Method for oil coke tempering

FIELD: oil and gas industry.

SUBSTANCE: method includes preparation, pre-heating and tempering of source oil stock, at the same time moist oil stock is exposed to grinding to fraction of 0-25 mm, dried by internal smoke gases with rated speed of 60-90 m/sec and temperature of 350-400°C in the suspended layer with fountain-like circulation of coke particles to 0.5-2% of moisture content, exposed to cyclone separation with provision of trap ratio of more than 97% and with sifting of dust-like particles with fraction from 0 to less than 2 mm, which is treated with greasing agent with consumption of 0.5-1.0 wt %, per 1 one of coke, and stabilised hot coke with T-60-90°C of fraction more than 2-25 mm is tempered in a rotary drum furnace.

EFFECT: invention makes it possible to increase productivity of tempering furnaces, to stabilise process mode of coke tempering, to improve quality of oil coke, to reduce specific power inputs, to produce commercial product, to reduce anthropogenic emissions into environment.

1 dwg

 

The invention relates to the refining industry and can be used in technology calcining petroleum coke.

It is known that annealing is an important stage in the production of oil and pitch coke for a qualified use in steel, coke and other industries. Especially this stage is important for chars delayed coking unit, which contains a lot of moisture and volatile substances. The annealing improves the quality of coke and significantly increases its brand value: calcined coke in 2-3 times more expensive crude.

The main factors determining yield and quality of the calcined coke are:

- quality raw petroleum coke;

technological factors: temperature, time, heating rate up to the required temperature, the staging, the conditions of heat transfer to coke and combustion of volatiles, temperature and condition of supply for combustion of volatile substances, environment, appearance, and fuel consumption, the design of Prokhladny furnaces and other

Raw petroleum coke is characterized by significant fluctuations in the quality:

- particle size from 0 to 50-70 mm;

the fines content (particle size less than 8 mm) 30-60%;

- dust particles (size less than 1 mm) is 10-40%.

With decreasing size of particles in the oil is m coke increases the moisture content, volatile matter, ash elements, increases the sintering behavior, reduced strength. These indicators of the quality of raw materials affect the efficiency of annealing. When the humidity is reduced performance, increased fuel consumption, increased waste and loss. Increase the yield of volatile substances reduces the output of calcined coke.

High content of dust particles reduces the productivity of plants growing due to deterioration of heat transfer, the output of the calcined coke is reduced due to the high ash and smoke dust particles.

For example, the loss of the smoke and ash of petroleum coke in the drum ovens baking Omsk and Pavlodar and Volgograd refinery with a capacity of 140 thousand tons/year is from 2.2 to 3.5 and to 7.1-9.5 thousand tons/year, respectively.

In the process most Prokhladny furnaces (PP) petroleum coke used direct method of drying oil raw material, i.e. heating of the raw coke humidity of 10-15% wt. occurs in the initial section of the PP at temperatures up to 600°C.

The disadvantage of this method is the drastic education providentia, oxidative reactions, have about 40% of the powdered stuff worsen the conditions of heat transfer during combustion of coke, the more fine particles, the greater the content of moisture and volatile substances, is ash and fumes dust the particles, with baking above 40% index Horns arise coke deposits (primechanie) on the walls of the chamber and pigs hearth furnaces, and also because of the formation of tar volatile matter (at very high content of volatile raw material >15% wt.), otlichayuschihsya as "coke rings" on the walls of the drum furnaces, resulting in longer equipment repair.

The above factors reduce the performance calcining furnaces, as petroleum coke, increase the cost of repair of equipment and provision of environmental regulations on industrial emissions.

There is a method of drying wet raw petroleum coke on the principle of blowing hot coolant wet material transported by the screw. At industrial test drying were subjected to detail petroleum coke Fergana and Krasnovodsk refinery supplied to the calcining chamber in furnaces to provide the necessary indicators: performance, final moisture content of coke and requirements of safe operating conditions (see VG vyshnyov, A.P. Vinogradov and other "Experimental-industrial drying ' green ' petroleum coke", W-l "Chemistry and technology of fuels and oils), No. 9, 1983).

However, the implementation of this method in the presence of the above positive factors, both technological and economic settled them in terms of ensuring the required humidity, reduce waste, increase productivity furnace calcination by eliminating heating of the ballast (moisture) had significant disadvantages, for example, efficiency of about 80%, the cost of additional equipment for dust cleaning and other

There is a method in the coke, developed by FSUE "WOHIN", drying the coal charge similar to the raw oil coke, before glowing with finely chopped carbon fraction 0-8 mm, drying in suspension with the use of fluidized bed apparatus or a high-speed drying in the tube driers section of the Venturi.

For drying the mixture used is recyclable heat of flue gases coke oven batteries. The process allows to reduce the heat consumption of coking on 90-105 MJ/t mixture at 1% moisture, to reduce the coking period at 3.75%, to increase the density of the charge in the chamber coking 6.9% and the quality of metallurgical coke, the performance of the coke batteries at 10-11%.

The method also combines the drying process of the charge with the technology of its preparation, by way of selective crushing with mechanical separation (see YA Eremin, V.G. of Medicin and other "prospects for the use of flue gases coke oven batteries for drying the coal charge before coking". W-l "coke and chemistry), No. 3, 2011, p.23-33).

However, despite the above advantages, the method cannot fully ensure the efficiency of the process, because of technology there is a definite relationship between thermal resource (expense) of the flue gases, their temperatures and moisture content, at the same time, significantly increase the costs of implementing method.

The known method (analog) continuous calcination of petroleum coke in a rotary tube furnaces (see author's certificate. SU 239206 A1, 18.03.1969. A. Zverev, VP Lyakhov and others).

The proposed method of calcining furnaces, operating on the principle of co-current, preheating the coke conduct flue gases produced by burning fuel (gas or oil), and heating the coke to a temperature of calcination due to the combustion of volatiles emitted from coke.

According to the authors this way the process of calcination of petroleum coke fuel consumption is reduced to glowing through the use of heat of combustion of volatile sharply reduced through burning of the coke during the calcination due to the fact that in the initial period of heating coke is protected from oxidation of volatile, and further in contact only with the flue gases, the content of free oxygen in which is insignificant.

The authors also believe that the implementation process will significantly increase the resources consumption of low-ash coke small fraction (less than 25 mm) for aluminum, electrode and other industries.

But Yes the hydrated method of calcining petroleum coke also has some significant drawbacks:

- the presence in the raw materials with different fractional composition of chars 0-25 mm does not allow using pre-drying flue gases in a rotary tubular furnace to achieve a uniform residual moisture content of chars;

- due to the high content of pulverized dust 0-<2 mm, about 30-40% by weight. during combustion of coke is only possible to reduce losses by smoke and ash, anthropogenic emissions into the environment.

The above factors reduce the effectiveness of the process of roasting, calcining furnace productivity, quality calcined coke, also increase the cost of its implementation through the use of special Paleocene devices due to significant entrainment of dust-like stuff.

The aim of the invention is to increase productivity Prokhladny furnaces, improving the quality of petroleum coke, the reduction of investment costs per unit, obtaining a marketable product for the coal charge coke and steel production, reduction of anthropogenic emissions into the environment.

To solve this problem is proposed a method of calcining petroleum coke, including wet grinding of raw materials to a fraction of 0-25 mm, drying its own flue gases with an estimated speed of 60 to 90 m/sec and a temperature of 350-400°C in suspension layer with fontanaarte circulation cha is TIC coke to a moisture content of 0.5-2% wt., cyclone separation with an estimated recovery ratio >97% dropout powdered stuff fraction 0-<2 mm with the processing of its obmakivaem agent with a flow rate of 0.5-1% wt. 1 ton of coke to use as a commercial product and the sampling fraction >2-25 mm stable of hot coke to a temperature of 60-90°C for annealing in PP.

The proposed method can be implemented by a device, schematically represented in the drawing.

The device includes: preparatory Department of crushing, screening and transport of the raw coke 2, update rollup 3 silos, site dewatering and separation 4, a mixer 5, the node packing 6, calcining furnace 7, the refrigerator 8, a storage silo calcined coke 9, oven afterburners 10, the boiler 11, the flue 12.

The method is as follows. Raw materials 1 raw petroleum coke plants delayed coking fraction 0-50 mm arrives in the preparatory Department 2 on crushing, Gro-kochanie and transportation of crude coke, where the separation of coke on faction 0-25 mm and >25-50 mm with further grinding faction >25-50 mm to faction 0-25 mm, then the pipeline is routed in cumulative silos 3, arrive at the site of dehydration and separation of raw material 4 for drying your own flue gases T=350-400°C boiler 11 and cyclone Sep'a is the situation with dropout dried coke breeze, which then comes with obmakivaem agent in the mixer 5 to obrazovaniya node packing 6 future use as a commercial product, and the fraction >2-25 mm is directed into the furnace calcining petroleum coke 7, after the annealing is cooled in the refrigerator 8, is then loaded into the cumulative silo calcined coke 9, and exhaust coolant enters at the disposal of the oven afterburners 10, then in the boiler 11 and thence through the pipe 12.

The proposed solution allows you to:

to stabilize the quality of the proposals submitted in the oven baking coke, to reduce the factors of segregation of particle sizes when bunkering" due to the averaging of particle size distribution (crushing, screening, drying, sifting trivia), ensuring uniformity of properties on the moisture content, volatile, and thermal and dynamic characteristics of a moving furnace coke;

- to make uniform drying of the raw coke own flue gases to 0.5-2% moisture content in the suspended layer with fontanaarte circulation of the particles of the raw coke in the flow of the drying agent (flue gases) through the optimal residence time of particles of different size, automatic trapping larger particles, making them warm-up in the circulating wall whirlwind inside of the apparatus, and fast the removal of small particles with a Central axial flow, what prevents them from overheating;

to improve the process mode of operation of the furnace calcination due to the quality of the stabilized dried with hot T=60-90°C coke, sifting powdered stuff, reduction of ash and smoke up to 1-1,5% wt. and build-up of dust particles on the lining;

- reduce fuel consumption by Prokhladny process;

to reduce the cost of current repairs;

to reduce anthropogenic emissions into the environment due to the Gigue dusty flue gases after drying and cyclone separation;

to make sifting powdered stuff after drying and cyclone separation with her obmylivaniem and sale as a commercial product (supplements to the coal charge in the coke and steel production).

Method of calcining petroleum coke plants delayed coking unit, including preparation, preheating and calcining the source of crude oil, characterized in that the wet oil feedstock is subjected to grinding to a fraction of 0-25 mm, dried your own flue gases with an estimated speed of 60 to 90 m/s and a temperature of 350-400°C in suspension layer with fontanaarte circulating coke particles up to 0.5-2% moisture content, is subjected to cyclonic separation to ensure recovery ratio >97% and dropout powdered stuff fraction 0-<2 mm, which is treated obmakivaem agent with a flow rate of 0.5,0 wt.% 1 ton of coke, and stable hot coke with T=60-90°C fraction >2-25 mm is subjected to calcination in a rotary drum furnace.



 

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