CN113639257A - Mosaic structure for eliminating internal stress of tube panel of waste heat boiler same-rejection system module - Google Patents
Mosaic structure for eliminating internal stress of tube panel of waste heat boiler same-rejection system module Download PDFInfo
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- CN113639257A CN113639257A CN202111086086.0A CN202111086086A CN113639257A CN 113639257 A CN113639257 A CN 113639257A CN 202111086086 A CN202111086086 A CN 202111086086A CN 113639257 A CN113639257 A CN 113639257A
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- evaporator
- superheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/101—Tubes having fins or ribs
- F22B37/102—Walls built-up from finned tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/107—Protection of water tubes
- F22B37/108—Protection of water tube walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/12—Forms of water tubes, e.g. of varying cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
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Abstract
The invention relates to an embedded structure for eliminating internal stress of a module tube panel of a waste heat boiler same rejection system, which comprises a medium-pressure evaporator system and a medium-pressure superheater system, wherein the medium-pressure evaporator system and the medium-pressure superheater system are arranged on the same heated surface of the module tube panel to form a module tube panel of the same rejection system; the method is characterized in that: the medium-pressure evaporator system is provided with a medium-pressure evaporator finned tube group, all evaporator finned tubes in the medium-pressure evaporator finned tube group are connected to form more than two evaporator finned tube groups, and an elastic constraint structure of the medium-pressure evaporator finned tubes is formed; the medium-pressure superheater system is provided with a medium-pressure superheater finned tube group, and all evaporator finned tubes of the medium-pressure superheater finned tube group are connected into more than two superheater finned tube groups to form a medium-pressure evaporator finned tube elastic constraint structure; the evaporator finned tubes are connected with the superheater finned tubes in a grouping and overlapping mode to form an E-shaped mosaic structure. The tube panel internal stress is eliminated, the heated finned tube is prevented from being connected and loosened, leakage accidents are prevented, and the like.
Description
The technical field is as follows:
the invention relates to an embedded structure for eliminating internal stress of a module tube panel of a same rejection system of a waste heat boiler, which is suitable for a structure of a medium-pressure system of the waste heat boiler in a module tube panel combination different subsystems. Belongs to the technical field of power generation industry and accessory equipment.
Prevent the accelerated aging and the tensile cracking of the welding seam of the finned tube caused by the temperature and the expansion difference of working media of different subsystems in the same tube panel, which causes the frequent leakage of the finned tube during the middle steaming and the middle passing,
background art:
at present, most of heated module tube panels of a medium-pressure system of a waste heat boiler are disposable and belong to maintenance-free equipment. However, according to the practical situation of the waste heat boiler in domestic production and application for more than ten years, the leakage of the heated module tube panel of the medium-pressure system of the waste heat boiler occurs at certain times, and mainly caused by the following reasons:
on the one hand, this kind of unit is import equipment a bit, and its project organization is for taking basic load operation mode, and is lower to the fixed structural strength between the pipeline of its module inside is fixed and the tube panel, and structural design is simple partially, only can satisfy and take basic load operation, and its purpose is in order to save manufacturing cost. When the device is in a non-belt basic load operation mode, the connection of the heated finned tubes is easy to loosen, so that leakage accidents are caused.
In a second aspect, a tube panel group of a waste heat boiler medium-pressure system is provided with a medium-pressure evaporator fin tube and a medium-pressure superheater fin tube combination, the temperature difference of working media of two sets of fin tubes is about 33 ℃, the difference of the temperature difference expansion changes between the two sets of fin tubes causes internal stress inside the tube panel, and the tube panel of the waste heat boiler medium-pressure system in the prior art fixes the two sets of fin tubes according to the same type of tubes, so that the defects of a connecting structure exist, the internal stress inside the tube panel accelerates the aging of the tubes and the cracks of welding seams easily, and the connection of the heated fin tubes is loosened and leakage accidents are caused.
In the third aspect, most of the domestic 9F combined cycle units are operated in a long-term two-shift mode, the starting speed, the stopping speed and the load ascending and descending speeds of the combined cycle units are much higher than those of coal-fired units, the temperature change rate is very high, the actual application requirement strength is more and larger than the influence factor of the design strength, and therefore new problems caused by fatigue failure and the like due to temperature alternating stress caused by frequent starting cannot be avoided.
Therefore, a structure for eliminating the internal stress of the tube panel of the intermediate-pressure system of the waste heat boiler needs to be arranged.
The invention content is as follows:
the invention aims to solve the problems that in the prior art, the structure of a heated module tube panel of a medium-pressure system of a waste heat boiler is unreasonable, internal stress is easily generated, the connection of heated fin tubes is loosened, leakage accidents are caused, and the like, and provides an embedded structure for eliminating the internal stress of the module tube panels of a same-row different system of the waste heat boiler. The tube panel has the prominent substantive characteristics and the obvious technical progress that the structure is simple and reasonable, the internal stress of the tube panel is eliminated, the loose connection of the heated finned tubes is prevented, the leakage accident is prevented, and the like.
The purpose of the invention can be achieved by adopting the following technical scheme:
the mosaic structure for eliminating the internal stress of the tube panels of the waste heat boiler same rejection system module comprises a medium-pressure evaporator system and a medium-pressure superheater system, wherein the medium-pressure evaporator system and the medium-pressure superheater system are arranged on the same heated surface of the module tube panels to form the module tube panels of the same rejection system module; the structure is characterized in that: the medium-pressure evaporator system is provided with a medium-pressure evaporator finned tube group, all evaporator finned tubes in the medium-pressure evaporator finned tube group are connected to form more than two evaporator finned tube groups, the joints of the evaporator finned tubes are in an elastic connection structure to prevent damage, and an elastic constraint structure of the medium-pressure evaporator finned tubes is formed; the medium-pressure superheater system is provided with a medium-pressure superheater finned tube group, all evaporator finned tubes of the medium-pressure superheater finned tube group are connected into more than two superheater finned tube groups, and the superheater finned tubes are fixed in the groups through a steel structure to form a medium-pressure evaporator finned tube elastic constraint structure; the evaporator finned tube groups are connected with the superheater finned tube groups in an overlapping mode, and in the formed overlapping structure, part of superheater finned tubes are embedded into the medium-pressure evaporator finned tube group or part of evaporator finned tubes are embedded into the medium-pressure superheater finned tube group to form an E-shaped embedded structure; a separation frame is arranged at the joint of the intermediate-pressure evaporator finned tube group and the intermediate-pressure superheater finned tube group to prevent the intermediate-pressure evaporator finned tube group and the intermediate-pressure superheater finned tube group from serial vibration, so that the internal stress of a tube panel structure of a module of the same rejection system is eliminated.
The purpose of the invention can be achieved by adopting the following technical scheme:
further, the medium-pressure evaporator finned tube group comprises one evaporator finned tube group and two evaporator finned tube groups, and the medium-pressure superheater finned tube group comprises one superheater finned tube group, two superheater finned tube groups and three superheater finned tube groups; one of the evaporator finned tube groups and the second of the evaporator finned tube groups are located in the middle of the module tube panel, and the one of the superheater finned tube groups and the second of the superheater finned tube groups are located on two sides of the one of the evaporator finned tube groups and the second of the evaporator finned tube groups; the third superheater finned tube group is in a T shape and is positioned above the first evaporator finned tube group and the second evaporator finned tube group and inserted into the connecting position of the first evaporator finned tube group and the second evaporator finned tube group; forming an E-shaped mosaic structure which can freely expand but is mutually limited in front, back, left and right; or the medium-pressure evaporator finned tube group comprises one evaporator finned tube group, two evaporator finned tube groups and two evaporator finned tube groups, and the medium-pressure superheater finned tube group 2 comprises one superheater finned tube group and two superheater finned tube groups; the first superheater finned tube group and the second superheater finned tube group are located in the middle of the module tube panel, and the first evaporator finned tube group and the second evaporator finned tube group are located on two sides of the first superheater finned tube group and the second superheater finned tube group; the third evaporator finned tube group is in a T shape and is positioned above the first superheater finned tube group and the second superheater finned tube group and inserted into the connecting position of the first superheater finned tube group and the second superheater finned tube group; an E-shaped mosaic structure is formed to freely expand but to be mutually limited in front, back, left and right.
Further, in the same cross-section of module tube panel, transversely carry the middle pressure evaporator fin pipe of different rows of middle pressure evaporator fin pipe group with channel-section steel 3 along flue gas circulation direction S promptly, the middle pressure evaporator fin pipe separates and gapped with the square steel support for the middle pressure evaporator fin pipe in the same row, and both sides are consolidated through the steel sheet, and the square steel support links into an integrated entity through welding and channel-section steel, and the channel-section steel links into an integrated entity through welding and steel sheet to make all middle pressure evaporator fin pipes form a whole, form one of fixed knot structure.
Furthermore, a transverse bar is arranged in one of the fixed structures, and the channel steel is movably connected with the transverse bar to form an elastic limiting structure for each medium-pressure evaporator finned tube so as to avoid damaging the medium-pressure evaporator finned tubes; namely, no welding reinforcement is arranged between the channel steel and the transverse bar.
Furthermore, a semi-circular pipe clamp, a comb-shaped plate, a baffle plate and a cross bar are arranged at the joint of the intermediate-pressure evaporator fin pipe group and the intermediate-pressure superheater fin pipe group; the semi-circular arc pipe clamps comprise a wide semi-circular arc pipe clamp and a narrow semi-circular arc pipe clamp, the position of a square steel support or each layer of medium-pressure superheater finned pipes 200mm away from the lower part of the square steel support is polished by 180mm-220mm fin layers to form a 180mm-220mm light pipe section, the medium-pressure superheater finned pipe on the left side and the medium-pressure superheater finned pipe on the right side are respectively clamped by a group of circular arc pipe clamps, then tightened by bolts and then spot welded, the circular arc pipe clamps are firmly welded to the half parts, and then a welding comb plate and a baffle plate are sequentially arranged on the circular arc pipe clamps to form a second fixing structure so as to strengthen the restraint of the medium-pressure evaporator finned pipe group and the superheater medium-pressure finned pipe group; the rigidity of the whole medium-pressure superheater tube bundle is enhanced, and the forward and backward shaking of the tube bundle is reduced.
Further, the baffle and the cross bars form a movable connecting structure, namely, no welding reinforcement is adopted.
Furthermore, all parts of the first fixing structure and the second fixing structure are made of 304 stainless steel or 1Cr18Ni9Ti alloy steel, and the edges of the parts are provided with chamfers to prevent the pipes from being cut.
Furthermore, the channel steel and the strip-shaped square steel for the same row of tubes of the finned tube group of the medium-pressure evaporator are separated on the same horizontal plane at four sides to limit and leave gaps, the contact position of the channel steel and the strip-shaped square steel for the row of tubes is fixed by spot welding, and the finned tubes are limited by elasticity so that the tubes can expand freely.
Furthermore, the vertical direction of the module tube panel is divided into five layers of mosaic structures, and the medium-pressure evaporator finned tube groups and the medium-pressure superheater finned tube groups of each layer are mutually overlapped to form an E-shaped mosaic structure; pipe clamps arranged on the medium-pressure evaporator finned tube groups and the medium-pressure superheater finned tube groups on the same layer are staggered by 200mm in elevation.
Further, fluid smoke flowing through the same heating surface of the module tube panel is a heating source, the temperature of the smoke is 286 ℃, the medium-pressure superheater working medium is 278.7 ℃, and the medium-pressure evaporator working medium is 245.6 ℃.
The invention has the following prominent substantive characteristics and remarkable progress:
1. the medium-pressure evaporator system is provided with the medium-pressure evaporator finned tube group, all evaporator finned tubes in the medium-pressure evaporator finned tube group are connected to form more than two evaporator finned tube groups, the connection part of each evaporator finned tube is of an elastic connection structure to prevent damage, and an elastic constraint structure of the medium-pressure evaporator finned tubes is formed; the medium-pressure superheater system is provided with a medium-pressure superheater finned tube group, all evaporator finned tubes of the medium-pressure superheater finned tube group are connected into more than two superheater finned tube groups, and the superheater finned tubes are fixed in the groups through a steel structure to form a medium-pressure evaporator finned tube elastic constraint structure; the evaporator finned tube groups are connected with the superheater finned tube groups in an overlapping mode, and in the formed overlapping structure, part of superheater finned tubes are embedded into the medium-pressure evaporator finned tube group or part of evaporator finned tubes are embedded into the medium-pressure superheater finned tube group to form an E-shaped embedded structure; a separation frame is arranged at the joint of the intermediate-pressure evaporator finned tube group and the intermediate-pressure superheater finned tube group to prevent the intermediate-pressure evaporator finned tube group and the intermediate-pressure superheater finned tube group from serial vibration, so that the internal stress of a tube panel structure of a module of the same rejection system is eliminated. Therefore, the problems that the tube panel of a heated module of the intermediate pressure system of the waste heat boiler in the prior art is unreasonable in structure and easy to generate internal stress, so that the heated finned tube is loose in connection and leakage accidents are caused are solved, and the intermediate pressure system has the prominent substantive characteristics and obvious technical progress that the tube panel is simple and reasonable in structure, the internal stress of the tube panel is eliminated, the heated finned tube is prevented from being loose in connection and the leakage accidents are prevented.
2. According to the invention, because the fin tube bundle of the medium-pressure evaporator and the fin tube bundles of the two medium-pressure superheaters form the E-shaped embedded structures which are independent and limited respectively and can be expanded freely but limited mutually front, back, left and right, the whole module can form a whole, two different subsystems in the tube panel of the module are expanded independently, vibration is limited and protected, internal stress in the tube panel of the medium-pressure module is eliminated, and aging and tube explosion of the mixed calandria welding line are avoided.
3. The transformation scheme combines field conditions, can optimize the module structure, does not damage the original finned tube, if the original structural module is used for many years, the residual service life of the old welding line is considered, and the upper bent tube and the lower bent tube are replaced firstly during the transformation. The transformation cost is low, the efficiency is high, the effect is good and the service life is prolonged as proved by three-year application tests of the unit, the problem that the heated finned tube leaks can be solved, and the reliability and the safety of equipment are improved. However, the construction is technically difficult and needs a manufacturer or a professional technical team trained by the manufacturer to implement the construction.
Drawings
FIG. 1 is a schematic cross-sectional view of a portion of a modular tube panel according to an embodiment of the present invention.
Fig. 2 is a schematic sectional view of the structure along the line a-a in fig. 1.
Detailed Description
Specific example 1:
referring to fig. 1 and 2, the present embodiment includes a medium-pressure evaporator system and a medium-pressure superheater system, which are disposed on the same heated surface of the module tube panel to form a module tube panel of the same rejection system; the medium-pressure evaporator system is provided with a medium-pressure evaporator finned tube group 1, all evaporator finned tubes in the medium-pressure evaporator finned tube group 1 are connected to form more than two evaporator finned tube groups, the joints of the evaporator finned tubes are elastic connection structures to prevent damage, and an elastic constraint structure of the medium-pressure evaporator finned tubes is formed; the medium-pressure superheater system is provided with a medium-pressure superheater finned tube group 2, all evaporator finned tubes of the medium-pressure superheater finned tube group 2 are connected into more than two superheater finned tube groups, and each superheater finned tube group is fixed through a steel structure to form a medium-pressure evaporator finned tube elastic constraint structure; the evaporator finned tube groups are connected with the superheater finned tube groups in an overlapping mode, and in the formed overlapping structure, part of superheater finned tubes are embedded into the medium-pressure evaporator finned tube group or part of evaporator finned tubes are embedded into the medium-pressure superheater finned tube group to form an E-shaped embedded structure; a separation frame is arranged at the joint of the medium-pressure evaporator finned tube group and the medium-pressure superheater finned tube group to prevent the medium-pressure evaporator finned tube group 1 and the medium-pressure superheater finned tube group 2 from oscillating, so that the internal stress of the tube panel structure of the modules of the same rejection system is eliminated.
In this embodiment:
the medium-pressure evaporator finned tube group 1 comprises one evaporator finned tube group 1-1 and two evaporator finned tube groups 1-2, and the medium-pressure superheater finned tube group 2 comprises one superheater finned tube group 2-1, two superheater finned tube groups 2-2 and three superheater finned tube groups 2-3; one 1-1 of the evaporator fin tube groups and two 1-2 of the evaporator fin tube groups are located in the middle of the module tube panel, one 2-1 of the superheater fin tube groups and two 2-2 of the superheater fin tube groups are located on two sides of one 1-1 of the evaporator fin tube groups and two 1-2 of the evaporator fin tube groups; the third group 2-3 of the superheater finned tubes is in a T shape and is positioned on the first group 1-1 of the evaporator finned tubes and the second group 1-2 of the evaporator finned tubes and is inserted into the connecting part of the first group 1-1 of the evaporator finned tubes and the second group 1-2 of the evaporator finned tubes; an E-shaped mosaic structure is formed to freely expand but to be mutually limited in front, back, left and right.
At the same cross-section of module tube panel, transversely clip the different row middling pressure evaporimeter fin pipe of middling pressure evaporimeter fin nest of tubes 1 with channel-section steel 3 along flue gas circulation direction S promptly, the square steel support 4 that is used for the middling pressure evaporimeter fin pipe in the same row separates and gapped, both sides are consolidated through steel sheet 5, square steel support 4 links into an integrated entity through welding and channel-section steel 3, channel-section steel 3 links into an integrated entity through welding and steel sheet 5 to make all middling pressure evaporimeter fin pipes form a whole, form one of fixed knot and construct.
A transverse bar 9 is arranged in one of the fixed structures, and the channel steel 3 is movably connected with the transverse bar 9 to form an elastic limiting structure for each medium-pressure evaporator finned tube so as to avoid damaging the medium-pressure evaporator finned tubes; namely, no welding reinforcement is arranged between the channel steel 3 and the cross bars 9.
The connection part of the middle-pressure evaporator finned tube group and the middle-pressure superheater finned tube group is provided with a semi-circular tube clamp 6, a comb-shaped plate 7, a baffle plate 8 and a cross bar 9; the semi-circular arc pipe clamps 6 comprise wide semi-circular arc pipe clamps 6-1 and narrow semi-circular arc pipe clamps 6-2, the position of the square steel support 4 or each layer of medium-pressure superheater finned pipe 200mm below the square steel support 4 is polished by 180mm-220mm fin layers to form a light pipe section of 180mm-220mm, the medium-pressure superheater finned pipe on the left side and the medium-pressure superheater finned pipe on the right side are respectively clamped by a group of circular arc pipe clamps 6, the circular arc pipe clamps 6 are tightened by bolts and then are welded firmly in half and half, and a welding comb plate 7 and a baffle plate 8 are sequentially arranged on the circular arc pipe clamps 6 to form a second fixing structure so as to strengthen the restraint of the medium-pressure evaporator finned pipe groups and the medium-pressure superheater finned pipe groups; the rigidity of the whole medium-pressure superheater tube bundle is enhanced, and the forward and backward shaking of the tube bundle is reduced.
The baffle 8 and the cross bar 9 form a movable connecting structure, namely, no welding reinforcement.
All parts of the first fixing structure and the second fixing structure are made of 304 stainless steel or 1Cr18Ni9Ti alloy steel, and the edges of the parts are provided with chamfers to prevent the pipes from being cut.
The channel steel and the bar-shaped square steel for the same calandria of the medium-pressure evaporator finned tube group are separated at four sides on the same horizontal plane to limit and leave gaps, the contact position of the channel steel and the bar-shaped square steel for the calandria is fixed by spot welding, and the finned tube is limited to be elastic so that the finned tube can expand freely.
Fig. 1 is a schematic partial structure diagram of the present embodiment, in which a module tube panel according to the present embodiment is divided into five layers in a vertical direction into an arrangement of an damascene structure, and a group of medium-pressure evaporator fin tubes and a group of medium-pressure superheater fin tubes in each layer are stacked together to form an E-shaped damascene structure; pipe clamps arranged on the medium-pressure evaporator finned tube groups and the medium-pressure superheater finned tube groups on the same layer are staggered by 200mm in elevation.
The fluid smoke flowing through the same heated surface of the module tube panel is a heating source, the smoke temperature is 286 ℃, the medium-pressure superheater working medium is 278.7 ℃, and the medium-pressure evaporator working medium is 245.6 ℃.
Referring to fig. 1, the width L of the tube panel of the #4 module according to this embodiment is 3537mm, the center distance L3(L4, L5) between the two fin tubes is 95.6mm, the width L1 of one of the evaporator fin tube groups is 860.4mm, the width L2 of the two evaporator fin tube groups is 956mm, and the height H1 of the one and the two superheater fin tube groups is 114.3 mm.
Specific example 2:
the specific embodiment 2 of the present invention is characterized in that: the medium-pressure evaporator finned tube group 1 comprises one evaporator finned tube group, two evaporator finned tube groups and two evaporator finned tube groups, and the medium-pressure superheater finned tube group 2 comprises one superheater finned tube group and two superheater finned tube groups; the first superheater finned tube group and the second superheater finned tube group are located in the middle of the module tube panel, and the first evaporator finned tube group and the second evaporator finned tube group are located on two sides of the first superheater finned tube group and the second superheater finned tube group; the third evaporator finned tube group is in a T shape and is positioned above the first superheater finned tube group and the second superheater finned tube group and inserted into the connecting position of the first superheater finned tube group and the second superheater finned tube group; an E-shaped mosaic structure is formed to freely expand but to be mutually limited in front, back, left and right. The rest of the structure is the same as that of embodiment 1.
Other specific examples:
other specific embodiments of the invention are characterized in that: the module tube panel related to the embodiment is divided into two layers, three layers, four layers, six layers or seven layers in the vertical direction to arrange an embedded structure, and medium-pressure evaporator finned tube groups and medium-pressure superheater finned tube groups of each layer are mutually overlapped to form an E-shaped embedded structure; pipe clamps arranged on the medium-pressure evaporator finned tube groups and the medium-pressure superheater finned tube groups on the same layer are staggered by 200mm in elevation. The rest is the same as embodiment 1 or embodiment 2.
In summary, after the invention is reinforced respectively, the medium-pressure evaporator finned tube bundle and the two medium-pressure superheater finned tube bundles form independent and limited E-shaped mosaic structures respectively, so as to expand freely but limit each other front, back, left and right. After being respectively reinforced, the medium-pressure evaporator finned tube bundle and the two medium-pressure superheater finned tube bundles form independent and limited E-shaped mosaic structures, and can freely expand but be limited in front, back, left and right. The parts of the connecting structure need to be processed and prefabricated in advance, and the local size needs to be cut according to the field installation condition. After using this connection structure on different elevation layers, will make whole module form a whole, two kinds of different subsystems independently expand in the tube panel of this module, and the vibration also obtains the restriction protection, eliminates the internal stress in the medium-pressure module tube panel, avoids the ageing booster of mixed calandria welding seam.
According to practical application, the invention can optimize the module structure without damaging the original finned tube, if the original structural module is used for many years, the residual service life of the old welding line is considered, and the upper bent tube and the lower bent tube are replaced firstly during the transformation period. The transformation cost is low, the efficiency is high, the effect is good and the service life is prolonged as proved by three-year application tests of the unit, the problem that the heated finned tube leaks can be solved, and the reliability and the safety of equipment are improved. However, the construction is technically difficult and needs a manufacturer or a professional technical team trained by the manufacturer to implement the construction.
The invention relates to a combined structure of different subsystems of a tube panel of a medium-pressure system module of a waste heat boiler, which prevents the situation that the weld joint of a finned tube is frequently leaked during steam generation and medium-pressure passing through the finned tube due to accelerated aging and tensile cracking of the weld joint of the finned tube caused by the temperature and expansion difference of working media of different subsystems in the same tube panel. The weld joint strength of the elbow pipe is recovered by replacing a long-term running medium-pressure evaporator fin pipe, a medium-pressure superheater fin pipe and upper and lower header elbow pipes; and then cutting off all layers of support connections of the medium-pressure evaporator and the medium-pressure superheater, separating the medium-pressure superheater from the shockproof support of the medium-pressure evaporator, realizing the reconstruction of the mosaic structure in the module tube panel, eliminating internal stress and enabling all the fin tubes to expand freely.
Claims (10)
1. The mosaic structure for eliminating the internal stress of the tube panels of the waste heat boiler same rejection system module comprises a medium-pressure evaporator system and a medium-pressure superheater system, wherein the medium-pressure evaporator system and the medium-pressure superheater system are arranged on the same heated surface of the module tube panels to form the module tube panels of the same rejection system module; the method is characterized in that: the medium-pressure evaporator system is provided with a medium-pressure evaporator finned tube group (1), all evaporator finned tubes in the medium-pressure evaporator finned tube group (1) are connected to form more than two evaporator finned tube groups, the joints of the evaporator finned tubes are elastic connection structures to prevent damage, and an elastic constraint structure of the medium-pressure evaporator finned tubes is formed; the medium-pressure superheater system is provided with a medium-pressure superheater finned tube group (2), all evaporator finned tubes of the medium-pressure superheater finned tube group (2) are connected into more than two superheater finned tube groups, and the superheater finned tubes are fixed in groups through a steel structure to form a medium-pressure evaporator finned tube elastic constraint structure; the evaporator finned tube groups are connected with the superheater finned tube groups in an overlapping mode, and in the formed overlapping structure, part of superheater finned tubes are embedded into the medium-pressure evaporator finned tube group or part of evaporator finned tubes are embedded into the medium-pressure superheater finned tube group to form an E-shaped embedded structure; a separation frame is arranged at the joint of the medium-pressure evaporator finned tube group and the medium-pressure superheater finned tube group to prevent the medium-pressure evaporator finned tube group (1) and the medium-pressure superheater finned tube group (2) from vibrating in series, so that the internal stress of the tube panel structure of the modules of the same rejection system is eliminated.
2. The mosaic structure for eliminating the internal stress of the tube panel of the exhaust-heat boiler co-rejection system module according to claim 1, wherein: the medium-pressure evaporator finned tube group (1) comprises one evaporator finned tube group (1-1) and two evaporator finned tube groups (1-2), and the medium-pressure superheater finned tube group (2) comprises one superheater finned tube group (2-1), two superheater finned tube groups (2-2) and three superheater finned tube groups (2-3); one (1-1) of the evaporator fin tube groups and the second (1-2) of the evaporator fin tube groups are positioned in the middle of the module tube panel, and one (2-1) of the superheater fin tube groups and the second (2-2) of the superheater fin tube groups are positioned on two sides of the one (1-1) of the evaporator fin tube groups and the second (1-2) of the evaporator fin tube groups; the third superheater finned tube group (2-3) is in a T shape and is positioned above the first evaporator finned tube group (1-1) and the second evaporator finned tube group (1-2) and is inserted into the connecting part of the first evaporator finned tube group (1-1) and the second evaporator finned tube group (1-2); forming an E-shaped mosaic structure which can freely expand but is mutually limited in front, back, left and right; or the medium-pressure evaporator finned tube group (1) comprises one evaporator finned tube group, two evaporator finned tube groups and two evaporator finned tube groups, and the medium-pressure superheater finned tube group (2) comprises one superheater finned tube group and two superheater finned tube groups; the first superheater finned tube group and the second superheater finned tube group are located in the middle of the module tube panel, and the first evaporator finned tube group and the second evaporator finned tube group are located on two sides of the first superheater finned tube group and the second superheater finned tube group; the third evaporator finned tube group is in a T shape and is positioned above the first superheater finned tube group and the second superheater finned tube group and inserted into the connecting position of the first superheater finned tube group and the second superheater finned tube group; an E-shaped mosaic structure is formed to freely expand but to be mutually limited in front, back, left and right.
3. The mosaic structure for eliminating the internal stress of the tube panel of the exhaust-heat boiler co-rejection system module according to claim 2, characterized in that: at the same cross-section of module tube panel, transversely clip medium pressure evaporimeter fin pipe in the different rows of medium pressure evaporimeter fin nest of tubes (1) with channel-section steel (3) along flue gas circulation direction S promptly, in same row medium pressure evaporimeter fin pipe separate and gapped with square steel support (4), steel sheet (5) are consolidated through steel sheet (5), square steel support (4) link into an integrated entity through welding and channel-section steel (3), channel-section steel (3) link into an integrated entity through welding and steel sheet (5), so that all medium pressure evaporimeter fin pipe form a whole, form one of fixed knot structure.
4. The mosaic structure for eliminating the internal stress of the tube panel of the exhaust-heat boiler co-rejection system module according to claim 3, wherein: a transverse bar (9) is arranged in one of the fixed structures, and the channel steel (3) is movably connected with the transverse bar (9) to form an elastic limiting structure for each medium-pressure evaporator fin tube so as to avoid damaging the medium-pressure evaporator fin tube; namely, no welding reinforcement is carried out between the channel steel (3) and the transverse bar (9).
5. The mosaic structure for eliminating the internal stress of the tube panels of the modules of the exhaust-heat boiler and the rejection system according to claim 4, wherein: the connection part of the middle-pressure evaporator fin tube group and the middle-pressure superheater fin tube group is provided with a semi-circular tube clamp (6), a comb-shaped plate (7), a baffle (8) and a cross bar (9); the semi-circular arc pipe clamps (6) comprise wide semi-circular arc pipe clamps (6-1) and narrow semi-circular arc pipe clamps (6-2), each layer of medium-pressure superheater finned pipe at the position of the square steel support (4) or 200mm below the square steel support (4) is polished by 180mm-220mm fin layers to form a 180mm-220mm light pipe section, the medium-pressure superheater finned pipe at the left side and the medium-pressure superheater finned pipe at the right side (11) are respectively clamped by a group of circular arc pipe clamps (6), then bolts are tightened and then spot welded, the circular arc pipe clamps (6) are firmly welded in half and half positions, and then a welding comb plate (7) and a baffle (8) are sequentially arranged on the circular arc pipe clamps (6) to form a second fixed structure so as to strengthen the restraint of the medium-pressure evaporator finned pipe group and the medium-pressure finned pipe group; the rigidity of the whole medium-pressure superheater tube bundle is enhanced, and the forward and backward shaking of the tube bundle is reduced.
6. The mosaic structure for eliminating the internal stress of the tube panel of the exhaust-heat boiler co-rejection system module according to claim 5, wherein: the baffle (8) and the cross bar (9) form a movable connecting structure, namely, welding reinforcement is not needed.
7. The mosaic structure for eliminating the internal stress of the tube panel of the exhaust-heat boiler co-rejection system module according to claim 5, wherein: all parts of the first fixing structure and the second fixing structure are made of 304 stainless steel or 1Cr18Ni9Ti alloy steel, and the edges of the parts are provided with chamfers to prevent the pipes from being cut.
8. The mosaic structure for eliminating the internal stress of the tube panels of the modules of the exhaust-heat boiler and the rejection system according to claim 7, wherein: the channel steel and the bar-shaped square steel for the same calandria of the medium-pressure evaporator finned tube group are separated at four sides on the same horizontal plane to limit and leave gaps, the contact position of the channel steel and the bar-shaped square steel for the calandria is fixed by spot welding, and the finned tube is limited to be elastic so that the finned tube can expand freely.
9. The mosaic structure for eliminating the internal stress of the tube panels of the modules of the exhaust-heat boiler and the rejection system according to claim 8, wherein: the vertical direction of the module tube panel is divided into five layers of arrangement mosaic structures, and medium-pressure evaporator fin tube groups and medium-pressure superheater fin tube groups of each layer are mutually overlapped to form an E-shaped mosaic structure; pipe clamps arranged on the medium-pressure evaporator finned tube groups and the medium-pressure superheater finned tube groups on the same layer are staggered by 200mm in elevation.
10. The mosaic structure for eliminating the internal stress of the tube panels of the modules of the exhaust-heat boiler and the exhaust-heat system according to claim 10, wherein: the fluid smoke flowing through the same heated surface of the module tube panel is a heating source, the smoke temperature is 286 ℃, the medium-pressure superheater working medium is 278.7 ℃, and the medium-pressure evaporator working medium is 245.6 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111086086.0A CN113639257A (en) | 2021-09-16 | 2021-09-16 | Mosaic structure for eliminating internal stress of tube panel of waste heat boiler same-rejection system module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111086086.0A CN113639257A (en) | 2021-09-16 | 2021-09-16 | Mosaic structure for eliminating internal stress of tube panel of waste heat boiler same-rejection system module |
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| Publication Number | Publication Date |
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| CN113639257A true CN113639257A (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111086086.0A Pending CN113639257A (en) | 2021-09-16 | 2021-09-16 | Mosaic structure for eliminating internal stress of tube panel of waste heat boiler same-rejection system module |
Country Status (1)
| Country | Link |
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| CN (1) | CN113639257A (en) |
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2021
- 2021-09-16 CN CN202111086086.0A patent/CN113639257A/en active Pending
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