CN211625198U - Tube plate heat protection structure for fluidized bed gasification waste heat boiler - Google Patents
Tube plate heat protection structure for fluidized bed gasification waste heat boiler Download PDFInfo
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- CN211625198U CN211625198U CN201922496367.8U CN201922496367U CN211625198U CN 211625198 U CN211625198 U CN 211625198U CN 201922496367 U CN201922496367 U CN 201922496367U CN 211625198 U CN211625198 U CN 211625198U
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Abstract
A tube plate heat protection structure for a fluidized bed gasification waste heat boiler comprises a tube plate arranged in a shell of the waste heat boiler, wherein the tube plate is transversely fixed in the shell, and the tube plate is connected with the shell through a transition section; the heat exchange tube is internally sleeved with a metal sleeve, and the upper end of the metal sleeve protrudes out of the upper end of the heat exchange tube; the outer wall of the metal sleeve is radially and outwards provided with a boss used for bearing the tube plate, and an inner opening at the upper end of the metal sleeve is arranged in a flaring manner; the upper end opening of the metal sleeve is communicated with the high-temperature air inlet, the high-temperature air inlet is formed by a cavity formed by pouring a pouring material in the shell of the waste heat boiler, and the pouring material wraps the metal sleeve and protrudes out of the heat exchange pipe part. The high-temperature-resistant heat exchange tube has the advantages of high strength and creep strength at high temperature, capability of working at the temperature of about 1000 ℃ for a long time and capability of preventing the local overtemperature of the heat exchange tube.
Description
Technical Field
The utility model belongs to the technical field of industrial boiler device, mainly relate to hot protective structure of tube sheet for fluidized bed gasification waste heat boiler.
Background
Under the large background that the modern society emphasizes 'cyclic utilization and resource saving', the functions of the waste heat boiler in the aspects of recovering heat energy, improving economic benefits and the like are more important. The flue gas temperature of the fire tube type waste heat boiler is as high as 900-1000 ℃, the temperature of cooling water and steam outside the heat exchange tube is only about 200 ℃, and the tube plate at the flue gas inlet end has great temperature difference, so that stress concentration at the tube plate and the joint of the heat exchange tube is inevitably caused, and the tube joint is cracked; the flue gas of the waste heat boiler generally contains media such as H2, H2S, NH3 and a small amount of pulverized coal, a heat exchange tube at the flue gas inlet end is in a high-temperature environment of over 900 ℃ for a long time, in order to save cost in actual production, a tube plate and a heat exchange tube are made of low alloy steel materials, and the phenomena of high-temperature corrosion, pulverized coal erosion and the like of a tube joint are easily caused at the moment, so that the heat exchange tube is damaged, and the service life of the whole waste heat boiler is directly influenced by the thermal protection quality of the tube plate at the.
In modern industry, for high-temperature gas above 900 ℃, a refractory material is generally poured on the side of a high-temperature tube plate, and a corundum ceramic sleeve is adopted as a protective sleeve, but because the refractory material, the tube plate and the corundum sleeve have different thermal expansion coefficients, the refractory material, the tube plate and the corundum sleeve are inevitably extruded mutually when the temperature changes, and the ceramic sleeve is easily cracked; the temperature difference between the temperature of the ceramic sleeve positioned on the refractory material section and the temperature difference between the temperature of the ceramic sleeve inserted into the heat exchange tube section is larger, thermal shock cracking is easily caused due to insufficient thermal shock performance of corundum ceramics, the number of times of parking and maintenance of the waste heat boiler is increased, and economic benefit is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to the above-mentioned not enough of prior art, provide one kind and have high intensity and creep strength under high temperature, can work for a long time under the temperature about 1000 ℃, can prevent the heat exchange tube local overtemperature's hot protective structure of tube sheet for fluidized bed gasification exhaust heat boiler.
For solving the above problem, the utility model discloses a technical scheme be: a tube plate heat protection structure for a fluidized bed gasification waste heat boiler comprises a flexible tube plate arranged in a shell of the waste heat boiler, wherein the flexible tube plate is transversely fixed in the shell, and the flexible tube plate is connected with the shell through a transition section; the heat exchange tube is internally sleeved with a metal sleeve, and the upper end of the metal sleeve protrudes out of the upper end of the heat exchange tube; the outer wall of the metal sleeve is radially and outwards provided with a boss used for bearing the tube plate, and an inner opening at the upper end of the metal sleeve is arranged in a flaring manner; the upper end opening of the metal sleeve is communicated with the high-temperature air inlet, the high-temperature air inlet is formed by a cavity formed by pouring a pouring material in the shell of the waste heat boiler, and the pouring material wraps the metal sleeve and protrudes out of the heat exchange pipe part.
By adopting the structure, the metal sleeve is used as a high-temperature resistant material to be sleeved on the inner wall of the heat exchange tube, so that the high-temperature-resistant heat exchange tube can not only avoid being extruded and damaged and thermal shock and fragmentation, but also resist the high temperature at the smoke inlet end; the inner opening at the upper end of the metal sleeve adopts a flaring structure, and the upper surface of the flaring is flush with the surface of the pouring material when the pouring material is poured in the shell, so that the metal sleeve can be well embedded in the pouring material, and the stability and the strength of the metal sleeve are improved.
Preferably, the metal sleeve is made of S31008 material, and the metal sleeve made of the material can avoid extrusion damage and thermal shock fragmentation and can resist high temperature at the smoke inlet end
Preferably, an annular gasket is arranged between the boss of the metal sleeve and the tube plate, and the annular gasket is made of ceramic fibers; the gasket can reduce the extrusion to the metal sleeve caused by the deformation coordination of the tube plate, the casting material and the metal sleeve, and can further slow down the heat transfer of the metal sleeve on the tube plate and play a positive role in controlling the high temperature at the tube plate.
Preferably, an annular groove is formed in the outer surface of the part, extending into the heat exchange tube, of the metal sleeve, ceramic fibers are wound in the groove, and the ceramic fibers protrude out of the outer surface of the metal sleeve; due to the arrangement of the structure, the grooves can increase the friction force between the ceramic fiber paper and the metal sleeve, and the ceramic fiber paper is prevented from naturally falling off under the vibration of high air speed, and once the ceramic fiber paper falls off, the local over-temperature of the heat exchange tube can be caused, so that the heat exchange tube is damaged; and a certain thickness is protruded on the outer surface of the metal sleeve, so that the over-quick heat transfer between the metal sleeve and the heat exchange tube can be prevented.
Preferably, the stainless steel wire is wound on the outer side of the ceramic fiber paper; this setting can further prevent that ceramic fiber paper from droing naturally under the vibrations of high air speed to avoid the heat exchange tube local overtemperature, cause the heat exchange tube to damage.
Preferably, a gap is formed between the metal sleeve and the heat exchange tube, and the width of the gap is 2.5-3 mm; the structure can prevent the heat transmission between the metal sleeve and the heat exchange tube from being too fast.
Preferably, the casting material in the waste heat boiler shell and the casting material at the pipe plate are provided with expansion joints to avoid expansion and contraction of the casting material caused by temperature difference, so that cracks are formed.
Drawings
FIG. 1 is a schematic structural diagram of a tube plate heat protection structure for a fluidized bed gasification waste heat boiler according to the present application.
Figure 2 schematic view of the metal sleeve structure of the present application (without ceramic fibers and stainless steel wires).
Fig. 3 is a schematic view of the structure of a metal sleeve wrapped with ceramic fibers according to the present application.
Fig. 4 is a schematic structural view of a metal sleeve wound with a stainless steel wire.
As shown in the figure: 1-waste heat boiler shell, 2-tube plate, 3-transition section, 4-casting material, 5-metal sleeve, 5.1-boss, 5.2-annular groove, 6-annular gasket, 7-heat exchange tube, 8-ceramic fiber and 9-stainless steel wire.
Detailed Description
The present application will be described in further detail below by way of examples with reference to the accompanying drawings, but the present application is not limited to the following examples.
The materials referred to in this application are not specifically stated, but are all conventional products in the market industry, for example, the ceramic fibers are commercially available high-temperature resistant ceramic fibers.
As shown in fig. 1, the tube plate heat protection structure for the fluidized bed gasification waste heat boiler of the present invention comprises a tube plate 2 arranged in a waste heat boiler shell 1, the tube plate is transversely fixed in the shell, and the tube plate is connected with the shell through a transition section 3; the tube plate is provided with a plurality of tube holes, heat exchange tubes 7 penetrate through the tube holes, metal sleeves 5 are sleeved in the heat exchange tubes, and the upper ends of the metal sleeves protrude out of the upper ends of the heat exchange tubes; a boss 5.1 used for bearing the tube plate is arranged on the outer wall of the metal sleeve radially outwards, and an inner opening at the upper end of the metal sleeve is arranged in a flaring manner; the upper end opening of the metal sleeve is communicated with the high-temperature air inlet, the high-temperature air inlet is formed by a cavity formed by pouring a pouring material 4 in the shell of the waste heat boiler, and the pouring material wraps the position of the metal sleeve protruding out of the heat exchange pipe part.
The metal sleeve 5 can be made of S31008 materials, so that the metal sleeve can be prevented from being damaged by extrusion and broken by thermal shock, and can also resist the high temperature of the smoke inlet end. The top opening of the metal sleeve 5 adopts a flaring structure (the upper port is internally provided with a gradually outward flaring from bottom to top), and the upper surface of the flaring is ensured to be flush with the surface of the castable material when the refractory material is poured, so that the metal sleeve can be well embedded in the castable material, and the firmness and the temperature difference resistance impact of the metal sleeve are increased.
The structure as shown in fig. 1, the boss structure arranged on the metal sleeve 5, the outer diameter of the boss structure is slightly larger than the outer diameter of the heat exchange tube, so as to ensure that the metal sleeve can be clamped on the upper end surface of the tube plate when being installed, and play a role in further fixing the metal sleeve, and the heat exchange tube 7 is required to be full, flat and smooth in welding meat with the tube head of the tube plate 2.
As shown in fig. 1, an annular gasket 6 is arranged between the boss on the metal sleeve 5 and the tube plate, that is, the annular gasket 6 is located between the lower surface of the boss and the upper surface of the tube plate, and is made of ceramic fiber, the gasket 6 can reduce the extrusion on the metal sleeve 5 caused by the deformation coordination of the tube plate 2, the castable 4 and the metal sleeve 5, and on the other hand, the gasket can further slow down the heat transfer of the metal sleeve on the tube plate, and has a positive effect on controlling the high temperature at the tube plate. The boss structure of the application can adopt a local boss structure shown in the attached figure 2, and can also adopt an annular boss structure surrounding the metal sleeve for one circle.
As shown in fig. 2-3, the lower end of the metal sleeve 5 extends into the heat exchange tube 7, the outer surface of the metal sleeve is provided with an annular groove 5.2, ceramic fibers 8 are wound outside the groove, and the ceramic fibers protrude out of the outer surface of the metal sleeve; the grooves can increase the friction force between the ceramic fiber paper and the metal sleeve 5, and the ceramic fiber paper is prevented from naturally falling off under the vibration of high air speed. Once the ceramic fiber paper falls off, the local overtemperature of the heat exchange tube can be caused, and the heat exchange tube is damaged. To further prevent this, a stainless steel wire 9 may be wound around the outer portion of the ceramic fiber paper after the ceramic fiber paper is wound, as shown in fig. 4.
In order to prevent the heat transfer between the metal sleeve 5 and the heat exchange tube 7 from being too fast, in addition to the winding of the ceramic fiber, the gap between the metal sleeve 5 and the heat exchange tube 7 should be strictly controlled in the production and manufacturing process of the equipment, and the gap is controlled to be 2.5-3 mm. The gap is filled with ceramic fibers, i.e. the above-mentioned ceramic fibers protruding from the outer surface of the metal sleeve.
Additionally, the utility model discloses the expansion joint should be left with pipe sheet department pouring material to well casing internal pouring material to avoid the difference in temperature to arouse the breathing of pouring material, thereby form the crackle.
Claims (7)
1. The utility model provides a hot protective structure of tube sheet for fluidized bed gasification waste heat boiler which characterized in that: the structure comprises a tube plate arranged in a shell of the waste heat boiler, wherein the tube plate is transversely fixed in the shell, and the tube plate is connected with the shell through a transition section; the heat exchange tube is internally sleeved with a metal sleeve, and the upper end of the metal sleeve protrudes out of the upper end of the heat exchange tube; the outer wall of the metal sleeve is radially and outwards provided with a boss used for bearing the tube plate, and an inner opening at the upper end of the metal sleeve is arranged in a flaring manner; the upper end opening of the metal sleeve is communicated with the high-temperature air inlet, the high-temperature air inlet is formed by a cavity formed by pouring a pouring material in the shell of the waste heat boiler, and the pouring material wraps the metal sleeve and protrudes out of the heat exchange pipe part.
2. The tube plate heat protection structure for the fluidized bed gasification waste heat boiler according to claim 1, characterized in that: the metal sleeve is made of S31008.
3. The tube plate heat protection structure for the fluidized bed gasification waste heat boiler according to claim 1, characterized in that: an annular gasket is arranged between the boss of the metal sleeve and the tube plate, and the annular gasket is made of high-temperature-resistant ceramic fibers.
4. The tube plate heat protection structure for the fluidized bed gasification waste heat boiler according to claim 1, characterized in that: the outer surface of the part of the metal sleeve extending into the heat exchange tube is provided with an annular groove, and the groove is internally wound with high-temperature resistant ceramic fibers which protrude out of the outer surface of the metal sleeve.
5. The tube plate heat protection structure for the fluidized bed gasification waste heat boiler as set forth in claim 4, wherein: and stainless steel wires are wound on the outer sides of the ceramic fibers.
6. The tube plate heat protection structure for the fluidized bed gasification waste heat boiler according to claim 1, characterized in that: a gap is formed between the metal sleeve and the heat exchange tube, and the width of the gap is 2.5-3 mm.
7. The tube plate heat protection structure for the fluidized bed gasification waste heat boiler according to claim 1, characterized in that: and expansion joints are arranged between the casting material in the waste heat boiler shell and the casting material at the pipe plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922496367.8U CN211625198U (en) | 2019-12-31 | 2019-12-31 | Tube plate heat protection structure for fluidized bed gasification waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922496367.8U CN211625198U (en) | 2019-12-31 | 2019-12-31 | Tube plate heat protection structure for fluidized bed gasification waste heat boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211625198U true CN211625198U (en) | 2020-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922496367.8U Active CN211625198U (en) | 2019-12-31 | 2019-12-31 | Tube plate heat protection structure for fluidized bed gasification waste heat boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211625198U (en) |
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2019
- 2019-12-31 CN CN201922496367.8U patent/CN211625198U/en active Active
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Address after: 8 / F, building e, Hefeng creative Plaza, 435 Jiangdong North Road, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: Ningbo Antai Environmental Chemical Engineering Design Co.,Ltd. Address before: 8 / F, building e, Hefeng creative Plaza, 435 Jiangdong North Road, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO RESEARCH & DESIGN INSTITUTE OF CHEMICAL INDUSTRY CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |