CN215257810U - Radial arc sealing device of air preheater hot junction and mounting structure thereof - Google Patents
Radial arc sealing device of air preheater hot junction and mounting structure thereof Download PDFInfo
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- CN215257810U CN215257810U CN202121561017.6U CN202121561017U CN215257810U CN 215257810 U CN215257810 U CN 215257810U CN 202121561017 U CN202121561017 U CN 202121561017U CN 215257810 U CN215257810 U CN 215257810U
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Abstract
The utility model discloses a radial arc sealing device for hot end of air preheater and a mounting structure thereof, wherein the radial arc sealing device for hot end of air preheater comprises a sealing sheet, a fixed clamp plate, a first driving clamp plate, a second driving clamp plate and a wrapping sheet; the expansion coefficients of the sealing plate, the fixing clamping plate and the wrapping plate are smaller than those of the first driving clamping plate and the second driving clamping plate; the sealing piece and the wrapping piece are oppositely arranged, one end of the sealing piece in the width direction exceeds the wrapping piece to form a sealing end, and the sealing end of the sealing piece is provided with a stress dividing slit from the top; the length of the first driving clamping plate is greater than that of the second driving clamping plate; the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are sequentially arranged between the sealing sheet and the wrapping sheet; the first driving clamping plate and the second driving clamping plate adopt three-point welding. The utility model discloses the radial arc sealing device in air preheater hot junction can cooperate the deformation characteristics of the fan-shaped board bottom face downwarping in air preheater hot junction when hot, and then reduces the clearance that leaks out, is showing and is reducing the air preheater rate of leaking out.
Description
Technical Field
The utility model relates to a radial arc sealing device in air preheater hot junction and mounting structure thereof is applicable to the air preheater of the fixed sector plate in hot junction, belongs to the sealed technical field of air preheater.
Background
The air preheater is a heat exchange device applied to a large coal-fired power station boiler, and utilizes the heat of boiler flue gas to heat air required by combustion so as to improve the efficiency of the boiler. The air preheater rotor changes from a cold state to a hot state, and mushroom-shaped deformation is generated due to different temperatures of the upper end surface and the lower end surface and the weakening of rigidity of the steel after being heated. The hot end sector plate of the air preheater manufactured by HOWDEN (hot end gas turbine generator) which is a leading air preheater manufacturer in the world is in a fixed design, the traditional rigid sealing plate is fixed on the rotor partition plate in a segmented mode through bolts, the air leakage gap is changed along with the deformation of the rotor partition plate, and a large triangular air leakage area can be formed in a hot state.
For the air preheater adopting the fixed fan-shaped plate, from a cold state to a hot state, because the temperature of the upper side surface (heat preservation side) of the hot end fan-shaped plate is lower than that of the lower side surface (side close to the rotor) and the rigidity of the fan-shaped plate is reduced, the bottom surface of the hot end fan-shaped plate is not a plane but a downward curved surface under the hot state condition, so that the air leakage problem of the hot end of the air preheater is more prominent.
In order to reduce the area of the air leakage area and reduce the air leakage rate of the air preheater, two technical routes are generally adopted in the current engineering: the automatic tracking system is characterized by comprising a sector plate automatic tracking system (LCS for short) equipped in three host manufacturers (east pan, Ha pan and upper pan) in China; the second is the flexible sealing technology developed in recent years. This actually represents two aspects of a problem: the sealing problem of the air preheater is the matching problem of the sealing sheet and the sector plate, and the purpose of reducing air leakage can be realized by automatically attaching the sealing sheet to the sector plate and automatically tracking the sealing sheet by the sector plate. However, the two schemes have the following problems in engineering application: influenced by various factors such as severe working conditions (high temperature, dust and the like), maintenance quality, management level and the like, most LCS systems of power plants cannot be normally put into operation or the operation effect is not ideal. HOWDEN has not been able to support LCS on air pre-heaters, and it is also described from the side that this technique needs to be further improved. The traditional flexible sealing technology is exposed to the problems of too fast abrasion, unreliable structure, insufficient clearance compensation amount and the like.
In a word, the air leakage problem of the hot end radial air leakage area is not thoroughly solved, the diameter of the rotor of the air preheater is continuously increased along with the development of a unit in a large-capacity direction, and if no measures are taken, the air leakage share of the hot end radial air leakage area is larger and larger. The radial air leakage of the hot end of the air preheater equipped in the unit with the power of 600MW or more accounts for more than 50% of the total air leakage, the absolute air leakage to the flue gas side also exceeds 3%, and the primary air leakage rate may exceed 30%.
Disclosure of Invention
The utility model provides a radial arc sealing device in air preheater hot junction and mounting structure thereof can cooperate this deformation characteristics of air preheater hot junction fan-shaped plate bottom downward bending when hot, and then reduces the clearance that leaks out, is showing and is reducing air preheater air leakage rate.
For solving the technical problem, the utility model discloses the technical scheme who adopts as follows:
a radial arc-shaped sealing device for a hot end of an air preheater comprises a sealing sheet, a fixed clamping plate, a first driving clamping plate, a second driving clamping plate and a wrapping sheet;
waist-shaped holes are formed in the sealing piece, the fixing clamp plate, the first driving clamp plate, the second driving clamp plate and the wrapping piece;
the sealing sheet, the fixing clamp plate and the wrapping sheet are made of the same material and are made of a first material, the first driving clamp plate and the second driving clamp plate are made of the same material and are made of a second material, and the expansion coefficient of the first material is smaller than that of the second material;
defining one end of a sealing sheet and one end of a wrapping sheet in the length direction as a starting end and the other end of the sealing sheet and the wrapping sheet in the length direction as a terminal, wherein the sealing sheet and the wrapping sheet are arranged oppositely, waist-shaped holes in the sealing sheet and the wrapping sheet are equal in number and are in one-to-one correspondence, one end of the sealing sheet in the width direction exceeds the wrapping sheet to form a sealing end, the sealing end on the sealing sheet is defined as a top, the other end of the sealing sheet is defined as a bottom, and the sealing end of the sealing sheet is provided with a stress dividing slit from the top;
the number of the first driving clamping plate and the number of the second driving clamping plate are more than two, and the length of the first driving clamping plate is greater than that of the second driving clamping plate; one fixed splint is provided; the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are all arranged between the sealing plate and the wrapping sheet, the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are sequentially arranged along the direction from the starting end to the terminal end of the sealing plate, and the length of the fixed clamping plate is 1/5-2/5 of the length of the sealing plate; the fixed clamping plate is welded with the sealing sheet and the wrapping sheet; the two ends of the bottom and the middle point of the top of the first driving clamping plate and the second driving clamping plate are welded with the sealing plate and the wrapping sheet, namely the first driving clamping plate and the second driving clamping plate are connected with the sealing plate and the wrapping sheet by three-point welding;
the waist-shaped holes on the fixed clamping plate correspond to the waist-shaped holes on the sealing pieces opposite to the waist-shaped holes one by one; the first driving clamping plate and the second driving clamping plate which are right opposite to the waist-shaped hole in the sealing plate are also provided with corresponding waist-shaped holes, the waist-shaped holes of the sealing plate and the wrapping sheet which correspond to the waist-shaped holes of the first driving clamping plate and the second driving clamping plate are all provided with expansion gaps communicated with the waist-shaped holes, the expansion gaps below the waist-shaped holes of the sealing plate and the wrapping sheet penetrate through the bottoms of the sealing plate and the wrapping sheet, and the expansion gaps are not formed in the waist-shaped holes of the sealing plate and the wrapping sheet which correspond to the waist-shaped holes of the fixing clamping plate.
The aforesaid setting through first drive splint and second drive splint has improved the drive inflation volume of gasket at the maximum deformation position, and the flagging that gravity leads to can more the bigger degree offset improves sealed effect, and simultaneously, radian when can guaranteeing the gasket hot state is in the design range, can avoid the too big collision of causing of deformation to grind, can compromise sealed effect to the maximize again.
The sealing piece top stress dividing slit is arranged, so that the overall stress damage caused by collision and abrasion of sealing can be effectively reduced, and the service life of sealing is prolonged.
The expansion gaps are not formed in the waist-shaped holes of the sealing sheet and the wrapping sheet corresponding to the waist-shaped hole of the fixing clamping plate, and the expansion gaps communicated with the waist-shaped holes are only formed in the waist-shaped holes of the sealing sheet and the wrapping sheet corresponding to the waist-shaped hole of the first driving clamping plate or the waist-shaped hole of the second driving clamping plate, so that a triangular air leakage area formed in a hot state can be better compensated, and air leakage is reduced.
During the use, the length direction of gasket is radial unanimous with the rotor, and fixed splint, first drive splint, second drive splint are radially arranged from inside to outside along the rotor in proper order.
The length direction of this application gasket, solid fixed splint, first drive splint, second drive splint and parcel piece is all unanimous.
The fixed clamping plate is clamped between the sealing sheet and the wrapping sheet and is fixed in a welding mode, and the position of a welding spot is not required; the first driving clamping plate and the second driving clamping plate are only welded with the sealing plate and the wrapping plate at the two ends of the bottom and the middle point of the top, and the welding is not allowed at other positions, namely, the three-point welding is required to be formed.
By adjusting the width and the number of the first driving clamping plate and the second driving clamping plate, the radial arc-shaped sealing device at the hot end of the air preheater is ensured to be arc-shaped when in a hot state, and the arc height is 5-15 mm. As a specific implementation scheme, each of the first driving clamping plate and the second driving clamping plate respectively corresponds to one kidney-shaped hole on the sealing sheet; except the last waist-shaped hole (the last waist-shaped hole positioned at the terminal) on the sealing sheet, each waist-shaped hole is correspondingly provided with a fixed clamping plate, a first driving clamping plate or a second driving clamping plate; the number of the first driving clamping plates is equal to that of the second driving clamping plates; the length of the first driving clamping plate is 1.8-2.2 times of the length of the second driving clamping plate. By the aid of the scheme, the hot arc structure of the sealing device can be better guaranteed, and sealing performance is improved.
More preferably, the thermal expansion coefficient α of the first material at 350 ℃ ═ 11.5 ± 0.5 × 10-6/° c; the thermal expansion coefficient alpha of the second material at 350 ℃ ═ 17.33 +/-0.5 x 10-6/℃。
As a specific implementation scheme, the center distance between two adjacent waist-shaped holes on the sealing sheet is 300 +/-10 mm; the length of the second driving clamping plate is 110-130 mm.
In order to better take account of the sealing performance and the service life, a stress dividing seam is arranged between every two adjacent waist-shaped holes on the sealing sheet.
In order to avoid collision and abrasion, the sealed end of the sealing sheet forms a bending angle of 15 +/-2 degrees.
The mounting structure of the hot end radial arc sealing device of the air preheater is mounted on the hot end radial partition plate through a fixing bolt penetrating through a kidney-shaped hole, the hot end radial arc sealing device of the air preheater and a hot end sector plate of the air preheater form a sealing pair, and the length direction of the sealing piece is consistent with the radial length of a rotor of the air preheater;
the fixing bolt simultaneously penetrates through the sealing sheet, the fixing clamping plate and the waist-shaped hole in the wrapping sheet and is locked by a nut; the part is provided with a first driving clamping plate, and a fixing bolt simultaneously penetrates through the sealing plate, the first driving clamping plate and a waist-shaped hole in the wrapping sheet and is incompletely locked through a nut; and the fixing bolt simultaneously penetrates through the sealing plate, the second driving clamping plate and the waist-shaped hole in the wrapping sheet and is incompletely locked through a nut.
After the air preheater is heated, the expansion coefficient of the driving clamping plate is larger than that of the sealing plate, so that the middle part of the sealing plate is bent downwards to deform, the trend of deforming the sealing plate to be the same as that of a hot-end fan-shaped plate is presented, the traditional triangular air leakage area of the air preheater is eliminated, and the air leakage rate of the air preheater is obviously reduced.
In order to ensure that fixing bolts on waist-shaped holes of a first driving clamping plate and a second driving clamping plate are not completely locked, corresponding ball mounting holes are uniformly distributed on the peripheries of corresponding waist-shaped holes on a sealing sheet, the driving clamping plate and a wrapping sheet, a group of ball mounting holes are formed by the sealing sheet, the driving clamping plate and the corresponding ball mounting holes on the wrapping sheet, the aperture of the ball mounting holes on the outer sides of the sealing sheet and the wrapping sheet is smaller than the diameter of the balls, more than 3 groups of ball mounting holes are distributed on the periphery of each waist-shaped hole, one ball is arranged in each group of ball mounting holes, and the two sides of each ball exceed the sealing sheet and the wrapping sheet by 0.25-0.75 mm respectively; the driving clamping plate comprises a first driving clamping plate and a second driving clamping plate. That is, the diameter of the ball is 0.5-1.5mm larger than the sum of the thicknesses of the sealing sheet, the wrapping sheet and the first driving clamping plate or the second driving clamping plate.
In order to improve the balance, more than 4 groups of ball mounting holes are distributed on the periphery of each kidney-shaped hole.
When the deformation amount of the radial arc-shaped sealing device at the hot end of the air preheater is larger than the sealing clearance, in order to ensure that the sealing sheet does not collide and grind with the sector plate, the mounting structure further comprises a limiting sheet, a long-strip limiting hole is formed in the limiting sheet, the limiting sheet is located on the last waist-shaped hole at the terminal of the radial arc-shaped sealing device at the hot end of the air preheater, the fixing bolt sequentially penetrates through the long-strip limiting holes in the sealing sheet, the wrapping sheet and the limiting sheet and then is fixed by nuts, and the limiting sheet is welded on the wrapping sheet.
The technology not mentioned in the present invention refers to the prior art.
The utility model discloses radial arc sealing device in air preheater hot junction and mounting structure thereof can cooperate this deformation characteristics of the fan-shaped board bottom face downwarping in air preheater hot junction when hot, and then reduces the clearance that leaks out, is showing and is reducing the air preheater rate of leaking out.
Drawings
FIG. 1 is a schematic view of the sealing piece of the present invention;
FIG. 2 is an enlarged view of the point A in FIG. 1;
FIG. 3 is an enlarged view of the point B in FIG. 1;
fig. 4 is a schematic arrangement view of the fixing clamp plate, the first driving clamp plate and the second driving clamp plate of the present invention;
FIG. 5 is a schematic view of a first driving clamp;
FIG. 6 is a schematic view of a second driving plate;
FIG. 7 is a schematic view of the wrapping sheet structure of the present invention;
fig. 8 is a perspective view of the radial arc-shaped sealing device at the hot end of the air preheater of the present invention;
fig. 9 is a schematic view of the installation structure of the radial arc-shaped sealing device at the hot end of the air preheater of the present invention;
fig. 10 is a schematic view of the installation of the ball of the present invention;
FIG. 11 is a schematic view of the structure of the spacing piece of the present invention;
FIG. 12 is a schematic view of the hot end radial spacer and the sealing plate of the present invention in the hot state;
fig. 13 is a schematic view of the thermal expansion of the second driving clip of the present invention;
fig. 14 is a simulation result diagram of the installation structure of the radial arc-shaped sealing device at the hot end of the air preheater of the present invention;
in the figure, 1 is the sealing fin, 101 is the stress dividing slit, 2 is the solid fixed splint, 3 is the first drive splint, 4 is the second drive splint, 401 is the drive power, 402 is for opening certain angle, 403 is upwards warping, 5 is the parcel piece, 6 is waist type hole, 601 is the inflation clearance, 7 is the ball, 8 is hot junction radial baffle, 9 is the hot junction sector plate, 10 is spacing piece, 1001 is spacing hole, 11 is fixing bolt.
Detailed Description
For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.
The terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used herein as terms of orientation or positional relationship with respect to one another as shown in the drawings or in use, and are used for convenience in describing the present application and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.
Example 1
As shown in fig. 1-8, a radial arc sealing device for a hot end of an air preheater comprises a sealing sheet, a fixing clamp plate, a first driving clamp plate, a second driving clamp plate and a wrapping sheet;
waist-shaped holes are formed in the sealing piece, the fixing clamp plate, the first driving clamp plate, the second driving clamp plate and the wrapping piece;
the sealing sheet, the fixing clamp plate and the wrapping sheet are made of the same material and are made of a first material, the first driving clamp plate and the second driving clamp plate are made of the same material and are made of a second material, and the expansion coefficient of the first material is smaller than that of the second material;
defining one end of a sealing sheet and one end of a wrapping sheet in the length direction as a starting end and the other end of the sealing sheet and the wrapping sheet in the length direction as a terminal, wherein the sealing sheet and the wrapping sheet are arranged oppositely, waist-shaped holes in the sealing sheet and the wrapping sheet are equal in number and are in one-to-one correspondence, one end of the sealing sheet in the width direction exceeds the wrapping sheet to form a sealing end, the sealing end of the sealing sheet is defined as a top, the other end of the sealing sheet is defined as a bottom, a stress dividing slit is arranged at the sealing end of the sealing sheet from the top, and the length (height) of the stress dividing slit is 20 mm;
the number of the first driving clamping plate and the number of the second driving clamping plate are more than two, and the length of the first driving clamping plate is greater than that of the second driving clamping plate; one fixed splint is provided; the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are all arranged between the sealing plate and the wrapping sheet, the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are sequentially arranged along the direction from the starting end to the terminal end of the sealing plate, and the length of the fixed clamping plate is 1/5-2/5 of the length of the sealing plate; the fixed clamping plate is welded with the sealing sheet and the wrapping sheet; the two ends of the bottom and the middle point of the top of the first driving clamping plate and the second driving clamping plate are welded with the sealing plate and the wrapping sheet, namely the first driving clamping plate and the second driving clamping plate are connected with the sealing plate and the wrapping sheet by three-point welding;
the waist-shaped holes on the fixed clamping plate correspond to the waist-shaped holes on the sealing pieces opposite to the waist-shaped holes one by one; the first driving clamping plate and the second driving clamping plate which are right opposite to the waist-shaped hole in the sealing plate are also provided with corresponding waist-shaped holes, the waist-shaped holes of the sealing plate and the wrapping sheet which correspond to the waist-shaped holes of the first driving clamping plate and the second driving clamping plate are all provided with expansion gaps communicated with the waist-shaped holes, the expansion gaps below the waist-shaped holes of the sealing plate and the wrapping sheet penetrate through the bottoms of the sealing plate and the wrapping sheet, and the expansion gaps are not formed in the waist-shaped holes of the sealing plate and the wrapping sheet which correspond to the waist-shaped holes of the fixing clamping plate.
Example 2
On the basis of the embodiment 1, the following improvements are further made: the thermal expansion coefficient alpha of the first material is 11.5 multiplied by 10-6The thermal expansion coefficient alpha of the second material is 17.33 multiplied by 10 when the temperature is 350 DEG C-6/° c (350 ℃); the total length L of the sealing piece is 5446mm, the height h is 130mm, the center distance d of waist-shaped holes is 300mm, the total number of the waist-shaped holes is 19, the thickness is 2.5mm, and the bending angle of the sealing end is 15 degrees; wrapping the sheet: the thickness is 2.5mm, h is 100mm, there are 19 waist-shaped holes corresponding to waist-shaped hole one-to-one on the gasket; the fixed clamping plate covers 6 waist-shaped holes of the sealing piece from the starting end of the sealing piece; the thickness of the first driving clamping plate is 3mm, L is 240mm, 6 blocks are provided, the thickness of the second driving clamping plate is 3mm, L is 120mm, 6 blocks are provided, each first driving clamping plate and each second driving clamping plate respectively correspond to one kidney-shaped hole in the sealing sheet, namely only the last kidney-shaped hole is not provided with a driving clamping plate; on the sealing sheet, a stress dividing slit is arranged between every two adjacent waist-shaped holes; as shown in fig. 12, the radial arc sealing device at the hot end of the air preheater is in an arc shape with the arc height of 5-15mm in the thermal state of 350 ℃, and fig. 12 is a schematic diagram of the shortened length.
Example 3
In embodiment 2, as shown in fig. 9, the mounting structure of the radial arc-shaped sealing device at the hot end of the air preheater is mounted on the radial partition plate at the hot end by a fixing bolt penetrating through a kidney-shaped hole, the radial arc-shaped sealing device at the hot end of the air preheater and a hot end sector plate of the air preheater form a sealing pair, and the length direction of the sealing piece is consistent with the radial length of a rotor of the air preheater;
the fixing bolt simultaneously penetrates through the sealing sheet, the fixing clamping plate and the waist-shaped hole in the wrapping sheet and is locked by a nut; the part is provided with a first driving clamping plate, and a fixing bolt simultaneously penetrates through the sealing plate, the first driving clamping plate and a waist-shaped hole in the wrapping sheet and is incompletely locked through a nut; and the fixing bolt simultaneously penetrates through the sealing plate, the second driving clamping plate and the waist-shaped hole in the wrapping sheet and is incompletely locked through a nut.
Example 4
On the basis of the embodiment 3, the following improvements are further made: in order to ensure that the fixing bolts on the waist-shaped holes of the first driving clamping plate and the second driving clamping plate are not completely locked, as shown in fig. 10, corresponding ball mounting holes are uniformly distributed on the peripheries of the waist-shaped holes on the sealing sheet, the driving clamping plate and the wrapping sheet, the corresponding ball mounting holes on the sealing sheet, the driving clamping plate and the wrapping sheet form a group of ball mounting holes, the aperture of the ball mounting holes on the outer sides of the sealing sheet and the wrapping sheet is smaller than the diameter of the balls, namely the balls cannot fall off from the side faces of the sealing sheet and the wrapping sheet, 4 groups of ball mounting holes are distributed on the periphery of each waist-shaped hole, one ball is arranged in each group of ball mounting holes, and two sides of each ball exceed the sealing sheet and the wrapping sheet by 0.25-0.75 mm respectively; the driving clamping plate comprises a first driving clamping plate and a second driving clamping plate. That is, the diameter of the ball is 0.5-1.5mm larger than the sum of the thicknesses of the sealing sheet, the wrapping sheet and the first driving clamping plate or the second driving clamping plate.
Example 5
On the basis of the embodiment 4, the following improvements are further made: as shown in fig. 11, the mounting structure of the radial arc sealing device at the hot end of the air preheater further comprises a limiting piece, a long-strip limiting hole is formed in the limiting piece, the limiting piece is located on the last waist-shaped hole at the terminal of the radial arc sealing device at the hot end of the air preheater, the fixing bolt sequentially penetrates through the waist-shaped hole of the sealing piece, the waist-shaped hole of the wrapping piece and the long-strip limiting hole in the limiting piece and then is fixed by a nut, and the limiting piece is welded on the wrapping piece.
As shown in fig. 13, the sealing plate is provided with an expansion gap with a width of 0.2mm at the middle position of the upper part and the lower part, the thermal expansion coefficient of the first driving clamping plate and the second driving clamping plate is greater than that of the sealing plate, when the temperature rises, the thermal expansion amount generated by the driving clamping plates at two welding points at the bottom is greater than that of the sealing plate between the welding points, and under the action of the driving force of the internal thermal expansion, the sealing plate can be opened at the expansion gap position to two sides at a certain angle, and the two sides of the driving plate are deformed upwards at the same time.
4 ball mounting holes are formed around the waist-shaped hole provided with the first driving clamping plate and the second driving clamping plate, and balls are clamped in the ball mounting holes, the diameter of each ball is slightly larger than the whole thickness of the radial arc-shaped sealing device at the hot end of the air preheater, and the sealing sheet and the partition plate are in point contact instead of surface contact, so that the stress area is greatly reduced, and the friction force between the sealing sheet and the partition plate is reduced; meanwhile, due to the rolling characteristic of the steel column, the friction force between the seal and the partition plate is further reduced, and therefore the reliability of the seal during thermal compensation is guaranteed.
As shown in figure 1, by arranging the stress separation seam on the sealing sheet, the overall stress damage caused by collision and abrasion of the seal is reduced, and the service life of the seal is prolonged. When sealing as whole, a point atress compression can lead to whole strip sealed all to receive the stress, and this will lead to the whole piece of gasket to bear the stress variation, and long-term bump grinding will lead to sealed life-span to reduce. In order to avoid integral stress deformation caused by collision and grinding of the sealing plate and the sector plate, a stress dividing slit with the width of 0.2mm is arranged between every two adjacent waist-shaped holes on the sealing plate, when the stress is changed due to collision and grinding of one point, the stress is dispersed on the bending piece of the dividing slit, the maximum stress point is located at the position of the contact point, and the whole sealing plate is not extruded by the stress. According to the rotation direction of the rotor, along the bending direction of the sealing sheet, the collision and abrasion points are gradually compressed and deformed from the central cylinder to the outer side in a segmented mode, integral sealing stress deformation cannot be caused, and therefore the service life of sealing can be prolonged.
As shown in fig. 11, a sealing deformation limiting piece is arranged to restrain the maximum deformation of the sealing sheet, so as to guarantee safe operation, when the deformation of the radial arc-shaped sealing device at the hot end of the air preheater is larger than the sealing gap, in order to guarantee that the sealing sheet does not collide and grind with the sector plate, a deformation limiting piece is installed at the last bolt hole position of the radial arc-shaped sealing device at the hot end of the air preheater, and after the gap is adjusted, the limiting piece is freely suspended on a fixing bolt and locked and is welded and fixed with the wrapping sheet. A long-strip limiting hole is reserved in the middle of the sealing limiting piece, and the gap value between the limiting hole and the fixing bolt is the limit value of the upward maximum upwarp deformation of the sealing piece. When the sealed deformation volume surpassed this spacing hole clearance, the gasket can receive the restraint promptly, and upwards inflation no longer to this guarantees to set for sealed clearance, guarantees equipment safe operation.
Fig. 14 is a diagram of simulation results of the mounting structure of the above mounting structure, where the hot end is 350 ℃, the cold end is 80 ℃, and the sealing piece deformation amount simulation calculation result: max is 10.307 mm; the simulation air preheater rotor baffle structure tests the thermal state deformation result of the installation structure, the result is consistent with the trend of the modeling calculation result of the figure 13, and the practice shows that the arrangement of the first driving clamping plate and the second driving clamping plate in a specific sequence is combined with the improvement of the sealing plate structure, so that the collision and abrasion can be avoided, and the sealing effect can be improved to the maximum extent. If the second driving clamping plates are all replaced by the first driving clamping plates, the deformation quantity of the sealing plate is simulated and calculated as follows: max is 16.465mm, and deformation is too large, so that collision and abrasion are easily caused; if the first driving clamping plates are all replaced by the second driving clamping plates, the deformation quantity of the sealing plate is simulated and calculated as follows: max is 4.387mm, the deformation is too small, and the sealing performance is not obviously improved;
the air preheater of the 600MW unit of the #7 furnace of a certain power plant is modified, the average air leakage rate of the A/B side of the air leakage rate before modification is 7 percent, and the average air leakage rate is reduced to about 4 percent after sealing modification according to the scheme of the embodiment; the transformation yield is predicted as follows:
coal saving yield of 600MW × 6000 h/year × (7-4) × (0.2 × 10-6t/kWh × 700 yuan/t 151.2 ten thousand yuan/year;
the electricity-saving benefit is 10A multiplied by 6.3kV multiplied by 31/2 multiplied by 0.85 multiplied by 6000 h/year multiplied by (7-4) multiplied by 0.35 yuan/kWh multiplied by 2 pieces multiplied by 116.8 ten thousand yuan/year; the direct economic benefit of the sealing reconstruction of the air preheater of the 600MW unit is coal saving benefit and electricity saving benefit is 268 ten thousand yuan/year.
Description of the drawings:
1) when the air leakage rate of the air preheater is increased (reduced) by 1 percent, the coal consumption rate of the power generation is increased (reduced) by 0.20 g/kWh. "from" handbook of energy-saving evaluation and energy audit of thermal power plant "/Lichun, Zhang xing Ying, Liu academic Ice edition/P41.
2) Every time the air leakage rate of the air preheater is reduced by 1%, the current of three fans using a 6.3kV three-phase power supply is reduced by 15-25A (the two fans are calculated according to 20A multiplied by 2 which is 40A, the power factor is 0.85, and the unit price of standard coal is calculated to be 700 yuan/ton; annual utilization hours of computer group: 6000 hours/year; calculating the average on-line electricity price: 0.35 yuan/kWh).
Claims (10)
1. The utility model provides a radial arc sealing device in air preheater hot junction which characterized in that: the device comprises a sealing sheet, a fixed clamping plate, a first driving clamping plate, a second driving clamping plate and a wrapping sheet;
waist-shaped holes are formed in the sealing piece, the fixing clamp plate, the first driving clamp plate, the second driving clamp plate and the wrapping piece;
the sealing sheet, the fixing clamp plate and the wrapping sheet are made of the same material and are made of a first material, the first driving clamp plate and the second driving clamp plate are made of the same material and are made of a second material, and the expansion coefficient of the first material is smaller than that of the second material;
defining one end of a sealing sheet and one end of a wrapping sheet in the length direction as a starting end and the other end of the sealing sheet and the wrapping sheet in the length direction as a terminal, wherein the sealing sheet and the wrapping sheet are arranged oppositely, waist-shaped holes in the sealing sheet and the wrapping sheet are equal in number and are in one-to-one correspondence, one end of the sealing sheet in the width direction exceeds the wrapping sheet to form a sealing end, the sealing end on the sealing sheet is defined as a top, the other end of the sealing sheet is defined as a bottom, and the sealing end of the sealing sheet is provided with a stress dividing slit from the top;
the number of the first driving clamping plate and the number of the second driving clamping plate are more than two, and the length of the first driving clamping plate is greater than that of the second driving clamping plate; one fixed splint is provided; the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are all arranged between the sealing plate and the wrapping sheet, the fixed clamping plate, the first driving clamping plate and the second driving clamping plate are sequentially arranged along the direction from the starting end to the terminal end of the sealing plate, and the length of the fixed clamping plate is 1/5-2/5 of the length of the sealing plate; the fixed clamping plate is welded with the sealing sheet and the wrapping sheet; two ends of the bottom of the first driving clamping plate and the middle point of the top of the second driving clamping plate are welded with the sealing sheet and the wrapping sheet;
the waist-shaped holes on the fixed clamping plate correspond to the waist-shaped holes on the sealing pieces opposite to the waist-shaped holes one by one; the first driving clamping plate and the second driving clamping plate which are right opposite to the waist-shaped hole in the sealing plate are also provided with corresponding waist-shaped holes, the waist-shaped holes of the sealing plate and the wrapping sheet which correspond to the waist-shaped holes of the first driving clamping plate and the second driving clamping plate are all provided with expansion gaps communicated with the waist-shaped holes, the expansion gaps below the waist-shaped holes of the sealing plate and the wrapping sheet penetrate through the bottoms of the sealing plate and the wrapping sheet, and the expansion gaps are not formed in the waist-shaped holes of the sealing plate and the wrapping sheet which correspond to the waist-shaped holes of the fixing clamping plate.
2. The air preheater hot end radial arc seal device of claim 1, wherein: in a hot state, the radial arc sealing device at the hot end of the air preheater is arc-shaped, and the arc height is 5-15 mm.
3. The air preheater hot end radial arc sealing device as claimed in claim 1 or 2, wherein: on the sealing sheet, a stress dividing slit is arranged between every two adjacent waist-shaped holes; each first driving clamping plate and each second driving clamping plate respectively correspond to one kidney-shaped hole in the sealing sheet; except the last waist-shaped hole on the sealing sheet, each waist-shaped hole corresponds to a fixed clamping plate, a first driving clamping plate or a second driving clamping plate.
4. The air preheater hot end radial arc sealing device as claimed in claim 1 or 2, wherein: the number of the first driving clamping plates is equal to that of the second driving clamping plates; the length of the first driving clamping plate is 1-2.5 times of the length of the second driving clamping plate.
5. The air preheater hot end radial arc seal device according to claim 4, wherein: the center distance between two adjacent waist-shaped holes on the sealing sheet is 300 +/-50 mm; the length of the second driving clamping plate is 110-130 mm; the sealed end of the sealing sheet forms a bending angle of 15 +/-3 degrees.
6. The air preheater hot end radial arc sealing device as claimed in claim 1 or 2, wherein: the thermal expansion coefficient alpha of the first material at 350 ℃ ═ 11.5 +/-1 x 10-6/° c; the thermal expansion coefficient alpha of the second material at 350 ℃ ═ 17.33 +/-1 x 10-6/℃。
7. The mounting structure of the hot end radial arc sealing device of the air preheater as claimed in any one of claims 1 to 6, wherein: the sealing piece is arranged on the hot end radial partition plate through a fixing bolt penetrating through the kidney-shaped hole, a hot end radial arc sealing device of the air preheater and a hot end sector plate of the air preheater form a sealing pair, and the length direction of the sealing piece is consistent with the radial length of a rotor of the air preheater;
the fixing bolt simultaneously penetrates through the sealing sheet, the fixing clamping plate and the waist-shaped hole in the wrapping sheet and is locked by a nut; the part is provided with a first driving clamping plate, and a fixing bolt simultaneously penetrates through the sealing plate, the first driving clamping plate and a waist-shaped hole in the wrapping sheet and is incompletely locked through a nut; and the fixing bolt simultaneously penetrates through the sealing plate, the second driving clamping plate and the waist-shaped hole in the wrapping sheet and is incompletely locked through a nut.
8. The mounting structure according to claim 7, wherein: corresponding ball mounting holes are uniformly distributed on the peripheries of corresponding waist-shaped holes in the sealing sheet, the driving clamping plate and the wrapping sheet, the sealing sheet, the driving clamping plate and the wrapping sheet form a group of ball mounting holes, the aperture of the ball mounting holes on the outer sides of the sealing sheet and the wrapping sheet is smaller than the diameter of the balls, more than 3 groups of ball mounting holes are distributed on the periphery of each waist-shaped hole, one ball is arranged in each group of ball mounting holes, and the two sides of each ball respectively exceed the sealing sheet and the wrapping sheet by 0.25-0.75 mm; the driving clamping plate comprises a first driving clamping plate and a second driving clamping plate.
9. The mounting structure according to claim 8, wherein: more than 4 groups of ball mounting holes are uniformly distributed on the periphery of each kidney-shaped hole.
10. The mounting structure according to any one of claims 7 to 9, wherein: the air preheater is characterized by further comprising a limiting piece, a long-strip limiting hole is formed in the limiting piece, the limiting piece is located in the last waist-shaped hole of the hot end radial arc-shaped sealing device terminal of the air preheater, the fixing bolt sequentially penetrates through the long-strip limiting holes in the sealing piece, the wrapping piece and the limiting piece and then is fixed through the nut, and the limiting piece is welded on the wrapping piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121561017.6U CN215257810U (en) | 2021-07-09 | 2021-07-09 | Radial arc sealing device of air preheater hot junction and mounting structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121561017.6U CN215257810U (en) | 2021-07-09 | 2021-07-09 | Radial arc sealing device of air preheater hot junction and mounting structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215257810U true CN215257810U (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121561017.6U Active CN215257810U (en) | 2021-07-09 | 2021-07-09 | Radial arc sealing device of air preheater hot junction and mounting structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215257810U (en) |
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2021
- 2021-07-09 CN CN202121561017.6U patent/CN215257810U/en active Active
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