CN111468043B

CN111468043B - Fixed bed reactor with bed temperature uniformly distributed

Info

Publication number: CN111468043B
Application number: CN202010174896.0A
Authority: CN
Inventors: 周强; 夏林兵; 钟骏良; 涂德
Original assignee: Ningbo Juhua Chemical Technology Co ltd
Current assignee: Ningbo Juhua Chemical Technology Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2022-04-08
Anticipated expiration: 2040-03-13
Also published as: CN111468043A

Abstract

The invention discloses a fixed bed reactor with uniformly distributed bed temperature, which comprises a reactor body, wherein a plurality of reaction tubes are arranged in the reactor body, a feed inlet and a discharge outlet are respectively formed in the top and the bottom of the reactor body, two baffles are fixed in the reactor body, the reactor body is divided into three reaction chambers by the two baffles, a liquid inlet and a liquid outlet are respectively arranged on two sides of each reaction chamber, and a temperature uniform adjusting device for ensuring uniform internal temperature is arranged in each reaction chamber. Thereby realizing the adjustment of the temperature of different areas in the reaction chamber.

Description

Fixed bed reactor with bed temperature uniformly distributed

Technical Field

The invention relates to the technical field of fixed bed reactors, in particular to a fixed bed reactor with bed temperature uniformly distributed.

Background

The fixed bed reactor is widely applied to the chemical industry and the petroleum industry, reaction processes such as methanol to gasoline, methanol to propylene, steam reforming, methanol synthesis, Fischer-Tropsch synthesis and the like are generally carried out in a fixed bed, the processes are all strong heat release processes, the control of the reaction temperature is the key for maintaining high reaction conversion rate and selectivity, and heat generated in the reaction process needs to be removed from a bed layer in time, so that the type selection, design and monitoring of the reactor are very important for the processes.

The shell and tube fixed bed reactor is connected in parallel through a plurality of reactors, a catalyst is filled in the tube for reaction, a cooling medium flows outside the tube for heat transfer, and the shell and tube fixed bed reactor has larger heat transfer area compared with a common fixed bed reactor and is more suitable for the reaction process with large heat release. However, some chemical reactions with large exotherms are still prone to temperature runaway under inappropriate process conditions, with the consequences often being catastrophic.

When the partial reaction has severe heat release, the heat export is limited by the heat transfer of the reaction tube, so that a large temperature gradient is formed in the axial direction and the radial direction of the reaction tube, and the catalyst is likely to be coked due to local overheating, side reactions are increased, and the utilization rate of the catalyst is reduced. For example, in the fischer-tropsch synthesis reaction using a fixed bed reactor, the axial and radial temperature differences of the reaction tube, which are generated by the exothermic reaction, reach 20 ℃ and 10 ℃ respectively, so that part of the catalyst is in a state of high temperature and severe side reactions, and part of the catalyst is in a state of low temperature and incapable of performing normal performance, thereby causing the phenomena of partial insufficient reaction and excessive side reactions of the catalyst.

Disclosure of Invention

The invention aims to provide a fixed bed reactor which ensures that the temperature of each layer of a bed layer is uniform and avoids side reaction of a catalyst, so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a bed temperature evenly distributed's fixed bed reactor, includes the reactor body, this internal installation of reactor and a plurality of reaction tube, and reactor body top and bottom open respectively has feed inlet and discharge gate, this internal two baffles of being fixed with of reactor, and fall into three reaction chamber with the reactor body through two baffles, inlet and liquid outlet are installed respectively to reaction chamber both sides, and install the even adjusting device of temperature that guarantees that inside temperature is even in the reaction chamber, through falling into three reaction chamber to independently emit into and the coolant liquid of discharging, can effectual reduction reaction tube axial difference in temperature, utilize the even adjusting device of temperature simultaneously, can effectually detect out different regional temperatures in the reaction chamber, and the effectual regulation of making.

Preferably, temperature uniformity adjusting device is equipped with two, and corresponds and install in inlet and liquid outlet position department, temperature uniformity adjusting device includes the C template, the track board is fixed at C template top, and installs the removal subassembly in the track board outside, the inside intercommunication of inlet or liquid outlet has the infusion hose, and infusion hose one end with remove the subassembly and be connected, C template inboard is fixed with the lift piece, through the lift piece with remove the cooperation motion of subassembly for remove the subassembly and can carry out temperature detection and regulation in reaction chamber each region of co-altitude not.

Preferably, the movable assembly comprises L-shaped clamping plates, a plurality of clamping teeth are fixed to the top of each rail plate in an evenly distributed mode, sliding grooves are formed in the two sides of each rail plate, the L-shaped clamping plates are provided with two sliding grooves in sliding connection and two driving pieces are installed in the L-shaped clamping plates, temperature sensors used for detecting the temperature in the reaction chamber are fixed to the outer sides of the L-shaped clamping plates, connecting folding plates are fixed to the outer sides of the L-shaped clamping plates and fixed to one end of the infusion hose, and the movable assembly can move along the tops of the rail plates through rotation of driving motors in the movable assembly, so that the temperature in the reaction chamber can be detected evenly.

Preferably, the inner side of the connecting folded plate is in sliding connection with the inner wall of the bottom of the C-shaped plate, so that the connecting folded plate can move more stably.

Preferably, the driving piece includes driving motor, pivot and drive gear, drive gear rotates through pivot and two L type cardboard inner walls and is connected to with a plurality of latch meshing, the driving motor output is fixed with pivot one end, and the driving motor outside is fixed with the backup pad to it is fixed with L type cardboard outside through the backup pad, makes temperature sensor can effectively move along the C template through the driving piece.

Preferably, the lifting piece includes elevator motor, elevator motor installs on baffle or reactor body bottom inner wall, and the elevator motor output is fixed with the threaded rod, the threaded rod is kept away from elevator motor one end and is passed through on bearing and baffle or reactor body top inner wall, and threaded rod outside threaded connection has the lifter plate to it is inboard fixed with the C template through the lifter plate, drive the C template through the lifter piece and go up and down, thereby effectually detect and adjust the reaction chamber interior temperature.

Preferably, the inside both ends of reactor body all are fixed with the worker's board, C template both ends all are fixed with the sliding plate, and through sliding plate and worker's board one side sliding connection, through worker's board and two sliding plate sliding connection, make the C template lift more stable.

Preferably, a supporting tube is fixed at the bottom of the connecting folded plate, the infusion hose is communicated with the supporting tube, and the tail end of the infusion hose can accurately discharge or suck liquid corresponding to a region with higher temperature through the supporting tube.

Compared with the prior art, the invention has the beneficial effects that:

the reactor body is divided into three independent reaction chambers by the two baffles, so that the temperature difference of the axial temperature of the reaction pipe is effectively reduced, meanwhile, the temperature of different areas in the reaction chambers is effectively detected by utilizing the two temperature uniform adjusting devices in the reaction chambers, and the preferential cooling treatment of the high-temperature areas is realized by changing the input position and the discharge position of the cooling liquid, so that the temperature of different areas in the reaction chambers is adjusted.

Drawings

FIG. 1 is a schematic view of the present invention in a partial cross-sectional view;

FIG. 2 is a schematic top sectional view of the temperature-uniforming adjusting device according to the present invention;

FIG. 3 is a schematic structural diagram of the temperature-uniforming adjusting device according to the present invention;

FIG. 4 is a schematic view of the lifter of the present invention;

FIG. 5 is a side cross-sectional structural view of the moving assembly of the present invention;

FIG. 6 is an enlarged view taken at A in FIG. 2;

FIG. 7 is an enlarged view of FIG. 3 at B;

fig. 8 is an enlarged view of fig. 5 at C.

In the figure: 1-a reactor body; 2-a reaction tube; 3-a feed inlet; 4-a discharge hole; 5-a baffle plate; 6-a reaction chamber; 7-liquid inlet; 8-a liquid outlet; 9-temperature uniform adjusting device; a 10-C template; 11-a track slab; 12-a moving assembly; 13-infusion hose; 14-a lifting member; 15-L-shaped clamping plates; 16-latch; 17-a sliding groove; 18-a drive member; 19-a temperature sensor; 20-connecting flaps; 21-a drive motor; 22-a rotating shaft; 23-a drive gear; 24-a support plate; 25-a lifting motor; 26-a threaded rod; 27-a lifter plate; 28-a tooling plate; 29-a sliding plate; and 30-supporting the tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, a fixed bed reactor with uniformly distributed bed temperature in the figure includes a reactor body 1, a plurality of reaction tubes 2 are installed in the reactor body 1, a feed inlet 3 and a discharge outlet 4 are respectively opened at the top and the bottom of the reactor body 1, a catalyst is poured into the reaction tubes 2 through the feed inlet 3, and the catalyst is discharged through the discharge outlet 4;

reactor body 1 internal fixation has two baffles 5, and falls into three reaction chamber 6 with reactor body 1 through two baffles 5, and three reaction chamber 6 independently cools down, inlet 7 and liquid outlet 8 are installed respectively to 6 both sides of reaction chamber, and leading-in and the discharge of coolant liquid are cooled down through inlet 7 and liquid outlet 8, and install the even adjusting device 9 of temperature of guaranteeing that inside temperature is even in reaction chamber 6.

Wherein, the even adjusting device of temperature 9 is equipped with two, and corresponds and install in

inlet

7 and 8 position departments of liquid outlet, and two even adjusting device of temperature 9 correspond the leading-in and the discharge of cooling water respectively, even adjusting device of temperature 9 includes C template 10, track board 11 is fixed at C template 10 top, and installs in the track board 11 outside and remove subassembly 12,

inlet

7 or 8 inside intercommunications of liquid outlet have infusion hose 13, and infusion hose 13 one end is connected with removal subassembly 12, C template 10 inboard is fixed with lifter 14.

The moving assembly 12 comprises an L-shaped clamping plate 15, a plurality of clamping teeth 16 are uniformly distributed and fixed on the top of the track plate 11, two sliding grooves 17 are arranged on both sides of the track plate 11, two L-shaped clamping plates 15 are arranged and are respectively connected with the two sliding grooves 17 in a sliding manner, driving pieces 18 are arranged in the two L-shaped clamping plates 15, a temperature sensor 19 for detecting the temperature in the reaction chamber 6 is fixed on the outer side of the L-shaped clamping plate 15, a connecting folded plate 20 is fixed on the outer side of the L-shaped clamping plate 15, and the connecting folded plate 20 is fixed with one end of the transfusion hose 13, and the two L-shaped clamping plates 15 are driven by the driving piece 18 to move in the sliding groove 17, thereby realizing that the temperature sensor 19 is driven to move along the C-shaped plate 10, the detection range of the temperature sensor 19 is enlarged, the supporting tube 30 is fixed at the bottom of the connecting folded plate 20, the transfusion hose 13 is communicated with the supporting tube 30, the tail end of the transfusion hose 13 can directly discharge and suck the high-temperature area through the supporting pipe 30;

wherein, driving piece 18 includes driving motor 21, pivot 22 and drive gear 23, drive gear 23 rotates through pivot 22 and two L type cardboard 15 inner walls and is connected to with a plurality of latch 16 meshing, driving motor 21 output is fixed with pivot 22 one end, and the driving motor 21 outside is fixed with backup pad 24, and is fixed in the outside with L type cardboard 15 through backup pad 24, rotates through driving motor 21, drives drive gear 23 and a plurality of latch 16 meshing, thereby makes temperature sensor 19 remove along C type board 10.

Lifting member 14 includes elevator motor 25, elevator motor 25 installs on baffle 5 or 1 bottom inner wall of reactor body, and elevator motor 25 output end is fixed with threaded rod 26, elevator motor 25 one end is kept away from to threaded rod 26 on passing through bearing and baffle 5 or 1 top inner wall of reactor body, and threaded rod 26 outside threaded connection has lifter plate 27, and it is inboard fixed with C template 10 through lifter plate 27, rotate through elevator motor 25, make lifter plate 27 remove on threaded rod 26, thereby drive C template 10 and go up and down, and remove subassembly 12 through the cooperation, make temperature sensor 19 can detect each regional temperature in reaction chamber 6, carry out effectual regulation to the high temperature region simultaneously.

In addition, both ends of the interior of the reactor body 1 are fixed with the tool plates 28, both ends of the C-shaped plate 10 are fixed with the sliding plates 29, and the sliding plates 29 are slidably connected with one side of the tool plates 28, and the sliding plates 29 are slidably connected with the tool plates 28, so that the C-shaped plate 10 can be lifted more smoothly.

In the scheme, when the temperature of each bed layer of the reactor body 1 is uniformly controlled, the lifting motor 25 in the lifting part 14 rotates forwards and backwards to drive the lifting plate 27 to move up and down circularly, so that the C-shaped plate moves on the threaded rod 26 of the reactor 10, meanwhile, the driving motor 21 in the driving part 18 rotates to drive the driving gear 23 to rotate, so that the temperature sensor 19 can move along the C-shaped plate 10, the lifting part 14 and the driving part 18 are used cooperatively, so that the temperature sensor 19 can detect the temperatures of different areas of each bed layer in the reaction chamber 6, when a high-temperature area is detected, the driving motor 21 and the lifting motor 25 stop rotating, and the cooling liquid is discharged through the liquid inlet 7, because the supporting pipe 30 is aligned with the high-temperature area, the cooling liquid preferentially cools the high-temperature area, and similarly, the limited discharge of the high-temperature liquid in the high-temperature area by the liquid outlet 8 can also be utilized, thereby leading the high-temperature area to be preferentially cooled, reducing the axial temperature difference of the reaction tube 2 and leading each bed layer of the reactor to realize temperature control.

In the scheme, the type of the lifting motor 25 is preferably Y80M1-2, the type of the driving motor 21 is preferably Y80M2-2, the type of the temperature sensor 19 is preferably EL-P202, a motor operation circuit is a normal and reverse rotation control program of a conventional motor, the circuit operation is a conventional circuit, circuits and control related to the invention are the prior art, and redundant description is not repeated herein.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a bed layer temperature evenly distributed's fixed bed reactor, includes reactor body (1), install a plurality of reaction tubes (2) in reactor body (1), and reactor body (1) top and bottom are opened feed inlet (3) and discharge gate (4) respectively, its characterized in that: the reactor comprises a reactor body (1), wherein two baffles (5) are fixed in the reactor body (1), the reactor body (1) is divided into three reaction chambers (6) through the two baffles (5), a liquid inlet (7) and a liquid outlet (8) are respectively installed on two sides of each reaction chamber (6), a temperature uniform adjusting device (9) which ensures uniform internal temperature is installed in each reaction chamber (6), the temperature uniform adjusting devices (9) are two and correspondingly installed at positions of the liquid inlet (7) and the liquid outlet (8), each temperature uniform adjusting device (9) comprises a C-shaped plate (10), a track plate (11) is fixed at the top of each C-shaped plate (10), a moving assembly (12) is installed on the outer side of each track plate (11), a transfusion hose (13) is communicated with the inner parts of the liquid inlet (7) or the liquid outlet (8), and one end of the transfusion hose (13) is connected with the moving assembly (12), the C-shaped plate (10) is fixed with a lifting part (14) on the inner side, the moving assembly (12) comprises L-shaped clamping plates (15), a plurality of clamping teeth (16) are uniformly distributed and fixed on the tops of the track plates (11), sliding grooves (17) are formed in the two sides of the track plates (11), the L-shaped clamping plates (15) are arranged in two and are respectively in sliding connection with the two sliding grooves (17), driving parts (18) are installed in the two L-shaped clamping plates (15), temperature sensors (19) used for detecting the temperature in the reaction chamber (6) are fixed on the outer sides of the L-shaped clamping plates (15), connecting folding plates (20) are fixed on the outer sides of the L-shaped clamping plates (15), the connecting folding plates (20) are fixed to one end of the infusion hose (13), each driving part (18) comprises a driving motor (21), a rotating shaft (22) and a driving gear (23), the driving gear (23) is rotatably connected with the inner walls of the two L-shaped clamping plates (15) through the rotating shaft (22), the output end of the driving motor (21) is fixed with one end of the rotating shaft (22), and a supporting plate (24) is fixed on the outer side of the driving motor (21) and is fixed with the outer side of the L-shaped clamping plate (15) through the supporting plate (24).

2. The fixed bed reactor of claim 1, wherein the bed temperature is uniformly distributed, and the fixed bed reactor comprises: the inner side of the connecting folded plate (20) is connected with the inner wall of the bottom of the C-shaped plate (10) in a sliding manner.

3. The fixed bed reactor of claim 1, wherein the bed temperature is uniformly distributed, and the fixed bed reactor comprises: lifting member (14) include elevator motor (25), elevator motor (25) are installed on baffle (5) or reactor body (1) bottom inner wall, and elevator motor (25) output end fixed threaded rod (26), elevator motor (25) one end is kept away from in threaded rod (26) and bearing setting is passed through on baffle (5) or reactor body (1) top inner wall, and threaded rod (26) outside threaded connection has lifter plate (27) to it is inboard fixed with C template (10) through lifter plate (27).

4. The fixed bed reactor of claim 1, wherein the bed temperature is uniformly distributed, and the fixed bed reactor comprises: both ends of the interior of the reactor body (1) are fixed with an industrial plate (28), both ends of the C-shaped plate (10) are fixed with sliding plates (29), and the sliding plates (29) are connected with one side of the industrial plate (28) in a sliding mode.

5. The fixed bed reactor of claim 1, wherein the bed temperature is uniformly distributed, and the fixed bed reactor comprises: a support tube (30) is fixed at the bottom of the connecting folded plate (20), and the infusion hose (13) is communicated with the support tube (30).