Hydrocarbon Processing - July 2021 - 18

Project
Optimization
M. CAPRA
Aggreko Process Services EMEA, Klundert, The Netherlands
Improve propylene recovery at FCC and DCU
gas plants with mobile industrial refrigeration
Polypropylene demand remained strong through the 2020
pandemic crisis and is booming in the Asia region, driven by
strong Chinese import growth. Consequently, propylene did
not suffer the same weak demand and increased volatility experienced
by fuels. As polymer grade propylene prices favorably
stepped up, reaching $870/t by the end of November 2020, the
collapse of the fuels market generated a cash flow shortage across
the refining industry: projects and turnarounds were delayed,
capital investments cancelled and general spending was reduced.
Refineries contribute approximately 30% of the global propylene
supply-taking advantage of this short-term market
opportunity by quickly enhancing the recovery yield of this
valuable olefin secures additional marginal value to sustain
overall profitability.
In the present context, industrial mobile refrigeration for
lease is a strong response to these limited favorable market conditions,
as solutions are easily deployable, project time schedules
are extremely short, no capital investment is necessary, and
solutions are tailor-made for specific plants. Additionally, the
risks of financial failure are minimized because leasing costs
can be terminated as soon as the benefits decline, so no unproductive
capital assets will be retained at project termination.
Optimize the costs/benefits ratio. Considering cash constraints
and propylene trading prices, one necessary condition
for success is for refiners to partner with industrial refrigeraWGC
intercooler
CW
2,430 kW
348,540*
21,774
M.F. OVHD
M.F. condenser
147,241*
2,028
Reflux to M.F.
0C
Flow kg/h
C3= kg/h
129,315
Light naphtha
CW
Debutanizer
Trim cooler
FIG. 1. Gas plant at initial conditions.
18 JULY 2021 | HydrocarbonProcessing.com
265,980
46,679
41,445 kW
CW
15,297 kW
1,741 kW
L.P.
receiver
1st stage
WGC
1,808
100,590
1,386
Stripper
condenser
4,873 kW
CW
44
4,054 kW
79,793
18,360
2nd stage
WGC
1,209
30,000
130.590
1,386
34,248
12,293
Absorber
151,237
12,715
H.P.
receiver
11,177 kW
Stripper
195,732
18,781
230,682
34,386
159,315
Debutanizer
51
57
40
36,417
18,781
C3= separation
tion specialty rental companies skilled in evaluating the impact
of improved utility conditions on propylene recovery yield and
overall project profitability.
The structure of typical gas recovery plants equipped with
fluid catalytic cracking units (FCCUs) and delayed coking units
(DCUs) is represented in FIG. 1. Extra refrigeration can be applied
to the water coolers in the process: the stripper condenser,
FCCU/DCU main fractionator condenser, stabilized naphtha
trim cooler, sponge oil cooler and eventually the primary absorber
condenser and top/bottom pumparounds, when present.
The maximization of the benefits/costs ratio clearly
implies testing how sensitive the propylene recovery yield improvement
is to extra-refrigeration applied in the above listed
water coolers. This analysis is generally conducted on every gas
plant under examination and indicates the most convenient water
cooler on which to apply external refrigeration.
The case study presented here was engineered in four
weeks-including the customer's hazard and operability
(HAZOP) analysis-and deployed in two weeks as the tie-ins
to connect the refrigeration solution were present already.
Gas plant case study. The gas plant, processing the overhead
(OVHD) of the FCC main fractionator, was operated
with cooling water available at 28°C and ambient air at 30°C.
Downstream of the primary absorber, the sponge absorber
(not indicated in FIG. 1) has a very low recovery efficiency of
13,601
964
34,950
15,604
Sponge
absorber
http://www.HydrocarbonProcessing.com

Hydrocarbon Processing - July 2021

Table of Contents for the Digital Edition of Hydrocarbon Processing - July 2021

Hydrocarbon Processing - July 2021 - Intro
Hydrocarbon Processing - July 2021 - Cover1
Hydrocarbon Processing - July 2021 - Cover2
Hydrocarbon Processing - July 2021 - 3
Hydrocarbon Processing - July 2021 - 4
Hydrocarbon Processing - July 2021 - 5
Hydrocarbon Processing - July 2021 - 6
Hydrocarbon Processing - July 2021 - 7
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Hydrocarbon Processing - July 2021 - Cover3
Hydrocarbon Processing - July 2021 - Cover4
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https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020_v2
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201909
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201901
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201811
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201810
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201809
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201801
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