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.
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.
SUBSTANCE: invention relates to an increase in quality of carbon-containing materials by means of thermal processing using method of direct contact of material with heat-bearing medium and removing moisture from material. Carbon-containing materials, which have the first level of balanced content, are subjected to direct contact with heat-bearing medium under pressure to heat the material and remove moisture therefrom to the second level of moisture content being lower than the first one and to reduce the level of balanced moisture content to the value which lies between the first and the second level of the balanced moisture content, with further separation of released moisture from material. Plant for processing carbon-containing materials incorporates technological apparatus with material loading chamber, input and output devices for loading and discharging material from the chamber, input device for supply of heat-bearing medium into technological apparatus for direct contact with material, ventilation window for gas removal, draining device for water discharge and separator, which serves as a means of separation of liquid and hard particles of the material.
EFFECT: chances to remove undesirable admixtures from material and minimisation of residual moisture when processing carbon-containing materials.
57 cl, 9 dwg, 6 ex
FIELD: briquetting brown coal in regions remote from consumer.
SUBSTANCE: proposed method includes grinding the coal, heat treatment, mixing with binder and molding. Coal is mixed with binder at pyrolysis of coal fines and "chocolate"-shaped plates are molded in between polymer films.
EFFECT: reduced wear of briquettes in transit; reduced consumption of binder.
FIELD: metallurgy, oil refining industry and coke-chemical industry; calcining of carbon-bearing materials.
SUBSTANCE: the invention is pertinent to production of calcined carbon-bearing materials, in particular, to production of graphitized electrodes and anodic mass and may be used in metallurgical, oil refining, coke-chemical industries. A method of calcinations of the carbon-bearing materials provides for a preliminary heating of materials. Simultaneously with the process of calcination they conduct preheating of the material in a heater in the mode of a counter-flow of heat produced during reburning of a waste gas generated during calcination of the carbon-bearing material. The preliminary heating of the material preferably should be realized at the temperatures not exceeding 350-400°С. The invention allows to increase the furnace performance by 20% and to reduce a specific consumption of fuel by 50%.
EFFECT: the invention ensures significant increase of the furnace productivity and high reduction a specific consumption of the fuel.
2 cl, 1 ex, 1 dwg
SUBSTANCE: invention relates to pulverised coal fuel for blast-furnace smelting from carbon-containing finely ground starting material which is a product with output of volatile substances of up to 25% in amount of (3-100) wt %, obtained via slow semicoking of black oil; the fuel contains a desulphurising agent, wherein the carbon-containing finely ground starting material and desulphurising agent are in the following ratio: carbon-containing finely ground material - (90-99) wt %; desulphurising agent - (10-1) wt %.
EFFECT: using pulverised fuel in the energy field and ferrous metallurgy, specifically in the process of blast-furnace production of cast iron, increases efficiency of the blast-furnace process and improves environmental friendliness of the blast-furnace process, widens the raw material base used the pulverised fuel associated with the blast-furnace process.
3 cl, 1 dwg, 2 ex, 3 tbl
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to oil processing, particularly, to coke production of decelerated carbonisation with possibility of trapping coke steaming and cooling products. Proposed method comprises stock coking with accumulation of coke in chamber 6, separation of coking distillate products in rectifier column 7 into gaseous products 10, light and heavy solar oils 23 and 24, and heavy residue 9, coke steaming 30 and water-cooling 31, feeding steaming and cooling products 14 into absorber 13 furnished with heat exchangers, separating said products in absorber 13 into vapor and liquid phases, absorption of high-boiling oil products from vapor phase by feeding reside 16 from the bottom of absorber 13 to mass exchanger, cooling and condensing vapor phase components in condenser-refrigerator 17 and separating cooling products in separator 18 into gas, oil products and water. Note here that heavy solar oil 24 is divided into several flows. One of the latter is used as recycle 4 to be mixed with stock in evaporator 2 prior to coking. Another flow is used for diluting steaming and cooling products 14 prior to feed into absorber 13. Third flow is used as absorbent to top mass exchanger of absorber 13. Residue 16 from bottom of absorber 13 is fed back as absorbent to mass exchanger arranged at absorber center, preferably, to third or fourth mass exchanger. Balanced amount of reside 16 from absorber 13 and separated oil products from separator 18 are fed back into bottom of rectifier 7. Flushing product 27, for example, heavy solar oil, may be fed into condenser-refrigerator.
EFFECT: higher yield and efficiency.
2 cl, 1 dwg, 2 ex
FIELD: oil and gas industry.
SUBSTANCE: coke obtaining method involves heating of coking raw material in the furnace up to 480-500°C, introduction of inorganic additive to the coking raw material after it is heated in the furnace and further coking of the obtained mixture in the reactor; at that, inorganic additive is added to the coking raw material in the form of a paste-like mixture with hydrocarbon diluter. As inorganic additive there used is CaO or Ca(OH)2 or CaCO3. Hydrocarbon diluter represents initial coking raw material or heavy oil residues and other oil products.
EFFECT: method allows enlarging the furnace life and increasing the efficiency of slow coking plant.
4 cl, 1 tbl
FIELD: oil and gas industry.
SUBSTANCE: low-sulphur oil coke obtaining method involves the following: preparation of coking raw material by mixing the initial raw material first with heavy gas oil of catalytic cracking in quantity of not less than 30% per initial raw material with further primary heating of the obtained raw material up to 280-320°C and enrichment with heavy coking gas oil fractions by introducing the recirculated substance of heavy coking gas oil from distillate products in quantity of not less than 30% per the obtained raw material mixture to the bottom of rectifying column and supply of the obtained mixture to the reactor after secondary heating up to coking temperature, which differs by the fact that as initial raw material there used is tar oil mixed with bitumen; at that, the bitumen content is not more than 30%.
EFFECT: method allows increasing the yield of low-sulphur oil coke due to new composition of initial raw material.
1 cl, 1 tbl
FIELD: oil and gas industry.
SUBSTANCE: initial raw material is heated in furnace 1 to temperature of 250-390°C and supplied to evaporator 2, where the recirculated substance, and namely heavy coker gas oil, is supplied as well. The secondary raw material is obtained as a result of mixing of initial raw material with the recirculated substance. Secondary raw material is heated in reaction furnace 4 up to temperature of 450-480°C. In rectifying column 3 the vapour-liquid products are fractionated into gas, petroleum, light and heavy gas oils and still residue. The latter is mixed with calcium and/or magnesium oxide in mixing tank 6 and supplied to coking chamber 5 simultaneously with the supply of heated secondary raw material. In coking chamber 5 there formed is coking additive and vapour-liquid coking products.
EFFECT: invention allows obtaining coking additive with low sulphur content and high volatile matter content.
3 cl, 1 dwg, 1 tbl, 6 ex
FIELD: oil and gas production.
SUBSTANCE: reactor warm-up products are fed into warm-up tank 2 and, then together with coke steaming and cooling products from reactors, into column absorber 3. Liquid oil product is directed from rectifier 2 into main rectifier while steam-gas flow is discharged via condenser freezer 8 into separator 9 for separation into gas, water and hydrocarbon condensates. With steaming and cooling product temperature falling below 160°C, said products are directed for separation into gas, water and hydrocarbon condensates into settler 1. Reactor warm-up products and those of coke steaming and cooling flow from reactors into absorber 3 with temperature of 240-160°C, while reactor warm-up products flow into warm-up tank 2 with temperature exceeding 110°C. Thin-layer separator is used as said settler. Hydrocarbon condensate is partially returned from settler 1 into absorber 3 for live reflux and, partially, into main rectifier or boiler oil tank.
EFFECT: higher quality of separation.
6 cl, 1 dwg
FIELD: oil-and-gas production.
SUBSTANCE: proposed method comprises heating initial carbonisation stock in tubular furnace 1, feeding it into evaporator 2 for mixing with recycle and producing secondary stock of carbonisation in tubular furnace 4, and feeding it into carbonisation chambers 5. It includes feeding produced carbonisation products from carbonisation chambers 5 into rectification column 3 for fractionation to produce gas, gasoline, light and heavy gas oil of carbonisation, and distillation residue. It includes also feeding cooled heavy gas oil to mass exchange devices at said rectification column bottom. Note here that cooled light gas oil is fed to heat exchangers of rectification column top. Amount of aforesaid gas oils is varied subject to required quantity and quality of said gas oils and distillation residues. Heavy gas oil of carbonisation is used as recycle.
EFFECT: expanded process performances, control over quantity and quality of gas oil fractions, longer life.
3 cl, 1 dwg, 2 tbl, 4 ex
FIELD: oil and gas industry.
SUBSTANCE: processing method of bituminous sands involves their heating in viscosity breaking mixing reactor together with its efficient mixing till homogeneous consistency is obtained. Heating is performed at 400°-500°C. After volatile fractions of oil products are liberated from the obtained product, the product with reduced viscosity is obtained. The obtained product is supplied to quick coking reactor where the obtained product flow is moved with gas jet and dispersed. At that, gas is supplied at speed of 30-40 m/sec. Coking process is performed continuously in hydrodynamic mode so that stable spouting bed is created at atmospheric pressure and temperature of 600-650°C during 1-2 seconds. After that, the formed coke is removed, and coke gases are supplied after solid particles are separated from them for separation into condensing and non-condensing component parts.
EFFECT: advanced primary treatment of raw material, reduction of coke formation time, possible heat treatment of fine particles, which allows obtaining homogeneous coke with dense structure.
FIELD: oil and gas industry.
SUBSTANCE: invention relates to the field of oil processing. The method includes heating of source raw materials with subsequent formation of secondary raw materials, heating of secondary raw materials in a reaction furnace 2 and their supply to a coking chamber 3, where the coke and steam-liquid coking products are produced, fractionating of the latter in a rectification column 4 with production of gas, benzine, light and heavy gas oils and stillage bottoms of coking, thermal cracking of the heavy gas oil, at the same time the secondary raw materials are formed in an evaporator 1, connected by vapours with the rectification column 4, by mixing of the source raw materials with a part of the heavy gas oil supplied from the rectification column into the evaportator in the form of a recirculate, and formed products of thermal cracking of the remaining part of the heavy gas oil are mixed with stillage bottoms of coking, and the produced mixture is introduced into secondary raw materials prior to supply into the coking chamber 3.
EFFECT: increased overhaul life of a plant.
1 dwg, 2 ex, 2 tbl