A nitrogen heater tube box capable of eliminating thermal stress

Abstract

The present invention discloses a nitrogen heater pipe box capable of eliminating thermal stress, relating to the technical field of nitrogen heater pipe boxes, comprising a mounting head; the mounting head comprises a shell; one end of the shell is open, and the open end of the shell is integrally provided with a first connecting flange; a partition plate is integrally provided inside the shell; the interior of the shell is divided into a first chamber and a second chamber by the partition plate; wherein the first chamber is through-connected with the outlet; the second chamber is through-connected with the inlet; a pressure-sealed inlet hole is provided on the side wall of the shell away from the open end; the shell is fixedly installed with the pipe box through the first connecting flange; when in use, the shell is fixedly installed with the first connecting flange and the second connecting flange on the outer shell; after installation is completed, the second chamber inside the shell is connected with the guide chamber through the through hole opened in the sealing plate, and the inlet through which the second chamber is connected is connected with the delivery pipeline, so that the medium enters the guide chamber through the second chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of nitrogen heater tube boxes, in particular to a nitrogen heater tube box capable of eliminating thermal stress. Background Art

[0002] In an air separation plant, the nitrogen heater is a critical component. The performance of the tube box directly affects the operating efficiency and overall stability of the nitrogen heater. The nitrogen heater plays an indispensable role in the air separation plant, primarily utilizing the heat released by steam to heat the contaminated nitrogen gas, thereby heating and activating the molecular sieve. Its performance directly determines the proper functioning of the molecular sieve and has a crucial impact on the stable operation of the entire air separation plant. The tube box, as a key component of the nitrogen heater, undertakes important tasks such as distributing and collecting tube-side fluids and connecting heat exchange tubes to external pipelines. Its performance directly affects the heat exchange efficiency and operational reliability of the nitrogen heater.

[0003] In a U-shaped tubular nitrogen heater, saturated steam typically enters the tube side and subcooled water exits. The temperature difference between the two can sometimes reach over 100°C. Such a large temperature difference can cause significant thermal stress on the splitter plates. This thermal stress can lead to a series of serious problems, such as deformation of the tube box cylinder, which in turn can cause tube box seal failure and steam leakage. This not only reduces the heat exchange efficiency of the nitrogen heater, but can also affect the normal operation of the entire air separation system and even cause safety accidents. Thermal stress can also cause cracks in the splitter plates, shortening the tube box service life and increasing equipment maintenance costs and downtime.

[0004] A search revealed Chinese patent publication number CN201821197755.5, which discloses a contaminated nitrogen heater tube box structure. The tube box shell includes a tube box shell and a tube sheet. A first partition plate, a second partition plate, a third partition plate, and a first partition plate are disposed in the tube box shell in a sequential order from top to bottom. The first partition plate, the second partition plate, the third partition plate, the first partition plate, and the second partition plate divide three U-shaped tube bundles into six flow paths.

[0005] In the above-mentioned patent, the tube bundle is divided into multiple processes by multiple partitions. Although the "water hammer" phenomenon is avoided to a certain extent, this method makes the tube box structure complicated, increases the manufacturing difficulty and cost, and too many partitions will occupy a certain amount of space, affecting the flow and distribution of the fluid in the tube box and reducing the heat exchange efficiency. Summary of the Invention

[0006] The object of the present invention is to provide a nitrogen heater pipe box capable of eliminating thermal stress. In this structure, the nitrogen heater pipe box is placed in a heating chamber, and the nitrogen inside the nitrogen heater pipe box is heated by steam. During the heating process, when the steam contacts the nitrogen heater pipe box, condensation occurs on the top of the nitrogen heater pipe box. The condensed water vapor has a cooling effect on the nitrogen heater pipe box when flowing downward. The condensed water vapor is discharged through a condensate discharge pipe connected to the bottom of the partition. At the same time, the uncondensed gas enters the cooling chamber through the uncondensed air holes opened in the upper semicircular plate. The water cools the uncondensed gas. At the same time, the water also acts on the partition, and the temperature is transferred to the partition of the heating chamber section through the partition of the cooling chamber section. The partition achieves a further cooling effect on the nitrogen heater pipe box, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box during operation, thereby solving the problems of the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A nitrogen heater tube box capable of eliminating thermal stress comprises a mounting head; the mounting head comprises a shell; one end of the shell is open, and the open end of the shell is integrally provided with a first connecting flange; a partition plate is integrally provided inside the shell; the interior of the shell is divided into a first chamber and a second chamber by the partition plate;

[0009] Wherein; the first chamber is connected to the outlet; the second chamber is connected to the inlet; a pressure-sealed inlet is provided on the side wall of the shell away from the open end; the shell is fixedly mounted to the pipe box through a first connecting flange;

[0010] The pipe box includes a shell; one end of the shell is integrally provided with a second connecting flange; the second connecting flange and the first connecting flange are detachably mounted;

[0011] A nitrogen heater assembly is fixedly mounted inside the shell; the nitrogen heater assembly includes a sealing plate; the sealing plate is integrally arranged with the inner wall of the shell; a partition is integrally arranged on one side of the sealing plate; a lower semicircular plate is arranged at the bottom of the partition; a guide cavity is formed between the lower semicircular plate and the sealing plate; a guide plate is arranged inside the guide cavity; two groups of guide plates are provided, one group is fixedly mounted on the inner wall of the shell, and the other group is integrally arranged with the partition; the guide plate integrally arranged with the partition is located between the guide plate fixedly mounted on the inner wall of the shell;

[0012] The nitrogen heater pipe box is fixedly mounted on the U-shaped tube at one end away from the sealing plate; the U-shaped tube is located on both sides of the partition plate, and the U-shaped tube at one end away from the nitrogen heater pipe box passes through the lower semicircular plate and extends into the diversion cavity;

[0013] A through hole is formed inside the sealing plate, and the second chamber is connected to the diversion cavity through the through hole;

[0014] As a further technical solution of the present invention, the top of the partition is also integrally provided with an upper semicircular plate; a plurality of uncondensed air holes are opened on the upper semicircular plate; a cooling chamber is formed between the upper semicircular plate and the lower semicircular plate;

[0015] As a further technical solution of the present invention, the upper semicircular plate is located on one side of the cooling chamber and is integrally provided with an inclined plate; a heating chamber is formed between the upper semicircular plate and the sealing plate; a nitrogen heater pipe box is installed in the heating chamber; one end of the nitrogen heater pipe box passes through the sealing plate and is in communication with the first chamber;

[0016] As a further technical solution of the present invention, the top of the housing is integrally provided with a drain inlet and a steam inlet; wherein the drain inlet is located at the top of the inclined plate inside the cooling chamber; and the steam inlet is located at the top of the heating chamber between the upper semicircular plate and the sealing plate;

[0017] As a further technical solution of the present invention, the bottom of the shell is further provided with a drain outlet; the drain outlet is located at the bottom of the cooling chamber; the shell is fixedly mounted on the support;

[0018] As a further technical solution of the present invention, a condensate discharge pipe is fixedly installed through the bottom of the partition between the upper semicircular plate and the sealing plate; the condensate discharge pipe penetrates the side wall of the shell and extends to the outside.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the present invention, when in use, the housing is fixedly installed through the first connecting flange and the second connecting flange on the outer shell. After the installation is completed, the second chamber inside the housing is connected to the guide cavity through the through hole opened on the sealing plate, and the inlet connected through the second chamber is connected to the delivery pipeline, so that the medium enters the guide cavity through the second chamber;

[0021] According to the present invention, after the medium enters the guide cavity, the guide plate at the bottom of the partition and the guide plate on the inner wall of the shell achieve a guiding effect on the medium, and the upper and lower guide plates are used to transmit the medium to a plurality of U-shaped tubes. One end of the U-shaped tube away from the guide cavity is fixedly connected to the nitrogen heater tube box to achieve heating of the medium in the nitrogen heater tube box. After the medium is heated, it is transmitted to the first chamber, and the outlet on the first chamber is connected to the connecting pipe to achieve transmission of the heated medium to a desired location.

[0022] The present invention, when heating the nitrogen heater pipe box, transports steam into the heating chamber through a steam inlet provided on the shell, and heats the medium inside the nitrogen heater pipe box by the steam. At the same time, when the steam contacts the nitrogen heater pipe box, condensation occurs on the top thereof. The condensed steam flows downward through the outer wall of the nitrogen heater pipe box, achieving a cooling effect of the nitrogen heater pipe box by steam water. The condensed steam water is discharged through a condensate discharge pipe installed at the bottom of the partition.

[0023] According to the present invention, there is uncondensed steam in the heating chamber. The uncondensed steam enters the cooling chamber through the uncondensed air holes provided on the upper semicircular plate, and water is injected into the cooling chamber through the drain inlet to achieve mixing of the uncondensed steam and water. The uncondensed steam is then discharged through the drain outlet provided at the bottom of the shell. At the same time, the water injected through the drain inlet also acts on the partition of the cooling chamber section, and the partition of the cooling chamber section is used to achieve a cooling effect on the partition of the heating chamber section. The partition simultaneously cools the nitrogen heater pipe box, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box and avoiding deformation of the nitrogen heater pipe box during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0025] Figure 2 In the present invention Figure 1 Schematic diagram of the bottom structure.

[0026] Figure 3 In the present invention Figure 1 side view.

[0027] Figure 4 In the present invention Figure 3 Middle AA section view.

[0028] Figure 5 In the present invention Figure 1 Schematic diagram of the splitting.

[0029] Figure 6 In the present invention Figure 5 Schematic diagram of the bottom structure of the nitrogen heater assembly.

[0030] Figure 7 In the present invention Figure 5 Schematic diagram of the internal structure of the mounting head.

[0031] In the figure: 1-mounting head, 10-shell, 11-outlet, 12-inlet, 13-pressure sealing inlet, 14-first connecting flange, 15-first chamber, 16-second chamber, 17-partition plate, 2-pipe box, 20-shell, 21-drain inlet, 22-steam inlet, 23-support, 24-drain outlet, 25-second connecting flange, 3-nitrogen heater assembly, 30-condensate discharge pipe, 31-sealing plate, 32-nitrogen heater pipe box, 33-U-shaped tube, 34-lower semicircular plate, 35-guide plate, 36-partition plate, 37-through hole, 38-upper semicircular plate, 39-uncondensed air hole, 310-inclined plate, 311-guide chamber, 312-cooling chamber, 313-heating chamber. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-7 In an embodiment of the present invention, a nitrogen heater tube box capable of eliminating thermal stress includes a mounting head 1; the mounting head 1 includes a shell 10; one end of the shell 10 is open, and the open end of the shell 10 is integrally provided with a first connecting flange 14; the interior of the shell 10 is integrally provided with a partition plate 17; the interior of the shell 10 is divided into a first chamber 15 and a second chamber 16 by the partition plate 17;

[0034] wherein the first chamber 15 is in continuous communication with the outlet 11; the second chamber 16 is in continuous communication with the inlet 12; a pressure-sealed inlet hole 13 is provided on the side wall of the housing 10 away from the open end; the housing 10 is fixedly mounted to the pipe box 2 via a first connecting flange 14;

[0035] The pipe box 2 includes a housing 20; a second connecting flange 25 is integrally provided at one end of the housing 20; the second connecting flange 25 and the first connecting flange 14 are detachably mounted;

[0036] A nitrogen heater assembly 3 is fixedly installed inside the housing 20; the nitrogen heater assembly 3 includes a sealing plate 31; the sealing plate 31 is integrally arranged with the inner wall of the housing 20; a partition 36 is integrally arranged on one side of the sealing plate 31; a lower semicircular plate 34 is provided at the bottom of the partition 36; a guide cavity 311 is formed between the lower semicircular plate 34 and the sealing plate 31; a guide plate 35 is provided inside the guide cavity 311; the guide plates 35 are provided in two groups, one group is fixedly installed with the inner wall of the housing 20, and the other group is integrally arranged with the partition 36; the guide plates 35 integrally arranged with the partition 36 are located between the guide plates 35 fixedly installed with the inner wall of the housing 20;

[0037] The nitrogen heater pipe box 32 is fixedly mounted on the U-shaped tube 33 at one end away from the sealing plate 31; the U-shaped tube 33 is located on both sides of the partition 36, and the end of the U-shaped tube 33 away from the nitrogen heater pipe box 32 passes through the lower semicircular plate 34 and extends into the guide cavity 311;

[0038] A through hole 37 is formed inside the sealing plate 31 , and the second chamber 16 is connected to the guide cavity 311 through the through hole 37 ;

[0039] By adopting the above technical solution, when in use, the shell 10 is fixedly installed through the first connecting flange 14 and the second connecting flange 25 on the outer shell 20. After the installation is completed, the second chamber 16 inside the shell 10 is connected to the guide cavity 311 through the through hole 37 opened on the sealing plate 31, and the inlet 12 connected through the second chamber 16 is connected to the conveying pipeline, so that the medium enters the guide cavity 311 through the second chamber 16.

[0040] In this embodiment, an upper semicircular plate 38 is integrally provided on the top of the partition 36; a plurality of uncondensed air holes 39 are opened on the upper semicircular plate 38; a cooling chamber 312 is formed between the upper semicircular plate 38 and the lower semicircular plate 34;

[0041] By adopting the above technical solution, after the medium enters the guide cavity 311, the guide plate 35 at the bottom of the partition 36 and the guide plate 35 on the inner wall of the shell 20 achieve a guiding effect on the medium. The upper and lower guide plates 35 are used to transfer the medium to the multiple U-shaped tubes 33. The ends of the U-shaped tubes 33 away from the guide cavity 311 are fixedly connected to the nitrogen heater pipe box 32 to achieve heating of the medium in the nitrogen heater pipe box 32. After the medium is heated, it is transferred to the first chamber 15. The outlet 11 on the first chamber 15 is connected to the connecting pipe to achieve the transfer of the heated medium to the required location.

[0042] Furthermore, the upper semicircular plate 38 is integrally provided with an inclined plate 310 on one side of the cooling chamber 312; a heating chamber 313 is formed between the upper semicircular plate 38 and the sealing plate 31; a nitrogen heater pipe box 32 is installed in the heating chamber 313; one end of the nitrogen heater pipe box 32 passes through the sealing plate 31 and is in communication with the first chamber 15;

[0043] In this embodiment, the nitrogen heater pipe box 32 is fixedly mounted on the U-shaped tube 33 at one end away from the sealing plate 31; the U-shaped tube 33 is located on both sides of the partition 36, and the end of the U-shaped tube 33 away from the nitrogen heater pipe box 32 passes through the lower semicircular plate 34 and extends into the guide cavity 311;

[0044] By adopting the above technical solution, when heating the nitrogen heater pipe box 32, steam is transported into the heating chamber 313 through the steam inlet 22 provided on the shell 20, and the medium inside the nitrogen heater pipe box 32 is heated by the steam. At the same time, when the steam contacts the nitrogen heater pipe box 32, condensation occurs on the top thereof. The condensed steam flows downward through the outer wall of the nitrogen heater pipe box 32, achieving a cooling effect of the steam water on the nitrogen heater pipe box 32. The condensed steam water is discharged through the condensate discharge pipe 30 installed at the bottom of the partition 36;

[0045] The top of the housing 20 is integrally provided with a drain inlet 21 and a steam inlet 22; wherein the drain inlet 21 is located at the top of the inclined plate 310 inside the cooling chamber 312; and the steam inlet 22 is located at the top of the heating chamber 313 between the upper semicircular plate 38 and the sealing plate 31;

[0046] The bottom of the housing 20 is also provided with a drain outlet 24; the drain outlet 24 is located at the bottom of the cooling chamber 312; the housing 20 is fixedly mounted on the support 23;

[0047] A condensate discharge pipe 30 is fixedly installed at the bottom of the partition plate 36 between the upper semicircular plate 38 and the sealing plate 31; the condensate discharge pipe 30 passes through the side wall of the housing 20 and extends to the outside;

[0048] By adopting the above technical solution, there is still uncondensed steam in the heating chamber 313. The uncondensed steam enters the cooling chamber 312 through the uncondensed air holes 39 provided on the upper semicircular plate 38, and water is injected into the cooling chamber 312 through the drain inlet 21 to achieve mixing of the uncondensed steam and water. The mixture is then discharged through the drain outlet 24 provided at the bottom of the shell 20. At the same time, the water injected through the drain inlet 21 also acts on the partition 36 of the cooling chamber 312 section, and the partition 36 of the heating chamber 313 section is cooled by the partition 36 of the cooling chamber 312 section. The partition 36 simultaneously cools the nitrogen heater pipe box 32, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box 32 and avoiding deformation of the nitrogen heater pipe box 32 during long-term use.

[0049] The working principle of the present invention is as follows: when in use, the housing 10 is fixedly installed via the first connecting flange 14 and the second connecting flange 25 on the outer shell 20. After installation, the second chamber 16 inside the housing 10 is connected to the diversion chamber 311 through the through hole 37 provided on the sealing plate 31. The inlet 12 connected through the second chamber 16 is connected to the delivery pipeline, so that the medium enters the diversion chamber 311 through the second chamber 16.

[0050] After the medium enters the guide cavity 311, the guide plate 35 at the bottom of the partition 36 and the guide plate 35 on the inner wall of the housing 20 achieve a guiding effect on the medium. The upper and lower guide plates 35 are used to transfer the medium to the multiple U-shaped tubes 33. The ends of the U-shaped tubes 33 away from the guide cavity 311 are fixedly connected to the nitrogen heater pipe box 32 to achieve heating of the medium in the nitrogen heater pipe box 32. After the medium is heated, it is transferred to the first chamber 15. The outlet 11 on the first chamber 15 is connected to the connecting pipe to achieve the transfer of the heated medium to the required location.

[0051] When heating the nitrogen heater pipe box 32, steam is transported into the heating chamber 313 through the steam inlet 22 provided on the housing 20, and the medium inside the nitrogen heater pipe box 32 is heated by the steam. At the same time, when the steam contacts the nitrogen heater pipe box 32, condensation occurs on the top thereof. The condensed steam flows downward through the outer wall of the nitrogen heater pipe box 32, achieving a cooling effect of the nitrogen heater pipe box 32 by the steam water. The condensed steam water is discharged through the condensate discharge pipe 30 installed at the bottom of the partition 36;

[0052] There is still uncondensed steam in the heating chamber 313. The uncondensed steam enters the cooling chamber 312 through the uncondensed air holes 39 provided on the upper semicircular plate 38. Water is injected into the cooling chamber 312 through the drain inlet 21 to mix the uncondensed steam with the water, and then the uncondensed steam is discharged through the drain outlet 24 provided at the bottom of the shell 20. At the same time, the water injected through the drain inlet 21 also acts on the partition 36 of the cooling chamber 312 section, and the partition 36 of the heating chamber 313 section is cooled by the partition 36 of the cooling chamber 312 section. The partition 36 also cools the nitrogen heater pipe box 32, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box 32 and avoiding deformation of the nitrogen heater pipe box 32 during long-term use.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0054] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A nitrogen heater box capable of eliminating thermal stress, characterized by: The mounting head (1) comprises a housing (10); one end of the housing (10) is open, and the open end of the housing (10) is integrally provided with a first connecting flange (14); a partition plate (17) is integrally provided inside the housing (10); the interior of the housing (10) is divided into a first chamber (15) and a second chamber (16) by the partition plate (17); wherein the first chamber (15) is in continuous communication with the outlet (11); the second chamber (16) is in continuous communication with the inlet (12); a pressure-sealed inlet hole (13) is provided on the side wall of the housing (10) away from the opening end; and the housing (10) is fixedly mounted to the pipe box (2) via a first connecting flange (14); The pipe box (2) comprises a shell (20); a second connecting flange (25) is integrally provided at one end of the shell (20); the second connecting flange (25) and the first connecting flange (14) are detachably mounted; A nitrogen heater assembly (3) is fixedly installed inside the shell (20); the nitrogen heater assembly (3) includes a sealing plate (31); the sealing plate (31) is integrally arranged with the inner wall of the shell (20); a partition (36) is integrally arranged on one side of the sealing plate (31); a lower semicircular plate (34) is arranged at the bottom of the partition (36); a guide cavity (311) is formed between the lower semicircular plate (34) and the sealing plate (31); a guide plate (35) is arranged inside the guide cavity (311); two groups of guide plates (35) are provided, one group is fixedly installed with the inner wall of the shell (20), and the other group is integrally arranged with the partition (36); wherein the guide plate (35) integrally arranged with the partition (36) is located in the middle of the guide plate (35) fixedly installed with the inner wall of the shell (20); The nitrogen heater tube box (32) is fixedly mounted on one end thereof away from the sealing plate (31) and the U-shaped tube (33); the U-shaped tube (33) is located on both sides of the partition (36); and the U-shaped tube (33) is fixedly mounted on one end thereof away from the nitrogen heater tube box (32) and passes through the lower semicircular plate (34) and extends into the guide cavity (311); A through hole (37) is provided inside the sealing plate (31), and the second chamber (16) is connected to the guide cavity (311) through the through hole (37).

2. The nitrogen heater tube box capable of eliminating thermal stress according to claim 1, characterized in that: The top of the partition (36) is also integrally provided with an upper semicircular plate (38); a plurality of uncondensed air holes (39) are opened on the upper semicircular plate (38); and a cooling chamber (312) is formed between the upper semicircular plate (38) and the lower semicircular plate (34).

3. The nitrogen heater box capable of eliminating thermal stress according to claim 2, characterized in that: The upper semicircular plate (38) is located on one side of the cooling chamber (312) and is integrally provided with an inclined plate (310); a heating chamber (313) is formed between the upper semicircular plate (38) and the sealing plate (31); a nitrogen heater tube box (32) is installed in the heating chamber (313); one end of the nitrogen heater tube box (32) passes through the sealing plate (31) and is in communication with the first chamber (15).

4. The nitrogen heater box capable of eliminating thermal stress according to claim 3, characterized in that: The top of the housing (20) is integrally provided with a hydrophobic inlet (21) and a steam inlet (22); wherein the hydrophobic inlet (21) is located at the top of the inclined plate (310) inside the cooling chamber (312); and the steam inlet (22) is located at the top of the heating chamber (313) between the upper semicircular plate (38) and the sealing plate (31).

5. The nitrogen heater box capable of eliminating thermal stress according to claim 4, characterized in that: The bottom of the housing (20) is also provided with a drain outlet (24); the drain outlet (24) is located at the bottom of the cooling cavity (312); and the housing (20) is fixedly mounted on the support (23).

6. The nitrogen heater box capable of eliminating thermal stress according to claim 4, characterized in that: A condensate discharge pipe (30) is fixedly installed through the bottom of the partition plate (36) between the upper semicircular plate (38) and the sealing plate (31); the condensate discharge pipe (30) passes through the side wall of the outer shell (20) and extends to the outside.

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