CN110142007B - Molten salt circulation structure in maleic anhydride preparation reactor - Google Patents

Molten salt circulation structure in maleic anhydride preparation reactor Download PDF

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CN110142007B
CN110142007B CN201910421949.1A CN201910421949A CN110142007B CN 110142007 B CN110142007 B CN 110142007B CN 201910421949 A CN201910421949 A CN 201910421949A CN 110142007 B CN110142007 B CN 110142007B
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fixed
molten salt
shell
box body
box
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CN110142007A (en
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许新华
徐东红
余淑惠
李进喜
郑垚
王强
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Ningbo Zhetie Jiangning Chemical Co ltd
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Ningbo Zhetie Jiangning Chemical Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0006—Controlling or regulating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053—Details of the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B01J19/2415—Tubular reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/001—Controlling catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
    • B01J8/06—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds in tube reactors; the solid particles being arranged in tubes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D307/60—Two oxygen atoms, e.g. succinic anhydride

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

The invention discloses a molten salt circulating structure in a maleic anhydride preparation reactor, which comprises a boiler, a molten salt pump and a reactor, wherein the output end of the boiler is connected with the input end of the molten salt pump through a pipeline, the output end of the molten salt pump is connected with a cooling liquid inlet of the reactor through a pipeline, a cooling liquid outlet of the reactor is connected with the input end of the boiler through a pipeline, a monitoring mechanism is arranged on the pipeline between the cooling liquid outlet of the reactor and the boiler, the molten salt circulating structure in the maleic anhydride preparation reactor can detect whether the reactor leaks or not through the monitoring mechanism, and when the leakage is detected, an alarm can be given out to remind a worker in time, so that the molten salt is prevented from permeating into a pipeline inside the reactor, and a good protection effect on a catalyst is achieved.

Description

Molten salt circulation structure in maleic anhydride preparation reactor
Technical Field
The invention relates to the technical field of maleic anhydride preparation, in particular to a molten salt circulation structure in a maleic anhydride preparation reactor.
Background
Maleic anhydride, also known as maleic anhydride, 2, 5-furandione, and the like. Orthorhombic colorless needle-like or plate-like crystals. Has strong pungent smell, is soluble in ethanol, diethyl ether and acetone, and is insoluble in petroleum ether and carbon tetrachloride. Reacting with hot water to obtain maleic acid. The method is mainly used for producing unsaturated polyester resin, alkyd resin, malathion pesticide, 4049 high-efficiency low-toxicity pesticide and long-acting iodoamine. Also is a comonomer of paint, maleic rosin, polymaleic anhydride and maleic anhydride-styrene copolymer, and also is an organic chemical raw material for producing printing ink auxiliary agents, papermaking auxiliary agents, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran and the like.
In the reaction part of the maleic anhydride process, air is compressed, mixed with n-butane and fed into a tubular catalytic reactor. The heat of reaction is removed by cooling the reactor tubes with heat transfer salts. The circulating salt is cooled in an external boiler, in which high-pressure steam is generated. The reactor outlet gas, containing maleic anhydride, is cooled in a heat exchanger and additional high pressure steam is generated. This gaseous material is then further cooled in a switched cooler which recovers heat by preheating the boiler feed water. And the cooled gas material enters the bottom of the absorption tower.
When the maleic anhydride is prepared, the used reactor is a small tubular reactor, when the reactor is used for a long time, the internal pipe joint of the reactor is likely to leak, and because the pipeline is filled with the catalyst, the fused salt enters the pipeline to cause the failure of the promoter, so that the maleic anhydride cannot be reasonably produced, and a large amount of economic loss is caused. For this reason, we propose a molten salt circulation structure in the maleic anhydride preparation reactor.
Disclosure of Invention
The invention aims to provide a molten salt circulating structure in a maleic anhydride preparation reactor, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the molten salt circulating structure in the maleic anhydride preparation reactor comprises a boiler, a molten salt pump and a reactor, wherein the output end of the boiler is connected with the input end of the molten salt pump through a pipeline, the output end of the molten salt pump is connected with a cooling liquid inlet of the reactor through a pipeline, a cooling liquid outlet of the reactor is connected with the input end of the boiler through a pipeline, and a monitoring mechanism is arranged on the pipeline between the cooling liquid outlet of the reactor and the boiler.
Preferably, monitoring mechanism includes first box, second box, air exhaust device, heat sink, induction system and controlling means, the both ends of first box are fixed intercommunication respectively has inlet pipe and discharging pipe, the inlet pipe passes through the pipeline and is connected with the coolant liquid exit linkage of reactor, the discharging pipe passes through the pipeline and is connected with the input of boiler, air exhaust device and second box are all fixed at the top of first box, and air exhaust device input and output communicate with the inside of first box and second box respectively, the output of heat sink is located the inside bottom of second box, induction system fixes the top at the second box, controlling means fixes the outside at first box, controlling means respectively with air exhaust device, heat sink and induction system electric connection.
Preferably, air exhaust device includes aspiration pump, exhaust tube, air supply pipe and blast pipe, the aspiration pump is fixed at the top of first box, and the input of aspiration pump passes through the inside intercommunication of exhaust tube and first box, the one end of air supply pipe is connected with the output of aspiration pump, and one side that the other end passed the second box is fixed with the inner wall of second box opposite side, the blast pipe is L type structure, and the top of blast pipe and the fixed intercommunication of air supply pipe, and the bottom extends to the inside bottom of second box.
Preferably, the exhaust pipe is provided with a plurality of exhaust pipes, and the plurality of exhaust pipes are symmetrically distributed on the outer side of the air supply pipe.
Preferably, the cooling device comprises a low-temperature constant-temperature tank and a cooling pipe, the cooling pipe is fixed at the bottom inside the second box body, two ends of the cooling pipe are respectively connected with an external circulation pipeline of the low-temperature constant-temperature tank, and the cooling pipe is of an S-shaped structure.
Preferably, induction system includes drying assembly, combustible gas detector, sealed shell, back flow and fixed subassembly, drying assembly fixes the middle part at second box top, sealed shell is located drying assembly's top, and sealed shell is fixed through the top of fixed subassembly with the second box, combustible gas detector fixes on the inner wall at sealed shell top, sealed shell passes through the inside intercommunication of back flow with first box.
Preferably, the drying component comprises an installation shell, a drying shell, a supporting block and a limiting block, an opening is formed in the top of the second box body, the outer wall of the installation shell is matched with the opening and fixed with the inner wall of the opening, the supporting block is fixed to the bottom inside the installation shell, a groove is formed in the top of the supporting block, the limiting block is inserted into the groove, the bottom of the drying shell is fixed with the limiting block, the drying shell is in sliding fit with the inner wall of the installation shell, a plurality of air holes are formed in the bottom of the drying shell and the bottom of the installation shell, and an adsorbent is filled in the drying shell and the inside of the installation shell.
Preferably, a handle is fixed at the middle part of the top of the drying shell.
Preferably, the fixed subassembly includes screw rod, nut, sealing washer and annular fixed plate, the sealed shell is located the open-ended directly over, the fixed outside that cup joints in sealed shell bottom of annular fixed plate, the angle such as open-ended outside is equipped with a plurality of screw rods, the bottom of screw rod is fixed with the top of second box, angle such as annular fixed plate is equipped with a plurality of fixed orificess, the fixed orifices is pegged graft in the outside of screw rod, nut and screw rod threaded connection, and the bottom of screw rod offsets with annular fixed plate, annular fixed plate's bottom offsets with the second box through the sealing washer.
Preferably, the control device comprises a controller and an alarm, the combustible gas detector is electrically connected with the controller, and the controller is electrically connected with the air pump and the alarm.
Compared with the prior art, the invention has the beneficial effects that:
the reactor leakage monitoring device can detect whether the reactor leaks or not through the monitoring mechanism, and can give an alarm to remind workers in time after the leakage is detected, so that molten salt is prevented from permeating into a pipeline inside the reactor, and a good protection effect is achieved on a catalyst.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the monitoring mechanism of the present invention;
FIG. 3 is a schematic view of the structure of the air extractor of the present invention;
FIG. 4 is a schematic view of an induction device according to the present invention;
FIG. 5 is a schematic view of the drying assembly of the present invention;
FIG. 6 is a schematic view of the support block structure of the present invention;
fig. 7 is an enlarged view of the area a in fig. 4.
In the figure: 1-a boiler; 2-molten salt pump; 3-a reactor; 4-a monitoring mechanism; 5-a first box body; 6-a second box body; 7-air extraction device; 8, cooling the device; 9-a sensing device; 10-a control device; 11-an air pump; 12-an extraction tube; 13-a gas supply pipe; 14-an exhaust pipe; 15-a low-temperature constant-temperature tank; 16-a cooling pipe; 17-a drying assembly; 18-a sealed shell; 19-a return pipe; 20-a stationary component; 21-mounting the housing; 22-drying the shell; 23-a support block; 24-a stopper; 25-a handle; 26-screw rod; 27-a screw cap; 28-sealing ring; 29-annular fixed plate; 30-a combustible gas detector; 31-feed pipe; 32-a discharge pipe; 33-a groove; 34-a vent hole; 35-opening; 36-fixing hole.
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. 1-7, the present invention provides the following technical solutions: molten salt circulating structure in maleic anhydride preparation reactor, including boiler 1, molten salt pump 2 and reactor 3, the output of boiler 1 passes through the pipeline and is connected with the input of molten salt pump 2, the output of molten salt pump 2 passes through the coolant liquid entry linkage of pipeline and reactor 3, the coolant liquid export of reactor 3 passes through the pipeline and is connected with the input of boiler 1, be equipped with monitoring mechanism 4 on the pipeline between the coolant liquid export of reactor 3 and the boiler 1, can detect reactor 3 whether leak through monitoring mechanism 4, leak the alarm and can send when detecting the back.
Monitoring mechanism 4 includes first box 5, second box 6, air exhaust device 7 and induction system 9, the both ends of first box 5 are fixed intercommunication respectively has inlet pipe 31 and discharging pipe 32, inlet pipe 31 passes through the pipeline and is connected with the coolant liquid exit linkage of reactor 3, discharging pipe 32 passes through the pipeline and is connected with the input of boiler 1, and first box 5 is connected in the circulating line of fused salt.
The air extractor 7 and the second box body 6 are both fixed on the top of the first box body 5, the input end and the output end of the air extractor 7 are respectively communicated with the inside of the first box body 5 and the second box body 6, the air extracting device 7 comprises an air extracting pump 11, an air extracting pipe 12, an air supplying pipe 13 and an air exhausting pipe 14, the air extracting pump 11 is fixed at the top of the first box body 5, the input end of the air pump 11 is communicated with the inside of the first box body 5 through an air pumping pipe 12, one end of the air supply pipe 13 is connected with the output end of the air pump 11, the other end of the air supply pipe passes through one side of the second box body 6 and is fixed with the inner wall of the other side of the second box body 6, the exhaust pipe 14 is of an L-shaped structure, and the top end of the exhaust pipe 14 is fixedly communicated with the air supply pipe 13, and the bottom end extends to the bottom inside the second box 6, and the air pump 11 can send the air inside the first box 5 into the second box 6 through the exhaust pipe 12, the air supply pipe 13 and the exhaust pipe 14.
The exhaust pipes 14 are provided in plurality, and the exhaust pipes 14 are symmetrically distributed outside the gas supply pipe 13, so that the gas is distributed more uniformly inside the second box 6.
Induction system 9 includes combustible gas detector 30, sealed shell 18, back flow 19 and fixed subassembly 20, dry subassembly 17 is fixed at the middle part at second box 6 top, sealed shell 18 is located dry subassembly 17's top, and sealed shell 18 is fixed through the top of fixed subassembly 20 with second box 6, combustible gas detector 30 is fixed on the inner wall at sealed shell 18 top, sealed shell 18 passes through the inside intercommunication of back flow 19 with first box 5, can detect the inside gas of second box 6 through combustible gas detector 30, and the gas after the detection passes through back flow 19 and gets into in the first box 5 to the circulation that has realized the air current detects.
Monitoring mechanism 4 still includes controlling means 10, controlling means 10 includes controller and siren, combustible gas detector 30 electric connection controller, controller electric connection aspiration pump 11 and siren, when reactor 3 takes place to reveal, combustible gas detector 30 can detect that 6 insides of second box contain combustible gas, feeds back detection signal to the controller, and rethread controller control siren sends out the police dispatch newspaper and reminds the staff.
Monitoring mechanism 4 still includes heat sink 8, heat sink 8 includes cryostat 15 and cooling tube 16, cooling tube 16 fixes in the inside bottom of second box 6, and cooling tube 16 ' S both ends respectively with cryostat 15 ' S extrinsic cycle tube coupling, at the bottom filling water of second box 6, in the bottom of blast pipe 14 inserted the water, cool down the gas that gets into second box 6 inside through the water, prevent that gas temperature from too high causing the damage to combustible gas detector 30, be connected with cooling tube 16 through cryostat 15 ' S extrinsic cycle pipeline, make cooling tube 16 can cool down the water of second box 6 bottom, improved the cooling effect of water to gas, cooling tube 16 is S type structure, has improved the cooling effect of cooling tube 16 to the water.
The sensing device 9 further comprises a drying component 17, the drying component 17 comprises an installation shell 21, a drying shell 22, a supporting block 23 and a limiting block 24, an opening 35 is formed in the top of the second box body 6, the outer wall of the installation shell 21 is matched with the opening 35 and fixed with the inner wall of the opening 35, the supporting block 23 is fixed at the bottom inside the installation shell 21, a groove 33 is formed in the top of the supporting block 23, the limiting block 24 is inserted into the groove 33, the bottom of the drying shell 22 is fixed with the limiting block 24, the drying shell 22 is in sliding fit with the inner wall of the installation shell 21, a plurality of vent holes 34 are formed in the bottoms of the drying shell 22 and the installation shell 21, adsorbents are filled in the drying shell 22 and the installation shell 21, gas inside the second box body 6 can be dried through the adsorbents, and the combustible gas detector 30 is prevented from being damaged by excessive water vapor, the adsorbent can be replaced periodically.
A handle 25 is fixed at the middle of the top of the drying shell 22, so that the drying shell 22 and the mounting shell 21 can be separated conveniently, and the adsorbent can be replaced conveniently.
The sensing device 9 further comprises a fixing assembly 20, the fixing assembly 20 comprises a screw 26, a nut 27, a sealing ring 28 and an annular fixing plate 29, the sealing shell 18 is positioned right above the opening 35, the annular fixing plate 29 is fixedly sleeved on the outer side of the bottom of the sealing shell 18, a plurality of screws 26 are arranged on the outer side of the opening 35 at equal angles, the bottom ends of the screws 26 are fixed with the top of the second box 6, a plurality of fixing holes 36 are arranged on the annular fixing plate 29 at equal angles, the fixing holes 36 are inserted outside the screw 26, the screw cap 27 is in threaded connection with the screw 26, and the bottom of the screw 26 is abutted against an annular fixed plate 29, the bottom of the annular fixed plate 29 is abutted against the second box body 6 through a sealing ring 28, the sealing shell 18 is fixed by the fixing component 20, and meanwhile, the sealing performance of the connection between the sealing shell 18 and the second box body 6 is ensured.
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 (8)

1. Molten salt circulation structure in maleic anhydride preparation reactor, including boiler (1), molten salt pump (2) and reactor (3), its characterized in that: the output of boiler (1) passes through the pipeline and is connected with the input of molten salt pump (2), the output of molten salt pump (2) passes through the coolant liquid entry linkage of pipeline and reactor (3), the coolant liquid export of reactor (3) passes through the pipeline and is connected with the input of boiler (1), be equipped with monitoring mechanism (4) on the pipeline between the coolant liquid export of reactor (3) and boiler (1), monitoring mechanism (4) include first box (5), second box (6), air exhaust device (7), heat sink (8), induction system (9) and controlling means (10), the both ends of first box (5) are fixed the intercommunication respectively and have inlet pipe (31) and discharging pipe (32), inlet pipe (31) pass through the pipeline and are connected with the coolant liquid export of reactor (3), discharging pipe (32) pass through the pipeline and are connected with the input of boiler (1), the gas extraction device (7) and the second box body (6) are fixed at the top of the first box body (5), the input end and the output end of the gas extraction device (7) are respectively communicated with the inside of the first box body (5) and the inside of the second box body (6), the output end of the cooling device (8) is positioned at the bottom of the inside of the second box body (6), the induction device (9) is fixed at the top of the second box body (6), the control device (10) is fixed at the outer side of the first box body (5), the control device (10) is respectively electrically connected with the gas extraction device (7), the cooling device (8) and the induction device (9), the induction device (9) comprises a drying component (17), a combustible gas detector (30), a sealing shell (18), a backflow pipe (19) and a fixing component (20), the drying component (17) is fixed at the middle part of the top of the second box body (6), the sealing shell (18) is located at the top of the drying assembly (17), the sealing shell (18) is fixed to the top of the second box body (6) through a fixing assembly (20), the combustible gas detector (30) is fixed to the inner wall of the top of the sealing shell (18), and the sealing shell (18) is communicated with the interior of the first box body (5) through a return pipe (19).
2. The molten salt circulation structure in a maleic anhydride production reactor according to claim 1, characterized in that: air exhaust device (7) are including aspiration pump (11), exhaust tube (12), air supply pipe (13) and blast pipe (14), the top at first box (5) is fixed in aspiration pump (11), and the inside intercommunication of exhaust tube (12) and first box (5) is passed through to the input of aspiration pump (11), the one end and the output of aspiration pump (11) of air supply pipe (13) are connected, and the other end passes one side of second box (6) and the inner wall of second box (6) opposite side is fixed, blast pipe (14) are L type structure, and the top and the air supply pipe (13) of blast pipe (14) are fixed the intercommunication, and the bottom extends to the inside bottom of second box (6).
3. The molten salt circulation structure in the maleic anhydride production reactor according to claim 2, characterized in that: the exhaust pipes (14) are arranged in a plurality, and the exhaust pipes (14) are symmetrically distributed on the outer side of the air supply pipe (13).
4. The molten salt circulation structure in the maleic anhydride production reactor according to claim 3, characterized in that: the cooling device (8) comprises a low-temperature constant-temperature tank (15) and a cooling pipe (16), the cooling pipe (16) is fixed at the bottom inside the second box body (6), the two ends of the cooling pipe (16) are respectively connected with an outer circulation pipeline of the low-temperature constant-temperature tank (15), and the cooling pipe (16) is of an S-shaped structure.
5. The molten salt circulation structure in a maleic anhydride production reactor according to claim 1, characterized in that: the drying component (17) comprises an installation shell (21), a drying shell (22), a supporting block (23) and a limiting block (24), an opening (35) is formed in the top of the second box body (6), the outer wall of the installation shell (21) is matched with the opening (35) and fixed with the inner wall of the opening (35), the supporting block (23) is fixed to the bottom of the interior of the installation shell (21), a groove (33) is formed in the top of the supporting block (23), the limiting block (24) is inserted into the groove (33), the bottom of the drying shell (22) is fixed to the limiting block (24), the drying shell (22) is in sliding fit with the inner wall of the installation shell (21), a plurality of vent holes (34) are formed in the bottoms of the drying shell (22) and the installation shell (21), and an adsorbent is filled in the drying shell (22) and the installation shell (21).
6. The molten salt circulation structure in a maleic anhydride production reactor according to claim 5, characterized in that: a handle (25) is fixed at the middle part of the top of the drying shell (22).
7. The molten salt circulation structure in a maleic anhydride production reactor according to claim 6, characterized in that: the fixed component (20) comprises a screw rod (26), a screw cap (27), a sealing ring (28) and an annular fixing plate (29), the sealing shell (18) is located right above the opening (35), the annular fixing plate (29) is fixedly sleeved on the outer side of the bottom of the sealing shell (18), a plurality of screw rods (26) are arranged on the outer side of the opening (35) at equal angles, the bottom end of each screw rod (26) is fixed to the top of the second box body (6), a plurality of fixing holes (36) are arranged on the annular fixing plate (29) at equal angles, the fixing holes (36) are connected to the outer side of each screw rod (26) in an inserting mode, the screw cap (27) is in threaded connection with the screw rods (26), the bottom of each screw rod (26) abuts against the annular fixing plate (29), and the bottom of the annular fixing plate (29) abuts against the second box body (6) through the sealing ring (28).
8. The molten salt circulation structure in a maleic anhydride production reactor according to claim 7, characterized in that: the control device (10) comprises a controller and an alarm, the combustible gas detector (30) is electrically connected with the controller, and the controller is electrically connected with the air pump (11) and the alarm.
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CN207976445U (en) * 2018-02-26 2018-10-16 郑州跃创电子科技有限公司 A kind of tobacco baking room gas warning system
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