Dehydrogenation reactor pressure stabilizer

Abstract

The utility model discloses a dehydrogenation reactor pressure stabilizing device which comprises a support, a tank body arranged on the support, a corrugated cylinder body arranged at the bottom in the tank body, a sealing plate arranged at the upper end of the corrugated cylinder body, a sealing plate fixedly connected with a bottom plate of the tank body in a sealing mode, and a gas inlet / outlet arranged on the sealing plate. The side wall of the upper end of the tank body is provided with an air inlet, the bottom of the tank body is provided with an exhaust port and an inflation port, a bottom plate of the tank body is provided with an installation hole, the interior of the installation hole is rotationally connected with a rotating shaft, and the upper end of the rotating shaft extends into the corrugated cylinder to be connected with a guide pipe fixedly connected with the bottom of the sealing plate. A driving mechanism for driving the rotating shaft to rotate is arranged at the lower end of the rotating shaft, the exhaust port is connected with a first exhaust pipe, an electromagnetic valve is arranged on the first exhaust pipe, the sealing plate is disc-shaped, and a first annular groove is formed in the side wall of the sealing plate in the circumferential direction. The pressure stabilizing buffering device is good in pressure stabilizing buffering effect and adjustable in pressure stabilizing range.

Description

Technical Field

[0001] This utility model relates to the technical field of dehydrogenation reactor pressure stabilization equipment, and in particular to a dehydrogenation reactor pressure stabilization device. Background Technology

[0002] Benzene is an important basic raw material in the petrochemical industry, and is the fourth largest ethylene derivative product after polyethylene (PE), polyvinyl chloride (PVC), and ethylene oxide (EO). It is mainly used in the production and preparation of polystyrene (PS), styrene-butadiene rubber (SBR), propylene butadiene-styrene (ABS) resin, styrene-butene-styrene block copolymer (SBS), styrene-acrylonitrile (SAN) resin, and unsaturated polyesters, and is widely used in electronics, automobiles, construction, packaging, and daily light industrial products.

[0003] Currently, the benzene dehydrogenation process involves superheating steam to 800°C and then introducing it along with ethylbenzene into an adiabatic reactor. The reaction temperature is 550-650°C, and the steam / ethylbenzene mass ratio is 1.0-1.5. The dehydrogenation products generated in the dehydrogenation reactor are condensed and then enter an ethylbenzene / styrene separation tower. Styrene is separated at the bottom of the tower, and unreacted ethylbenzene is distilled off at the top. However, unstable gas pressure inside the dehydrogenation reactor leads to reaction instability, hindering the forward reaction. This can cause intensified non-catalytic thermal cracking and deep dehydrogenation, resulting in reduced selectivity. Furthermore, prolonged use and pump failure can cause the gas pressure inside the dehydrogenation reactor to become uncontrollable. Utility Model Content

[0004] This invention provides a pressure stabilizing device for a dehydrogenation reactor, which solves the problems of unstable gas pressure inside traditional dehydrogenation reactors, small adjustment range, and inability to adjust gas pressure when the gas pump fails.

[0005] This utility model provides a pressure stabilizing device for a dehydrogenation reactor, including a support frame, a tank body mounted on the support frame, a corrugated cylinder body mounted at the bottom of the tank body, a sealing plate mounted on the upper end of the corrugated cylinder body, and a sealed connection and fixed connection between the lower end of the corrugated cylinder body and the bottom plate of the tank body. The four sides of the sealing plate body slide in a guide fit with the inner wall of the tank body. An inlet and outlet are provided on the top of the sealing plate body, and one end of the inlet and outlet are connected to a gas supply pipe. The other end of the gas supply pipe is fixedly connected to an air bladder. An inlet is provided on the upper side wall of the tank body body, and an outlet and an inflation port are provided at the bottom of the tank body body. A mounting hole is provided on the bottom plate of the tank body body, and a rotating shaft is rotatably connected in the mounting hole. The upper end of the rotating shaft extends into the corrugated cylinder body and connects to a guide pipe fixedly connected to the bottom of the sealing plate. A driving mechanism for driving the rotation of the rotating shaft is provided at the lower end of the rotating shaft body.

[0006] In the above technical solution, the exhaust port is further connected to a first exhaust pipe, and a solenoid valve is installed on the first exhaust pipe.

[0007] In the above technical solution, a second annular groove is further provided on the inner wall of the mounting hole along the circumferential direction, and a second sealing ring is provided in the second annular groove.

[0008] In the above technical solution, further, multiple guide wheels are provided around the top of the sealing plate, and the roller portion of each guide wheel is embedded in the vertical groove correspondingly provided on the side wall of the tank for guidance and cooperation.

[0009] In the above technical solution, the driving mechanism further includes a motor support, a drive motor, a first pulley, a transmission belt, and a second pulley. The motor support is fixedly mounted on the bracket, and the drive motor is mounted on the motor support. The first pulley is coaxially fixedly mounted on the output shaft of the drive motor, and the second pulley is coaxially mounted on the lower end of the rotating shaft. The first pulley and the second pulley are connected for transmission via the transmission belt.

[0010] In the above technical solution, an air pump is further provided on the bracket, the air pump is connected to the inflation port through a gas delivery pipe, and a gas regulating valve is provided on the gas delivery pipe.

[0011] As can be seen from the above technical solutions, this utility model provides a pressure stabilizing device for a dehydrogenation reactor.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By inflating the gasbag, the gas entering the tank is buffered, preventing drastic changes in gas pressure inside the dehydrogenation reactor. This ensures good safety, maintains stable gas pressure inside the dehydrogenation reactor, promotes the positive reaction inside the reactor, and prevents non-catalytic thermal cracking.

[0014] 2. The drive mechanism drives the rotating shaft to cooperate with the guide tube, so that the sealing plate drives the corrugated cylinder to change its internal space size, and replenishes the air pressure inside the airbag. This allows the airbag to adjust the buffer air pressure of the dehydrogenation reactor even when the air pump fails and cannot supply air. The adjustment speed is fast and the adjustment range is large. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a dehydrogenation reactor pressure stabilizing device proposed in this utility model;

[0017] Figure 2This is a partial structural schematic diagram of a dehydrogenation reactor pressure stabilizing device proposed in this utility model;

[0018] Figure 3 This is a front view schematic diagram of the overall structure of a dehydrogenation reactor pressure stabilizing device proposed in this utility model;

[0019] Figure 4 Appendix to this utility model Figure 3 AA sectional view;

[0020] Figure 5 This is a schematic diagram of the guide wheel installation structure of a dehydrogenation reactor pressure stabilization device proposed in this utility model.

[0021] In the picture:

[0022] 1-Staff;

[0023] 2-Tank body; 21-Bottom plate; 22-Air inlet; 23-Exhaust outlet; 24-Inflation port; 25-Mounting hole; 231-First exhaust pipe; 232-Solenoid valve; 251-Second annular groove; 252-Second sealing ring;

[0024] 3-Corrugated cylinder;

[0025] 4-Sealing plate; 41-Air inlet / outlet; 42-Air supply pipe; 43-Airbag; 46-Guide wheel; 460-Wheel seat; 461-Roller; 462-Vertical groove;

[0026] 5- Rotating shaft;

[0027] 6-Guide tube;

[0028] 7-Drive mechanism; 71-Motor support; 72-Drive motor; 73-First pulley; 74-Transmission belt; 75-Second pulley;

[0029] 8-Air pump; 81-Gas delivery pipe; 82-Gas regulating valve. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] Example 1:

[0032] See Figure 1-5A pressure stabilizing device for a dehydrogenation reactor includes a support frame 1 with four legs. A vertically mounted tank 2 is mounted on the support frame 1. The tank 2 is sealed at both ends. A corrugated cylinder 3 is installed at the bottom of the tank 2. A sealing plate 4 is installed at the upper end of the corrugated cylinder 3 to seal it. The lower end of the corrugated cylinder 3 is sealed and fixed to the bottom plate 21 of the tank 2. The corrugated cylinder 3 can expand and contract to change the internal space, thereby changing the gas pressure inside the corrugated cylinder 3. The sealing plate 4 is a disc. The sealing plate 4 has a sliding fit with the inner wall of the tank body 2 around its four sides. The up and down movement of the sealing plate 4 can drive the corrugated cylinder 3 to extend and retract, changing the size of the internal space. An air inlet and outlet 41 is provided in the middle of the upper part of the sealing plate 4. The air inlet and outlet 41 is connected to one end of the air supply pipe 42. The other end of the air supply pipe 42 is fixedly connected to the air bag 43 to facilitate the inflation of the air bag 43. An air inlet 22 is provided on the upper side wall of the tank body 2 and connected to the air inlet connector. An exhaust port 23 and an inflation port 24 are provided at the bottom of the tank body 2. The bottom plate 21 of the tank body 2 is... The tank body 2 has a mounting hole 25, and a rotating shaft 5 is rotatably connected inside the mounting hole 25. A bearing seat is provided at the bottom of the bottom plate 21 of the tank body 2 and is rotatably connected to the rotating shaft 5. The upper end of the rotating shaft 5 extends into the corrugated cylinder 3 and is connected to the guide pipe 6 fixedly connected to the bottom of the sealing plate 4. A drive mechanism 7 is provided at the lower end of the rotating shaft 5 to drive its rotation. The gas in the reactor enters the tank body 2. By inflating the gas bag 43, the gas entering the tank body 2 is buffered to prevent drastic changes in the gas pressure inside the dehydrogenation reactor. The drive mechanism 7 drives the rotating shaft 5 to cooperate with the guide pipe 6, so that the sealing plate 4 drives the corrugated cylinder 3 to change its internal space size, and replenishes the gas pressure inside the gas bag 43. This allows the gas bag 43 to adjust the buffer gas pressure of the dehydrogenation reactor even when the gas pump fails and cannot supply gas. The adjustment speed is fast and the safety is good. It ensures the stability of the gas pressure inside the dehydrogenation reactor, which is conducive to the reaction inside the dehydrogenation reactor proceeding in the positive direction and prevents the reaction from causing non-catalytic thermal cracking and intensifying the deep dehydrogenation reaction.

[0033] In this embodiment, see Figure 3 The exhaust port 23 is connected to the first exhaust pipe 231. The first exhaust pipe 231 is equipped with a solenoid valve 232. The exhaust of the first exhaust pipe 231 is controlled by the solenoid valve 232, thereby automatically adjusting the gas pressure inside the airbag 43.

[0034] In this embodiment, see Figure 4 A second annular groove 251 is provided on the inner wall of the mounting hole 25 along the circumferential direction, and a second sealing ring 252 is provided in the second annular groove 251. The second sealing ring 252 can prevent the gas inside the corrugated cylinder 3 from leaking from the inside of the mounting hole 25.

[0035] In this embodiment, see Figure 4 , 5Three guide wheels 46 are provided around the top of the sealing plate 4. Each guide wheel 46 includes a wheel seat 460 and a roller 461. The wheel seat 460 is installed on the sealing plate 4. The roller 461 of each guide wheel 46 is partially embedded in the vertical groove 462 provided on the side wall of the tank body 2 for guidance and cooperation. The sealing plate 4 can only move vertically and cannot rotate.

[0036] In this embodiment, see Figure 4 The inner wall of the guide tube 6 is provided with an internal thread, and the outer wall of the upper end of the rotating shaft 5 is provided with an external thread. The upper end of the rotating shaft 5 is threadedly connected to the internal thread hole of the guide tube 6. The external thread on the rotating shaft 5 matches the internal thread on the inner wall of the guide tube 6. The rotation of the rotating shaft 5 drives the guide tube 6 to move up and down, thereby adjusting the height of the corrugated cylinder 3.

[0037] In this embodiment, see Figure 2 The drive mechanism 7 includes a motor support 71, a drive motor 72, a first pulley 73, a transmission belt 74, and a second pulley 75. The motor support 71 is fixedly mounted on the bracket 1. The drive motor 72 is mounted on the motor support 71. The drive motor 72 is a stepper motor. The first pulley 73 is coaxially fixed on the output shaft of the drive motor 72. The second pulley 75 is coaxially mounted on the lower end of the rotating shaft 5. The first pulley 73 and the second pulley 75 are connected and driven by the transmission belt 74. The drive motor 72 drives the first pulley 73 to rotate. The rotation of the first pulley 73 drives the second pulley 75 to rotate through the transmission belt 74. The rotation of the second pulley 75 drives the rotating shaft 5 to rotate synchronously.

[0038] In this embodiment, see Figure 4 An air pump 8 is installed on the bracket 1. The air pump 8 is a commercially available device. The air pump 8 is connected to the inflation port 24 through a gas delivery pipe 81. A gas regulating valve 82 is installed on the gas delivery pipe 81 to regulate the opening and closing of the gas delivery pipe 81 and the gas flow rate. The gas regulating valve 82 can read the air pressure inside the airbag.

[0039] In this embodiment, the internal air pressure is measured by installing a pressure sensor inside the tank 2.

[0040] In this embodiment, the solenoid valve 232, drive motor 72, air pump 8, and gas regulating valve 82 are all commercially available products and are controlled by a controller.

[0041] As can be seen from the above technical solution, during use, the air inlet 22 on the upper side wall of the tank 2 is sealed and connected to the pressure-stabilized gas outlet of the dehydrogenation reactor through an air inlet connector and an air inlet pipe. Then, high-pressure gas is supplied to the gas delivery pipe 81 through the air pump 8. The high-pressure gas enters the corrugated cylinder 3 through the inflation port 24 and then inflates the air bag 43, so that the air bag 43 reaches the moving air pressure, forming a buffer with the reactor gas inside the tank 2, ensuring the stability of the gas pressure inside the dehydrogenation reactor. When the air pump fails to work, the first pulley 73 is driven to rotate by the drive motor 72. The rotation of the first pulley 73 drives the second pulley 75 to rotate through the transmission belt 74. The rotation of the second pulley 75 drives the rotating shaft 5 to rotate clockwise synchronously, driving the guide tube 6 to move downward. The guide tube 6 drives the sealing plate 4 to move downward, so that the height of the regulating corrugated cylinder 3 is reduced, compressing the internal space of the corrugated cylinder 3, and increasing the gas pressure inside the air bag 43 to the specified range.

[0042] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0043] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A pressure stabilizing device for a dehydrogenation reactor comprising a support (1), characterized in that: The bracket (1) is provided with a tank body (2), the inner bottom of the tank body (2) is provided with a corrugated cylinder (3), the upper end of the corrugated cylinder (3) is provided with a sealing plate (4), the lower end is sealingly connected and fixed with the bottom plate (21) of the tank body (2), the peripheral sidewall of the sealing plate (4) is slidingly matched with the inner wall of the tank body (2), the upper surface of the sealing plate (4) is provided with an inlet and outlet port (41), the inlet and outlet port (41) is connected with one end of a gas supply pipe (42), the other end of the gas supply pipe (42) is fixedly connected with a gas bag (43), the upper end sidewall of the tank body (2) is provided with an air inlet (22), the bottom of the tank body (2) is provided with an air outlet (23) and an inflation port (24), the bottom plate (21) of the tank body (2) is provided with a mounting hole (25), the mounting hole (25) is rotatably connected with a rotating shaft (5), the upper end of the rotating shaft (5) extends into the guiding pipe (6) connected with the bottom of the sealing plate (4) in the corrugated cylinder (3), the lower end of the rotating shaft (5) is provided with a driving mechanism (7) for driving the rotation thereof.

2. The pressure stabilizing device for a dehydrogenation reactor according to claim 1, wherein The air outlet (23) is connected with a first exhaust pipe (231), and the first exhaust pipe (231) is provided with an electromagnetic valve (232).

3. The pressure stabilizing device for a dehydrogenation reactor according to claim 1, wherein The inner wall of the mounting hole (25) is provided with a second annular groove (251) in the circumferential direction, and the second annular groove (251) is provided with a second sealing ring (252).

4. The pressure stabilizing device for a dehydrogenation reactor according to claim 3, wherein A plurality of guide wheels (46) are arranged around the top of the sealing plate (4), and the roller (461) part of each guide wheel (46) is embedded in the vertically sliding groove (462) arranged correspondingly on the sidewall of the tank body (2) for guiding cooperation.

5. The pressure stabilizing device for a dehydrogenation reactor according to claim 1, wherein The driving mechanism (7) comprises a motor support (71), a driving motor (72), a first pulley (73), a transmission belt (74), and a second pulley (75), the motor support (71) is fixedly installed on the bracket (1), the driving motor (72) is arranged on the motor support (71), the first pulley (73) is coaxially fixed on the output shaft of the driving motor (72), the second pulley (75) is coaxially arranged on the lower end of the rotating shaft (5), and the first pulley (73) and the second pulley (75) are connected and transmitted by the transmission belt (74).

6. The pressure stabilizing device for a dehydrogenation reactor according to claim 1, wherein The bracket (1) is provided with a gas pump (8), the gas pump (8) is connected with the inflation port (24) through a gas conveying pipe (81), and the gas conveying pipe (81) is provided with a gas regulating valve (82).

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