CN203594906U - Three-sleeve pipe preheater - Google Patents
Three-sleeve pipe preheater Download PDFInfo
- Publication number
- CN203594906U CN203594906U CN201320520858.1U CN201320520858U CN203594906U CN 203594906 U CN203594906 U CN 203594906U CN 201320520858 U CN201320520858 U CN 201320520858U CN 203594906 U CN203594906 U CN 203594906U
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- pipe
- square
- flange
- sleeve pipe
- salt
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Abstract
The utility model discloses a three-sleeve pipe preheater and belongs to the technical field of alumina production. A square expansion bend is arranged between an inlet and an outlet of a salt-melting heating pipe of the three-sleeve pipe preheater; the inlet end of the square expansion bend and the inlet end of the salt-melting heating pipe are connected via a flange; and the outlet end of the square expansion bend passes through a pipe frame platform to be connected with the outlet end of the salt-melting heating pipe via a flange. According to the three-sleeve pipe preheater, as the square expansion bend is arranged between the inlet and the outlet of the salt-melting heating pipe of the three-sleeve pipe preheater, expansion space of a single outlet pipe of a salt-melting heating section of the three-sleeve pipe preheater can be eliminated, great axial expansion or contraction when temperature of the pipeline rises or falls can be avoided, the leakage problem at the flange connection place is solved, safety during the driving and stopping process and the production efficiency are improved.
Description
Technical field
The utility model relates to technical field of alumina production, particularly a kind of three cannula primary heaters.
Background technique
In recent years, three cannula primary heaters are because its efficient heat-exchange performance is widely used in the pressure digestion system of alumina producing Bayer process.The three cannula primary heater fused salt bringing-up section outer pipe single tube total lengths nearly 100 meters (as shown in Figure 1) that Chalco Chongqing Branch is used, design pressure 15.0MPa, material is 20# steel, nominal diameter DN300, nearly 275 ℃ of operating temperature.This pipeline integral installation is on without support bracket fastened pipe support, and since 2011 come into operation, opening at every turn, stopping all occurs leakage phenomenon.Through thinking and analysis repeatedly, while finding to open at every turn, stop, pipeline has larger axial displacement, be raised to approximately 275 ℃ or cool to normal temperature from 275 ℃ from normal temperature at every turn, when flange connections is maximum, can pull out the gap of upper millimeter, cause the automatic discharging of flange connections.The reason that above-mentioned leakage produces is, reaches the high pressure-temperature pipe thermal compensation deficiency of nearly 100 meters, axially significantly expands or shrink while causing pipeline heating and cooling, causes pipeline axial cross section stressed.
Model utility content
The problem of leaking because of the not enough caused flange connections of thermal compensation in order to solve high-temperature and pressure pipeline, the utility model provides a kind of three cannula primary heaters, the fused salt heating pipe of described three cannula primary heaters is provided with square expansible bend between importing and exporting, the entrance point of described square expansible bend is connected by flange with the entrance point of described fused salt heating pipe, and the outlet end of described square expansible bend is connected by flange with the outlet end of described fused salt heating pipe through pipe support platform.
Described square expansible bend is formed by three straight tubes system of simmering; Wherein, a straight tube is simmered into " U " shape structure, and other two straight tubes are simmered into bending; Weld respectively with the two ends of " U " shape pipe one end of two bending pipes, and other one end of two bending pipes is welded with respectively flange.
Three cannula primary heaters of the present utility model, between importing and exporting by the fused salt heating pipe at three cannula primary heaters, square expansible bend is set, eliminate the expansion space of three cannula primary heater fused salt bringing-up section outer pipe single tubes, thereby while having avoided pipeline heating and cooling, axially significantly expand or shrink, solved the leakage problem of flange connections, improved open, Security and the manufacturing efficiency of docking process.
Accompanying drawing explanation
Fig. 1 is the Placement schematic diagram that the fused salt heating pipe of existing three cannula primary heaters is imported and exported;
Fig. 2 is the Placement schematic diagram that the utility model embodiment increases the fused salt heating pipe import and export of square expansible bend;
Fig. 3 is the structural representation of the utility model embodiment's square expansible bend.
Embodiment
Below in conjunction with drawings and Examples, technical solutions of the utility model are further described.
Referring to Fig. 2, the utility model embodiment provides a kind of three cannula primary heaters, the fused salt heating pipe of this three cannula primary heater is provided with square expansible bend 1 between importing and exporting, the entrance point of square expansible bend 1 is connected by flange 3 with the entrance point of fused salt heating pipe, and the outlet end of square expansible bend 1 is connected by flange 4 with the outlet end of fused salt heating pipe through pipe support platform 2.
As shown in Figure 3, the square expansible bend 1 in the present embodiment is formed by three straight tubes system of simmering; Wherein, a straight tube is simmered into " U " shape structure, and other two straight tubes are simmered into bending; Weld respectively with the two ends of " U " shape pipe one end of two bending pipes, and other one end of two bending pipes is welded with respectively flange.Welding in square expansible bend processing adopts single face welding and double face shaping technique, mainly comprises following operation:
A) pipe feeding;
B) according to the difference of the thickness of pipe, material, groove opening;
C) carry out workpiece shape (as round as a ball etc.) processing;
D) workpiece spot welding docking, fixing;
E) CO
2weldering bottoming 1-2 layer;
CO
2weldering is with respect to manual welding, and it is more energy-conservation, efficient, and without slagging-off, welding quality is more easily controlled, and requires lower to welder's technical ability;
F) Lincoln weld capping or CO
2welding cap face;
G) carry out welding quality inspection (outward appearance, nondestructive inspection);
Employing said welding method has the following advantages:
1) welding efficiency is high: without carrying out back side slagging-off, back chipping, greatly reduced wlding and artificial use again;
2) weld appearance moulding is smooth evenly, fully guarantees reinforcement and appearance quality;
3) weld seam internal soundness is stable, can reach the requirement of I, II class weld seam;
4) reduction workman's labor intensity;
5) reduce the dependence to welder's technical ability, cut down finished cost;
6) saving power, as adopted CO
2welding by one side technique, can saving power more than 50%;
7) work efficiency of raising workpiece, shortens line duration;
8) without increasing expensive welding equipment; Manual welding or CO
2weldering all can;
9) overall cost (manually, wlding, the electricity charge etc.) is saved more than 50%.
In actual applications, the necessary annealed heat treatment of weld seam between square expansible bend and flange, to eliminate stress.Concrete heat treatment process is: workpiece receives → fixes the galvanic couple → insulation of heating plate/rope → stationary heat and wraps up → check each line → power transmission → heating → record → power-off → remove each line → dismounting thermocouple, heating plate/rope → hardness test → data to arrange.This heat treated advantage is to improve welded joint and be organized as the postweld heat treatment temperature of main purpose, has also eliminated welding residual stress simultaneously, prevents that brittle fracture lost efficacy.
The utility model embodiment's three cannula primary heaters, between importing and exporting by the fused salt heating pipe at three cannula primary heaters, square expansible bend is set, eliminate the expansion space of three cannula primary heater fused salt bringing-up section outer pipe single tubes, thereby while having avoided pipeline heating and cooling, axially significantly expand or shrink, solved the leakage problem of flange connections, improved open, Security and the manufacturing efficiency of docking process.
Above-described specific embodiment; the purpose of this utility model, technological scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (2)
1. a cannula primary heater, it is characterized in that, the fused salt heating pipe of described three cannula primary heaters is provided with square expansible bend between importing and exporting, the entrance point of described square expansible bend is connected by flange with the entrance point of described fused salt heating pipe, and the outlet end of described square expansible bend is connected by flange with the outlet end of described fused salt heating pipe through pipe support platform.
2. three cannula primary heaters as claimed in claim 1, is characterized in that, described square expansible bend is formed by three straight tubes system of simmering; Wherein, a straight tube is simmered into " U " shape structure, and other two straight tubes are simmered into bending; Weld respectively with the two ends of " U " shape pipe one end of two bending pipes, and other one end of two bending pipes is welded with respectively flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320520858.1U CN203594906U (en) | 2013-08-23 | 2013-08-23 | Three-sleeve pipe preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320520858.1U CN203594906U (en) | 2013-08-23 | 2013-08-23 | Three-sleeve pipe preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203594906U true CN203594906U (en) | 2014-05-14 |
Family
ID=50675795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320520858.1U Expired - Lifetime CN203594906U (en) | 2013-08-23 | 2013-08-23 | Three-sleeve pipe preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203594906U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623306A (en) * | 2022-03-17 | 2022-06-14 | 兰州新生科技有限责任公司 | Horizontal pipeline deformation compensation method based on rotary compensator |
-
2013
- 2013-08-23 CN CN201320520858.1U patent/CN203594906U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623306A (en) * | 2022-03-17 | 2022-06-14 | 兰州新生科技有限责任公司 | Horizontal pipeline deformation compensation method based on rotary compensator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140514 |