Nitrogen heater tube box capable of eliminating thermal stress

Abstract

The invention discloses a nitrogen heater tube box capable of eliminating thermal stress, and relates to the technical field of nitrogen heater tube boxes. The mounting head comprises a shell; one end of the shell is open, and a first connecting flange is integrally arranged at the open end of the shell; a partition plate is integrally arranged in the shell; the interior of the shell is divided into a first cavity and a second cavity through a partition plate. Wherein; the first chamber is in through connection with the outlet; the second chamber is in through connection with the inlet; a pressure sealing inlet hole is formed in the side wall, away from the open end, of the shell. The shell is fixedly mounted with the tube box through the first connecting flange; during use, the shell is fixedly installed through the first connecting flange and the second connecting flange on the outer shell, after installation is completed, the second cavity in the shell is communicated with the flow guide cavity through the through hole formed in the sealing plate, the inlet connected with the second cavity in a penetrating mode is connected with a conveying pipeline, and a medium enters the flow guide cavity through the second cavity.

Description

Technical Field

[0001] The invention specifically 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 air separation equipment, nitrogen heater is a critical component, and the performance of the pipe box is directly related to the operation effect and overall stability of the nitrogen heater. Nitrogen heater plays an indispensable role in air separation equipment, mainly using the heat released by steam to heat the polluted nitrogen gas, and then heating and activating the molecular sieve. Its performance directly determines whether the molecular sieve can work normally, and has a vital impact on the stable operation of the entire air separation equipment. As a key component of the nitrogen heater, the pipe box undertakes important tasks such as distributing and collecting tube fluids and connecting heat exchange tubes with external pipelines. Its performance directly affects the heat exchange efficiency and operation reliability of the nitrogen heater.

[0003] In the U-tube nitrogen heater, saturated steam usually enters the tube side and supercooled water flows out. The temperature difference between the two can sometimes reach more than 100°C. Such a large temperature difference will cause a large thermal stress on the splitter plate. This thermal stress will cause a series of serious problems, such as deformation of the tube box cylinder, which will cause the tube box seal to fail and cause steam leakage, which not only reduces the heat exchange efficiency of the nitrogen heater, but also may affect the normal operation of the entire air separation system and even cause safety accidents. At the same time, thermal stress may also cause cracks in the splitter plate, shorten the service life of the tube box, and increase equipment maintenance costs and downtime.

[0004] After searching, Chinese patent publication number CN201821197755.5 discloses a tube box structure of a dirty nitrogen heater; comprising a tube box shell and a tube sheet, wherein the tube box shell is provided with a first partition plate, a second partition plate, a third partition plate and a first partition plate in a transverse manner from top to bottom, and 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 processes;

[0005] In the above 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 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. In this way, 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 cold-deficient chamber through the uncondensed air holes opened on the upper semicircular plate. The uncondensed gas is cooled by water. At the same time, the water also acts on the partition, and the temperature is transmitted to the partition of the heating chamber section through the partition of the cold-deficient chamber section. The partition achieves a cooling effect on the nitrogen heater pipe box again, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box during operation, so as to solve 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 inside 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 hole is provided on the side wall of the shell away from the opening end; the shell is fixedly mounted to the pipe box through a first connecting flange;

[0010] As a further technical solution of the present invention, the pipe box comprises a shell; one end of the shell is integrally provided with a second connecting flange; the second connecting flange is detachably mounted on the first connecting flange;

[0011] As a further technical solution of the present invention, a nitrogen heater assembly is fixedly installed 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 arranged, one group is fixedly installed with the inner wall of the shell, and the other group is integrally arranged with the partition; wherein the guide plate integrally arranged with the partition is located in the middle of the guide plate fixedly installed with the inner wall of the shell;

[0012] 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 cold cavity is formed between the upper semicircular plate and the lower semicircular plate;

[0013] As a further technical solution of the present invention, the upper semicircular plate is located at one side of the cold cavity and is integrally provided with an inclined plate; a heating cavity is formed between the upper semicircular plate and the sealing plate; a nitrogen heater pipe box is installed in the heating cavity; one end of the nitrogen heater pipe box penetrates the sealing plate and is connected to the first cavity;

[0014] As a further technical solution of the present invention, one end of the nitrogen heater pipe box away from the sealing plate is fixedly installed with the U-shaped tube; the U-shaped tube is located on both sides of the partition, and one end of the U-shaped tube away from the nitrogen heater pipe box penetrates the lower semicircular plate and extends into the guide cavity;

[0015] As a further technical solution of the present invention, the top of the shell 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 cold cavity; and the steam inlet is located at the top of the heating cavity between the upper semicircular plate and the sealing plate;

[0016] As a further technical solution of the present invention, a drain outlet is also provided at the bottom of the shell; the drain outlet is located at the bottom of the cold cavity; the shell is fixedly mounted on the support;

[0017] 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.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. 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 with the guide chamber through the through hole opened on the sealing plate, and the inlet connected through the second chamber is connected with the conveying pipeline, so that the medium enters the guide chamber through the second chamber;

[0020] 2. In 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 are used to achieve the guide effect on the medium, and the upper and lower guide plates are used to transmit the medium to multiple 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 the transmission of the heated medium to the required position.

[0021] 3. In the present invention, when heating the nitrogen heater tube box, steam is transported into the heating chamber through the steam inlet provided on the shell, and the medium inside the nitrogen heater tube box is heated by the steam. At the same time, when the steam contacts the nitrogen heater tube box, condensation occurs on the top thereof, and the condensed steam flows downward through the outer wall of the nitrogen heater tube box, so as to achieve the cooling effect of steam water on the nitrogen heater tube box, and the condensed steam water is discharged through the condensate discharge pipe installed at the bottom of the partition;

[0022] 4. In the present invention, there is uncondensed steam in the heating chamber, and the uncondensed steam enters the cold-deficient chamber through the uncondensed air holes provided on the upper semicircular plate, and water is injected into the cold-deficient chamber through the drain inlet to achieve mixing of the uncondensed steam and water, and 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 cold-deficient chamber section, and the partition of the heating chamber section is cooled through the partition of the cold-deficient chamber section. The partition cools the nitrogen heater pipe box at the same time, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box and avoiding deformation of the nitrogen heater pipe box when used for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0024] Figure 2 The present invention Figure 1 Schematic diagram of the bottom structure.

[0025] Figure 3 The present invention Figure 1 Side view of.

[0026] Figure 4 The present invention Figure 3 Middle AA section view.

[0027] Figure 5 The present invention Figure 1 Schematic diagram of the splitting.

[0028] Figure 6 The present invention Figure 5 Schematic diagram of the bottom structure of the nitrogen heater assembly.

[0029] Figure 7 The present invention Figure 5 Schematic diagram of the internal structure of the mounting head.

[0030] 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 pipe, 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 cavity, 312-cold cavity, 313-heating cavity. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0032] 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;

[0033] Wherein; the first chamber 15 is connected to the outlet 11; the second chamber 16 is connected to the inlet 12; a pressure-sealed inlet hole 13 is provided on the side wall of the shell 10 away from the opening end; the shell 10 is fixedly mounted to the pipe box 2 through the first connecting flange 14;

[0034] The pipe box 2 comprises 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;

[0035] 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 with 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.

[0036] 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 arranged, 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;

[0037] 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; a cold lack cavity 312 is formed between the upper semicircular plate 38 and the lower semicircular plate 34;

[0038] 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 realize the guide effect on the medium, and the upper and lower guide plates 35 realize the transmission of the medium to the multiple U-shaped tubes 33, and one end of the U-shaped tube 33 away from the guide cavity 311 is fixedly connected to the nitrogen heater tube box 32, so that the medium is heated in the nitrogen heater tube box 32. After the medium is heated, it is transmitted to the first chamber 15, and the outlet 11 on the first chamber 15 is connected to the connecting pipe, so that the heated medium is transmitted to the required position;

[0039] Furthermore, the upper semicircular plate 38 is integrally provided with an inclined plate 310 on one side of the cold cavity 312; a heating cavity 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 cavity 313; one end of the nitrogen heater pipe box 32 penetrates the sealing plate 31 and is connected to the first cavity 15;

[0040] In this embodiment, one end of the nitrogen heater tube box 32 away from the sealing plate 31 is fixedly installed with the U-shaped tube 33; the U-shaped tube 33 is located on both sides of the partition 36, and one end of the U-shaped tube 33 away from the nitrogen heater tube box 32 penetrates the lower semicircular plate 34 and extends into the guide cavity 311;

[0041] By adopting the above technical solution, when heating the nitrogen heater tube 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 tube box 32 is heated by the steam. At the same time, when the steam contacts the nitrogen heater tube box 32, condensation occurs on the top thereof, and the condensed steam flows downward through the outer wall of the nitrogen heater tube box 32, so as to achieve the cooling effect of the steam water on the nitrogen heater tube box 32, and the condensed steam water is discharged through the condensate discharge pipe 30 installed at the bottom of the partition 36;

[0042] 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 cold cavity 312; and the steam inlet 22 is located at the top of the heating cavity 313 between the upper semicircular plate 38 and the sealing plate 31;

[0043] 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 cold cavity 312; the housing 20 is fixedly mounted on the support 23;

[0044] 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 penetrates the side wall of the housing 20 and extends to the outside;

[0045] By adopting the above technical solution, there is still uncondensed steam in the heating chamber 313. The uncondensed steam enters the cold-deficient chamber 312 through the uncondensed air holes 39 provided on the upper semicircular plate 38. Water is injected into the cold-deficient chamber 312 through the drain inlet 21 to achieve mixing of the uncondensed steam and water, and 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 cold-deficient chamber 312 section, and the partition 36 of the cold-deficient chamber 312 section is used to achieve a cooling effect on the partition 36 of the heating chamber 313 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 when used for a long time.

[0046] The working principle of the present invention is as follows: when in use, the housing 10 is fixedly installed through the first connecting flange 14 and the second connecting flange 25 on the housing 20. After the installation is completed, the second chamber 16 inside the housing 10 is connected to the guide chamber 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 chamber 311 through the second chamber 16;

[0047] After the medium enters the flow guiding cavity 311, the flow guiding effect of the medium is achieved through the flow guiding plate 35 at the bottom of the partition 36 and the flow guiding plate 35 on the inner wall of the shell 20, and the medium is transmitted to the multiple U-shaped tubes 33 through the upper and lower flow guiding plates 35. The end of the U-shaped tube 33 away from the flow guiding cavity 311 is fixedly connected to the nitrogen heater tube box 32 to achieve the heating of the medium in the nitrogen heater tube box 32. After the medium is heated, it is transmitted to the first chamber 15, and the outlet 11 on the first chamber 15 is connected to the connecting pipe to achieve the transmission of the heated medium to the required position.

[0048] When heating the nitrogen heater tube 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 tube box 32 is heated by the steam. At the same time, when the steam contacts the nitrogen heater tube box 32, condensation occurs on the top thereof, and the condensed steam flows downward through the outer wall of the nitrogen heater tube box 32, so as to achieve the cooling effect of the steam water on the nitrogen heater tube box 32, and the condensed steam water is discharged through the condensate discharge pipe 30 installed at the bottom of the partition 36;

[0049] There is still uncondensed steam in the heating chamber 313. The uncondensed steam enters the cold-deficient chamber 312 through the uncondensed air holes 39 provided on the upper semicircular plate 38. Water is injected into the cold-deficient chamber 312 through the drain inlet 21 to mix the uncondensed steam with water, and then the 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 cold-deficient chamber 312 section, and the partition 36 of the heating chamber 313 section is cooled by the partition 36 of the cold-deficient chamber 312 section. The partition 36 cools the nitrogen heater pipe box 32 at the same time, thereby effectively eliminating the thermal stress of the nitrogen heater pipe box 32 and avoiding deformation of the nitrogen heater pipe box 32 when used for a long time.

[0050] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A nitrogen heater tube box capable of eliminating thermal stress, characterized in that: The mounting head (1) comprises a housing (10); one end of the housing (10) is open, and 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); 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 shell (10) away from the opening end; and the shell (10) is fixedly mounted on the pipe box (2) via a first connecting flange (14).

2. The nitrogen heater tube box capable of eliminating thermal stress according to claim 1, characterized in that: The pipe box (2) comprises an outer shell (20); one end of the outer shell (20) is integrally provided with a second connecting flange (25); the second connecting flange (25) and the first connecting flange (14) are detachably mounted.

3. The nitrogen heater tube box capable of eliminating thermal stress according to claim 2, characterized in that: A nitrogen heater assembly (3) is fixedly installed inside the shell (20); the nitrogen heater assembly (3) comprises 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 the guide plates (35) are arranged, 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).

4. The nitrogen heater tube box capable of eliminating thermal stress according to claim 3, characterized in that: An upper semicircular plate (38) is integrally provided on the top of the partition (36); a plurality of uncondensed air holes (39) are provided on the upper semicircular plate (38); and a cold-deficient cavity (312) is formed between the upper semicircular plate (38) and the lower semicircular plate (34).

5. The nitrogen heater tube box capable of eliminating thermal stress according to claim 4, characterized in that: The upper semicircular plate (38) is located at one side of the cold-deficient cavity (312) and is integrally provided with an inclined plate (310); a heating cavity (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 cavity (313); one end of the nitrogen heater tube box (32) penetrates the sealing plate (31) and is in communication with the first cavity (15).

6. The nitrogen heater tube box capable of eliminating thermal stress according to claim 4, characterized in that: One end of the nitrogen heater tube box (32) away from the sealing plate (31) is fixedly mounted to the U-shaped tube (33); the U-shaped tube (33) is located on both sides of the partition (36); one end of the U-shaped tube (33) away from the nitrogen heater tube box (32) penetrates the lower semicircular plate (34) and extends into the guide cavity (311).

7. The nitrogen heater tube box capable of eliminating thermal stress according to claim 2, characterized in that: The top of the shell (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 cold cavity (312); and the steam inlet (22) is located at the top of the heating cavity (313) between the upper semicircular plate (38) and the sealing plate (31).

8. The nitrogen heater tube box capable of eliminating thermal stress according to claim 7, characterized in that: The bottom of the shell (20) is also provided with a drain outlet (24); the drain outlet (24) is located at the bottom of the cold cavity (312); the shell (20) is fixedly mounted on the support seat (23).

9. The nitrogen heater box capable of eliminating thermal stress according to claim 7, characterized in that: A condensate discharge pipe (30) is fixedly installed through the bottom of the partition (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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