CN102732305A - Naphtha hydrogenation method and decoking tank - Google Patents
Naphtha hydrogenation method and decoking tank Download PDFInfo
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- CN102732305A CN102732305A CN2011100952877A CN201110095287A CN102732305A CN 102732305 A CN102732305 A CN 102732305A CN 2011100952877 A CN2011100952877 A CN 2011100952877A CN 201110095287 A CN201110095287 A CN 201110095287A CN 102732305 A CN102732305 A CN 102732305A
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Abstract
The invention discloses a naphtha hydrogenation method and a decoking tank. The naphtha hydrogenation method comprises the following steps of heating a mixture of a naphtha feedstock and hydrogen in a heating surface to a temperature required by hydrofining, then carrying out decoking by the decoking tank, and then feeding the decoked mixture into a fixed bed hydrogenation reactor. The decoking tank comprises a cylindrical body, an upper head, a lower head and a separation assembly. The separation assembly is a vertical filtration separation assembly and divides the decoking tank into two parts, wherein one part is an outflow channel of a filtered material and the other part is a coke deposition zone. Compared with the prior art, the naphtha hydrogenation method and the decoking tank can effectively and economically prolong a naphtha hydrogenation device running period.
Description
Technical field
The present invention relates to a kind of petroleum naphtha hydrogenation method and decoking jar, the decoking jar that specifically a kind of method of hydrotreating that prolongs petroleum naphtha hydrogenation device running period and this method are used.
Background technology
Petroleum naphtha (being gasoline fraction) is important gasoline stocks and industrial chemicals; Be mainly used in the Fuel Petroleum of producing the various trades mark; CR is produced aromatic hydrocarbons (or stop bracket gasoline blend component) raw material; Steam cracking or catalytic pyrolysis are produced industrial chemicals such as ethene, propylene, butylene, and the raw material etc. that is used to produce hydrogen.Petroleum naphtha generally derives from the virgin naphtha that petroleum distillation obtains, and the petroleum naphtha that secondary processing obtains is like coking naphtha, catalytic cracking petroleum naphtha, cracking naphtha etc.The various uses of various sources petroleum naphtha all need be with the sulphur in the raw material, nitrogen, rare hydrocarbon, metal impurities deep removal, and hydrogen addition technology is the optimum technology that removes various impurity in the feed naphtha at present.Produce stop bracket gasoline like catalytic cracking naphtha selective hydrogenation, the coking naphtha hydrogenation is produced steam crack material or hydrogen feedstock, and the preparatory hydrogenation of virgin naphtha is produced catalytic reforming raw material etc.
In the various hydrogen addition technologies of petroleum naphtha; What generally use is the fixed bed hydrogenation technology, the fixed bed hydrogenation beds promptly is set, in the hydrogenator under the unifining condition; Feed naphtha and hydrogen get into reactor drum from top; Carry out unifining through the hydrogenation catalyst bed and remove the various impurity in the raw material, the reaction product after making with extra care is discharged reactor drum from reactor bottom, carries out obtaining the hydrotreated naphtha product after the follow-up separation.
In the petroleum naphtha hydrogenation technology, the principal element of restriction hydrogenation unit LP steady running is the pressure drop rising rapid speed of fixed bed hydrogenation reactor, in general, when the pressure drop of hydrogenator reaches 0.3MPa, must stop work and handle.
For example concerning coking naphtha unifining technology,, often influence the operational stability of device owing to contain diolefine, tiny impurity such as coke powder in the raw material.Daqing petrochemical company 300kt/a coker gasoline hydrogenation unit is after the half a year that goes into operation, and it is too high to occur two subsystem pressure reduction continuously, causes compelled shut-down the (the pressure reduction rising analysis of causes of coking gasoline hydrogenation refining system and countermeasure, " oil refining and chemical industry ", the 19th volume: 20).The too fast problem of reactor catalyst bed pressure drop rising also appears in Guangzhou Branch 300kt/a hydrogenation unit when handling coker gasoline.This device once in the time of a year and a half, lacked (the analysis of causes and countermeasure that the hydrofining reaction system pressure drop raises, " China and foreign countries' energy ", 2007, the 12 volumes) 5 times because the reactive system bed pressure drop raises to cause stopping work disappearing.General 3～5 days needs of two I coker gasoline hydrogenation units of Anqing branch office oil refining clean a strainer; Hydrogenator will be stopped work in 1 year and cast aside for 2～3 times, has a strong impact on normal operation (coker gasoline hydrogenation scorch retarder, " petrochemical technology " of device; 2006,13 (4): 5).All there is similar problem in various degree in domestic and international device of the same type; The increase of pressure difference between bed; Make the inner members such as support bar and back up pad of catalyzer when bearing catalyst weight, again must the outer pressure of commitment, bring serious hidden danger for the safety operation of device.Therefore, it is the conspicuous contradiction that influences coking naphtha hydrogenation unit long-term operation that bed pressure drop rises too fast always, presses for and works out effective means, solves coking problem.
Above-mentioned coking naphtha hydrogenation unit similar problem also often appears in catalytic cracking petroleum naphtha hydrogenation device, virgin naphtha hydrogenation unit etc.; Be the hydrogenation unit running short period the high problem of reactor pressure falling-rising promptly to occur; Can only the stop work part catalyzer on purge reactor beds top goes into operation after the removable parts live catalyst again.
Petroleum naphtha hydrogenation device running practice shows that the rising of hydrogenator pressure drop all comes from the bed coking of catalyzer top.The coking factor is very complicated, is converted into mainly due to the polymerization of the unsaturated hydro carbons such as diolefine in the raw material and mechanical impurity that upstream device is brought into or impurity precursor to be deposited on beds top behind the settling and to cause.Diolefine in the raw material is being easy to take place polymerization, when particularly in raw material, containing other impurity such as oxygen, water, iron etc., is easier to polymerization coking.In the sample of coking, the content of general iron is also higher, possibly be to have formed naphthenic acid with organic hydrocarbon behind the raw oil dissolved oxygen; The iron of naphthenic acid corrosion device generates iron naphthenate; Stably be dissolved in the raw oil, iron naphthenate is easy to take place hydrogenolysis after mixing hydrogen, and is deposited on reactor drum top bed with hydrogen sulfide reaction generation Iron sulfuret; Promote the green coke reaction of coking parent, quickened the obstruction of beds.In addition, containing a spot of tiny coke powder and tiny mikrobe in some raw material also possibly be one of reason of some feed naphthas coking in hydrogenator.Because the petroleum naphtha source is varied; Introduced in the production of some feed naphtha, storage, the transportation and can't filter the impurity of removing through raw material; These impurity are oil-soluble sometimes, are the particulate that suspends sometimes, can't effectively remove through a kind of or simple several method.And the feed naphtha source of a hydrogenation unit is unfixing, often changes, and therefore, yet can not certain device is fixed as certain raw material of processing and use fixed to fall the impurity method.
The method that existing solution petroleum naphtha hydrogenation reactor drum step-down raises has following several kinds:
1, carries out the management work of raw material, adopt modes such as nitrogen protection, avoid raw material to contact, at utmost reduced unsaturated hydro carbons formation gelationus chance in the raw material with air.This is a kind of passive raw material guard method, if the raw material mechanical impurity of upper reaches input is more, diene content is very high, or carries a lot of coke powders secretly, and this method is then powerless.
2, mix artificial coal oil or diesel oil distillate, diluted the unsaturated hydro carbons such as diolefine in the raw material, reduced the severity of hydrogenation unit, make the device operation more stable.But this method has been sacrificed the amount of finish of hydrogenation device for treatment feed naphtha, has in fact reduced the air speed to feed naphtha, also will increase follow-up tripping device burden (existing tripping device can not meet the demands), and economy is relatively poor.
3, between the entrance and exit of pretreatment reaction device, by-pass is set; Reaction mass gets into process furnace after through the pretreatment reaction device during ordinary production; When the falling-rising of pretreatment reaction device catalyst bed stressor layer is high; Reaction mass gets into process furnace through by-pass, treats the pretreatment reaction device partly or entirely more behind the catalyst changeout, and reaction mass switches to the pretreatment reaction device again and gets into process furnace.Though this method can assurance device operation downtime not, raw material without pretreated situation under, can cause bigger impact to the main reactor temperature rise, make the difficult control of operation.The replacing of pretreatment catalyst simultaneously also can cause financial loss.The pretreatment reaction device is to adopt protective material bed deposition impurities in raw materials, and it is limited in one's ability to hold impurity, needs often to change the protective material in the pretreatment reaction device.
CN1109495A discloses a kind of Rifining method for catalylic cracking gasoline by adding hydrogen, and described is that the pre-sulfide catalyst of two different activities and variable grain diameter is connected.Adopt the mode of different catalysts grating to have certain effect, but effect is not outstanding for alleviating the coking of hydrogenation catalyst bed.US4; 113; 603 reports use two sections hydrofinishing process to handle diolefine and sulfide in the pyrolysis gasoline, and the catalyzer of first section nickeliferous-tungsten of use is removed mercaptan, and second section is used precious metals palladium catalyst to remove diolefine; This technology is comparatively complicated, and the coking with other factor can not play a role effectively for the etidine hydrocarbon.
Summary of the invention
To the deficiency of prior art, the decoking jar that the present invention provides a kind of petroleum naphtha hydrogenation method and this method to use can effectively guarantee the steady running of petroleum naphtha hydrogenation device, prolongs the running period of petroleum naphtha hydrogenation device.
Petroleum naphtha hydrogenation method of the present invention comprises the steps:
(1) mixture of feed naphtha and hydrogen is heated to the required temperature of unifining in process furnace;
(2) mixture of feed naphtha after the heating and hydrogen gets into the decoking jar;
(3) feed naphtha and the hydrogen through decoking jar decoking gets into fixed bed hydrogenation reactor; Feed naphtha and hydrogen is the Hydrobon catalyst bed through fixed bed hydrogenation reactor under the unifining condition, and the petroleum naphtha after the unifining separates with hydrogen discharge reactor drum and obtains hydrotreated naphtha.
Decoking jar wherein comprises cylindrical shell, upper cover, lower cover and separation assembly; Cylindrical shell and upper cover, lower cover are formed the decoking tank shell jointly; The upper cover top is provided with material inlet, and the lower cover bottom is provided with the material discharging hole, and the separation assembly structure is the vertical filtering separation assembly that is arranged on barrel one side; Vertical filtering separation assembly is made up of the incrustation agent of filling between two-layer screen cloth and the two-layer screen cloth; The both sides of vertical filtering separation assembly and decoking jar cylinder inboard wall are sealedly and fixedly connected, and the top of vertical filtering separation assembly is provided with cover plate, and the space that vertical filtering separation assembly, cover plate and decoking jar cylindrical shell form goes out passage for removing defocused streams; Above-mentioned removing on the decoking jar cylindrical shell that defocused streams goes out passage material outlet is set, removes defocused material and discharge the decoking jar from this material outlet.
In the inventive method, feed naphtha can be virgin naphtha, coking naphtha, catalytic cracking petroleum naphtha, cracking naphtha etc., also can be the mixture of two or more petroleum naphtha.It is 180～350 ℃ that petroleum naphtha hydrogenation purified condition is generally reactor inlet temperature, and reaction pressure is 0.5～12MPa, and volume space velocity is 0.5～20h during the liquid of feed naphtha
-1, hydrogen to oil volume ratio is 50:1～1500:1 (standard state), concrete reaction conditions can specifically be confirmed according to the specification of quality of product behind the character of feed naphtha and the hydrogenation.Hydrobon catalyst generally is carrier with the aluminum oxide, is the hydrogenation activity component with among W, Mo, Ni and the Co one or more, can also contain suitable auxiliary agent, and active ingredient is generally sulphided state in use, to improve the catalytic activity of catalyzer.
The decoking jar concrete structure that the inventive method is used comprises cylindrical shell, upper cover, lower cover and separation assembly; Cylindrical shell and upper cover, lower cover are formed the decoking tank shell jointly; The upper cover top is provided with material inlet; The lower cover bottom is provided with the material rinse mouth, and the separation assembly structure is the vertical filtering separation assembly that is arranged on barrel one side, and vertical filtering separation assembly is made up of the incrustation agent of filling between two-layer screen cloth and the two-layer screen cloth; The both sides of vertical filtering separation assembly and decoking jar cylinder inboard wall are sealedly and fixedly connected; The top of vertical filtering separation assembly is provided with cover plate, and the space that vertical filtering separation assembly, cover plate and decoking jar cylindrical shell form goes out passage for removing defocused streams, above-mentioned removing on the decoking jar cylindrical shell that defocused streams goes out passage material outlet is set.
In the decoking jar of the present invention, vertical filtering separation assembly is straight plate structure, also can be arc plate structure.Vertical filtering separation assembly is divided into two portions with the decoking jar, and a part is material flow pass after filtering, and a part is heavy Jiao Qu in addition, and the material flow pass is 1:9～5:5 with the ratio of the cross-sectional area of heavy Jiao Qu after filtering.General and the height such as decoking jar cylindrical shell grade of the height of vertical filtering separation assembly, vertical filtering separation assembly bottom can also can be sealed by opening.
In the decoking jar of the present invention, cylindrical shell is preferably cylindrical tube.The incrustation agent of filling in the middle of the vertical filtering separation assembly screen cloth is particle diameter 1.1～3mm; The filler of preferred 1.2 ~ 1.5mm; The material of filler can also can make spent hydroprocessing catalyst or useless hydrogenation catalyst for aluminum oxide, silicon oxide, pottery etc., and the thickness of filler is generally 10～200mm.Vertical filtering separation assembly upper end height is suitable with decoking jar cylindrical shell height.The ash mouth is let out in the bottom head setting of decoking jar, and cylindrical shell bottom, the heavy burnt district of decoking jar is provided with blows grey mouthful.Decoking jar upper cover material inlet below can be provided with the inlet diffuser of dispersed material, and inlet diffuser can be conventional taper or plywood structure etc.
During work; The feed naphtha of process process furnace heating has at high temperature gasified and has been gas phase; The petroleum naphtha of gasification and hydrogen mixture are from the material inlet of decoking jar upper cover, through inlet diffuser entering decoking jar, and vapor phase stream is through vertical filtering separation assembly, and the incrustation agent has suitable porosity; Gas passes the incrustation agent and gets into material flow pass after the filtration of separation assembly, flows out the decoking jar through material outlet.Solid impurity in the gaseous phase materials is trapped, and is deposited on the heavy Jiao Qu of decoking jar.Accumulation along with solid impurity; Vertical filter assemblies is mended solid impurity gradually and is flooded, and the decoking jar loses the decoking effect, this decoking jar of excision from system; Open and let out the ash mouth and blow the ash mouth; To blowing ash mouthful injecting compressed air or nitrogen, the solid coke powder in the decoking jar jar to be removed, the decoking jar behind the drainage solid coke powder can recover to use.Also can between the entrance and exit of decoking jar, pressure recorder be set, judge whether needs cleaning decoking jar according to the pressure drop rising situation of decoking jar.
Show through research; In the petroleum naphtha hydrogenation device; Though the reason that causes the hydrogenator pressure drop to raise fast is that the beds coking and fouling causes in the hydrogenator, these dirty thing overwhelming majority are not to carry out forming after the hydrogenation reaction through hydrogenation catalyst, but feed naphtha and hydrogen are after process furnace is heated to high temperature; Along with feed naphtha transfers gas phase to from liquid phase; The coking precursor assemble to transform owing to can't gasify gradually, finally becomes burnt shape solid matter, and these burnt shape solid matters are under gaseous stream conveying effect in the entering hydrogenator; Be deposited in the beds, and then the blocking catalyst bed causes hydrogenator pressure drop rising.Show that through a large amount of experiments petroleum naphtha and hydrogen are heated to the coking material that forms in the high-temperature gasification process, with the heating before be diverse material, can't address this problem through the filtration of raw material.Simultaneously, these coking materials are easy to deposition, in the deposition equipment of suitable structure, can effectively separate.Adopt decoking jar of the present invention, after the gaseous stream of entrained solids impurity gets into the decoking jar, because circulation area enlarges; Gas flow rate reduces, and the solid impurity particle drops down onto the decoking pot bottom fast owing to inertia effect and deposits, and can not brought in the deposition agent of the vertical filtering separation assembly of decoking jar by the gas phase major part; Because this moment, the gas phase flow velocity was slower; Gas phase is separated with the fluidised form of solid impurity, and therefore, separation assembly can not stop up inefficacy fast; Only can constantly rise with settling and bury vertical filtering separation assembly and partial failure, the work-ing life of this decoking jar is very long.The present invention is provided with the suitable incrustation decoking jar of structure through the mechanism of the above-mentioned petroleum naphtha hydrogenation process of research coking, has designed rational petroleum naphtha hydrogenation technical process, can effectively solve hydrogenator short problem running period in the petroleum naphtha hydrogenation technology.
Simple in structure, characteristics such as occupation of land is little, no-rotary part, space utilization is abundant, the solid impurity deposition is big, less investment that decoking jar of the present invention has are very suitable to the solid impurity separation through material behind the process furnace in the petroleum naphtha hydrogenation technology.
Description of drawings
Fig. 1 is the decoking jar structure synoptic diagram that the present invention uses;
Fig. 2 is Fig. 1 middle section A-A structural representation;
Fig. 3 is Fig. 1 middle section B-B structural representation.
Wherein: 1-material inlet, 2-inlet diffuser, 3-upper cover, 4-material outlet, the vertical filtering separation assembly of 5-, 6-cylindrical shell, 7-blow the ash mouth, and 8-exit collector, 9-material discharging hole, 10-skirt, 11-are let out ash mouth, 12-lower cover.
Embodiment
Further specify the technology contents of the inventive method and decoking jar below in conjunction with accompanying drawing, and further specify the technique effect of the inventive method through embodiment.
Between process furnace and the hydrogenator of petroleum naphtha hydrogenation process method of the present invention in existing petroleum naphtha hydrogenation technology decoking jar as shown in Figure 1 is set, other content need not change basically.As shown in Figure 1; The decoking jar constitutes body skin by upper cover 3, cylindrical shell 6 and lower cover 12, and upper cover 3 tops are provided with material inlet 1, material inlet 1 bottom inlet porting scatterer 2; Lower cover 12 bottoms are provided with exit collector 8, and exit collector 8 communicates with material discharging hole 9.Vertical filtering separation assembly 5 is vertically set in the decoking jar cylindrical shell 5, and vertical filtering separation assembly 5 is that the agent of the inner filling of two-layer screen cloth incrustation constitutes.Ash mouth 11 is let out in the setting of decoking jar lower cover bottom, and decoking jar cylindrical shell 6 bottoms are provided with blows ash mouth 7.Whole decoking jar is fixed on the workplace through skirt 10.
Further specify the result of use of the inventive method and decoking jar below through embodiment.The decoking jar structure that embodiment uses is: cylindrical shell aspect ratio 5 (height and diameter ratio); Incrustation agent thickness in the vertical filtering separation assembly is 50mm; The incrustation agent is the alumina globule of 1.5mm; Vertical filtering separation assembly is divided into two portions with cylindrical shell, and the material flow pass is 2:8 with the ratio of the cross-sectional area of heavy Jiao Qu after promptly filtering.
Embodiment 1 and comparative example 1
The coking naphtha hydrogen refining process.Coking naphtha mixes with hydrogen through process furnace and is heated to 230 ℃, gets into hydrogenator after getting into decoking jar decoking.Hydrogenation catalyst FH-40A is the commercial Hydrobon catalyst of Sinopec Fushun Petrochemical Research Institute development and production.Feedstock property is seen table 1, and operational condition and result see table 2.The difference of comparative example is not for being provided with the decoking jar.
Table 1 raw oil character.
| Raw material | Coking naphtha |
| The boiling range scope, ℃ | 36～192 |
| Sulphur, μ g/g | 4960 |
| Nitrogen, μ g/g | 126 |
| The bromine valency, gBr/ (100mL) | 48 |
Table 2 operational condition and product property.
| ? | Embodiment 1 | Comparative example 1 |
| The reaction hydrogen pressure, MPa | 4.0 | 4.0 |
| Hydrogen to oil volume ratio | 800:1 | 800:1 |
| Volume space velocity, h -1 | 2.0 | 2.0 |
| Reactor inlet temperature, ℃ | 230 | 230 |
| Hydrogenation catalyst | FH-40A | FH-40A |
| Reactor pressure decrease, MPa (30 days) | 0.10 | 0.12 |
| Reactor pressure decrease, MPa (60 days) | 0.10 | 0.20 |
| Reactor pressure decrease, MPa (90 days) | 0.10 | 0.28 |
| Reactor pressure decrease, MPa (100 days) | 0.10 | Stop work |
Can find out that from above-mentioned contrast the inventive method can solve the pressure drop rising problem of coking naphtha hydrogenation unit, can effectively prolong the running period of hydrogenation unit.
Catalytic cracking heavy naphtha selective hydrogenation desulfurization process.The catalytic cracking petroleum naphtha adopts commodity AFS-12 catalyzer (University of Petroleum's production), at pressure 0.5MPa, 35 ℃～45 ℃ of temperature, volume space velocity 2.0h
-1, carry out deodorization under gas and oil volume ratio (air/gasoline) the 4:1 condition.The deodorization product is through fractionation, and cut point is 70 ℃ and obtains catalytic cracking heavy naphtha, and catalytic cracking heavy naphtha mixes with hydrogen through process furnace and is heated to 250 ℃, gets into hydrogenator after getting into decoking jar decoking.Hydrogenation catalyst FGH-11 is the commercial catalyst for selectively hydrodesulfurizing of Sinopec Fushun Petrochemical Research Institute development and production.Feedstock property is seen table 3, and operational condition and result see table 4.The difference of comparative example is not for being provided with the decoking jar.
Table 3 catalytic cracking heavy naphtha main character.
| Raw material | The last running of catalytic cracking petroleum naphtha |
| Sulphur content, μ g/g | 900 |
| Olefin(e) centent, v% | 22 |
| RON, RON | 91.0 |
| Boiling range, ℃ (over point～final boiling point) | 58～179 |
Table 4 operational condition and result.
| ? | |
Comparative example 2 |
| The reaction hydrogen pressure, MPa | 1.6 | 1.6 |
| Hydrogen to oil volume ratio | 300:1 | 300:1 |
| Volume space velocity, h -1 | 2.0 | 2.0 |
| Reactor inlet temperature, ℃ | 250 | 250 |
| Hydrogenation catalyst | FGH-11 | FGH-11 |
| Reactor pressure decrease, MPa (5 days) | 0.09 | 0.15 |
| Reactor pressure decrease, MPa (10 days) | 0.09 | 0.20 |
| Reactor pressure decrease, MPa (20 days) | 0.09 | Stop work |
| Reactor pressure decrease, MPa (50 days) | 0.09 | ? |
Virgin naphtha is hydrogenated to CR in advance and supplies raw materials.Virgin naphtha mixes with hydrogen through process furnace and is heated to 300 ℃, gets into hydrogenator after getting into decoking jar decoking.Hydrogenation catalyst FH-40C is the commercial Hydrobon catalyst of Sinopec Fushun Petrochemical Research Institute development and production.Feedstock property is seen table 5, and operational condition and result see table 6.The difference of comparative example is not for being provided with the decoking jar.
Table 5 virgin naphtha main character.
| Raw material | Virgin naphtha |
| The source | Mix virgin naphtha |
| Density (20 ℃), g/cm 3 | 0.7348 |
| Sulphur content, μ g/g | 800 |
| Nitrogen content, μ g/g | 2.8 |
Table 6 operational condition and result.
| | Embodiment | 3 | Comparative example 3 |
| Reaction pressure, MPa | 1.6 | 1.6 | |
| Temperature of reaction, ℃ | 300 | 300 | |
| Volume space velocity, h -1 | 6.0 | 6.0 | |
| Hydrogen-oil ratio, Nm 3/m 3 | 100 | 100 | |
| Oil property | Treated oil | Treated oil | |
| Sulphur content, μ g/g | <0.5 | <0.5 | |
| Nitrogen content, μ g/g | <0.5 | <0.5 | |
| Hydrogenation catalyst | FH-40C | FH-40C | |
| Reactor pressure decrease, MPa (30 days) | 0.11 | 0.15 | |
| Reactor pressure decrease, MPa (60 days) | 0.11 | 0.20 | |
| Reactor pressure decrease, MPa (100 days) | 0.11 | 0.26 | |
| Reactor pressure decrease, MPa (120 days) | 0.11 | Stop work |
Can find out that through embodiment through using the decoking jar of suitable structure, the pressure drop of petroleum naphtha hydrogenation reactor drum is not risen basically, can estimate, can not stop work because of problem of pressure drop in work-ing life at catalyzer.
Claims (10)
1. a petroleum naphtha hydrogenation method is characterized in that comprising the steps:
(1) mixture of feed naphtha and hydrogen is heated to the required temperature of unifining in process furnace;
(2) mixture of feed naphtha after the heating and hydrogen gets into the decoking jar;
(3) feed naphtha and the hydrogen through decoking jar decoking gets into fixed bed hydrogenation reactor; Feed naphtha and hydrogen is the Hydrobon catalyst bed through fixed bed hydrogenation reactor under the unifining condition, and the petroleum naphtha after the unifining separates with hydrogen discharge reactor drum and obtains hydrotreated naphtha;
Decoking jar wherein comprises cylindrical shell, upper cover, lower cover and separation assembly; Cylindrical shell and upper cover, lower cover are formed the decoking tank shell jointly; The upper cover top is provided with material inlet, and the lower cover bottom is provided with the material discharging hole, and the separation assembly structure is the vertical filtering separation assembly that is arranged on barrel one side; Vertical filtering separation assembly is made up of the incrustation agent of filling between two-layer screen cloth and the two-layer screen cloth; The both sides of vertical filtering separation assembly and decoking jar cylinder inboard wall are sealedly and fixedly connected, and the top of vertical filtering separation assembly is provided with cover plate, and the space that vertical filtering separation assembly, cover plate and decoking jar cylindrical shell form goes out passage for removing defocused streams; Above-mentioned removing on the decoking jar cylindrical shell that defocused streams goes out passage material outlet is set, removes defocused material and discharge the decoking jar from this material outlet.
2. according to the described method of claim 1, it is characterized in that: feed naphtha is virgin naphtha, coking naphtha, catalytic cracking petroleum naphtha, cracking naphtha, or the mixture of two or more petroleum naphtha.
3. according to the described method of claim 1, it is characterized in that: petroleum naphtha hydrogenation purified condition is that reactor inlet temperature is 180～350 ℃, and reaction pressure is 0.5～12MPa, and volume space velocity is 0.5～20h during the liquid of feed naphtha
-1, hydrogen to oil volume ratio is 50:1～1500:1.
4. decoking jar; It is characterized in that: the decoking jar structure comprises cylindrical shell, upper cover, lower cover and separation assembly; Cylindrical shell and upper cover, lower cover are formed the decoking tank shell jointly, and the upper cover top is provided with material inlet, and the lower cover bottom is provided with the material rinse mouth; The separation assembly structure is the vertical filtering separation assembly that is arranged on barrel one side; Vertical filtering separation assembly is made up of the incrustation agent of filling between two-layer screen cloth and the two-layer screen cloth, and the both sides of vertical filtering separation assembly and decoking jar cylinder inboard wall are sealedly and fixedly connected, and the top of vertical filtering separation assembly is provided with cover plate; The space that vertical filtering separation assembly, cover plate and decoking jar cylindrical shell form goes out passage for removing defocused streams, above-mentioned removing on the decoking jar cylindrical shell that defocused streams goes out passage material outlet is set.
5. according to the described decoking jar of claim 4, it is characterized in that: in the decoking jar of the present invention, vertical filtering separation assembly is straight plate structure, or arc plate structure.
6. according to claim 4 or 5 described decoking jars; It is characterized in that: vertical filtering separation assembly is divided into two portions with the decoking jar; A part is material flow pass after filtering, and a part is heavy Jiao Qu in addition, and the material flow pass is 1:9～5:5 with the ratio of the cross-sectional area of heavy Jiao Qu after filtering.
7. according to the described decoking jar of claim 4, it is characterized in that: the height of vertical filtering separation assembly and height such as decoking jar cylindrical shell grade, vertical filtering separation assembly bottom opening or sealing.
8. according to the described decoking jar of claim 4, it is characterized in that: the incrustation agent of filling in the middle of the vertical filtering separation assembly screen cloth is the filler of particle diameter 1.1～3mm.
9. according to the described decoking jar of claim 8, it is characterized in that: the material of filler is aluminum oxide, silicon oxide, pottery, perhaps makes spent hydroprocessing catalyst or useless hydrogenation catalyst, and the thickness of filler is 10～200mm.
10. according to the described decoking jar of claim 4, it is characterized in that: the ash mouth is let out in the bottom head setting of decoking jar, and cylindrical shell bottom, the heavy burnt district of decoking jar is provided with blows grey mouthful.
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