CN114857390B - Elbow pipe with petal-shaped structure - Google Patents
Elbow pipe with petal-shaped structure Download PDFInfo
- Publication number
- CN114857390B CN114857390B CN202210646415.0A CN202210646415A CN114857390B CN 114857390 B CN114857390 B CN 114857390B CN 202210646415 A CN202210646415 A CN 202210646415A CN 114857390 B CN114857390 B CN 114857390B
- Authority
- CN
- China
- Prior art keywords
- petal
- shaped hole
- hole section
- elbow
- wall surface
- 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.)
- Active
Links
- 230000003628 erosive effect Effects 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims description 24
- 239000012530 fluid Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000004576 sand Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000003116 impacting effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- VUACHFWYFDCGJF-UNTBIKODSA-N (1r)-7-methoxy-1-[(4-methoxyphenyl)methyl]-2,2-dimethyl-3,4-dihydro-1h-isoquinolin-2-ium-8-ol;chloride Chemical compound [Cl-].C1=CC(OC)=CC=C1C[C@H]1[N+](C)(C)CCC2=CC=C(OC)C(O)=C21 VUACHFWYFDCGJF-UNTBIKODSA-N 0.000 description 1
- 241001184547 Agrostis capillaris Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
Abstract
The bent pipe with the petal-shaped structure comprises a bent pipe body, wherein a petal-shaped hole section is formed at the position of an inlet end or a position close to the inlet end through a circulation channel, and the petal-shaped hole section is formed by jointly enclosing four semicircular inner walls, so that the erosion resistance of the bent pipe body is optimized, and the bent pipe has the advantages of being small in technical difficulty, simple in manufacturing process and low in cost.
Description
Technical Field
The invention relates to the field of gas-solid two-phase flow conveying pipelines, in particular to an elbow pipe with a petal-shaped structure.
Background
Erosion is the process of surface wear damage caused by particles carried in a fluid striking a surface at high velocity. The erosion can bring great problems to the transportation industries of petroleum, natural gas and the like, so that the wall surface of the bent pipe is thinned, even leakage of petroleum or natural gas and the like is caused by damage, and the safety operation of equipment is influenced. The elbow is more susceptible to failure by erosion as a component of the flow direction change. Studies have shown that the extent of erosion damage at the bend of the transfer line is about 50 times that of the straight tube portion. Erosion damage not only wastes materials, consumes energy and reduces equipment efficiency, but also accelerates equipment failure and reduces the service life of equipment, thereby leading to larger economic loss.
The current method for improving erosion mainly utilizes methods such as composite materials, surface coatings, surface modification and the like to improve the erosion resistance of the bent pipe, and the method can reduce erosion to a certain extent, but has the defects of high manufacturing difficulty, high cost and adverse energy greening.
Disclosure of Invention
Therefore, the invention provides the elbow with the petal-shaped structure, which comprises an elbow body, wherein a petal-shaped hole section is formed at the position of the inlet end or the position close to the inlet end through a circulation channel, and the petal-shaped hole section is formed by jointly enclosing four semicircular inner walls, so that the erosion resistance of the elbow body is optimized, and the elbow has the advantages of small technical difficulty, simple manufacturing process and low cost.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention provides a bent pipe with a petal-shaped structure, which comprises a bent pipe body, wherein the bent pipe body is provided with an inlet end, an outlet end and a flow channel communicated with the inlet end and the outlet end, the flow channel is provided with a petal-shaped hole section at the position of the inlet end or the position close to the inlet end, and the petal-shaped hole section is formed by jointly enclosing four semicircular inner walls.
The preferable technical scheme of the invention is that the petal-shaped hole section is positioned in the range of a central angle extending 0-30 degrees from the inlet end to the outlet end.
The preferable technical scheme of the invention is that the extension length of the petal-shaped hole section is the arc length corresponding to the central angle of 5 degrees.
The preferable technical scheme of the invention is that the petal-shaped hole section is positioned in the range of a central angle which takes the inlet end as a starting position and extends 20-30 degrees towards the outlet end.
The preferred technical scheme of the invention is that the radius of the semicircular inner wall of the petal-shaped hole section is 0.44-0.48 times of the diameter of the circulation channel.
The preferred solution of the present invention is that the flow channels and the petaline holes Duan Gongzhou.
The technical scheme provided by the invention has the following beneficial effects:
1. the petal-shaped hole sections change the movement track of particles entering the inner wall surface of the bent pipe body, reduce the collision times of the particles and the inner wall surface, and further reduce erosion.
2. The petal-shaped hole sections change the flow field distribution at the inner wall surface of the elbow body, when fluid flows through the inside of the elbow body, the flow velocity at the inner wall surface of the elbow body is reduced, a low-speed countercurrent circulation zone is formed, the inner wall surface of the elbow body is protected, the speed of particles striking the inner wall surface of the elbow body is reduced, and therefore erosion is reduced.
3. The petal-shaped hole section not only can improve the erosion resistance inside the bent pipe body, but also has the advantages of small technical difficulty, simple manufacturing process and low cost.
Drawings
FIG. 1 is a schematic view of an elbow having a petal-shaped structure, wherein a portion of the elbow is peeled away to reveal a petal-shaped aperture section for the purpose of displaying the petal-shaped aperture section;
FIG. 2 is a schematic structural view of an elbow having a petal-shaped structure;
FIG. 3 is a schematic view of a petal-shaped structure;
FIG. 4 is a position where the petal-shaped aperture segments are disposed in the range of 20-25;
FIG. 5 is a graph showing a comparison of maximum erosion rates in a range of 0-30 degrees for a common elbow and an elbow having a petal-shaped structure, wherein a red broken line represents the common elbow and a black broken line represents the elbow having the petal-shaped structure;
FIG. 6 is a schematic view of particle trajectories of a conventional elbow and an elbow having a petal-shaped structure;
FIG. 7 is a schematic diagram of a high-speed flow area of a common elbow and a low-speed countercurrent area of the elbow with a petal-shaped structure;
in the figure:
1. a bent pipe body; 2. an inlet end; 3. an outlet end; 4. a flow channel; 5. petal-shaped hole sections.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
Referring to fig. 1 to 7, there is shown:
the invention provides a bent pipe with a petal-shaped structure, which comprises a bent pipe body 1, wherein the bent pipe body 1 is provided with an inlet end 2, an outlet end 3 and a flow channel 4 for communicating the inlet end 2 and the outlet end 3, the flow channel 4 is provided with a petal-shaped hole section 5 at the position of the inlet end 2 or the position close to the inlet end 2, as shown in figure 3, the petal-shaped hole section 5 is formed by surrounding four semicircular inner walls together, through the arrangement, the petal-shaped hole section 5 changes the movement track of particles entering the inner wall surface of the bent pipe body 1, reduces the collision times of the particles and the inner wall surface of the bent pipe body 1, further reduces erosion, the petal-shaped hole section 5 also changes the flow field distribution at the inner wall surface of the bent pipe body 1, and when fluid flows through the petal-shaped hole section 5, the flow velocity at the inner wall surface of the bent pipe body 1 is reduced, a low-speed countercurrent circulation area is formed, the inner wall surface of the bent pipe body 1 is protected, and the erosion is reduced due to the speed of the particles impacting the inner wall surface of the bent pipe body 1, compared with a composite material, a coating, a high-cost impact-resistant method with high-manufacturing difficulty is realized, the petal-shaped hole section 5 can not only improve the inner part of the bent pipe 1, but also has the advantages of simple manufacturing technology and low manufacturing cost.
Preferably, the petal-shaped hole section 5 is located in a central angle range extending 0 ° -30 ° from the inlet end 2 to the outlet end 3, that is, the initial position of the inlet end 2 is 0 °, and a position larger than 0 ° is a position close to the inlet end 2, so that the petal-shaped hole section 5 changes a particle motion track at the inner wall surface of the elbow body 1, reduces the collision times of particles and the inner wall surface of the elbow body 1, further reduces erosion, the petal-shaped hole section 5 also changes flow field distribution at the inner wall surface of the elbow body 1, and when fluid flows through the petal-shaped hole section 5, the flow velocity at the inner wall surface of the elbow body 1 is reduced, so that a low-speed countercurrent circulation zone is formed, the inner wall surface of the elbow body 1 is protected, and the erosion is reduced due to the speed of the particles striking the inner wall surface of the elbow body 1, compared with a composite material, a coating, a high-surface modification and other erosion-resistant method is high in manufacturing difficulty, and the petal-shaped hole section 5 can not only improve the erosion-resistant characteristics inside the elbow body 1, but also has the advantages of simpler manufacturing process, because the petal-shaped hole section 5 is only arranged in a range extending 0 ° -30 ° from the initial position to the inlet end 2.
Preferably, the extension length of the petal-shaped hole section 5 is the arc length corresponding to the central angle of 5 degrees, and the arrangement is such that the petal-shaped hole section 5 has the best erosion resistance, if the extension length of the petal-shaped hole section 5 is larger than the arc length corresponding to the central angle of 5 degrees, the petal-shaped hole section 5 cannot play an erosion resistance role, so that the petal-shaped hole section 5 becomes an erosion area; if the extension length of the petal-shaped hole segment 5 is smaller than the arc length corresponding to the central angle of 5 degrees, the manufacturing process is difficult, so that the extension length of the petal-shaped hole segment 5 is preferably the arc length corresponding to the central angle of 5 degrees.
Preferably, the petal-shaped hole section 5 is located in a central angle range extending 20 ° -30 ° from the inlet end 2 to the outlet end 3, in which the elbow body 1 is made of aluminum, the diameter D of the circulation channel is 50mm, and the gas-solid two-phase flow in the elbow body 1 is air and sand respectively. The density of the air was 1.18kg/m 3 Viscosity 1.8X10 -5 Pa.s, flow rate of 30m/s, sand density of 2650kg/m 3 The grain diameter of sand is 100 mu m, the mass flow rate of the sand is 0.02kg/s, and the speed of the sand entering the bent pipe body 1 is the same as the air flow rate of the continuous phase. The radius R of the semicircular inner wall of the petal-shaped hole section 5 is 0.44D, namely the radius R of the semicircular inner wall of the petal-shaped hole section 5 is 22mm, as shown in figures, theta has certain erosion resistance in different angles, particularly, the petal-shaped hole section 5 is positioned at 20-25 degrees, namely the starting position is 20 degrees, the extension length of the petal-shaped hole section 5 corresponds to the arc length corresponding to the central angle of 5 degrees, namely the petal-shaped hole section 5 is positioned at 20-25 degrees, at this time, the erosion resistance of the bent pipe body 1 is improved by 17.27 percent, the best erosion resistance and wear resistance are achieved, in figure 5, the red dotted line represents the value of the corresponding maximum erosion rate of a common bent pipe in the range of 0-30 degrees, and the black broken line represents the value of the corresponding maximum erosion rate of the bent pipe with the petal-shaped structure in the range of 0-30 degrees.
In this embodiment, as shown in fig. 4, when the petal-shaped hole section 5 is located at a starting position of 20 °, the extension length of the petal-shaped hole section 5 is the arc length corresponding to the central angle of 5 °, that is, the petal-shaped hole section 5 is located in the angle θ of 20 ° -25 °, as shown in fig. 6, the left elbow is a common elbow, the right elbow is an elbow with a petal-shaped structure, and as can be seen from fig. 6, in the right elbow with a petal-shaped structure, when the continuous phase gas carrying solid sand flows through the petal-shaped hole section 5, the petal-shaped hole section 5 changes the particle track, so that particles rebound at the semicircular inner wall of the petal-shaped hole section 5, the kinetic energy of the particles is consumed, and the collision frequency between the particles and the inner wall surface of the elbow body is reduced, so that the erosion is reduced, and in the left common elbow, the continuous phase gas flow carrying the solid sand is basically straight, so that the inner wall surface of the common elbow is easier to break.
In this embodiment, as shown in fig. 4, when the petal-shaped hole section 5 is located at the starting position with 20 ° and the extension length of the petal-shaped hole section 5 is the arc length corresponding to the central angle of 5 °, that is, the petal-shaped hole section 5 is located in the angle θ of 20 ° -25 °, in fig. 7, the right side is a bent pipe with a petal-shaped structure, when the continuous phase gas carrying the solid sand particles flows through the petal-shaped hole section 5, the fluid is blocked and moves reversely, the flow velocity at the inner wall surface of the petal-shaped hole section 5 is reduced, a low-speed countercurrent circulation area is formed in the petal-shaped hole section, the speed of the particles impacting the inner wall surface of the bent pipe body 1 is reduced, a certain buffering effect is provided for the process of the particles impacting the wall surface of the bent pipe, and when the continuous phase gas carrying the solid sand particles flows through the bent pipe on the left side, it can be seen that the trace of the solid sand particles directly impacts the inner wall of the bent pipe, so that the bent pipe is easier to be eroded.
Preferably, the radius R of the semicircular inner wall of the petal-shaped hole section 5 is 0.44-0.48 times the diameter D of the flow channel 4, for example, when the diameter D of the flow channel 4 is 50mm, the radius R of the semicircular inner wall of the petal-shaped hole section 5 is a value ranging from 0.44D to 0.48D, that is, the radius R of the semicircular inner wall of the petal-shaped hole section 5 is a value ranging from 22mm to 24mm, which corresponds to the radius of the semicircular inner wall of the petal-shaped hole section 5 being retracted from 1mm to 3mm relative to the radius of the flow channel 4, the erosion resistance effect is the best when the radius is retracted within the range, no good erosion resistance effect is obtained when the radius is smaller than the range, and the probability of collision of particles with the petal-shaped hole section is increased when the radius is larger than the range, which is unfavorable for the optimized design of the erosion resistance structure.
Preferably, the circulation channel 4 and the petal-shaped hole segments 5 are coaxial, and the arrangement determines the posture of the petal-shaped hole segments 5 in the bent pipe body 1, ensures that the petal-shaped hole segments 5 have excellent erosion resistance all the time, and simultaneously ensures that the inner wall surface of the bent pipe body 1 has excellent erosion resistance.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The utility model provides an elbow with petal-shaped structure, includes elbow body (1), its characterized in that:
the elbow body (1) is provided with an inlet end (2), an outlet end (3) and a circulation channel (4) which is communicated with the inlet end (2) and the outlet end (3), wherein the circulation channel (4) is provided with a petal-shaped hole section (5) at the position of the inlet end (2) or the position close to the inlet end (2), and the petal-shaped hole section (5) is formed by jointly enclosing four semicircular inner walls;
the petal-shaped hole section (5) is positioned in a central angle range extending 0-30 degrees from the inlet end (2) to the outlet end (3) as a starting position;
the extension length of the petal-shaped hole section (5) is the arc length corresponding to the central angle of 5 degrees;
the radius of the semicircular inner wall of the petal-shaped hole section (5) is 0.44-0.48 times of the diameter of the circulation channel (4);
the petal-shaped hole section (5) changes the movement track of particles entering the inner wall surface of the elbow body (1), reduces the collision times of the particles and the inner wall surface of the elbow body (1), and also changes the flow field distribution at the inner wall surface of the elbow body (1), when fluid flows through the petal-shaped hole section (5), the flow velocity at the inner wall surface of the elbow body (1) is reduced, a low-speed countercurrent circulation zone is formed, the inner wall surface of the elbow body (1) is protected, and the erosion is reduced due to the reduction of the speed of the particles striking the inner wall surface of the elbow body (1).
2. The elbow with petal-shaped structure according to claim 1, characterized in that:
the petal-shaped hole section (5) is positioned in a central angle range extending 20-30 degrees from the inlet end (2) to the outlet end (3) as a starting position.
3. The elbow with petal-shaped structure according to claim 1, characterized in that:
the flow channel (4) is coaxial with the petal-shaped hole section (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210646415.0A CN114857390B (en) | 2022-06-09 | 2022-06-09 | Elbow pipe with petal-shaped structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210646415.0A CN114857390B (en) | 2022-06-09 | 2022-06-09 | Elbow pipe with petal-shaped structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114857390A CN114857390A (en) | 2022-08-05 |
| CN114857390B true CN114857390B (en) | 2024-03-29 |
Family
ID=82625458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210646415.0A Active CN114857390B (en) | 2022-06-09 | 2022-06-09 | Elbow pipe with petal-shaped structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114857390B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05321308A (en) * | 1992-05-25 | 1993-12-07 | Sekisui Chem Co Ltd | Drainage pipe and drainage pipe-line |
| JPH06123384A (en) * | 1992-10-12 | 1994-05-06 | Sekisui Chem Co Ltd | Pipe with inner surface spiral rib and drainage pipe line using this pipe |
| JP2016188663A (en) * | 2015-03-30 | 2016-11-04 | 京セラ株式会社 | Tubular body |
| CN210004007U (en) * | 2019-05-05 | 2020-01-31 | 浙江万盾制冷股份有限公司 | kinds of corrosion-resistant and impact-resistant elbow pipe |
| CN111102417A (en) * | 2019-12-12 | 2020-05-05 | 中国石油大学(华东) | Bent pipe with inner spiral fins on near-wall surface |
| CN215635653U (en) * | 2021-07-22 | 2022-01-25 | 中冶南方武汉建筑设计有限公司 | Energy dissipation return bend |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI663356B (en) * | 2017-12-18 | 2019-06-21 | 國家中山科學研究院 | Pipeline with lattice-shaped elbow channel |
-
2022
- 2022-06-09 CN CN202210646415.0A patent/CN114857390B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05321308A (en) * | 1992-05-25 | 1993-12-07 | Sekisui Chem Co Ltd | Drainage pipe and drainage pipe-line |
| JPH06123384A (en) * | 1992-10-12 | 1994-05-06 | Sekisui Chem Co Ltd | Pipe with inner surface spiral rib and drainage pipe line using this pipe |
| JP2016188663A (en) * | 2015-03-30 | 2016-11-04 | 京セラ株式会社 | Tubular body |
| CN210004007U (en) * | 2019-05-05 | 2020-01-31 | 浙江万盾制冷股份有限公司 | kinds of corrosion-resistant and impact-resistant elbow pipe |
| CN111102417A (en) * | 2019-12-12 | 2020-05-05 | 中国石油大学(华东) | Bent pipe with inner spiral fins on near-wall surface |
| CN215635653U (en) * | 2021-07-22 | 2022-01-25 | 中冶南方武汉建筑设计有限公司 | Energy dissipation return bend |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114857390A (en) | 2022-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100391617C (en) | Composite ceramic Raoult nozzle for cold spray coating | |
| CN114857390B (en) | Elbow pipe with petal-shaped structure | |
| CN100406130C (en) | Cold air powered spraying method and device | |
| CN104713412A (en) | On-line cleaning method | |
| CN106837877B (en) | Compressor casing with backflow guide structure and backflow guide method thereof | |
| CN105214428A (en) | Be applicable to the dust arrester of high temperature dust tail gas recycle | |
| CN109230549B (en) | Compound pneumatic conveying rotational flow elbow | |
| CN115489741A (en) | Air inlet energy-saving sand discharging device of helicopter engine based on vortex tube separator | |
| CN219140162U (en) | Bent pipe | |
| CN101905810A (en) | Flow-aiding device on material dilute phase conveying pipeline | |
| CN103037610B (en) | Launching device for single electrode producing low-temperature plasma flow under the atmospheric pressure condition | |
| CN206001186U (en) | A kind of tubular type dropping equipment | |
| CN109595418B (en) | Erosion-resistant tee pipe joint | |
| CN206814001U (en) | Powder-granule material Geldart-D particle elbow | |
| CN108798790A (en) | Blade profile tube nozzle for gas turbine | |
| CN207159255U (en) | A kind of blast-furnace coal powder shower nozzle | |
| CN216923614U (en) | Elbow for power steam pipeline | |
| CN219606383U (en) | Anti-impact noise reduction pipe fitting | |
| CN207034225U (en) | A kind of cryogenic high pressure pneumatic stopping valve | |
| CN115539740A (en) | Anti erosion bent pipe | |
| CN107312898A (en) | A kind of blast-furnace coal powder shower nozzle | |
| CN107082282A (en) | Powder-granule material Geldart-D particle elbow | |
| CN112173722B (en) | Fluid conveying device | |
| CN211175850U (en) | Large-caliber ultrahigh-pressure movable elbow | |
| CN210920495U (en) | Entrained flow coal gasification black water flash evaporation wear-resistant three-way pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |