enable the threaded rod 12 to rotate, the threaded rod 12 provides driving force for the connecting sleeve 15 while rotating, and the connecting sleeve 15 moves relatively along the threaded rod 12 under the limiting action of the two sliding rods 14, so that the connecting frame 6 is further driven to move synchronously;
the top end of the spraying pipe 7 is provided with a protection part 16, the protection part 16 comprises a fixing ring 17 arranged at the bottom end of a top filler, the fixing ring 17 is fixedly connected with the inner wall of the rectifying tower body 1, the bottom end of the fixing ring 17 is fixedly connected with a sealed telescopic sleeve 18, the telescopic sleeve has a telescopic function, the telescopic sleeve and the fixing ring 17 and the spraying pipe 7 form a relatively sealed state respectively, the telescopic sleeve plays a role in preventing the passivation coating agent from splashing, and the bottom end of the sealed telescopic sleeve 18 is fixedly connected to the spraying pipe 7;
the bottom end of the spraying pipe 7 is provided with a material receiving part 9, the material receiving part 9 comprises an annular material receiving shell 19 fixedly connected to the bottom end of the spraying pipe 7, the outer side of the annular material receiving shell 19 is connected with the inner wall of the rectifying tower body 1 in a matched mode, an annular material receiving groove 20 is arranged inside the annular material receiving shell 19, the bottom end inside the annular material receiving groove 20 is communicated with a first connecting pipe 21, one end, far away from the material receiving groove, of the first connecting pipe 21 is communicated with a first booster pump 22, the output end of the first booster pump 22 is communicated with a second connecting pipe 23, one end of the second connecting pipe 23 is communicated with the spraying pipe 7, two sides inside the annular material receiving groove 20 are in a wedge shape, and the function of conducting drainage on the sprayed passivation coating agent is;
the feeding part 10 is arranged on the connecting frame 6 and outside the spraying pipe 7, the feeding part 10 comprises a groove 24 formed in the connecting frame 6, a storage barrel 25 penetrates through the groove 24 in a sliding manner, two clamping blocks 26 are fixedly connected to the outer side of the storage barrel 25, the two clamping blocks 26 are clamped on the connecting frame 6, two clamping grooves 27 are formed in the connecting frame 6 and correspond to the groove 24, the two clamping blocks 26 are smaller than or equal to the two clamping grooves 27 in shape and size, the storage barrel 25 can be clamped on the groove 24 through the two clamping blocks 26, and the clamping blocks 26 and the clamping grooves 27 correspond to each other by rotating the storage barrel 25, so that the storage barrel 25 can be separated quickly, and the storage barrel 25 can be replaced conveniently;
the storage barrel 25 is provided with an internal threaded pipe 28, the internal threaded pipe 28 is connected with an external threaded pipe 29 in a threaded manner, and is connected with the external threaded pipe 29 through the internal threaded pipe 28, thereby facilitating the replacement of the storage vat 25 through the manhole 2, the external thread pipe 29 is communicated with a first feeding pipe 30, the first feeding pipe 30 is provided with an electromagnetic valve 31, and one end of the first feeding pipe 30, which is far away from the external threaded pipe 29, is communicated with a second booster pump 32, the output end of the second booster pump 32 is communicated with a second feeding pipe 33, one end of a second feeding pipe 33 is communicated with the spraying pipe 7, the second booster pump 32 is fixedly connected on the connecting frame 6, the outer side of the first feeding pipe 30 is fixedly sleeved with a limiting frame 34, and the limiting frame 34 is fixedly connected to the connecting frame 6, and the limiting frame 34 is in a U shape, so as to play a role in stably supporting the first feeding pipe 30.
The specific implementation process comprises the following steps: when coarse trichloroethylene is rectified, firstly, the motor 11 is driven to operate, meanwhile, the electromagnetic valve 31 is opened, the second booster pump 32 is enabled to boost the storage barrel 25, the passivation film coating agent in the storage barrel 25 is led into the spraying pipe 7 through the first feeding pipe 30 and the second feeding pipe 33, the passivation film coating agent is uniformly sprayed to the outer wall of the outer side of the filler corresponding to the rectifying tower body 1 through the plurality of nozzles 8 of the spraying pipe 7, meanwhile, the telescopic sleeve has the function of preventing splashing, the annular receiving groove 20 has the function of collecting the passivation film coating agent, the passivation film coating agent is further fully used and sprayed, the effect of fully coating the rectifying tower body 1 is achieved, and the trichloroethylene is convenient to react, in the application, because the inner wall of the passivated rectifying tower body 1 is consumed in each trichloroethylene reaction, the consumption can be determined, the inner wall of the rectifying tower body 1 is regularly sprayed, and the service life of the rectifying tower body 1 is further prolonged.
In the scheme, the type Y80M1-2 is preferably selected as the driving motor 11, the type YF-2811 is preferably selected as the electromagnetic valve 31, the circuit operates as the conventional circuit, the circuits and the control related to the invention are the prior art, and redundant description is not repeated herein.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. Trichloroethylene rectifying column, including rectifying column body (1) and a plurality of manhole (2) of setting on rectifying column body (1), its characterized in that: and a spraying passivation device (3) for preventing the inner wall of the rectifying tower body (1) from reacting with oxygen in trichloroethylene is arranged in the rectifying tower body.
2. The trichloroethylene rectification column of claim 1, wherein: the spraying passivation devices (3) are provided with a plurality of spraying passivation devices, and the spraying passivation devices (3) are respectively distributed between the two fillers.
3. The trichloroethylene rectification column as claimed in claim 2, wherein: spraying passivating device (3) is including setting up backup pad (4) that just is located top filler bottom between two fillers, backup pad (4) bottom is equipped with driving piece (5), and driving piece (5) output end fixedly connected with link (6), link (6) outside fixedly connected with spray tube (7), the spray tube (7) outside and be close to rectifying column body (1) inner wall and be equipped with shower nozzle (8), spray tube (7) top is equipped with protection piece (16), and spray tube (7) bottom is equipped with material receiving member (9), the spray tube (7) outside just is located and is equipped with on link (6) and gives material member (10).
4. The trichloroethylene rectification column as claimed in claim 3, wherein: driving piece (5) are including driving motor (11) of fixed connection in backup pad (4) bottom, driving motor (11) output end fixedly connected with threaded rod (12), locating rack (13) have been cup jointed in the threaded rod (12) outside through the bearing rotation, and locating rack (13) top and backup pad (4) fixed connection, locating rack (13) bottom just is located two slide bars (14), two of threaded rod (12) outside fixedly connected with, slide bar (14) outside is rotated and is cup jointed adapter sleeve (15), adapter sleeve (15) inside is equipped with the internal thread, and adapter sleeve (15) rotate and cup joint in the threaded rod (12) outside, adapter sleeve (6) fixed connection is in adapter sleeve (15) outside.
5. The trichloroethylene rectification column as claimed in claim 3, wherein: the spray head (8) is provided with a plurality of spray heads (8), and the plurality of spray heads (8) are uniformly distributed on one side of the spray pipe (7) close to the inner wall of the rectifying tower body (1).
6. The trichloroethylene rectification column as claimed in claim 3, wherein: the protection piece (16) is including setting up solid fixed ring (17) in top packing bottom, and solid fixed ring (17) and rectifying column body (1) inner wall fixed connection, gu fixed ring (17) bottom fixed connection has sealed telescope tube (18), and sealed telescope tube (18) bottom fixed connection is on spraying pipe (7).
7. The trichloroethylene rectification column as claimed in claim 3, wherein: connect material piece (9) to connect material shell (19) including the annular of fixed connection in coating pipe (7) bottom, and the annular connects material shell (19) outside and rectifying column body (1) inner wall cooperation to be connected, the annular connects material shell (19) inside to be equipped with the annular and connects silo (20), the annular connects the inside bottom intercommunication of silo (20) to have first connecting pipe (21), the one end intercommunication of connecting the silo is kept away from in first connecting pipe (21) has first booster pump (22), first booster pump (22) output intercommunication has second connecting pipe (23), the one end and the coating pipe (7) intercommunication of second connecting pipe (23).
8. The trichloroethylene rectification column as claimed in claim 3, wherein: the feeding part (10) comprises a groove (24) arranged on a connecting frame (6), the groove (24) is internally slid to penetrate through a storage barrel (25), two clamping blocks (26) are fixedly connected to the outer side of the storage barrel (25) and are connected to the connecting frame (6), two clamping grooves (27) are formed in the outer side of the connecting frame (6) corresponding to the groove (24), an internal thread pipe (28) is arranged on the storage barrel (25), an external thread pipe (29) is connected to the internal thread pipe (28) in a threaded manner, a first feeding pipe (30) is communicated to the external thread pipe (29), an electromagnetic valve (31) is arranged on the first feeding pipe (30), a second booster pump (32) is communicated to one end, far away from the external thread pipe (29), of the first feeding pipe (30), and a second feeding pipe (33) is communicated to the output end of the second booster pump (32), and one end of the second feeding pipe (33) is communicated with the spraying pipe (7), and the second booster pump (32) is fixedly connected to the connecting frame (6).
9. The trichloroethylene rectification column of claim 8 wherein: the outer side of the first feeding pipe (30) is fixedly sleeved with a limiting frame (34), and the limiting frame (34) is fixedly connected to the connecting frame (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010760096.7A CN111803989A (en) | 2020-07-31 | 2020-07-31 | Trichloroethylene rectifying tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010760096.7A CN111803989A (en) | 2020-07-31 | 2020-07-31 | Trichloroethylene rectifying tower |
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| Publication Number | Publication Date |
|---|---|
| CN111803989A true CN111803989A (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010760096.7A Pending CN111803989A (en) | 2020-07-31 | 2020-07-31 | Trichloroethylene rectifying tower |
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| CN (1) | CN111803989A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103861309A (en) * | 2012-12-18 | 2014-06-18 | 天津大港鹏瀚石油化工有限公司 | Novel anti-corrosion rectifying kettle |
| CN206444218U (en) * | 2017-01-09 | 2017-08-29 | 安徽临涣化工有限责任公司 | A kind of high Multistage rectifying tower of thermal efficiency |
| CN110394261A (en) * | 2019-08-02 | 2019-11-01 | 陆秀权 | A kind of spray equipment for the processing of hydrostatic column inwall processing |
| CN209918177U (en) * | 2019-04-23 | 2020-01-10 | 盐城华夏高空建筑防腐维修有限公司 | Anticorrosive spraying device of chimney |
| CN210700794U (en) * | 2019-09-10 | 2020-06-09 | 濮阳市顺康石油工程技术有限公司 | Auxiliary device for spraying anticorrosive material on inner coating of oil pipe |
| CN210753387U (en) * | 2019-09-09 | 2020-06-16 | 河南省防腐保温开发有限公司 | Anticorrosive high-efficient spraying device of chemical plant chimney |
-
2020
- 2020-07-31 CN CN202010760096.7A patent/CN111803989A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103861309A (en) * | 2012-12-18 | 2014-06-18 | 天津大港鹏瀚石油化工有限公司 | Novel anti-corrosion rectifying kettle |
| CN206444218U (en) * | 2017-01-09 | 2017-08-29 | 安徽临涣化工有限责任公司 | A kind of high Multistage rectifying tower of thermal efficiency |
| CN209918177U (en) * | 2019-04-23 | 2020-01-10 | 盐城华夏高空建筑防腐维修有限公司 | Anticorrosive spraying device of chimney |
| CN110394261A (en) * | 2019-08-02 | 2019-11-01 | 陆秀权 | A kind of spray equipment for the processing of hydrostatic column inwall processing |
| CN210753387U (en) * | 2019-09-09 | 2020-06-16 | 河南省防腐保温开发有限公司 | Anticorrosive high-efficient spraying device of chemical plant chimney |
| CN210700794U (en) * | 2019-09-10 | 2020-06-09 | 濮阳市顺康石油工程技术有限公司 | Auxiliary device for spraying anticorrosive material on inner coating of oil pipe |
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