O.I. Doshlov(instructor), A.E.Shiryaeva(bachelor), I.O. Doshlov(magistrate)

Irkustky State Technical University

MODERN TECHNOLOGY PRODUCTION OF PETROLEUM COKE

Nowadays delayed coking is considered the most technically feasible and cost-effective process of refining, as at the same time solves the problem of increasing the production of motor fuels and petroleum coke electrode. The growing demand for petroleum coke electrode can be solved by improving the existing facilities by reducing the coking cycle. (1)

   Technology hydroremoval petroleum coke along with the technological parameters of coking process directly affect the cycle time of the reactor. The intensification of the work of delayed coking units through the reduction of cycle Coke 12 hours performance hydroremoval coke from reactors should be Increased in 1 , 5 - 2 times, compared to the existing cycle coke 24 hours .

Information about the technology hydroremoval coke from reactors with reduced coking cycle 12 hours for overseas USO is very limited, there are practically no data on the qualitaty characteristics derived from petroleum coke, grain composition discharged coke and waterjet parameters. (2)

Decrease on the one side coking time, and on the other, an increase in productivity hydroremoval coke make difficult the task of implementing measures to ensure the conservation of particle size distribution of coke discharged, is determined primarily by the physical and mechanical properties of the latest in the reactor. (3)

Сharacteristics of the main components for the production of composite pitches

Table №1

binder	Density g/cm^3	Tpa, oC	Carbon residue, %	viscosity cP at 185^0С	insoluble in toluene, %	insoluble in quinolone, %	distillation to 360^0С
coal tar pitch	1,33	107	56	200-500	25-35	7-13	< 4
petroleum pitch	1,20	107	46	100-300	12-15	0	4-6
bitumen for construction (modified)	1,04	107	22	1000	20	0	8

   Therefore, an important task in reducing coking cycle with reception electrode coke are questions thermodestructive feedstock preparation and management of the technological parameters of the process of coking.

   With the decline in coking cycle significantly increases the volume of water consumed per hydroremoval coke. Therefore it is not less important task in reducing coking cycle is the development of the local wastewater system formed by a delayed coking unit and return them to the return water system hydraulic decoking. (4)

   As a result of studies on laboratory and industrial installations coking shown ways of obtaining high-quality electrode coke satisfying the technical requirements TU .0258-128-00148636-2003 "Coke electrode to the aluminum industry. Specifications ", while reducing the coking cycle to 12 hours.

  The possibility of maintaining the current turnaround furnaces, physical and mechanical properties of coke and the yield of volatile substances in it, by refining raw coking residual oil extracts, a rise in temperature at the outlet of the furnace at 10⁰ ° C and the improvement of the thermal regime of the reactor by reducing the temperature difference between its bottom and top at 6⁰C. (5)

   It was established experimentally that the maximum possible increase in the total lump coke fractions achieved with stepwise method screw it hydroremoval with trimming, at an inclination to the horizontal nozzles hydrocutter 10⁰C.

The main characteristics of hybrid binders

Table №2

binder	Density g/cm^3	Tpa, oC	Carbon residue, %	viscosity cP at 185^0С	insoluble in toluene, %	insoluble in quinolone, %	distillation to 360^0С
original TSP(modified)	1,04	-	9	40	-	-	-
hybrid binder	1,20	98	48	250	15	0	9
АС 50:50	1,26	111	55	340	31	7,0	4
K/y pitch	1,30	115	56	500	34	10	2,6

The adoption of improved methods and tools hydroremoval coke on USI 21-10 / ZM in Angarsk will increase productivity hydroremoval coke in 1, 4 times, reduce the unit cost of water and electricity by 1.5 times and increase output electrode fractions (more than 8 mm) more than 3% and will improve performance on the delayed coker feedstock as a whole while reducing the coking cycle to 12 hours.

References:

1 Sunyaev ZI Production, refinement and use of petroleum coke / Z.I. Syunyaev. M: Chemistry-1973-295s.

2 Robinson, B. Reconstruction of delayed coking units will increase capacity and improve operational performance. 4th Conference and Exhibition of equipment for oil refining and petrochemistry in Russia and CIS countries. Moscow, April 20-21, 2009.

3 N.P. Zaitseva and others. Chemistry and technology of fuels and oils. , Chemistry, 1980, № 4, p.38-39.

4 Kapustin S.M. and others. Chemistry and technology of fuels and oils. , Chemistry, № 4, p. 38-39

5 Doshlov O.I ."Adhesion and Adhesives", Volume 3, Irkutsk, Irkutsk State Technical University, 1999.