Vahid Hosseini , Mahdi Doozandegan , , Aidin Akbarzadeh · 2017-07-18 · Vahid Hosseini 1, Mahdi...
Transcript of Vahid Hosseini , Mahdi Doozandegan , , Aidin Akbarzadeh · 2017-07-18 · Vahid Hosseini 1, Mahdi...
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Vahid Hosseini1, Mahdi Doozandegan1,2, Aidin Akbarzadeh3
1- Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran
2- ASA, Official VERT office of Iran
3- Mayan Industrial & Manufacturing Co
21st ETH-Conference on Combustion Generated Nanoparticles
June 19th – 22nd 2017, Zurich, Switzerland
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Table of content
• Background of particle pollution and DPF implementation in Tehran
• A novel OEM approach for Iran’s applications
• RDE evaluation of the system with PEMS
• Durability runs
• DPF and DOC cleanup procedures
• Concluding remarks
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Pictures from Tehran
• Population: 8.5 million
• 4 million LDVs and motorcycles all gasoline and CNG
• 130,000 HDVs, all diesel 1
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History of legislations
• DPF subject was started in Iran in 2014
• Since then, there is a national legislation for Euro IV+DPF for new diesel vehicles starting Sep 2016
• Later on European OEMs lobbied for Euro V EEV to be added to legislation.
• There is a legislation for all public vehicles in 8 large Iranian cities (30+ million inhabitants) to be retrofitted to DPF
• There is a city council legislation in Tehran for soot purchasing scheme (paying more to contractors if they have filters on their diesel vehicles)
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Tehran DPF retrofit project
• Pilot tests are running since 2014 (10 buses, 6 technologies)
• 50 buses now retrofitted to filters
• The project move forward despite of technical obstacles and resistance of operators
awareness and outreach Pilot tests, local conditions new
products
are coming
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International events
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General Specification
Fuso Canter
Engine model 4P10-8AT4
Engine volume 3 Liter
Engine output 110 kW
Max torque 370 N.m
Emission level EURO V
Emission reduction
technology
EGR+DPF
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DPF System and regeneration strategy
• Full flow silicon carbide DPF.
• The regeneration process is a quasi passive.
• Passive regeneration mechanism is DOC-CRT
• The active regeneration is a combination of early post injection, temporary EGR
deactivation, and idle speed increase
• automatic and manual active regeneration
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Regeneration strategy
• DPF regeneration mechanism consists of 3 main sequential steps:
1- CRT is working when the fuel sulfur level is low
2- Instantaneous automatic regeneration when CRT is not fully working,
o Early post injection
o Temporary EGR deactivation
o Temporary increase of idle speed from 600 rpm to 800 rpm
3- Manual Regeneration by the operator if there is still back pressure problem
o Late post fuel injection
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Regeneration strategy
Automatic regeneration Manual regeneration 9
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Instrumentation
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Test procedures
• Besides Iranian normal driving cycle, some steady- speed tests
and half load points also were added to the test procedure.
Steady-speed points
Iranian driving cycle Half loads points
Stage 16 Stage 13 Stage 14 Stage 15
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Sampling
• Sampling was done w and w/o DPF installed
Replaced pipe instead DPF DPF system
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Test route
Length = 100 km
Elevation = 1200 meter above sea level 13
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PM results (g/km)
Averaged values: With DPF: 0.003 g/km Without DPF: 0.0128 g/km
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NOx (g/km)
With DPF: 1.08 g/km Without DPF: 1.34 g/km Results:
Small reduction was
observed in NOx values
because of internal EGR
which was caused by DPF
back pressure
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CO (g/km)
With DPF: 0.07 g/km Without DPF: 0.66 g/km
Results:
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PN measurement
• PN measurement was done at three different idle speeds
PN _ efficiency> 99%
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Durability test- basic information
• 50,000 km road test
• 2 trucks
• Duration of 4 months and 3 routes
• Various fuel sulfur content from 44 ppm to 8,180 ppm
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Fuel Map (sulfur content)
Sulfur content
• Large cities < 50 ppm
• Roads and remote areas
up to ~8000 ppm
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Durability results
• No manual regeneration was required within 50,000 km road test.
• As average, instantaneous automatic regeneration had been deployed every 600 km.
• This interval for instantaneous automatic regeneration is almost every 4,000 km, while operating with Euro IV diesel.
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Challenges due to high sulfur diesel fuel
• In brief, in spite of using of highest oil quality level i.e. API CJ4 which is recommended for DPF equipped engines, oil had degraded considerably due to high sulfur content.
• Higher backpressure operation as the result of fuel sulfur content (DOC deterioration), turbocharger cooling oil penetration into engine intake
• Several post fuel injection leads to engine lube oil dilution by diesel fuel and rapid oil deterioration
• Based on effect of high sulfur content, level of metal elements increased considerably that is a clear sign of high corrosion and wear of engine components.
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Worst case scenario – 2nd round of road test
• Driving in dense city traffic jam with frequent start and stop and low speed.
• -Drivers are instructed to drive in very low vehicle speed and high gears to cause minimum engine speeds.
• Whole test in EVM condition (3,980 kg).
• 6,000 L of very poor diesel with sulfur content of around 6,000 ppm was stocked in a tanker in origin point of daily hauling to guarantee running under highly poor fuel quality during the whole test.
• Engine is being switched off during night time for 8 hours every day.
• This testing condition is called 2nd round of the road test
• This round of the test was covered from 51,586 km till 54,405 km i.e. ~ 2,800 km
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Routes
Pure city driving, mostly in most dense and heaviest traffic jam.
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DPF Regeneration
1 manual Reg. was requested by ECU in 1st week of this round of the test. 4 automatic regeneration and no manual regeneration have been deployed in 2nd week. Regeneration interval is reduced drastically in 2nd week of the test (from ~600 km to ~250 km)
0
1
2
52'000 52'500 53'000 53'500 54'000 54'500 55'000
No
. o
f R
ege.
Mileage (km)
No. of Reg
Automatic Reg.
Manual Reg.
0
1
2
3
4
5
6
7
8
52'000 52'500 53'000 53'500 54'000 54'500 55'000
Acc
No
of
all R
eg.
Mileage (km)
Acc No of all Reg. (Automatic/Manual)
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7-steps for cleaning procedure
• Step 1: DPF evaluation before the cleaning.
• Step 2: Separating DPF and DOC.
• Step 3: DPF cleaning.
• Step 4: DOC poisoning evaluation.
• Step 5: DOC desulfurization.
• Step 6: Evaluation of DOC activity after desulfurization.
• Step 7: Cleaning efficiency measurement
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DOC desulfurization
0
50
100
150
200
250
300
350
400
450
500
550
600
0 20 40 60 80 100 120 140 160
Oven
tem
per
ature
(C
)
Time (minutes)
DOC desulfurazation heat management
Purged
with
compressed
air
Before cleaning
After cleaning
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Evaluation of DOC activity after desulfurization
32%
53%
58%
55%
44%
36%
22%
10%
4%
0%
10%
20%
30%
40%
50%
60%
70%
250 275 300 325 350 375 400 425 450
NO
2\N
Ox r
atio
(%
)
Temperature (C)
NO2/Nox -before cleaning NO2/Nox -after cleaning
1.6% -0.6%
3.0%
6.3%
8.5%
22.0%
15.1%
9.9%
3.8%
-5.0%
0.0%
5.0%
10.0%
15.0%
20.0%
25.0%
250 275 300 325 350 375 400 425 450
NO
2/N
Ox
dif
fren
ce (
%)
NO2/NOx diffrence, before and after thermal management
NO2/ NOx average increase:
7.7%
Temperature (C)
Considering DOC activity’s average values for before and after desulfurization, average
improvement was 29%.
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Cleaning efficiency measurement
the proposed procedure for
cleaning DPF was successful. Maximum 87 mbar and average
35.4 mbar showed the DPF was in very good condition after retrieval procedure.
0
50
100
150
200
250
300
350
400
450
500
1 2 3 4 5 6 7 8 9
Bac
k-p
ress
ure
(m
bar
)
Test stage
Pressure before cleaning Pressure after cleaning
Maximum allowable back-pressure: 370
mbar
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• Dire situation in Iranian mage-cities air with respect to PM10,
PM2.5 and BC requires immediate actions
• We cannot wait for nation-wide ULSD, we need DPF now
• Novel approaches based on old European experiences are needed (there are experiences of DPF with 1200 ppm sulfur diesel in Switzerland)
• Until full implementation of Euro VI level standard (fuel, oil, AdBlue infrastructure,…) Euro IV+DPF legislation must be supported at all levels
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Please visit our posters in UFP measurement in Tehran air and source
apportionment of Tehran PM2.5
#2 #3
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Zurich June 20, 2017
it is all about health effects
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Acknowledgement
• My colleagues at Sharif University, FCE, AQCC, ASA, VERT, and Mayan
• ETH 21st NPC 2017 organizing committee
• Dr. Andreas Mayer and Mr. Thomas Lutz