Compact heater for fluidized bed
By adopting a parallel arrangement of multiple heat exchange pipe rows and pipe plate structures in the fluidized bed dryer, the problem of the built-in heat exchanger is not compact, simplifying the welding process and saving insulation materials, and realizing the compact heater design.
Patent Information
- Application Number
- CN202420250910.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-02-01
AI Technical Summary
The built-in heat exchanger of the existing fluidized bed dryer is not compact, making it difficult for the drum to wrap the insulation layer, and the welding is complicated and difficult.
Multi-row heat exchange pipe rows arranged side by side, including multiple branch pipes arranged side by side, and connected upper and lower current collector pipes. Through vertically arranged pipe plates, inlet containers and outlets fixed to the outside of the pipe plates The box is directly welded to fix the upper and lower current collector pipes and the lower current collector pipes to the pipe plate, simplifying the welding process, and a thermal insulation layer is installed on the outside of the pipe plate to save materials.
The structure of the heater is compact, reducing welding difficulty, and saving material by reducing the thickness of the insulation layer, improving the tightness of the insulation layer and avoiding falling off.
Smart Images
Figure CN222165449U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to a compact heater for a fluidized bed. Background Art
[0002] Fluidized bed heating dryer is a large category of traditional drying equipment, which is widely used in chemical, petroleum, feed and other industries, and is suitable for drying various granular, flaky and other materials and heat-sensitive materials. For example, the Chinese patent document with announcement number CN201497295U 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: 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 several metal vertical branches, which form a vertical tube bundle. On the basis of the general structural form of the fluidized bed dryer, several groups of built-in heat exchangers are added on the fluidizing section of the traditional fluidized bed. The coil of the built-in heat exchanger adopts the vertical tube bundle form. 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 traditional fluidized bed dryers, the operating cost of the system is reduced.
[0003] The applicant has found that the above existing technologies have the following disadvantages: the working medium of each built-in heat exchanger enters or flows out from the lower steam drum and the upper steam drum of the built-in heat exchanger fixed by flange devices outside the fluidized bed, and the horizontal branch pipe is connected to the steam drum only after passing through the fluidized bed, which results in: ① the structure is not compact; ② it is difficult to wrap the steam drum with an insulation layer, or a large amount of insulation material is required to achieve the wrapping; ③ the welding between the horizontal branch pipe and the tubular steam drum is complicated, which increases the difficulty of welding. Summary of the invention
[0004] In view of the above technical problems in the prior art, the utility model provides a compact heater for a fluidized bed.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] Provided is a compact heater for a fluidized bed, comprising a plurality of rows of heat exchange tubes arranged in parallel, each row of heat exchange tubes comprising a plurality of branch tubes arranged in parallel, and an upper header and a lower header respectively connecting the two ends of the plurality of branch tubes, each branch tube being arranged in the longitudinal direction, and the upper header and the lower header being arranged in the transverse direction; wherein:
[0007] It also includes a vertically arranged tube sheet for sealing the fluidized bed window, and an inlet header and an outlet header fixed to the outside of the tube sheet, the inlet header and the outer side of the tube sheet together form a steam input chamber, the ports of the upper collecting pipes of the multiple rows of heat exchange tubes are welded and fixed to the tube holes of the tube sheet and connected to the steam input chamber, and the inlet header is connected to the steam input pipe; the outlet header and the outer side of the tube sheet together form a condensate output chamber, the ports of the lower collecting pipes of the multiple rows of heat exchange tubes are welded and fixed to the tube holes of the tube sheet and connected to the condensate output chamber, and the outlet header is connected to a drain pipe.
[0008] As a further optional solution, the inlet header and the outlet header are both semicircular tubes, which include a 180° arc plate and sealing plates at both ends of the arc plate. The arc plate, sealing plate and tube plate together form the steam input chamber / condensate output chamber.
[0009] As a further optional solution, the inlet header and the outlet header are both welded and fixed to the outer side surface of the tube sheet.
[0010] As a further optional solution, the steam inlet pipe is fixed to the inlet header by welding, and the welds between the steam inlet pipe and the inlet header and the welds between the inlet header and the tube sheet are staggered.
[0011] As a further optional solution, the drain pipe is welded and fixed to the outlet header, the bottom of the outlet header is lower than the lower header in the longitudinal direction, and the drain pipe and the bottom of the outlet header are arranged non-tangentially, so that the welds between the drain pipe and the outlet header and the welds between the outlet header and the tube sheet are staggered.
[0012] As a further option, the inlet header is provided with a pressure relief valve.
[0013] As a further optional solution, the steam inlet pipe and the drain pipe are respectively provided with connecting flanges.
[0014] As a further optional solution, the upper headers and the lower headers of each row of heat exchange tubes are arranged horizontally, and the inlet header and the outlet header are arranged horizontally accordingly.
[0015] As a further optional solution, a thermal insulation layer is provided on the outer side of the tube sheet, and the thermal insulation layer wraps the inlet header and the outlet header.
[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] The utility model is a compact heater for a fluidized bed. When in use, low-temperature steam enters the inlet header from the steam input pipe, and then flows to each upper header, and then flows downward to each branch pipe. The steam cools down and condenses in the branch pipe through the tube wall and the dried material in the fluidized bed. After condensing into water, it converges to the lower header below, and then flows directly to the outlet header and flows out from the drain pipe. Compared with the prior art, the inlet header and the outlet header are directly fixed to the tube sheet, and the structure is compact; the ports of the upper header and the lower header are directly welded and fixed to the tube sheet to connect the corresponding inlet header and outlet header, and the welding between the tube and the plate is easier to achieve, reducing the difficulty of welding. Furthermore, there is zero distance between the inlet header, the outlet header and the tube sheet, and reducing the thickness of the insulation layer on the outside of the tube sheet can also achieve wrapping, saving insulation materials, making the insulation layer and the tube sheet tighter and not easy to fall off. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 Schematic diagram of the structure of a compact heater for a fluidized bed in an embodiment (the insulation layer is not shown).
[0020] Figure 2 It is a partial cross-sectional view of a compact heater for a fluidized bed in an embodiment, mainly illustrating the connection relationship between the inlet and outlet headers and various components.
[0021] Figure 3 Another partial cross-sectional view of a compact fluidized bed heater in the embodiment, mainly illustrating the connection relationship between the outlet header and various components
[0022] Figure 4 It is a partial side view of a compact heater for a fluidized bed in an embodiment, mainly illustrating the insulation layer on the outer side of the tube plate.
[0023] Reference numerals:
[0024] Tube sheet 1, tube hole 11;
[0025] Heat exchange tube row 2, branch tube 21, upper header 22, lower header 23;
[0026] Inlet header 3, pressure relief valve 31, steam input pipe 32, outlet header 4, drain pipe 41, arc plate 341, sealing plate 342;
[0027] Steam input chamber 5, condensate output chamber 6, connecting flange 7, insulation layer 8, cover plate 9. DETAILED DESCRIPTION
[0028] 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.
[0029] The compact heater for a fluidized bed of this embodiment is used in conjunction with a fluidized bed. The fluidized bed has multiple windows, and multiple heaters can be pushed in through the windows to heat and dry the materials flowing through the fluidized bed. Multiple heaters can also be pulled out of the windows for cleaning / maintenance. The specific structure of the heater is as follows Figures 1 to 4 As shown, it includes multiple rows of heat exchange tubes 2 arranged in parallel, each row of heat exchange tubes 2 includes multiple branch tubes 21 arranged in parallel, and upper headers 22 and lower headers 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 headers 22 and the lower headers 23 are arranged in the transverse direction. The heater also includes a vertically arranged tube sheet 1 for sealing the fluidized bed window, and an inlet header 3 and an outlet header 4 fixed to the outside of the tube sheet 1, the inlet header 3 and the outer side of the tube sheet 1 together enclose a steam input cavity 5, 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 connected to the steam input cavity 5, and the inlet header 3 is connected to a steam input pipe 32. The outlet header 4 and the outer side surface of the tube sheet 1 together form a condensate output chamber 6. 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 connected to the condensate output chamber 6. The outlet header 4 is connected to a drain pipe 41.
[0030] When in use, low-temperature steam enters the inlet header 3 from the steam input pipe 32, 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. 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.
[0031] In this embodiment, the inlet header 3 and the outlet header 4 are both semicircular tubes, which include a 180° arc plate 341 (half of a cylinder) and sealing plates 342 located at both ends of the arc plate 341. The arc plate 341, the sealing plate 342 and the tube sheet 1 together form the steam input chamber 5 / condensate output chamber 6.
[0032] In this embodiment, the inlet header 3 and the outlet header 4 are both welded and fixed to the outer side of the tube sheet 1. The steam input pipe 32 is welded and fixed to the inlet header 3, and the welds between the steam input pipe 32 and the inlet header 3 and between the inlet header 3 and the tube sheet 1 are staggered to avoid interference between the welds and affect the connection strength.
[0033] In this embodiment, the drain pipe 41 is welded and fixed to the outlet header 4, and the bottom of the outlet header 4 is lower than the lower header 23 in height to avoid water accumulation in the lower header 23, and the drain pipe 41 and the bottom of the outlet header 4 are arranged non-tangentially, so that the welds between the drain pipe 41 and the outlet header 4 and the welds between the outlet header 4 and the tube sheet 1 are staggered to avoid interference between the welds and affect the connection strength.
[0034] Compared with the prior art, the inlet header 3 and the outlet header 4 are directly fixed to the tube sheet 1, and the structure is compact; the ports of the upper header 22 and the lower header 23 are directly welded and fixed to the tube sheet 1 to connect the corresponding inlet header 3 and the outlet header 4, and the welding between the tubes and the plates is easier to achieve, reducing the difficulty of welding.
[0035] In this embodiment, the inlet header 3 is provided with a pressure relief valve 31, which opens to relieve pressure when the steam pressure is too high.
[0036] In this embodiment, the steam input pipe 32 and the drain pipe 41 are respectively provided with connecting flanges 7 for easy connection.
[0037] In this embodiment, the upper headers 22 and the lower headers 23 of each row of heat exchange tube rows 2 are arranged horizontally, and the inlet headers 3 and the outlet headers 4 are arranged horizontally correspondingly, so that the layout is more reasonable and compact.
[0038] In this embodiment, an insulation layer 8 is provided on the outside of the tube sheet 1, and the insulation layer 8 wraps the inlet header 3 and the outlet header 4. There is no distance between the inlet header 3, the outlet header 4 and the tube sheet 1, and the insulation layer 8 on the outside of the tube sheet 1 can also be wrapped by reducing the thickness of the insulation layer 8, saving insulation materials, making the insulation layer 8 and the tube sheet 1 tighter and not easy to fall off. A cover plate 9 is provided on the outside of the insulation layer 8, and the cover plate 9 surrounds the insulation layer 8 to prevent the insulation layer 8 from falling off and maintain the compactness of the insulation layer 8.
[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 compact heater for a fluidized bed, comprising a plurality of rows of heat exchange tubes (2) arranged in parallel, each row of heat exchange tubes (2) comprising a plurality of branch tubes (21) arranged in parallel, and an upper header (22) and a lower header (23) respectively connecting the two ends of the plurality of branch tubes (21), the branch tubes (21) being arranged in the longitudinal direction, and the upper header (22) and the lower header (23) being arranged in the transverse direction; wherein: It also includes a tube sheet (1) arranged vertically for sealing the fluidized bed window, and an inlet header (3) and an outlet header (4) fixed to the outside of the tube sheet (1); the inlet header (3) and the outer side surface of the tube sheet (1) together form a steam input chamber (5); 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 steam input chamber (5); the inlet header (3) is connected to a steam input pipe (32); the outlet header (4) and the outer side surface of the tube sheet (1) together form a condensate output chamber (6); 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 condensate output chamber (6); and the outlet header (4) is connected to a drainage pipe (41).
2. A compact heater for a fluidized bed according to claim 1, characterized in that: The inlet header (3) and the outlet header (4) are both semicircular tubes, and the semicircular tubes include a 180° arc plate (341) and sealing plates (342) located at both ends of the arc plate (341). The arc plate (341), the sealing plate (342) and the tube sheet (1) together form the steam input chamber (5) / condensate output chamber (6).
3. A compact heater for a fluidized bed according to claim 1, characterized in that: The inlet header (3) and the outlet header (4) are both welded and fixed to the outer side surface of the tube sheet (1).
4. A compact heater for a fluidized bed according to claim 3, characterized in that: The steam input pipe (32) is welded and fixed to the inlet header (3), and the weld between the steam input pipe (32) and the inlet header (3) and the weld between the inlet header (3) and the tube sheet (1) are arranged in a staggered manner.
5. The compact heater for a fluidized bed according to claim 1, characterized in that: The drain pipe (41) is welded and fixed to the outlet header (4), the bottom of the outlet header (4) is lower than the lower header (23) in the longitudinal direction, and the drain pipe (41) and the bottom of the outlet header (4) are arranged non-tangentially, so that the weld between the drain pipe (41) and the outlet header (4) and the weld between the outlet header (4) and the tube sheet (1) are arranged staggered.
6. A compact heater for a fluidized bed according to claim 1, characterized in that: The inlet header (3) is provided with a pressure relief valve (31).
7. The compact heater for a fluidized bed according to claim 1, characterized in that: The steam input pipe (32) and the drain pipe (41) are respectively provided with connecting flanges (7).
8. The compact heater for a fluidized bed according to claim 1, characterized in that: The upper headers (22) and lower headers (23) of each row of heat exchange tubes (2) are arranged horizontally, and the inlet headers (3) and outlet headers (4) are arranged horizontally accordingly.
9. The compact heater for a fluidized bed according to claim 1, characterized in that: A heat-insulating layer (8) is provided on the outer side of the tube sheet (1), and the heat-insulating layer (8) wraps the inlet header (3) and the outlet header (4).
10. A compact heater for a fluidized bed according to claim 9, characterized in that: A cover plate (9) is arranged on the outer side of the thermal insulation layer (8), and the cover plate (9) surrounds the thermal insulation layer (8).