The method of obtaining petroleum coke

 

(57) Abstract:

The method of obtaining petroleum coke relates to the field of oil refining. The method includes feeding recirculate in raw materials, heating the resulting mixture in a tubular furnace, coking her in the reactor delayed coking unit. To improve the quality of coke, increase the output of lumpy coke, reduce energy consumption, increase turnaround installation in recirculate and/or in the mixture of raw materials with recirculator pre-enter the air in quantities of 2 to 9 wt.% for raw materials.table 1.

The invention relates to the field of oil refining, in particular to methods of producing coke delayed coking.

A method of obtaining petroleum coke comprising heating the feedstock in a tubular furnace, coking him in a reactor of a delayed coking unit (DCU) [1]

The disadvantage of this method is that when tightening the technological regime to improve the quality of coke overhaul mileage installation is reduced.

Closest to the claimed object is a method of obtaining petroleum coke, including the filing of recirculate in raw materials, heating the resulting mixture in a tubular furnace, coking e is La obtain improved coke quality in proportion to increase of the specific energy costs for heating, pumping and cooling of recirculate. This increases the velocity of the vapors in the reactor increases, the cocking behavior distillate, increases the risk of removal of the foam from the reactor and coking of the furnace coil.

The invention is aimed at improving the quality of coke, the increase in the output of lumpy coke, decrease energy consumption, increase the length of non-stop runs of the furnace and the installation in General.

This is achieved by the known method of obtaining petroleum coke, including the filing of recirculate in raw materials, heating the resulting mixture in a tubular furnace, coking her in the reactor, ultrasonic inspection, recirculate and/or in the mixture of raw materials with recirculator add the air in the 2oC9 wt.

Supplements of air in recirculate within the specified limits and restriction on its content in the mixture allow to go beyond the ignition of the mixture and to achieve speed regulation of the oxidation of hydrocarbons, the temperature decrease in the formation of radicals through reactions dehydrogenization, the collapse of the intermediate oxygen compounds and tear carbon chains.

The increased reactivity of the raw materials makes carrying a secondary reactions of polycondensation is esta coke and increase output of lumpy coke.

The proposed method is as follows.

Heated in heat exchangers feedstock is sent to a distillation column where it is mixed with the heavy fractions of the distillate. In the resulting secondary raw material after mixing with turbulization (water) add air, then heated in a tubular furnace 2, is mixed with recirculation (heavy gas oil) coming from the column 3, in which pre-add air, and fed into the reactor 1 at a coking. The number added to recirculate air is 2 to 9 wt. for raw materials. Stretching from the top of the reactor pairs are in column 3, where they are separated into gas, water condensate-turbulization, gasoline fractions, light and heavy gas oils. Part of the heavy gas oil is used as recirculate. Coke is discharged through the lower hatch reactor.

The pilot ultrasonic testing of the pilot plant were subjected to coking of heavy hydrocarbons (a mixture of tars) density at 20oC about 1 g/cm3and cocking behavior on Conradson 16% by a known method (prototype) example 1, the proposed method (examples 2 to 4), with transcendent values of the proposed method (examples 5, 6). The coking conditions, yield and quality of the resulting Koc is on way will reduce the recirculation ratio of 1.10 to 1.00 ( in the prototype of 1.55), that will reduce energy consumption for heating, pumping and cooling of recirculate, and reduce maksuameti distillate to 0.19 to 0.21% (in the prototype -1,8%), the risk of removal of the foam from the reactor and zakochany coil of the furnace and, consequently, will provide an increase in the turnaround of the furnace and the installation in General. In addition, when using the proposed method will increase the output of lumpy coke to 54 76 wt. (in the prototype, 51 wt. ), will improve the quality of coke: the mechanical strength is increased to 55 81 kg/cm2(in the prototype 53 kg/cm2and reduced content of volatile to 6.1 to 6.3% (in the prototype of 6.4%).

Reduction of air flow in recirculate less than 2% is impractical, because although the coefficient of recirculation is reduced to 1.04 and coking ability of the distillate is reduced to 0.1% as of coke on the mechanical strength and the content of volatile deteriorating. The increase of air flow in recirculate over 9% along with the advantages (increased output of lumpy coke, increased mechanical strength and reduced volatile) causes an increase in the duration of coke unloading, increased maksuameti distillate.

Optimization of air flow in recirculate carried out depending on the properties

The method of obtaining petroleum coke, including the filing of a rebreather in raw materials, heating the resulting mixture in a tubular furnace, coking of the mixture in the reactor delayed coking unit, characterized in that recirculate and/or in the mixture of raw materials with recirculator pre-enter the air in quantities of 2 to 9 wt. for raw materials.

 

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FIELD: oil production; trapping hydrocarbons in slow coking plants.

SUBSTANCE: proposed plant includes reservoir for receiving the products heating the coking reactors with piping system equipped with pumps discharging non-conditioned oil products and pipe lines discharging gas for rectification or sprinkling into scrubber for steaming and cooling the coke at discharge of gas into atmosphere and drainage of water condensate into disposal system through hydraulic seal; hydraulic seal is connected via vibrating sieve with near-reactor coke accumulator combined with gravity filter; above-sieve part of vibrating sieve is connected with near-reactor coke accumulator and under-sieve part is connected via gravity filter with deepened circulating water reservoir or with disposal system. Proposed plant makes it possible to return some components of water condensate and cool coke at simultaneous discharge of them to disposal system.

EFFECT: improved quality of separation of steaming products.

3 cl, 1 dwg

FIELD: petroleum refining industry; petroleum residue coking retarding method.

SUBSTANCE: the invention is pertaining to the field of petroleum refining industry and is aimed at improvement of operation of installation of petroleum residue coking retarding. The method includes a preliminary heating of the original crude, its mixture with a recirculator - a heavy gas-oil of a coking with production of a secondary raw material and heating it up to the temperature of coking in the reactor with formation of a coke and distillate products of coking and preparation of the reactor. In case of failure of one of the reactors the thermal formation of the secondary raw material is cooled and is directed for separation into the rectifying tower, while in the operating reactor they conduct preparation and the following cycle of a coking is exercised in the same reactor. The invention allows by recovery of the process of coking to raise its efficiency.

EFFECT: the invention allows upgrade the coking process efficiency.

2 cl, 1 dwg, 1 tbl

FIELD: petroleum processing.

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EFFECT: increased yield of liquid products, reduced sulfur level in products, and reduced material and power consumption.

2 cl, 2 tbl

FIELD: oil refining processes; warming-up retarded coking reactors.

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EFFECT: reduced power requirements due to avoidance of use of water vapor; reduced toxic effluents.

3 cl, 2 ex

FIELD: petroleum processing and petrochemistry.

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EFFECT: increased yield of coking gasoline and improved quality of coking gasoline.

2 dwg, 3 tbl

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EFFECT: the invention ensures the improved quality of separation of the trapped harmful ejections, reduction of the share of petroleum in the water condensate, the decrease of the petroleum products losses, the increased efficiency of the process of trapping, the improved ecological indexes of the process of the retard carbonization.

8 cl, 1 ex, 1 tbl, 1 dwg

FIELD: petroleum processing.

SUBSTANCE: invention aims at simultaneously producing petroleum coke with low and high contents of volatiles, which coke, after calcination, can be used to manufacture anodes or graphitized products. Process of producing petroleum coke through retarded coking of petroleum residues comprises supplying feedstock to coke chamber at 475-485°C, coking during 14 to 36 h, discharging resulting coke by drilling central well in the coke bulk and cutting coke of the top part of chamber until it is completely emptied at a depth 4-5 m, discharged coke is removed from under the chamber and after that cutting of coke is continued in the lower part of chamber until it is also completely emptied. Thereafter, coke discharged from the top part of chamber and coke discharged from the lower part of chamber are stored separately. The former contains at least 15% volatiles and is used as substitute of sintering and thinning components in coal coking charge in blast furnace coke production and the latter contains no more than 11% volatiles.

EFFECT: enabled simultaneous production of volatiles-rich and low-volatile cokes.

1 tbl

FIELD: .oil industry

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EFFECT: simplified method.

2 cl, 2 tbl, 7 ex

FIELD: petroleum processing.

SUBSTANCE: invention relates to apparatuses for isolation of hydrocarbon fractions of liquid fuel and coke from straight-run goudron and acid sludges, aged mazuts, oil slimes, and can be used to utilize indicated wastes. Reactor for isolation of hydrocarbon fractions of liquid fuel and coke from subquality coking products and petroleum processing wastes comprises upright cylindrical body 1 with plane bottom 2 provided with external heater 3 having central opening 21 with connecting pipe 22; feedstock receiver 5 secured to drive shaft 4; perforated sparkling tube 6 rigidly connected to feedstock receiver 5; and knife 7 mounted on shaft 4 before sparkling tube in the direction of rotation of shaft 4 and in parallel to bottom 2 and tube 5. Perforations of sparkling tube 6 are made in the form of through grooves 11 along cylindrical surface of tube 6 and are positioned over plane gutter 12. Sparkling tube 6 bears rod 13 for longitudinal displacement. Rod 13 supports scrappers 16. Body 1 accommodates direct (9) and back (10) pushers of rod 13. Feedstock receiver 5 and sparkling tube 6 are provided with screens 24 and 25. Cutting edge of knife 7 is made in the form of equal-sided corner prominences. Hub 19 with radial inclined blades 20 is attached to lower part of shaft 4 and connecting pipe 22 is provided with radial counterblades.

EFFECT: prolonged duration of continuous operation of reactor and increased productivity.

3 dwg

FIELD: petroleum processing.

SUBSTANCE: method according to invention determines pressure gradients at exit and entrance in each section of the furnace and real gradient is compared to projected gradient, after which, depending on disagreement value, this value is diminished via variation of fuel consumption in corresponding furnace burner. Projected gradient is calculated using formula: ΔPi=k(L1+b)n, wherein ΔPi is pressure gradient in i-th section of coil, %; k, b, n are coefficients depending on conversion value, nature of raw material, and projected quality of final thermal destruction products; and L1 reduced length of coil from its beginning to i-th measurement point, %.

EFFECT: decreased coking of furnace coil and increased operation cycle of plant, which incorporates the furnace.

3 cl, 3 tbl

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