CN101445744A - Method for removing coke powder in raw oil and device thereof - Google Patents
Method for removing coke powder in raw oil and device thereof Download PDFInfo
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- CN101445744A CN101445744A CNA2008102078310A CN200810207831A CN101445744A CN 101445744 A CN101445744 A CN 101445744A CN A2008102078310 A CNA2008102078310 A CN A2008102078310A CN 200810207831 A CN200810207831 A CN 200810207831A CN 101445744 A CN101445744 A CN 101445744A
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Abstract
The invention relates to a method for removing coke powder from raw oil and a device thereof and provides the method for removing the coke powder from the raw oil. The method comprises the following steps: cyclone separation is carried out on the raw oil containing the coke powder at the temperature of 40-600 DEG C to obtain the purified raw oil and sump oil containing the coke powder; and the sump oil containing the coke powder is deposited or filtered to obtain further recycled concentrated sump oil rich in coke powder. The invention also provides the device for removing the coke powder from the raw oil.
Description
Technical field
The invention belongs to refining of petroleum clearer production technology field, relate to a kind of coke powder raw material oil treatment process that contains, specifically, the coker gasoline, diesel oil, the wax oil that relate in a kind of petrochemical complex delayed coking production process contain the treatment process of coke powder, and implement the used device of this method.
Background technology
Delayed coking is the important process process of heavy oil lighting in the refinery oil secondary processing, and coking product-coker gasoline, coker gas oil and the wax tailings etc. of this process are owing to the characteristics of delayed coking contain coke powder.After these coke powders enter follow-up refining plant with coking raw material oil, at the catalyst for refining surface deposition, thereby make catalyst bed stressor layer falling-rising height, phenomenons such as beds is built bridge, bias current finally cause catalyst deactivation; When coke powder enters high pressure heat exchanger, the high pressure heat exchanger fouling is stopped up, influence the heat exchange effect, the cleaning of must stopping work in the time of seriously, thus shortened the on-stream time of whole device.
It is at present, relatively commonly used in the world that to remove the coke powder form be the automatic backwash filtration method.This system comprises two groups of backwash filters, oil skimming tank, a gas-holder and filters Controlling System.When wherein one group during at back flushing or holding state, another is organized in works better.After this device put into operation, strainer frequently switched, and often stopped transport automatically because of strainer pressure reduction superelevation, and it is undesired that strainer moves always.As seen, strainer and blowback system general effect thereof are unsatisfactory.
In recent years, lot of domestic and international units is studied stock oil decoking powder in succession, and major technique has gravity settling, filtration etc.This two kind equipment all has employing in oil product decoking powder process, advantage is arranged, but also have wretched insufficiency.Most importantly not according to the rerum natura characteristics, especially coke powder is easy to the characteristic of adhesion and aggregation, designs targetedly.
Up to now, this area is still untapped, and to go out the plant investment cost low, and volume is little, the reliability height, and the pressure-losses is little, and cycle of operation is long and separation efficiency is high, has saved material and has improved the new stock oil decoking powder method of the comprehensive utilization ratio of resource.
Therefore, this area presses for a kind of new stock oil decoking powder method with above-mentioned advantage of developing.
Summary of the invention
It is that the combined method of core and other isolation technique removes the coke powder in the stock oil that the present invention adopts cyclone separation process, developed a kind of new stock oil eddy flow decoking powder method, overcome that domestic and international existing gravity settler, strainer etc. handle that the plant investment that coke powders exist is big, complicated operation, running cost height, can not long-term operation etc. defective, thereby solved problems of the prior art.
On the one hand, the invention provides a kind of method that removes coke powder in the stock oil, this method may further comprise the steps:
The stock oil that contains coke powder to 40-600 ℃ carries out cyclonic separation, stock oil that is purified and the sump oil that contains coke powder; And
The described sump oil that contains coke powder is carried out sedimentation or filtration, the sump oil of the spissated enrichment coke powder of further being recycled.
One preferred embodiment in, the described coke powder content that contains the stock oil of coke powder is 500-30000mg/L, the coke powder particle diameter is 1-80 μ m.
Another preferred embodiment in, the coke powder content of the stock oil of described purification is not more than 300mg/L, and particle diameter is not less than 90% greater than the clearance of the coke powder of 15 μ m.
Another preferred embodiment in, this method also comprises: the stock oil to described purification carries out secondary filter, the stock oil that is further purified.
Another preferred embodiment in, the coke powder content of the stock oil of described further purification is not more than 100mg/L.
On the other hand, the invention provides a kind of device that removes coke powder in the stock oil, this device comprises:
Cyclone separator, the stock oil that contains coke powder that is used for 40-600 ℃ carries out cyclonic separation, stock oil that is purified and the sump oil that contains coke powder; And
The slurry tank or the strainer that are connected with the underflow opening of described cyclone separator are used for the described sump oil that contains coke powder being carried out sedimentation or filtration, the sump oil of the spissated enrichment coke powder of further being recycled.
One preferred embodiment in, this device also comprises: with the accurate filter that the overflow port of described cyclone separator is connected, be used for the stock oil of described purification being carried out secondary filter, the stock oil that is further purified.
Another preferred embodiment in, the pressure between the stock oil import that contains coke powder of this device and the material oil outlet of purification falls and is no more than 0.15MPa.
Another preferred embodiment in, the flow of the underflow opening of described cyclone separator is the 2-15% of its inlet flow rate, the sump oil rate of discharge of the spissated enrichment coke powder of described slurry tank or strainer is the 0.1-3% of its inlet flow rate.
Another preferred embodiment in, described cyclone separator is made up of cyclone pipe; This cyclone pipe is composed in parallel by one or more micro vortex flow tubes, the material oil outlet chamber of a shared feed cavity, a coke powder outlet plenum and a purification, and wherein, described feed cavity is independent container or the unitary part in the container.
Description of drawings
Fig. 1 shows structure and the principle of work according to stock oil decoking powder cyclonic separation equipment of the present invention.
Fig. 2 shows according to stock oil decoking powder craft flow process of the present invention.
Fig. 3 is 800,000 tons of/year synoptic diagram of urging the technical process of burnt bavin device coke powder tripping device of 1,000 ten thousand tons/year of CNPC Dushanzi petrochemical industry oil refining according to an embodiment of the invention.
Embodiment
The present inventor finds that after having passed through extensive and deep research the cyclone separator volume is little, velocity of separation is fast, Operation and Maintenance is simple, is a kind of new and effective, energy-conservation separating device; Adopt cyclone separation process be core and other isolation technique (for example, sedimentation, filtration) the combined coke powder that removes in the stock oil, can overcome that existing gravity settler, strainer etc. handle that the plant investment that coke powders exist is big, complicated operation, running cost height, can not long-term operation etc. defective, it is low to have the plant investment cost, volume is little, the reliability height, and the pressure-losses is little, cycle of operation is long and separation efficiency is high, has saved material and has improved the advantage of the comprehensive utilization ratio of resource.Based on above-mentioned discovery, the present invention is accomplished.
In a first aspect of the present invention, the purifying treatment method that removes coke powder in a kind of stock oil is provided, it is that the combined method of assisting is handled the coke powder in 40-600 ℃ the stock oil and other solid particulate that this method adopts cyclone separation process or cyclonic separation and other isolation technique, and the stock oil after the purification can directly enter downstream unit or can further enter downstream unit after the processing by accurate filter; The water of separating, coke powder mixture further concentrate the defocusing of sump oil of back enrichment coke powder or other through slurry tank or strainer and install and fully utilize.
Preferably, the inventive method adopts first class purification clarification, the spissated separation design of secondary sump oil, be that the first step adopts stock oil decoking powder cyclone separator that stock oil is separated, stock oil after the purification or process accurate filter remove follow up device, after the containing the coke powder sump oil and pass through slurry tank or strainer concentrating and separating again of small part, recovery part stock oil, the sump oil of enrichment enrichment coke powder return other device and utilize.This design has reduced the refining losses that contains the coke powder sump oil, has reduced power consumption of polymer processing.
Preferably, the sump oil of the enrichment coke powder after the partial slurry tank of the inventive method or strainer separate can adopt the sump oil variable frequency pump to extract out and send outside containing the coke powder sump oil, control simple and energy consumption low.
Preferably, the inventive method changes or coke powder content when sharply increasing significantly at material flow, all can steady running.
Preferably, the inventive method stock oil of having purified in the decoking powder has effectively prolonged work-ing life of downstream unit catalyzer, has improved the transformation efficiency of follow up device.
Preferably, the stock oil of the purification after the inventive method is handled removes follow up device, contains the sump oil reuse of coke powder.
In a second aspect of the present invention, the purifying processing device that removes coke powder in a kind of stock oil is provided, this device comprises the combination of cyclone separator or cyclone separator and slurry tank or strainer.
Preferably, the nucleus equipment of apparatus of the present invention is a stock oil decoking powder cyclone separator, it mainly relies on continuously-disperses the density difference between the two-phase, utilize the centrifugal force of fluid high speed rotating in cyclone pipe that coke powder, water are separated from stock oil, both can also can dewater and other solid particulate by the decoking powder.
Preferably, the imported raw material oil temperature of described stock oil coke powder tripping device is 40-600 ℃, and coke powder content is 500-30000mg/L, and the particle diameter of coke powder is 1-80 μ m.
Preferably, the content of coke powder is lower than 300mg/L in the described stock oil coke powder tripping device self-cleaning oil outlet stock oil, is not less than 90% greater than the coke powder clearance of 15 μ m.
Preferably, the present invention at first adopts stock oil decoking powder cyclone separator that stock oil is handled, and stock oil can directly remove follow up device or remove follow up device through accurate filter after the purification that overflows; The coke powder sump oil that contains that underflow comes out goes slurry tank or strainer further to handle; Stock oil return mechanism inlet after slurry tank or strainer separate is handled or is directly removed follow up device, need carry out containing coke powder concentration in the off-line test stock oil and decides; Concentrate defocusing of sump oil or other device reuse of back enrichment coke powder, can adopt intermittently or the successive discharging modes.
Preferably, separation of the present invention is to adopt cyclonic separation and sedimentation to protect the coke powder that filters in the combined method separate raw materials oil under the prerequisite of not adding any additives, has reduced running cost, can improve separating effect simultaneously, do not need other utility appliance, the decoking powder dewaters simultaneously; Compare with automatic backwashing filter and need not diesel oil and soak recoil, do not produce other waste.
Preferably, the pressure between outlet of the oil phase of apparatus of the present invention and the import falls and is not more than 0.15MPa, is lower than the energy consumption of using back-flushing filter.
Preferably, the flow of the stock oil decoking powder cyclone separator coke powder phase of apparatus of the present invention can be regulated continuously, flow range 0-15%, regulative mode are according to operating experience and off-line concentration analysis result, adopt adjusting decoking powder cyclone separator outlet at bottom valve to realize.
Preferably, the nucleus equipment of apparatus of the present invention-stock oil decoking powder cyclone separator is integrated by several cyclone pipes, and cyclone pipe quantity is determined by treatment capacity.Cyclone pipe mainly partly is made up of separation cone, tail pipe and overflow port etc.The stock oil that contains coke powder carries out high speed rotating from the inside that the cyclone pipe import tangentially enters cyclone pipe under certain pressure effect, after separation cone because of the change of cross section of fluid channel, make liquid stream speedup and form the spiral fluidised form, further dwindling after liquid enters tail cone because of cross section of fluid channel, swirl velocity continues to increase, formed a stable centrifuge field in the inside of separator, liquid is agglomerated into the liquid core of light constituent in the central section of Taper Pipe, discharge from overflow port, coke powder is coalescent discharges from underflow opening, thereby realizes that coke powder separates with fluidic.
Preferably, the cyclone pipe of apparatus of the present invention can be composed in parallel by one or more micro vortex flow tubes, a shared feed cavity, a coke powder outlet plenum, a purification material oil outlet chamber; Described feed cavity can be independent container, also can be a unitary part in the container, with the structure of simplification production equipment, and according to producing the actual adjustment of making some parameter of structure design, reaches good separating effect.
Preferably, can be according to actual coke powder amount and required definite one-level, secondary or the multistage decoking powder cyclone separator of adopting of separating effect of containing of stock oil.
Preferably, the stock oil decoking powder cyclone separator underflow rate of discharge of apparatus of the present invention is the 2-15% of device inlet flow rate, the rate of discharge of slurry tank or strainer enrichment coke powder sump oil is the 0.1-3% of device inlet flow rate, and flow is decided according to the amount that contains coke powder in the device imported raw material oil.
Preferably, apparatus of the present invention outlet sump oil quantity discharged realizes by the work of regulating outlet valve or control outlet variable frequency pump.
Preferably, apparatus of the present invention are set up slurry tank or strainer after stock oil decoking powder cyclone separator sump oil outlet (underflow opening) purpose is to contain the coke powder sump oil and further concentrate in order to make, and reclaims stock oil, reduces the loss of stock oil.
Preferably, setting up accurate filter behind apparatus of the present invention stock oil self-cleaning oil (overflow port) is further to be reduced to 100mg/L or lower in order to contain the coke powder amount in the stock oil that makes purification, needs to decide according to stock oil processing unit (plant) practical situation.
Preferably, apparatus of the present invention adopt the means of differential pressure control to make stock oil decoking powder cyclone separator remain on the operation of efficient district.
Below referring to accompanying drawing.
Fig. 1 shows structure and the principle of work according to stock oil decoking powder cyclonic separation equipment of the present invention.As shown in Figure 1, cyclonic separation equipment of the present invention comprises a plurality of cyclone pipes 11, and this equipment is provided with liquidometer 12 to observe the change of stock oil liquid level; The stock oil that contains coke powder is entered by equipment importation, stock oil that after cyclonic separation is handled, is purified and the sump oil that contains coke powder, and this outlet that contains the sump oil slave unit of coke powder is discharged.
Fig. 2 shows according to stock oil decoking powder craft flow process of the present invention.As shown in Figure 2, containing coke powder stock oil at first handles by stock oil decoking powder cyclone separator 1, whether the stock oil of the purification that overflows can remove follow up device through accurate filter 3, need accurate filter 3 to decide according to stock oil character and technical requirements index; The sump oil that contains coke powder that underflow comes out goes slurry tank or strainer 2 further to handle; Stock oil return mechanism inlet after slurry tank or strainer 2 separates is handled or is directly removed follow up device, need carry out containing coke powder concentration in the off-line test stock oil and decides; Concentrate defocusing of sump oil or other device reuse of back enrichment coke powder.
Major advantage of the present invention is:
(1) floor space is little.The floor space of single complete equipment is less than accurate back-flushing filter, and need not one opens one and be equipped with two equipment and switch and use, so floor space compares less.
(2) separation efficiency height.The decoking powder dewaters and other solid particle polluter simultaneously.
(3) back flushing, easy care, the no any generation of waste materials of need not simple to operate, working cost is low.When material flow changes or coke powder content when sharply increasing significantly, all can steady running.
(4) little, the pressure of the pressure-losses falls stable.
(5) apparatus structure is simple, and shock resistance is strong, and the reliability height can long-term operation.
Embodiment
Further set forth the present invention below in conjunction with specific embodiment.But, should be understood that these embodiment only are used to the present invention is described and do not constitute limitation of the scope of the invention.The test method of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.Except as otherwise noted, all per-cent and umber are by weight.
1,000 ten thousand tons of/year oil refining of CNPC's Dushanzi petrochemical industry are urged burnt bavin device coke powder tripping device for 800,000 tons
The fluid properties 1-2 that sees the following form:
Table 1, raw material are formed and character
| Type of feed | Coker gasoline | Coker gas oil | Catalytic diesel oil | The simulation mixing raw material |
| 20 ℃ of density, g/m 3 | 0.72 | 0.84 | 0.8777 | 0.8201 |
| Sulphur content, ppm wt | 2654 | 4876 | 7300 | 5111 |
| Nitrogen content, ppm wt | 157 | 1831 | 846 | 1159 |
| Cetane value | 46 | 33 | ||
| Total aromatic hydrocarbons, w% | 10 | 28 | 52 | 31.2 |
| Polycyclic aromatic hydrocarbons, w% | 14 | 24 | 13.9 | |
| Flash-point, ℃ | 56 | |||
| Viscosity, cp | 0.38 | 0.66 | 1.55 | 0.63 |
| Initial boiling point/5%10%/30% 50%/70% 90%/95% final boiling point content % | 48/58 63/86 110/135160/171183 21.57 | 131/186212/240264/290324/337350 45.74 | 160/ 203.5/223 248.5/285.5329/ 355 32.69 | 55/ 119/196236/274319/ 350/ |
Table 2 operational condition
| Main project | Unit | Numerical value | Remarks |
| Flow rate | kg/h | 103107 | Maximum 113418 |
| Density (80 ℃) | kg/m 3 | 785 | |
| Temperature | ℃ | 80 | |
| Pressure | MPa(G) | 0.8 | The highest by 1.6 |
| Pressure reduction during normal running | MPa(G) | <0.15 | |
| Coke powder content | ppm | 6000 | Iron sulphide, coke powder |
Embodiment:
Adopt the method for cyclonic separation and gravity settling to urge Jiao Chaide stock oil to handle to 800,000 tons/year of Dushanzi.At first by stock oil decoking powder swirler stock oil is handled, stock oil removes follow up device after the purification that overflows; The coke powder sump oil that contains that underflow comes out goes slurry tank further to handle, and the stock oil after the part of slurry tank is separated directly removes follow up device, and the sump oil that concentrates back enrichment coke powder is extracted out through frequency conversion sump pump 23.Fig. 3 is seen in technical process.The technical process explanation:
(a) coke powder separator 21 is separated into coke powder phase and oil phase with raw material.Pressure between oil phase outlet and the import falls and is not more than 0.15MPa, coke powder export mutually and import between pressure fall and be not more than 0.1MPa.The sump pump outlet is provided with a line of return (get rid of pump and pay line), and start of run can utilize this line examination that sump pump is got rid of, and directly by the pressure of slop oil tank 22, sump oil is sent outside; When two sump pump simultaneous faults, also can realize when the pressure of slop oil tank 22 is higher.The flow of coke powder phase can be regulated continuously by under meter 25, and flow range 0-5%, regulative mode are according to operating experience and off-line concentration analysis result, adopts frequency conversion sump pump 23 to realize.
(b) slop oil tank 22 bands are pressed operation, because there is density difference in the sump oil component, light oil is stored in tank deck all the time, native system is provided with a return line, rely on self pressure, reclaim the light oil (determining to open and close size according to the sampling analysis result) of sump oil tank deck, wherein the light oil of returning returns the swirler inlet or directly removes follow up device.
(c) coke powder band oil, deposition easily.Coke powder can not be oversize in the residence time of slop oil tank 22, otherwise stifled jar.Therefore, even sump pump intermittently starts, pitch time is unsuitable oversize, and this gap length need be debugged definite.Sump pump is continuous operation or is interrupted running, and the size of flow need be determined according to the coke powder content debugging in the device stock oil.
(d) slop oil tank 22 liquid levels pass Central Control Room.23 controls of frequency conversion sump pump adopt the difference of coke powder separator 21 intake pressures and slop oil tank 22 pressure to control, and operation is monitored by Central Control Room.
(e) move continuously when sump pump, the flow of sump pump is the flow of coke powder phase.When the sump pump intermitten service, this state need be opened return line, and the flow of this pipeline is the flow of coke powder phase.
(f) standard-sized sheet in normal operation of the valve between coke powder separator 21 and the slop oil tank 22 avoids coke powder to stop up.The flow of sump oil phase is controlled by 23 controls of sump oil variable frequency pump or by the valve of return line.
(g) this system is provided with 3 sampling points, and slop oil tank 22 inlet sampling points are used for monitoring the coke powder content of separator sump oil in mutually; Sampling point on slop oil tank 22 return lines is used for monitoring the coke powder content of slop oil tank 22 top sump oils; Sampling point on the sump pump egress line is used for monitoring the coke powder content of the sump oil of slop oil tank 22 primary outlets.
(h) coke powder separator 21 and slop oil tank 22 tank decks all design the liquid drop-out line to installing the lp venting system, and under normal circumstances, this line is in closing condition; Coke powder separator 21 and slop oil tank 22 tank decks are established safety valve, unload press liquid and connect device blow-down tank 24.
Implementation result:
Stock oil coke powder tripping device purifies the coke powder concentration of material oil outlet less than 300mg/L, all removes greater than the coke powder particle of 30 μ m.Pressure drop≤0.1MPa between the stock oil oil export of stock oil import of coke powder separator and purification.The flow that contains the coke powder sump oil of slop oil tank is the 1-4% of imported raw material oil flow.
All quote in this application as a reference at all documents that the present invention mentions, just quoted as a reference separately as each piece document.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after having read above-mentioned teachings of the present invention, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (10)
1. method that removes coke powder in the stock oil, this method may further comprise the steps:
The stock oil that contains coke powder to 40-600 ℃ carries out cyclonic separation, stock oil that is purified and the sump oil that contains coke powder; And
The described sump oil that contains coke powder is carried out sedimentation or filtration, the sump oil of the spissated enrichment coke powder of further being recycled.
2. the method for claim 1 is characterized in that, the described coke powder content that contains the stock oil of coke powder is 500-30000mg/L, and the coke powder particle diameter is 1-80 μ m.
3. method as claimed in claim 1 or 2 is characterized in that, the coke powder content of the stock oil of described purification is not more than 300mg/L, and particle diameter is not less than 90% greater than the clearance of the coke powder of 15 μ m.
4. method as claimed in claim 1 or 2 is characterized in that, this method also comprises: the stock oil to described purification carries out secondary filter, the stock oil that is further purified.
5. method as claimed in claim 4 is characterized in that, the coke powder content of the stock oil of described further purification is not more than 100mg/L.
6. device that removes coke powder in the stock oil, this device comprises:
Cyclone separator (1), the stock oil that contains coke powder that is used for 40-600 ℃ carries out cyclonic separation, stock oil that is purified and the sump oil that contains coke powder; And
The slurry tank or the strainer (2) that are connected with the underflow opening of described cyclone separator (1) are used for the described sump oil that contains coke powder being carried out sedimentation or filtration, the sump oil of the spissated enrichment coke powder of further being recycled.
7. device as claimed in claim 6 is characterized in that, this device also comprises: with the accurate filter (3) that the overflow port of described cyclone separator (1) is connected, be used for the stock oil of described purification being carried out secondary filter, the stock oil that is further purified.
8. as claim 6 or 7 described devices, it is characterized in that the pressure between the stock oil import that contains coke powder of this device and the material oil outlet of purification falls and is no more than 0.15MPa.
9. as claim 6 or 7 described devices, it is characterized in that, the flow of the underflow opening of described cyclone separator (1) is the 2-15% of its inlet flow rate, and the sump oil rate of discharge of the spissated enrichment coke powder of described slurry tank or strainer (2) is the 0.1-3% of its inlet flow rate.
10. as claim 6 or 7 described devices, it is characterized in that described cyclone separator (1) is made up of cyclone pipe (11); This cyclone pipe (11) is composed in parallel by one or more micro vortex flow tubes, the material oil outlet chamber of a shared feed cavity, a coke powder outlet plenum and a purification, and wherein, described feed cavity is independent container or the unitary part in the container.
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| CN104046383B (en) * | 2013-03-17 | 2016-01-13 | 中国石油化工股份有限公司 | A kind of processing method of delayed coking and device |
| CN104046383A (en) * | 2013-03-17 | 2014-09-17 | 中国石油化工股份有限公司 | Delayed coking process and device |
| CN103224807A (en) * | 2013-05-10 | 2013-07-31 | 中国石油大学(华东) | Process for carrying out complextion and denitrification on coker gas oil |
| CN103706462A (en) * | 2013-12-16 | 2014-04-09 | 宁波广博纳米新材料股份有限公司 | Classification processing method for micron size copper powder |
| CN103706462B (en) * | 2013-12-16 | 2015-11-18 | 宁波广博纳米新材料股份有限公司 | The hierarchical processing method of Micron-Sized Copper Powders Coated |
| CN104888984A (en) * | 2014-03-05 | 2015-09-09 | 中国石化工程建设有限公司 | Magnetic cyclone separator, separation apparatus and separation method |
| CN105694951A (en) * | 2016-04-20 | 2016-06-22 | 浙江海洋学院 | Method for removing trace of coke powder in coker diesel |
| CN105778983A (en) * | 2016-04-20 | 2016-07-20 | 浙江海洋学院 | Method for removing trace coke powder in coker gas oil |
| CN111684044A (en) * | 2018-09-13 | 2020-09-18 | 日铁工程技术株式会社 | Dry quenching device and method for removing coke powder in boiler of dry quenching device |
| CN111117684A (en) * | 2019-12-12 | 2020-05-08 | 中国石油大学(华东) | Online oil gas decoking device and method for top of delayed coking tower |
| CN111117684B (en) * | 2019-12-12 | 2021-09-07 | 中国石油大学(华东) | Online oil gas decoking device and method for top of delayed coking tower |
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