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July 05, 2011  |   Comments (1)   |   Post a comment

The Latest in Emission-Control Technology

From diesel particulate filters to diesel oxidation catalysts to crankcase filtration systems to a hybrid system, there are numerous products available to the industry. Their emission-reduction capabilities range from 20 to more than 90 percent, and they can be applied to a variety of engines and school buses.

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Cleaire Advanced Emission Controls’ Long-Mile diesel particulate filter can reduceparticulate matter by more than 85 percent. Itslow exhaust temperature requirement makesit compatible with lighter duty cycles.

Cleaire Advanced Emission Controls’ Long-
Mile diesel particulate filter can reduce
particulate matter by more than 85 percent. Its
low exhaust temperature requirement makes
it compatible with lighter duty cycles.

In conjunction with transporting students to and from school safely, many pupil transporters are passionate about working to ensure that the air students breathe around buses is clean.

From diesel particulate filters (DPF) to diesel oxidation catalysts to crankcase filtration systems to a hybrid system for school buses, there are numerous products available to the industry that reduce buses’ particulate matter and emissions output.

SBF spoke with officials from four companies about their products’ features and specifications.

Cleaire Advanced Emission Controls LLC
Cleaire Advanced Emission Controls offers four DPFs that can be used as a retrofit solution for school buses: the LongMile®, the Horizon®, the Vista™ and the Longview.

Kevin Harris, business development manager, says the Horizon is the most popular model, but the company believes the LongMile will soon become the more popular option.

Both DPFs have been verified by the California Air Resources Board (CARB) to reduce particulate matter by more than 85 percent, and they have a modular design that facilitates service and de-ashing.

The Horizon is an active DPF with electric heater regeneration. It is verified for use in engine model years 1960 to 2006, but it cannot be used in two-stroke engines.

The LongMile DPF is a passive system that uses an exclusive sintered metal filter. It is verified for use in engine model years 1993 to 2006.

Harris says there are several features that differentiate the LongMile from other passive DPFs.

“For passive systems, you need to have a certain exhaust temperature profile, and typically it can be 260 degrees Celsius for 25 percent of the time. With the LongMile, it’s 260 degrees Celsius for only 7 percent of the time,” he explains. “This low exhaust temperature requirement provides broader engine coverage and greater operating flexibility for the fleet.”

In addition, the LongMile’s low backpressure makes it compatible with many engine applications, especially those with exhaust gas recirculation (EGR) technology. Finally, its high ash capacity extends filter deashing/cleaning by three times compared to channel wall-flow filters.

Harris notes that a school bus equipped with a well maintained and properly working engine will enable all of the DPFs to work more effectively and reduce maintenance.

“With a poorly tuned engine, the filter is going to fill up more quickly than with a well maintained engine. This means that you’re going to have to regenerate more often or clean out the filter more often,” he says.

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Read more about: emissions, engines, EPA, hybrid bus, IC Bus, Thomas Built Buses

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It has been said so many times, "Our students are the most valued end users of the total transportation network." This fact remains true year after year. Any money spent to protect our students is like an investment in the future of our country. Emission control devices, such as mentioned in this article, are certainly a worthy investment. This investment however, is not a single purchase and forget item. Routine maintenance of not only the engine but the emission control device will greatly prolong the designed intent of the investment in reducing pollutants into the atmosphere and protecting our young and future. The "ash" load, or the build up of ash in the DPF, will over time cause the device to fail and require replacement. As the DPF fills with ash during normal, expected operation an increase in engine back pressure is experienced which reduces fuel efficiency. The increased cost to fuel and operate school busss in your fleet could be allocated to other beneficial expenses. A good rule of thumb is to have the DPF removed and cleaned at least annually. For the most part North America has idled a significant number of school busses for the summer break. Now is the time to address the ash build up in the DPF or clean and renew the oxidation catalyst (DOC) for your fleet of busses. DPF Cleaning Specialists is a company that can work with fleets to maximize the effectiveness of both the DPF and the DOC, reduce engine back pressure and provide preventive maintenance guidelines. Consider taking advantage of this idle time to address these emission control devices.

DPF Cleaning Specialists    |    Jul 07, 2011 05:08 AM

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