CN210084939U - Furnace tube fixing structure applied to reformer of hydrocarbon-steam reforming hydrogen production device - Google Patents
Furnace tube fixing structure applied to reformer of hydrocarbon-steam reforming hydrogen production device Download PDFInfo
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- CN210084939U CN210084939U CN201920740012.6U CN201920740012U CN210084939U CN 210084939 U CN210084939 U CN 210084939U CN 201920740012 U CN201920740012 U CN 201920740012U CN 210084939 U CN210084939 U CN 210084939U
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Abstract
A furnace tube fixing structure applied to a reforming furnace of a hydrocarbon-steam reforming hydrogen production device is used for sealing connection between a plurality of rows of arranged furnace tubes and a reforming furnace body, the plurality of furnace tubes vertically penetrate through and extend out of a furnace top plate and a furnace bottom plate of the reforming furnace body, one end of each furnace tube extending out of the furnace bottom plate downwards is in a fixed state relative to a furnace bottom steel structure, and the influence of displacement of the furnace tubes and a lower gas collecting tube due to thermal expansion on the sealing structure between the furnace tubes and the furnace bottom plate is avoided. The utility model discloses a boiler tube and stove bottom fixed knot construct and are connected, the boiler tube is connected with lower discharge through lower pigtail, has avoided the lateral displacement that the discharge thermal energy extends the boiler tube production down, can guarantee boiler tube and roof, bottom plate seal structure's axiality furthest, guarantees sealed effect, and then reduces the surplus air coefficient in the interior flue gas of stove, has improved the thermal efficiency of reborner, avoids the welding seam fracture because of the thermal energy leads to simultaneously, has guaranteed the security of production.
Description
Technical Field
The utility model relates to the technical field of petrochemical industry, in particular to a furnace tube fixing structure applied to a reformer of a hydrocarbon-steam reforming hydrogen production device.
Background
The hydrogen prepared by hydrocarbon-steam conversion method is the main source of hydrogen needed by hydrogenation device in petroleum refining process, and the reformer is the core equipment of the hydrogen preparation device. The reforming furnace is internally provided with rows of furnace tubes penetrating through a furnace top plate and a furnace bottom plate, fuel in the reforming furnace is combusted to heat the furnace tubes, hydrocarbon-steam in the furnace tubes is cracked into hydrogen under the action of high temperature and in-tube catalyst, and the hydrogen enters a lower gas collecting tube from the lower end of the furnace tubes through a lower pigtail tube and is then sent out.
At present, the most extensive and common furnace tube fixing and mounting modes are adopted: the first is a fixing mode of directly welding the lower end of the furnace tube and the lower gas collecting tube together; the second is to arrange a spring support at the top of the furnace tube to support the furnace tube, or to hang the furnace tube by a constant force spring, or to hang the furnace tube by a pulley and a heavy hammer, so that the furnace tube is in a hanging state in a cold state, and the lower end of each furnace tube is connected with a lower gas collecting tube by a corresponding lower pigtail tube.
When the reformer is ignited, the temperature of the furnace tube and the lower gas collecting tube is continuously raised to be over 800 ℃, the furnace tube adopting the first fixing mode cannot expand and extend downwards after being heated, and can only release thermal expansion extension quantity upwards in one direction under the traction of the hanging mechanism at the top of the furnace tube, at the moment, the lower gas collecting pipe generates thermal expansion extension in the horizontal direction after being heated, and can push the furnace pipe welded together with the lower gas collecting pipe to move transversely, because the lower gas collecting pipe is very long, the thermal expansion extension amount after being heated is accumulated, the lateral movement generated by the furnace pipe at the outermost end in the thermal expansion extension direction is the largest, the coaxiality of the sealing structure between the furnace pipe and the furnace body is damaged by the lateral movement of the furnace pipe, a gap is generated between the furnace pipe and the furnace body, thus, the external air enters the reformer body to influence the coefficient of the excess air in the reformer, and the heat dissipation loss is increased at the position, so that the thermal efficiency of the reformer is reduced. After the furnace tube adopting the second fixing mode is heated, the furnace tube firstly expands downwards by 40-60mm to release thermal expansion extension, and then expands upwards under the traction of the hanging mechanism at the top of the furnace tube after reaching the expansion bottom dead center to release the residual thermal expansion extension. At this time, the lower gas collecting tube generates thermal expansion extension amount in the horizontal direction to the communicating tube after being heated, and the communicating tube and the furnace tube welded together with the communicating tube are pushed to move transversely.
Obviously, the two fixed mounting modes of the furnace tube have adverse effects on the sealing structure of the furnace tube and the furnace bottom plate. When the cold and hot state changes, the furnace tubes are transversely displaced, so that the coaxial sealing structure is damaged, and the heat efficiency of the converter is influenced.
SUMMERY OF THE UTILITY MODEL
The problem that the fixed mounting mode exists to current hydrogen manufacturing reformer boiler tube, the utility model provides a be applied to boiler tube fixed knot of hydrocarbon-steam reforming hydrogen plant reformer constructs, the purpose is restraint boiler tube and receives the horizontal displacement trend that the collector thermal energy extends down at bottom plate seal structure position, so that can implement effective reliable sealed to this position, and then reduce the air admission, reduce the surplus air coefficient in the interior flue gas of stove, with the thermal efficiency that improves the reformer, simultaneously through predetermineeing thermal expansion compensation measure, avoid because of the welding seam fracture that the thermal energy leads to.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a furnace tube fixing structure applied to a reforming furnace of a hydrocarbon-steam reforming hydrogen production device is used for sealing connection between a plurality of rows of arranged furnace tubes and a reforming furnace body, the plurality of furnace tubes vertically penetrate through and extend out of a furnace top plate and a furnace bottom plate of the reforming furnace body, furnace tubes extending out of the furnace bottom plate downwards are provided with fixing support lugs used for preventing the furnace tubes from expanding due to heating and extending downwards and transversely swinging and displacing, and the fixing support lugs are fixedly connected with a furnace bottom steel structure.
Preferably, a pair of auxiliary hanging lugs are symmetrically welded on the outer pipe wall of the furnace pipe extending upwards out of the furnace roof, and the auxiliary hanging lugs are connected with a counterweight hanger capable of balancing weight through a steel wire rope and a fixed pulley.
Preferably, the pipe wall of the furnace pipe extending downwards out of the furnace bottom plate is connected with a lower pigtail pipe, and the other end of the lower pigtail pipe is connected with a lower gas collecting pipe which is horizontally placed; the lower pigtail tube is an S-shaped tube which can be elastically deformed.
Preferably, the connection of the lower pigtail tube with the furnace tube and the lower gas collecting tube is welding, and after welding, a twist angle for counteracting the transverse thrust generated by the extension of the lower gas collecting tube due to thermal expansion is preset on the lower pigtail tube along the opposite direction of the extension of the lower gas collecting tube due to thermal expansion.
Preferably, the fixed support lug is a shaft part, or a pipe part, or a sheet metal part.
Preferably, the furnace bottom steel structure is provided with channel steel for supporting the fixed lugs, and the channel steel is horizontally arranged on two sides of a plurality of rows of arranged furnace tubes and fixedly connected with the fixed lugs.
Preferably, the fixed lugs are symmetrically welded on two sides of the outer wall of the furnace tube, and the fixed lugs are placed on the channel steel and fixedly connected with the channel steel.
Owing to adopt above-mentioned technical scheme, compare the background art, the utility model discloses following beneficial effect has:
the beneficial effects are that: the furnace tube and the furnace bottom steel structure form rigid fixed connection, so that the axial thermal expansion extension of the furnace tube in the furnace bottom plate sealing structure is greatly reduced, and the sealing of the furnace body of the reforming furnace is facilitated;
the beneficial effects are that: the furnace tube is rigidly and fixedly connected with a furnace bottom steel structure, and is connected with the lower gas collecting tube through the lower pigtail tube, so that the transverse displacement of the furnace tube caused by the thermal expansion and extension of the lower gas collecting tube is avoided, the coaxiality of a sealing structure of the furnace tube and a furnace bottom plate can be ensured to the maximum extent, the excess air coefficient in the smoke in the furnace is further reduced, the heat dissipation loss is reduced, and the heat efficiency of the reformer is improved;
the beneficial effects are three: the furnace tube is connected with the lower gas collecting tube through the lower pigtail tube, the good elastic deformation of the lower pigtail tube is utilized, and the welding line cracking caused by thermal expansion is avoided by presetting thermal expansion compensation measures, so that the production safety is ensured.
Drawings
FIG. 1 is a schematic view of a fixing structure of a furnace tube;
FIG. 2 is a schematic view of a fixed structure of rows of furnace tubes;
fig. 3 is a schematic structural view of embodiment 2.
In the figure: 1. a furnace tube; 1.1, fixing the support lug; 1.2, auxiliary suspension lifting lugs; 1.3, flange end cover; 2. a reformer body; 3. a furnace bottom steel structure; 3.1, channel steel; 4. feeding a pigtail tube; 5. a lower gas collecting pipe.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that in the description of the present invention, the terms "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "lateral", "axial", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as non-detachable integral connections, detachable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1:
a furnace tube fixing structure applied to a reformer of a hydrocarbon-steam reforming hydrogen production device is used for sealing connection between a plurality of rows of arranged furnace tubes 1 and a reformer furnace body 2, the reformer comprises the reformer furnace body 2 and a plurality of rows of arranged furnace tubes 1 and the like, the plurality of rows of arranged furnace tubes 1 vertically penetrate through and extend out of a furnace top plate and a furnace bottom plate of the reformer furnace body 2, one ends of the furnace tubes 1 downwards extend out of the furnace bottom plate and are in a fixed state relative to a furnace bottom steel structure 3, and the influence of displacement of the furnace tubes 1 and a lower gas collecting tube 4 caused by thermal expansion is avoided. As shown in fig. 1 and 2, in the present embodiment, a furnace tube 1 extending downward from a furnace bottom plate is provided with a fixed lug 1.1 for preventing the furnace tube from expanding due to heat and moving downward and laterally, and the fixed lug 1.1 is fixedly connected with a furnace bottom steel structure 3.
The lower end face of the furnace tube 1 is usually provided with a flange end cover 1.3 for observation and maintenance, and a fixed lug 1.1 is welded between the lower flange end cover 1.3 of the furnace tube and a lower pigtail tube 4 for convenient observation and maintenance. In this embodiment, the fixing lugs 1.1 are cylindrical shaft members or tube members, and are symmetrically welded to both sides of the outer wall of the furnace tube 1 and between the flange end caps 1.3 and the lower pigtail tube 4, so as to leave a space for the subsequent welding connection between the lower pigtail tube 4 and the furnace tube 1.
Because the furnace tubes 1 in the reformer body are arranged in multiple rows and are numerous, in order to facilitate construction, the steel structure 3 at the bottom of the furnace is provided with channel steel 3.1 for supporting the fixed lugs 1.1, and the channel steel 3.1 is horizontally arranged at two sides of the multiple furnace tubes 1 arranged in multiple rows. Like this, the fixed journal stirrup 1.1 of every boiler tube can all place neatly on channel-section steel 3.1, because fixed journal stirrup 1.1 is cylindric axle class spare, preferentially uses U type bolt and channel-section steel 3.1 spiro union, in order to guarantee that every boiler tube 1 is coaxial with the seal structure on roof of the stove, the bottom plate of the stove, is equipped with rectangular shape connecting hole on the channel-section steel 3.1 with U type bolted connection, the coaxial adjustment of being convenient for.
Because the furnace tube 1 is longer and heavier, most of the length is above the furnace bottom plate, in order to keep the stress balance of the furnace tube 1 and reduce the influence of the overturning force on the structure of the sealing structure, a pair of auxiliary hanging lugs 1.2 are symmetrically welded on the outer pipe wall of the furnace tube 1 which upwards extends out of the furnace top plate, and the auxiliary hanging lugs 1.2 are connected with a counterweight hanger capable of balancing weight through a steel wire rope and a fixed pulley. Because the heavy hammer is flexibly connected with the furnace tube 1 through the steel wire rope, the stress of the furnace tube can be balanced, and the balance is not influenced by the thermal expansion and extension of the furnace tube.
So far, the end of the furnace tube 1, which extends out of the furnace bottom plate downwards, is in a fixed state relative to the furnace bottom steel structure 3, and the furnace tube 1 can only expand and extend in a single direction, so that the influence on the sealing structure between the furnace tube 1 and the furnace bottom plate due to displacement caused by thermal expansion is avoided.
In order to ensure that the furnace tube 1 is not influenced by the transverse thrust effect caused by the thermal expansion and extension of the lower gas collecting tube 5, the furnace tube 1 and the horizontally arranged lower gas collecting tube 5 are connected by a lower pigtail tube 4 with the function of all-directional deformation compensation. The lower pigtail 4 is S-shaped and has a certain elastic deformation capability.
In order to ensure the reliability of connection, the connection of the lower pigtail tube 4 with the furnace tube 1 and the lower gas collecting tube 5 is welding. In order to ensure that the welding seam does not crack due to thermal expansion stress under the high-temperature working condition, when the lower pigtail tube 4 is welded with the furnace tube 1 and the lower gas collecting tube 5, a certain twist angle is preset in the lower pigtail tube 4 along the opposite direction of the thermal expansion extension of the lower gas collecting tube 5 so as to offset the transverse thrust of the thermal expansion extension of the lower gas collecting tube 5 on the lower pigtail tube 4.
Therefore, the utility model discloses a boiler tube 1 is connected with stove bottom steel construction 3, and boiler tube 1 is connected with lower discharge 5 through lower pigtail 4, has avoided 5 thermal expansions of discharge to extend the lateral displacement to boiler tube 1 production down, can guarantee boiler tube and roof, bottom plate seal structure's axiality to furthest, and then reduces the surplus air coefficient in the interior flue gas of stove, reduces heat dissipation loss, has improved the thermal efficiency of reborner. By utilizing the good elastic deformation of the lower pigtail 4 and the preset thermal expansion compensation measure, the cracking of the welding line caused by thermal expansion is avoided, and the production safety is ensured.
Example 2:
the furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device in the embodiment 1 is different from the embodiment 1 in that, as shown in fig. 3, the fixing lugs 1.1 are sheet metal parts and are symmetrically welded on two sides of the outer wall of the furnace tube 1, the fixing lug 1.1 of each furnace tube can be neatly placed on the channel steel 3.1, and the fixing lug 1.1 is a sheet metal part and can be screwed with the channel steel 3.1 through a bolt.
Obviously, the connecting mode of the sheet metal parts achieves the using effect described in the embodiment 1. The ways in which the same fixing effect can be achieved are various and will not be described again here.
The part of the utility model not detailed is prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a be applied to hydrocarbon-steam reforming hydrogen plant reborner's boiler tube fixed knot constructs for sealing connection between the many boiler tubes (1) of multirow range and reborner furnace body (2), the furnace roof and the bottom plate of many boiler tubes (1) vertical run-through and stretching out reborner furnace body (2), its characterized in that: the furnace tube (1) extending out of the furnace bottom plate downwards is provided with a fixed support lug (1.1) for preventing the furnace tube from expanding due to heating and extending downwards and from swinging and displacing transversely, and the fixed support lug (1.1) is fixedly connected with a furnace bottom steel structure (3).
2. The furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device, as set forth in claim 1, is characterized in that: a pair of auxiliary hanging lugs (1.2) are symmetrically welded on the outer pipe wall of the furnace pipe (1) extending upwards out of the furnace roof, and the auxiliary hanging lugs (1.2) are connected with a counterweight hanger capable of balancing weight through a steel wire rope and a fixed pulley.
3. The furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device according to claim 1 or 2, characterized in that: a lower pigtail pipe (4) is connected to the pipe wall of the furnace pipe (1) extending out of the furnace bottom plate, and the other end of the lower pigtail pipe (4) is connected with a lower gas collecting pipe (5) which is horizontally arranged; the lower pigtail tube (4) is an S-shaped tube which can be elastically deformed.
4. The furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device, as set forth in claim 3, is characterized in that: the lower pigtail tube (4) is welded with the furnace tube (1) and the lower gas collecting tube (5), and after welding, a twist angle used for counteracting the transverse thrust generated by the extension of the lower gas collecting tube (5) due to the thermal expansion of the lower gas collecting tube (5) to the lower pigtail tube (4) is preset in the lower pigtail tube (4) along the opposite direction of the extension of the thermal expansion of the lower gas collecting tube (5).
5. The furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device, as set forth in claim 1, is characterized in that: the fixed support lug (1.1) is an axial part, or a pipe part, or a sheet metal part.
6. The furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device, as set forth in claim 1, is characterized in that: the furnace bottom steel structure (3) is provided with channel steel (3.1) for supporting the fixed lugs (1.1), and the channel steel (3.1) is horizontally arranged on two sides of the multiple rows of arranged furnace tubes (1) and is fixedly connected with the fixed lugs (1.1).
7. The furnace tube fixing structure applied to the reformer of the hydrocarbon-steam reforming hydrogen production device, as set forth in claim 6, is characterized in that: the fixed support lugs (1.1) are symmetrically welded on two sides of the outer wall of the furnace tube (1), and the fixed support lugs (1.1) are placed on the channel steel (3.1) and are fixedly connected with the channel steel (3.1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920740012.6U CN210084939U (en) | 2019-05-22 | 2019-05-22 | Furnace tube fixing structure applied to reformer of hydrocarbon-steam reforming hydrogen production device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920740012.6U CN210084939U (en) | 2019-05-22 | 2019-05-22 | Furnace tube fixing structure applied to reformer of hydrocarbon-steam reforming hydrogen production device |
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| CN210084939U true CN210084939U (en) | 2020-02-18 |
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| CN201920740012.6U Active CN210084939U (en) | 2019-05-22 | 2019-05-22 | Furnace tube fixing structure applied to reformer of hydrocarbon-steam reforming hydrogen production device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002401A (en) * | 2019-05-22 | 2019-07-12 | 山东齐鲁石化工程有限公司 | Applied to hydro carbons-producing hydrogen from steam conversion reburner boiler tube installing and fixing method |
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2019
- 2019-05-22 CN CN201920740012.6U patent/CN210084939U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002401A (en) * | 2019-05-22 | 2019-07-12 | 山东齐鲁石化工程有限公司 | Applied to hydro carbons-producing hydrogen from steam conversion reburner boiler tube installing and fixing method |
| CN110002401B (en) * | 2019-05-22 | 2024-03-15 | 山东齐鲁石化工程有限公司 | Furnace tube installation and fixation method applied to hydrocarbon-steam conversion hydrogen production reformer |
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