CN107541238B - A kind of thermal cracking imitative experimental appliance and method - Google Patents
A kind of thermal cracking imitative experimental appliance and method Download PDFInfo
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- CN107541238B CN107541238B CN201610500458.2A CN201610500458A CN107541238B CN 107541238 B CN107541238 B CN 107541238B CN 201610500458 A CN201610500458 A CN 201610500458A CN 107541238 B CN107541238 B CN 107541238B
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Abstract
A kind of thermal cracking imitative experimental appliance and method, described device include feedstock device, pyrolysis furnace and the product quenching recyclable device being linked in sequence, and product quenching recyclable device includes direct quench system and circulation chilling recovery system；The circulation chilling recovery system includes the cracking gas circulation chilling circuit being made of mixing quencher, indirect quencher, cyclone separator, gas circulator and cooler, and mixing quencher is sealedly connected on cracking furnace pipe discharge port；One chilled water (chw) water injection pipe is arranged horizontally in mixing quencher internal upper part region by the direct quench system, and water filling tube end is equipped with water injection hole.It is an advantage of the invention that high-temperature split product successively passes through chilled water (chw) and the direct chilling of recyclegas product in mixing quencher, cooling efficiency is high and chilled water (chw) injection rate is small, it can be effectively prevent the water injection hole coking nearby of chilled water (chw) water injection pipe, improve the accuracy of pyrolysis furnace simulation effect.
Description
Technical field
The present invention relates to a kind of thermal cracking imitative experimental appliance and methods, and in particular to there is one kind novel product chilling to return
The thermal cracking imitative experimental appliance of receiving apparatus and the method for carrying out cracking simulated experiment using the device.
Background technique
The triolefin (ethylene, propylene, butadiene) and triphen (benzene,toluene,xylene) of ethylene unit production are petrochemistry
The basic material of industry plays very important effect in petrochemical industry, while the height of ethylene yield is to measure a state
The important symbol of family's petro chemical industry development level.According to statistics, the propylene of about 95% ethylene and 50% or more in the world
It is to be produced by steam thermal cracking, constantly promotes ethylene unit operation level at present, ensured the optimization of ethylene production
One of development trend as ethylene production, it is therefore desirable to which thermal cracking imitative experimental appliance carries out accurate, spirit to industrial pyrolysis furnace
Living and quickly simulation, Optimizing Process Parameters and pyrolysis furnace operation conditions.
In thermal cracking imitative experimental appliance, cracking furnace pipe is the highest component of operation temperature in ethylene unit, is being cracked
Intersect in boiler tube and a variety of parallel reactions and consecutive reaction occurs, generates purpose product ethylene, the primary first-order equation of propylene should try to promote
It carries out primary first-order equation sufficiently, generates the biggish product liquid of molecular weight down to the secondary response of the raw charcoal of coking, not only raw material disappears
Consumption is big, principal product yield is low, and the raw charcoal of coking can deteriorate heat transfer, and occluding device all brings cracking operation and steady production
Pole detrimental effect should try to inhibit its progress.And the quencher after pyrolysis furnace can crack outlet of still group moment " cooling "
Point, to terminate secondary response, while light component, heavy constituent in cracking gas are isolated as far as possible, and by the dilution in cracking gas
Steam condenses out, therefore quencher is one of the important equipment of thermal cracking imitative experimental appliance.It is well known that being given for any
Fixed pyrolysis furnace operating condition, quencher position is closer to cracking outlet of still, and the temperature reduction for leaving cracking furnace gases is faster, gently
The yield of matter alkene is also bigger.
Currently, the product quenching recyclable device of thermal cracking imitative experimental appliance generally passes through the indirect quencher series connection system of multistage
Cold, patent CN 204111681U discloses a kind of thermal cracking imitative experimental appliance, the quencher of the thermal cracking imitative experimental appliance
The first cooler and the second cooler including sequential connection, the first and second cooler respectively include shell and are mounted on shell
Interior cracking air pipe is flow of cooling water space between shell and cracking air pipe, the Pintsch process come out from cracking furnace pipe
Gas temperature after the quencher is reduced to 200~300 DEG C, can just be cooled to using two-stage water cooler and semiconductor cooler
3~5 DEG C, although the cracking air pipe axis of the first and second cooler being arranged to, there is an angle accelerate coke cleaning operation more
It is prompt, conveniently, but its cooling efficiency is not high and subsequent product separation and recovery need to add multistage cooler, leads to entire simulated experiment
Device volume is larger, and disassembly, inspection operation are inconvenient.And if select will chilled water (chw) inject cracking furnace pipe in carry out direct chilling,
It improves cooling efficiency and saves space, but resistance increases when Pintsch process air-flow fills the water bore region through chilled water (chw), when stop
Between increase, the end Pintsch process gas Yi Qi nearby occur secondary response even coking；And it needs to inject to cracking furnace pipe big
Cracking gas temperature just can be reduced to 40~55 DEG C from 800~900 DEG C of moments by the chilled water (chw) of about 2-3 times feedstock oil inlet amount, be drawn
Furnace overpressure and temperature fluctuation can be caused by having entered a large amount of chilled water (chw)s, and increase the load of subsequent indirect chilling and separator,
It is unfavorable for the cracking liquid product collected and carries out water-oil separating；Long period test is done simultaneously have the cooling of a large amount of chilled water (chw)s be recycled to
Liquid phase product reservoir is cracked, interruption emptying cracking liquid phase product reservoir will cause entire simulation device system pressure oscillation, shadow again
Ring the normal experimental implementation operation of simulator.
Summary of the invention
It is a kind of with novel product the technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide
The thermal cracking imitative experimental appliance of chilling recyclable device, the Pintsch process gas of cracking furnace pipe directly contacts quick anxious with chilled water (chw) out
After cold, then with the recyclegas product mix cooled down and by further chilling, direct chilling combines cooling efficiency height twice
And chilled water (chw) injection rate is small, can effectively prevent cracking gas coking near chilled water (chw) water injection hole, and subsequent indirect chilling and point
Reduce from device load, guarantees the normal experimental implementation operation of simulator, improve the accuracy of pyrolysis furnace simulation effect.
To achieve the goals above, the present invention provides a kind of thermal cracking imitative experimental appliance, the original including sequential connection
Expect feeding device, pyrolysis furnace and product quenching recyclable device；The cracking furnace body center vertical arranges a cracking furnace pipe, institute
The cracking furnace pipe upper end stated is feed inlet, lower end is discharge port；The product quenching recyclable device includes direct quench system
With circulation chilling recovery system；The circulation chilling recovery system includes by mixing quencher, indirect quencher, cyclonic separation
The cracking gas of device, gas circulator and cooler composition recycles chilling circuit, and the mixing quencher is one and cracking
The hollow round table shape quencher of the sealed connection of boiler tube discharge port；The direct quench system includes the chilling being linked in sequence
Water storage tank, chilled water (chw) mass flowmenter, chilled water (chw) water injection pipe, the chilled water (chw) water injection pipe are arranged horizontally in mixing quencher
Portion, one end are connected to mixing quencher inner sidewall, and other end end is equipped with water injection hole.
Above-mentioned thermal cracking imitative experimental appliance, feedstock device include raw material oil tank, feedstock oil feed pump, water storage
Tank and water quality flowmeter, provide feedstock oil and water for cracking reaction.Pyrolysis furnace includes cracking furnace shell, heat-insulated guarantor from outside to inside
Warm layer, cracking furnace pipe, electric heating cracking furnace pipe make feedstock oil and water that Pintsch process reaction occur in cracking furnace pipe.Product quenching
Recyclable device includes direct quench system and circulation chilling recovery system；Direct quench system is by the chilling from chilled water (chw) storage tank
Water injects mixing quencher top after mass flowmenter measures, and Pintsch process temperature degree is reduced to 55 from 800~900 DEG C of moments
~70 DEG C；Circulation chilling recovery system includes cracking gas circulation chilling circuit, cracking liquid phase product reservoir and flowmeter etc., will be split
It vents one's spleen with the recyclegas product that has cooled down to mix the mixing of quencher lower part further cooling, cracked gas temperature is from 55~70
DEG C it is further reduced to 35-50 DEG C, pyrolysis product is separated into gas/liquid two-phase, and be collected, analyze and measure.Due to high temperature
After cracking gas contacts quick chilling with chilled water (chw) on mixing quencher top, followed again with what is cooled down in mixing quencher lower part
Ring gas products are mixed by further chilling, and direct chilling, which combines, twice improves cooling efficiency, and chilled water (chw) injection rate subtracts
Few, chilled water (chw) injection rate is 0.5-1.5 times of feedstock oil inlet amount, preferably the 1 of feedstock oil inlet amount times.
An arch metal baffles are arranged in above-mentioned thermal cracking imitative experimental appliance, the mixing quencher inside,
The setting of arch metal baffles fills the water between tube connection ports and recyclegas product feed inlet in chilled water (chw).The arc of segmental baffle
Shape part is connected to recyclegas product feed inlet side, and cut out portion tilts 5-10 degree to mixing quencher discharge port direction.
Arch metal baffles will mix quencher and be divided into two quenching zones up and down, go out the height of cracking furnace pipe in top quenching zone
Anneal crack, which vents one's spleen directly to contact with chilled water (chw), realizes quick chilling, and the cracking gas after chilling enters through arch metal baffles incision
Lower part quenching zone and the further chilling of recyclegas product mix.
Above-mentioned thermal cracking imitative experimental appliance, for being sufficiently mixed for cracking gas and chilled water (chw) and recyclegas product
Heat transfer realize Pintsch process gas quick chilling, chilled water (chw) fill the water tube connection ports with mix quencher recyclegas product air inlet
It is arranged on the opposite side wall inside mixing quencher.The water injection hole of chilled water (chw) water injection pipe is arranged in cracking furnace pipe central axis
On, water injection hole is at least 4.
Above-mentioned thermal cracking imitative experimental appliance, between the feedstock device and pyrolysis furnace also settable one it is pre-
Hot device improves the temperature for entering the mixed raw material of cracking furnace pipe, is conducive to further shorten cracking furnace pipe length.Preheater pipeline
Spiral coil structure can be used, spiral coil structure increases contact area and the time of contact of mixed raw material, makes raw material mixing more
Add uniformly while reducing preheater and is taken up space.
Above-mentioned thermal cracking imitative experimental appliance, between the water storage tank and water quality flowmeter and chilling water storage tank
It may be provided with a filter between chilled water (chw) mass flowmenter, impurity prevented in storage tank to enter cracking furnace pipe and subsequent
Analytical equipment.
Above-mentioned thermal cracking imitative experimental appliance may be provided with one between the cracking furnace pipe inlet port and outlet port
Differential manometer, by cracking furnace pipe inlet outlet pressure differential numerical value can accurate judgement tube coking degree, realize timely, effective coke cleaning.
The present invention also provides a kind of steam thermal cracking analogue experiment methods, specifically include: water and feedstock oil by raw material into
Material device enters cracking furnace pipe by cracking furnace pipe feed inlet and is cracked, and the chilled water (chw) from chilling water storage tank passes through after metering
Chilled water (chw) water injection pipe injection mixing quencher top and pyrolysis product directly contact cooling, and pyrolysis product after cooling is anxious in mixing
Cooler lower part is further cooled down with the recyclegas product mix cooled down, and separates and recovers gas/liquid phase product.The raw material into
Expect that a preheater is arranged between device and pyrolysis furnace, the preheating temperature of preheater is 460-530 DEG C
Beneficial functional of the invention is:
(1) the product quenching recyclable device of above-mentioned thermal cracking imitative experimental appliance includes that direct quench system and circulation are anxious
Cooling system, Pintsch process gas carry out direct chilling twice inside mixing quencher, and cooling efficiency is high and chilled water (chw) injection rate is small,
Effectively prevent cracking gas from secondary response and the coking nearby of chilled water (chw) water injection hole, and subsequent indirect chilling and separation dress occurs
Load reduction is set, the quick chilling of Pintsch process gas is completed under the premise of not introducing a large amount of inertia quencher.
(2) the chilled water (chw) water filling tube connection ports of above-mentioned thermal cracking imitative experimental appliance and the charging of recyclegas product
One arch metal baffles is set between mouthful, after so that Pintsch process gas is directly contacted the quick chilling cooling of realization with chilled water (chw) again
With the further chilling of recyclegas product mix, avoids Pintsch process gas from directly contacting with gas products and secondary response occurs.
(3) the circulation chilling recovery system of above-mentioned thermal cracking imitative experimental appliance includes by mixing quencher, indirect chilling
The cracking gas chilling circuit of device, cyclone separator, gas circulator and cooler composition, the circulation chilling loop structure letter
Single, design rationally, realizes the separation of gas/liquid phase product and recyclegas product to the double effects of the further chilling of cracking gas.
(4) above-mentioned thermal cracking imitative experimental appliance direct quench system separately sets chilling water storage tank, avoid reaction water with
It is unstable that chilled water (chw) shares same storage tank bring chilled water (chw) injection rate, close and cause the feelings such as temperature and pressure oscillation in boiler tube
Condition, it is ensured that device quiet run.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the thermal cracking imitative experimental appliance structural schematic diagram of one embodiment of the invention.
Fig. 2 is the structural schematic diagram of the product quenching recyclable device of one embodiment of the invention.
Fig. 3 is the chilled water (chw) water injection pipe of one embodiment of the invention, cracking furnace pipe and mixes quencher connection relationship diagram.
Fig. 4 is the arch metal baffles schematic diagram of one embodiment of the invention.
Wherein, appended drawing reference
1 feedstock device
11 raw material oil tanks
12 feedstock oil feed pumps
13 water storage tanks
14 water quality flowmeters
15 water filters
2 pyrolysis furnaces
21 cracking furnace shells
22 pyrolysis furnace insulatings
23 cracking furnace pipes
3 product quenching recyclable devices
31 mixing quenchers
311 upper bottom surface feed inlets
312 side wall upper part connectors
313 lower sidewall feed inlets
314 bottom surface discharge ports
315 arch metal baffles
3151 arch sections
3152 cut out portion
32 direct quench systems
321 chilling water storage tanks
322 chilled water (chw) mass flowmenters
323 chilled water (chw) water injection pipes
3231 water injection holes
324 chilling water filters
33 circulation chilling recovery systems
331 indirect quenchers
332 cyclone separators
333 gas circulators
334 coolers
335 cracking liquid phase product reservoirs
34 flowmeters
4 feed preheaters
41 feed preheater pipelines
42 feed preheater insulatings
5 purging nitrogen valves
6 Air for burning coke valves
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
Referring to figures 1-4, Fig. 1 is the thermal cracking imitative experimental appliance structural schematic diagram of one embodiment of the invention.Fig. 2 is this
Invent the structural schematic diagram of the product quenching recyclable device of an embodiment.Fig. 3 is the mixing quencher of one embodiment of the invention, urgency
The structural schematic diagram of cold water water injection pipe and recyclegas product feed inlet connection relationship.Fig. 4 is the arch of one embodiment of the invention
Metal baffles schematic diagram.Thermal cracking imitative experimental appliance of the invention, feedstock device 1, cracking including sequential connection
Furnace 2, product quenching recyclable device 3.Wherein:
Feedstock device 1 includes raw material oil tank 11, feedstock oil feed pump 12, water storage tank 13 and water quality flowmeter
14, wherein raw material oil tank 11, water storage tank 13 can be forced into 0.1Mpa with nitrogen, while in order to reduce the viscosity of heavy charge,
Raw material oil tank 11 and pipeline can be heated to 65 DEG C by electric heating heat tracing.Water storage tank 13 is preferably added to distilled water, prevents thermal cracking
Incrustation of pipe after imitative experimental appliance is used for a long time reduces heat transfer, mass-transfer efficiency.
Pyrolysis furnace 2 is the high-temperature pyrolysis reactor with cylindrical burner hearth, from outside to inside includes cracking furnace shell 21, cracking
Furnace insulating 22, cracking furnace pipe 23.Cracking furnace pipe 23 is manufactured with high nickel alloy material, and cylindrical burner hearth is arranged vertically at
Center, upper end is feed inlet, and lower end is discharge port.Electrical heating elements are provided with around cracking furnace pipe 23, for original will to be cracked
Material is heated to 750~900 DEG C of high temperature.Cracking furnace pipe 23 includes coaxial thermocouple sheath, and thermocouple sheath is closed at one end, one end
The hollow metal casing of opening, thermocouple sheath closed end is inside cracking furnace pipe feed inlet insertion cracking furnace pipe.Thermometric thermoelectricity
Even to be inserted into from the open end of thermocouple sheath, thermocouple can move radially to monitor the temperature inside cracking furnace pipe along reactor
Distribution.
Product quenching recyclable device 3 includes direct quench system 32 and circulation chilling recovery system 33, for that will crack production
Object carries out quick chilling and is separated into gas-liquid two-phase, and is collected, analyzes and measures.The circulation chilling recovery system 33 is wrapped
It includes and is made of mixing quencher 31, indirect quencher 331, cyclone separator 332, gas circulator 333 and cooler 334
Cracking gas recycles chilling circuit and cracking liquid phase product reservoir 335, and mixing quencher 31 is a hollow round table type quencher,
The preferably upper bottom surface radius rotary table that is greater than bottom radius surface, there is a feed inlet 311 at upper bottom surface center, and bottom surface center has one
A discharge port 314, side wall upper part are equipped with a connector 312, and lower sidewall is equipped with a feed inlet 313, preferably connector
312 and the setting mixing quencher of feed inlet 313 opposite side wall on, mixing quencher feed inlet 311 and cracking furnace pipe discharge port
It is tightly connected, indirect quencher 331 is connected on the bottom surface discharge port 314 of mixing quencher 31.It is come out from mixing quencher
Cracking gas carry out chilling separation in cracking gas circulation chilling circuit, gas-phase product a part of cooler 334 is anxious through mixing out
Cooler lower sidewall feed inlet 313 enters mixing quencher lower part and mixes with the pyrolysis product after the direct chilling of water, another portion
Divide by being vented after 35 quantitative analysis of flowmeter.Quencher 331 is used for the cracked gas temperature that will be come out from mixing quencher
It is further reduced to 15-10 DEG C, the quencher 331 is cylindrical jacket formula structure, and tube side is made in cracking leave with rage, and cryogen walks shell side,
The mixture of second alcohol and water can be used as cryogen, refrigerant temperature is -5~-3 DEG C, and cold and hot logistics is flowed in cross-current configuration；Whirlwind point
From device 332 by vapor condensate liquid and liquid hydrocarbon from being separated and recovered in gas-phase product to cracking in liquid phase product reservoir 34, gas phase
Product is squeezed into cooler 334 through gas circulator 333 and is cooled further to 5-10 DEG C.It can enter simultaneously in cyclone separator 332
A temperature element is added on mouth pipeline, to understand the operating condition of product quenching recyclable device in time, is referred to if there is temperature
The case where showing excessively high (such as > 50 DEG C), can properly increase as the case may be direct quench system 32 chilled water (chw) injection rate or
Person reduces the refrigerant temperature of indirect quencher 331.
The direct quench system 32 include be linked in sequence chilling water storage tank 321, chilled water (chw) mass flowmenter 322,
Chilled water (chw) is injected the fast cooling that Pintsch process gas is realized on mixing quencher top, cracking gas temperature by chilled water (chw) water injection pipe 323
55~70 DEG C are reduced to from 800~900 DEG C of moments.Chilled water (chw) water injection pipe 323 is arranged horizontally in the upper zone in mixing quencher
Domain, one end are connect with the side wall upper part connector 312 of mixing quencher, and in other end insertion mixing quencher cavity and end is set
There is water injection hole, water injection hole is at least 4, and preferably water injection hole is arranged on cracking furnace pipe central axis.Cold water injection rate is through urgency
Cold water mass flowmenter 312 measures, and cold water injection rate is 0.5-1.5 times of feedstock oil inlet amount, and preferably 1 times, chilled water (chw) stores up
Tank 311 can be forced into 0.1Mpa with nitrogen.One is additionally provided between chilling water storage tank 321 and chilled water (chw) mass flowmenter 322
Filter 324 can effectively prevent impurity in storage tank to enter cracking furnace pipe and subsequent analytical equipment.
One arch metal baffles 315 is set inside the mixing quencher, and the setting of arch metal baffles 315 exists
Between side wall upper part connector 312 and lower sidewall feed inlet 313, the arch section 3151 of preferably segmental baffle is connected to
313 side of recyclegas product feed inlet, cut out portion 3152 can tilt 5-10 degree to mixing 314 direction of quencher discharge port,
Cut height is 10%-20%.
In the present embodiment, a preheater 4, preheater are additionally provided between the feedstock device 1 and pyrolysis furnace 2
4 be respectively feed preheater pipeline 41 and feed preheater insulating 42 from inside to outside.The preheater pipeline 41 is excellent
Choosing uses spiral coil structure.The preheating temperature of the preheater 4 is 460-530 DEG C.
In the present embodiment, a differential manometer is additionally provided between the cracking furnace pipe inlet port and outlet port.Work as pressure difference
When meter reading is greater than pressure drop (such as 10kpa) of preset cracking furnace pipe, thermal cracking imitative experimental appliance should be burnt.
Feedstock oil charging is cut off when burning, and cracking liquid phase product recoverer 34 is emptied, and opens nitrogen valve 5 to 4 He of preheater
Pyrolysis furnace 2 carries out nitrogen purging, and nitrogen purging opens Air for burning coke valve 6 after twenty minutes and is passed through nitrogen/air burning to pyrolysis furnace
It is burnt.
It is enterprising in thermal cracking imitative experimental appliance A and B respectively with identical cracking operation condition and identical cracking stock below
Row cracking simulation comparison test, illustrates the quick urgency using thermal cracking imitative experimental appliance of the invention to Pintsch process gas
Beneficial effect that is cold and inhibiting coking.Thermal cracking imitative experimental appliance A and B the feedstock device having the same is split
Furnace is solved, only product separating and reclaiming device structure is different.Wherein the product separating and reclaiming device of thermal cracking imitative experimental appliance A includes
Two sections of indirect quenchers of series connection, cyclone separator, cracking liquid phase product reservoir, cooler and flowmeter etc., out cracking furnace pipe
Pintsch process gas enters indirect two-stage quencher and realizes that quick chilling, indirect two-stage quencher include shell and be mounted on shell
Interior cracking air pipe, is the cryogen flowing space between shell and cracking air pipe, and quencher length is 300mm, diameter of the housing
50mm, cracking gas pipeline diameter 10mm, the mixture of second alcohol and water is as cryogen, and refrigerant temperature is -5 DEG C, and cold and hot logistics is in mistake
The flowing of manifold formula；Through cyclone separator vapor condensate liquid and liquid hydrocarbon separated and recovered from gas-phase product after quick chilling to
Crack liquid phase product reservoir in, gas-phase product after cooler further cools down by flowmeter quantitative analysis after be vented.Hot tearing
The product quenching recyclable device of imitative experimental appliance B is solved by direct quench system of the invention and circulation chilling recovery system group
Quick chilling is directly contacted with chilled water (chw) on mixing quencher top at, Pintsch process gas, again with the recyclegas that has cooled down
For product in the mixing of mixing quencher lower part and by further chilling, the chilled water (chw) injection rate of direct quench system is 100g/h,
Recycle the phase of indirect quencher, cyclone separator and the cooler of chilling recovery system with thermal cracking imitative experimental appliance A
Together.
Naphtha is the most common cracking stock of industrial ethylene cracker, therefore this comparison cracking simulation test is with stone
Cerebrol is cracking stock, and physical data is as shown in table 1.The density of naphtha used is in 0.70g/cm-3Left and right, characterization factor 12
Left and right, 30 DEG C~170 DEG C of engler's boiling range；Race's composition constitute in linear paraffin mass fraction 30% or so, alkane (straight chain alkane
Hydrocarbon+branched paraffin) mass fraction is 65% or so, and all ethylene unit often uses naphtha physical property to every physical parameter at home
Within the scope of, the common naphtha of most of ethylene units can be represented, test result has generality and reliable spy
Point.
The physical data of 1 naphtha of table
Crack simulation test operating condition are as follows: naphtha feed amount is 90g/h, and water inlet amount is 47.5g/h, inlet pressure
0.1Mpa, residence time 100ms, cracking temperature are 890 DEG C, and the cracking simulation test time is 1.5h, during test, cracking
Gas phase is analyzed after gas-liquid separation and cooling by on-line gas chromatography, and lysate carries out poidometer after mutually passing through water-oil separation
Amount.After the completion of cracking simulation test, be passed through and burn gas by what nitrogen and air mixed, to cracking furnace pipe institute coking carbon into
Row is burnt, and wherein air capacity is 40L/h, nitrogen amount 10L/h, analyzed by infrared spectrum analyser and record burn CO in gas and
CO2The coking amount of concentration, cracking furnace pipe is calculated by the record result of infrared spectrum analyser, referring to Chinese patent
CN1580192A, as the CO and CO that burn in gas detected2Concentration from peak-fall to straight line when burn end, from
Start to be passed through and burns gas to the CO and CO burnt in gas2Concentration be straight line duration be burn the duration.
In different thermal cracking imitative experimental appliances (A and B) carry out naphtha pyrolysis simulation test major cleavage products yield and
Coking amount variation is shown in Table shown in 2, table 3.
The primary product yield of simulation test is cracked in the different imitative experimental appliance of table 2
The coking amount of simulation test is cracked in the different imitative experimental appliance of table 3
By table 2 and table 3 it is found that compared with thermal cracking imitative experimental appliance A, thermal cracking simulated experiment dress of the present invention
B is set to follow by the way that chilled water (chw) to be directly injected into the quick chilling for mixing quencher top and carrying out Pintsch process gas, then with what is cooled down
Ring gas products mix further chilling in mixing quencher lower part, and temperature is reduced to 25.1 when cracking gas is into cyclone separator
DEG C, the quick chilling of Pintsch process gas is realized, triolefin (ethylene, propylene, butadiene) yield is increased slightly in gas-phase product,
C5And C5Above constituent content is lower, and liquid-phase pyrolysis collection of products is abundant, illustrate the quick chilling of product inhibit pyrolysis product into
Row secondary response, product separation is more abundant, and entire test process overall material balance is more excellent.It is split from different imitative experimental appliances
The coking amount comparison for solving simulation test can be seen that thermal cracking imitative experimental appliance B of the present invention for chilled water (chw) water injection pipe
It is arranged horizontally in mixing quencher top, the average pressure difference of cracking furnace pipe inlet and outlet is smaller during test, is passed through same amount of burning
Burnt gas is burnt, and decreased duration is burnt, and coking amount is obviously reduced.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (12)
1. a kind of thermal cracking imitative experimental appliance, feedstock device, pyrolysis furnace and product quenching recycling including sequential connection
Device；The cracking furnace body center vertical arranges a cracking furnace pipe, and the cracking furnace pipe upper end is feed inlet, lower end is
Discharge port；The product quenching recyclable device includes direct quench system and circulation chilling recovery system；The circulation is anxious
Cold recovery system includes by mixing quencher (31), indirect quencher (331), cyclone separator, gas circulator and cooling
Device (334) composition cracking gas recycle chilling circuit, mixing quencher be one with cracking furnace pipe discharge port sealed connection in
Empty truncated cone-shaped quencher；The direct quench system includes the chilling water storage tank being linked in sequence, chilled water (chw) mass flowmenter, urgency
Cold water water injection pipe, the chilled water (chw) water injection pipe are arranged horizontally in the upper area in mixing quencher, and one end is connected to mixing
Quencher inner sidewall, other end end are equipped with water injection hole.
2. thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that setting inside the mixing quencher
One arch metal baffles, the arch metal baffles setting fill the water tube connection ports and recyclegas product in chilled water (chw)
Between feed inlet.
3. thermal cracking imitative experimental appliance as claimed in claim 2, which is characterized in that the recyclegas product feed inlet is set
It sets on the opposite side wall of chilled water (chw) water filling tube connection ports.
4. thermal cracking imitative experimental appliance as claimed in claim 3, which is characterized in that the water filling of the chilled water (chw) water injection pipe
Hole is arranged on cracking furnace pipe central axis.
5. thermal cracking imitative experimental appliance as claimed in claim 2, which is characterized in that the arch section of the segmental baffle
It is connected to recyclegas product feed inlet side, cut out portion tilts 5-10 degree to mixing quencher discharge port direction.
6. thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the chilled water (chw) injection rate is raw material
0.5-1.5 times of oily inlet amount.
7. thermal cracking imitative experimental appliance as claimed in claim 6, which is characterized in that the chilled water (chw) injection rate is raw material
1 times of oily inlet amount.
8. thermal cracking imitative experimental appliance as claimed in claim 6, which is characterized in that the water filling of the chilled water (chw) water injection pipe
Hole is at least 4.
9. thermal cracking imitative experimental appliance as claimed in claim 6, which is characterized in that the feedstock device and pyrolysis furnace
Between be arranged a preheater, the preheater pipeline use spiral coil structure.
10. thermal cracking imitative experimental appliance as claimed in claim 6, which is characterized in that the cracking furnace pipe feed inlet and
One differential manometer is set between discharge port.
11. a kind of method using the thermal cracking imitative experimental appliance as described in any one of claim 2-5, it is characterised in that
Include: that water enters cracking furnace pipe by cracking furnace pipe feed inlet by feedstock device with feedstock oil and cracked, comes from chilling
The chilled water (chw) of water storage tank pass through after metering chilled water (chw) water injection pipe injection mixing quencher top directly contacted with pyrolysis product it is cold
But, pyrolysis product after cooling is further cooled down in mixing quencher lower part with the recyclegas product mix cooled down, and point
From recycling gas/liquid phase product.
12. method as claimed in claim 11, which is characterized in that one is arranged between the feedstock device and pyrolysis furnace
Preheater, the preheating temperature of preheater are 460-530 DEG C.
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| CN202131285U (en) * | 2011-04-12 | 2012-02-01 | 中国石油化工股份有限公司 | Device for slowing down coking of oil gas pipeline on top of coke tower |
| CN204111681U (en) * | 2014-10-14 | 2015-01-21 | 中国石油天然气股份有限公司 | A kind of steam cracking analogue experiment installation and quencher thereof |
| CN105623721A (en) * | 2014-10-31 | 2016-06-01 | 中国石油化工股份有限公司 | Method for preparing raw material for needle-like coke |
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| US7235705B2 (en) * | 2004-05-21 | 2007-06-26 | Exxonmobil Chemical Patents Inc. | Process for reducing vapor condensation in flash/separation apparatus overhead during steam cracking of hydrocarbon feedstocks |
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| CN202131285U (en) * | 2011-04-12 | 2012-02-01 | 中国石油化工股份有限公司 | Device for slowing down coking of oil gas pipeline on top of coke tower |
| CN204111681U (en) * | 2014-10-14 | 2015-01-21 | 中国石油天然气股份有限公司 | A kind of steam cracking analogue experiment installation and quencher thereof |
| CN105623721A (en) * | 2014-10-31 | 2016-06-01 | 中国石油化工股份有限公司 | Method for preparing raw material for needle-like coke |
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