A heat exchange device applied to a butene isomerization process

Abstract

The application relates to the field of heat exchange equipment, and discloses a heat exchange device applied to a butene isomerization process, which comprises a shell responsible for heat exchange of reaction materials, a front-end pipe box and a terminal pipe box at both ends of the shell, a heat exchange cavity is arranged in the middle of the inner side of the shell, a plurality of connecting ports are arranged on the tube plate, and the connecting ports on the same side are connected with the two ends of the heat transfer pipes at the corresponding positions respectively. A curved material conveying cavity composed of a plurality of baffle plates, top baffle plates and bottom baffle plates is arranged in the shell, so that the flow speed of the reaction materials in the heat exchange cavity can be delayed, the residence time and the heat exchange treatment time of the reaction materials in the heat exchange cavity of the device are prolonged, the high-temperature heat in the reaction materials can be discharged more quickly through the circulation type gas-liquid heat exchange mode and the hollow cross pipe which is connected with the heat exchange cavity, and therefore the heat exchange efficiency in the butene isomerization process can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of heat exchange equipment, in particular to a heat exchange device applied to a butene isomerization process. BACKGROUND

[0002] Isobutene is one of the scarce resources in China at present, and the demand for high-purity isobutene is increasing year by year. At present, most low-carbon alkanes are only used as fuel, and have very low added value, which is easy to cause resource waste. If low-carbon alkanes are used to synthesize low-carbon alkenes, the resource utilization value can be greatly improved, and there is a great cost advantage. Therefore, in recent years, the production of low-carbon alkenes from low-carbon alkanes has been paid more and more attention.

[0003] The butene isomerization equipment is used for converting normal butene in liquefied petroleum gas into isobutene under the action of a certain temperature, pressure and catalyst in an isomerization system. In the production process of isobutene, a heat exchanger is usually used for heat exchange treatment of products and raw materials in the production system. However, the existing plate heat exchanger and shell-and-tube heat exchanger have the problems of low heat exchange efficiency and poor heat exchange effect. Therefore, the technical personnel in the field propose a heat exchange device applied to a butene isomerization process to solve the above technical problems. SUMMARY

[0004] In view of the defects of the prior art, the application provides a heat exchange device applied to a butene isomerization process, which solves the problems of poor heat exchange efficiency and low heat exchange efficiency of the heat exchange equipment used for the butene isomerization process.

[0005] To achieve the above purpose, the application is implemented by the following technical scheme: a heat exchange device applied to a butene isomerization process, comprising a shell responsible for reaction material heat exchange, and a front-end pipe box and an end pipe box at both ends of the shell, a heat exchange cavity is arranged in the middle of the inner side of the shell, pipe plates are arranged at both ends of the heat exchange cavity, a plurality of connecting ports are arranged on the pipe plates, the connecting ports on the same side are respectively connected with the two ends of the corresponding position heat transfer pipes, the heat transfer pipes are respectively connected with the connecting ports at the corresponding positions in communication, gas guide pipes are arranged in the middle of the inner sides of the heat transfer pipes, a plurality of cross hollow pipes are equidistantly arranged on the heat transfer pipes, and the inner ends of the cross hollow pipes respectively penetrate the heat transfer pipes at the corresponding positions and communicate with the gas guide pipes in the heat transfer pipes.

[0006] Preferably, a plurality of second baffles are arranged in the middle of the inner side of the heat exchange cavity, top baffle plates are arranged on one side of the top ends of the second baffles, and bottom baffle plates are arranged on one side of the bottom ends of the second baffles. The heat exchange cavity is divided into a plurality of curved connection cavities by the second baffles and the top baffle plates and the bottom baffle plates at different positions.

[0007] Preferably, one end of the shell is provided with a front end pipe box, the inner middle part of the front end pipe box is provided with a partition one, the inside of the front end pipe box is divided into an upper partition cavity and a lower partition cavity by the partition one, the upper and lower ends of the partition one are respectively provided with a front end gas storage seat and a tail end gas discharge seat, and the inside of the front end gas storage seat and the tail end gas discharge seat respectively communicates with the inside of the corresponding position gas guide pipe.

[0008] Preferably, the top middle part of the front end gas storage seat is provided with a liquid inlet pipe, and the liquid inlet pipe communicates with the inside of the upper partition cavity, the top middle part of the front end gas storage seat is provided with a liquid discharge pipe, and the liquid discharge pipe communicates with the inside of the lower partition cavity, the top middle part of the front end gas storage seat communicates with one end of the gas inlet pipe, the other end of the gas inlet pipe penetrates the liquid inlet pipe and extends outward, the bottom middle part of the tail end gas discharge seat communicates with one end of the gas discharge pipe, and the other end of the gas discharge pipe penetrates the liquid discharge pipe and extends outward.

[0009] Preferably, the shell is provided with a tail end pipe box away from the front end pipe box, the inside of the tail end pipe box is provided with a floating head seat, the floating head seat is provided with a hook ring near one end of the shell, the hook ring is connected with the middle part of the four sides of the pipe plate on one side through the connecting bolt, the inside of the floating head seat is provided with a fixed plate on one side of the middle part, the middle part of the fixed plate is provided with a relay gas storage seat, and the inside of the relay gas storage seat communicates with the inside of the gas guide pipe.

[0010] Preferably, the outer wall of the shell is provided with a sealing flange seat at both ends, the front end pipe box and the tail end pipe box are provided with a connecting flange seat near one end of the shell, and the connecting flange seat and the sealing flange seat on the same side are connected through the connecting bolt.

[0011] Preferably, the top side of the shell is provided with a material inlet pipe, and the material inlet pipe communicates with the inside of the heat exchange cavity, the bottom side of the shell away from the material inlet pipe is provided with a material discharge pipe, and the inside of the material discharge pipe communicates with the inside of the heat exchange cavity.

[0012] Preferably, the bottom end of the shell is provided with a support seat on both sides, the bottom end of the support seat on the same side is provided with a support column on both sides, and the bottom end of the support column on the same side is respectively fixedly connected to the top middle part of the corresponding position base.

[0013] Working Principle: After the butene isomerization equipment has finished processing the reactants, its discharge port is connected to the material inlet pipe of this equipment via a pipeline. This allows the reactants, after the reaction is complete, to be discharged into the heat exchange chamber of the shell through the material inlet pipe. Inside the heat exchange chamber, the reactants are transported and moved through a curved circulation chamber composed of multiple baffles, a top baffle, and a bottom baffle. The flow velocity of the reactants within the heat exchange chamber is slowed by the top baffle, the bottom baffle, and the cross-shaped hollow tubes on the heat transfer tubes. Simultaneously, the cross-shaped hollow tubes also conduct heat from the reactants to the cooler parts of the heat transfer tubes through their internal cavities. The cooling liquid and circulating air in the air guide pipes are cooled to improve the overall heat exchange efficiency of the equipment. Simultaneously, the cooling liquid enters the upper compartment of the front-end tube box through the liquid inlet pipe. The cooling liquid in the upper compartment then flows through the connection port on the upper half of the tube sheet into the upper half of the heat transfer tubes in the heat exchange chamber, absorbing the heat from the reactants. This causes the cooling liquid in the heat transfer tubes to heat up. The cooling liquid then flows into the float head seat, and from there, it enters the lower half of the heat transfer tubes in the heat exchange chamber through the connection port on the lower half of the tube sheet. The cooling liquid inside the heat exchange chamber absorbs heat from the reactants again. As the cooling liquid flows through the heat transfer tubes, it eventually enters the lower compartment of the front-end tube box. The cooling liquid in the lower compartment is then discharged through the liquid drain pipe. Simultaneously, circulating air is introduced into the front-end gas reservoir in the upper compartment through the gas inlet pipe. The circulating air then enters the upper heat transfer tubes through the various air guide pipes in the upper part of the heat exchange tubes. During its flow, the circulating air absorbs heat from the heated cooling liquid within the heat transfer tubes. As the circulating air flows through the air guide pipes, it further absorbs heat from the heated cooling liquid within the heat transfer tubes. The heated gas in the upper gas duct enters the intermediate gas storage seat in the floating head seat. Then, the circulating air in the intermediate gas storage seat enters the gas duct in the lower heat transfer tube, absorbing heat from the cooling liquid in the heat transfer tube again, thus heating the circulating air in the gas duct. Finally, with the flow of the circulating air, the heated circulating air enters the end exhaust seat in the front tube box. Then, the heated circulating air in the end exhaust seat is discharged through the gas exhaust pipe, thus completing one heat exchange treatment of the reactants in the butene isomerization process. Repeating the above operation can complete the heat exchange treatment of the reactants in the butene isomerization process.

[0014] This invention provides a heat exchange device for use in a butene isomerization process. It has the following beneficial effects:

[0015] 1、The present application can delay the flow speed of the reaction material in the heat exchange cavity, prolong the residence time of the reaction material in the device heat exchange cavity and the heat exchange treatment time, and more quickly export the high-temperature heat in the reaction material through the circulating gas-liquid heat exchange mode and the cross hollow pipe connected thereto, thereby improving the heat exchange efficiency in the butene isomerization process and the heat exchange efficiency, and facilitating the use of the user.

[0016] 2、In the device, the heat transfer pipe and the shell are not constrained by thermal deformation, so that when the device is used, thermal stress is not generated, and when there is a temperature difference between the heat transfer pipe and the shell, and the shell and the heat transfer pipe expand, since they are not constrained, thermal stress is not generated, thereby extending the service life of the overall device in use.

[0017] 3、The present application is designed in a detachable manner, and a large amount of oil is generated when the reaction material in the butene isomerization process is heat exchanged by the device, so that the overall equipment can be periodically disassembled in stages, so that the residual substances in the shell heat exchange cavity and the heat transfer pipe can be cleaned and removed, and the subsequent device can be used normally. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the front view structure diagram of the overall device of the present application;

[0019] Figure 2 is the internal structure of the front pipe box of the present application;

[0020] Figure 3 is the internal structure of the shell of the present application;

[0021] Figure 4 is the internal structure of the end pipe box of the present application;

[0022] Figure 5 is the internal structure of the shell of the present application;

[0023] Figure 6 is the local structure of the heat transfer pipe of the present application;

[0024] Figure 7 is the cross-sectional structure of the heat transfer pipe of the present application.

[0025] Wherein, 1, shell; 2, base; 3, gas exhaust pipe; 4, liquid exhaust pipe; 5, front end pipe box; 6, liquid inlet pipe; 7, gas inlet pipe; 8, material inlet pipe; 9, support base; 10, support column; 11, connecting flange base; 12, sealing flange base; 13, end pipe box; 14, material exhaust pipe; 15, front end gas storage seat; 16, upper partition cavity; 17, partition plate one; 18, lower partition cavity; 19, end exhaust seat; 20, tube plate; 21, connecting port; 22, top baffle; 23, partition plate two; 24, cross hollow pipe; 25, bottom baffle; 26, heat transfer pipe; 27, relay gas storage seat; 28, fixed plate; 29, floating head seat; 30, hook ring; 31, gas guide pipe; 32, heat exchange cavity. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application specification. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] Embodiment:

[0028] Please refer to the drawings of the present application Figure 1 - the drawings of the present application Figure 7 The heat exchange device applied to butene isomerization process provided by the embodiments of the present application comprises a shell 1 responsible for heat exchange of reaction materials and front end pipe boxes 5 and end pipe boxes 13 at both ends of the shell 1. The inner side middle part of the shell 1 is provided with a heat exchange cavity 32. Both ends of the heat exchange cavity 32 are provided with tube plates 20. The tube plates 20 are provided with a plurality of connecting ports 21. The same side connecting ports 21 are respectively connected with both ends of the corresponding position heat transfer pipes 26. The inner parts of the heat transfer pipes 26 are respectively communicated with the corresponding position connecting ports 21. The inner side middle parts of the heat transfer pipes 26 are provided with gas guide pipes 31. The heat transfer pipes 26 are provided with a plurality of cross hollow pipes 24 at equal intervals. The inner ends of the cross hollow pipes 24 respectively penetrate the heat transfer pipes 26 at the corresponding positions and are communicated with the gas guide pipes 31 inside the heat transfer pipes 26.

[0029] The overall device is composed of three large parts of the shell 1, the front end pipe boxes 5 and the end pipe boxes 13. The front end pipe boxes 5 and the end pipe boxes 13 are mainly used for circulation of gas and flow of cooling liquid. The heat exchange cavity 32 in the shell 1 is the position for heat exchange treatment of reaction materials.

[0030] The shell 1 is provided with a material inlet pipe 8 at the top end side. The material inlet pipe 8 is communicated with the inside of the heat exchange cavity 32. The bottom end side of the shell 1 away from the material inlet pipe 8 is provided with a material exhaust pipe 14. The inside of the material exhaust pipe 14 is communicated with the inside of the heat exchange cavity 32.

[0031] Please refer to the drawings of the present applicationFigure 3 The inner middle part of the heat exchange cavity 32 is provided with a plurality of baffle plates 23, the top end side of each baffle plate 23 is provided with a top baffle plate 22, the bottom end side of each baffle plate 23 is provided with a bottom baffle plate 25, and the heat exchange cavity 32 is divided into a plurality of curved connecting cavities by the baffle plates 23 and the top baffle plates 22 and the bottom baffle plates 25 at different positions.

[0032] The reaction material entering the heat exchange cavity 32 is transported and moved in the curved circulating cavity composed of the baffle plates 23 and the top baffle plates 22 and the bottom baffle plates 25, and the reaction material in the heat exchange cavity 32 is slowed down in the heat exchange cavity 32 by the top baffle plates 22, the bottom baffle plates 25 and the cross hollow pipes 24 on the heat transfer pipes 26, and the cross hollow pipes 24 can also conduct the heat in the reaction material to the cooling liquid in the heat transfer pipes 26 and the circulating air in the air guide pipes 31 through the cavities inside the cross hollow pipes 24, thereby improving the heat exchange efficiency of the whole equipment.

[0033] Please refer to the accompanying drawings Figure 2 One end of the shell 1 is provided with a front end pipe box 5, the inner middle part of the front end pipe box 5 is provided with a baffle plate 17, the inside of the front end pipe box 5 is divided into an upper separation cavity 16 and a lower separation cavity 18 by the baffle plate 17, the upper and lower end sides of the baffle plate 17 are respectively provided with a front end gas storage seat 15 and a tail end gas discharge seat 19, and the inside of the front end gas storage seat 15 and the tail end gas discharge seat 19 respectively communicates with the inside of the corresponding air guide pipe 31.

[0034] The top middle part of the front end gas storage seat 15 is provided with a liquid inlet pipe 6, and the liquid inlet pipe 6 communicates with the inside of the upper separation cavity 16, the top middle part of the front end gas storage seat 15 is provided with a liquid discharge pipe 4, and the liquid discharge pipe 4 communicates with the inside of the lower separation cavity 18, the top middle part of the front end gas storage seat 15 communicates with one end of a gas inlet pipe 7, the other end of the gas inlet pipe 7 penetrates the liquid inlet pipe 6 and extends outward, the bottom middle part of the tail end gas discharge seat 19 communicates with one end of a gas discharge pipe 3, and the other end of the gas discharge pipe 3 penetrates the liquid discharge pipe 4 and extends outward.

[0035] The cooling liquid enters the upper partition cavity 16 of the front end tube box 5 through the liquid inlet pipe 6. The cooling liquid entering the upper partition cavity 16 enters the upper half of the heat transfer pipe 26 in the heat exchange cavity 32 through the connecting port 21 of the upper half of the tube plate 20, absorbs the heat of the reaction material in the heat exchange cavity 32, and makes the cooling liquid in the heat transfer pipe 26 warm. The cooling liquid in the heat transfer pipe 26 flows into the floating head seat 29. The cooling liquid entering the floating head seat 29 absorbs the heat of the cooling liquid, so that the cooling liquid in the floating head seat 29 enters the lower half of the heat transfer pipe 26 in the heat exchange cavity 32 through the connecting port 21 of the lower half of the tube plate 20. The cooling liquid in the heat transfer pipe 26 absorbs the heat of the reaction material in the heat exchange cavity 32 again. With the flow of the cooling liquid in the heat transfer pipe 26, the cooling liquid in the lower half of the heat transfer pipe 26 finally enters the lower partition cavity 18 of the front end tube box 5. Then the cooling liquid in the lower partition cavity 18 is discharged through the liquid discharge pipe 4.

[0036] Please refer to the accompanying drawings Figure 4 The end tube box 13 is arranged on the end of the shell 1 away from the front end tube box 5. The floating head seat 29 is arranged in the end tube box 13. The hook ring 30 is arranged on the end of the floating head seat 29 close to the shell 1. The hook ring 30 is connected to the middle part of the tube plate 20 on one side through connecting bolts. The fixed plate 28 is arranged on one side of the middle part of the inner side of the floating head seat 29. The relay gas storage seat 27 is arranged in the middle part of the fixed plate 28. The inner part of the relay gas storage seat 27 is in communication with the inner part of the gas guide pipe 31.

[0037] At the same time of injecting the cooling liquid, the circulating air is discharged into the front end gas storage seat 15 in the upper partition cavity 16 through the gas inlet pipe 7. The circulating air entering the front end gas storage seat 15 enters the upper half of the heat transfer pipe 26 through each gas guide pipe 31 of the upper half. The circulating air in the gas guide pipe 31 absorbs the heat of the cooling liquid in the heat transfer pipe 26, and enters the relay gas storage seat 27 in the floating head seat 29 with the flow of the circulating air in the gas guide pipe 31.

[0038] Then the circulating air in the relay gas storage seat 27 enters the gas guide pipe 31 in the lower half of the heat transfer pipe 26, and absorbs the heat of the cooling liquid in the heat transfer pipe 26 again, so that the circulating air in the gas guide pipe 31 is warmed up, and finally enters the end gas discharge seat 19 in the front end tube box 5 with the flow of the circulating air, and then the warmed circulating air in the end gas discharge seat 19 is discharged through the gas discharge pipe 3.

[0039] Please refer to the accompanying drawings Figure 6 - the accompanying drawings Figure 7The cross hollow tube 24 on the heat transfer pipe 26 can guide the heat in the reactant in the shell 1 heat exchange cavity 32 into the inside of the heat transfer pipe 26 through the cross hollow tube 24, slow down the flow speed of the cooling water in the heat transfer pipe 26, increase the residence time of the cooling liquid in the heat transfer pipe 26, so that the flow in the reactant can be better and faster into the cooling liquid in the heat transfer pipe 26 and the circulating air in the air guide pipe 31, improve the heat exchange efficiency of the reactant in the heat exchange cavity 32, on the other hand, the cross hollow tube 24 can also slow down the flow speed of the material in the heat exchange cavity 32, thereby increasing the residence time of the reactant in the heat exchange cavity 32, thereby improving the heat exchange treatment effect of the reactant in the heat exchange cavity 32.

[0040] Please refer to the attached drawings Figure 5 When the reactant in the butene isomerization process is heat exchanged by the device, a large amount of oil is generated, and the staff can periodically disassemble the overall equipment in stages, so that the residual substances in the shell 1 heat exchange cavity 32 and the heat transfer pipe 26 can be cleaned and removed, and the subsequent device can be used normally.

[0041] The outer wall of the shell 1 is provided with a sealing flange seat 12 at both ends, and the front end pipe box 5 and the end pipe box 13 are provided with a connecting flange seat 11 near one end of the shell 1. The connecting flange seat 11 and the sealing flange seat 12 on the same side are connected by connecting bolts.

[0042] When the shell 1 and the front end pipe box 5 and the end pipe box 13 at both ends are connected, the sealing flange seat 12 on the shell 1 and the connecting flange seat 11 on the front end pipe box 5 and the end pipe box 13 are connected by connecting bolts, so that the sealing property of the overall device can be guaranteed during use, and leakage during use can be prevented.

[0043] The bottom of the shell 1 is provided with a support seat 9 on both sides, and the bottom of the support column 10 on the same side is fixedly connected to the top of the base 2 on both sides of the corresponding position.

[0044] The overall device is supported by the support seat 9, the support column 10 and the base 2 at the bottom during use, thereby improving the stability of the overall device during use.

[0045] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A heat exchange device for a butene isomerization process, comprising a shell (1) responsible for heat exchange of the reactants and front-end tube boxes (5) and end tube boxes (13) at both ends of the shell (1), characterized in that, A heat exchange chamber (32) is provided in the middle of the inner side of the shell (1). Tube sheets (20) are provided at both ends of the heat exchange chamber (32). Multiple connection ports (21) are provided on the tube sheets (20). The connection ports (21) on the same side are connected to the two ends of the heat transfer tubes (26) at the corresponding positions. The interior of the heat transfer tubes (26) is connected to the connection ports (21) at the corresponding positions. A gas guide pipe (31) is provided in the middle of the inner side of the heat transfer tubes (26). Multiple cross hollow tubes (24) are provided at equal intervals on the heat transfer tubes (26). The inner ends of the cross hollow tubes (24) pass through the heat transfer tubes (26) at the corresponding positions and are connected to the gas guide pipes (31) inside them. The heat exchange cavity (32) is provided with multiple partition plates (23) in the middle of its inner side. Each partition plate (23) has a top baffle plate (22) on one side of its top end and a bottom baffle plate (25) on one side of its bottom end. The heat exchange cavity (32) is divided into multiple curved connecting cavities by the partition plates (23) at different positions and the top baffle plate (22) and bottom baffle plate (25). A front end tube box (5) is provided on one end of the housing (1). A partition (17) is provided in the middle of the inner side of the front end tube box (5). The interior space of the front end tube box (5) is divided into an upper upper cavity (16) and a lower lower cavity (18) by the partition (17). A front end air storage seat (15) and an end exhaust seat (19) are respectively provided on the upper and lower ends of the partition (17). The interiors of the front end air storage seat (15) and the end exhaust seat (19) are respectively connected to the interiors of the corresponding air guide pipes (31). A liquid inlet pipe (6) is provided on one side of the top middle of the front gas storage seat (15), and the liquid inlet pipe (6) is connected to the interior of the upper diaphragm (16). A liquid outlet pipe (4) is provided on one side of the top middle of the front gas storage seat (15), and the liquid outlet pipe (4) is connected to the interior of the lower diaphragm (18). The top middle of the front gas storage seat (15) is connected to one end of the gas inlet pipe (7), and the other end of the gas inlet pipe (7) passes through the liquid inlet pipe (6) and extends outward. The bottom middle of the end exhaust seat (19) is connected to one end of the gas outlet pipe (3), and the other end of the gas outlet pipe (3) passes through the liquid outlet pipe (4) and extends outward. An end tube box (13) is provided on the end of the housing (1) away from the front tube box (5). A float seat (29) is provided inside the end tube box (13). A hook ring (30) is provided on the end of the float seat (29) near the housing (1). The hook ring (30) is connected to the middle periphery of the tube plate (20) on one side by connecting bolts. A fixing plate (28) is provided on one side of the inner middle of the float seat (29). A relay gas storage seat (27) is provided in the middle of the fixing plate (28). The interior of the relay gas storage seat (27) is connected to the interior of the gas guide pipe (31).

2. The heat exchange device for butene isomerization process according to claim 1, characterized in that, Sealing flange seats (12) are provided at both ends of the outer wall of the shell (1). Connecting flange seats (11) are provided on the end of the front pipe box (5) and the end pipe box (13) near the shell (1). The connecting flange seats (11) and the sealing flange seats (12) on the same side are connected by connecting bolts.

3. The heat exchange device for butene isomerization process according to claim 1, characterized in that, A material inlet pipe (8) is provided on one side of the top of the shell (1), and the material inlet pipe (8) is connected to the interior of the heat exchange chamber (32). A material outlet pipe (14) is provided on the bottom side of the shell (1) away from the material inlet pipe (8), and the interior of the material outlet pipe (14) is connected to the interior of the heat exchange chamber (32).

4. A heat exchange device for butene isomerization process according to claim 1, characterized in that, The bottom of the housing (1) is provided with support bases (9) on both sides, and support columns (10) are provided on both sides of the bottom of the support bases (9) on the same side. The bottom ends of the support columns (10) on the same side are respectively fixedly connected to the top center of the corresponding base (2) on both sides.

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