Transcript Diesel Emissions Retrofit

Reducing harmful emissions while
protecting Fleet Investment.
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“Diesel Emissions Reduction Act 2006” (DERA)
amended the ECL. DERA provides exemptions
for some off road vehicles/equipment.
ECL 19-0323 added: “Use of Ultra Low Sulfur
Diesel Fuel & Best Available Technology by the
State”
Part 248 regulations enacted July2009. How
will this affect compliance and reporting?
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DOC (Diesel Oxidation Catalyst)
PCRT (Partial Filter)
CCRT (Continuously Regenerating
Technology)
DPF (Diesel Particulate Filter)
APF (Active Particulate Filter)
PPF (Passive Particulate Filter)
CCV (Closed Crankcase Ventilation)
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Diesel Oxidation Catalyst – DOC- Simple in
line muffler conversion that reduces particulate
matter (PM) 25-40%. Low maintenance and
cost about $1500 per unit. Tier 1 Technology
Diesel Particulate Filters - DPF- complex
emissions reduction systems that reduce PM
up to 95%. Proper maintenance is critical to the
operation of these systems. Minimum cost $812,000 per unit. Require passive or active
regeneration.
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Passive regeneration happens automatically on
over the road trucks when the exhaust system
maintains a minimum temperature of 250-290
degrees centigrade for at least 35-40 % of the
trucks operation. (Duty cycle)
Active regeneration requires manual
intervention , either on the truck/equipment or
off board through an external heat source.
Most trucks and equipment that operate locally
or for short on/off durations require some
form of active regeneration.
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On board - The DPF collects soot which needs to
be burnt off to prevent back pressure. The DPF
sends a signal to a control module to activate an on
board external fuel fired heater to burn off the
soot. The heater heats the exhaust to 1200 F to burn
off the collected soot. Requires about 45 minutes
continuous run time.
Off board – this process can utilize an on board
heater connected to an external electric outlet for
5-6 hours or can require the DPF to baked in an
external unit for 30-60 minutes + removal and
reinstallation time. Total 3-4 hours.
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Regeneration intervals can’t be controlled.
Intervals will be determined by duty cycles.
Due to the high heat created by the on board
regeneration .additional radiator and clutch fan
capacity may be necessary.
Diesel fuel is used to fire the heater and the
clutch fan may diminish horsepower.
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Off board scheduling and time constraints limit
this as a viable option.
Regeneration should not occur during
refueling or inside buildings with low ceilings.
Depending on exhaust stack location,
regeneration should not occur in high grass ,
near low trees and shrubs, or near any other
flammable object.
Driver training is imperative to prevent
problems.
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PM ≥ 20%
CO ≥ 90%
HC ≥ 90%
Versatile Installations
Fuel Tolerant
No Maintenance
Low Cost Solution
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http://www.epa.gov/otaq/retrofit/veriflist.htm
http://www.arb.ca.gov/diesel/verdev/vt/cvt
.htm
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Sample beginning inventory of 2769 units to be
retrofitted, retired or replaced. 686,155,155=996.
Performing duty cycle testing is critical to
determine what technology to use.
Exhaust Gas Recirculation- most engines
produced in the last 5-6 years use EGR. They
are cleaner than the previous engines so there
are limited options to install on these engines.
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Continue to perform duty cycle tests and
install DOC’s where permissible. IF DPF’s are
required we will contract for a complete and
warranted installation.
2010 engines will require SCR technology to
reduce Nox emissions. On board Urea injection
system.
Natural gas engines meet 2010 emissions
without using DPF’s or UREA.
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Selective Catalytic Reduction – Uses Diesel
Exhaust Fluid (urea) injected into the exhaust
to reduce NOX.
DEF/Urea distribution is already in place.
Fuel mileage will increase slightly.
Advanced EGR does not meet the tailpipe NOX
emissions requirement. Previously earned
credits allow these engines to be sold legally.
Fuel mileage will decrease slightly.
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Natural gas engines can produce as much
horsepower as diesel and can be more efficient.
Natural gas costs $1.00 -2.00 less per gallon
equivalent..
Liquified Natural Gas is the most efficient
method of storage for heavy duty vehicles.