CN109505184B - Wide-width energy-saving steel drying cylinder for paper machine - Google Patents
Wide-width energy-saving steel drying cylinder for paper machine Download PDFInfo
- Publication number
- CN109505184B CN109505184B CN201811590153.0A CN201811590153A CN109505184B CN 109505184 B CN109505184 B CN 109505184B CN 201811590153 A CN201811590153 A CN 201811590153A CN 109505184 B CN109505184 B CN 109505184B
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- steel
- shell
- paper machine
- end cover
- width
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- 238000001035 drying Methods 0.000 title abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 23
- 238000009413 insulation Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/021—Construction of the cylinders
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a wide-width steel energy-saving drying cylinder for a paper machine, which is characterized in that a shell is formed by sequentially and coaxially connecting a plurality of sections of steel rings, each steel ring is made of a steel plate in a winding mode, axial welding seams are formed in the surface of each steel ring, and an included angle enabling the two adjacent steel rings to be staggered is formed between the axial welding seams of the two adjacent steel rings. According to the invention, through the mutual matching of steel, the turbulence bars, the siphoners, the heat insulation layers and the like, the surface temperature of the shell is increased by 6-10 degrees, the energy consumption is reduced by 5%, the heat efficiency is greatly improved, and the energy consumption is reduced.
Description
Technical field:
the invention belongs to the technical field of dryer structure improvement, and particularly relates to a wide-width steel energy-saving dryer for a paper machine.
The background technology is as follows:
the drying cylinders are the key components for paper drying, and most of the drying cylinders are made of cast iron materials, and the quantity of the drying cylinders accounts for about 2/3 of the total number of pressure vessels in the paper industry. The structure of the dryer is: the device comprises a shell, turbulent flow rods, siphons, end covers and shaft heads, wherein the two ends of the shell are respectively provided with one end cover, the shaft heads are arranged at the center of each end cover, channels for introducing saturated steam into the shell and channels communicated with the siphons arranged in the shell are arranged in the shaft heads, and a plurality of turbulent flow rods are axially arranged on the inner wall of the shell at intervals. When the paper dryer is used, saturated steam is introduced into the shell and condensed in the shell, the released heat enables the surface temperature of the shell to rise, paper coated on the surface of the outer wall of the shell to run is heated, and the paper is dried under the action of high temperature. With the development of science and technology, cast iron is gradually replaced by steel, the wall thickness of the cylinder body and the cylinder cover of the steel drying cylinder is greatly reduced, the quality is less than half of that of the cast iron drying cylinder, and the cost is greatly reduced. In practical application, the existing steel drying cylinder can be further optimized in the aspects of length, diameter, heat preservation, water resistance film and the like.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art and provide the wide-width steel energy-saving drying cylinder for the paper machine, which has a scientific and reasonable structure and improves the heat efficiency through welding optimization, heat preservation optimization and water film resistance optimization.
The technical scheme adopted by the invention is as follows:
the utility model provides an energy-conserving dryer of broad width steel for paper machine, includes casing, end cover and spindle nose, and the end cover is installed respectively at the casing both ends, and every end cover center department sets up spindle nose, its characterized in that: the shell is formed by sequentially coaxially connecting a plurality of sections of steel rings, each steel ring is made of coiled steel plates, axial welding seams are formed in the surface of each steel ring, and an included angle which enables two adjacent steel rings to be staggered is formed between the axial welding seams of the two adjacent steel rings.
Furthermore, the inner edge of the shell is provided with turbulence bars at intervals, an included angle is formed between each turbulence bar and the axis of the shell, and the value range of the included angle is 5-15 degrees.
And the diameter of the steel ring is 1.5-3 meters, and the width of the steel ring is more than or equal to 8 meters.
And 10-50 turbulence bars are uniformly distributed and fixed on the inner wall of the shell in the radial direction, and the turbulence bars are made of aluminum materials, copper materials or steel materials.
The cross-sectional dimension of the turbulence bar is 40×50 square millimeters.
The wall thickness of the steel ring is 23-25 mm.
Furthermore, the outer side ends of the two steel rings positioned at the two sides are provided with overhanging edges which integrally extend to the outer side of the end cover,
and a plurality of rib plates are arranged on the outer side end face of the end cover, an insulation board is filled between two adjacent rib plates, a cover plate is buckled on two adjacent rib plates, the side edges of the two adjacent cover plates are contacted, the outer edge of each cover plate is contacted with the outer extending edge, and the inner edge of each cover plate is contacted with the outer edge of the shaft head.
And a concave ring is arranged on the inner wall of the shell close to the outward extending edge, a bulge arranged in alignment of the end cover is clamped on the outward end face of the concave ring, the outer edges of the end covers on two sides of the bulge are arranged to be wedge-shaped bevel edges, and the two wedge-shaped bevel edges are welded and fixed with the inner walls of the shell on two sides of the concave ring respectively.
And the width of the welding lines at the two sides of the end cover is larger than 1-1.5 times of the thickness of the shell, and the opening angle of the welding lines at the two sides of the end cover is 40-50 degrees.
The invention has the technical effects that:
in the invention, the shell is composed of a plurality of steel rings which are welded in turn, a certain included angle is formed between welding seams of two adjacent steel rings, so that the integral strength is improved, in addition, different numbers of turbulence bars are arranged according to the difference of the diameters of the shells, the condensation water film formed when the shells rotate at high speed is blocked, a fixed siphon or a rotary siphon can be arranged in the shells, the influence of condensation water on the surface temperature of the shells is further reduced, the heat transfer is improved, and the heat dissipation at the end covers is greatly reduced by arranging heat insulation layers on the outer surfaces of the end covers at the two ends of the shells, so that the heat is concentrated at the shells, the surface temperature of the shells is improved by 6-10 degrees through the mutual cooperation of steel, the turbulence bars, the siphon, the heat insulation layers and the like, the heat efficiency is greatly improved, and the energy consumption is reduced by 5%.
Description of the drawings:
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is an enlarged axial view of FIG. 1 with the end cap removed;
fig. 3 is an enlarged view of section I of fig. 2;
FIG. 4 is a schematic view of the condensate water film when rotated clockwise in FIG. 1;
FIG. 5 is an enlarged view of section II of FIG. 4;
FIG. 6 is a schematic diagram of a stationary syphon;
FIG. 7 is a schematic diagram of a rotary siphon;
FIG. 8 is a schematic view of the structure of the end cap to housing weld;
FIG. 9 is an enlarged view of section III of FIG. 8;
FIG. 10 is a schematic view of an end cap with ribs and insulation;
FIG. 11 is a schematic view of the set cover plate of FIG. 10;
FIG. 12 is a view in the A direction of FIG. 4;
fig. 13 is a B-direction view of fig. 4.
The specific embodiment is as follows:
the invention will now be further illustrated by reference to the following examples, which are intended to be illustrative, not limiting, and are not intended to limit the scope of the invention.
The invention discloses a wide-width steel energy-saving drying cylinder for a paper machine, which is shown in figures 1-11 and comprises a shell, an end cover 17, a shaft head 11, vortex bars 13 and a siphon 18, wherein the end covers are respectively arranged at two ends of the shell, the shaft head is arranged at the center of the end cover, a plurality of vortex bars are uniformly distributed on the surface of the inner wall of the shell in the radial direction, and the siphon is arranged in the shell, and the innovation of the invention is that: the shell is formed by sequentially welding 7 of a plurality of sections of steel rings 5, 6, 8 and 9, each steel ring is formed by winding a steel plate 4, the surface of each steel ring is provided with an axial welding line 3, and an included angle beta which enables two adjacent steel rings to be staggered is formed between the axial welding lines of the two adjacent steel rings.
In this embodiment, if the axial weld joints all affect the overall strength on a straight line, so adjacent axial directions have a certain included angle, and when the housing is longer, the included angle also avoids the problem that some two weld joints are still located on the same straight line, and the above β is 30-50 degrees, that is: the projection point of any point of two adjacent axial weld joints at the joint of the weld 7 and the central angle of the circle where the joint is positioned are 30-50 degrees.
The steel ring is manufactured by winding and welding a Q345R steel plate. The saturated steam line and the drain line may pass through the space 12 in the stub shaft and into the interior of the housing.
The diameter of the steel ring is 1.5-3 m, the total width of all steel rings after assembly is 8-10 m, and the total width of more than ten m is also possible, and the specific width is determined according to the production requirement.
Because the shell is large in size, the amount of condensed water generated in the operation of the drying cylinder is large, and researches show that the drying cylinder with the diameter of 1.5 meters forms a water film at the speed of 500m/min, and the thermal resistance of the water film is about 40 times of that of a steel medium, so that the surface temperature of the shell can be greatly reduced. For this purpose, a turbulence bar is arranged in the housing from the vicinity of one end cap to the vicinity of the other end cap, in particular: 10-50 turbulent flow bars are radially and uniformly distributed on the inner wall of the assembled steel ring, the surface of each turbulent flow bar, which is attached to the inner wall of the shell, is in an outwards convex arc shape matched with the inner wall of the shell, so that the two are connected more tightly, the two sides of each turbulent flow bar are fixed through welding 14, and the cross section size of each turbulent flow bar is 40 multiplied by 60 square millimeters. Besides the welding and fixing mode, a clamp can be arranged on the inner wall of the shell in advance, and then the clamp is used for fixing the spoiler on the inner wall of the shell.
The number and the size of the turbulence bars are selected based on the principle that the accumulated condensed water 15 does not overflow, for example: the diameter is 1800 mm series, the number of the turbulence bars is 24-30, the width of the turbulence bars is 49mm, and the height is 59mm; the number of the turbulence bars of the wide drying cylinder with the diameter of 3 meters is 35-40, and the average temperature of the surface of the shell can be increased by 6-10 ℃ through the arrangement of the turbulence bars, so that the heat efficiency is improved, and the energy-saving effect is achieved.
The turbulent flow rod is made of solid heat conducting materials, such as corrosion-resistant aluminum materials, copper materials, steel materials and the like, and is determined according to the strength, the rigidity and the heat transfer performance of the wide drying cylinder, such as: when the width of the shell reaches more than 9 meters, a steel turbulence bar is selected. The turbulent flow rod can reduce the formation of water film and raise the mechanical strength of the casing.
The more preferable scheme is as follows: the spoiler bars are arranged in an inclined state, i.e. each spoiler bar has an angle with the projection of the axis of the shell of the drying cylinder on the shell at the spoiler bar. The specific structure is shown in fig. 12 and 13:
in fig. 12, the projection of the housing axis onto the housing at the spoiler bar is 29, which forms an angle of 5 to 15 degrees with the spoiler bar, in the drawing, 15 degrees. The condensate 15 is accumulated on one side of the spoiler bar 13, and as the spoiler bar is in the upward direction of movement in the drawing (see a of the clockwise-rotating housing in fig. 4), the condensate flows to the right along the inclined spoiler bar, and when it reaches the vicinity of the right end cap, the condensate is collected and discharged by the siphon thereof.
In fig. 13, unlike fig. 12, the direction in which the spoiler bar moves downward (see B of the clockwise rotating housing in fig. 4), so that condensed water is accumulated on the other side of the spoiler bar and flows to the left side, and when it reaches the vicinity of the left end cap, the condensed water is collected and discharged by the siphon thereof.
The advantage of the structure of the inclined arrangement of the spoiler bars of fig. 12, 13 is that: through fluid motion theory analysis, the transverse flow speed of the condensed water and the oblique volumetric force load of the condensed water are increased due to the inclined turbulent flow rod, and when the drying cylinder runs at a high speed, the condensed water rapidly flows to the siphon, so that the siphon effect of condensed water discharge can be improved by 10-20%.
The wall thickness of the steel ring is 23-25 mm, and compared with 28-30 mm of the wall thickness of cast iron, the steel ring has lighter weight and higher strength. Compared with the cast iron drying cylinder with the same size, the weight of the steel drying cylinder with different sizes is reduced by 2-4 tons, the weight is reduced by 10-15%, and the materials are saved.
The siphon should be selected according to the movement condition of condensed water, a fixed siphon as shown in fig. 6 can be selected for low-speed and non-formed water ring, and a rotary siphon as shown in fig. 7 can be selected for high-speed running drying cylinder, i.e. formed water ring. The siphon may be provided only at one end cap or both end caps, and it is of course necessary to provide the siphon at both end caps in order to match the structure shown in fig. 12 and 13.
As shown in fig. 8 and 9, the outer ends of the two steel rings on both sides are provided with overhanging edges 16 which integrally extend to the outer side of the end cover, and the axial width of the overhanging edges is 30-50 mm. An end cover is arranged at the integral joint of the overhanging edge and the shell, and the installation structure of the end cover is as follows: the inner wall of the shell close to the overhanging edge is provided with a concave ring 26, the outward end face of the concave ring is clamped with a protrusion 25 arranged in an aligned manner of the end cover, the outer edges of the end covers on two sides of the protrusion are provided with wedge-shaped bevel edges 27, and the two wedge-shaped bevel edges are respectively welded 21 and 22 with the inner walls of the shell on two sides of the concave ring to be fixed. The width f of the welding lines on both sides of the end cover is larger than 1 to 1.5 times of the thickness delta c of the shell, and the opening angle of the welding lines on both sides of the end cover is 40 to 50 degrees, preferably 45 degrees. The width of the welding line and the opening angle meet the relevant regulations of the specification GB 150 steel pressure vessel, and the mutual matching of the welding line, the concave ring and the convex at the two sides can solve the problem of a high stress area at the joint of the end cover and the shell.
The outer end face of the end cover is provided with a plurality of rib plates 28, an insulation board 23 is filled between two adjacent rib plates, the insulation board is provided with an outer frame 20, and the outer frame and a rock wool or ultra-fine glass wool layer therein are jointly stuck on the outer end face of the end cover. Two adjacent rib plates are buckled with a cover plate 2, two adjacent cover plate side edges 1 are contacted, the outer edge of each cover plate is embedded into a concave 19 formed on the outer side end face of the overhanging edge, the inner edge of each cover plate is contacted with the outer edge of the shaft head, and the cover plate is fixed with the rib plate through a small bolt 10. The rib plates can be made of steel plates or channel steel, the number of vertical beams is eight, the number of heat insulation plates is also eight, and the cover plate is made of thin steel plates, and the inner side surfaces 24 of the thin steel plates are in close contact with heat insulation materials in the heat insulation plates. Through the setting of heated board, reduced the heat dissipation of end cover department, can reduce 5% heat loss at least.
In order to ensure the hardness and the smoothness of the surface of the drying cylinder, the surface is processed after the drying cylinder is installed, firstly, the surface is finished on a machine tool, the surface coating is carried out, the coating method has two schemes, the chromium coating is plated by barrel plating or slot plating, high chromium can be thermally sprayed, and grinding processing is carried out after the chromium plating or high chromium thermal spraying, so as to ensure the uniformity and the gloss of the surface of the drying cylinder.
In the invention, the shell is composed of a plurality of steel rings which are welded in turn, a certain included angle is formed between welding seams of two adjacent steel rings, so that the integral strength is improved, in addition, different numbers of turbulence bars are arranged according to the difference of the diameters of the shells, especially, a condensate water film formed when the shells rotate at high speed is blocked, a fixed siphon or a rotary siphon can be arranged in the shells, the influence of condensate water on the surface temperature of the shells is further reduced, the heat transfer is improved, and the heat dissipation at the end covers is greatly reduced by arranging heat insulation layers on the outer surfaces of the end covers at the two ends of the shells, so that the heat is concentrated at the shells, and the temperature of the surfaces of the shells is improved by 6-7 degrees through the mutual cooperation of steel, the turbulence bars, the siphon, the heat insulation layers and the like, so that the heat efficiency is greatly improved, and the energy consumption is reduced by 5%.
Claims (7)
1. The utility model provides an energy-conserving dryer of broad width steel for paper machine, includes casing, end cover and spindle nose, and the end cover is installed respectively at the casing both ends, and every end cover center department sets up spindle nose, its characterized in that: the shell is formed by sequentially and coaxially connecting a plurality of sections of steel rings, each steel ring is made of coiled steel plates, axial welding seams are arranged on the surfaces of the steel rings, and an included angle which enables the two adjacent steel rings to be staggered is formed between the axial welding seams of the two adjacent steel rings;
the inner edge of the shell is provided with turbulence bars at intervals, an included angle is formed between each turbulence bar and the axis of the shell, and the value range of the included angle is 5-15 degrees; 10-50 turbulence bars are uniformly distributed and fixed on the inner wall of the shell in the radial direction, and the turbulence bars are made of aluminum materials, copper materials or steel materials; the cross section size of the turbulence bar is 40 multiplied by 60 square millimeters;
the structure that the vortex bar is obliquely arranged increases the transverse flow speed of the condensed water, and when the dryer runs at a high speed, the condensed water rapidly flows to the siphon, so that the siphon effect of condensed water discharge is improved by 10-20%.
2. A wide width steel energy saving dryer for paper machine according to claim 1, characterized in that: the diameter of the steel ring is 1.5-3 meters, and the width is more than or equal to 8 meters.
3. A wide width steel energy saving dryer for paper machine according to claim 1, characterized in that: the wall thickness of the steel ring is 23-25 mm.
4. A wide-width steel energy-saving dryer for paper machines according to claim 1 or 2 or 3, characterized in that: the outer side ends of the two steel rings positioned at the two sides are provided with overhanging edges which integrally extend to the outer side of the end cover.
5. A wide width steel energy saving dryer for paper machine as claimed in claim 4, characterized in that: the end face outside the end cover is provided with a plurality of rib plates, an insulation board is filled between two adjacent rib plates, a cover plate is buckled on two adjacent rib plates, the side edges of two adjacent cover plates are contacted, the outer edge of each cover plate is contacted with the outer extending edge, and the inner edge of each cover plate is contacted with the outer edge of the shaft head.
6. A wide width steel energy saving dryer for paper machine as claimed in claim 5, characterized in that: the shell is provided with a concave ring on the inner wall close to the overhanging edge, the outward end face of the concave ring is clamped with a bulge arranged in an alignment way, the outer edges of the end covers on two sides of the bulge are provided with wedge-shaped bevel edges, and the two wedge-shaped bevel edges are welded and fixed with the inner walls of the shell on two sides of the concave ring respectively.
7. A wide width steel energy saving dryer for paper machine as claimed in claim 6, characterized in that: the width of the welding lines on two sides of the end cover is larger than 1-1.5 times of the thickness of the shell, and the opening angle of the welding lines on two sides of the end cover is 40-50 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590153.0A CN109505184B (en) | 2018-12-25 | 2018-12-25 | Wide-width energy-saving steel drying cylinder for paper machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590153.0A CN109505184B (en) | 2018-12-25 | 2018-12-25 | Wide-width energy-saving steel drying cylinder for paper machine |
Publications (2)
| Publication Number | Publication Date |
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| CN109505184A CN109505184A (en) | 2019-03-22 |
| CN109505184B true CN109505184B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811590153.0A Active CN109505184B (en) | 2018-12-25 | 2018-12-25 | Wide-width energy-saving steel drying cylinder for paper machine |
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| CN111001960B (en) * | 2019-12-18 | 2021-06-11 | 安德里茨（中国）有限公司 | Yankee cylinder section pre-processing piece and method for manufacturing Yankee cylinder |
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| CN109505184A (en) | 2019-03-22 |
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