CN215981204U - Variable spring support and hanger for power station boiler tail flue - Google Patents

Abstract

The utility model discloses a variable spring hanger for a power station boiler tail flue, which comprises: a spring support and hanger body; the upper end of the limiting rod is fixed on the spring pressing plate of the spring support hanger body, the lower end of the limiting rod is suspended, the limiting rod penetrates through the cylindrical spring of the spring support hanger body, and when the cylindrical spring is compressed to a preset distance threshold value, the lower end of the limiting rod abuts against the bottom of the shell of the spring support hanger body. The utility model has the advantages that when the dust load of the flue reaches the load value of the cylindrical spring generated by thermal displacement, the limiting rod is abutted against the bottom of the shell, so that the variable elastic support is converted into the rigid support, and the dangerous situation that expansion joints are torn due to insufficient expansion amount of expansion joints connected with the flue is avoided.

Description

Variable spring support and hanger for power station boiler tail flue

Technical Field

The utility model relates to the technical field of spring support and suspension application improvement. More particularly, the present invention relates to a variable spring hanger for a utility boiler tail flue.

Background

In the past, the flue system of the power station boiler has small section change and relatively simple trend, and a spring support hanger is not required to absorb displacement in the height direction, so that the flue support hanger is mostly a rigid support hanger; however, with the increasingly strict national environmental requirements, the boiler tail flue gas denitration system becomes an indispensable important system in a modern thermal power plant, the tail flue also changes from the past simple trend of connecting an economizer ash hopper and an air preheater into an irregular trend flue which needs to pass through systems such as a denitration Ammonia Injection Grid (AIG), a denitration static mixer, a denitration reactor and the like, and in some L-shaped flue sections, the Z-shaped flue sections and the flue sections with large inclined span need to be provided with spring support hangers to absorb the height displacement difference on the support hangers at different positions on the same section of flue.

The conventional variable spring support and hanger absorbs vertical thermal displacement by utilizing spring compression and supports a flue by utilizing elastic counterforce generated by spring deformation, thereby playing a role of a support and hanger; however, because the load of the horizontal section of the boiler tail flue continuously increases along with the increase of the accumulated dust, if the conventional spring support and hanger is directly used as a flue support, when the accumulated dust load increases to exceed the load value of a spring generated by thermal displacement, the flue may continuously move downwards, so that the expansion amount of an expansion joint connected with the flue is insufficient, the expansion joint is in danger of being torn, and even the flue is deformed, pulled and cracked and leaked.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

The utility model also aims to provide a variable spring support and hanger for a tail flue of a power station boiler, when the ash accumulation load of the flue reaches the load value of a cylindrical spring generated by thermal displacement, a limiting rod is abutted against the bottom of a shell, so that a variable elastic support is converted into a rigid support, and the dangerous situation that expansion joints of expansion joints connected with the flue are torn due to insufficient expansion amount is avoided.

To achieve these objects and other advantages in accordance with the purpose of the utility model, there is provided a variable spring hanger for a back pass of a utility boiler, comprising:

a spring support and hanger body;

the upper end of the limiting rod is fixed on the spring pressing plate of the spring support hanger body, the lower end of the limiting rod is suspended, the limiting rod penetrates through the cylindrical spring of the spring support hanger body, and when the cylindrical spring is compressed to a preset distance threshold value, the lower end of the limiting rod abuts against the bottom of the shell of the spring support hanger body.

Preferably, the spring pressing plate is provided with a first screw hole, the limiting rod is a threaded rod, the limiting rod is in threaded connection with the first screw hole, and fastening nuts are arranged on two sides of the limiting rod.

Preferably, the limiting plate of the spring support and hanger body is annular, and two sides of the limiting plate are fixed on the side wall of the shell and are positioned above the spring pressing plate.

Preferably, the method further comprises the following steps:

at least one pair of guide rails, each pair of guide rails being oppositely disposed on the side wall of the housing;

the spring pressing plate comprises a circular plate and convex plates symmetrically arranged on the circumferential direction of the circular plate, and the convex plates stretch into the guide rail.

Preferably, the limiting plate is provided with a second screw hole, the second screw hole is screwed with an adjusting rod, the lower end of the adjusting rod is provided with a limiting block, the limiting block abuts against the upper surface of the convex plate, and the limiting block extends into the guide track.

Preferably, the guide rails are a pair.

Preferably, the limiting device further comprises a cushion pad, wherein the cushion pad is laid on the lower end face of the limiting rod.

Preferably, the two limiting rods are symmetrically arranged.

Preferably, the side wall of the limiting plate is provided with a plurality of third screw holes along the radial direction;

further comprising:

each pair of fixed blocks is oppositely arranged along the radial direction of the shell, and the fixed blocks are provided with fourth screw holes along the radial direction of the shell;

and the screws are screwed on the fourth screw holes and extend into the shell to be screwed on the third screw holes.

The utility model at least comprises the following beneficial effects:

first, when flue deposition load reached cylindrical spring because of the load value that the thermal displacement produced, the gag lever post was the butt in the casing bottom promptly to make variable elastic support turn into rigid support, avoid the not enough dangerous condition of tearing expansion joint wave node of the expansion volume of the continuous expansion joint of flue.

Second, rotate the gag lever post, can adjust the distance between gag lever post lower extreme and the casing bottom to the biggest vertical thermal displacement value of adaptation different cylindrical spring.

And thirdly, the convex plate and the guide rail are arranged, and the convex plate is limited in the guide rail to move up and down, so that the spring pressing plate can stably move up and down, and the deflection is reduced.

Fourthly, the adjusting rod is rotated, so that the adjusting rod can move up and down, the upper position and the lower position of the limiting block are adjusted, the distance between the spring pressing plate and the bottom of the shell is adjusted, and the spring pressing plate can adapt to the elasticity attribute and the vertical thermal displacement value of different cylindrical springs.

And fifthly, the variable spring support and hanger is applied to a power station boiler tail flue support and hanger system and is used for absorbing thermal expansion displacement in the height direction and supporting a flue.

Sixth, the variable spring support and hanger of the utility model can realize the function conversion of the spring support and hanger and the rigid support and hanger under the condition of the load change of the complex flue system.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a side sectional view of the spring hanger of one embodiment of the present invention;

FIG. 2 is a side sectional view of the spring support hanger in another direction according to one embodiment of the present invention;

FIG. 3 is a detail view of the spring platen of one embodiment of the present invention;

fig. 4 is a detail view of the limiting plate according to one of the technical solutions of the present invention;

fig. 5 is a detailed view of the pipe fixing part according to one embodiment of the present invention;

fig. 6 is a schematic application diagram of the variable spring support hanger according to one embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 6, the present invention provides a variable spring hanger for a tail flue of a utility boiler, comprising:

a spring support and hanger body;

the upper end of the limiting rod 8 is fixed on the spring pressing plate 3 of the spring support and hanger body, the lower end of the limiting rod 8 is suspended, the limiting rod 8 penetrates through the cylindrical spring 4 of the spring support and hanger body, and when the cylindrical spring 4 is compressed to a preset distance threshold value, the lower end of the limiting rod 8 abuts against the bottom of the shell 1 of the spring support and hanger body.

In the above technical solution, the spring support and hanger body at least comprises a casing 1, a position-limiting plate 2 fixed on the upper position of the side wall of the casing 1, a spring pressing plate 3 located below the position-limiting plate 2, a cylindrical spring 4 with the top fixed on the spring pressing plate 3, a boom 5 passing through the cylindrical spring 4 and the spring pressing plate 3, a pipe fixing part 6 fixed at the lower end of the boom 5, and a lifting lug 7 fixed on the top of the casing 1, wherein the upper end of the boom 5 is fixed on the spring pressing plate 3, the lower end thereof slides out of the bottom of the casing 1, the upper and lower distance limited between the position-limiting plate 2 and the bottom of the casing 1 can accommodate the cylindrical spring 4, and the maximum vertical thermal displacement corresponding to the cylindrical spring 4 is left, the lifting lug 7 is fixed on a beam, after the pipe fixing part 6 is fixed on the pipe, the cylindrical spring 4 moves downwards under the pressure of the spring pressing plate 3, until the force balance position is reached, the boiler tail flue can generate heat to cause the spring to generate thermal displacement, the boiler tail flue can accumulate dust continuously, the load of the boiler tail flue can increase along with the increase of the accumulated dust continuously, and when the load value generated by the thermal displacement of the spring is exceeded, the flue can move downwards continuously to cause the danger that the expansion joint connected with the flue is not enough in expansion amount and the expansion joint is torn, and even the flue is deformed, pulled and cracked and leaked. This application is through setting up gag lever post 8 in cylindrical spring 4, and when the flue deposition load reached a value, the spring was because of the load value that the thermal displacement produced promptly, gag lever post 8 butt in 1 bottom of casing promptly to support from variable elasticity and turn into the rigidity and support, thereby avoid the emergence of above-mentioned dangerous condition.

In another technical scheme, a first screw hole 82 is formed in the spring pressing plate 3, the limiting rod 8 is a threaded rod, the limiting rod 8 is screwed to the first screw hole 82, and fastening nuts 81 are arranged on two sides of the limiting rod 8. The distance between the lower end of the limiting rod 8 and the bottom of the shell 1 can be adjusted by rotating the limiting rod 8, so that the maximum vertical thermal displacement value of different cylindrical springs 4 is adapted.

In another technical scheme, a limiting plate 2 of the spring support and hanger body is annular, and two sides of the limiting plate 2 are fixed on the side wall of the shell 1 and are located above the spring pressing plate 3. The annular shape allows the spring platen 3 to be restrained from multiple angles and the forces are more balanced.

In another technical solution, the method further comprises:

at least one pair of guide rails 9, wherein each pair of guide rails 9 is oppositely arranged on the side wall of the shell 1;

the spring pressing plate 3 comprises a circular plate 31 and convex plates 32 symmetrically arranged on the circumference of the circular plate 31, and the convex plates 32 extend into the guide track 9.

In the above technical solution, the spring pressing plate 3 can move up and down stably and reduce deflection by arranging the convex plate 32 and the guide rail 9 and limiting the convex plate 32 to move up and down in the guide rail 9.

In another technical scheme, a second screw hole 21 is formed in the limiting plate 2, an adjusting rod 22 is screwed on the second screw hole 21, a limiting block 23 is arranged at the lower end of the adjusting rod 22, the limiting block 23 abuts against the upper surface of the convex plate 32, and the limiting block 23 extends into the guide track 9.

In the above technical solution, the adjusting rod 22 is rotated to move the adjusting rod 22 up and down, so as to adjust the up and down position of the limiting block 23, and adjust the distance between the spring pressing plate 3 and the bottom of the casing 1, so as to adapt to the elastic property and the vertical thermal displacement value of different cylindrical springs 4.

In another solution, the guide rails 9 are a pair. The pair of guide rails 9 can play a role in stable guiding, so that excessive arrangement is not needed, and resource waste is reduced.

In another technical scheme, the device further comprises a cushion pad, wherein the cushion pad is laid on the lower end face of the limiting rod 8. Because the weight of pipeline is not last, set up the blotter and be favorable to protecting casing 1 and gag lever post 8.

In another technical scheme, the two limiting rods 8 are symmetrically arranged. Two limiting rods 8 are symmetrically arranged, so that the supporting balance stability during the rigid support is improved.

In another technical scheme, a plurality of third screw holes are formed in the side wall of the limiting plate 2 along the radial direction of the side wall;

further comprising:

at least one pair of fixed blocks 24, wherein each pair of fixed blocks 24 is oppositely arranged along the radial direction of the shell 1, and the fixed blocks 24 are provided with fourth screw holes along the radial direction of the shell 1;

and the screws 25 are screwed on the fourth screw holes and extend into the shell 1 to be screwed on the third screw holes. The limit plate 2 is fixed by adopting a screw connection mode of the fixing block 24 and the screw 25, and the fixing structure is simple and firm.

The technical scheme can also comprise the following technical details so as to better realize the technical effects:

the pipe fixing part 6 comprises a connecting column 61 which is coaxially and rotatably arranged at the lower end of the suspender 5, a semi-arc-shaped upper hoop 62 fixed on the connecting column 61, and a lower hoop 63 which is spliced into a circular shape by the upper hoop 62, wherein the upper hoop 62 and the end part of the lower hoop 63 are both provided with a connecting lug 64, and the connecting lug 64 is fixed through a bolt. Through the setting of above-mentioned structure, spliced pole 61 rotates, can adjust the fixed part that goes up hoop 62 and hoop 63 concatenation formation down and adapt to different angles and lay the flue, can dismantle the last hoop 62 and the hoop 63 of connecting and make things convenient for the branch of flue to hang and disassemble.

Fig. 6 shows an application of the modified spring support hanger in the flue support hanger system, which is described in detail as follows:

the spring hanger 100 of this example is applied to the exit flue of the economizer, and the exit flue of the economizer is an "L" shaped flue 10, because the process needs and the steel frame condition limits, the expansion dead point of the whole section of flue 10 in the height direction can only be arranged at the connection position. The horizontal section of the flue 10 also needs to be supported by a support and hanger, but because the height can not be at the same elevation, the expansion displacement can be generated when the temperature rises, and the rigid support and hanger 200 can limit the expansion of the flue 10, so the horizontal section support and hanger can only be supported by the spring support and hanger 100 and can absorb the expansion displacement. Rigid supports 200 are provided in the vertical section of the flue 10 because the vertical section has no expansion effect.

Because the load of the economizer flue 10 is composed of the structural load and the ash load, and the ash load is continuously increased along with the operation time, the hanging bracket structure is adopted to avoid that the ash load exceeds the elastic counter force of the cylindrical spring 4 after being overlarge, so that the cylindrical spring 4 is continuously compressed, and the flue 10 is continuously sunk and deformed. The limiting rod 8 is contacted with the bottom plate of the shell 1 after the cylindrical spring 4 is compressed to a positioning position, and plays a rigid supporting role for the suspender 5, and the spring support hanger 100 is converted into a rigid support hanger. When the ash load is unloaded or the boiler is shut down and the temperature of the flue 10 is reduced to normal temperature, the flue 10 can retract upwards, the spring support and hanger 100 can rebound to an installation state due to load reduction or heat displacement of the flue 10, and the effect of a conventional spring support and hanger is achieved at the moment.

The significance of the utility model lies in that the reformed spring support hanger 100 is applied to a support hanger system of the boiler tail flue 10, which not only can solve the problem of the support hanger of the flue 10 with poor thermal displacement, but also avoids the defect that the deformation of the conventional spring support hanger is changed along with the change of load and the fixing is not caused, thereby solving the problem that the change of the ash load of the flue 10 is uncontrollable.

While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (9)

1. A variable spring gallows for power plant boiler afterbody flue, its characterized in that includes:

a spring support and hanger body;

the upper end of the limiting rod is fixed on the spring pressing plate of the spring support hanger body, the lower end of the limiting rod is suspended, the limiting rod penetrates through the cylindrical spring of the spring support hanger body, and when the cylindrical spring is compressed to a preset distance threshold value, the lower end of the limiting rod abuts against the bottom of the shell of the spring support hanger body.

2. The variable spring hanger for the utility boiler tail flue of claim 1, wherein the spring pressure plate is provided with a first screw hole, the limiting rod is a threaded rod, the limiting rod is screwed on the first screw hole, and fastening nuts are arranged on two sides of the limiting rod.

3. The variable spring hanger for the utility boiler back flue of claim 1, wherein the limiting plate of the spring hanger body is ring-shaped, and two sides of the limiting plate are fixed on the side wall of the shell and above the spring pressing plate.

4. The variable spring hangers and supports for utility boiler back flues of claim 3 further comprising:

at least one pair of guide rails, each pair of guide rails being oppositely disposed on the side wall of the housing;

the spring pressing plate comprises a circular plate and convex plates symmetrically arranged on the circumferential direction of the circular plate, and the convex plates stretch into the guide rail.

5. The variable spring support and hanger for the utility boiler tail flue according to claim 4, wherein a second screw hole is formed in the limiting plate, an adjusting rod is screwed in the second screw hole, a limiting block is arranged at the lower end of the adjusting rod and abuts against the upper surface of the convex plate, and the limiting block extends into the guide track.

6. The variable spring hangers and supports for utility boiler back flues of claim 4 wherein said guide rails are a pair.

7. The variable spring hanger for a utility boiler back flue as claimed in claim 1 further comprising a cushion pad applied to a lower end surface of the restraint bar.

8. The variable spring hangers and supports for utility boiler back flues of claim 1 wherein said stop bars are two and are symmetrically disposed.

9. The variable spring hanger for the utility boiler tail flue according to claim 3, wherein a plurality of third screw holes are formed in the side wall of the limiting plate along the radial direction;

further comprising:

each pair of fixed blocks is oppositely arranged along the radial direction of the shell, and the fixed blocks are provided with fourth screw holes along the radial direction of the shell;

and the screws are screwed on the fourth screw holes and extend into the shell to be screwed on the third screw holes.

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