Doshlov O.I., Matreninskiy K.E.
Irkutsk National Research Technical University
Environmental problems of the production of petroleum coke
Delayed coking is now
considered the most technically feasible and cost-effective process of
deepening of petroleum refining , as simultaneously solves the problem of
increasing the production of light oil and petroleum electrode coke. The
growing demand for petroleum electrode coke can be solved by improving the
existing production by reducing the coking cycle , selection of quality raw
materials and improve the technology. [ 1 ]
Hydroremoval petroleum coke along with the technological parameters of the
coking process directly affects the cycle time of the reactor. By intensifying
the work of setting the delayed coker by reducing the coking cycle to 18 hours
hydroremoval coke productivity of the reactors should be increased by 1.5-2
times compared with existing coking cycle 24 hours.
Available information technology hydroremoval coke from the reactor at the
reduced coking cycle of 18 hours at foreign ultrasonic testing is very limited
, there are practically no data on the quality characteristics of the resulting
petroleum coke , grain composition discharged coke and waterjet parameters . [
2 ]
Therefore, an urgent task in reducing coking cycle to produce electrode
coke are questions termodeskruktivnoy feedstock preparation , adjustment of
parameters of the coking process and environmental problems.
With the decline in coking cycle significantly increases the volume of
water consumed per hydroremoval coke. Therefore it is not less important in
reducing coking cycle is the development of the local wastewater treatment
system formed in the delayed coker to return them to the circulating water
system hydraulic decoking
The studies on laboratory and industrial plants coking shown ways of
obtaining high-quality electrode coke , in particular coke satisfies the technical
requirements TC 0258-128-00148636-2003 " Cox electrode for the aluminum
industry" , while reducing the coking cycle to 18 hours.
Obtained raw mix of coking : AVT- tar 6-60 % , tar - AVT 1-30 % , heavy
pyrolysis resin 10 % , allows to improve the quality of the electrode coke and
recommended mode with reduced its coking coking cycle of 18 hours. [ 3 ]
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 extract oil , the rise in temperature at the exit
of the oven at 80 ° C and the improvement of the thermal regime of the reactor
by reducing the temperature difference between the its top and bottom 12 ° C.
It was established experimentally that the maximum possible increase in
lump fractions in the total coke is achieved by stepwise method screw it
hydroremoval with trimming, at an inclination to the horizontal nozzles
hydrocutter 15 °
The introduction of improved methods and tools hydroremoval coke on USI
21-10 / ZM will increase the productivity of coke hydroremoval 1.5 times lower
specific consumption of water and electricity by 1.6 times and increase output
electrode fractions ( greater than 8 mm) by more than 5% will improve the
performance of the delayed coker feedstock as a whole while reducing the coking
cycle to 18 hours. [ 4 ]
References:
1.
Syunyaev Z.I.
Production, upclassing and use of oil coke / Z.I. Syunyaev. – М: Chemistry. – 1973. – 295 pages.
2.
Kapustin S.M.,
etc. Chemistry and technology of fuels and oils. M, Chemistry,
No. 4, page 38-39.
3. Zaytseva N. P., etc. Chemistry and technology of fuels
and oils. M, Chemistry, 1980, No. 4, page 38-39.
4. Doshlov O. I., Doshlov I.O., Krylova M.P. New
technologies of gas, oil industry, power and communication. Collection
of works. Volume 20. Irkutsk, 2011, page 220-223.