CN210165352U - Straight-through type synthetic waste heat boiler - Google Patents
Straight-through type synthetic waste heat boiler Download PDFInfo
- Publication number
- CN210165352U CN210165352U CN201920903079.7U CN201920903079U CN210165352U CN 210165352 U CN210165352 U CN 210165352U CN 201920903079 U CN201920903079 U CN 201920903079U CN 210165352 U CN210165352 U CN 210165352U
- Authority
- CN
- China
- Prior art keywords
- heat exchange
- tube
- waste heat
- support plate
- heat boiler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model relates to a straight-through type synthetic waste heat boiler, which comprises a cylinder body, two tube plates arranged at the two ends of the cylinder body, a tube box respectively connected with the two tube plates, and a heat exchange tube arranged in the cylinder body; the heat exchange tubes are distributed along the axial direction of the cylinder body, and two ends of each heat exchange tube are respectively fixed on the tube plates; the heat exchange tube is provided with a circulating water inlet and a steam outlet, and the heat exchange tube is provided with a bent structure. Compared with the prior art, the utility model discloses a thermal stress and the thermal fatigue destruction of heat exchange tube junction welding seam are eliminated to crooked type heat exchange tube, have advantages such as equipment life height, economic benefits are good, safe in utilization, the equipment of being convenient for.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry equipment technique and specifically relates to a synthetic exhaust-heat boiler of through-type is related to.
Background
The synthetic waste heat boiler is a key device for recycling industrial waste heat of synthetic ammonia, and bears harsh process conditions of high temperature, high pressure, hydrogen and nitrogen erosion and the like for a long time. Typical failure and failure modes of waste heat boilers include thermal stress, thermal fatigue cracking, hydrogen corrosion at high temperatures, and the like; the main failure part is usually located at the hot end tube plate and the connection part of the tube plate and the heat exchange tube, namely, the welding seam has cracks. The structure of the existing synthetic waste heat boiler is shown in figure 1, and the structure is used by dozens of domestic enterprises, but the service life is short, leakage often occurs, so that the enterprises stop production and maintenance, and great economic loss is caused. The reason for short service life is that steam enters the steam drum gas side from the ascending pipe in the use process of the synthesis waste heat boiler, water in the steam drum enters the lower side of the equipment from the descending pipe, the water is heated by the synthesis gas and then moves upwards to generate a steam-water mixture to enter the ascending pipe, the water circulation process enables the upper and lower temperature difference of the heat exchange pipe bundle to be large, particularly when the boiler supplies water, the temperature difference is large, the temperature fluctuation is serious, an expansion joint arranged on a shell of the equipment can only eliminate the axial temperature difference and cannot eliminate the radial (namely, upper and lower) temperature difference, the upper and lower temperature difference of the common waste heat boiler can reach about 100 ℃, therefore, the difference of the thermal expansion and cold contraction conditions of the upper and lower heat exchange pipes is large, the connecting welding seam of each heat exchange pipe and the pipe plate is in the thermal stress and thermal fatigue state of different degrees, and meanwhile, under the combined action of hydrogen embrittlement and hydrogen corrosion, microcracks occur on the connecting seam of the heat exchange pipe plate at the hot end and the heat exchange pipe Accidents, which are common failure modes of such scrap pots. For a waste heat boiler used on a synthetic ammonia device producing more than 30 ten thousand tons every year, if leakage occurs, an enterprise must stop operating system equipment, maintain the system equipment, stop production and maintain the system equipment once, and lose thousands of yuan; therefore, a straight-through type synthetic waste heat boiler needs to be designed, and cracks at the welding seam connection position between the heat exchange tube and the tube plate caused by the temperature difference in the radial direction are avoided, so that the service life of equipment is prolonged, and the economic benefit of enterprises is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a straight-through type synthetic waste heat boiler.
The purpose of the utility model can be realized through the following technical scheme:
a straight-through type synthetic waste heat boiler comprises a cylinder body, two tube plates arranged at two ends of the cylinder body, tube boxes respectively connected with the two tube plates, and heat exchange tubes arranged in the cylinder body; the heat exchange tubes are distributed along the axial direction of the cylinder body, and two ends of each heat exchange tube are respectively fixed on the tube plates; the heat exchange tube is provided with a circulating water inlet and a steam outlet, and the heat exchange tube is provided with a bent structure.
In the prior art, a straight-tube heat exchange tube is adopted, the heat exchange tube cannot eliminate the radial (namely, upper and lower) temperature difference of the heat exchanger, and the upper and lower temperature difference of a common waste heat boiler can reach about 100 ℃, so that the condition of expansion with heat and contraction with cold of the upper and lower heat exchange tubes is greatly different, the connecting welding seam of each heat exchange tube and the tube plate is in a thermal stress and thermal fatigue state of different degrees, and the welding seam between the end part of the heat exchange tube and the tube plate is easy to crack; and the utility model discloses in adopt the heat exchange tube of crooked type structure, the absorption heat exchange tube that crooked type structure can be fine because the inflation of the different degrees that the cold depreciation of thermal expansion formed, the thermal stress between heat exchange tube tip and the tube sheet is reduced greatly, avoids the welding seam between heat exchange tube tip and the tube sheet because thermal stress is impaired, the fracture.
Preferably, the bent structure is a U-shaped structure.
And the U-shaped structure is adopted, so that the processing and the manufacturing are convenient, and the installation of the heat exchange tube is also convenient.
Preferably, the bottom communication position of the U-shaped structure faces to the horizontal direction.
Preferably, the U-shaped structure of all the heat exchange tubes is oriented in the same direction.
Together, the utility model discloses still designed the backup pad that matches with the heat exchange tube that has U type structure, be equipped with the backup pad in the barrel, the heat exchange tube is fixed in the backup pad.
Preferably, the support plate is of an arch structure, and a through hole matched with the U-shaped structure is formed in the support plate.
Preferably, the support plate is a split-type support plate, and comprises a first support plate and a second support plate which are matched in shape, and a spacing space is arranged between the first support plate and the second support plate; and the first supporting plate and the second supporting plate are provided with matched semicircular holes, and the two matched semicircular holes and the spacing space form through holes matched with the U-shaped structure.
Each heat exchange tube is provided with a bending structure at one end close to the synthesis gas inlet.
And an expansion joint is arranged on the cylinder body.
The utility model also comprises a steam pocket, the circulating water inlet is connected with the circulating water outlet of the steam pocket through a down pipe, and the steam outlet is connected with the steam inlet of the steam pocket through an ascending pipe; and a boiler water feeding port is also arranged on the steam pocket.
Compared with the prior art, the utility model has the advantages of it is following:
(1) for a straight-through waste heat boiler, the heat exchange tubes with the bent structures are adopted, and the structures can absorb different expansion caused by different temperatures among the heat exchange tubes, so that the thermal stress and thermal fatigue damage of welding seams at the joints of the heat exchange tubes are eliminated, and the huge economic loss of factory production halt caused by equipment leakage accidents is thoroughly avoided;
(2) according to the heat exchange tube with the bending structure, the utility model designs the supporting plate matched with the bending structure, the supporting plate is convenient for tube penetration and assembly during equipment manufacturing, and the supporting for the heat exchange tube is more reliable;
(3) the heat exchange tube is provided with a bending structure, so that the heat exchange contact area is increased, and the heat exchange efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of a comparative example;
FIG. 2 is a view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of an embodiment;
FIG. 4 is a view taken along line A-A of FIG. 3;
FIG. 5 is a schematic structural view of a heat exchange tube;
FIG. 6 is a schematic structural view of the support plate;
in the figure, 1 is a tube box, 2 is a tube plate, 3 is a heat exchange tube, 31 is a U-shaped structure, 4 is a cylinder, 5 is a support plate, 51 is a first support plate, 52 is a second support plate, 6 is an expansion joint, 7 is a steam pocket, 8 is an ascending tube, and 9 is a descending tube.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Comparative example
The comparative example is a conventional waste heat boiler, and as shown in fig. 1 and 2, the waste heat boiler comprises a cylinder 4, two tube plates 2 arranged at two ends of the cylinder 4, tube boxes 1 respectively connected with the two tube plates 2, heat exchange tubes 3 arranged in the cylinder 4, and a steam drum 7 connected with the shell side of the cylinder through a pipeline; the heat exchange tubes 3 are distributed along the axial direction of the barrel 4, and two ends of each heat exchange tube 3 are respectively fixed on the tube plate 2; the barrel 4 is provided with a circulating water inlet and a steam outlet, the circulating water inlet is connected with the circulating water outlet of the steam drum 7 through a downcomer 9, and the steam outlet is connected with the steam inlet of the steam drum 7 through an ascending pipe 8; the steam pocket is also provided with a boiler water feeding port; a supporting plate 5 for fixing the heat exchange tube is arranged in the barrel 4, and an expansion joint is further arranged on the barrel 4.
When the synthetic waste heat boiler is used, steam enters the gas side of a steam pocket 7 from an ascending pipe 8, water in the steam pocket 7 enters the lower side of the waste heat boiler from a descending pipe 9, the water is heated by synthesis gas and then moves upwards to generate a steam-water mixture and enters the ascending pipe 8, the water circulation process enables the upper and lower parts of a heat exchange pipe bundle to have larger temperature difference, particularly when the boiler supplies water, the temperature difference is larger, the temperature fluctuation is more serious, the equipment is leaked within 6 months to 1 year of use, because an expansion joint arranged on a shell only can eliminate the axial temperature difference and cannot eliminate the radial temperature difference, namely the upper and lower temperature differences, and the upper and lower temperature differences reach about 100 ℃, therefore, the connecting welding seam of each heat exchange pipe and the pipe plate is in a thermal stress and thermal fatigue state of different degrees, and simultaneously, under the combined action of hydrogen embrittlement and hydrogen corrosion, the waste heat boiler generates a micro-crack accident at the welding seam at the connecting part of the heat exchange pipe plate and the heat exchange pipe, the waste heat boiler is a common failure mode of the waste heat boiler, and if leakage occurs in the waste heat boiler used in the ammonia synthesis device which produces more than 30 ten thousand tons every year, an enterprise needs to stop operating system equipment, maintain the system equipment, stop production and maintain once, and lose thousands of yuan. Therefore, the comparative example has the defects of short service life, frequent leakage, production halt and maintenance of enterprises, and great economic loss.
Examples
A straight-through type synthetic waste heat boiler, as shown in fig. 3 and 4, comprises a cylinder 4, two tube plates 2 arranged at two ends of the cylinder 4, a tube box 1 respectively connected with the two tube plates 2, a heat exchange tube 3 arranged inside the cylinder 4, and a support plate 5 arranged inside the cylinder 4; the heat exchange tubes 3 are distributed along the axial direction of the barrel 4, and two ends of each heat exchange tube 3 are respectively fixed on the tube plate 2; the middle part of the heat exchange tube 3 is fixed through a support plate 5; the barrel 4 is provided with a circulating water inlet and a steam outlet, the circulating water inlet is connected with the circulating water outlet of the steam drum 7 through a downcomer 9, and the steam outlet is connected with the steam inlet of the steam drum 7 through an ascending pipe 8; one end of each heat exchange tube 3 close to the synthesis gas inlet is provided with a bent structure which is a U-shaped structure 31, as shown in fig. 5, the communication part of the bottom of the U-shaped structure 31 faces the cylinder wall direction of the cylinder 4, and the U-shaped structures 31 of all the heat exchange tubes 3 face the same direction, so that the heat exchange tubes are conveniently and fixedly connected with the support plate 5. The support plate 5 is matched with the heat exchange tube with a bent structure, the support plate 5 is a support plate with an arch structure, and the support plate 5 is provided with a through hole matched with the U-shaped structure 31, specifically, the support plate 5 is a support plate with a split structure, as shown in fig. 6, and comprises a first support plate 51 and a second support plate 52 which are matched in shape, and a spacing space is arranged between the first support plate and the second support plate; the first support plate 51 and the second support plate 52 are provided with matching semicircular holes, and the two matching semicircular holes and the spacing space form through holes matched with the U-shaped structure 31.
By designing the bent heat exchange tubes, the structure can absorb different expansion caused by different temperatures among the heat exchange tubes, thereby eliminating the thermal stress and thermal fatigue damage of the welding seams at the joints of the heat exchange tubes and thoroughly avoiding huge economic loss of factory production stoppage caused by equipment leakage accidents; according to the heat exchange tube with the bent structure, the supporting plate matched with the heat exchange tube is designed, the supporting plate is convenient to penetrate and assemble when equipment is manufactured, and the supporting for the heat exchange tube is more reliable.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A straight-through type synthetic waste heat boiler comprises a cylinder body (4), two tube plates (2) arranged at two ends of the cylinder body (4), a tube box (1) respectively connected with the two tube plates (2), and a heat exchange tube (3) arranged in the cylinder body (4); the heat exchange tubes (3) are distributed along the axial direction of the barrel (4), and two ends of each heat exchange tube (3) are respectively fixed on the tube plate (2); the cylinder body (4) is provided with a circulating water inlet and a steam outlet and is characterized in that,
the heat exchange tube (3) is provided with a bending structure.
2. A once-through synthetic waste heat boiler according to claim 1, wherein the bent-over structure is a U-shaped structure (31).
3. A once-through synthetic waste heat boiler according to claim 2, wherein the bottom connection of the U-shaped structure (31) is oriented horizontally.
4. A once-through synthetic waste heat boiler according to claim 3, wherein the U-shaped structures (31) of all heat exchange tubes (3) are oriented in the same direction.
5. A once-through synthetic waste heat boiler according to claim 4, wherein a support plate (5) is provided in the shell (4), and the heat exchange tubes (3) are fixed to the support plate (5).
6. A once-through synthetic waste heat boiler according to claim 5, wherein the support plate (5) is an arch-shaped support plate and the support plate (5) is provided with through holes matching the U-shaped structure (31).
7. A once-through synthetic waste heat boiler according to claim 6, wherein the support plate (5) is a split-type structure support plate comprising a first support plate (51) and a second support plate (52) which are matched in shape and between which a spacing space is provided; the first supporting plate (51) and the second supporting plate (52) are provided with matched semicircular holes, and the two matched semicircular holes and the spacing space form through holes matched with the U-shaped structure (31).
8. A once-through synthetic waste heat boiler according to claim 1, wherein each heat exchange tube (3) is provided with a bent type structure at an end adjacent to the syngas inlet.
9. A once-through synthetic waste heat boiler according to claim 1, wherein the shell (4) is provided with an expansion joint (6).
10. A once-through synthetic waste heat boiler according to claim 1, further comprising a steam drum (7), wherein the circulating water inlet is connected to the circulating water outlet of the steam drum through a downcomer (9), and the steam outlet is connected to the steam inlet of the steam drum through an upcomer (8); and a boiler water feeding port is also arranged on the steam pocket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920903079.7U CN210165352U (en) | 2019-06-14 | 2019-06-14 | Straight-through type synthetic waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920903079.7U CN210165352U (en) | 2019-06-14 | 2019-06-14 | Straight-through type synthetic waste heat boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210165352U true CN210165352U (en) | 2020-03-20 |
Family
ID=70171737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920903079.7U Active CN210165352U (en) | 2019-06-14 | 2019-06-14 | Straight-through type synthetic waste heat boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210165352U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111462617A (en) * | 2020-05-13 | 2020-07-28 | 京东方科技集团股份有限公司 | Display device |
-
2019
- 2019-06-14 CN CN201920903079.7U patent/CN210165352U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111462617A (en) * | 2020-05-13 | 2020-07-28 | 京东方科技集团股份有限公司 | Display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204717647U (en) | U-tube formula waste heat boiler | |
| CN105737182A (en) | Smoke in-depth cooler | |
| CN210165352U (en) | Straight-through type synthetic waste heat boiler | |
| CN210242495U (en) | Heat exchanger | |
| CN203963991U (en) | Combined air preheater | |
| CN201593781U (en) | Water-cooling support device of residual heat boiler | |
| CN205137398U (en) | Synthetic gas waste heat boiler | |
| CN210165351U (en) | Synthetic waste heat boiler with superheated steam as byproduct | |
| CN205535903U (en) | Flue gas deep cooling ware | |
| CN201706527U (en) | Combination air preheater | |
| CN204881281U (en) | High temperature is poor, high pressure is poor, easily maintain steam generator | |
| CN203100525U (en) | Tube box structure for tube type heat exchanger | |
| CN107400523B (en) | Efficient heat conduction waste heat recovery system for coke oven ascending pipe | |
| CN215982502U (en) | Waste heat recovery boiler superheater structure | |
| CN202973975U (en) | Hydrochloric acid (HCI) combustion gas indirect heater | |
| CN110630995A (en) | Positive pressure horizontal water pipe waste heat boiler | |
| CN204554787U (en) | The external bed for circulating fluidized bed boiler secondary medium temperature overheater improved | |
| CN211876082U (en) | Spiral coil pipe structure for absorbing expansion difference between shell and heating surface | |
| CN215982505U (en) | Wall-type reheater tube structure capable of preventing cracking and leakage of power station boiler | |
| CN220018253U (en) | Three-stage series heat exchanger | |
| CN214223049U (en) | Three-sleeve synthetic waste heat boiler | |
| CN216245705U (en) | Large-scale high-pressure spiral coil pipe waste heat boiler | |
| CN211178050U (en) | Quenching heat exchanger for cooling high-temperature gas behind furnace | |
| CN214332784U (en) | Novel high-temperature air preheater | |
| CN207962617U (en) | The superheater improved structure of carbon black waste heat boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |