Sealing structure of fluidized bed heater

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a sealing structure of a fluidized bed heater, a fluidized bed is provided with a window, the heater can enter and exit from the window, the heater comprises a vertically arranged tube plate capable of sealing the window of the fluidized bed and a heat exchange tube row fixed on the inner side of the tube plate, and a plurality of studs are arranged on the outer side of the window. The multiple studs are arranged around the periphery of the window at intervals, attaching parts are reserved between the studs and the edges of the window, the inner circumferential side of the tube plate abuts against the attaching parts, the studs are sleeved with locking nuts and pressing plates, and the locking nuts apply force to the pressing plates so that the pressing plates can press the outer circumferential side of the tube plate. Compared with the prior art, the window is directly sealed by the tube plate, the structure is simple, and the manufacturing cost is reduced. And the stud arranged on the outer side of the window is matched with the locking nut and the pressing plate to lock the tube plate, so that the tube plate and the window are kept sealed. The pressing plate only applies force to the peripheral side of the tube plate, the middle of the tube plate is not affected by the sealing structure, and therefore the inlet header, the outlet header and the heat preservation layer can be conveniently arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a sealing structure of a fluidized bed heater. Background Art

[0002] Fluidized bed heating dryer is a large category of traditional drying equipment, widely used in chemical, petroleum, feed and other industries, suitable for drying various granular, flaky and other materials and heat-sensitive materials. For example, the Chinese patent document with announcement number CN2716777Y discloses a fluidized bed dryer with a built-in heat exchanger, which belongs to the technical field of dryers. It is mainly composed of an upper box, a lower box and a fluidizing section, wherein the upper box includes a feed inlet and an air outlet, the lower box includes a fan, an air inlet and a discharge port, the fluidizing section is connected between the upper and lower boxes, and the built-in heat exchanger is arranged on the fluidizing section. The built-in heat exchanger is divided into several groups, arranged in a horizontal tube bundle form, and arranged in an orderly manner according to the "U"-shaped metal pipes and evenly distributed on the fluidizing section. Each built-in heat exchanger consists of a built-in heat exchanger drum, a built-in heat exchanger steam inlet, a built-in heat exchanger condensate outlet and a steam coil. The steam inlet and condensate outlet of the built-in heat exchanger are both connected to the built-in heat exchanger drum, and the steam coil is arranged vertically on the fluidizing section in a "U" shape. It has the advantages of reducing power consumption, energy consumption, good drying effect, high heat exchange efficiency, small footprint and ideal environmental protection.

[0003] Another example is a Chinese patent document with announcement number CN201497295U that discloses a fluidized bed dryer with a vertical tube bundle heat exchanger. It solves the problems of energy consumption, power consumption, investment and environmental protection in the existing fluidized bed, and achieves the effect of reducing energy consumption, power consumption, investment and environmental pressure. Its structure is as follows: it includes a fluidized bed body, and at least one group of built-in heat exchangers is provided in the fluidizing section of the fluidized bed body. Each group of built-in heat exchangers has a number of metal vertical branches, which form a vertical tube bundle form. On the basis of a fluidized bed dryer of general structural form, several groups of built-in heat exchangers are added to the fluidizing section of a traditional fluidized bed. The coils of the built-in heat exchanger are in the form of a vertical tube bundle. This arrangement has little effect on the fluidization quality and can obtain a larger heat exchange area. Under the same output, the area of ​​the fluidized bed and the volume of the dust removal equipment are reduced, the system occupies a small area and requires less investment. Since the main heat source of the fluidized bed dryer with built-in heat exchanger is the heat provided by the built-in heat exchanger, the steam volume and power consumption of the fluidized bed are relatively low. Compared with the traditional fluidized bed dryer, the operating cost of the system is reduced.

[0004] The inventors have found that for the above vertical tube bundle heat exchanger, its horizontal branch pipe passes through the fluidized bed and connects to the steam drum. Such a structure makes it difficult to achieve sealing between the horizontal branch pipe and the furnace wall, and the sealing structure is complicated, which increases the manufacturing cost. Summary of the invention

[0005] In view of the above technical problems in the prior art, the utility model provides a sealing structure of a fluidized bed heater.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A sealing structure for a fluidized bed heater is provided. The fluidized bed is provided with a window through which the heater can enter and exit. The structure is characterized in that the heater comprises a tube sheet arranged vertically and capable of sealing the window of the fluidized bed, and a heat exchange tube row fixed to the inner side of the tube sheet. A plurality of studs are provided on the outer side of the window. The plurality of studs are arranged in a spaced manner around the periphery of the window. A fitting portion is left between the studs and the edge of the window. The inner peripheral side of the tube sheet abuts against the fitting portion. The studs are sleeved with locking nuts and a pressure plate. The locking nuts apply force to the pressure plate so that the pressure plate presses the outer peripheral side of the tube sheet.

[0008] As a further optional solution, the tube sheet and the window are both polygonal in shape, and a plurality of studs are arranged at intervals along each side of the window.

[0009] As a further optional solution, the pressure plate is in a straight strip shape, each side of the tube sheet corresponds to a pressure plate, and the locking nuts corresponding to the same row of studs jointly lock the pressure plate.

[0010] As a further optional solution, the pressure plate is polygonal, and one pressure plate presses multiple edges of the tube sheet at the same time, and the locking nuts corresponding to each stud jointly lock one pressure plate.

[0011] As a further optional solution, a boss is provided on the outer peripheral side of the window, a plurality of studs stand on the boss, and the side of the boss is positioned in cooperation with the periphery of the tube sheet.

[0012] As a further optional solution, a sealing groove is provided at a position of the inner circumference of the tube sheet corresponding to the fitting portion, and a sealing strip is provided in the sealing groove.

[0013] As a further optional scheme, multiple rows of the heat exchange tubes are arranged horizontally in parallel, and each row of the heat exchange tubes includes multiple branch tubes arranged in parallel, and upper and lower headers respectively connecting the two ends of the multiple branch tubes, each branch tube is arranged longitudinally, and the upper and lower headers are arranged horizontally.

[0014] As a further optional scheme, it also includes an inlet header and an outlet header fixed to the outside of the tube sheet, the ports of the upper headers of the multiple rows of heat exchange tubes are welded and fixed to the tube holes of the tube sheet and connected to the inlet header, and the inlet header is connected to the steam input pipe; the ports of the lower headers of the multiple rows of heat exchange tubes are welded and fixed to the tube holes of the tube sheet and connected to the outlet header, and the outlet header is connected to a drain pipe.

[0015] As a further optional solution, an insulation layer is provided on the outer side of the tube sheet, which wraps the inlet header and the outlet header, and a preset distance is left between the peripheral side of the insulation layer and the peripheral side of the tube sheet so that the pressure plate can press against the outer side of the tube sheet.

[0016] As a further optional solution, a cover plate is arranged on the outer side of the thermal insulation layer, and the cover plate surrounds the thermal insulation layer.

[0017] Beneficial effects of the utility model:

[0018] Compared with the prior art, the sealing structure of the fluidized bed heater of the utility model has the advantages that after the heater is placed in the fluidized bed through the window, the tube sheet directly seals the window to achieve sealing, the structure is simple, and the manufacturing cost is reduced. Moreover, the studs arranged outside the window cooperate with the locking nuts and the pressure plate to lock the tube sheet, so that the tube sheet and the window are sealed. More importantly, the pressure plate only applies force to the outer peripheral side of the tube sheet, and the middle part of the tube sheet is not affected by the sealing structure, so it is convenient to arrange the inlet header, the outlet header and the insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the heater in the embodiment (the insulation layer is not shown).

[0020] Figure 2 It is a schematic structural diagram from another perspective of the heater in the embodiment (the insulation layer is not shown).

[0021] Figure 3 for Figure 2 A zoomed-in view of the circled location.

[0022] Figure 4 Schematic diagram of the fluidized bed window in the embodiment.

[0023] Figure 5 It is a schematic diagram of the heater in the embodiment being placed in the fluidized bed and then sealed and locked.

[0024] Reference numerals:

[0025] Tube sheet 1, tube hole 11, sealing groove 12, sealing strip 13;

[0026] Heat exchange tube row 2, branch tube 21, upper header 22, lower header 23;

[0027] Inlet header 3, steam input pipe 31, outlet header 4, drain pipe 41;

[0028] Stud 5, locking nut 6, pressure plate 7;

[0029] Fluidized bed 8, window 81, laminating portion 82, boss 83;

[0030] Thermal insulation layer 9 and cover plate 10. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] A sealing structure of a fluidized bed heater in this embodiment, the heater is used to cooperate with Figure 4 The fluidized bed 8 shown in the figure is used, and the fluidized bed 8 has a plurality of windows 81. A plurality of heaters can be pushed into the fluidized bed 8 from the plurality of windows 81 to heat and dry the material flowing through the fluidized bed 8; the plurality of heaters can also be pulled out from the windows 81 for cleaning / maintenance. Figures 1 to 5 As shown, the heater includes a vertically arranged tube sheet 1 capable of sealing the window 81 of the fluidized bed 8 and a heat exchange tube row 2 fixed to the inner side of the tube sheet 1. Multiple rows of the heat exchange tube rows 2 are arranged in parallel horizontally. Each row of the heat exchange tube rows 2 includes multiple branch tubes 21 arranged in parallel, and an upper header 22 and a lower header 23 respectively connected to both ends of the multiple branch tubes 21. Each branch tube 21 is arranged in the longitudinal direction, and the upper header 22 and the lower header 23 are arranged in the horizontal direction. The heater also includes an inlet header 3 and an outlet header 4 fixed to the outer side of the tube sheet 1. The ports of the upper headers 22 of the multiple rows of heat exchange tube rows 2 are welded and fixed to the tube holes 11 of the tube sheet 1 and connected to the inlet header 3. The inlet header 3 is connected to the steam input pipe 31; the ports of the lower headers 23 of the multiple rows of heat exchange tube rows 2 are welded and fixed to the tube holes 11 of the tube sheet 1 and connected to the outlet header 4. The outlet header 4 is connected to the drainage pipe 41.

[0033] When in use, low-temperature steam enters the inlet header 3 from the steam input pipe 31, is then divided into each upper header 22, and then is divided downward to each branch pipe 21. The steam is cooled and condensed in the branch pipe 21 through the pipe wall and the dried material in the fluidized bed 8. After condensing into water, it is gathered in the lower header 23 below, and then directly flows to the outlet header 4 and flows out from the drain pipe 41.

[0034] In this embodiment, a plurality of studs 5 are arranged outside the window 81, and the plurality of studs 5 are arranged in a spaced manner around the periphery of the window 81. A fitting portion 82 is left between the studs 5 and the edge of the window 81, and the inner peripheral side of the tube sheet 1 is pressed against the fitting portion 82. Each stud 5 is respectively covered with a locking nut 6 and a pressing plate 7, and the locking nut 6 applies force to the pressing plate 7 so that the pressing plate 7 presses the outer peripheral side of the tube sheet 1. Compared with the prior art, after the heater is placed in the fluidized bed 8 through the window 81, the tube sheet 1 directly seals the window 81 to achieve sealing, which has a simple structure and reduces the manufacturing cost. Moreover, the studs 5 arranged outside the window 81 cooperate with the locking nut 6 and the pressing plate 7 to lock the tube sheet 1, so that the tube sheet 1 and the window 81 are kept sealed.

[0035] In this embodiment, the tube sheet 1 and the window 81 are both in a quadrilateral shape, and a plurality of studs 5 are arranged at intervals along the sides of the window 81. Specifically, the pressing plate 7 is in a straight strip shape, and each side of the tube sheet 1 corresponds to a pressing plate 7, and the locking nuts 6 corresponding to the studs 5 in the same row jointly lock the pressing plate 7. In practice, the pressing plate 7 can be changed to a quadrilateral ring shape, and a pressing plate 7 presses multiple sides of the tube sheet 1 at the same time, and the locking nuts 6 corresponding to the studs 5 jointly lock the pressing plate 7.

[0036] In this embodiment, a boss 83 is provided on the outer peripheral side of the window 81 , and a plurality of studs 5 are welded and stand on the boss 83 , and the side of the boss 83 is pressed against the periphery of the tube sheet 1 for fit and positioning.

[0037] In this embodiment, a sealing groove 12 is provided on the inner circumference of the tube sheet 1 at a position corresponding to the fitting portion 82 , and a sealing strip 13 is provided on the sealing groove 12 . The sealing strip 13 is a soft rubber strip to provide sealing between the tube sheet 1 and the window 81 .

[0038] In this embodiment, an insulation layer 9 is provided on the outer side of the tube sheet 1, and the insulation layer 9 wraps the inlet header 3 and the outlet header 4, and a preset distance is left between the peripheral side of the insulation layer 9 and the peripheral side of the tube sheet 1, so that the pressure plate 7 can press against the outer side of the tube sheet 1. A cover plate 10 is provided on the outer side of the insulation layer 9, and the cover plate 10 surrounds the insulation layer 9. The pressure plate 7 only applies force to the outer peripheral side of the tube sheet 1, and the middle part of the tube sheet 1 is not affected by the sealing structure, so it is convenient to arrange the inlet header 3, the outlet header 4 and the insulation layer 9.

[0039] In the description of the present invention, it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the above detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the utility model.

[0041] In the description of the present utility model, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A sealing structure for a fluidized bed heater, wherein the fluidized bed (8) is provided with a window (81), and the heater can enter and exit from the window (81), wherein: The invention comprises a tube sheet (1) arranged vertically and having a window (81) capable of sealing a fluidized bed (8), and a heat exchange tube row (2) fixed to the inner side of the tube sheet (1). A plurality of studs (5) are arranged on the outer side of the window (81). The plurality of studs (5) are arranged in a spaced manner around the periphery of the window (81). A fitting portion (82) is left between the studs (5) and the edge of the window (81). The inner peripheral side of the tube sheet (1) is pressed against the fitting portion (82). The studs (5) are sleeved with a locking nut (6) and a pressing plate (7). The locking nut (6) applies force to the pressing plate (7) so that the pressing plate (7) presses against the outer peripheral side of the tube sheet (1).

2. The sealing structure of a fluidized bed heater according to claim 1, characterized in that: The tube sheet (1) and the window (81) are both polygonal in shape, and a plurality of studs (5) are arranged at intervals along each side of the window (81).

3. The sealing structure of a fluidized bed heater according to claim 2, characterized in that: The pressing plate (7) is in the shape of a straight strip, and each side of the tube sheet (1) corresponds to one pressing plate (7), and the locking nuts (6) corresponding to the same row of studs (5) jointly lock the pressing plate (7).

4. The sealing structure of a fluidized bed heater according to claim 2, characterized in that: The pressing plate (7) is polygonal in shape, and one pressing plate (7) presses multiple edges of the tube sheet (1) at the same time, and the locking nuts (6) corresponding to the studs (5) jointly lock one pressing plate (7).

5. The sealing structure of a fluidized bed heater according to claim 1 or 2, characterized in that: A boss (83) is provided on the outer peripheral side of the window (81), a plurality of studs (5) stand on the boss (83), and the side of the boss (83) is matched with the periphery of the tube plate (1) for positioning.

6. The sealing structure of a fluidized bed heater according to claim 1, characterized in that: A sealing groove (12) is provided at a position on the inner circumference of the tube sheet (1) corresponding to the fitting portion (82), and a sealing strip (13) is provided in the sealing groove (12).

7. The sealing structure of a fluidized bed (8) heater according to claim 1, characterized in that: Multiple rows of heat exchange tube rows (2) are arranged in parallel transversely, and each row of heat exchange tube rows (2) comprises multiple branch tubes (21) arranged in parallel, and an upper header (22) and a lower header (23) respectively connecting two ends of the multiple branch tubes (21), each branch tube (21) is arranged in the longitudinal direction, and the upper header (22) and the lower header (23) are arranged in the transverse direction.

8. The sealing structure of a fluidized bed heater according to claim 7, characterized in that: It also includes an inlet header (3) and an outlet header (4) fixed to the outside of the tube sheet (1); the ports of the upper headers (22) of the multiple rows of heat exchange tubes (2) are welded and fixed to the tube holes (11) of the tube sheet (1) and are connected to the inlet header (3); the inlet header (3) is connected to a steam input pipe (31); the ports of the lower headers (23) of the multiple rows of heat exchange tubes (2) are welded and fixed to the tube holes (11) of the tube sheet (1) and are connected to the outlet header (4); the outlet header (4) is connected to a drainage pipe (41).

9. The sealing structure of a fluidized bed heater according to claim 8, characterized in that: An insulation layer (9) is provided on the outer side of the tube sheet (1), the insulation layer (9) wraps the inlet header (3) and the outlet header (4), and a preset distance is left between the peripheral side of the insulation layer (9) and the peripheral side of the tube sheet (1) so that the pressure plate (7) can press against the outer side surface of the tube sheet (1).

10. The sealing structure of a fluidized bed heater according to claim 9, characterized in that: A cover plate (10) is arranged on the outer side of the thermal insulation layer (9), and the cover plate (10) surrounds the thermal insulation layer (9).

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