CN107126911A - A kind of lined compound pipe, preparation method and nozzle - Google Patents
A kind of lined compound pipe, preparation method and nozzle Download PDFInfo
- Publication number
- CN107126911A CN107126911A CN201710495330.6A CN201710495330A CN107126911A CN 107126911 A CN107126911 A CN 107126911A CN 201710495330 A CN201710495330 A CN 201710495330A CN 107126911 A CN107126911 A CN 107126911A
- Authority
- CN
- China
- Prior art keywords
- air inlet
- pipe
- going out
- branch pipe
- compound pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 150000001875 compounds Chemical class 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 24
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 24
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 65
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000004411 aluminium Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 229940067573 brown iron oxide Drugs 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012495 reaction gas Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000003026 anti-oxygenic effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1818—Feeding of the fluidising gas
- B01J8/1827—Feeding of the fluidising gas the fluidising gas being a reactant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1872—Details of the fluidised bed reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00796—Details of the reactor or of the particulate material
- B01J2208/00893—Feeding means for the reactants
- B01J2208/00902—Nozzle-type feeding elements
Abstract
The invention provides a kind of lined compound pipe, preparation method and nozzle, the lined compound pipe, including：Outer tubular wall and the lining being attached in the outer tubular wall, wherein, the outer tubular wall includes ferro element；The lining includes aluminum oxide, CNT and antioxidant.Lined compound pipe provided in an embodiment of the present invention has stronger toughness, and risk of breakage is effectively reduced in use.
Description
Technical field
The present invention relates to chemical technology field, more particularly to a kind of lined compound pipe, preparation method and nozzle.
Background technology
At present, lined steel pipe is widely used in various fields, and the fluid bed for being such as applied to heterogeneous catalytic reaction is anti-
Answer tubular gas distributor, nozzle in device etc..But, conventional lined steel pipe lining only contains aluminum oxide or pottery at present
Porcelain, and aluminum oxide or ceramics are more crisp, are easily broken when being impacted.As the nozzle in fluidized-bed reactor by
When reacting gas or catalyst impact, it is easy to be broken.
The content of the invention
The embodiments of the invention provide a kind of lined compound pipe, preparation method and nozzle, with stronger toughness, using
During effectively reduce risk of breakage.
A kind of lined compound pipe, including：Outer tubular wall and the lining being attached in the outer tubular wall, wherein,
The outer tubular wall includes ferro element；
The lining includes aluminum oxide, CNT and antioxidant.
Preferably,
The quality of the CNT is the 0.01%~0.5% of the lined compound pipe gross mass.
Preferably,
The quality of the antioxidant is the 0.01%~0.5% of the lined compound pipe gross mass.
Preferably,
The antioxidant granularity is 1 μm~15 μm.
A kind of preparation method of lined compound pipe, including：
Aluminium powder and brown iron oxide are mixed and are put into the tubular die of certain internal diameter；
And CNT and antioxidant are mixed into the aluminium powder and the brown iron oxide after mixing；
Under an inert atmosphere, the aluminium powder and the brown iron oxide after mixing are heated to molten by Resistant heating mode
Melt state, carry out thermit reaction；
Pass through the iron of molten condition and molten generated to the CNT, the antioxidant and thermit reaction
The aluminum oxide of state is centrifuged, and the iron of the molten condition forms outer tubular wall, the molten condition along the tubular die
Aluminum oxide, the CNT and antioxidant formation be attached at lining in the outer tubular wall.
A kind of nozzle using any of the above-described described lined compound pipe manufacture, including：Air inlet is responsible for and at least three go out
Gas branch pipe, wherein,
The air inlet supervisor is the lined compound pipe of the first internal diameter, and each described going out gas branch pipe is the lining of the second internal diameter
Multiple tube, wherein, first internal diameter is more than second internal diameter；
The air inlet supervisor includes the air inlet positioned at one end and at least three gas outlets on the wall of side；
Each described gas outlet connects a going out gas branch pipe, at least three going out gas branch pipe in a welding manner
Between any two angle that is formed be not mutually equal；
External reaction gas by the air inlet enter the air inlet pipe, and by the gas outlet and it is corresponding it is described go out
Gas branch pipe flows out.
Preferably,
It is 3~400mm that corresponding first internal diameter is responsible in the air inlet；Corresponding second internal diameter of the going out gas branch pipe for 2~
200mm。
Preferably,
Angle between the air inlet and the line of target gas outlet and the going out gas branch pipe of target gas outlet connection
No more than 90 degree.
Preferably,
The air inlet supervisor other end is the blind end of arcuate structure, and the arcuate structure angle is 90~180 degree.
Preferably,
The air inlet has helicitic texture, for being connected with extraneous gas distributor.
Preferably, any of the above-described described nozzle, further comprises：Fixed part, wherein,
The fixed part includes supervisor's passage and at least three branch passageways；
Supervisor's passage, for placing the air inlet supervisor, the outer wall that its inwall is responsible for the air inlet is fitted, with solid
Surely the air inlet is supported to be responsible for；
Each described branch passageway, for placing a going out gas branch pipe, its inwall and a going out gas branch pipe
Outer wall laminating, support the going out gas branch pipe with fixed.
The embodiments of the invention provide a kind of lined compound pipe, preparation method and nozzle, due to the lining in lined compound pipe
In in the CNT modulus of elasticity that includes and fracture strength it is higher, the toughness of lined compound pipe can be increased well, and resist
Oxidant can avoid CNT from being oxidized and lose original modulus of elasticity and fracture strength, therefore, the embodiment of the present invention are carried
The lined compound pipe of confession has stronger toughness, and risk of breakage is effectively reduced in use.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of flow chart of the preparation method for lined compound pipe that one embodiment of the invention is provided；
Fig. 2 is a kind of tangent plane structural representation for nozzle that one embodiment of the invention is provided；
Fig. 3 is the sectional view for the upper gas outlet distribution situation of air inlet supervisor that one embodiment of the invention is provided；
Fig. 4 is a kind of top view for nozzle that one embodiment of the invention is provided；
Fig. 5 is a kind of tangent plane structural representation for nozzle that another embodiment of the present invention is provided.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments, based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of lined compound pipe, including：Outer tubular wall and it is attached in the outer tubular wall
Lining, wherein,
The outer tubular wall includes ferro element；
The lining includes aluminum oxide, CNT and antioxidant.
, can be fine because the CNT modulus of elasticity and fracture strength that are included in the lining of lined compound pipe are higher
Ground increases the toughness of lined compound pipe, and antioxidant can avoid CNT is oxidized from losing original modulus of elasticity and disconnected
Resistance to spalling, therefore, lined compound pipe provided in an embodiment of the present invention have stronger toughness, efficiently reduce in use
Risk of breakage.
In an alternative embodiment of the invention, in order to ensure the toughness of lining, while the waste of CNT is avoided, the carbon
The quality of nanotube is the 0.01%~0.5% of the lined compound pipe gross mass.
In still another embodiment of the process, in order to avoid CNT is oxidized, the quality of the antioxidant is described
The 0.01%~0.5% of lined compound pipe gross mass.
In still another embodiment of the process, in order to ensure the antioxygenic property of antioxidant, the antioxidant granularity is 1
μm~15 μm.
As shown in figure 1, the embodiments of the invention provide a kind of preparation method of lined compound pipe, this method can include with
Lower step：
Step 101：Aluminium powder and brown iron oxide are mixed and are put into the tubular die of certain internal diameter；
Step 102：CNT and antioxidant are mixed into the aluminium powder and the brown iron oxide after mixing；
Step 103：Under an inert atmosphere, the aluminium powder and the oxidation after mixing are heated by Resistant heating mode
Iron powder carries out thermit reaction to molten condition；
Step 104：By the iron of the molten condition generated to the CNT, the antioxidant and thermit reaction
Centrifuged with the aluminum oxide of molten condition, the iron of the molten condition is described along tubular die formation outer tubular wall
The aluminum oxide of molten condition, the CNT and antioxidant formation are attached at the lining in the outer tubular wall.
The internal diameter 76mm prepared using above-mentioned preparation method lined compound pipe, its fracture toughness is pure alumina lining
5 times, with fabulous wearability.
In addition, the nozzle of the lined compound pipe manufacture of the different inner diameters prepared using above-mentioned preparation method, fracture toughness is
Lining is 5 times of the nozzle of pure alumina, with fabulous wearability.
As shown in Fig. 2 the embodiments of the invention provide a kind of spray using any of the above-described described lined compound pipe manufacture
Mouth, the nozzle can include：
Air inlet supervisor 201 and at least three going out gas branch pipe 202, wherein,
The air inlet supervisor 201 is the lined compound pipe of the first internal diameter, and each described going out gas branch pipe is the second internal diameter
Lined compound pipe, wherein, first internal diameter is more than second internal diameter；
The air inlet supervisor 201 includes the air inlet 2011 positioned at one end and at least three gas outlets on the wall of side
2012；
Each described gas outlet 2012 connects a going out gas branch pipe 202, described at least three in a welding manner
Any two angle formed between going out gas branch pipe 202 is not mutually equal；
External reaction gas enters air inlet supervisor 201 by the air inlet 2011, and passes through the gas outlet 2012
Flowed out with the corresponding going out gas branch pipe 202.
Wherein, air inlet is responsible for the distribution situation of gas outlet 2012 on 201 as shown in figure 3, from figure 3, it can be seen that gas outlet
2012 carry out uneven distribution on air inlet supervisor 201, so that what is formed between at least three going out gas branch pipe 202 is any
Two angles are not mutually equal.
In order to more clearly demonstrate between relation and each going out gas branch pipe 202 between air inlet supervisor 201 and going out gas branch pipe 202
Relation, in still another embodiment of the process, using shown in Fig. 4 air inlet supervisor connection 5 going out gas branch pipe nozzle top view as
Example, can significantly find out each going out gas branch pipe 202 connection air inlet supervisor 201, while shape between each going out gas branch pipe from figure
Into angle be not mutually equal so that ensure going out gas branch pipe outflow gas along air inlet supervisor for axle center carry out screw, from
And make gas scattered more uniform.
In an alternative embodiment of the invention, it is 3~400mm that 201 corresponding first internal diameters are responsible in the air inlet；The outlet
Corresponding second internal diameter of branch pipe 202 is 2~200mm.
In still another embodiment of the process, the air inlet 2011 and the line of target gas outlet 2012 go out with the target
Angle between the going out gas branch pipe 202 of gas port connection is not more than 90 degree.
In an alternative embodiment of the invention, the air inlet supervisor other end is the blind end of arcuate structure, the arcuate structure angle
Spend for 90~180 degree.
In an alternative embodiment of the invention, the air inlet 2011 have helicitic texture, for extraneous gas distributor
Connection.
As shown in figure 5, in another embodiment, said nozzle further comprises：Fixed part 501, wherein,
The fixed part 501 includes supervisor's passage and at least three branch passageways；
Supervisor's passage, for placing the air inlet supervisor 201, the outer wall that its inwall is responsible for the air inlet is fitted,
The air inlet supervisor is supported with fixed；
Each described branch passageway, for placing a going out gas branch pipe 202, its inwall and an outlet branch
The outer wall laminating of pipe, the going out gas branch pipe is supported with fixed.
Scheme provided in an embodiment of the present invention, at least has the advantages that：
1., can be very because the CNT modulus of elasticity and fracture strength that are included in the lining of lined compound pipe are higher
Increase the toughness of lined compound pipe well, and antioxidant can avoid CNT be oxidized lose original modulus of elasticity and
Fracture strength, therefore, lined compound pipe provided in an embodiment of the present invention have stronger toughness, effectively subtract in use
Risk of breakage is lacked.
2. in embodiments of the present invention, by ensureing that the quality of antioxidant is the lined compound pipe gross mass
0.01%~0.5%, antioxidant granularity is 1 μm~15 μm, can be effectively prevented from CNT and be oxidized, so as to ensure that
The toughness and wearability of lined compound pipe.
3. the nozzle manufactured using lined compound pipe provided in an embodiment of the present invention, at least three outlets included due to it
Any two angle formed between branch pipe is not mutually equal；Going out gas branch pipe eluting gas has rotatory, so as to ensure gas point
Dissipate more uniform.
4. air inlet supervisor's other end is the blind end of arcuate structure, the arcuate structure angle is 90~180 degree, Ke Yiyou
Effect particulate matter is avoided to enter nozzle, so as to avoid nozzle blockage.
5. the supervisor's passage included by fixed part is placed air inlet and is responsible for, the outer wall that its inwall is responsible for air inlet is fitted, with
The fixed support air inlet supervisor；And each the described branch passageway included by fixed part, go out for placing described in one
Gas branch pipe, its inwall is fitted with the outer wall of a going out gas branch pipe, and the going out gas branch pipe is supported with fixed.
It should be noted that herein, such as first and second etc relational terms are used merely to an entity
Or operation makes a distinction with another entity or operation, and not necessarily require or imply exist between these entities or operation
Any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant be intended to it is non-
It is exclusive to include, so that process, method, article or equipment including a series of key elements not only include those key elements,
But also other key elements including being not expressly set out, or also include solid by this process, method, article or equipment
Some key elements.In the absence of more restrictions, the key element limited by sentence " including one ", is not arranged
Except also there is other identical factor in the process including the key element, method, article or equipment.
It is last it should be noted that：Presently preferred embodiments of the present invention is the foregoing is only, the skill of the present invention is merely to illustrate
Art scheme, is not intended to limit the scope of the present invention.Any modification for being made within the spirit and principles of the invention,
Equivalent substitution, improvement etc., are all contained in protection scope of the present invention.
Claims (10)
1. a kind of lined compound pipe, it is characterised in that including：Outer tubular wall and the lining being attached in the outer tubular wall,
Wherein,
The outer tubular wall includes ferro element；
The lining includes aluminum oxide, CNT and antioxidant.
2. lined compound pipe according to claim 1, it is characterised in that
The quality of the CNT is the 0.01%~0.5% of the lined compound pipe gross mass.
3. lined compound pipe according to claim 1 or 2, it is characterised in that
The quality of the antioxidant is the 0.01%~0.5% of the lined compound pipe gross mass.
4. according to any described lined compound pipe of claims 1 to 3, it is characterised in that
The antioxidant granularity is 1 μm~15 μm.
5. a kind of preparation method of lined compound pipe, it is characterised in that including：
Aluminium powder and brown iron oxide are mixed and are put into the tubular die of certain internal diameter；
CNT and antioxidant are mixed into the aluminium powder and the brown iron oxide after mixing；
Under an inert atmosphere, the aluminium powder and the brown iron oxide after mixing are heated to molten by Resistant heating mode
State, carries out thermit reaction；
Pass through the iron of molten condition that is generated to the CNT, the antioxidant and thermit reaction and molten condition
Aluminum oxide is centrifuged, and the iron of the molten condition forms outer tubular wall, the oxygen of the molten condition along the tubular die
Change the lining that aluminium, the CNT and antioxidant formation are attached in the outer tubular wall.
6. a kind of nozzle of any described lined compound pipe manufacture of utilization Claims 1-4 4, it is characterised in that including：Air inlet
Supervisor and at least three going out gas branch pipe, wherein,
The air inlet supervisor is the lined compound pipe of the first internal diameter, and each described going out gas branch pipe is that the lining of the second internal diameter is combined
Pipe, wherein, first internal diameter is more than second internal diameter；
The air inlet supervisor includes the air inlet positioned at one end and at least three gas outlets on the wall of side；
Each described gas outlet is connected between a going out gas branch pipe, at least three going out gas branch pipe in a welding manner
Any two angle of formation is not mutually equal；
External reaction gas enters the air inlet pipe by the air inlet, and passes through the gas outlet and the corresponding outlet branch
Pipe flows out.
7. nozzle according to claim 6, it is characterised in that
It is 3~400mm that corresponding first internal diameter is responsible in the air inlet；Corresponding second internal diameter of the going out gas branch pipe for 2~
200mm。
8. nozzle according to claim 6, it is characterised in that
Angle between the air inlet and the line of target gas outlet and the going out gas branch pipe of target gas outlet connection is little
In 90 degree.
9. according to any described nozzle of claim 6 to 8, it is characterised in that
The air inlet supervisor other end is the blind end of arcuate structure, and the arcuate structure angle is 90~180 degree；
And/or,
The air inlet has helicitic texture, for being connected with extraneous gas distributor.
10. according to any described nozzle of claim 6 to 9, it is characterised in that further comprise：Fixed part, wherein,
The fixed part includes supervisor's passage and at least three branch passageways；
Supervisor's passage, for placing the air inlet supervisor, the outer wall that its inwall is responsible for the air inlet is fitted, with fixed branch
Support the air inlet supervisor；
Each described branch passageway, for placing a going out gas branch pipe, its inwall and going out gas branch pipe outside
Wall is fitted, and the going out gas branch pipe is supported with fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710495330.6A CN107126911A (en) | 2017-06-26 | 2017-06-26 | A kind of lined compound pipe, preparation method and nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710495330.6A CN107126911A (en) | 2017-06-26 | 2017-06-26 | A kind of lined compound pipe, preparation method and nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107126911A true CN107126911A (en) | 2017-09-05 |
Family
ID=59736926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710495330.6A Pending CN107126911A (en) | 2017-06-26 | 2017-06-26 | A kind of lined compound pipe, preparation method and nozzle |
Country Status (1)
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