阅读说明：本技术 用于悬浮床加氢装置的紧凑型复合管板蒸汽发生器 (Compact composite tube plate steam generator for suspension bed hydrogenation device ) 是由 曹占飞 王健 刘洋 杜美婷 于 2019-10-22 设计创作，主要内容包括：本发明为一种用于悬浮床加氢装置的紧凑型复合管板蒸汽发生器,包括管箱和换热蒸汽发生结构,管箱内设置第一管腔和第二管腔,第一管腔上连通设置反应产物入口,第二管腔上连通设置换热后产物出口；换热蒸汽发生结构包括壳体,壳体内设置反应产物通道和饱和水通道,反应产物通道的入口与第一管腔连通,反应产物通道的出口与第二管腔连通；管箱和壳体之间通过双管板结构隔离密封连接,双管板结构的内部设置允许外界空气流通的隔离腔,反应产物通道的两端均密封穿过双管板结构和隔离腔。该蒸汽发生器可以对高温高压工况下的反应产物进行余热回收,减少泄露发生的可能性；安全可靠,结构紧凑,压缩了双管板的材料费用,具有良好的经济性能。(The invention relates to a compact composite tube plate steam generator for a suspension bed hydrogenation device, which comprises a tube box and a heat exchange steam generation structure, wherein a first tube cavity and a second tube cavity are arranged in the tube box, the first tube cavity is communicated with a reaction product inlet, and the second tube cavity is communicated with a heat exchange product outlet; the heat exchange steam generation structure comprises a shell, wherein a reaction product channel and a saturated water channel are arranged in the shell, the inlet of the reaction product channel is communicated with the first tube cavity, and the outlet of the reaction product channel is communicated with the second tube cavity; the tube box and the shell are in isolation and sealing connection through a double-tube plate structure, an isolation cavity allowing outside air to circulate is arranged inside the double-tube plate structure, and two ends of the reaction product channel penetrate through the double-tube plate structure and the isolation cavity in a sealing mode. The steam generator can recover waste heat of reaction products under the high-temperature and high-pressure working condition, so that the possibility of leakage is reduced; the double-tube plate is safe and reliable, has a compact structure, reduces the material cost of the double-tube plate, and has good economic performance.)

1. A compact composite tube plate steam generator for a suspension bed hydrogenation device is characterized by comprising a tube box and a heat exchange steam generation structure, wherein a first tube cavity and a second tube cavity which are isolated from each other are arranged in the tube box; the heat exchange steam generation structure comprises a shell, wherein a reaction product channel and a saturated water channel are arranged in the shell, the inlet of the reaction product channel is communicated with the first tube cavity, and the outlet of the reaction product channel is communicated with the second tube cavity; the tube box and the shell are mutually isolated and hermetically connected through a double-tube plate structure, an isolation cavity allowing outside air to circulate is arranged inside the double-tube plate structure, and two ends of the reaction product channel hermetically penetrate through the double-tube plate structure and the isolation cavity.

2. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit as set forth in claim 1, wherein the double tube sheet structure comprises an outer tube sheet and an inner tube sheet with adjacent end faces abutting and being sealingly connected to each other, the isolation chamber is disposed in the middle of the adjacent end faces of the outer tube sheet and the inner tube sheet, the outer tube sheet is sealingly disposed at one end of the tube box, the inner tube sheet is sealingly disposed at one end of the shell, and both ends of the reaction product channel are sealingly disposed through the inner tube sheet, the isolation chamber and the outer tube sheet.

3. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit of claim 2 wherein the size of the isolation chamber along the axial direction of the tube box is 50mm or less.

4. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit as set forth in claim 3, wherein an outer boss is disposed at an end of the outer tube sheet away from the tube box, an inner groove is disposed at an end of the inner tube sheet close to the tube box, the outer boss is circumferentially and hermetically sleeved in the inner groove, an axial dimension of the outer boss is smaller than that of the inner groove, and the end surface of the outer boss and the groove bottom surface of the inner groove form the isolation chamber therebetween; the top of the side wall of the inner pipe plate is provided with a top vent hole communicated with the isolation cavity in a penetrating way, and the bottom of the side wall of the inner pipe plate is provided with a bottom vent hole communicated with the isolation cavity in a penetrating way.

5. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit of any of claims 2 to 4, wherein the heat exchange steam generation structure is a shell-and-tube heat exchange structure, the reaction product channel is a tube side, and the saturated water channel is a shell side; the bottom of the shell is provided with a saturated water inlet, and the top of the shell is provided with a steam outlet.

6. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit as set forth in claim 5 wherein said reaction product channel is provided as a U-shaped heat exchange tube having a U-shaped opening disposed toward said tube box; the inlet end of the U-shaped heat exchange tube penetrates through the double-tube plate structure in a sealing mode and is communicated with the first tube cavity, and the outlet end of the U-shaped heat exchange tube penetrates through the double-tube plate structure in a sealing mode and is communicated with the second tube cavity.

7. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit of claim 5, wherein the bottom of the shell is provided with a drain outlet.

8. The compact composite tube sheet steam generator for a suspended bed hydrogenation unit as set forth in claim 5 wherein a fixed support is provided at an end of the bottom of the shell near the tube box and a sliding support is provided at an end of the bottom of the shell away from the tube box.

9. The compact composite tube sheet steam generator for the suspended bed hydrogenation unit as claimed in any one of claims 2 to 4, wherein a partition plate is arranged in the tube box, and the partition plate seals and seals the inner cavity of the tube box to form the first tube cavity and the second tube cavity which are arranged up and down.

10. The compact, composite tube sheet steam generator for a suspended bed hydroprocessing unit of claim 9, wherein the top of the tube box is provided with the reaction product inlet and the bottom of the tube box is provided with the heat exchanged product outlet.

Technical Field

The invention relates to the technical field of heat exchange, in particular to a compact composite tube plate steam generator for a suspension bed hydrogenation device.

Background

In the suspension bed hydrogenation device, the outlet product of the fixed bed reactor has high pressure and temperature and harsh waste heat recovery operation conditions. If the process medium (oil gas) leaks into the saturated water, the phenomenon of carrying oil by steam is generated, the quality of the steam is seriously influenced, and even the explosion danger of downstream steam using equipment is caused. Therefore, in order to recover the waste heat of the outlet product and prevent leakage, the research on the novel steam generator is of great significance.

The composite tube plate structure used at present mainly comprises two forms of a connecting double tube plate and a separating double tube plate. The distance between the two tube plates is larger, and designers usually take the two tube plates as independent parts to respectively calculate the respective strength. The calculation method ensures that the design process of the double tube plates in the two forms is not different from that of the single tube plate, and is applied in actual engineering more. However, the two tube plates designed in this way are more expensive, especially under the design conditions of high temperature and high pressure.

In addition, since the temperature of the reaction product in the suspension bed hydrogenation apparatus is high, usually above 300 ℃, and the saturated water temperature is low, the temperature difference between the two sides of the conventional double tube plate is large, and the bending deformation of the tube plate is caused. When the tube plate deforms seriously, the welding seam of the tube head cracks, and process media leaks. The leakage not only causes abnormal shutdown of the device, but also causes excessive upgrading of materials due to unclear analysis of the leakage cause, thereby causing great direct economic loss and indirect economic loss. The direct cost increase of a steam generator with a diameter of 1500mm due to the improvement of materials is about 500 ten thousand, and the direct economic loss generated by the whole industry per year is at least billion.

How to compress the material cost of the double tube plate and reduce the possibility of leakage of the steam generator becomes a difficult problem which needs to be solved urgently in the industry. Therefore, the research on a novel tube plate structure has important economic value for reducing the project construction cost and improving the operation safety of the device.

Therefore, the inventor provides a compact composite tube plate steam generator for a suspension bed hydrogenation device by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.

Disclosure of Invention

The invention aims to provide a compact composite tube plate steam generator for a suspension bed hydrogenation device, which overcomes the problems of high material cost, high possibility of leakage of the steam generator and the like in the prior art, can recover waste heat of reaction products under severe working conditions of high temperature and high pressure, and reduces the possibility of leakage; on the premise of ensuring safety and reliability, the design structure is compact, the material cost of the double tube plates is reduced, and the double tube plates have good economic performance.

The compact composite tube plate steam generator for the suspension bed hydrogenation device comprises a tube box and a heat exchange steam generation structure, wherein a first tube cavity and a second tube cavity which are isolated from each other are arranged in the tube box, the first tube cavity is communicated with a reaction product inlet, and the second tube cavity is communicated with a product outlet after heat exchange; the heat exchange steam generation structure comprises a shell, wherein a reaction product channel and a saturated water channel are arranged in the shell, the inlet of the reaction product channel is communicated with the first tube cavity, and the outlet of the reaction product channel is communicated with the second tube cavity; the tube box and the shell are mutually isolated and hermetically connected through a double-tube plate structure, an isolation cavity allowing outside air to circulate is arranged inside the double-tube plate structure, and two ends of the reaction product channel hermetically penetrate through the double-tube plate structure and the isolation cavity.

In a preferred embodiment of the present invention, the double-tube plate structure includes an outer tube plate and an inner tube plate, wherein adjacent end faces of the outer tube plate and the inner tube plate are abutted against each other and are hermetically connected, the middle portion of the adjacent end faces of the outer tube plate and the inner tube plate is provided with the isolation cavity, the outer tube plate is hermetically disposed at one end of the tube box, the inner tube plate is hermetically disposed at one end of the shell, and two ends of the reaction product channel are hermetically penetrated through the inner tube plate, the isolation cavity and the outer tube plate.

In a preferred embodiment of the present invention, a dimension of the isolation chamber along the axial direction of the tube box is less than or equal to 50 mm.

In a preferred embodiment of the present invention, an outer boss is disposed at an end of the outer tube plate away from the tube box, an inner groove is disposed at an end of the inner tube plate close to the tube box, the outer boss is circumferentially and hermetically sleeved in the inner groove, an axial dimension of the outer boss is smaller than an axial dimension of the inner groove, and the isolation cavity is formed between an end surface of the outer boss and a groove bottom surface of the inner groove; the top of the side wall of the inner pipe plate is provided with a top vent hole communicated with the isolation cavity in a penetrating way, and the bottom of the side wall of the inner pipe plate is provided with a bottom vent hole communicated with the isolation cavity in a penetrating way.

In a preferred embodiment of the present invention, the heat exchange steam generation structure is a shell-and-tube heat exchange structure, the reaction product channel is a tube side, and the saturated water channel is a shell side; the bottom of the shell is provided with a saturated water inlet, and the top of the shell is provided with a steam outlet.

In a preferred embodiment of the present invention, the reaction product channel is a U-shaped heat exchange tube, and a U-shaped opening of the U-shaped heat exchange tube is disposed toward the tube box; the inlet end of the U-shaped heat exchange tube penetrates through the double-tube plate structure in a sealing mode and is communicated with the first tube cavity, and the outlet end of the U-shaped heat exchange tube penetrates through the double-tube plate structure in a sealing mode and is communicated with the second tube cavity.

In a preferred embodiment of the present invention, a drain outlet is disposed at the bottom of the housing.

In a preferred embodiment of the present invention, a fixed support is disposed at an end of the bottom of the housing close to the tube box, and a sliding support is disposed at an end of the bottom of the housing away from the tube box.

In a preferred embodiment of the present invention, a pass partition plate is disposed in the tube box, and the pass partition plate seals and seals an inner cavity of the tube box to form the first tube cavity and the second tube cavity which are vertically disposed.

In a preferred embodiment of the present invention, the top of the tube box is provided with the reaction product inlet, and the bottom of the tube box is provided with the heat exchange product outlet.

From the above, the compact composite tube plate steam generator for the suspension bed hydrogenation device provided by the invention has the following beneficial effects:

in the compact composite tube plate steam generator for the suspension bed hydrogenation device, the isolation cavity allows external air to circulate, so that natural convection is formed between gas in the isolation cavity and external air, the temperature difference stress and the bending deformation of the double tube plate structure can be reduced, the possibility of cracking of a tube head (a connecting part between a tube box and a heat exchange steam generation structure) is reduced, and under the condition that the quality of a reaction product channel and the quality of the double tube plate structure are not problematic, even if the defect occurs at the connecting part between the reaction product channel and any one side of the double tube plate structure to cause the leakage of related media, the related media can only enter the isolation cavity, the effective isolation of the two-phase media is realized, and the possibility of the leakage of the steam generator; the compact composite tube plate steam generator for the suspension bed hydrogenation device provided by the invention can be used for recovering waste heat of reaction products under severe working conditions of high temperature and high pressure, and the possibility of leakage is reduced. On the premise of ensuring safety and reliability, the design structure is compact, the material cost of the tube plate is reduced, and the tube plate has good economic performance.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1: is a schematic diagram of the compact composite tube sheet steam generator for a suspended bed hydrogenation unit of the present invention.

FIG. 2: is an enlarged view at I in FIG. 1.

In the figure:

100. a compact composite tube plate steam generator for the suspension bed hydrogenation device;

1. a pipe box;

11. a first lumen; 12. a second lumen; 13. a reaction product inlet; 14. a product outlet after heat exchange; 15. a split-range partition plate;

2. a heat exchange steam generating structure;

21. a housing; 22. a reaction product channel; 23. a saturated water channel; 24. a saturated water inlet; 25. a steam outlet; 26. a sewage draining outlet; 27. a fixed support; 28. a sliding support;

3. a double-pipe plate structure;

31. an outer tube sheet; 32. an inner tube sheet;

4. an isolation chamber;

41. a top vent; 42. a bottom vent.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

The specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present invention, without being stated to the contrary, practical terms of orientation such as "upper, lower, bottom, top" are generally defined under normal use of the compact composite tube sheet steam generator for a suspended bed hydrogenation unit provided by the present invention, and specifically refer to the orientation of the drawing shown in fig. 1. "inner and outer" refer to the inner and outer contours of the associated component. These orientations are used herein for the purpose of the present invention only and are not intended to be limiting. In addition, it should be noted that, the description is mainly given by using a steam generator for waste heat recovery in a suspension bed hydrogenation device, therefore, preferably, the steam generator provided by the present invention is a high-temperature high-pressure steam generator, and a heat source medium inlet described below of the steam generator is communicated with a high-temperature heat source, specifically, an outlet product pipeline of a fixed bed reactor, so as to realize safe recovery of high-temperature heat energy. It can be understood that the steam generator provided by the invention can also be applied to other various fields requiring waste heat recovery, in particular to the fields requiring harsh operating conditions at high temperature and high pressure, and various modifications of such application fields fall within the protection scope of the invention.

As shown in fig. 1 and fig. 2, the present invention provides a compact composite tube plate steam generator 100 for a suspension bed hydrogenation apparatus, which includes a tube box 1 and a heat exchange steam generation structure 2, wherein a first tube cavity 11 and a second tube cavity 12 which are isolated from each other are arranged in the tube box 1, the first tube cavity 11 is communicated with a reaction product inlet 13, and the second tube cavity 12 is communicated with a product outlet 14 after heat exchange; the heat exchange steam generation structure 2 comprises a shell 21, wherein a reaction product channel 22 and a saturated water channel 23 are arranged in the shell 21, the inlet of the reaction product channel 22 is communicated with the first tube cavity 11, and the outlet of the reaction product channel 22 is communicated with the second tube cavity 12; the tube box 1 and the shell 21 are mutually isolated and hermetically connected through a double-tube plate structure 3, an isolation cavity 4 allowing outside air to circulate is arranged in the double-tube plate structure 3, and both ends of the reaction product channel 22 hermetically penetrate through the double-tube plate structure 3 and the isolation cavity 4.

In the compact composite tube plate steam generator for the suspension bed hydrogenation device, the isolation cavity allows external air to circulate, so that natural convection is formed between gas in the isolation cavity and external air, the temperature difference stress and the bending deformation of the double tube plate structure can be reduced, the possibility of cracking of a tube head (a connecting part between a tube box and a heat exchange steam generation structure) is reduced, and under the condition that the quality of a reaction product channel and the quality of the double tube plate structure are not problematic, even if the defect occurs at the connecting part between the reaction product channel and any one side of the double tube plate structure to cause the leakage of related media, the related media can only enter the isolation cavity, the effective isolation of the two-phase media is realized, and the possibility of the leakage of the steam generator; the compact composite tube plate steam generator for the suspension bed hydrogenation device provided by the invention can be used for recovering waste heat of reaction products under severe working conditions of high temperature and high pressure, and the possibility of leakage is reduced. On the premise of ensuring safety and reliability, the design structure is compact, the material cost of the tube plate is reduced, and the tube plate has good economic performance.

Further, as shown in fig. 1 and 2, the integral double tube plate structure 3 is formed by dividing a fixed tube plate into two tube plates with different thicknesses, namely an outer tube plate 31 and an inner tube plate 32, on the basis of the fixed tube plate. The double-tube plate structure 3 comprises an outer tube plate 31 and an inner tube plate 32 which are abutted against each other and are in sealing connection with each other at the adjacent end faces, the middle parts of the adjacent end faces of the outer tube plate 31 and the inner tube plate 32 are provided with an isolation cavity 4, the outer tube plate 31 is arranged at one end of the tube box 1 in a sealing mode, the inner tube plate 32 is arranged at one end of the shell 21 in a sealing mode, and two ends of the reaction product channel 22 are arranged in a sealing mode in a penetrating mode through the inner tube plate 32, the isolation. In the compact composite tube plate steam generator for the suspension bed hydrogenation device, an inner tube plate and an outer tube plate are taken as a whole tube plate, namely a double tube plate structure 3, the two tube plates (an outer tube plate 31 and an inner tube plate 32) are mutually reinforced, the structure is compact, the outer tube plate 31 and the inner tube plate 32 bear the pressure load of a tube side and a shell side together, an analysis design method is adopted for calculation and thermal analysis, the sum of the thicknesses of the outer tube plate 31 and the inner tube plate 32 is not more than the thickness of a thicker single tube plate (the prior art) in a separated tube plate structure, especially for the tube plates under the high-pressure and high-temperature design working condition, the material cost is reduced, and the compact composite tube plate steam.

Further, the dimension of the isolation cavity 4 (the middle gap between the outer tube plate 31 and the inner tube plate 32) along the axial direction of the tube box is less than or equal to 50mm, the dimension is not too large, the stress is prevented from being influenced, and the connection part between the two tube plates (the outer tube plate 31 and the inner tube plate 32) is ensured to be mainly subjected to shearing force. The reaction product channel 22 (heat exchange tube) between the two tube plates (the outer tube plate 31 and the inner tube plate 32) is short in length and large in effective heat transfer area, so that the ineffective heat exchange of the reaction product channel 22 (heat exchange tube) in the isolation cavity 4 is reduced, and the overall heat exchange efficiency of the steam generator is improved.

In the case where the reaction product channel 22 and the double tube sheet structure 3 themselves have no problem in quality, even if a defect occurs at the joint between the reaction product channel 22 (heat exchange tube) and either one of the tube sheets (outer tube sheet 31 or inner tube sheet 32) to cause leakage of the relevant medium, only the separation chamber 4 between the two tube sheets (outer tube sheet 31 and inner tube sheet 32) is entered, and the two-phase medium is not entered into the tube box 1 through the joint between the outer tube sheet 31 and the reaction product channel 22 (heat exchange tube), achieving effective separation of the two-phase medium. The isolation chamber 4 can collect leaked media after leakage occurs in any tube plate (the outer tube plate 31 or the inner tube plate 32), and special treatment on the leaked media is realized. After the steam generator is used, the high-temperature heat energy of the product at the outlet of the fixed bed reactor in the suspension bed hydrogenation device can be safely recovered, and the catalyst and the adsorbent cannot be damaged due to the leakage of a steam generation medium.

For example, after water or steam leaks from the casing 21 due to a defective connection between the reaction product channel 22 (heat exchange tube) and the inner tube sheet 32, it can only enter the region between the two tube sheets (the insulating chamber 4) and cannot enter the tube box 1 through the connection between the outer tube sheet 31 and the reaction product channel 22 (heat exchange tube), so that the heat source medium in the tube box 1 is not contaminated, and safety and reliability are achieved.

For the outer tube plate 31, one side conducts forced convection heat transfer with a high-temperature and high-pressure heat source medium (a product at the outlet of a fixed bed reactor in a suspended bed hydrogenation device, the high temperature refers to the temperature of more than or equal to 350 ℃, and the high pressure refers to the pressure of more than or equal to 10MPa) in the tube box 1, and the other side conducts natural convection heat transfer with the air in the isolation cavity 4. Since the heat transfer coefficient of convection of the heat source medium in the tube box 1 is much larger than that of air, the temperature of the outer tube plate 31 is close to the same as that of the heat source medium. The operation temperature difference of the two sides of the outer pipe plate 31 is very small, and the deformation caused by the temperature difference is also very small, so that the cracking of the welding line caused by the bending deformation of the outer pipe plate 31 to the pipe hole on the outer pipe plate 31 (the outer pipe plate 31 is provided with a through hole penetrating through the reaction product channel 22 and used as a heat exchange pipe of the reaction product channel 22 for welding, sealing and fixing) can be avoided. Similarly, for the inner tube plate 32, one side is in convective heat transfer with the air in the isolation chamber 4, and the other side is in convective heat transfer with the saturated water in the housing 21. Because the convection heat transfer coefficient of the air is far smaller than that of the saturated water, the temperature of the inner tube plate 32 is close to the same as that of the saturated water, the temperature difference between the two sides of the inner tube plate 32 is small, and the deformation caused by the temperature difference stress is small during operation. Therefore, the gas in the isolation chamber 4 blocks the heat conduction between the high-temperature reaction product (tube-side heat source medium) in the tube box 1 and the saturated water (shell-side medium) in the shell 21, so that the temperatures of the two tube plates (the outer tube plate 31 or the inner tube plate 32) are respectively equal to the temperatures of the media contacted with the two tube plates, and the bending deformation of the single tube plate caused by the different temperatures at the two sides is avoided, thereby further causing the tube head to crack.

Further, as shown in fig. 1, an outer boss is arranged at one end of the outer pipe plate 31 far away from the pipe box 1, an inner groove is arranged at one end of the inner pipe plate 32 near the pipe box 1, the outer boss is circumferentially and hermetically sleeved in the inner groove, the axial size of the outer boss is smaller than that of the inner groove, and an isolation cavity 4 is formed between the end surface of the outer boss and the groove bottom surface of the inner groove; the top of the side wall of the inner tube plate 32 is provided with a top vent hole 41 communicated with the isolation cavity 4, and the bottom of the side wall of the inner tube plate is provided with a bottom vent hole 42 communicated with the isolation cavity.

The two vent holes (the top vent hole 41 and the bottom vent hole 42) are opened in opposite directions, so that natural convection is formed between the gas in the isolation cavity 4 and the outside air of the steam generator, the air in the isolation cavity 4 is kept to be smoothly convected, and meanwhile, the leakage of the medium can be found at the first time. The gas in the isolation chamber 4 blocks the heat conduction between the high-temperature reaction product (tube-side heat source medium) in the tube box 1 and the saturated water (shell-side medium) in the shell 21, so that the temperatures of the two tube plates are respectively equal to the temperatures of the media contacted with the two tube plates, the temperature difference stress is reduced, the bending deformation of the single tube plate due to different temperatures at the two sides is reduced, and the possibility of tube head cracking is reduced.

An elbow may be added to the top vent 41 to prevent external liquids or other contaminants from entering the isolation chamber 4. The bottom vents 42 may not be added with elbows to prevent airflow obstruction. Monitoring equipment can be arranged at the top vent hole 41 or the bottom vent hole 42, leaked media can be found in time, and the steam generator can be overhauled in time.

In an embodiment of the present invention, the outer tube plate 31 is formed by machining a disc-shaped forged piece, the outer tube plate 31 is hermetically disposed at one end of the tube box 1 and connected to the tube box 1 by butt welding, the outer tube plate 31 is connected to the tube box 1 by strength welding and local expansion, and the expansion length is determined by calculation according to the thickness of the outer tube plate 31 and heat transfer. The connecting weld of the outer tube plate 31 and the inner tube plate 32 is full penetration butt welding. Inner tube plate 32 is machined from a disc-shaped forging, inner tube plate 32 is sealingly disposed at one end of housing 21, and inner tube plate 32 and housing 21 may be connected by a flange or a butt weld. The inner tube plate 32 and the reaction product channel 22 (heat exchange tube) are connected by strength expansion, and the maximum design pressure of the shell side of the heat exchange steam generation structure 2 is related to the maximum pulling-out force suitable for the strength expansion and the aperture ratio of the inner tube plate 32.

Further, the heat exchange steam generation structure 2 is a shell-and-tube heat exchange structure, the reaction product channel 22 is a tube side, and the saturated water channel 23 is a shell side; the bottom of the housing 21 is provided with a saturated water inlet 24 and the top of the housing 21 is provided with a steam outlet 25. In a specific embodiment of the present invention, the saturated water inlet 24 and the steam outlet 25 are both provided in plurality at intervals. A steam generation space is provided in the housing 21, and saturated water enters from a saturated water inlet 24 at the bottom of the housing 21, exchanges heat with the heat source medium in the reaction product channel 22 to generate steam, and is discharged through a steam outlet 25 at the top of the housing 21.

In the present embodiment, the reaction product channel 22 is provided as a U-shaped heat exchange tube, the U-shaped opening of which is provided toward the tube box 1; the inlet end of the U-shaped heat exchange tube penetrates through the double-tube plate structure 3 in a sealing mode and is communicated with the first tube cavity 11, and the outlet end of the U-shaped heat exchange tube penetrates through the double-tube plate structure 3 in a sealing mode and is communicated with the second tube cavity 12, so that high-temperature reaction products (heat source media) in the tube box 1 flow through the U-shaped heat exchange tube. The U-shaped heat exchange tube is connected to the tube box 1 through the outer tube plate 31 and connected to the shell 21 through the inner tube plate 32, and the U-shaped heat exchange tube is welded and fixed with the outer tube plate 31 and the inner tube plate 32, so that the U-shaped heat exchange tube is fixed relative to the tube box 1 and the shell 21. In an embodiment of the present invention, a supporting frame is disposed in the casing 21, and the U-shaped heat exchange tube is erected on the supporting frame to ensure stable and reliable installation.

Further, as shown in fig. 1, a drain outlet 26 is provided at the bottom of the housing 21 to intermittently discharge shell-side impurities, thereby ensuring steam quality.

Further, as shown in fig. 1, a fixed support 27 is provided at an end of the bottom of the shell 21 close to the tube box 1, and a sliding support 28 is provided at an end of the bottom of the shell 21 away from the tube box 1, to reduce an influence on the double tube plate structure 3 (the outer tube plate 31 and the inner tube plate 32) due to a sliding displacement of the steam generator.

Further, as shown in fig. 1, a pass partition plate 15 is arranged in the tube box 1, and the pass partition plate 15 seals and separates an inner cavity of the tube box 1 into a first tube cavity 11 and a second tube cavity 12 which are arranged up and down, so that a high-temperature and high-pressure reaction product (a heat source medium which heats saturated water to generate high-temperature and high-pressure steam) flowing out of a fixed bed reactor in the suspension bed hydrogenation device and a product after heat exchange are separated. Because of the high pressure and high temperature of the tube side (reaction product channel 22), the end of the tube box is usually in a screw locking ring structure, and other high pressure sealing structures, such as a diaphragm sealing structure, can also be adopted.

Further, as shown in fig. 1, a reaction product inlet 13 is provided at the top of the tube box 1, and a heat-exchanged product outlet 14 is provided at the bottom of the tube box 1.

The compact composite tube plate steam generator 100 for the suspension bed hydrogenation device of the present invention has the following specific working process:

high-temperature and high-pressure reaction products flowing out of a fixed bed reactor in the suspension bed hydrogenation device enter a first tube cavity 11 through a reaction product inlet 13 on a tube box 1, the reaction products enter a U-shaped heat exchange tube through the inlet end of the U-shaped heat exchange tube, heat exchange is carried out between the reaction products and saturated water in a shell 21 of a heat exchange steam generation structure 2 to generate high-temperature and high-pressure steam, and the high-temperature and high-pressure steam is discharged out of the shell 21 through a steam outlet 25 at the top of the shell 21; after heat transfer is finished, the reaction product enters the second tube cavity 12 through the outlet end of the U-shaped heat exchange tube, and finally flows out of the tube box 1 through the product outlet 14 after heat exchange, so that the whole heat transfer process is finished.

From the above, the compact composite tube plate steam generator for the suspension bed hydrogenation device provided by the invention has the following beneficial effects:

in the compact composite tube plate steam generator for the suspension bed hydrogenation device, the isolation cavity allows external air to circulate, so that natural convection is formed between gas in the isolation cavity and external air, the temperature difference stress and the bending deformation of the double tube plate structure can be reduced, the possibility of cracking of a tube head (a connecting part between a tube box and a heat exchange steam generation structure) is reduced, and under the condition that the quality of a reaction product channel and the quality of the double tube plate structure are not problematic, even if the defect occurs at the connecting part between the reaction product channel and any one side of the double tube plate structure to cause the leakage of related media, the related media can only enter the isolation cavity, the effective isolation of the two-phase media is realized, and the possibility of the leakage of the steam generator; the compact composite tube plate steam generator for the suspension bed hydrogenation device provided by the invention can be used for recovering waste heat of reaction products under severe working conditions of high temperature and high pressure, and the possibility of leakage is reduced. On the premise of ensuring safety and reliability, the design structure is compact, the material cost of the tube plate is reduced, and the tube plate has good economic performance.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition. Any combination of the different embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the gist of the present invention.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.