CN217383891U - Acrylonitrile reaction gas cooler - Google Patents
Acrylonitrile reaction gas cooler Download PDFInfo
- Publication number
- CN217383891U CN217383891U CN202220981603.4U CN202220981603U CN217383891U CN 217383891 U CN217383891 U CN 217383891U CN 202220981603 U CN202220981603 U CN 202220981603U CN 217383891 U CN217383891 U CN 217383891U
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- heat exchange
- reaction gas
- gas cooler
- plate
- protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model belongs to the technical field of the acrylonitrile production, concretely relates to acrylonitrile reaction gas cooler. The utility model discloses an acrylonitrile reaction gas cooler, including last pipe case, upper tube plate and heat exchange tube, upper tube plate top is equipped with the protection shield, and the trompil is gone up to the protection shield, just to each heat exchange tube, and the inside sleeve pipe that is equipped with of heat exchange tube upper end, the protection shield is run through at the sleeve pipe top; a flange is arranged between the upper tube plate and the upper tube box, the adjacent position of the flange and the protection plate is a right-angle airflow dead zone, a solid protection ring is arranged at the right-angle airflow dead zone, and a welding spot is arranged at the connecting position of the protection ring and the flange. The utility model has the advantages of being scientific and reasonable in design, effectively solved the erosion problem and the corrosion problems of solder joint when clearing up on line, prolonged the life of cooler.
Description
Technical Field
The utility model belongs to the technical field of the acrylonitrile production, concretely relates to acrylonitrile reaction gas cooler.
Background
The raw materials of the acrylonitrile production device are propylene, liquid ammonia and air, and react in the reactor under the action of the catalyst to generate an acrylonitrile main product and simultaneously emit a large amount of heat, and the gas at the outlet of the reactor contains acrylonitrile, water, nitrogen, oxygen, ammonia, hydrocyanic acid, acetonitrile and other products and also contains a small amount of catalyst powder.
The reaction gas temperature is about 430 ℃ and the pressure is about 0.6kg/cm 2 The reaction gas is cooled down, the reaction gas cooler plays a role, the reaction gas flows away from a tube side, and the boiler water flows away from a shell side. The boiler water inlet temperature was about 160 c, heated to 210 c, and the reactant gas inlet temperature was 430 c, cooled to 210 c. The design requires that the pressure difference of the inlet and the outlet of the reaction gas is between 0.1 and 0.3kg/cm 2 。
With the prolonging of the production running time of the device, catalyst particles (powder) can be accumulated in the reaction gas cooler to block a tube pass, so that the pressure drop of the reaction gas cooler is increased, when the pressure drop is increased to a certain value, the device cannot normally run, and the reaction gas cooler needs to be cleaned on line, mainly the catalyst in the reaction gas cooler is cleaned. The ammonium sulfate granule of online clearance usefulness can erode the welding seam on the tube sheet, and the time of having a long time can cause individual tube bank to reveal. Meanwhile, a small amount of ammonium sulfate is remained at the right angle between the wall of the heat exchanger and the tube bundle plate of the heat exchanger, and after the ammonium sulfate is melted at high temperature, the weld joint of the heat exchange tube at the position can be corroded, so that leakage of individual tube bundles nearby is caused.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims at providing an acrylonitrile reaction gas cooler, its design scientific and reasonable has effectively solved when online clearance to the erosion problem and the corrosion problem of solder joint, has prolonged the life of cooler.
The utility model discloses an acrylonitrile reaction gas cooler, including last pipe case, upper tube plate and heat exchange tube, upper tube plate top is equipped with the protection shield, and the trompil is gone up to the protection shield, just to each heat exchange tube, and the inside sleeve pipe that is equipped with of heat exchange tube upper end, the protection shield is run through at the sleeve pipe top; a flange is arranged between the upper tube plate and the upper tube box, the adjacent position of the flange and the protection plate is an airflow dead zone at a right angle, a solid protection ring is arranged at the airflow dead zone at the right angle, and a welding spot is arranged at the connecting position of the protection ring and the flange.
Preferably, the outer diameter of the heat exchange tube is 32 +/-2 mm, and the wall thickness of the heat exchange tube is 2-3 mm.
Preferably, the material of the protection plate is chromium molybdenum steel.
Preferably, the thickness of the protective plate is 10 to 20 mm.
Preferably, the material of the protection ring is chromium molybdenum steel.
Preferably, the number of sleeves is 2-4.
Preferably, the angle of the bevel of the protective ring is 120 ° to 150 °.
The utility model is provided with the protection plate, the protection plate is provided with the holes, and the hole diameter is moderate just facing each heat exchange tube, thereby not only ensuring that the resistance is not increased, but also protecting the welding spots of the heat exchange tubes from erosion of cleaning particles; the sleeve is arranged for fixing the protection plate, the number of the sleeves is moderate, the resistance is increased when the number of the sleeves is large, and the protection plate which cannot be well fixed is reduced; at the right angle department air current blind spot of cooler wall and cooler tube bank tube sheet, a small amount of solid ammonium sulfate granule scatters here, can not blown away by hot fluid, and (430 ℃) ammonium sulfate melts under the high temperature, and flow down, corrodes near heat exchange tube welding seam, is the leading cause that outside heat exchange tube leaked, the utility model discloses set up the protection ring here, avoid the ammonium sulfate granule to pile up to the protection ring has the effect of bounce-back ammonium sulfate granule, makes it can not stop in right angle department air current blind spot, can not corrode the heat exchange tube welding seam here.
Compared with the prior art, the utility model, following beneficial effect has:
the utility model has the advantages of being scientific and reasonable in design, effectively solved the erosion problem and the corrosion problems of solder joint when clearing up on line, prolonged the life of cooler.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 without a protection ring;
FIG. 3 is a schematic view of the block diagram of FIG. 1 with a protection ring;
in the figure: 1. an upper pipe box; 2. an upper tube sheet; 3. a sleeve; 4. a protection plate; 5. a heat exchange pipe; 6. a flange; 7. dead zones of air flow at the right angles; 8. welding spots; 9. a guard ring.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1, an acrylonitrile reaction gas cooler comprises an upper tube box 1, an upper tube plate 2 and heat exchange tubes 5, wherein a protection plate 4 is arranged above the upper tube plate 2, holes are formed in the protection plate 4 and are opposite to each heat exchange tube 5, a sleeve 3 is arranged inside the upper end of each heat exchange tube 5, and the top of the sleeve 3 penetrates through the protection plate 4; a flange 6 is arranged between the upper tube plate 2 and the upper tube box 1, the adjacent position of the flange 6 and the protection plate 4 is an airflow dead zone 7 at a right angle, a solid protection ring 9 is arranged at the airflow dead zone 7 at the right angle, and a welding spot 8 is arranged at the connecting position of the protection ring 9 and the flange 6.
The external diameter of the heat exchange tube 5 is 32mm, and the wall thickness of the heat exchange tube 5 is 2 mm.
The protective plate 4 is made of chromium molybdenum steel.
The thickness of the protective plate 4 is 15 mm.
The protection ring 9 is made of chromium molybdenum steel.
The number of the sleeves 3 is 2.
The bevel angle of the protection ring is 135 degrees.
The utility model is provided with the protection plate 4, the protection plate 4 is provided with the hole and is opposite to each heat exchange tube 5, thereby not only ensuring that the resistance is not increased, but also protecting the welding spot of the heat exchange tube 5 from erosion of cleaning particles; a sleeve 3 is provided for the purpose of fixing the protection plate 4; at the right angle department air current blind spot 7 of cooler wall and cooler tube bank tube sheet, a small amount of solid ammonium sulfate granule scatters here, can not blown away by hot fluid, and (430 ℃) ammonium sulfate melts under the high temperature, and flow down, corrodes near 5 welding seams of heat exchange tube, the utility model discloses set up protection ring 9 here, avoid the ammonium sulfate granule to pile up to protection ring 9 has the effect of bounce-back ammonium sulfate granule, makes it can not stop in right angle department air current blind spot 7, can not corrode 5 welding seams of heat exchange tube here.
Claims (6)
1. The utility model provides an acrylonitrile reaction gas cooler, includes last pipe case (1), upper tube plate (2) and heat exchange tube (5), its characterized in that: a protection plate (4) is arranged above the upper tube plate (2), holes are formed in the protection plate (4) and are opposite to each heat exchange tube (5), a sleeve (3) is arranged inside the upper end of each heat exchange tube (5), and the top of each sleeve (3) penetrates through the protection plate (4); a flange (6) is arranged between the upper tube plate (2) and the upper tube box (1), the adjacent position of the flange (6) and the protection plate (4) is a right-angle airflow dead zone (7), a solid protection ring (9) is arranged at the right-angle airflow dead zone (7), and a welding spot (8) is arranged at the position where the protection ring (9) is connected with the flange (6).
2. The acrylonitrile reaction gas cooler of claim 1, wherein: the outer diameter of the heat exchange tube (5) is 32 +/-2 mm, and the wall thickness of the heat exchange tube (5) is 2-3 mm.
3. The acrylonitrile reaction gas cooler of claim 1, wherein: the protective plate (4) is made of chromium molybdenum steel.
4. The acrylonitrile reaction gas cooler of claim 1 or 3, wherein: the thickness of the protective plate (4) is 10-20 mm.
5. The acrylonitrile reaction gas cooler of claim 1, wherein: the protection ring (9) is made of chromium molybdenum steel.
6. The acrylonitrile reaction gas cooler of claim 1, wherein: the number of the sleeves (3) is 2-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220981603.4U CN217383891U (en) | 2022-04-25 | 2022-04-25 | Acrylonitrile reaction gas cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220981603.4U CN217383891U (en) | 2022-04-25 | 2022-04-25 | Acrylonitrile reaction gas cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217383891U true CN217383891U (en) | 2022-09-06 |
Family
ID=83108831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220981603.4U Active CN217383891U (en) | 2022-04-25 | 2022-04-25 | Acrylonitrile reaction gas cooler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217383891U (en) |
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2022
- 2022-04-25 CN CN202220981603.4U patent/CN217383891U/en active Active
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