CN113530346A - Steel chimney pure titanium plate anti-corrosion device and laying method thereof - Google Patents

Steel chimney pure titanium plate anti-corrosion device and laying method thereof Download PDF

Info

Publication number
CN113530346A
CN113530346A CN202110976454.2A CN202110976454A CN113530346A CN 113530346 A CN113530346 A CN 113530346A CN 202110976454 A CN202110976454 A CN 202110976454A CN 113530346 A CN113530346 A CN 113530346A
Authority
CN
China
Prior art keywords
titanium
titanium plate
steel
plate
keel
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
Application number
CN202110976454.2A
Other languages
Chinese (zh)
Inventor
房孝维
何育东
陶明
李兴华
余昭
吴晓龙
何仰朋
孟令海
宦宣州
李楠
王韶晖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202110976454.2A priority Critical patent/CN113530346A/en
Publication of CN113530346A publication Critical patent/CN113530346A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/28—Chimney stacks, e.g. free-standing, or similar ducts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
    • E04B1/642—Protecting metallic construction elements against corrosion
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F17/00—Vertical ducts; Channels, e.g. for drainage
    • E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F17/00—Vertical ducts; Channels, e.g. for drainage
    • E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
    • E04F17/026—Exterior cladding, e.g. of chimney parts extending above the roof; Rain covers for chimney tops without draught-inducing aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F23J13/02—Linings; Jackets; Casings

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chimneys And Flues (AREA)

Abstract

The invention discloses a steel chimney pure titanium plate anti-corrosion device and a laying method thereof, and the steel chimney pure titanium plate anti-corrosion device comprises a steel inner cylinder, a plurality of titanium plate assemblies and a plurality of keel connecting pieces, wherein each titanium plate assembly is sequentially distributed along the circumferential direction and comprises a plurality of titanium plates which are sequentially distributed from top to bottom, two adjacent titanium plates correspond to the keel connecting pieces, and the keel connecting pieces comprise U-shaped titanium strip keels and U-shaped steel plate keels with holes; two adjacent titanium plates are upper portion titanium plate and lower part titanium plate respectively, U type band opening steel sheet fossil fragments distribute on the inner wall of steel inner tube, one side of U type titanium strip fossil fragments inserts in U type band opening steel sheet fossil fragments, the opposite side of U type titanium strip fossil fragments is connected with one side that corresponds the upper portion titanium plate lower extreme, the upper end of lower part titanium plate is connected with the opposite side of upper portion titanium plate lower extreme, it has the acid-resistant foam material layer of high temperature to fill between the inner wall of steel inner tube and upper portion titanium plate and the lower part titanium plate, the device's is with low costs, and it is convenient to lay, welding equipment simple structure simultaneously.

Description

Steel chimney pure titanium plate anti-corrosion device and laying method thereof
Technical Field
The invention belongs to the technical field of chimney corrosion prevention, and relates to a steel chimney pure titanium plate corrosion prevention device and a laying method thereof.
Background
Flue gas treated by the wet desulphurization process of the thermal power plant has strong corrosivity. The titanium is easy to generate a stable passive film on the surface, so that the corrosion of desulfurized strong corrosive flue gas to a titanium plate is very small, and the titanium plate is one of chimney anticorrosion linings recommended by the International Industrial chimney Association under the condition that GGH is not set in wet desulphurization.
At present, there are two main schemes for applying titanium metal to corrosion prevention of chimneys: one adopts a titanium steel composite board scheme; one is to adopt a pure titanium plate scheme. Both solutions have the advantages of good anticorrosion effect, no maintenance and the like. However, the titanium steel composite plate is used as the lining, and the defects of overlarge material consumption, overweight integral anticorrosion structure, more exposed welding seams, easy occurrence of welding seam slag inclusion defect, overhigh cost, long construction period and the like exist. And the pure titanium plate scheme has the characteristics of low cost, short construction period, long service life and higher cost performance than the titanium steel composite plate.
The Chinese patent 'steel chimney inner barrel anticorrosion device' (CN 201649778U) realizes the connection of the steel keel and the pure titanium plate by using a mechanical connection mode of the titanium screw and the steel nut, and then connects the steel nut and the steel keel as well as the titanium bolt head and the titanium plate in a welding mode to achieve the purpose of sealing. However, the connection method is complicated in process, cracks are easy to appear at the welding position in the processes of vibration, thermal expansion and cold contraction, and great potential safety hazards exist; in addition, the Chinese patent "a pure titanium plate anticorrosion treatment structure of chimney steel inner cylinder and steel structure flue" (CN 203808594U) adopts Japanese resistance welding technology to compound the steel keel on the titanium plate, and then welds the steel keel on the steel inner cylinder. The technical scheme does not adopt high-temperature acid-resistant materials, welding is firm, but the resistance welding process needs to be finished in a factory, welding equipment is complex, and cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the steel chimney pure titanium plate anticorrosion device and the laying method thereof.
In order to achieve the purpose, the steel chimney pure titanium plate anti-corrosion device comprises a steel inner cylinder, a plurality of titanium plate assemblies and a plurality of keel connecting pieces, wherein the titanium plate assemblies are sequentially distributed along the circumferential direction and comprise a plurality of titanium plates which are sequentially distributed from top to bottom, two adjacent titanium plates correspond to the keel connecting pieces, and the keel connecting pieces comprise U-shaped titanium strip keels and U-shaped steel plate keels with holes;
two adjacent titanium boards are upper portion titanium board and lower part titanium board respectively, and U-shaped band hole steel sheet fossil fragments distribute on the inner wall of steel inner tube, and one side of U-shaped titanium strip fossil fragments inserts in U-shaped band hole steel sheet fossil fragments, and the opposite side of U-shaped titanium strip fossil fragments is connected with one side that corresponds upper portion titanium board lower extreme, and the upper end of lower part titanium board is connected with the opposite side of upper portion titanium board lower extreme, and it has the acid-resistant foam material layer of high temperature to fill between the inner wall of steel inner tube and upper portion titanium board and the lower part titanium board.
In two adjacent titanium plate assemblies, each titanium plate in the left titanium plate assembly is lapped on the adjacent titanium plate in the right titanium plate assembly.
The U-shaped steel keel with the hole is welded on the steel inner cylinder to form a plurality of first welding points, wherein each first welding point is positioned on the upper side and the lower side of the U-shaped steel keel with the hole.
The upper titanium plate and the lower titanium plate are welded, and the U-shaped titanium strip keel and the upper titanium plate are welded to form a plurality of second welding points.
The U-shaped steel plate keel with the hole is provided with a through hole for the corresponding U-shaped titanium strip keel to pass through.
And the adjacent upper titanium plate and the lower titanium plate are welded and sealed.
And keel components corresponding to two adjacent titanium plates are distributed at equal intervals.
The laying method of the steel chimney pure titanium plate anticorrosion device comprises the following steps:
1) cleaning the inner wall of the steel inner cylinder;
2) welding each U-shaped steel plate keel with a hole on the steel inner cylinder to form a first welding point;
3) filling a high-temperature acid-resistant foam material layer, and welding the U-shaped titanium strip keel, the upper titanium plate and the lower titanium plate to form a second welding spot;
4) and inserting the U-shaped titanium strip keel into the through hole on the U-shaped steel plate keel with the hole, and then welding and sealing the adjacent upper titanium plate and the lower titanium plate to obtain the pure titanium plate anticorrosive device for the steel chimney.
Step 4) is followed by: and (4) inspecting the welding seam by using a nondestructive testing method, and ensuring that 100% of welding quality is qualified.
The invention has the following beneficial effects:
according to the steel chimney pure titanium plate anti-corrosion device and the laying method thereof, during specific operation, the inner wall of the steel inner cylinder is covered by the titanium material, and the excellent corrosion resistance of titanium metal is utilized to meet the corrosion resistance requirement of the chimney during flue gas emission after desulfurization; in addition, the mode that adoption U type band hole steel sheet fossil fragments and U type titanium strip fossil fragments adopted to articulate, no weldment work, firm in connection, with low costs, lay the convenience, simultaneously, single U type titanium strip fossil fragments and U type band hole steel sheet fossil fragments small, with low costs, reduce the weldment work volume of anticorrosive system, reduce the dead weight of anticorrosive system, it is less to chimney foundation structure influence, and welding equipment simple structure, with low costs.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a three-dimensional view of a U-shaped perforated steel plate keel 4;
fig. 3 is a three-dimensional view of a U-shaped titanium bar keel 6;
FIG. 4 is a developed view of the upper titanium plate 5 and the lower titanium plate 8 laid on the inner wall of the steel inner cylinder 1.
Wherein, 1 is a steel inner cylinder, 2 is a high-temperature acid-resistant foam material layer, 3 is a first welding point, 4 is a U-shaped steel plate keel, 5 is an upper titanium plate, 6 is a U-shaped titanium strip keel, 7 is a second welding point, and 8 is a lower titanium plate.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1 to 4, the steel chimney pure titanium plate corrosion prevention device comprises a steel inner cylinder 1, a plurality of titanium plate assemblies and a plurality of keel connecting pieces, wherein the titanium plate assemblies are sequentially distributed along the circumferential direction and comprise a plurality of titanium plates which are sequentially distributed from top to bottom, two adjacent titanium plates correspond to the keel connecting pieces, and each keel connecting piece comprises a U-shaped titanium strip keel 6 and a U-shaped steel plate keel 4; the two adjacent titanium plates are respectively an upper titanium plate 5 and a lower titanium plate 8, the U-shaped perforated steel plate keel 4 is distributed on the inner wall of the steel inner cylinder 1, one side of the U-shaped titanium strip keel 6 is inserted into the U-shaped perforated steel plate keel 4, the other side of the U-shaped titanium strip keel 6 is connected with one side corresponding to the lower end of the upper titanium plate 5, the upper end of the lower titanium plate 8 is connected with the other side of the lower end of the upper titanium plate 5, and a high-temperature acid-resistant foam material layer 2 is filled between the inner wall of the steel inner cylinder 1 and the upper titanium plate 5 as well as between the inner wall of the steel inner cylinder 1 and the lower titanium plate 8; in two adjacent titanium plate assemblies, each titanium plate in the left titanium plate assembly is lapped on the adjacent titanium plate in the right titanium plate assembly.
The U-shaped steel keel with the hole 4 is welded on the steel inner barrel 1 to form a plurality of first welding spots 3, wherein each first welding spot 3 is positioned at the upper side and the lower side of the U-shaped steel keel with the hole 4; the upper titanium plate 5 and the lower titanium plate 8 are welded, and the U-shaped titanium strip keels 6 and the upper titanium plate 5 are welded to form a plurality of second welding points 7.
The U-shaped steel plate keel 4 is provided with a through hole for the corresponding U-shaped titanium strip keel 6 to pass through; the adjacent upper titanium plate 5 and the lower titanium plate 8 are welded and sealed; and keel components corresponding to two adjacent titanium plates are distributed at equal intervals.
The laying method of the steel chimney pure titanium plate anti-corrosion device comprises the following steps:
1) cleaning the inner wall of the steel inner cylinder 1;
2) welding each U-shaped steel keel with a hole 4 on the steel inner cylinder 1 to form a first welding point 3;
3) filling the high-temperature acid-resistant foam material layer 2, and welding the U-shaped titanium strip keel 6, the upper titanium plate 5 and the lower titanium plate 8 to form a second welding point 7;
4) inserting the U-shaped titanium strip keel 6 into the through hole on the U-shaped steel plate keel 4, and then welding and sealing the adjacent upper titanium plate 5 and the lower titanium plate 8;
5) and (4) inspecting the welding seam by using a nondestructive testing method, and ensuring that 100% of welding quality is qualified.
Example one
In the embodiment, the inner diameter of the steel inner cylinder 1 is 7.7m, and the height of the steel inner cylinder 1 is 204 m; the length of the upper titanium plate 5 and the lower titanium plate 8 was 6020mm, the width of the upper titanium plate 5 and the lower titanium plate 8 was 1220mm, and the thickness of the upper titanium plate 5 and the lower titanium plate 8 was 1.6 mm. At the moment, the interval in the horizontal direction of the circumference of the chimney is 1200mm, the interval in the vertical direction is 1200mm, the U-shaped steel plate keel 4 is welded on the steel inner cylinder 1 by carbon dioxide arc welding, the upper side and the lower side of the U-shaped steel plate keel 4 are both welded on the steel inner cylinder 1 during welding, so that a first welding point 3 is formed, and the height of the overlapped part of the upper titanium plate 5 and the lower titanium plate 8 is 20 mm.
Before welding, the inner wall of the steel inner cylinder 1 is subjected to surface treatment to be smooth and expose a metal layer, a place with serious corrosion is repaired and used, and the surface of the inner wall of the steel inner cylinder 1 meeting the construction requirement is welded with the U-shaped perforated steel plate keel 4 by adopting carbon dioxide arc welding.
After the U-shaped perforated steel plate keel 4 is welded, the high-temperature acid-resistant foam material layer 2 is filled, and meanwhile, a space for hanging and inserting the U-shaped titanium strip keel 6 is reserved above the U-shaped perforated steel plate keel 4.
Welding the U-shaped titanium strip keel 6 on the upper titanium plate 5 by using argon arc welding to form a second welding spot 7, and welding the upper side, the lower side, the left side and the right side of the U-shaped titanium strip keel 6 on the upper titanium plate 5 during welding;
and inserting the U-shaped titanium strip keels 6 into the through holes in the U-shaped steel plate keels 4, and welding and sealing the upper titanium plate 5 and the lower titanium plate 8 after the U-shaped titanium strip keels 6 are inserted.
And finally, performing 100% inspection on the welding seam by using a nondestructive testing method, and ensuring that 100% of welding quality is qualified.
Finally, it should be noted that the present invention is illustrated by the above embodiments, but the present invention is not limited to the above embodiments, that is, the present invention is not limited to the above embodiments. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (10)

1. The steel chimney pure titanium plate corrosion prevention device is characterized by comprising a steel inner cylinder (1), a plurality of titanium plate assemblies and a plurality of keel connecting pieces, wherein the titanium plate assemblies are sequentially distributed along the circumferential direction and comprise a plurality of titanium plates which are sequentially distributed from top to bottom, two adjacent titanium plates correspond to the keel connecting pieces, and the keel connecting pieces comprise U-shaped titanium strip keels (6) and U-shaped steel plate keels (4);
two adjacent titanium boards are upper portion titanium board (5) and lower part titanium board (8) respectively, and U type area hole steel sheet fossil fragments (4) distribute on the inner wall of steel inner tube (1), and one side of U type titanium strip fossil fragments (6) inserts in U type area hole steel sheet fossil fragments (4), and the opposite side of U type titanium strip fossil fragments (6) is connected with one side that corresponds upper portion titanium board (5) lower extreme, and the upper end of lower part titanium board (8) is connected with the opposite side of upper portion titanium board (5) lower extreme.
2. The steel chimney pure titanium plate corrosion prevention device according to claim 1, wherein in two adjacent titanium plate assemblies, each titanium plate in the left titanium plate assembly is lapped on the adjacent titanium plate in the right titanium plate assembly.
3. The steel chimney pure titanium plate corrosion prevention device according to claim 1, characterized in that the U-shaped perforated steel plate keel (4) is welded to the steel inner cylinder (1) to form a plurality of first welding points (3), wherein each first welding point (3) is located on the upper and lower sides of the U-shaped perforated steel plate keel (4).
4. The steel chimney pure titanium plate corrosion prevention device according to claim 3, characterized in that the upper titanium plate (5) and the lower titanium plate (8) are welded together, and the U-shaped titanium strip keels (6) and the upper titanium plate (5) are welded together to form a plurality of second welding points (7).
5. The steel chimney pure titanium plate corrosion prevention device according to claim 1, characterized in that a through hole for a corresponding U-shaped titanium strip keel (6) to pass through is formed in the U-shaped perforated steel plate keel (4).
6. The steel chimney pure titanium plate corrosion prevention device according to claim 1, characterized in that adjacent upper titanium plates (5) and lower titanium plates (8) are welded and sealed.
7. The steel chimney pure titanium plate corrosion prevention device according to claim 1, wherein keel assemblies corresponding to two adjacent titanium plates are distributed at equal intervals.
8. The steel chimney pure titanium plate corrosion prevention device according to claim 1, characterized in that a high-temperature acid-resistant foam material layer (2) is filled between the inner wall of the steel inner cylinder (1) and the upper titanium plate (5) and the lower titanium plate (8).
9. A laying method of a steel chimney pure titanium plate anti-corrosion device is characterized by comprising the following steps:
1) cleaning the inner wall of the steel inner cylinder (1);
2) welding each U-shaped steel plate keel (4) with a hole on the steel inner cylinder (1) to form a first welding point (3);
3) filling a high-temperature acid-resistant foam material layer (2), and welding the U-shaped titanium strip keel (6), the upper titanium plate (5) and the lower titanium plate (8) to form a second welding point (7);
4) and inserting the U-shaped titanium strip keel (6) into the through hole on the U-shaped steel plate keel (4) with the hole, and then welding and sealing the adjacent upper titanium plate (5) and the lower titanium plate (8) to obtain the pure titanium plate anticorrosive device for the steel chimney.
10. The laying method of the steel chimney pure titanium plate corrosion prevention device according to claim 9, characterized by further comprising, after the step 4): and (4) inspecting the welding seam by using a nondestructive testing method, and ensuring that 100% of welding quality is qualified.
CN202110976454.2A 2021-08-24 2021-08-24 Steel chimney pure titanium plate anti-corrosion device and laying method thereof Pending CN113530346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110976454.2A CN113530346A (en) 2021-08-24 2021-08-24 Steel chimney pure titanium plate anti-corrosion device and laying method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110976454.2A CN113530346A (en) 2021-08-24 2021-08-24 Steel chimney pure titanium plate anti-corrosion device and laying method thereof

Publications (1)

Publication Number Publication Date
CN113530346A true CN113530346A (en) 2021-10-22

Family

ID=78092041

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110976454.2A Pending CN113530346A (en) 2021-08-24 2021-08-24 Steel chimney pure titanium plate anti-corrosion device and laying method thereof

Country Status (1)

Country Link
CN (1) CN113530346A (en)

Similar Documents

Publication Publication Date Title
CN101774063B (en) Defect repair welding process of stainless steel composite board coating
US8720146B2 (en) Suspended ceiling structure for refrigerated storage and construction method thereof
CN102967169B (en) A kind of exchanger tubes and tubesheets attachment structure preventing shell side side clearance from corroding
CN111441637A (en) Large storage tank with stainless steel composite plates manufactured on site and installation method of large storage tank
CN1565788A (en) Bridge steel structure welding procedure in working field
CN114165099B (en) Modularized construction method of large tower
CN109028119A (en) A kind of anti-corrosion chimney and its construction method of installation
CN101812936B (en) Anticorrosion device for inner cylinder of steel chimney
CN215803633U (en) Anticorrosive device of pure titanium plate of steel chimney
CN113530346A (en) Steel chimney pure titanium plate anti-corrosion device and laying method thereof
CN201649778U (en) Steel chimney internal cylinder corrosion prevention device
CN203784976U (en) Corrosion protection system for heat-engine plant chimney inner barrel
CN213840041U (en) B-type sleeve for repairing circumferential weld defects of oil and gas pipelines
CN212107191U (en) Full-coated high-temperature heat-insulation fixed pipe carrier
CN104498996A (en) Temperature-regulating and deformation-preventing structure for aluminum electrolysis cell shell
CN107052630A (en) A kind of sleeve-type chimney titanium steel composite board weld joint protective device and application method
CN103850514B (en) The Titanium board rotproofing structure of a kind of inner steel cylinder of chimney, steel construction flue and method
CN104727213B (en) Assembly type steel reinforced concrete arch bridge T beam slab
CN105983759B (en) Steel feed bin assembling and welding method under high humidity environment
CN212537891U (en) Carbon steel flue/chimney lining stainless steel plate structure
CN104949143A (en) Thermal power plant chimney inner cylinder anti-corrosion system and method thereof
CN204952604U (en) High silicon steel composite sheet and high silicon steel composite sheet sulphuric acid absorption tower
CN204531583U (en) A kind of brick internal cylinder chimney Titanium board anti-corrosive apparatus
CN112658513A (en) Welding method for main propeller base of deep water dynamic positioning crude oil conveying device
CN212837020U (en) Large-scale storage tank of stainless steel composite sheet of on-spot preparation

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