DE1245900B - Process for calcining petroleum coke - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

ClOb

German class: 10 a -22/05

Number: 1245 900

File number: C 29513 VT b / 10 a

Filing date: March 29, 1963

Opened on August 3, 1967

The invention relates to a method for calcining oils by means of chamber coking produced petroleum coke.

In the process known as "delayed coking" for the chamber coking of oil residues, a petroleum coke is obtained which, with the appropriate choice of starting oils, is ideally suited as a material for the manufacture of electrodes. The raw coke is first broken after it has been discharged from the coking chamber and then has to be calcined, usually at temperatures between 1000 and 1500 ^° C. These treatments of the coke produce a not inconsiderable amount of fine grit and dust, which has so far been removed or recycled represents a problem that has not yet been satisfactorily resolved.

The coke is usually calcined in
a rotary kiln of conventional design, in which the '-

Good to be calcined in countercurrent hot encryption *

is exposed to combustion gases or a flame. 20 the use of grus as fuel for heat ais Energy source is preferably natural gas or a production in the rotary kiln is a significant other Fuel gas or oil is used. Much improvement in the effectiveness of a given stove the necessary calcination temperature is achieved by keeping the high-temperature zone inside fuel gas not reached by itself, so that the furnace is lengthened by half. That is based on the Excess air also blows part of the fact that solid fuel takes longer to coke must be burned with. To improve it burns as gas or oil and thus the burners The yield from such calcination processes and the maximum temperature in the rotary kiln increases Solving the problem of eliminating the incinerator over a longer section. at Lenden coke burrs in an economical manner became the same transport speed of the ready to be calcined suggested that the coke breeze and dust in 30 the good is the dwell time in the high temperature

Method of calcining petroleum coke

Applicant:

Continental Oil Company,

Ponca City, Okia. (V. St. A.)

Representative:

Dr. W. Germershausen, patent attorney,

Frankfurt / M., Neue Mainzer Str. 54

Named as inventor:

John Henry Smith,

Ponca City, Okia. (V. St. A.)

Claimed priority:

V. St. v. America dated April 25, 1962 (190 082)

Separate and recover settling chambers from the exhaust gases and then together with the Put the raw coke back into the rotary kiln. The method of calcining according to the invention of petroleum coke produced by chamber coking of oils in a rotary kiln under direct Heating by means of hot gases is characterized in that to generate heat from the exhaust gases The coke breeze deposited in the rotary kiln is longer in the temperature zone. This results in either a more complete and stronger calcination with a given throughput or, on the other hand, the possibility of to increase the throughput through a given rotary kiln with the same degree of calcination. as Another advantage of the process according to the invention is the increase in the coke yield. As already indicated, the combustion of gas alone in various systems is not sufficient

a gas stream blown into the rotary kiln 40 heat distribution and sufficiently high temperature and through a separate supply of fuel gases in a corresponding section of the furnace,

so that some of the coke itself had to be burned to produce sufficient heat. The inventive Process solves this problem, since it creates a sufficiently high calcination temperature is guaranteed in all cases.

The drawings serve to explain the method according to the invention.

F i g. 1 is a scheme of one used to carry out the exploited. As a result, on the one hand, the system preferably used;
required foreign fuels, such as heating gas or oil, Fi g. 2 is a more detailed illustration of the part reduced in its amount, on the other hand is indicated by les 12 of FIG. 1 in the front elevation. This part is

709 619/35

is burning.

In preferred embodiments of the method, the carrier gas for the coke breeze is air or uses a flammable gas.

The method according to the invention has considerable advantages over other corresponding methods. All of the coke breeze and dust, including that produced when the raw coke is broken, can be used completely

Claims (14)

3 4 in the discussion of Fig. 1 as a fluidized bed or voltage speed not in every case with the - Vessel 12 and is used for the task of the dust must match. To achieve the Coke burrs or dust into the carrier gas. required flexibility in terms of a complete For the described devices no combustion of the accumulating dust is desired, the plant protection is sought, since the task of the grus and damming to suspend the dust within a quake in the carrier gas also ranges between 50 and 160 ⁰ Zo of the usual and in any other way can be done in another device. The accumulating dust must be operational, and the pre-device is only described here, since the storage tank 17 must have a corresponding capacity beals particularly advantageous in the context of the implementation, which is used to absorb the accumulation of dust from increasing of the method according to the invention has proven. io rer days is sufficient. F i g. 1 shows the rotary kiln 1, which at 2 with the same as from FIG. 2, the coke dust arrives Raw coke is charged. The coke travels down through column 11, just above one the rotating furnace in countercurrent to the hot perforated plate 19 into the fluidized bed 12. Through Gas flow and leaves the furnace at 3. The dust line 13 is at the foot of the fluidized bed below loaded hot exhaust gases leave the rotary tube 15 of the perforated plate 19 a constant, however Oven 1 through the feeder housing 4, from where it is supplied with controllable air flow that passes through the holes pass through line 5 into a cyclone 6. (In the in the perforated plate in the upper part of the In practice, several of these separators can pass through the flow vessel 12 in parallel. Due to the airflow, it becomes be switched.) The discharged dust is put in the dust in a state of flow, in gas Dust cooler 7 is cooled and is suspended via the for- 20 and through line 16 to the furnace side derschnecke 8 is conveyed into the elevator 9 of the rotary kiln 1. The dust moves from the head of the elevator 9 for a plant for the production of 3001 calci- Via a chute 10 into a standpipe column 11, nated coke per day are the following operating data as the height of which is typical for the discharge into the fluidized bed 12: required static pressure of the dust column in the 25 dust accumulation 14 t / day
Guaranteed inside the column. The dust gets there through the standpipe column 11 down through the dust combustion: Ventu 15 into the hot bed or vessel 12, where it is possible to range from 10 to 22 t / day by means of the line from the compressor 20 13 Preferred range 12 to 17 t / day and via the quantity control device 21 draw 30 air supply in the fluidized bed 2.83 Nm ³ Zmin led air is brought into the flow state. Air fuel gas supply at the kiln 425 to 566 Nm ³ Zh is also at points A ₁ , A ₂ , A _s and A ^ in the column 11 is introduced to facilitate a uniform dust supply to the fluidized bed 12 is regulated by a dust discharge by creating "a sufficient automatically operated valve 22 at the base of the air cushion between the particles, 35 column 11. This valve is regulated by a by the formation by compressing and plugging pressure control operated, which is prevented by a pressure gauge.These additional air quantities are and regulator 23, which controls the preferably in a downward direction internal pressure in the fluidized bed via line 24 and the valve angle of about 45 ° introduced into the column, as controlled in 22 via the impulse line 25. Increases in the flow shown in Fig. 1. The number of air inlet beds 12 is indeed the pressure, the flow points through line 13 with a constant air supply and the flow rate used a measure of the amount of dust in suffering is a procedural detail, but tion 16 is about e At a certain pressure, preferably the introduction at intervals of about out and thus indicates a high amount of dust, so carried out 3.66 m, with just enough air on causes the pressure control to temporarily close each of the introduction points that the 45 of the valve is supplied 22 and thus a reduction in the increase in static pressure or the amount of dust that results. A low pressure in the fluidized bed has caused compression, starting from the next - the opposite effect,
higher point, is compensated so that the fixed- From F i g. 1 it can also be seen that the gas, which is kept almost constant in the substance-density throughout the pipe, is suspended via the line 16 into a. 50 second air supply line 26 immediately outside of the The chute 10 leads over the column 11 to the furnace housing 27. The line 16 ends to the reservoir 17, and from there allows the inside of this second air supply and extends to Line 18 a dust return to the elevator 9. directly to the inner surface of the furnace housing If necessary, ses is approached by closing the valve. So the dust gets into the furnace side 14 at the top of the column 11, all of the dust in the 55 of the rotary kiln above the fuel gas inlet 28 Reservoir 17 passed. Is the system blown in. In the oven, the dust particles take them Suspension of the coke dust in the gas in operation, separated from the hot coke and the furnace lining. so the bulk of the dust flows through the stationary radiated heat and is passed through tubular column 11 in the fluidized bed 12; next to it, the fuel gas flame is ignited and burned; on If a small excess of dust is constantly flowing through the 60 this way, the dust supplies most of the for Storage vessel 17 to ensure that the standing heat required for calcination,
pipe 11 to overcome the pressure difference between see fluid bed 12 and chute 10 always with one patent claim: dense column of dust is filled. The dust content from the 1st process for calcining The exhaust gas of the rotary kiln amounts to 65 mercoking of oils produced in petroleum coke according to about 4 to 5 ⁰ Zo of the total calcined in a rotary kiln with direct heating with- Coke. In the course of time, the entire dust can be displaced by hot gases, which are be burned in the furnace, even if the burned, that to generate the heat from the waste