CN114059833A - Construction method for lining stainless steel of pulp tower of pulp mill - Google Patents
Construction method for lining stainless steel of pulp tower of pulp mill Download PDFInfo
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- CN114059833A CN114059833A CN202111283885.7A CN202111283885A CN114059833A CN 114059833 A CN114059833 A CN 114059833A CN 202111283885 A CN202111283885 A CN 202111283885A CN 114059833 A CN114059833 A CN 114059833A
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 104
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 104
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 118
- 238000000034 method Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 23
- 239000010962 carbon steel Substances 0.000 claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 12
- 238000005452 bending Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005554 pickling Methods 0.000 claims description 13
- 230000007547 defect Effects 0.000 claims description 10
- 238000002161 passivation Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000012958 reprocessing Methods 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
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- 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
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
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- 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
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
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- 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
- E04H12/22—Sockets or holders for poles or posts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a construction method of stainless steel lining of a pulp tower of a pulp mill, relating to the field of pulp towers, and the technical scheme comprises the following steps: the method comprises the following steps: preparation of a lining stainless steel plate: firstly, drilling and plugging a welding hole, then, carrying out arc pressing on the stainless steel plate by using a plate bending machine, and simultaneously preparing a welding material and a welding tool; step two: a group of people construct the pulp tower cup seat at the pulp tower position by adopting a forward installation method, and after the cone is integrally finished, the cone is lined with stainless steel from top to bottom; step three: another a set of people sets up the construction platform and parallel construction barrel first section festival with the flip-chip method near the thick liquid tower on the open space, inside lining stainless steel and the synchronous construction of carbon steel shell ring flip-chip, adopt every lining good round in the gas tightness experiment, just carry out the gas tightness test, can realize the detection to the gas tightness of every circle of stainless steel like this, reduce follow-up time of reprocessing, and carry out whole acceptance check to the result of inside lining stainless steel construction through gas tightness test report and water filling test report, be convenient for accept the inside lining stainless steel of thick liquid tower.
Description
Technical Field
The invention relates to the technical field of pulp towers, in particular to a construction method of a pulp tower lining stainless steel of a pulp mill.
Background
The construction of the inside lining stainless steel of the pulp tower of the pulp mill has different construction methods, such as: some adopt 'integral inversion'; some tower bases are constructed by adopting a positive installation method (the shape of an upper cone and a lower cylinder is similar to that of a cup, the whole is also called as the cup base, namely the lower part is the same), a platform is erected on the cup base, and then the platform is inversely installed to complete the construction of the tower body; after the whole construction of some slurry towers is finished, a scaffold construction lining is built in the slurry tower; some carbon steel cylinder sections are constructed by adopting sectional sections, frames are built in the sections, and stainless steel is lined from top to bottom.
However, the traditional construction method for lining stainless steel of the pulp tower of the pulp mill needs to be constructed step by step in actual work, so that the construction progress is slow, and effective acceptance of the lined stainless steel pulp tower is lacked, so that the construction method for lining the stainless steel of the pulp tower of the pulp mill is needed.
Disclosure of Invention
The invention aims to solve the defect that construction needs to be carried out step by step in the process of carrying out the stainless steel lining of the pulp tower in the prior art, so that the construction progress is relatively slow, and provides a construction method of the stainless steel lining of the pulp tower in a pulp mill.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method of a pulp tower lining stainless steel of a pulp mill comprises the following steps:
the method comprises the following steps: preparation of a lining stainless steel plate: firstly, drilling and plugging a welding hole, then, carrying out arc pressing on the stainless steel plate by using a plate bending machine, and simultaneously preparing a welding material and a welding tool;
step two: a group of people construct the pulp tower cup seat at the pulp tower position by adopting a forward installation method, and after the cone is integrally finished, the cone is lined with stainless steel from top to bottom;
step three: another group of people build a construction platform on the open ground near the slurry tower and parallelly construct a first section of a cylinder by an inverted installation method, the lining stainless steel and the carbon steel cylinder section are inverted and constructed synchronously, then the finished first section is assembled with the finished cup seat, meanwhile, a second section is constructed on the empty platform in parallel, the process is circulated, the nth section is constructed on the platform while the nth-1 section is assembled on the tower seat, the last section is firstly jacked, then lifted and inverted, and the nth section with the top is assembled;
step four: and carrying out integral pickling passivation and water filling tests on the slurry tower, and carrying out integral acceptance on the construction result of the lining stainless steel according to the air tightness test report and the water filling test report.
The above technical solution further comprises:
the length of the section is determined by several circles of steel plates according to the field hoisting capacity and the field conditions, namely the section is made as long as possible, so that the splicing times of the sections and the high-altitude operation amount are reduced.
The lining stainless steel adopts a sample plate to detect (the radian of the sample plate is consistent with that of the inner wall of the lined cylinder), in order to prevent carburization, the roller surface of the plate bending machine is wrapped by a rubber sleeve during arc pressing, carbon steel scribes cannot be used for scribing, and slings are used for hoisting and carrying.
The stainless steel lining is welded by argon arc welding, the transition welding wire is a TFW309L welding wire to dilute elements and generate a transition phase, so that the components and tissues between the stainless steel lining and the cylinder are fully transited, and meanwhile, the stainless steel lining and the cylinder generate strong adhesive force, and the surface is covered by the TFW316L welding wire.
The object to be lined is required to be qualified in detection of welding seams before the stainless steel is lined, and the inner surface of the object to be lined is polished and cleaned so as to ensure that the lining stainless steel plate is tightly attached to the carbon steel.
The plug welding hole is welded by dissimilar steel, the inner lining vertical welding line consists of an intermittent welding line and an overlap welding line, and the intermittent welding line (the length of the welding line is 80mm, the interval is 100mm, and the interval is reserved from the bottom of each circle, namely all vertical welding intermittent welding lines are ensured not to be welded by 100mm near the bottom of each circle;
the lap weld (the subsequent lined stainless steel plate is lap welded across the interrupted weld with the interrupted lined stainless steel) is continuously full welded directly with TFW316L welding wire.
Welding of the lining ring: the circumferential weld between each circle of lining stainless steel plate and each circle of carbon steel plate is an I-shaped shimming butt weld, a weld gap of 1-2 mm is reserved between two butted stainless steel lining plates, the stainless steel plate is welded on the carbon steel plate of the cylinder body by using a TFW309L welding wire, and then the lining stainless steel plate is subjected to butt welding and cover surface welding by using a TFW316L welding wire. In order to avoid the communication between the upper circle and the lower circle, the butt welding seam is full welding.
In the air-tight test, each circle of lining is performed, firstly, soapy water is coated on a welding line and a plug welding hole, a pressure is applied between the lining and the cylinder body to 2.5Kpa by using an air pump, the pressure is maintained for 20-30 min, the change of air pressure and the leakage of the welding line are observed in the period, and if the pressure is kept constant, the lining and the plug welding effect are good; if leakage and pressure drop occur, the defect position should be searched and marked in time, then the cause of defect generation should be found out, and after each circle of airtight test, the detected defect should be repaired. After the repair work is finished, the air tightness test is carried out again until the repair work is qualified.
In order to play a role in corrosion resistance in the whole pickling passivation treatment, the pickling passivation treatment is integrally carried out on the lining welding part by adopting pickling paste.
After the acid cleaning is finished, the water with the temperature not lower than 5 ℃ and the chloride ion content less than 25mg/L is used for carrying out the integral water filling test on the equipment, and water is added to the overflow port of the equipment. Keeping the water-filled state for 48 h. The tank wall has no leakage and abnormal deformation, and is qualified. If water flows out from the M10 screw hole on the outer cylinder, the water flow rate is as follows: the ring of stainless steel lining at the elevation and above corresponding positions is leaked and should be repaired.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, a group of people construct a pulp tower cup seat at the pulp tower position by adopting a forward installation method, and after the cone is integrally finished, the cone is lined with stainless steel from top to bottom; another group people builds the construction platform and uses the first section of a barrel of parallel construction of flip-chip method near the thick liquid tower on the open ground, inside lining stainless steel and the synchronous construction of carbon steel shell ring flip-chip, then will make the first section of a section of will be done, then, will be done, and the section of a section of the section of a section of the.
2. According to the invention, the air tightness test is carried out after each circle of lining is adopted in the air tightness test, so that the air tightness of each circle of stainless steel can be detected, the subsequent repair time is reduced, the integral acceptance of the construction result of the lining stainless steel is carried out through the air tightness test report and the water filling test report, and the acceptance of the lining stainless steel of the pulp tower is facilitated.
Drawings
FIG. 1 is a schematic view of welding a carbon steel cylinder and a stainless steel plate in a construction method of a pulp tower lining stainless steel in a pulp mill according to the present invention; .
In the figure: 1. a carbon steel cylinder; 2. a stainless steel plate; 3. plug welding; 4. a full weld; 5. welding off; 6. and (6) overlapping.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.
Example one
As shown in FIG. 1, the construction method of the pulp tower lining stainless steel in the pulp mill provided by the invention comprises the following steps:
the method comprises the following steps: preparation of a lining stainless steel plate: firstly, drilling and plugging a welding hole, then, carrying out arc pressing on the stainless steel plate by using a plate bending machine, and simultaneously preparing a welding material and a welding tool;
step two: a group of people construct the pulp tower cup seat at the pulp tower position by adopting a forward installation method, and after the cone is integrally finished, the cone is lined with stainless steel from top to bottom;
step three: another group of people build a construction platform on the open ground near the slurry tower and parallelly construct a first section of a cylinder by an inverted installation method, the lining stainless steel and the carbon steel cylinder section are inverted and constructed synchronously, then the finished first section is assembled with the finished cup seat, meanwhile, a second section is constructed on the empty platform in parallel, the process is circulated, the nth section is constructed on the platform while the nth-1 section is assembled on the tower seat, the last section is firstly jacked, then lifted and inverted, and the nth section with the top is assembled;
step four: carrying out integral pickling passivation and water filling tests on the slurry tower, and carrying out integral acceptance on the construction result of the lining stainless steel according to the air tightness test report and the water filling test report;
the length of the section is specifically composed of a plurality of circles of steel plates, and the section is determined as long as possible according to the field hoisting capacity and the field conditions so as to reduce the splicing times of the sections and the high-altitude operation amount;
in order to ensure the accuracy of the radian, a template detection is adopted (the radian of the template is consistent with the radian of the inner wall of the lined cylinder body), in order to prevent carburization, the roller surface of the plate bending machine is wrapped by a rubber sleeve during arc pressing, carbon steel scribes cannot be used for marking, and slings are used for lifting and carrying;
the stainless steel lining is welded by argon arc welding, the transition welding wire is a TFW309L welding wire to dilute elements and generate a transition phase, so that the components and tissues between the stainless steel lining and the cylinder are fully transited, and meanwhile, a strong adhesive force is generated between the stainless steel lining and the cylinder, and the surface of the stainless steel lining and the cylinder is covered by the TFW316L welding wire;
meanwhile, the welding seam of the object to be lined is qualified after being detected before the stainless steel is lined, and the inner surface of the object to be lined is polished and cleaned to ensure that the lining stainless steel plate is tightly attached to the carbon steel;
the plug welding hole is welded by dissimilar steel, the inner lining vertical welding line consists of an intermittent welding line and an overlap welding line, and the intermittent welding line (the length of the welding line is 80mm, the interval is 100mm, and the interval is reserved from the bottom of each circle, namely all vertical welding intermittent welding lines are ensured not to be welded by 100mm near the bottom of each circle;
the lap weld (the back lining stainless steel plate strides over the intermittent weld and carries out lap welding with the welded lining stainless steel) is directly carried out continuous full welding by using a TFW316L welding wire;
welding of the lining ring: the circumferential weld between each circle of lining stainless steel plate and each circle of carbon steel plate is an I-shaped shimming butt weld, a weld gap of 1-2 mm is reserved between two butted stainless steel lining plates, the stainless steel plate is welded on the carbon steel plate of the cylinder body by using a TFW309L welding wire, and then the lining stainless steel plate is subjected to butt welding and cover surface welding by using a TFW316L welding wire. In order to avoid the communication between the upper circle and the lower circle, the butt welding seam is full welding.
The construction method of the pulp tower lining stainless steel based on the embodiment is characterized in that during operation, firstly, a lining stainless steel plate is prepared, plug welding holes are drilled in the stainless steel plate (firstly, the stainless steel plate is scribed and drilled with the plug welding holes with the diameter of 6mm, the distance from the edge is 150mm, and the hole distance is 300mm), then, a plate bending machine is used for pressing the stainless steel plate to form an arc, in order to ensure the accuracy of the arc, a sample plate is adopted for detection (the radian of the sample plate is consistent with the radian of the inner wall of a lined cylinder body), in order to prevent carburization, the roller surface of the plate bending machine is wrapped by a rubber sleeve during arc pressing, the scribing cannot be performed by a carbon steel scribing needle, a hanging strip is used for hoisting and carrying, and meanwhile, a welding material and a welding tool are prepared;
the plug welding hole is welded by dissimilar steel, a lining vertical welding line in the plug welding hole consists of an intermittent welding line and an overlap welding line, the intermittent welding line (the length of the welding line is 80mm, the interval is 100mm, the interval is reserved from the bottom of each circle, namely all the intermittent welding lines of the vertical welding are ensured not to be welded by 100mm of the bottom of each circle, the position of each circle of leakage detecting hole cannot be overlapped with the vertical welding line, the overlap joint 6 of two stainless steel plates 2 needs to be welded during welding, the welding position is marked as a full-weld position 4, the cylinder body 1 and the stainless steel plates 2 are welded through the plug welding hole during welding carbon steel, the welding position is marked as a plug-weld position 3, the inner overlapping positions of the two stainless steel plates 2 are welded through broken welding, and the welding position is marked as a full-weld position 4;
one group of people construct the cup seat of the pulp tower by adopting a positive installation method at the position of the pulp tower, and after the cone is integrally finished, the cone is lined with stainless steel from top to bottom, the other group of people build a construction platform on the open ground near the pulp tower and construct a first section of a cylinder body in parallel by using a reverse installation method, the lined stainless steel and a carbon steel cylinder section are reversely installed for synchronous construction, then the manufactured first section is assembled with the finished cup seat, a second section is constructed on the empty platform in parallel, the circulation is carried out, when the tower seat is assembled to the (n-1) th section, the nth section is constructed on the platform, the last section is firstly jacked, then the reverse installation is lifted, and the nth section with the top is assembled;
the stainless steel lining is welded by argon arc welding, the transition welding wire is a TFW309L welding wire to dilute elements and generate a transition phase, so that the components and tissues between the stainless steel lining and the cylinder are fully transited, and meanwhile, the stainless steel lining and the cylinder generate strong adhesive force, and the surface is covered by the TFW316L welding wire.
Example two
As shown in fig. 1, based on the first embodiment, in the air-tight test, the air-tight test is performed every time when the liner is lined for one circle, soap water is firstly coated on the welding line and the plug welding hole, the pressure between the liner and the cylinder body is increased to 2.5Kpa by using an air pump, the pressure is maintained for 20-30 min, the change of air pressure and the existence of leakage of the welding line are observed in the period, and if the pressure is kept constant, the good effect of the plug welding and the liner is proved; if leakage and pressure drop occur, the defect position should be searched and marked in time, then the cause of defect generation should be found out, and after each circle of airtight test, the detected defect should be repaired. After the repairing work is finished, performing the air tightness test again until the air tightness test is qualified;
in order to play a role in corrosion resistance in the integral pickling passivation treatment, pickling passivation treatment is integrally carried out on the lining welding part by adopting pickling paste;
after the acid cleaning is finished, the water with the temperature not lower than 5 ℃ and the chloride ion content less than 25mg/L is used for carrying out the integral water filling test on the equipment, and water is added to the overflow port of the equipment. Keeping the water-filled state for 48 h. The tank wall has no leakage and abnormal deformation, and is qualified. If water flows out from the M10 screw hole on the outer cylinder, the water flow rate is as follows: the ring of stainless steel lining at the elevation and above corresponding positions is leaked and should be repaired.
Design like this in this embodiment, at the during operation, every lining the stainless steel board the round just carry out the sealing test, detect the gas tightness of inside lining stainless steel to can realize the detection to the gas tightness of every circle of stainless steel, reduce follow-up time of reprocessing.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A construction method for stainless steel lining of a pulp tower of a pulp mill is characterized by comprising the following steps:
the method comprises the following steps: preparation of a lining stainless steel plate: firstly, drilling and plugging a welding hole, then, carrying out arc pressing on the stainless steel plate by using a plate bending machine, and simultaneously preparing a welding material and a welding tool;
step two: a group of people construct the pulp tower cup seat at the pulp tower position by adopting a forward installation method, and after the cone is integrally finished, the cone is lined with stainless steel from top to bottom;
step three: another group of people build a construction platform on the open ground near the slurry tower and parallelly construct a first section of a cylinder by an inverted installation method, the lining stainless steel and the carbon steel cylinder section are inverted and constructed synchronously, then the finished first section is assembled with the finished cup seat, meanwhile, a second section is constructed on the empty platform in parallel, the process is circulated, the nth section is constructed on the platform while the nth-1 section is assembled on the tower seat, the last section is firstly jacked, then lifted and inverted, and the nth section with the top is assembled;
step four: and carrying out integral pickling passivation and water filling tests on the slurry tower, and carrying out integral acceptance on the construction result of the lining stainless steel according to the air tightness test report and the water filling test report.
2. The method as claimed in claim 1, wherein the length of the segments is made up of several rings of steel plates, and the segments are made as long as possible according to the on-site hoisting capacity and on-site conditions, so as to reduce the number of segments to be spliced and the amount of overhead work.
3. The method as claimed in claim 2, wherein the lining stainless steel is manufactured by using a template (the radian of the template is consistent with the radian of the inner wall of the lined cylinder), and the roller surface of the plate bending machine is wrapped by a rubber sleeve during arc pressing for preventing carburization, and the lining cannot be scribed by a carbon steel scriber, and a sling is used for lifting and carrying.
4. The method as claimed in claim 3, wherein the stainless steel lining is welded by argon arc welding, and the transition welding wire is TFW309L welding wire to dilute the elements and generate transition phase, so that the components and structure between the stainless steel lining and the cylinder are fully transited, and the stainless steel lining and the cylinder are covered by TFW316L welding wire.
5. The method as claimed in claim 4, wherein the object to be lined is qualified by inspection of the weld before the stainless steel is lined, and the inner surface is polished to ensure the stainless steel lining plate is tightly adhered to the carbon steel.
6. The method for constructing the stainless steel lining of the pulp tower of the pulp mill according to claim 5, wherein the plug welding hole is welded by dissimilar steel, the vertical welding line of the lining consists of an intermittent welding line and a lap welding line, the intermittent welding line (the length of the welding line is 80mm, the interval is 100mm, the interval is left from the bottom of each circle, that is, all the intermittent welding lines of the vertical welding are ensured not to be welded by 100mm of the bottom of each circle, and the position of each circle of the leakage detecting hole cannot be overlapped with the vertical welding line;
the lap weld (the subsequent lined stainless steel plate is lap welded across the interrupted weld with the interrupted lined stainless steel) is continuously full welded directly with TFW316L welding wire.
7. The method of constructing a pulp mill tower lining of stainless steel as claimed in claim 6, wherein the lining girth weld: the circumferential weld between each circle of lining stainless steel plate and each circle of carbon steel plate is an I-shaped shimming butt weld, a weld gap of 1-2 mm is reserved between two butted stainless steel lining plates, the stainless steel plate is welded on the carbon steel plate of the cylinder body by using a TFW309L welding wire, and then the lining stainless steel plate is subjected to butt welding and cover surface welding by using a TFW316L welding wire. In order to avoid the communication between the upper circle and the lower circle, the butt welding seam is full welding.
8. The method for constructing the stainless steel lining of the pulp tower of the pulp mill according to claim 7, wherein the air-tight test is carried out every time when the stainless steel lining is formed for one circle in the air-tight test, soapy water is coated on a welding line and a plug welding hole, the pressure between the lining and a cylinder body is pressed to 2.5Kpa by using an air pump, the pressure is maintained for 20-30 min, the change of air pressure and the leakage of the welding line are observed in the process, and if the pressure is kept constant, the lining and the plug welding effect are good; if leakage and pressure drop occur, the defect position should be searched and marked in time, then the cause of defect generation should be found out, and after each circle of airtight test, the detected defect should be repaired. After the repair work is finished, the air tightness test is carried out again until the repair work is qualified.
9. The method as claimed in claim 8, wherein the stainless steel lining of the pulp tower is subjected to acid pickling and passivation at the welded portion of the lining by using acid pickling paste to achieve corrosion resistance during the acid pickling and passivation.
10. The method as claimed in claim 9, wherein after pickling, the apparatus is subjected to a bulk water filling test with water at a temperature of not less than 5 ℃ and a chloride ion content of less than 25mg/L, and water is added to the overflow port of the apparatus. Keeping the water-filled state for 48 h. The tank wall has no leakage and abnormal deformation, and is qualified. If water flows out from the M10 screw hole on the outer cylinder, the water flow rate is as follows: the ring of stainless steel lining at the elevation and above corresponding positions is leaked and should be repaired.
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