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Find out how Maxx Air Group's emission reduction technologies can help green your fleet
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Diesel Emissions Overview Phillip Surma
Bus Retrofit Overview
• Maxx Air Group Introduction
• Diesel Filter Technology Profiles
• Engine Performance Profiles
• DPF Selection
• DPF Tips
Maxx Air Group Introduction
• Maxx Air - West (California)– Sales, Installation, Service, DPF Cleaning
• Maxx Air – Midwest (Illinois)– Sales, Installation, Service
• Emission Control Technologies– R&D, Fleet Consulting & Management Services
• QuickClean – DPF manufacturing
Maxx Air Group Introduction
• Consulting and Technical Expertise on All Types of Diesel Particulate Filter Systems
• Grant Application Assistance
• Data Logging and Opacity Testing
• Quality Installations • Maintenance Services • Diesel Particulate Filter Cleaning and
Testing
Maxx Air Group Introduction
Product Portfolio
•Hug DPF Filter Systems
•ECS DPF Filter Systems
•KwickClean Filters
•Huss DPF Filter Systems
•CPK Data Loggers
•Diesel Pre-heaters
Diesel Filter Technology Profiles
DPF (substrate) Types•Partial or Flow Through Filters
•15% to 60%
•High Efficiency Wall Flow Filters
•85% to 98%
Diesel Filter Technology Profiles
Regeneration Types
•Passive
•Passive / Active (engine on)
•Active (engine off)
•Off Line
Diesel Filter Technology Profiles
Oxidation Catalysts (DOC)
A diesel oxidation catalyst consists of a stainless steel canister that contains a honeycomb structure called a substrate. The interior surfaces are coated with catalytic metals such as platinum or palladium. It is called an oxidation catalyst because the device converts exhaust gas pollutants into harmless gases by means of chemical oxidation.
Diesel Filter Technology Profiles
Passive DPF
To facilitate decomposition of the soot, a catalyst is used in the form of a coating on the filter. Filters that regenerate in this so-called "passive" fashion cannot be used in all situations. Despite the high efficiency of the catalyst, a layer of ash may build up on the filter requiring replacement or servicing. The ash is made up of inorganic oxides from the fuel or lubricants used in the engine and will not decompose during the regular soot regeneration process.
Diesel Filter Technology Profiles
Passive / Active (engine on)
In some applications or operating cycles, the exhaust never achieves a high enough temperature to completely oxidize the soot even in the presence of a catalyst. In these instances, an "active" regeneration system must be employed. Active regeneration utilizes a fuel injector nozzle upstream of the DOC element to heat the filter and oxidize the soot.
Diesel Filter Technology Profiles
Engine off active regeneration utilizes a fuel burner or a resistively heated electric element to heat the filter and oxidize the soot. Active regeneration can be employed either in-place on the vehicle or externally.
Active (engine off)
Diesel Filter Technology Profiles
Typical Active DPF installation
Diesel Filter Technology Profiles
The filter element of the KwikClean soot filter consists of a ceramic fiber knitted mesh, reinforced with a stainless steel core. This design makes it resistant against high temperatures without losing its flexibility.The filter module is fitted into the filter housing and held by a quick-release clamp for easy change out.
Off-Line (Removable)
Engine Performance Profiles
Data Logging
•Data logging of the exhaust temperature, back pressure, and duty cycle is needed to determine the correct DPF technology for a given vehicle or group of vehicles in your fleet.
Engine Performance Profiles
High Heat & Heavy Duty Cycle
Low Heat & Light Duty Cycle
DPF Selection
Engine
ModelYear
TemperatureProfile
TechnologyType
Operator Interaction
In-UseRegeneration
NoOperator Action
15% - 40% Duty Cycle400-520o F
Engine onRegeneration
NoOperator Action
Engine OffRegeneration
RequiresButton Push
5%-15% ofDuty Cycle>360o F
TemperatureNot A or B “Low Temp”
1994 to 2006
(2012)<1994
RebuildRepowerReplace
EngineA
B
C
Passive
Passive/ Active
Active
CustomFilterSolution
DPF Tips
• Match the correct emission system to the engine/duty cycle
• Use pre-heaters in cold startup conditions – don’t idle for warm-ups
• Perform de-ashing service using manufacturers recommendations
• Correct installation = best system performance
Maxx Air Group
Thank you