Reboiler of aniline recovery tower

Abstract

The utility model discloses an aniline recovery tower reboiler, which relates to the technical field of chemical equipment, and comprises a barrel, an upper seal head, a lower seal head, a circulating liquid inlet, a first anti-scour baffle plate, a second anti-scour baffle plate, a first tube plate, a second tube plate, a plurality of baffle plates, a plurality of heat exchange tubes and at least four solid pull rods, the first anti-scour baffle is arranged close to the steam inlet, and the second anti-scour baffle is arranged close to the circulating liquid inlet; one end of each heat exchange tube penetrates through the first tube plate and is communicated with the interior of the upper sealing head, the other end of each heat exchange tube penetrates through the second tube plate and is communicated with the interior of the lower sealing head, the multiple baffle plates are transversely and alternately arranged in the barrel, and the top ends of the solid pull rods are connected with the baffle plates, close to the first tube plate, in the barrel. The bottom ends of the solid pull rods are connected with the second tube plate, and the solid pull rods penetrate through all the baffle plates on the path. Through the arrangement of the cross baffle plates, the solid pull rods for fixing and the impingement baffle, the defects of traditional equipment can be effectively overcome.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to a reboiler for an aniline recovery tower. Background Technology

[0002] Aniline is an important chemical raw material, widely used in dyes, pharmaceuticals, rubber additives and other fields. In the process of aniline production or the treatment of aniline-containing waste liquid, aniline is often recovered through distillation towers. The reboiler, as one of the core equipment of the distillation tower, is responsible for providing continuous heat to the tower to maintain the vaporization of the material.

[0003] Traditional aniline recovery tower reboilers mostly adopt a shell-and-tube structure, but in actual operation, the following problems exist: Insufficient heat transfer efficiency: The flow paths of steam and circulating liquid are simple, and the steam in the shell side is prone to laminar flow, resulting in low heat exchange efficiency and high energy consumption; Poor structural stability: The baffles are prone to displacement due to lack of fixed support, affecting the flow field distribution; High-speed fluids at the steam inlet and circulating liquid inlet directly impact the tube bundle, causing vibration and wear. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an aniline recovery tower reboiler, which effectively solves the defects of traditional equipment through the setting of cross baffles, solid tie rod fixing, and anti-impact baffles.

[0005] This application provides a reboiler for an aniline recovery tower, comprising: a shell, an upper head, a lower head, a circulating liquid inlet, a first anti-impact baffle, a second anti-impact baffle, a first tube sheet, a second tube sheet, multiple baffles, multiple heat exchange tubes, and at least four solid tie rods.

[0006] The upper end cap is sealed at the top of the cylinder, the lower end cap is sealed at the bottom of the cylinder, a steam inlet is provided on the side wall of the cylinder near the top, the first anti-impact baffle is provided inside the cylinder and is located near the steam inlet, a circulating liquid inlet is provided at the bottom of the lower end cap, a second anti-impact baffle is provided inside the lower end cap and is located near the circulating liquid inlet, a steam condensate outlet is provided on the side wall of the cylinder near the bottom, and a gas outlet is provided at the top of the upper end cap.

[0007] The first tube sheet is disposed at the top of the cylinder, and the second tube sheet is disposed at the bottom of the cylinder. The first tube sheet is connected to the upper end cap, and the second tube sheet is connected to the lower end cap. Multiple heat exchange tubes are vertically arranged inside the cylinder. One end of each heat exchange tube passes through the first tube sheet and communicates with the interior of the upper end cap. The other end of each heat exchange tube passes through the second tube sheet and communicates with the interior of the lower end cap. Multiple baffles are arranged alternately in the cylinder. The top ends of four solid tie rods are detachably connected to the baffles inside the cylinder near the first tube sheet. The bottom ends of the four solid tie rods are connected to the second tube sheet. The solid tie rods pass through each baffle in the path. A spacer tube is sleeved on the solid tie rod between two adjacent baffles.

[0008] According to some embodiments of this application, the side wall near the top of the cylinder is also provided with an exhaust port, and the exhaust port is located above the steam inlet.

[0009] According to some embodiments of this application, a drain outlet is also provided on the side wall of the cylinder near the bottom, and the drain outlet is located below the steam condensate outlet.

[0010] According to some embodiments of this application, the aniline recovery tower reboiler further includes a top tube box flange and a bottom tube box flange, the first tube sheet is connected to the upper end cap through the top tube box flange, and the second tube sheet is connected to the lower end cap through the bottom tube box flange.

[0011] According to some embodiments of this application, the first anti-impact baffle includes a first bent portion, a first straight portion, and a second bent portion. The first bent portion, the first straight portion, and the second bent portion are connected in sequence. The first bent portion is inclined upward, and the second bent portion is inclined downward. The first bent portion and the second bent portion are bent toward the direction of the steam inlet.

[0012] According to some embodiments of this application, the first anti-impact baffle includes a third bending portion, a second straight portion, and a fourth bending portion. The third bending portion, the straight portion, and the fourth bending portion are connected in sequence. The third bending portion and the fourth bending portion are both inclined downwards and bend towards the circulating fluid inlet. The angle between the third bending portion and the fourth bending portion and the second straight portion is greater than 90°.

[0013] According to some embodiments of this application, the aniline recovery tower reboiler further includes at least two lug supports, which are symmetrically arranged at the middle position of the outer side wall of the cylinder.

[0014] According to some embodiments of this application, the aniline recovery tower reboiler further includes two first lifting lugs and two second lifting lugs, the two first lifting lugs being symmetrically arranged on the outer side wall of the upper head, and the two second lifting lugs being symmetrically arranged on the outer side wall of the lower head.

[0015] In this application, the alternating horizontal arrangement of baffles (especially with the stable support of solid tie rods and spaced tubes) forces a change in the shell-side steam flow direction, disrupting the laminar flow state and creating a turbulent effect, significantly improving the heat transfer coefficient between the outer wall of the heat exchange tubes and the steam. Unlike the traditional horizontal arrangement, the vertically arranged heat exchange tubes and alternating baffles form an "S"-shaped steam flow channel, extending the contact time, increasing the heat exchange area, and further enhancing heat transfer. At least four solid tie rods penetrate all the baffles, with the top end detachably connected to the top baffle and the bottom end detachably connected to the second tube sheet, forming a three-dimensional spatial positioning system. This structure effectively constrains the displacement of the baffles (especially resisting vibrations caused by steam impact). To ensure uniform flow field distribution, the first and second tube sheets are directly connected to the upper and lower heads, forming an integral pressure-bearing frame that improves the equipment's compressive strength and seismic performance. First and second anti-impact baffles are installed at the steam inlet and circulating liquid inlet, respectively. The curved surface of the baffles guides the flow, converting the kinetic energy of the high-speed fluid into pressure energy, preventing direct fluid impact on the tube bundle and reducing the risk of tube bundle vibration fatigue failure. The circulating liquid inlet is located at the bottom of the lower head, working in conjunction with the second anti-impact baffle to guide the fluid to a uniform distribution, reducing the scouring and wear of the tube bundle by localized eddies. The top baffle plate and solid tie rod are detachably connected by bolts or clips, facilitating modular assembly and disassembly of the baffle plate components, reducing maintenance difficulty and downtime. This application, through this configuration, using cross baffles, solid tie rod fixing, and anti-impact baffles, effectively addresses the shortcomings of traditional equipment.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0018] Figure 1 A schematic diagram of the structure of the aniline recovery tower reboiler provided for an embodiment of this application;

[0019] Figure 2 This is a top view of the cylinder provided in an embodiment of this application.

[0020] Figure label:

[0021] 100 cylinder, 110 baffle, 120 solid tie rod, 130 heat exchange tube, 140 lug support, 150 exhaust port, 160 steam inlet, 161 first anti-impact baffle, 170 steam condensate outlet, 180 drain port.

[0022] Upper end cap 200, gas outlet 210, first lifting lug 220, first tube sheet 230, top tube box flange 240;

[0023] Bottom end cap 300, circulating fluid inlet 310, second anti-impact baffle 311, second tube sheet 320, bottom tube box flange 330, second lifting lug 340. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0027] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0028] Aniline is an important chemical raw material, widely used in dyes, pharmaceuticals, rubber additives and other fields. In the process of aniline production or the treatment of aniline-containing waste liquid, aniline is often recovered through distillation towers. The reboiler, as one of the core equipment of the distillation tower, is responsible for providing continuous heat to the tower to maintain the vaporization of the material.

[0029] Traditional aniline recovery tower reboilers mostly adopt a shell-and-tube structure, but in actual operation, the following problems exist: Insufficient heat transfer efficiency: The flow paths of steam and circulating liquid are simple, and the steam in the shell side is prone to laminar flow, resulting in low heat exchange efficiency and high energy consumption; Poor structural stability: The baffles are prone to displacement due to lack of fixed support, affecting the flow field distribution; High-speed fluids at the steam inlet and circulating liquid inlet directly impact the tube bundle, causing vibration and wear.

[0030] To address the aforementioned problems, this application proposes a reboiler for an aniline recovery tower. The embodiments of this application will be further described below with reference to the accompanying drawings.

[0031] Reference Figures 1 to 2 This application provides a reboiler for an aniline recovery tower, comprising a cylindrical body 100, an upper end cap 200, a lower end cap 300, a circulating liquid inlet 310, a first anti-surge baffle 161, a second anti-surge baffle 311, a first tube sheet 230, a second tube sheet 320, multiple baffles 110, multiple heat exchange tubes 130, and at least four solid tie rods 120; the upper end cap 200 is sealed at the top of the cylindrical body 100, and the lower end cap 300 is sealed at the bottom of the cylindrical body 100. The cylindrical body 100 near the top... A steam inlet 160 is provided on the side wall. A first anti-impact baffle 161 is disposed inside the cylinder 100 and is positioned near the steam inlet 160. A circulating liquid inlet 310 is provided at the bottom of the lower head 300. A second anti-impact baffle 311 is disposed inside the lower head 300 and is positioned near the circulating liquid inlet 310. A steam condensate outlet 170 is provided on the side wall of the cylinder 100 near the bottom. A gas outlet is provided on the top of the upper head 200. The body has an outlet 210; a first tube sheet 230 is located at the top of the cylinder 100, and a second tube sheet 320 is located at the bottom of the cylinder 100. The first tube sheet 230 is connected to the upper end cap 200, and the second tube sheet 320 is connected to the lower end cap 300. Multiple heat exchange tubes 130 are vertically arranged inside the cylinder 100. One end of each heat exchange tube 130 passes through the first tube sheet 230 and communicates with the interior of the upper end cap 200. The other end of each heat exchange tube 130 passes through the second tube sheet 320. 0 and communicates with the interior of the lower head 300. Multiple baffles 110 are arranged alternately in the middle of the cylinder 100. The top ends of the four solid tie rods 120 are detachably connected to the baffles 110 near the first tube sheet 230 in the cylinder 100. The bottom ends of the four solid tie rods 120 are connected to the second tube sheet 320. The solid tie rods 120 pass through each baffle 110 in the path. A spacer tube is sleeved on the solid tie rods 120 between two adjacent baffles 110.

[0032] In some embodiments, the two ends of the first anti-impact baffle 161 are connected to the inner wall of the cylinder 100 by fastening bolts, and the two ends of the second anti-impact baffle 311 are also connected to the inner wall of the lower end cap 300 by fastening bolts.

[0033] In some embodiments, refer to Figure 1 It is equipped with six solid tie rods 120, which are divided into two groups. Each group of solid tie rods 120 includes four solid tie rods 120. One solid tie rod 120 in each group is set close to the inner wall of the cylinder 100, and the other two solid tie rods 120 are set vertically side by side close to the middle of the cylinder 100.

[0034] It should be noted that the baffles 110 are arranged in a horizontally intersecting (alternating laterally) pattern, forming a zigzag path for the fluid channel. This design increases turbulence by changing the direction of steam flow, extending the contact time between the steam and the heat exchange tubes 130, thereby improving heat exchange efficiency. All baffles 110 are connected and fixed by vertical solid tie rods 120. The two ends of the solid tie rods 120 are respectively connected to the first baffle 110 at the top and the first tube sheet 230 at the bottom inside the cylinder 100 via bolts. The baffles 110 are connected by bolts to ensure uniform spacing and stable position. The baffles 110 have a central opening to allow the solid tie rods 120 to pass through and be welded or fixed to one end of the corresponding spacer tubes via slots, forming a rigid support frame. The solid tie rods 120 also constrain the horizontal displacement of the baffles 110 to prevent structural loosening caused by vibration or fluid impact. The baffles 110 have dense through holes for multiple heat exchange tubes 130 to pass through vertically, which both supports the heat exchange tubes 130 to prevent bending and enhances the heat transfer effect through fluid flow.

[0035] In this embodiment, the baffle 110 serves the following purposes: (1) it forces the steam to flow back and forth laterally within the cylinder 100, avoiding the "short circuit" phenomenon (flowing directly to the outlet) and ensuring that the steam fully contacts the surface of the heat exchange tube 130; (2) by increasing the degree of turbulence, it disrupts the steam boundary layer and improves the convective heat transfer coefficient on both sides of the heat exchange tube 130; (3) it provides an intermediate support point for the heat exchange tube 130, reducing the risk of tube bundle vibration and extending the equipment life.

[0036] It should be noted that the two ends of the heat exchange tube 130 are respectively inserted into the first tube sheet 230 and the second tube sheet 320 and fixed by mechanical means or welding to form a tube bundle structure. This is the core support structure for the heat exchange tube 130 to exchange heat with steam. The second tube sheet 320 (bottom tube sheet) is located at the bottom of the shell 100 and is connected to the lower end cap 300, separating the circulating liquid inlet 310 (tube side) from the steam condensate outlet 170 (shell side). The first tube sheet 230 (top tube sheet) is located at the top of the shell 100 and is connected to the upper end cap 200, separating the gas outlet 210 (tube side) from the steam inlet 160 (shell side). Through the separation of the first tube sheet 230 and the second tube sheet 320, independent tube side (circulating liquid flow path) and shell side (steam flow path) are formed.

[0037] In this application, the alternating horizontal baffles 110 (especially in conjunction with the stable support of solid tie rods 120 and spaced tubes) forcibly change the shell-side steam flow direction, disrupting the laminar flow state and creating a turbulent effect, significantly improving the heat transfer coefficient between the outer wall of the heat exchange tube 130 and the steam. Unlike the traditional horizontal arrangement, the vertically arranged heat exchange tubes 130 and alternating baffles 110 form an "S"-shaped steam flow channel, extending the contact time, increasing the heat exchange area, and further enhancing heat transfer. At least four solid tie rods penetrate all the baffles 110, with the top end detachably connected to the top baffle 110 and the bottom end detachably connected to the second tube sheet 320, forming a three-dimensional spatial positioning system. This structure effectively constrains the displacement of the baffles 110 (especially resisting vibrations caused by steam impact). The system employs a combination of methods to ensure uniform flow field distribution. First and second tube sheets are directly connected to the upper and lower end caps, forming an integrated pressure-bearing frame that enhances the equipment's compressive strength and seismic performance. First and second anti-impact baffles 311 are installed at the steam inlet 160 and circulating liquid inlet 310, respectively. The curved surface of the baffles guides the flow, converting the kinetic energy of the high-speed fluid into pressure energy, preventing direct fluid impact on the tube bundle and reducing the risk of tube bundle vibration fatigue failure. The circulating liquid inlet 310 is positioned at the bottom of the lower end cap 300, working in conjunction with the second anti-impact baffle 311 to guide the fluid to a uniform distribution, reducing the scouring and wear of the tube bundle by localized eddies. The top baffle 110 and solid tie rod 120 are detachably connected by bolts or clips, facilitating modular assembly and disassembly of the baffle 110 assembly and reducing maintenance difficulty and downtime. This application, through this configuration—using cross baffles 110, solid tie rods 120, and anti-impact baffles—effectively addresses the shortcomings of traditional equipment.

[0038] In some embodiments, the top end of the solid tie rod 120 is threadedly connected to the baffle plate 110 located at the top of the cylinder and fixed by bolts; the bottom end of the solid tie rod 120 is also threadedly connected to the second tube sheet 320 and fixed by bolts.

[0039] Reference Figure 1 It is understandable that the side wall of the cylinder 100 near the top is also provided with an exhaust port 150, and the exhaust port 150 is located above the steam inlet 160.

[0040] It should be noted that when the steam pressure inside the cylinder 100 exceeds the set value, the exhaust port 150 can release gas (such as non-condensable steam or non-condensable gas) to prevent excessive internal pressure, thereby protecting the cylinder 100, end caps, and other critical components from overpressure damage and improving equipment operational safety. During steam condensation, non-condensable gases such as air will accumulate at the top of the cylinder 100 (due to the first anti-impact baffle 161 installed at the steam inlet 160, the gas naturally rises). The exhaust port 150 is located above the steam inlet 160 and can efficiently discharge such gases, preventing them from occupying heat exchange space and causing the following problems: reducing the contact area between steam and heat exchange tube 130, affecting heat transfer efficiency; and forming air resistance, hindering uniform steam distribution and condensate flow.

[0041] In some embodiments, a safety valve is installed at the vent 150 on the side wall of the cylinder 100, and a pressure detector is provided on the cylinder 100. The pressure inside the cylinder 100 is detected in real time by the pressure detector. When the pressure inside the cylinder 100 is too high, the safety valve is opened to release the pressure.

[0042] Reference Figure 1 It is understandable that a drain port 180 is provided on the side wall near the bottom of the cylinder 100, and the drain port 180 is located below the steam condensate outlet 170.

[0043] It should be noted that the drain outlet 180 is located below the condensate outlet and is used to periodically discharge impurities or residual liquid deposited inside the cylinder 100 to prevent blockage.

[0044] Reference Figure 1 It is understandable that the aniline recovery tower reboiler also includes a top tube box flange 240 and a bottom tube box flange 330. The first tube sheet 230 is connected to the upper end cap 200 through the top tube box flange 240, and the second tube sheet 320 is connected to the lower end cap 300 through the bottom tube box flange 330.

[0045] It should be noted that the top tube sheet flange 240 and the bottom tube sheet flange 330 are used to connect the first tube sheet 230 at the top and the second tube sheet 320 at the bottom of the shell 100, respectively, fixing and sealing the tube sheet to the end cap. This design achieves isolation between the tube side (the circulating liquid channel inside the heat exchange tube 130) and the shell side (the steam channel inside the shell 100), ensuring that the medium flows in the designated flow channel and avoiding leakage. At the same time, the flange connection method is easy to disassemble, facilitating cleaning, maintenance, or replacement of the heat exchange tube 130, tube sheet, or internal structure. Both the top tube sheet flange 240 and the bottom tube sheet flange are fastened with studs, nuts, and gaskets. The flanges play a role in fixing the tube sheet, ensuring the stable layout of the heat exchange tube 130. In addition, in conjunction with the solid tie rod 120, the spacer tube, and the baffle plate 110, the flow path and heat exchange efficiency of the shell-side steam are optimized.

[0046] It is understood that the first anti-impact baffle 161 includes a first bent portion, a first straight portion and a second bent portion, which are connected in sequence. The first bent portion is inclined upward and the second bent portion is inclined downward, and the first bent portion and the second bent portion are bent toward the steam inlet 160.

[0047] It should be noted that the first anti-impact baffle 161 is located inside the steam inlet 160 to buffer the steam flow rate and prevent direct impact on the heat exchange tube 130, thus avoiding vibration or wear. Specifically, the first bend is inclined upwards to disperse the steam impact force, preventing the steam from directly impacting the bottom of the equipment vertically, while guiding the steam upwards to promote uniform distribution. Through the transition of the first straight section and the downward inclination of the second bend, the steam is further guided to the area below the equipment, forming a stratified flow and reducing local turbulence and wear. The design of bending towards the steam inlet 160 effectively covers the direction of steam flow, directly buffering the impact of high-speed steam and protecting the inner wall of the equipment.

[0048] It is understood that the first anti-impact baffle 161 includes a third bend, a second straight section and a fourth bend, which are connected in sequence. The third bend and the fourth bend are both inclined downwards and bend towards the circulating fluid inlet 310. The angle between the third bend and the fourth bend and the second straight section is greater than 90°.

[0049] It should be noted that a second anti-impact baffle 311 is installed at the circulating fluid inlet 310 to prevent the circulating fluid from eroding and wearing a local area of ​​the lower end cap 300. Specifically, the third and fourth bends are inclined downwards and combined with an angle greater than 90° to form an outwardly expanding guide surface, which disperses the impact energy of the circulating fluid, reduces the flow velocity, and prevents the liquid from directly impacting sensitive components; the gentle transition structure reduces the risk of liquid splashing and cavitation, while guiding the liquid to flow along a predetermined path to avoid excessive local pressure; the design of bending towards the circulating fluid inlet 310 ensures that the baffle covers the main impact area of ​​the liquid flow, improving the guiding efficiency.

[0050] Reference Figure 1 It is understandable that the aniline recovery tower reboiler also includes at least two lug supports 140, which are symmetrically arranged in the middle of the outer wall of the cylinder 100.

[0051] In some embodiments, the aniline recovery tower reboiler includes two symmetrically arranged lug supports 140 symmetrically arranged in the middle of the outer side wall of the cylinder 100 to support the overall weight of the equipment and to be fixed to the external frame.

[0052] In some embodiments, refer to Figure 2The aniline recovery tower reboiler includes four lug supports 140, which are evenly distributed and installed in the middle of the outer wall of the shell 100. The four lug supports 140 are symmetrically distributed around the circumference of the shell 100, which can evenly transfer the weight of the equipment and external loads to the supporting structure, avoiding localized stress concentration. This design significantly reduces the risk of deformation of the shell due to uneven stress. Positioning the lug supports 140 in the middle of the shell 100 (close to the center of gravity) effectively reduces the bending moment caused by the equipment's own weight or external loads, preventing the shell 100 from bending or twisting in the vertical direction. This position also balances the load distribution between the top and bottom, improving the overall structural rigidity.

[0053] In some embodiments, an electrostatic grounding plate is provided on the lug support 140. The electrostatic grounding plate is integrated with the lug support 140 to discharge static electricity generated during equipment operation and prevent static electricity accumulation from causing safety hazards.

[0054] Reference Figure 1 It is understandable that the aniline recovery tower reboiler also includes two first lifting lugs 220 and two second lifting lugs 340. The two first lifting lugs 220 are symmetrically arranged on the outer side wall of the upper head 200, and the two second lifting lugs 340 are symmetrically arranged on the outer side wall of the lower head 300.

[0055] It should be noted that the four symmetrically distributed lifting lugs facilitate the hoisting and transportation of the equipment, with two lifting lugs at the top and two at the bottom to ensure balance.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0058] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An aniline recovery column reboiler characterized by, The aniline recovery tower reboiler comprises a cylinder, an upper head, a lower head, a circulating liquid inlet, a first anti-collision baffle, a second anti-collision baffle, a first tube plate, a second tube plate, a plurality of baffle plates, a plurality of heat exchange pipes and at least four solid rods. The upper head is arranged at the top of the cylinder, the lower head is arranged at the bottom of the cylinder, a steam inlet is arranged on the side wall of the cylinder near the top, the first anti-collision baffle is arranged in the cylinder, and the first anti-collision baffle is arranged near the steam inlet, a circulating liquid inlet is arranged on the bottom of the lower head, the second anti-collision baffle is arranged in the lower head, and the second anti-collision baffle is arranged near the circulating liquid inlet, a steam condensate outlet is arranged on the side wall of the cylinder near the bottom, and a gas outlet is arranged on the top of the upper head. The first tube plate is arranged at the top of the cylinder, the second tube plate is arranged at the bottom of the cylinder, the first tube plate is connected with the upper head, the second tube plate is connected with the lower head, a plurality of heat exchange pipes are vertically arranged in the cylinder, one end of each heat exchange pipe is arranged in the first tube plate and communicates with the inside of the upper head, the other end of each heat exchange pipe is arranged in the second tube plate and communicates with the inside of the lower head, a plurality of baffle plates are alternately arranged in the cylinder, the top ends of the four solid rods are respectively detachably connected with the baffle plates near the first tube plate in the cylinder, the bottom ends of the four solid rods are respectively connected with the second tube plate, and the solid rods penetrate through each baffle plate on the path, and a distance tube is arranged on the solid rod between two adjacent baffle plates. An exhaust port is arranged on the side wall of the cylinder near the top, and the exhaust port is arranged above the steam inlet.

2. The aniline recovery column reboiler of claim 1, wherein, A blowdown port is arranged on the side wall of the cylinder near the bottom, and the blowdown port is arranged below the steam condensate outlet.

3. The aniline recovery column reboiler of claim 1, wherein, The aniline recovery tower reboiler further comprises a top tube box flange and a bottom tube box flange, the first tube plate is connected with the upper head through the top tube box flange, and the second tube plate is connected with the lower head through the bottom tube box flange.

4. The aniline recovery column reboiler of claim 1, wherein, The first anti-collision baffle comprises a first bending part, a first straight part and a second bending part, the first bending part, the first straight part and the second bending part are sequentially connected, the first bending part is arranged obliquely upward, the second bending part is arranged obliquely downward, and the first bending part and the second bending part are bent toward the direction of the steam inlet.

5. The aniline recovery column reboiler of claim 1, wherein, The first anti-collision baffle comprises a third bending part, a second straight part and a fourth bending part, the third bending part, the straight part and the fourth bending part are sequentially connected, the third bending part and the fourth bending part are both arranged obliquely downward, the third bending part and the fourth bending part are bent toward the direction of the circulating liquid inlet, and the included angles between the third bending part, the fourth bending part and the second straight part are both greater than 90°.

6. The aniline recovery column reboiler of claim 1, wherein, The aniline recovery tower reboiler further comprises at least two ear supports, and the two ear supports are symmetrically arranged at the middle position of the outer wall of the cylinder.

7. The aniline recovery column reboiler of claim 1, wherein, ​ 8. The aniline recovery column reboiler of claim 1, wherein, The aniline recovery column reboiler further comprises two first lifting lugs and two second lifting lugs, the two first lifting lugs are symmetrically arranged on the outer side wall of the upper head, and the two second lifting lugs are symmetrically arranged on the outer side wall of the lower head.

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