EXAMPLE OF
ENVIRONMENTAL PREVENTION PROBLEMS ON CATALYTIC CRACKING UNITS
Irincheev M.A.
Supervisor: Doshlov O.I.
National Research Irkutsk State Technical University
664074 Irkutsk, st. Lermontov 83, B-125, e-mail:
mr.irincheev@mail.ru
Grozny combined unit GK-3 (11 refinery plant JSC
"APCC") is intended for refining desalted and dehydrated and oil
products to yield intermediates, raw materials for other processes, whose goal
is to provide an additional amount of light fractions. Is currently one of the
leaders of emission of harmful substances into the environment.
In
order to protect the environment, we propose the following measures:
- To reduce industrial emissions of sulfur oxides on
the catalytic cracking unit in a fluidized bed catalyst regenerator introduced
PS-17. Initial loading of PS -17 catalysis 5-8 % by weight on the catalyst
circulating in the system, hereinafter uploading. The daily amount of 140-150
kg / day. The principle of operation of PS -17 catalyst is that part of the
metal oxide catalyst reacts with sulfur dioxide to form sulfides which are then
getting together with the regenerated catalyst to the reducing environment of
the reactor are decomposed with formation of hydrogen sulfide and metal oxide.
And hereinafter, "path", together with hydrogen sulfide cracking
reaction products are sent to a separation distillation column.
Catalyst caught by cyclones of first and second stage,
are injected into the fluidized bed regenerator.
- Position in the regenerator CC GK-3 for a long time
operated twelve groups of two-stage cyclone, which had no protective coating of
the inner surface, whereby there was a strong erosive wear inlet and the body
to form through holes.
In accordance with the results of calculation of gas
flow in the regenerator are eight groups of two-stage cyclones inner diameter
of the cylindrical portion of 1200 mm.
Selected geometric parameters of cyclones make it with
high dust collection efficiency, reaching a two-tier system for the whole 99.99%.
Due to this gas dust outlet from the regenerator does not exceed 105-120 mg/m3.
With such low catalyst losses eliminates the need for
a permanent return to the regenerator cyclones captured outrigger catalyst.
This very fine catalyst is advisable to accumulate in the hopper and
periodically export it to the dump.
Implementation highly erosion-proof cyclones
significantly improve the efficiency and reliability of the dust collection
system regenerator of CC GK-3 JSC "APCC".
- Installation of safety valves to protect the
equipment in case of pressure over predetermined technological standards;
- Control of gas concentration in objects 203;
- To prevent soil contamination when emergency spills
concreted area of technological platforms and enclosed rim;
- Drainage drains and straits with flanged sites
objects collected in the drain tank and then transported to the treatment plant
JSC "APCC".
- To monitor the quality of groundwater and oil
content in it are arranged by supervisory control wells (wells).
To capture oil from groundwater along the Angara River
in the territory of the refinery operates drainage system.
The proposed rehabilitation and replacement of the
catalyst to a more effective PS-17 will not only improve the process
technology, but also significantly reduce the emission of harmful substances
into the environment.
References
1.
Akhmetov SA Lectures on the technology of deep oil refining into motor fuels.
Textbook. - St. Petersburg. : Nedra, 2007. - 312c.
2.
Pokrovsky, SS "New foreign refining technology" / S.Pokrovsky / / Oil
and gas vertical . - 2002. - № 7. - P.68 -71. - S. 2002.
3.
Manavyan AK "Technology of primary oil refining and natural gas"
Textbooks for higher education. - 2nd ed. - Moscow: Chemistry, 2001. - 568.