CN214950771U - Flexible tube plate structure for coping with tube shell pass pressure difference and corresponding waste heat boiler - Google Patents

Abstract

The utility model relates to the technical field of heat exchange equipment, in particular to a flexible tube plate structure for dealing with tube pass pressure difference and a corresponding waste heat boiler, which comprises an inlet tube box, an outlet tube box and a shell pass cylinder body, wherein the flexible tube plate structure comprises a thin tube plate and a plurality of support plates which are arranged in parallel, each support plate comprises a plate body and a plurality of pull rods, the thin tube plate is provided with a plurality of rows of support holes, and the pull rods penetrate into the support holes of the corresponding rows and are welded and fixed through a counter bore welding mode; a plurality of reinforcing plates are welded and fixed on every two adjacent supporting plates; the support plate is used for supporting the support plate. Compare and have now with many lacing wires intensive welding technique respectively, the utility model discloses can arrange the welding with each backup pad, reduce the manufacturing degree of difficulty. Each row of pull rods are connected into a whole by plate bodies, so that the integral strength is higher, and a more effective strengthening effect is provided for the thin tube plate. The axial channel of the shell pass space is not blocked by the thick tube plate, so that the axial flux of the cooling water in the shell pass is increased, and the heat exchange effect is improved.

Description

Flexible tube plate structure for coping with tube shell pass pressure difference and corresponding waste heat boiler

Technical Field

The utility model relates to a indirect heating equipment technical field that is arranged in fields such as petroleum refining and chemical industry, coal chemical industry, concretely relates to reply have flexible tube sheet structure and the waste heat boiler that corresponds of tube journey pressure differential.

Background

In the fields of petroleum refining, chemical industry, coal chemical industry and the like, the research on energy-saving technology is increasing day by day, and a heat exchanger is the most common and most applied equipment in the work of recovering heat energy. The joint of the tube plate and the heat exchange tube of the heat exchanger is the most core part of the whole heat exchanger and also the weakest part, and a large number of failures of the heat exchanger occur at the part. Waste heat boilers are a common type of heat exchanger.

Because the traditional tube plate has larger thickness, the heat transfer is slow in the thickness direction, the temperature gradient is large, the stress concentration and other adverse factors on equipment use easily cause the damage of the joint of the heat exchange tube and the tube plate, and the heat exchange tube becomes the main weak part of the heat exchanger. The tube plate is too thick, so that a gap between the tube hole on the tube plate and the heat exchange tube is too large, salt substance concentration and scaling can occur in the gap, and scaling corrosion can be generated. Under the high temperature condition, the thick tube plate heat exchanger is difficult to ensure the long-period operation of the equipment.

The thin tube plate effectively reduces the temperature difference of the tube plate, and can effectively avoid the damage of the connection part of the heat exchange tube and the tube plate and the equipment failure caused by the cracking of the tube plate. However, under the condition of large-scale high pressure and high temperature, especially under the working condition of large pressure difference of tube shell pass, the tube plate part of the thin tube plate waste heat boiler can deform greatly due to the pressure difference of the tube shell pass, and the joint of the tube plate and the heat exchange tube is easy to lose efficacy.

The utility model provides a chinese patent number is CN201720412001.6 from this, and the name is the technique of "a double tube sheet combination formula rapid cooling boiler for coal industry", through setting up the mode that thin tube sheet and thick tube sheet combined together, through intensive taut welded fastening between thin tube sheet and the thick tube sheet. The thin tube plate can absorb partial thermal expansion due to elastic deformation, and has good heat conduction effect, so that the temperature difference between two sides of the thin tube plate is small, thereby reducing the thermal stress of the tube plate in working and enhancing the cooling effect; in addition, the thin tube plate and the thick tube plate are connected into a whole by the lacing wires, the thin tube plate is strengthened, the thin tube plate is not easy to deform and keeps in a plane state, the fixed connection position of the thin tube plate and the shell does not bear bending alternating load, and the thin tube plate can bear larger pressure.

From the above, on the one hand: because the thin tube plates and the thick tube plates are welded and fixed in a large number of densely arranged modes, the welding and fixing difficulty is high, and the fillet welding is adopted between the lacing wires and the thick tube plates, so that the fixing strength is low; on the other hand, due to the existence of the thick tube plate and the dense distribution of the tie bars, the axial channel of the shell pass space is blocked by the thick tube plate, and although a gap is reserved between the tube hole of the thick tube plate and the heat exchange tube, the flow of cooling water in the shell pass space is still limited to a great extent, and the heat exchange effect is influenced.

SUMMERY OF THE UTILITY MODEL

There is above-mentioned technical problem to prior art, the utility model provides a reply has flexible tube sheet structure of shell journey pressure differential and corresponding exhaust-heat boiler, and it is convenient for weld, has increased the axial flux of cooling water at the shell journey, improves the heat transfer effect.

In order to achieve the above object, the utility model provides a following technical scheme:

the flexible tube plate structure for coping with tube shell pass pressure difference comprises a thin tube plate and a plurality of support plates which are arranged in parallel, wherein each support plate comprises a plate body and a plurality of pull rods, the pull rods are arranged on the side part, close to the thin tube plate, of the plate body, the thin tube plate is provided with a plurality of rows of support holes, and the pull rods of the support plates penetrate through the support holes in the corresponding rows and are welded and fixed through counter bores;

A plurality of reinforcing plates are welded and fixed between every two adjacent supporting plates; the improved flexible tube plate structure also comprises a baffle ring used for limiting the supporting plate.

Preferably, the side part of the plate body is provided with a step, and the inner side of the baffle ring is matched with one side surface of the step so as to limit the supporting plate in the radial direction; the end face of the baffle ring is matched with the other side face of the step, and an expansion gap exists between the end face of the baffle ring and the other side face of the step, so that when the thin plate pipe is flexibly deformed to drive the supporting plate to move, the baffle ring axially limits the stroke of the moving supporting plate.

Preferably, the step of the plate body is arranged on one side close to the thin tube plate, so that the baffle ring can limit the stroke of the support plate towards the direction close to the thin tube plate, and the baffle plate is suitable for occasions where the shell-side pressure is greater than the tube-side pressure;

or the steps of the plate body are arranged on one side far away from the thin tube plate, so that the baffle ring can limit the stroke of the support plate towards the direction far away from the thin tube plate, and the baffle plate is suitable for occasions where the tube side pressure is greater than the shell side pressure;

or steps are arranged on two sides of the plate body far away from and close to the thin tube plate, so that the baffle ring can limit the stroke of the support plate in the direction far away from and close to the thin tube plate, and the baffle plate is suitable for occasions where either tube side pressure or shell side pressure is large.

Further preferably, the reinforcing plate is an elongated plate body, and the reinforcing plate is inserted and welded between two adjacent supporting plates.

Further preferably, the plate body and the pull rod of each support plate are of an integrated structure.

Preferably, the support hole is a circular hole, and the pull rod is a circular rod body matched with the support hole.

Preferably, the plate body is provided with a plurality of slotted holes penetrating through the thickness of the plate body, and the slotted holes are arranged along the width direction and the length direction of the plate body; and/or the reinforcing plate is provided with a plurality of slotted holes penetrating through the thickness of the reinforcing plate, and the slotted holes are arranged along the width direction and the length direction of the reinforcing plate.

It is further preferred that the baffle ring is provided with a plurality of liquid through holes arranged around the axis of the baffle ring.

The waste heat boiler with the flexible tube plate structure comprises an inlet tube box, an outlet tube box and a shell side cylinder, wherein a plurality of heat exchange tubes are arranged in the shell side cylinder, the thin tube plates are connected with the inlet tube box, the baffle rings are fixedly welded with the inner wall of the shell side cylinder, and one ends of the heat exchange tubes penetrate between two adjacent supporting plates and are further communicated with the inlet tube box through the thin tube plates; the shell pass cylinder is also provided with a rear tube plate, and the other end of the heat exchange tube penetrates through the rear tube plate and is communicated with an outlet tube box.

Further preferably, the plurality of reinforcing plates between every two adjacent supporting plates are arranged along the width direction of the supporting plates: the plurality of heat exchange tubes are arranged in a rectangular manner in a vertically and horizontally aligned manner, and the reinforcing plate and the supporting plate are arranged vertically to each other; or the heat exchange tubes are distributed in a triangular manner in a staggered manner in adjacent rows, the reinforcing plates are obliquely arranged relative to the supporting plate, and the oblique directions of the two adjacent rows of reinforcing plates are the same or opposite.

The utility model has the advantages that:

the utility model discloses a reply has flexible tube sheet structure and the waste heat boiler that corresponds of tube journey pressure differential compares with prior art, has following effect:

1) because the supporting plate is arranged to reinforce the thin tube plate, the thickness of the thin tube plate can be thinner than that of the traditional tube plate, the connection structure of the heat exchange tube and the thin tube plate is easier to realize full-penetration deep hole welding, the quality of a tube head is ensured, and the problems of high-temperature failure and gap corrosion of the connection welding seam of the heat exchange tube and the thick tube plate are avoided;

2) the supporting plate is combined with the baffle ring, so that the strength of the thin tube plate can be enhanced, and the thin tube plate is prevented from generating great bending deformation in the use process to cause the failure of equipment;

3) the connection of the supporting plates and the reinforcing plates can avoid the problems of instability and the like of the supporting plates along the arrangement direction;

4) The thin tube plates are connected by welding through the supporting plates, and the baffle rings which are not easy to deform connect the thin tube plates into a whole through the supporting plates with higher rigidity, so that the strength of the thin tube plates is enhanced, and the deformation of the thin tube plates is prevented;

5) compared with the prior art of respectively intensively welding a plurality of tie bars, the utility model can arrange and weld all the supporting plates, is convenient for welding operation, and reduces the manufacturing difficulty;

6) each row of pull rods are connected into a whole by plate bodies, so that the integral strength is higher, and a more effective strengthening effect is provided for the thin tube plate;

7) because the thick tube plate in the prior art is cancelled, the axial channel of the shell pass space is not blocked by the thick tube plate, thereby increasing the axial flux of the cooling water in the shell pass and improving the heat exchange effect.

Drawings

Fig. 1 is a schematic structural view of a waste heat boiler in an embodiment.

Fig. 2 is a detailed structural diagram at I in the figure.

Fig. 3 is a sectional view taken in the direction H-H in fig. 2.

Fig. 4 is a schematic view of a support plate in an embodiment.

Fig. 5 is another visual schematic diagram of fig. 4.

FIG. 6 is a schematic view of a row of reinforcing plates in an embodiment.

Fig. 7 is a schematic view of a rectangular tube arrangement manner of a plurality of heat exchange tubes in the embodiment, and the view angle is the direction a of fig. 2.

Fig. 8 is a schematic view of the arrangement of the supporting plate and the reinforcing plate in fig. 7, wherein the view is in the direction B of fig. 2.

Fig. 9 is a schematic view of a triangular tube distribution manner of a plurality of heat exchange tubes in the embodiment, and the view angle is the direction a of fig. 2.

Fig. 10 is a schematic view of the arrangement of the supporting plate and the reinforcing plate in fig. 9, wherein the view is in the direction B of fig. 2.

Fig. 11 is a schematic view of another arrangement of the supporting plate and the reinforcing plate on the basis of fig. 9, wherein the view is in the direction B of fig. 2.

FIG. 12 is a schematic view of example 2, in which the reinforcing plate is schematically shown.

FIG. 13 is a schematic view of example 3, in which the reinforcing plate is schematically shown.

Reference numerals:

the device comprises an inlet tube box 1, an improved flexible tube plate structure 2, a shell-side cylinder 3, a rear tube plate 4, an outlet tube box 5, a thin tube plate 6, a supporting plate 7, a reinforcing plate 8, a baffle ring 9, a heat exchange tube 10, a supporting hole 11, a pull rod 12, a plate body 13, a slotted hole 14, a liquid through hole 15, an expansion gap 16 and a step 17.

Detailed Description

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

Example 1

One embodiment of the waste heat boiler of the present invention, as shown in fig. 1 to 11, includes an inlet tube box 1, an outlet tube box 5 and a shell side cylinder 3, wherein the end of the shell side cylinder 3 near the inlet tube box 1 is provided with an improved flexible tube plate structure 2, the improved flexible tube plate structure 2 includes a thin tube plate 6 and a plurality of support plates 7 arranged in parallel along the radial direction of the shell side cylinder 3, each support plate 7 includes a plate body 13 and a plurality of pull rods 12 of an integrated structure, and the plurality of pull rods 12 are arranged on the side portion of the plate body 13 near the thin tube plate 6; the thin tube plate 6 is provided with a plurality of rows of support holes 11, a plurality of pull rods 12 of the support plate 7 are inserted into the corresponding rows of support holes 11 and are welded and fixed in a counter bore welding mode, the support holes 11 are round holes after welding, and the pull rods 12 are round rod bodies matched with the support holes 11. The thin tube plate 6 is relatively thin, the thickness of the thin tube plate 6 needs to meet the flexible deformation requirement, the thin tube plate 6 is reinforced by the supporting plate 7, so that the thickness of the thin tube plate 6 can be thinner compared with the traditional tube plate, the thin tube plate 6 is connected by the pull rod 12 of the supporting plate 7 in a welding mode, the thin tube plate 6 is connected into a whole by the baffle ring 9 which is not easy to deform through the supporting plate 7 with higher rigidity, the strength of the thin tube plate 6 is enhanced, the thin tube plate 6 is prevented from deforming, and the problems that the supporting plates 7 are unstable in the arrangement direction and the like are solved. Moreover, compare present with many lacing wires intensive welding technique respectively, this embodiment can arrange the welding with each backup pad 7, and welding operation is convenient, reduces the manufacturing degree of difficulty.

For strengthening the intensity of polylith backup pad 7 in the array orientation, welded fastening has polylith reinforcing plate 8 between every two piece adjacent backup pads 7, and this polylith reinforcing plate 8 is arranged along backup pad 7's width direction, so polylith backup pad 7 and polylith reinforcing plate 8 become a whole each other. The reinforcing plate 8 is a strip-shaped plate body 13, and the reinforcing plate 8 is inserted and welded between every two adjacent supporting plates 7 one by one. In practice, the arrangement of the plurality of reinforcing plates 8 can be varied according to the arrangement of the plurality of heat exchange tubes 10: as for the rectangular tube arrangement in the manner of longitudinal and lateral alignment of the plurality of heat exchange tubes 10 as shown in fig. 7, the reinforcing plate 8 and the support plate 7 are arranged in a cross shape perpendicular to each other as shown in fig. 8; while the plurality of heat exchange tubes 10 shown in fig. 9 are arranged in a triangular manner with adjacent rows staggered, the reinforcing plates 8 are arranged obliquely relative to the support plate 7, and the inclination directions of the two adjacent rows of reinforcing plates 8 may be inclined in the same direction as shown in fig. 10 or in the opposite directions in sequence as shown in fig. 11.

Two baffle rings 9 are fixedly welded on the inner wall of the shell-side cylinder 3, L-shaped steps 17 are arranged on the left and right sides of the side part, close to the shell-side cylinder 3, of the supporting plate 7, and the inner sides of the baffle rings 9 are matched with the radial side faces of the steps 17 so as to limit the supporting plate 7 in the radial direction; the end face of the retaining ring 9 is matched with the axial side face of the step 17, and an expansion gap exists between the end face of the retaining ring and the axial side face, so that when the thin plate pipe is flexibly deformed to drive the supporting plate 7 to move, the retaining ring 9 axially limits the stroke of the moved supporting plate 7. When the temperature exists, the supporting plate 7 expands and extends, when the expansion is not synchronous with the extension of the shell-side cylinder 3, an expansion gap 16 needs to be reserved between the supporting plate 7 and the retaining ring 9, for example, when the pressure of the tube side is high, the supporting plate 7 has the tendency of moving towards the right side, and therefore the expansion gap 16 can be reserved between the supporting plate 7 and the retaining ring 9 on the left side. On the contrary, when the shell side pressure is high, the supporting plate 7 tends to move to the left, so that some expansion gap 16 can be reserved between the supporting plate 7 and the right baffle ring 9. The supporting plate 7 is combined with the baffle ring 9, so that the strength of the thin tube plate 6 can be enhanced, and the thin tube plate 6 is prevented from generating great bending deformation in the using process to cause failure of equipment. Because the thin tube plate 6 can be strengthened by the support plate 7 and the baffle ring 9, a thick tube plate in the prior art can be eliminated, and an axial channel of a shell pass space is not blocked by the thick tube plate, so that the axial flux of cooling water on the shell pass is increased, and the heat exchange effect is improved. The reinforcing plate 8 closest to the inner wall of the shell-side cylinder 3 is also provided with a step 17, the matching relation between the step 17 and the baffle ring 9 is the same as the matching relation between the step 17 of the supporting plate 7 and the baffle ring 9, and thus, the baffle ring 9 can more uniformly, stably and reliably limit the whole body formed by the supporting plate 7 and the reinforcing plate 8.

A plurality of heat exchange tubes 10 which are arranged in parallel are arranged in the shell-side barrel 3, the thin tube plate 6 is connected with the inlet tube box 1, one end of each heat exchange tube 10 penetrates between two adjacent support plates 7 and is further communicated with the inlet tube box 1 through the thin tube plate 6, and a connection structure for welding the heat exchange tubes 10 and the thin tube plate 6 is adopted, so that full-penetration deep hole welding is easier to realize and the tube head quality is ensured compared with the traditional connection structure for connecting the heat exchange tubes 10 and a thicker tube plate; compared with a traditional connection structure of a thick tube plate and a heat exchange tube 10, the full-penetration deep-hole welding structure of the thin tube plate 6 avoids the problems of high-temperature failure and gap corrosion of a connection welding seam of the heat exchange tube 10 and the thick tube plate. The shell-side barrel 3 is also provided with a rear tube plate 4, and the other end of the heat exchange tube 10 is communicated with an outlet tube box 5 after passing through the rear tube plate 4.

In this embodiment, the plate body 13 and the reinforcing plate 8 are both provided with a plurality of oval slots 14 penetrating the thickness of the plate body, and the slots 14 are arranged along the width and length directions of the plate body 13 and the reinforcing plate 8, so that the shell-side cooling water can flow rapidly and uniformly, and high-temperature failure of the equipment due to high-temperature dead corners is prevented.

Example 2

The second embodiment of the waste heat boiler of the present invention, as shown in fig. 12, is the same as the main technical solution of embodiment 1 in this embodiment, and the technical features not explained in this embodiment are explained by embodiment 1, and the description is not repeated here, and this embodiment and embodiment 1 are different in that the shell pass cylinder 3 is only provided with a retaining ring 9, the step 17 of the plate body 13 is disposed on one side of the thin tube plate 6, and the stroke of the support plate 7 moving leftward is limited in the axial direction, so that the present invention is suitable for the use environment with large shell pass pressure.

In the embodiment, the baffle ring 9 is provided with a plurality of liquid through holes 15 arranged around the axis of the baffle ring, so that the shell-side cooling water can flow quickly and uniformly, and high-temperature dead angles are prevented from causing high-temperature failure of equipment. The liquid passage holes 15 are also applicable to the retainer ring 9 of embodiment 1.

Example 3

The utility model discloses a third of waste heat boiler's concrete implementation mode, it is shown in combination with fig. 13, this embodiment is the same with embodiment 2's main technical scheme, and the technical feature who does not explain in this embodiment adopts embodiment 2 to explain, does not do the repetition here, and this embodiment and embodiment 2's difference lie in, and the step 17 setting of plate body 13 is in the one side of keeping away from thin tube sheet 6, restricts the stroke that backup pad 7 moved to the right in the axial, is applicable to the big service environment of tube side pressure.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A flexible tube plate structure for dealing with tube-to-tube process pressure difference is characterized in that: the support plate comprises a thin tube plate and a plurality of support plates which are arranged in parallel, wherein each support plate comprises a plate body and a plurality of pull rods, the pull rods are arranged on the side part, close to the thin tube plate, of the plate body, the thin tube plate is provided with a plurality of rows of support holes, and the pull rods of the support plates penetrate through the support holes of the corresponding rows and are welded and fixed through counter bores;

a plurality of reinforcing plates are welded and fixed between every two adjacent supporting plates; the flexible tube sheet structure further comprises a baffle ring for limiting the supporting plate.

2. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 1 wherein: the side part of the plate body is provided with a step, and the inner side of the baffle ring is matched with one side surface of the step so as to limit the radial direction of the supporting plate; the end face of the baffle ring is matched with the other side face of the step, and an expansion gap exists between the end face of the baffle ring and the other side face of the step, so that when the thin plate pipe is flexibly deformed to drive the supporting plate to move, the baffle ring axially limits the stroke of the moving supporting plate.

3. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 2 wherein: the step of the plate body is arranged at one side close to the thin tube plate, so that the baffle ring can limit the stroke of the support plate towards the direction close to the thin tube plate, and the baffle plate is suitable for occasions where the shell side pressure is greater than the tube side pressure;

Or the steps of the plate body are arranged on one side far away from the thin tube plate, so that the baffle ring can limit the stroke of the support plate towards the direction far away from the thin tube plate, and the baffle plate is suitable for occasions where the tube side pressure is greater than the shell side pressure;

or steps are arranged on two sides of the plate body far away from and close to the thin tube plate, so that the baffle ring can limit the stroke of the support plate in the direction far away from and close to the thin tube plate, and the baffle plate is suitable for occasions where either tube side pressure or shell side pressure is large.

4. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 1 wherein: the reinforcing plate is a strip-shaped plate body, and the reinforcing plate is inserted and welded between the two adjacent supporting plates.

5. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 1 wherein: the plate body and the pull rod of each supporting plate are of an integrated structure.

6. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 1 wherein: the supporting holes are circular holes, and the pull rod is a circular rod body matched with the supporting holes.

7. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 1 wherein: the plate body is provided with a plurality of slotted holes penetrating through the thickness of the plate body, and the slotted holes are arranged along the width direction and the length direction of the plate body; and/or the reinforcing plate is provided with a plurality of slotted holes penetrating through the thickness of the reinforcing plate, and the slotted holes are arranged along the width direction and the length direction of the reinforcing plate.

8. A flexible tube sheet construction to cope with tube-to-tube differential pressure as set forth in claim 1 wherein: the baffle ring is provided with a plurality of liquid through holes arranged around the axis of the baffle ring.

9. A waste heat boiler having a flexible tube sheet construction for handling tube-to-tube differential pressure as claimed in any one of claims 1 to 8, characterized in that: the heat exchange tube comprises an inlet tube box, an outlet tube box and a shell pass cylinder, wherein a plurality of heat exchange tubes are arranged in the shell pass cylinder, a thin tube plate is connected with the inlet tube box, a baffle ring is welded and fixed with the inner wall of the shell pass cylinder, and one end of each heat exchange tube penetrates between two adjacent supporting plates and is further communicated with the inlet tube box through the thin tube plate; the shell pass cylinder is also provided with a rear tube plate, and the other end of the heat exchange tube penetrates through the rear tube plate and is communicated with an outlet tube box.

10. Waste heat boiler according to claim 9, characterized in that: the polylith reinforcing plate between every two adjacent backup pads is arranged along backup pad width direction: the plurality of heat exchange tubes are arranged in a rectangular manner in a vertically and horizontally aligned manner, and the reinforcing plate and the supporting plate are arranged vertically to each other; or the heat exchange tubes are distributed in a triangular manner in a staggered manner in adjacent rows, the reinforcing plates are obliquely arranged relative to the supporting plate, and the oblique directions of the two adjacent rows of reinforcing plates are the same or opposite.

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