CN104826556B - A kind of maleic anhydride production oxidation reaction feed arrangement and its technique - Google Patents
A kind of maleic anhydride production oxidation reaction feed arrangement and its technique Download PDFInfo
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- CN104826556B CN104826556B CN201510269388.XA CN201510269388A CN104826556B CN 104826556 B CN104826556 B CN 104826556B CN 201510269388 A CN201510269388 A CN 201510269388A CN 104826556 B CN104826556 B CN 104826556B
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- butane
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- maleic anhydride
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Abstract
The present invention relates to a kind of maleic anhydride production oxidation reaction feed arrangement and its technique, the device is provided with air-blaster, air preheater, blender, fourth sky mixer tube and spray gun；The new technology that the present invention is provided has abandoned the method evaporation normal butane that butane heating is boiled again completely, and using the method for air-atomizing flash steam, technical process is simple, and equipment is simple, gasification high efficient, is easy to manipulation, it is possible to achieve precisely regulation, security performance is high；There is no butane to be vented when preheating and parking, saved raw material；The emptying for not having butane gas when stopping in emergency switches, and only cuts off the operation that liquid butane raw material is safety stop oxidator；High without evaporator pressure, the potential safety hazard such as what misoperation of valve or instrument malfunction brought builds the pressure, security performance is improved.
Description
Technical field
The present invention relates to maleic anhydride production field, specifically a kind of maleic anhydride production oxidation reaction feed arrangement and its work
Skill.
Background technology
The oxidation system of large-scale maleic anhydride unit is the core of device, and the wherein vaporization of raw material butane is uniformly mixed with air
Close, reach matched proportion density in a balanced way, the stabilization of feed gas composition is the key of the steady Effec-tive Function of reactor energy, and butane air gas are mixed
Conjunction works in explosive range, it is desirable to which technique, the security performance of equipment will hold good security, so butane vaporization and air
Mixing, tune are exactly a thing for the most important thing than precise control.
The butane vapourizing unit of existing domestic all butane method maleic anhydride devices is using the technique of SD companies of the U.S.：Butane
Evaporation is boiled again.And maleic anhydride production was just stopped before U.S.'s more than ten years, technique never has innovation.The technological process of SD is：Liquid
Butane through the laggard evaporator of flowmeter, by shell and tube reboiler heating evaporation, pressure 0.4Mpa or so, the butane after → evaporation
Gas enters superheater and is superheated to 120 DEG C → flowmeter, 1 → flowmeter 2 → open soon inlet valve or quck-opening valve emptying, and two valves one open one
Close → incoming air conduit road blender → enter reactor oxidation.
There is problems with process above：
1st, the butane after evaporating is under 0.4Mpa pressure, it is easy to condense in the duct, steam is not only used before driving
Pre-heating device, pipeline, and with overheat butane preheating pipe, be largely vented and carry out preheating pipe；2nd, stop in emergency, or normally stop
Car always closed by inlet valve, puts pipe valve opening, and the material 0.4Mpa butane in butane evaporator is constantly depressurized, evaporated, great Liang Fang
Sky, until totally, not only wasting raw material, also there is potential safety hazard；3rd, in the case of stopping in emergency, forget to close the steaming of evaporator
Vapour, the opening and closing of quck-opening valve is out of control, or produces failure without acting simultaneously, can produce the safety problem such as build the pressure；4th, controlled valve
Many, liquid level gauge and pressure and temp instrument are more, and leak point is more, and control is complicated, easily erroneous judgement, and maloperation has potential safety hazard；5th, fourth
Alkane evaporation capacity and mixed unstripped gas production plus, load shedding when it is asynchronous, it is impossible to precisely regulation in time；6th, investment is big,
Pressure pipeline material is selected in only blow-down pipe design：It is DN300, Gr5Mo steel alloy pipelines, adding ground flare etc. will consume
Provide units up to a million.
The content of the invention
Can not precisely adjust in time and waste raw material for above-mentioned existing butane method maleic anhydride device charging, to there is safety hidden
The problems such as suffering from, the present invention provides a kind of maleic anhydride production oxidation reaction feed arrangement and its technique.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of maleic anhydride production oxidation reaction feed arrangement, the device be provided with air-blaster, air preheater, blender,
Fourth sky mixer tube and spray gun；
Air-blaster is connected with air preheater, and air preheater is connected with fourth sky mixer tube top, and air enters
The pipeline for entering air-blaster is provided with air inlet valve, and the connecting line between air-blaster and air preheater is provided with
Venturi meter and air vent valve；
The spray gun is located on the wall of fourth sky mixer tube side, and its nozzle is arranged in fourth sky mixer tube, its liquid
Phase import is connected with butane water influent pipeline, and gas phase import is connected with compressed air line, and the butane water influent pipeline is provided with matter
Amount flowmeter, butane regulating valve and butane stop valve, the blender are arranged in the fourth sky mixer tube above spray gun；
The butane mass flowmenter and air Venturi meter are connected with DCS systems respectively；
The side wall of the fourth sky mixer tube is provided with barrel heating welded tube；
The barrel heating welded tube is that steam heats welded tube；
The air vent valve is air emptying Pneumatic butterfly valve；
The butane stop valve is that butane cuts off pneumatic ball valve；
The blender is helical static mixer；
The air inlet valve is air intlet electric butterfly valve；
A kind of feeding process using device as described above, this technical process is as follows：
N-butane feedstock is forced into 0.5 ~ 0.9Mpa, through mass flowmenter, into the fluid inlet of spray gun, compressed air by
Gas phase import enters spray gun, and butane liquid is knocked crushing on the target of nipple top, produces and is atomized for the first time, then by nozzle
The jet-action of the compressed air sprayed in circumferential weld produces second to be atomized, and liquid-vapor mixture in the 6mm-6 holes of top again via letting out
Pressure sprays and produces third time to be atomized；The air of air-blaster output enters fourth after being warming up to 170 DEG C through air preheater empty mixed
In clutch cylinder, uniformly mixed by blender effect is lower with the butane of atomization；Butane flow is by butane governor valve control, air stream
Amount is by air inlet valve control, the signal input DCS systems of signal and air the Venturi meter generation of butane mass flowmenter
System, controls butane and air mass flow, into reactor steady production by the production target of butane mole percent 1.6 ~ 1.8%.
Beneficial effects of the present invention：
The new technology that the present invention is provided has abandoned the method evaporation normal butane that butane heating is boiled again completely, using air-atomizing
The method of flash steam, technical process is simple, and equipment is simple, gasification high efficient, is easy to manipulation, it is possible to achieve precisely regulation, security
Can be high；There is no butane to be vented when preheating and parking, saved raw material；The emptying for not having butane gas when stopping in emergency switches, only
Cut-out liquid butane raw material is the operation of safety stop oxidator；It is high without evaporator pressure, misoperation of valve or instrument malfunction
The potential safety hazard such as build the pressure brought, security performance is improved；Equipment is simple, eliminates butane evaporator, butane superheater and its attached
The annex of the liquid level gauge of category, pressure switch, safety valve etc., reduces leak point, eliminates 2 butane gas phase mass flowmenters
With emptying regulating valve, operation is simplified；Inventory reaches precisely regulation, and reactor work is more steady, and temperature is more preferably controlled；Investment
Volume declines to a great extent, and eliminates butane evaporator, butane superheater and its annex, eliminates blow-down pipe and ground torch.
Brief description of the drawings
Fig. 1 butane air gas mixing arrangement schematic diagrames；
Fig. 2 spray gun fundamental diagrams；
Fig. 3 butane feed atomization principle-primary atomization；
Fig. 4 butane feed atomization principle-secondary-atomizing；
- three atomizations of Fig. 5 butane feed atomizations principle；
Reference：1st, air-blaster, 2, Venturi meter, 3, air preheater, 4, blender, 5, the empty mixing of fourth
Device cylinder, 6, spray gun, 7, barrel heating welded tube, 8-1, air inlet valve, 8-2, air vent valve, 8-3, butane stop valve, 8-
4th, butane regulating valve, 9, mass flowmenter；
Legend：Interlock system；Enter control room DCS.
Specific embodiment
With reference to specific embodiment, the present invention is further elaborated.
As shown in the figure：A kind of maleic anhydride production oxidation reaction feed arrangement, the device is provided with air-blaster 1, air preheat
Device 3, blender 4, fourth sky mixer tube 5 and spray gun 6；
Air-blaster 1 is connected with air preheater 3, and air preheater 3 is connected with the top of fourth sky mixer tube 5, empty
It is the electronic butterfly of air intlet that the pipeline of gas air inlet air blower 1 is provided with air inlet valve 8-1, the air inlet valve 8-1
Valve, the connecting line between air-blaster 1 and air preheater 3 is provided with Venturi meter 2 and air vent valve 8-2,
The air vent valve 8-2 is air emptying Pneumatic butterfly valve；
The spray gun 6 is located on the fourth sky side wall of mixer tube 5, and its nozzle is arranged in fourth sky mixer tube 5, its
Fluid inlet is connected with butane water influent pipeline, and gas phase import is connected with compressed air line, and the butane water influent pipeline is provided with
Mass flowmenter 9, butane regulating valve 8-4 and butane stop valve 8-3, the butane stop valve 8-3 are that butane cuts off pneumatic ball valve,
The blender 4 is arranged in the fourth sky mixer tube 5 of the top of spray gun 6；The side wall of the fourth sky mixer tube 5 is provided with
Barrel heats welded tube 7；The barrel heating welded tube 7 is that steam heats welded tube；
The butane mass flowmenter 9 and air Venturi meter 2 are connected with DCS systems respectively；
A kind of feeding process using device as described above, this technical process is as follows：
N-butane feedstock is forced into 0.5 ~ 0.9Mpa, and through mass flowmenter 9, about 7200 ~ 7400kg/h enters the liquid of spray gun 6
Phase import, compressed air enters spray gun 6 by gas phase import, and under the promotion of 0.5 ~ 0.9Mpa pressure, butane liquid is on nozzle top
Crushing is knocked on the target in portion, is produced and is atomized for the first time, then produced by the jet-action of the compressed air sprayed in circumferential weld in nozzle
It is atomized for raw second, liquid-vapor mixture sprays via pressure release in the 6mm-6 holes of top produce third time to be atomized again；Particle diameter is formed to exist
The molecule of 100 ~ 300um, the inlet zone of shape pyramid in 90 °；Air-blaster 1 output air be：Flow
8400m3/ Nhr, pressure 0.15MPa, 150 DEG C of temperature enter fourth sky mixer tube after being warming up to 170 DEG C through air preheater 3
In 5, the butane adverse current with atomization in fourth sky mixer tube 5 is met, and microlayer model moment flash of steam fails the drop of gasification
It is ejected on barrel, barrel exterior measuring is welded with barrel heating welded tube 7, and barrel is heated into 150 ~ 180 DEG C, splashes on barrel
Droplet also by instant vaporization, propeller shape static mixer is equipped with the center of fourth sky mixer tube 5, air is produced rotation
Turn, stir, the gaseous state butane after flash distillation is uniformly mixed with air；Butane flow is controlled by butane regulating valve 8-4, air mass flow
Controlled by air inlet valve 8-1, the signal input DCS of signal and air Venturi meter 2 generation of butane mass flowmenter 9
System, controls butane and air mass flow, into reactor steady production by the production target of butane mole percent 1.6 ~ 1.8%.
When run into stop in emergency with chain situation when, butane stop valve 8-3 cut-out butane charging, air vent valve 8-2 open, so that it may
With the work of reactor under safe stopping.
The present invention has prevented the loss of butane raw material emptying in driving, docking process, opens every time, stopping can save 1-3 tons
Butane raw material, and reduce the consumption of steam；Equipment is simple, eliminates butane evaporator, butane superheater and its attached liquid
The annex of position meter, pressure switch, safety valve etc., reduces leak point, eliminates 2 butane gas phase mass flowmenters and emptying
Regulating valve, simplifies operation；Inventory reaches precisely regulation, and reactor work is more steady, and temperature is more preferably controlled；Save investment
Expense, except eliminating butane evaporator superheat device, also eliminates blow-down pipe and ground flare, with certain company it is newly-built 50,000
As a example by ton cis-butenedioic anhydride：Blow-down pipe DN300, the design of pressing force pipeline specifications, from Cr5mo alloy pipes, more than 500 meters of length adds
The equipment such as upper ground surface torch cost is up to more than million；The present invention has saved investment cost for enterprise, reduces operating cost, improves
Security performance.
Claims (5)
1. a kind of maleic anhydride production oxidation reaction feed arrangement, it is characterised in that：The device is provided with air-blaster（1）, air it is pre-
Hot device（3）, blender（4）, fourth sky mixer tube（5）And spray gun（6）；
Air-blaster（1）With air preheater（3）Connection, air preheater（3）With fourth sky mixer tube（5）Top connects
Connect, air air inlet air blower（1）Pipeline be provided with air inlet valve（8-1）, air-blaster（1）With air preheater
（3）Between connecting line be provided with Venturi meter（2）And air vent valve（8-2）；
The spray gun（6）It is located in fourth sky mixer tube（5）On the wall of side, its nozzle is arranged on fourth sky mixer tube（5）It is interior,
Its fluid inlet is connected with butane water influent pipeline, and gas phase import is connected with compressed air line, is set in the butane water influent pipeline
There is mass flowmenter（9）, butane regulating valve（8-4）And butane stop valve（8-3）, the blender（4）It is arranged on spray gun（6）On
The fourth sky mixer tube of side（5）It is interior；The fourth sky mixer tube（5）Side wall be provided with barrel heating welded tube（7）；It is described
Spray gun（6）Nozzle upwards, and nozzle be arranged on barrel heating welded tube（7）In the heating zone of formation, the blender（4）Set
In nozzle and empty mixer tube（5）Between headspace import；The blender（4）It is helical static mixer；The cylinder
Wall heats welded tube（7）For steam heats welded tube；
The butane mass flowmenter（9）With air Venturi meter（2）It is connected with DCS systems respectively.
2. maleic anhydride production oxidation reaction feed arrangement as claimed in claim 1, it is characterised in that：The air vent valve（8-
2）It is air emptying Pneumatic butterfly valve.
3. maleic anhydride production oxidation reaction feed arrangement as claimed in claim 1, it is characterised in that：The butane stop valve（8-
3）For butane cuts off pneumatic ball valve.
4. maleic anhydride production oxidation reaction feed arrangement as claimed in claim 1, it is characterised in that：The air inlet valve（8-
1）It is air intlet electric butterfly valve.
5. a kind of feeding process using device as claimed in claim 1, it is characterised in that this technical process is as follows：
N-butane feedstock is forced into 0.5 ~ 0.9Mpa, through mass flowmenter（9）, into spray gun（6）Fluid inlet, compressed air
Spray gun is entered by gas phase import（6）, butane liquid is knocked crushing on the target of nipple top, produces and be atomized for the first time, then by
The jet-action of the compressed air sprayed in circumferential weld in nozzle is produced second and is atomized, and liquid-vapor mixture is again via top 6mm-6
Pressure release sprays and produces third time to be atomized in hole；Air-blaster（1）The air of output is through air preheater（3）It is warming up to 170 DEG C
Enter fourth sky mixer tube afterwards（5）It is interior, with the butane being atomized by blender（4）The lower uniform mixing of effect；Butane flow is by fourth
Alkane regulating valve（8-4）Control, air mass flow is by air inlet valve（8-1）Control, butane mass flowmenter（9）Signal and air
Venturi meter（2）The signal input DCS systems of generation, are controlled by the production target of butane mole percent 1.6 ~ 1.8%
Butane and air mass flow, into reactor steady production.
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| CN201510269388.XA CN104826556B (en) | 2015-05-25 | 2015-05-25 | A kind of maleic anhydride production oxidation reaction feed arrangement and its technique |
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| CN107522679B (en) * | 2017-10-18 | 2023-11-07 | 天津渤化工程有限公司 | Accurate charging equipment and maleic anhydride production system |
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| US5895817A (en) * | 1997-06-19 | 1999-04-20 | Praxair Technology, Inc. | Method and apparatus for direct oxygen injection with a reactant stream into a fluidized bed reactor |
| DE10251698A1 (en) * | 2002-11-06 | 2004-06-03 | Robert Bosch Gmbh | metering |
| CN200980995Y (en) * | 2006-12-13 | 2007-11-28 | 江苏钟腾化工有限公司 | Material feeding device for benzene fixed-bed gas-phase catalystic reaction |
| CN103157347A (en) * | 2013-04-01 | 2013-06-19 | 普辉(漳州)轻烃科技发展有限公司 | Method for absorbing maleic-anhydride-containing gas by employing dynamic wave absorption tower |
| CN204724137U (en) * | 2015-05-25 | 2015-10-28 | 濮阳市盛源能源科技股份有限公司 | A kind of maleic anhydride production oxidation reaction feed arrangement |
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Inventor after: Yang Yi Inventor after: Wang Xichen Inventor after: Cheng Guoqiang Inventor after: Luo Hongwei Inventor after: Dang Guanghui Inventor before: Yang Yi Inventor before: Wang Xichen Inventor before: Ren Baosheng Inventor before: Cheng Guoqiang Inventor before: Luo Hongwei Inventor before: Dang Guanghui Inventor after: Yang Yi Inventor after: Wang Xichen Inventor after: Ren Baosheng Inventor after: Cheng Guoqiang Inventor after: Luo Hongwei Inventor after: Dang Guanghui Inventor before: Yang Yi Inventor before: Wang Xichen Inventor before: Ren Baosheng Inventor before: Cheng Guoqiang Inventor before: Luo Hongwei Inventor before: Dang Guanghui |