CN107541240B - Steam thermal cracking simulation experiment device and process - Google Patents
Steam thermal cracking simulation experiment device and process Download PDFInfo
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- CN107541240B CN107541240B CN201610500457.8A CN201610500457A CN107541240B CN 107541240 B CN107541240 B CN 107541240B CN 201610500457 A CN201610500457 A CN 201610500457A CN 107541240 B CN107541240 B CN 107541240B
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Abstract
The invention provides a steam thermal cracking simulation experiment device and a steam thermal cracking simulation experiment process, wherein the device comprises a raw material feeding device, a cracking furnace, a product quenching device and a product separation and recovery device which are sequentially connected, the product quenching device comprises a direct quenching system and an indirect quencher, the direct quenching system is characterized in that a quenching water injection pipe is vertically inserted into a discharge hole of the cracking furnace pipe, the end part of the inserted end part is conical, water injection holes are uniformly formed in the circumference of the bottom surface of the conical end part, quenching water is directly injected into the cracking furnace pipe through the water injection holes, and high-temperature cracking gas is rapidly quenched by the quenching water and then enters the indirect quencher. The invention has the advantages that the novel product quenching device is favorable for rapidly quenching the high-temperature cracking gas, the pressure loss of the cracking gas in the furnace tube is reduced, the coking near the quenching water injection hole is effectively prevented, the stable operation of the simulation device is ensured, and the accuracy of the simulation effect of the cracking furnace is improved.
Description
Technical field
The present invention relates to a kind of steam thermal cracking imitative experimental appliance and techniques, and in particular to one kind has novel product anxious
The steam thermal cracking imitative experimental appliance of device for cooling and the technique 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 steam thermal cracking imitative experimental appliance carries out industrial pyrolysis furnace quasi-
Really, it flexibly and quickly simulates, Optimizing Process Parameters and pyrolysis furnace operation conditions.
In steam thermal cracking imitative experimental appliance, cracking furnace pipe is the highest component of operation temperature in ethylene unit,
Intersect in cracking furnace pipe and a variety of parallel reactions and consecutive reaction occur, should try to promote to generate purpose product ethylene, propylene one
Secondary response sufficiently carries out, and generates the secondary response that the biggish product liquid of molecular weight gives birth to charcoal down to coking, not only consumption of raw materials
Greatly, principal product yield is low, and the raw charcoal of coking can deteriorate heat transfer, and occluding device all brings pole to cracking operation and steady production
Detrimental effect should try to inhibit its progress.And the quencher after pyrolysis furnace can moment " cooling " pyrolysis furnace outlet component,
To terminate secondary response, while light component, heavy constituent in cracking gas are isolated as far as possible, and by the dilution steam generation in cracking gas
It condenses out, therefore quencher is one of the important equipment of steam thermal cracking imitative experimental appliance.It is well known that being given for any
Fixed pyrolysis furnace operating condition, closer to cracking outlet of still, the temperature reduction for leaving cracking furnace gases is faster for quencher position, can
Effectively inhibit the even coking of pyrolysis product further occurrence secondary response.
Currently, the product quenching device of steam thermal cracking imitative experimental appliance generally passes through the indirect quencher series connection system of multistage
Cold, patent CN 204111681U discloses a kind of steam thermal cracking imitative experimental appliance, the steam thermal cracking imitative experimental appliance
Quencher include the first cooler and the second cooler being linked in sequence with pyrolysis furnace discharge port, the first and second cooler point
Shell and the intracorporal cracking air pipe of shell Bao Kuo not be mounted on, be flow of cooling water space between shell and cracking air pipe, from
The Pintsch process gas that pyrolysis furnace comes out cools down rapidly by the quencher, and temperature is reduced to 200~300 DEG C, using two-stage water
Cooler and semiconductor cooler can just be cooled to 3~5 DEG C, although the cracking air pipe axis of the first and second cooler is arranged to
Coke cleaning operation can be made more quick and easy with an angle, but its cooling efficiency is high and subsequent product separating and reclaiming device
Multistage cooler is added, entire imitative experimental appliance volume is larger, and disassembly, inspection operation are inconvenient.And if selecting chilled water (chw)
It injects cracking furnace pipe discharge port and carries out direct chilling, since chilled water (chw) is directly contacted with Pintsch process gas, chilled water (chw) injection rate
Slight fluctuations will cause chilled water (chw) water filling port zone temperature fluctuations, and cracking furnace pipe internal state is unstable, while chilled water (chw) fills the water
Pipe insertion cracking furnace pipe will cause resistance when cracked gas stream fills the water bore region through chilled water (chw) and increase, and the residence time increases, high anneal crack
Vent one's spleen the end Yi Qi nearby occur secondary response even coking.Therefore the structure design and chilled water (chw) of chilled water (chw) water injection pipe
Stablizing injection is an important factor for influencing the near zone coking of chilled water (chw) water injection hole, and tube coking will affect the heat transfer of boiler tube, pass
Matter efficiency, accuracy that is close and influencing cracking simulation effect can block pipeline palpus blowing out and burn, influence simulation dress when coking is serious
The normal experimental implementation operation set.
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
A kind of steam thermal cracking imitative experimental appliance of quenching apparatus, direct quench system cooling efficiency is high, effectively cracking is inhibited to produce
The secondary response of object, the separation of gas/liquid phase product sufficiently, can prevent the coking nearby of chilled water (chw) water injection hole, guarantee simulator just
The accuracy of pyrolysis furnace simulation effect is improved while normal experimental implementation operation.
To achieve the goals above, the present invention provides a kind of steam thermal cracking imitative experimental appliances, including are linked in sequence
Feedstock device, pyrolysis furnace, product quenching device and product separating and reclaiming device, the described pyrolysis furnace center vertical arrangement
A piece cracking furnace pipe, the cracking furnace pipe upper end is feed inlet, lower end is discharge port；The product quenching device includes direct
Chilling system and indirect quencher, the direct quench system include the chilling water storage tank being linked in sequence, chilled water (chw) quality stream
Meter and chilled water (chw) water injection pipe, the chilled water (chw) water injection pipe are inserted vertically into cracking furnace pipe discharge port, and the end of insertion end is in circle
Taper, is uniformly provided with water injection hole on the base circumference of conical end, the cracking furnace pipe discharge port, chilled water (chw) water injection pipe with
Indirect quencher is tightly connected by a T-type threeway, and chilled water (chw) is directly injected into cracking furnace pipe through water injection hole, Pintsch process gas
Enter indirect quencher after the quick chilling of chilled water (chw).
Above-mentioned steam 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 from outside to inside include cracking furnace shell, every
Hot insulating layer, cracking furnace pipe, cracking furnace pipe electricity consumption are heated, and it is anti-that Pintsch process occurs in cracking furnace pipe for feedstock oil and water
It answers.Product separating and reclaiming device includes cyclone separator, cracking liquid phase product reservoir, cooler and flowmeter etc., for that will split
Solution product carries out being separated into gas-liquid two-phase, and is collected, analyzes and measures.Product quenching device include direct quench system and
Indirect quencher, the chilled water (chw) from chilling water storage tank are directly injected into cracking furnace pipe discharge port after mass flowmenter measures, high
Anneal crack is vented one's spleen enters indirect quencher after the quick chilling of chilled water (chw).It will cause pyrolysis furnace tube temperature since chilled water (chw) injection rate is excessive
Degree fluctuation is big and will increase cracking liquid phase product oil water separating difficulty, and chilled water (chw) injection rate should not be too large, chilled water (chw) injection rate
The too small quick chilling for being unfavorable for Pintsch process gas, therefore chilled water (chw) injection rate is 1-3 times of feedstock oil inlet amount, it is preferably former
2 times for expecting oily inlet amount.
Above-mentioned steam thermal cracking imitative experimental appliance, wherein the chilled water (chw) water injection pipe is inserted vertically into cracking furnace pipe
Discharge port is inserted into the end of one end in cone, and the height of conical end is the 1/5-1/10 that chilled water (chw) fills the water length of tube, excellent
It is selected as the 1/7 of chilled water (chw) water filling length of tube；The diameter of chilled water (chw) water injection pipe is the 1/4-3/4 of cracking furnace pipe diameter, and length is to split
The 1/8-1/12 of boiler tube length is solved, preferably diameter is the 1/2 of cracking furnace pipe diameter, and length is the 1/10 of cracking furnace pipe length；Circle
Water injection hole is uniformly provided on the base circumference of tapered end, chilled water (chw) is directly injected into cracking furnace pipe through water injection hole, and water injection hole is extremely
It is less 4.
Above-mentioned steam thermal cracking imitative experimental appliance, wherein may be used also between the feedstock device and pyrolysis furnace
One preheater is set, improves the temperature for entering the mixed raw material of cracking furnace pipe, is conducive to further shorten cracking furnace pipe length.
Spiral coil structure can be used in preheater pipeline, and spiral coil structure increases contact area and the time of contact of mixed raw material, makes
Raw material mixing is more uniform while reducing preheater and is taken up space.
Above-mentioned steam thermal cracking imitative experimental appliance, wherein between the water storage tank and water quality flowmeter and
It may be provided with a filter between chilling water storage tank and chilled water (chw) mass flowmenter, impurity entrance in storage tank effectively prevent to split
Solve boiler tube and subsequent analytical equipment.
Above-mentioned steam thermal cracking imitative experimental appliance, wherein between the cracking furnace pipe inlet port and outlet port also
May be provided with a differential manometer, by cracking furnace pipe inlet outlet pressure differential numerical value can accurate judgement tube coking degree, realize in time,
Effective coke cleaning.
The present invention also provides a kind of steam thermal cracking simulated experiment techniques, 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 chilled water (chw) storage pipe passes through after metering
Chilled water (chw) water injection pipe injection cracking furnace pipe discharge port and pyrolysis product directly contact cooling, and pyrolysis product after cooling enters indirect
Quencher is further cooled down, and enters product separating and reclaiming device after cooling.Between the feedstock device and pyrolysis furnace
One preheater is set, and the preheating temperature of preheater is 460-530 DEG C
Beneficial functional of the invention is:
(1) the chilled water (chw) water injection pipe of the direct quench system of above-mentioned steam thermal cracking imitative experimental appliance is inserted into pyrolysis furnace
One end end of pipe in cone, Pintsch process gas through conical end drain gradually to chilled water (chw) water injection pipe and cracking furnace pipe it
Between annulus flow, chilling system resistance reduces, and the pressure loss of cracking gas reduces；Simultaneously by the water filling of chilled water (chw) water injection pipe
Hole is uniformly arranged on the base circumference of conical end, and realize chilled water (chw) and Pintsch process gas is sufficiently mixed heat transfer, is had
Conducive to the quick chilling of Pintsch process gas, it is effectively prevent the coking nearby of chilled water (chw) water injection hole, guarantees the normal experiment of simulator
Operation operation.
(2) above-mentioned steam thermal cracking imitative experimental appliance separately sets chilling water storage tank, avoids reaction water and chilled water (chw) is total
It is unstable with same storage tank bring chilled water (chw) injection rate, it is close and the case where cause temperature fluctuation in boiler tube, it is ensured that device is steady
Operation.
(3) the chilled water (chw) water injection pipe structure of above-mentioned steam thermal cracking imitative experimental appliance designs advantages of simple, easily fabricated
Welding, chilled water (chw) water injection pipe and cracking furnace pipe discharge port, indirect quencher connection type are simple, maintenance easy to disassemble.
(4) above-mentioned steam thermal cracking simulated experiment technique is direct in Pintsch process gas using chilled water (chw) to be injected directly into
Cooling mode, temperature has dropped down to 35~50 DEG C when cracking gas goes out cracking furnace pipe discharge port, and cooling efficiency is high, improves pyrolysis furnace simulation
The accuracy of effect can also reduce the quantity of cooler in subsequent products separating and reclaiming device.
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 steam thermal cracking imitative experimental appliance structural schematic diagram of one embodiment of the invention.
Fig. 2 is the structural schematic diagram of the direct quench system of one embodiment of the invention.
Fig. 3 is the structural schematic diagram of the chilled water (chw) water injection pipe of one embodiment of the invention.
Fig. 4 is the chilled water (chw) water injection pipe and cracking furnace pipe connection relationship 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
231 cracking furnace pipe feed inlets
232 cracking furnace pipe discharge ports
24 thermocouple sheaths
25 thermocouples
3 product quenching devices
31 direct quench systems
311 chilling water storage tanks
312 chilled water (chw) mass flowmenters
313 chilled water (chw) water injection pipes
3131 conical ends
3132 water injection holes
3133 connecting pins
314 chilling water filters
315 T-type threeways
32 indirect quenchers
4 product separating and reclaiming devices
41 cyclone separators
42 cracking liquid phase product reservoirs
43 coolers
44 flowmeters
5 feed preheaters
51 feed preheater pipelines
52 feed preheater insulatings
6 purging nitrogen valves
7 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:
It is the steam thermal cracking imitative experimental appliance structural schematic diagram of one embodiment of the invention referring to Fig. 1, Fig. 1.The present invention
Steam thermal cracking imitative experimental appliance, feedstock device 1, pyrolysis furnace 2,3 and of product quenching device including sequential connection
Product separating and reclaiming device 4.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 its pipeline can be heated to 65 DEG C by electric heating heat tracing.It is preferably added to distilled water in water storage tank 13, prevents from steaming
Incrustation of pipe after vapour thermal cracking 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 be feed inlet 231, lower end be discharge port 232.Electrical heating elements are provided with around cracking furnace pipe 23, being used for will
Cracking stock is heated to 750~900 DEG C of high temperature.Cracking furnace pipe 23 includes coaxial thermocouple sheath 24, and thermocouple sheath 24 is one
End seal closes, hollow metal casing open at one end, inside cracking furnace pipe feed inlet insertion cracking furnace pipe.Temperature thermocouple 25 from
The open end of thermocouple sheath is inserted into, and can be moved radially along reactor to monitor the Temperature Distribution inside cracking furnace pipe；
Product quenching device 3 includes direct quench system 31 and indirect quencher 32, and the direct quench system 31 is wrapped
The chilling water storage tank 311, chilled water (chw) mass flowmenter 312, chilled water (chw) water injection pipe 313 for including sequential connection, pass through self-pressurization in future
The chilled water (chw) of chilling water storage tank 311 is directly injected into Pintsch process gas through chilled water (chw) water injection pipe 313 and realizes fast cooling, cracking gas
Temperature is reduced to 35~50 DEG C from 800~900 DEG C of moments, and chilled water (chw) injection rate is measured through chilled water (chw) mass flowmenter 312, chilling
Water storage tank 311 can be forced into 0.1Mpa with nitrogen.The indirect quencher 32 is cylindrical jacket formula structure, and pipe is made in cracking leave with rage
Journey, cryogen walk shell side, and the mixture of second alcohol and water can be used as cryogen, and refrigerant temperature is -5~-3 DEG C, and cold and hot logistics is in cross-flow
Form flowing, can be further reduced to 20-30 DEG C for cracked gas temperature, the chilling for meeting steam thermal cracking imitative experimental appliance is wanted
It asks；
Product separating and reclaiming device 4 includes cyclone separator 41, cracking liquid phase product reservoir 42, cooler 43 and flowmeter
44 etc., it is separated into gas-liquid two-phase for carrying out pyrolysis product, and be collected, analyze and measure.Chilling product is passing through rotation
By vapor condensate liquid and liquid hydrocarbon from being separated and recovered in gas-phase product to cracking in liquid phase product reservoir 42 when wind separator 41,
Cracking liquid product is vented after passing through 44 quantitative analysis of flowmeter by carrying out Weighing, gas-phase product after water-oil separation.
- Fig. 4 referring to fig. 2, Fig. 2 are the structural schematic diagram of the product quenching device 3 of one embodiment of the invention.Fig. 3 is this hair
The structural schematic diagram of the chilled water (chw) water injection pipe 313 of a bright embodiment.Fig. 4 is the chilled water (chw) water injection pipe 313 of one embodiment of the invention
With 23 connection relationship diagram of cracking furnace pipe.Direct quench system 31 of the invention mainly solves previous steam thermal cracking simulation
The cooling efficiency of indirect chilling present in experimental provision is high and the chilled water (chw) water injection hole of direct chilling nearby easily coking etc. is asked
Topic.The chilled water (chw) water injection pipe 313 includes a conical end 3131 and connecting pin 3133, the chilled water (chw) water injection pipe
313, indirect quencher 32 is tightly connected with cracking furnace pipe discharge port 232 by a T-type threeway 315, cracking furnace pipe discharge port
232 and chilled water (chw) water injection pipe connecting pin 3133 be connected on the main line of T-type threeway, indirect quencher 32 is connected to T-type threeway
Bye-pass on, the conical end 3131 of chilled water (chw) water injection pipe is inserted vertically into cracking furnace pipe discharging through the main line of T-type threeway
Mouthful, the base circumference of conical end 3131 is uniformly provided with water injection hole 3132, and Pintsch process gas is quick through direct quench system 31
It is further cooling to enter indirect quencher 32 after chilling.Simultaneously a thermometric member can be added on indirect 32 suction line of quencher
Part, to understand the chilling operating condition of direct quench system 31 in time, if there are the feelings that temperature indicates excessively high (such as > 50 DEG C)
Condition can properly increase the injection rate of chilled water (chw) as the case may be or reduce the refrigerant temperature of indirect quencher 32.
In the present embodiment, a preheater 5, preheater may be provided between the feedstock device 1 and pyrolysis furnace 2
5 be respectively feed preheater pipeline 51 and feed preheater insulating 52 from inside to outside.The preheater pipeline 51 is excellent
Choosing uses spiral coil structure.The preheating temperature of the preheater 5 is 460-530 DEG C.The water storage tank 13 and water quality
It may be provided with a filter between flowmeter 14 and between chilling water storage tank 311 and chilled water (chw) mass flowmenter 312
314。
In the present embodiment, a pressure difference is also provided between the cracking furnace pipe feed inlet 231 and discharge port 232
Meter.When differential manometer reading is greater than pressure drop (such as 10kpa) of preset cracking furnace pipe, the simulated experiment of steam thermal cracking is coped with
Device is burnt.Feedstock oil charging is cut off when burning, product separating and reclaiming device 4 is emptied, and opens 6 pairs of nitrogen valve preheatings
Device 5 and pyrolysis furnace 2 carry out nitrogen purging, and nitrogen purging opens Air for burning coke valve 7 after twenty minutes and is passed through nitrogen/sky to pyrolysis furnace
Gas is burnt.
Below with identical cracking operation condition and identical cracking stock respectively in steam thermal cracking imitative experimental appliance A and this
Cracking simulation comparison test is carried out in steam thermal cracking imitative experimental appliance B shown in invention figure 1, is illustrated using of the invention
Steam thermal cracking imitative experimental appliance is to the quick chilling of Pintsch process gas and the beneficial effect of inhibition coking.The steam heat
Imitative experimental appliance A and B feedstock device, pyrolysis furnace and product separating and reclaiming device having the same are cracked, only product
Quenching apparatus structure is different；Wherein the product quenching device of steam thermal cracking imitative experimental appliance A is by indirect two-stage quencher string
Connection composition, indirect two-stage quencher include shell and are mounted on the intracorporal cracking air pipe of shell, shell and cracking air pipe it
Between be the cryogen flowing space, quencher length be 300mm, diameter of the housing 50mm, cracking gas pipeline diameter 10mm, second alcohol and water
Mixture is as cryogen, and refrigerant temperature is -5 DEG C, and cold and hot logistics is flowed in cross-current configuration；Steam thermal cracking imitative experimental appliance B
Quenching apparatus be made of direct quench system of the invention and indirect quencher, the chilled water (chw) injection rate of direct quench system is
200g/h, indirect quencher are identical as the indirect quencher of steam thermal cracking imitative experimental appliance A.
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, when the concentration of the CO burnt in gas and CO2 that detect burn end after from peak-fall to straight line, from
Start to be passed through burn gas to the concentration of the CO and CO2 that burn in gas be straight line duration be burn the duration.
The major cleavage products yield of naphtha pyrolysis simulation test is carried out in different steam thermal cracking imitative experimental appliances (A and B)
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 steam thermal cracking imitative experimental appliance A, steam thermal cracking mould of the present invention
Draft experiment device B is by being directly injected into cracking furnace pipe discharge port for chilled water (chw), and temperature has dropped when Pintsch process gas goes out quenching apparatus
To 25.9 DEG C, the quick chilling of Pintsch process gas is realized, triolefin (ethylene, propylene, butadiene) yield omits in gas-phase product
There are increase, C5And C5Above constituent content is lower, and liquid-phase pyrolysis collection of products is abundant, illustrates that the quick chilling of product inhibits and splits
It solves product and carries out secondary response, be also beneficial to subsequent product separation and recovery, entire test process overall material balance is more excellent.Never
The coking amount comparison of simulation test is cracked in same imitative experimental appliance as can be seen that chilled water (chw) water injection pipe is inserted vertically into cracking
Cracking furnace pipe imports and exports average pressure difference during furnace discharge mouth does not significantly increase test, and is passed through same amount of gas that burns and carries out
It burns, burns decreased duration, 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
Various corresponding changes and modifications, but these corresponding changes and modifications can be made according to the present invention by knowing those skilled in the art
All it should fall within the scope of protection of the appended claims of the present invention.
Claims (13)
1. a kind of steam thermal cracking imitative experimental appliance, feedstock device, pyrolysis furnace, product quenching dress including sequential connection
It sets and arranges a cracking furnace pipe with product separating and reclaiming device, the pyrolysis furnace center vertical, the cracking furnace pipe upper end is
Feed inlet, lower end are discharge port, which is characterized in that the product quenching device includes direct quench system and indirect chilling
Device, the direct quench system include chilling water storage tank, chilled water (chw) mass flowmenter and the chilled water (chw) water injection pipe being linked in sequence,
Cracking furnace pipe discharge port, chilled water (chw) water injection pipe and the indirect quencher is tightly connected by a T-type threeway, the urgency
Cold water water injection pipe is inserted vertically into cracking furnace pipe discharge port, is inserted into the end of one end in cone, the base circumference of conical end
On be uniformly provided with water injection hole.
2. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the chilled water (chw) injection rate is
1-3 times of feedstock oil inlet amount.
3. steam thermal cracking imitative experimental appliance as claimed in claim 2, which is characterized in that the chilled water (chw) injection rate is
2 times of feedstock oil inlet amount.
4. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the chilled water (chw) water injection pipe
Water injection hole is at least 4.
5. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the chilled water (chw) water injection pipe
The height of conical end is the 1/5-1/10 that chilled water (chw) fills the water length of tube.
6. steam thermal cracking imitative experimental appliance as claimed in claim 5, which is characterized in that the chilled water (chw) water injection pipe
The height of conical end is that chilled water (chw) fills the water the 1/7 of length of tube.
7. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the chilled water (chw) water injection pipe
Diameter is the 1/2 of cracking furnace pipe diameter, and length is the 1/10 of cracking furnace pipe length.
8. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the feedstock device and split
It solves and a preheater is set between furnace, the pipeline of the preheater uses spiral coil structure.
9. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the feedstock device
A filtering is arranged in water storage tank and water quality flowmeter including sequential connection between the water storage tank and water quality flowmeter
Device.
10. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the chilling water storage tank
One filter is set between chilled water (chw) mass flowmenter.
11. steam thermal cracking imitative experimental appliance as described in claim 1, which is characterized in that the cracking furnace pipe into
One differential manometer is set between material mouth and discharge port.
12. a kind of technique using the steam thermal cracking imitative experimental appliance as described in any one of claim 1-11, special
Sign is to include: that water enters cracking furnace pipe by cracking furnace pipe feed inlet by feedstock device with feedstock oil and cracked,
Pass through chilled water (chw) water injection pipe injection cracking furnace pipe discharge port after metering from the chilled water (chw) of chilling water storage tank and pyrolysis product is direct
Contact cooling, pyrolysis product after cooling enter indirect quencher and are further cooled down, and enter product after cooling and separate and recover
Device.
13. technique as claimed in claim 12, 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 |
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