CN112683088A - Heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion - Google Patents
Heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion Download PDFInfo
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- CN112683088A CN112683088A CN202110029189.7A CN202110029189A CN112683088A CN 112683088 A CN112683088 A CN 112683088A CN 202110029189 A CN202110029189 A CN 202110029189A CN 112683088 A CN112683088 A CN 112683088A
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Abstract
The invention discloses a heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion, which comprises a shell and a tube plate arranged in the shell, wherein the tube plate divides an inner cavity of the shell into a heat exchange cavity and a refrigerant cavity; the refrigerant cavity is divided into a liquid inlet cavity and a liquid outlet cavity; a heat insulation cylinder and a high-temperature inner header are arranged in the heat exchange cavity, and two ends of the U-shaped heat exchange tube are communicated with the liquid inlet cavity and the liquid outlet cavity through tube plates; a communicating part for communicating the inside and the outside of the heat insulation cylinder is arranged between the heat insulation cylinder and the tube plate; the high-temperature internal header is communicated with the heat insulation cylinder; a gas inlet pipe and a gas outlet pipe are arranged on the shell, the gas inlet pipe is over against the high-temperature internal header and is communicated with the high-temperature internal header, and the gas outlet pipe is over against the communicating part; a first heat insulation material is filled between the high-temperature inner header and the shell, an annular space between the heat insulation cylinder and the cylinder body forms a dead air area, and the dead air area is communicated with an inner cavity of the heat insulation cylinder through a communicating part. By the aid of the method and the device, manufacturing cost of equipment can be well reduced.
Description
Technical Field
The invention belongs to the technical field of chemical equipment, and particularly relates to a heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion.
Background
At present, the shell and tube heat exchanger is commonly adopted for recovering reaction heat generated by reaction of synthesis gas by adopting the heat exchanger, because the temperature of the synthesis gas is higher and contains high-concentration hydrogen, in order to ensure the safe operation of the heat exchanger, the equipment needs to be made of high-temperature-resistant and strong-hydrogen-corrosion-resistant materials, the manufacturing cost of the heat exchanger is higher, the maintenance cost of the equipment is also higher, and the purchase cost of the reaction heat recovery device is high.
Disclosure of Invention
Aiming at the problem that the manufacturing cost of the existing reaction heat recovery device is high, the application provides a heat exchange device resistant to high temperature, high pressure and hydrogen corrosion, which comprises a shell and a tube plate arranged in the shell, wherein the shell comprises a cylinder body, a first sealing flat cover and a second sealing flat cover, the first sealing flat cover and the second sealing flat cover are arranged at two ends of the cylinder body, the tube plate divides an inner cavity of the shell into a heat exchange cavity and a refrigerant cavity, the heat exchange cavity is positioned between the tube plate and the first flat cover, and the refrigerant cavity is positioned between the tube plate and the second flat cover;
a partition plate is arranged in the refrigerant cavity and divides the refrigerant cavity into a liquid inlet cavity and a liquid outlet cavity which are not communicated with each other; a heat transfer medium inlet communicated with the liquid inlet cavity and a heat transfer medium outlet communicated with the liquid outlet cavity are arranged on the shell; a heat insulation barrel and a high-temperature inner header are arranged in the heat exchange cavity, a U-shaped heat exchange tube is arranged in the heat insulation barrel, and two ends of the U-shaped heat exchange tube are respectively communicated with a liquid inlet cavity and a liquid outlet cavity through the tube plate; one end of the heat insulation cylinder facing the tube plate is an open end, and a communicating part for communicating the inside and the outside of the heat insulation cylinder is arranged between the open end and the tube plate;
the high-temperature internal header is positioned on one side of the heat insulation cylinder, which is far away from the tube plate, and the high-temperature internal header is communicated with the heat insulation cylinder; a gas inlet pipe and a gas outlet pipe are arranged on the shell, the gas inlet pipe is over against the high-temperature internal header and is communicated with the high-temperature internal header, and the gas outlet pipe is over against the communicating part;
a first heat insulation material is filled between the high-temperature inner header and the shell, an annular space between the heat insulation cylinder and the cylinder body forms a dead air area, and the dead air area is communicated with an inner cavity of the heat insulation cylinder through a communicating part. The distance between the heat insulation cylinder and the shell is 50-100 mm.
The gas inlet pipe is opposite to the high-temperature internal header, and means that the gas inlet pipe is positioned in the area of the cylinder corresponding to the high-temperature internal header in the radial direction. The gas outlet pipe is opposite to the communicating part, and the gas outlet pipe is positioned in the area of the cylinder corresponding to the communicating part in the radial direction.
For convenience of manufacture, installation and maintenance, the dividing plate is provided with a bending part extending along the radial direction, a manhole is arranged on the bending part, a blind plate is arranged on the manhole, and components enclosed in the dividing plate can be conveniently installed and maintained through the manhole.
The heat exchanger is mainly applied to an ammonia synthesis process and used for recovering reaction heat of synthesis gas in the ammonia synthesis process, when the heat exchanger works, the synthesis gas can enter an annular gap between the heat insulation cylinder and the cylinder body through the communicating part, because one end of the annular gap facing the first flat cover is a closed end, the synthesis gas entering the annular gap is basically in a non-flowing static state, the annular gap between the heat insulation cylinder and the cylinder body is called as a dead gas area, because the gas is a hot poor conductor, the heat insulation effect can be achieved, meanwhile, the whole heat insulation cylinder can be located in the enclosure of the synthesis gas, the compressive strength of the heat insulation cylinder can be reduced, the wall thickness of the heat insulation cylinder is reduced, and the manufacturing cost of equipment is reduced.
In the application, the gas outlet pipe is opposite to the communicating part, so that the synthetic gas is directly discharged out of the heat exchange device through the gas outlet pipe after flowing out of the heat insulation cylinder, and most of the area of the shell is not directly contacted with the synthetic gas with higher temperature any more, so that the area which is not directly contacted with the high-temperature synthetic gas can be prepared by adopting materials with lower grade, and the manufacturing cost of equipment is reduced. The arrangement of the first heat preservation layer can effectively reduce the outward heat transfer of the synthesis gas when the synthesis gas passes through the high-temperature internal header, and the excessive rise of the temperature of part of shells around the high-temperature internal header is avoided.
Meanwhile, because the synthesis gas in the dead gas area is basically in a static state, the temperature is reduced to a certain degree, and the pressure of the shell can be effectively reduced. By using the method, most of the area of the shell can be lower than 400 ℃, so that the shell can be made of common materials, and the manufacturing cost of equipment is reduced.
Furthermore, in order to ensure that the synthesis gas is uniformly distributed in the heat insulation cylinder, a gas uniform distributor is arranged between the high-temperature internal header and the heat insulation cylinder. Preferably, the gas distributor is a ball head conical plate with a center part protruding towards the direction of the high-temperature inner header, and the radial outer end part of the ball head conical plate is provided with a gas hole. After the ball head conical plate is adopted to manufacture the gas uniform distributor, and after the radial outer end part of the ball head conical plate is provided with the gas hole, the radial outer end part of the ball head conical plate is obliquely arranged, synthetic gas can move to the central area of the heat insulation cylinder under the action of inertia after entering the heat insulation cylinder through the gas hole, and the synthetic gas is uniformly distributed in the heat insulation cylinder due to the blocking effect of the U-shaped heat exchange tube.
Further, a first sealing diaphragm gasket is arranged between the first flat cover and the cylinder in a gasket mode, the first flat cover and the heat exchange cavity are completely isolated by the first sealing diaphragm gasket, and a first sealing surface formed by Inconel600 material overlaying welding is arranged on the end face, facing the first flat cover, of the cylinder;
and a second sealing diaphragm pad is arranged between the second flat cover and the cylinder in a cushioning manner, the second flat cover and the refrigerant cavity are completely isolated by the second sealing diaphragm pad, and a second sealing surface formed by Inconel600 material overlaying welding is arranged on the end surface of the cylinder facing the second flat cover.
The material of the first sealing diaphragm pad and the second sealing diaphragm pad is preferably 321SS stainless steel. The material of the first flat cover is preferably 1Cr5Mo alloy steel, and the material of the second flat cover is preferably 20MnMo alloy steel.
After the first sealing diaphragm and the second sealing diaphragm pad are arranged, the direct contact between the first flat cover and the second flat cover and the synthesis gas can be avoided, the hydrogen corrosion resistance requirement of the first flat cover and the second flat cover is reduced, only the temperature resistance of the first flat cover and the second flat cover is considered, and therefore the manufacturing cost of the first flat cover and the second flat cover is lowered, the first sealing diaphragm pad and the second sealing diaphragm pad can be manufactured by adopting a material with better corrosion resistance, and the first sealing diaphragm pad and the second sealing diaphragm pad can be conveniently replaced.
Further, to improve the heat insulating performance. The outer peripheral surface of the heat insulation cylinder is wrapped with a heat insulation layer, and an annular space between the heat insulation layer and the cylinder body forms the dead air area.
Further, be provided with the build-up welding closed layer on the first terminal surface of tube sheet orientation first flat cover, the first terminal surface that this build-up welding closed layer full cloth tube sheet is located the region of heat transfer intracavity, and this build-up welding closed layer extends towards first flat cover direction by this first terminal surface along the inner surface of barrel, until surpassing the terminal surface of heat preservation orientation second flat cover. The thickness of the surfacing sealing layer is preferably 3.5-4.5 mm.
The surfacing layer in this application only sets up in the high temperature region with synthetic gas direct contact, adopts the surfacing layer, can adopt high temperature resistant material to make the part in this region, and need not to adopt the material that hydrogen corrosion resistance corrodes to reduce the anticorrosive grade of material, with the cost of manufacture of reduction equipment. Because the surfacing layer seals the welding seam of the corresponding area, a welding seam-free area is formed, and hydrogen corrosion of the area possibly caused by high-concentration hydrogen in the synthesis gas at high temperature is avoided. The dead gas area is arranged, so that the temperature of the cylinder area opposite to the dead gas area can be reduced, the temperature of the cylinder area is lower than 400 ℃, and a surfacing layer is not required for protection. The U-shaped heat exchange tube penetrates through the surfacing layer and is inserted into the tube plate, so that a welding seam between the U-shaped heat exchange tube and the tube plate is positioned in a heat transfer medium, the welding seam between the U-shaped heat exchange tube and the tube plate is prevented from being exposed in synthesis gas, and the protection of a tube head of the U-shaped heat exchange tube is facilitated.
Further, in order to ensure that the high-temperature area can have the hydrogen corrosion resistance, the surfacing sealing layer at least exceeds 100mm of the end face of the heat insulation layer facing the second flat cover.
Further, a build-up seal layer covers the communicating portion as viewed in the radial direction, and the build-up seal layer extends to and fills the inner wall of the gas outlet pipe. The design can provide maximum protection for the area in contact with the synthesis gas.
Further, in order to avoid that the thermal insulation cylinder cannot freely stretch out and draw back at high temperature to cause internal stress concentration, the end of the thermal insulation cylinder facing the tube plate is a free end, a supporting leg is installed on the free end, and the supporting leg is slidably supported on the surfacing closed layer. The landing legs are provided with a plurality of landing legs, and synthesis gas can enter a dead gas area from the holes between the landing legs and the gaps between the landing legs and the overlaying sealing layer. After the free end is arranged, the heat insulation cylinder can freely stretch out and draw back along with the change of temperature, so that the phenomenon that the normal operation of equipment is influenced due to deformation and cracking caused by the generation of internal stress is avoided.
Specifically, the cylinder body sequentially comprises a high-temperature cavity, a main cavity and a tube pass cavity along the direction from a first flat cover to a second flat cover, wherein the high-temperature cavity and the main cavity are welded together, and two ends of a tube plate are respectively welded on the main cavity and the tube pass cavity; the gas inlet pipe is arranged on the high-temperature cavity, the gas outlet pipe is arranged at one end of the main cavity, which faces the tube plate, and the heat transfer medium inlet and the heat transfer medium outlet are arranged on the tube pass cavity;
the high-temperature cavity, the main cavity and the tube plate are all made of 12Cr2Mo1 alloy steel, and the tube pass cavity is made of 15CrMo alloy steel.
After the barrel is divided into multiple sections, different thickness and material requirements can be set according to different temperature areas where the high-temperature cavity, the main cavity and the tube pass cavity are located, and the difficulty of machining caused by the adoption of a single barrel is avoided.
Further, when the heat exchange device works, the synthesis gas enters the high-temperature inner header through the gas inlet pipe, then enters the heat insulation cylinder, exchanges heat with the heat transfer medium in the U-shaped heat exchange pipe, and the synthesis gas after heat exchange is discharged through the gas outlet pipe; the heat transfer medium enters the U-shaped heat exchange tube through the heat transfer medium inlet and the liquid inlet cavity in sequence, exchanges heat with the synthesis gas, and is discharged through the liquid outlet cavity and the heat transfer medium outlet in sequence;
the inlet temperature of the synthesis gas is 435-450 ℃, and the outlet temperature of the synthesis gas is 405-420 ℃; the temperature of the region of the cylinder opposite the dead gas zone in the radial direction is less than 400 ℃. The heat transfer medium is non-corrosive medium such as steam, water or heat transfer oil.
When steam is used as a heat transfer medium, the steam is saturated steam with the temperature of 250-260 ℃, and the saturated steam becomes superheated steam with the temperature of 395-405 ℃ after heat exchange.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is an enlarged view of a portion B in fig. 1.
Fig. 4 is an enlarged view of a portion C in fig. 1.
Detailed Description
Referring to fig. 1, a heat exchange device for resisting high temperature, high pressure and hydrogen corrosion includes a housing, a tube plate 11 disposed in the housing, the housing includes a cylinder 60, a first sealing flat cover 24 and a second sealing flat cover 14 disposed at two ends of the cylinder, the tube plate 11 divides an inner cavity of the housing into a heat exchange cavity 21 and a refrigerant cavity 22, wherein the heat exchange cavity is located between the tube plate 11 and the first flat cover 24, and the refrigerant cavity is located between the tube plate 11 and the second flat cover 14. The housing is horizontal, and the first flat cover 24 is mounted to the cylinder via the first bolt 17, and the second flat cover 14 is mounted to the cylinder via the second bolt 27.
Referring to fig. 3, a first sealing diaphragm pad 28 is installed between the first flat cover 24 and the cylinder 60, the first sealing diaphragm pad 28 completely isolates the first flat cover 24 from the heat exchange cavity 21, and a first sealing surface 41 formed by Inconel600 material overlaying is disposed on an end surface of the cylinder 60 facing the first flat cover 24. In the drawings, the first sealing surface 41 is a black square.
Referring to fig. 4, a second sealing diaphragm pad 18 is installed between the second flat cover 14 and the cylinder 60, the second sealing diaphragm pad 18 completely isolates the second flat cover 14 from the refrigerant cavity 22, and a second sealing surface 13 formed by Inconel600 material overlaying is disposed on an end surface of the cylinder 60 facing the second flat cover 14. In the drawing, the second sealing surface 13 is a black square.
The materials of the first sealing diaphragm pad and the second sealing diaphragm pad are 321SS stainless steel. The first flat cover 24 is made of 1Cr5Mo alloy steel material, and the second flat cover 14 is made of 20MnMo alloy steel material.
A partition plate 19 is arranged in the refrigerant cavity and divides the refrigerant cavity into a liquid inlet cavity 221 and a liquid outlet cavity 222 which are not communicated with each other; the shell is provided with a heat transfer medium inlet 15 communicated with the liquid inlet cavity 221 and a heat transfer medium outlet 12 communicated with the liquid outlet cavity 222. The dividing plate 19 is a folding plate, one side of the folding plate is welded on the tube plate 11, the other side of the folding plate is welded on the cylinder body 60, a liquid outlet cavity 222 is formed in the space surrounded by the dividing plate 19 and the cylinder body 60, and the folding plate is not in contact with the second flat cover 14 so as to facilitate the installation of the second flat cover 14.
The dividing plate 19 has a bent portion 191 extending in the radial direction of the cylinder 60, a manhole 192 is provided at the bent portion 191, maintenance of the connection of the below-described U-shaped heat exchange pipe 81 to the pipe plate can be performed through the manhole 192, and a blind plate 193 is installed at the manhole 192.
A heat insulation cylinder 9 and a high-temperature inner header 16 are arranged in the heat exchange cavity, a baffle rod assembly 10 and a U-shaped heat exchange tube bundle 8 consisting of a plurality of U-shaped heat exchange tubes 81 are arranged in the heat insulation cylinder 9, and the U-shaped heat exchange tubes 81 are movably supported on baffle rods 33 in the baffle rod assembly 10.
The end of the heat shield cylinder 9 facing the tube plate 11 is a free end, on the end of which a leg 92 is mounted.
A gas distributor 7 is arranged between the high-temperature inner header 16 and the heat insulation barrel 9, the gas distributor is a ball head conical plate with the center part protruding towards the direction of the high-temperature inner header, the radial outer end part of the ball head conical plate is provided with a gas hole, and the gas hole is communicated with the high-temperature inner header 16 and the heat insulation barrel 9. In the drawings, the air holes are not shown, and only the center lines 71 of the air holes are shown.
Two ends of each U-shaped heat exchange tube 81 are respectively welded on the tube plate 11, and two ends of each U-shaped heat exchange tube are respectively communicated with the liquid inlet cavity 221 and the liquid outlet cavity 222; the end of the heat insulating cylinder 9 facing the tube plate 11 is an open end, and a communication portion 91 for communicating the inside and the outside of the heat insulating cylinder is provided between the open end and the tube plate.
The high-temperature internal header 16 is positioned on one side of the heat insulation barrel 9, which is far away from the tube plate 11, and is communicated with the heat insulation barrel; a gas inlet pipe 31 facing and communicating with the high temperature inner header and a gas outlet pipe 5 facing the communicating portion are provided on the housing. The extension pipe 100 of the inner part of the synthesis column is connected via a first flange 101 to a second flange 311 on the gas inlet pipe 31, between which an omega seal ring 102 is placed.
A first heat insulating material 211 is filled between the high temperature inner header 16 and the outer shell. In this embodiment, the first heat-insulating material is made of an aluminum silicate fiber felt.
In this embodiment, this thermal-insulated section of thick bamboo and barrel are coaxial setting, and the distance between thermal-insulated section of thick bamboo and the shell is 80mm, and the external diameter of thermal-insulated section of thick bamboo is 160mm with the internal diameter difference of barrel promptly, has wrapped up 40mm thick heat preservation 93 on the outer peripheral face of thermal-insulated section of thick bamboo, and the annular space between this heat preservation 93 and the barrel forms dead air district 35. It will be appreciated that when there is no insulation layer 93, then the annular space between the insulated drum and the canister is formed as a dead air zone 35.
Referring to fig. 2, a build-up welding sealing layer 70 is disposed on a first end surface 111 of the tube plate 11 facing the first flat cover 24, the build-up welding sealing layer 70 covers a region where the first end surface of the tube plate is located in the heat exchange cavity 21, and the build-up welding sealing layer 70 extends from the first end surface along the inner surface of the cylinder 60 toward the first flat cover 24 until the end surface extends beyond the insulating layer 93 and faces the second flat cover 14. The surfacing sealing layer 70 exceeds the end face of the heat-insulating layer facing the second flat cover, continues to extend towards the first flat cover 24, and exceeds the end face of the heat-insulating layer facing the second flat cover, and the length M of the surfacing sealing layer exceeding the end face of the heat-insulating layer facing the second flat cover is 100 mm.
The weld-on closure layer 70 covers the communication portion as viewed in the radial direction, and the weld-on closure layer 70 extends to and over the inner wall 51 of the gas outlet pipe 5 and then along the outer end face 52 thereof.
The legs 92 on the insulating cylinder 9 are slidably supported on the weld overlay seal 70. The dead gas zone 35 communicates with the inner cavity of the heat insulating cylinder through the gap between adjacent legs and the communicating portion 91. Since the legs are slidably supported on the weld overlay 70, there is also a gap between the legs and the weld overlay 70, and gas can also pass through the gap between the legs and the weld overlay 70 into the dead gas zone.
In this embodiment, the thickness of the overlay welding sealing layer 70 is 4.0mm, and it is understood that in other embodiments, the thickness of the overlay welding sealing layer may also be 3.5mm, 3.7mm, 3.9mm, 4.1mm, 4.3mm, or 4.5mm, and may also be other thicknesses between 3.5mm and 4.5 mm.
In this embodiment, the cylinder 60 sequentially includes a high temperature cavity 4, a main cavity 6 and a tube pass cavity 1 along a direction from the first flat cover 24 to the second flat cover 14, wherein the high temperature cavity 4 and the main cavity 6 are welded together, and two ends of the tube plate 11 are respectively welded on the main cavity 6 and the tube pass cavity 1.
A shower guide pipe 23 is arranged at the lower side of the high-temperature cavity 4, and a movable support 25 is arranged at the lower side of the cylinder body.
The gas inlet pipe 31 is arranged on the high-temperature cavity 4, the gas outlet pipe is arranged at one end of the main cavity 6 facing the tube plate 11, and the heat transfer medium inlet 15 and the heat transfer medium outlet 12 are arranged on the tube side cavity 1. The heat transfer medium inlet 15 is located on the lower side of the tube-side chamber 1, and the heat transfer medium outlet 12 is located on the upper side of the tube-side chamber 1.
The high-temperature cavity, the main cavity and the tube plate are all made of 12Cr2Mo1 alloy steel, and the tube pass cavity is made of 15CrMo alloy steel.
When the heat exchange device works, the synthesis gas enters the high-temperature internal header 16 through the gas inlet pipe 100, then enters the heat insulation cylinder 9 to exchange heat with the heat transfer medium in the U-shaped heat exchange pipe, and the synthesis gas after heat exchange is discharged through the gas outlet pipe 5. The heat transfer medium enters the U-shaped heat exchange tube through the heat transfer medium inlet 15 and the liquid inlet cavity 221, exchanges heat with the synthesis gas, and is discharged through the liquid outlet cavity 222 and the heat transfer medium outlet 12 in sequence.
The inlet temperature of the synthesis gas is 440 +/-5 ℃, and the outlet temperature of the synthesis gas is 405-410 ℃; the temperature of the region of the cylinder opposite the dead gas zone in the radial direction was 395-398 ℃.
In this embodiment, the heat transfer medium is saturated steam, the inlet temperature of the saturated steam at the heat transfer medium inlet 15 is 250-.
It will be appreciated that in other embodiments, the heat transfer medium may also be water or a thermally conductive oil.
Claims (10)
1. A heat exchange device resisting high temperature, high pressure and hydrogen corrosion is characterized by comprising a shell and a tube plate arranged in the shell, wherein the shell comprises a cylinder body, a first sealing flat cover and a second sealing flat cover which are arranged at two ends of the cylinder body, the tube plate divides an inner cavity of the shell into a heat exchange cavity and a refrigerant cavity, the heat exchange cavity is positioned between the tube plate and the first flat cover, and the refrigerant cavity is positioned between the tube plate and the second flat cover;
a partition plate is arranged in the refrigerant cavity and divides the refrigerant cavity into a liquid inlet cavity and a liquid outlet cavity which are not communicated with each other; a heat transfer medium inlet communicated with the liquid inlet cavity and a heat transfer medium outlet communicated with the liquid outlet cavity are arranged on the shell;
a heat insulation barrel and a high-temperature inner header are arranged in the heat exchange cavity, a U-shaped heat exchange tube is arranged in the heat insulation barrel, and two ends of the U-shaped heat exchange tube are respectively communicated with a liquid inlet cavity and a liquid outlet cavity through the tube plate; one end of the heat insulation cylinder facing the tube plate is an open end, and a communicating part for communicating the inside and the outside of the heat insulation cylinder is arranged between the open end and the tube plate;
the high-temperature internal header is positioned on one side of the heat insulation cylinder, which is far away from the tube plate, and the high-temperature internal header is communicated with the heat insulation cylinder; a gas inlet pipe and a gas outlet pipe are arranged on the shell, the gas inlet pipe is over against the high-temperature internal header and is communicated with the high-temperature internal header, and the gas outlet pipe is over against the communicating part;
a first heat insulation material is filled between the high-temperature inner header and the shell, an annular space between the heat insulation cylinder and the cylinder body forms a dead air area, and the dead air area is communicated with an inner cavity of the heat insulation cylinder through a communicating part.
2. The heat exchange apparatus as claimed in claim 1, wherein a gas distributor is provided between the high temperature header and the heat insulating cylinder.
3. Heat exchange device according to claim 1,
a first sealing diaphragm gasket is arranged between the first flat cover and the cylinder in a cushioning manner, the first flat cover and the heat exchange cavity are completely isolated by the first sealing diaphragm gasket, and a first sealing surface formed by the Inconel600 material in a surfacing manner is arranged on the end surface of the cylinder facing the first flat cover;
and a second sealing diaphragm pad is arranged between the second flat cover and the cylinder in a cushioning manner, the second flat cover and the refrigerant cavity are completely isolated by the second sealing diaphragm pad, and a second sealing surface formed by Inconel600 material overlaying welding is arranged on the end surface of the cylinder facing the second flat cover.
4. Heat exchange device according to claim 1,
the outer peripheral surface of the heat insulation cylinder is wrapped with a heat insulation layer, and an annular space between the heat insulation layer and the cylinder body forms the dead air area.
5. The heat exchange device of claim 4,
and a surfacing sealing layer is arranged on the first end face of the tube plate facing the first flat cover, the first end face of the tube plate is fully covered with the surfacing sealing layer, and the surfacing sealing layer extends from the first end face to the first flat cover along the inner surface of the cylinder until the surfacing sealing layer exceeds the end face of the heat insulation layer facing the second flat cover.
6. The heat exchange device of claim 5,
the surfacing sealing layer at least exceeds 100mm of the end face of the insulating layer facing the second flat cover.
7. The heat exchange device of claim 5,
the build-up welding seal layer covers the communicating portion as viewed in the radial direction, and extends to and fills the inner wall of the gas outlet pipe.
8. A unit according to claim 5 in which the end of the cartridge facing the tube sheet is a free end on which are mounted legs which are slidably supported on the weld overlay closure.
9. Heat exchange device according to any of claim 1,
the cylinder body sequentially comprises a high-temperature cavity, a main cavity and a tube pass cavity along the direction from the first flat cover to the second flat cover, wherein the high-temperature cavity and the main cavity are welded together, and two ends of a tube plate are respectively welded on the main cavity and the tube pass cavity;
the gas inlet pipe is arranged on the high-temperature cavity, the gas outlet pipe is arranged at one end of the main cavity, which faces the tube plate, and the heat transfer medium inlet and the heat transfer medium outlet are arranged on the tube pass cavity;
the high-temperature cavity, the main cavity and the tube plate are all made of 12Cr2Mo1 alloy steel, and the tube pass cavity is made of 15CrMo alloy steel.
10. The heat exchange device according to any one of claims 1 to 9, wherein when the heat exchange device is in operation, the synthesis gas enters the high-temperature inner header through the gas inlet pipe, then enters the heat insulation cylinder to exchange heat with the heat transfer medium in the U-shaped heat exchange pipe, and the synthesis gas after heat exchange is discharged through the gas outlet pipe; the heat transfer medium enters the U-shaped heat exchange tube through the heat transfer medium inlet and the liquid inlet cavity in sequence, exchanges heat with the synthesis gas, and is discharged through the liquid outlet cavity and the heat transfer medium outlet in sequence;
the inlet temperature of the synthesis gas is 435-450 ℃, and the outlet temperature of the synthesis gas is 405-420 ℃; the temperature of the region of the cylinder opposite the dead gas zone in the radial direction is less than 400 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110029189.7A CN112683088A (en) | 2021-01-11 | 2021-01-11 | Heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110029189.7A CN112683088A (en) | 2021-01-11 | 2021-01-11 | Heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion |
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| Publication Number | Publication Date |
|---|---|
| CN112683088A true CN112683088A (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110029189.7A Pending CN112683088A (en) | 2021-01-11 | 2021-01-11 | Heat exchange device capable of resisting high temperature, high pressure and hydrogen corrosion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405376A (en) * | 2021-07-05 | 2021-09-17 | 南京聚拓化工科技有限公司 | Full-counterflow heat recovery device |
| CN113418409A (en) * | 2021-07-05 | 2021-09-21 | 南京聚拓化工科技有限公司 | Full-countercurrent double-sleeve type heat recovery device |
-
2021
- 2021-01-11 CN CN202110029189.7A patent/CN112683088A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405376A (en) * | 2021-07-05 | 2021-09-17 | 南京聚拓化工科技有限公司 | Full-counterflow heat recovery device |
| CN113418409A (en) * | 2021-07-05 | 2021-09-21 | 南京聚拓化工科技有限公司 | Full-countercurrent double-sleeve type heat recovery device |
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