Emissions control systems for today’s air quality standards
CleanAIR Systems FAQs
- What is the best way to control particulates, soot or black smoke?
- We recommend the CleanAIR PERMIT™ Filter. Depending on the application and the type of fuel you are using, the CleanAIR PERMIT™ Filter can reduce particulate matter by over 85%. This will substantially decrease soot or visible black smoke from your exhaust.
- What is regeneration and why is it important?
- Diesel particulate filters are efficient at collecting PM from diesel exhaust, resulting in a considerable amount of build-up within a few hours of operation. To clean the filter or reduce build-up, it is necessary to oxidize the solid carbon-based PM into gaseous carbon dioxide. This process is called regeneration. It is primarily dependent upon the type of catalyst applied to the diesel particulate filter, exhaust gas temperature and fuel sulfur content.
- What is the difference between a DOC (diesel oxidation CONVERTER) and a diesel particulate filter?
- A DOC is classified as a flow-through emissions control unit, having large open channels that allow exhaust gases to pass through unobstructed. Emissions reduction is achieved when exhaust gases interact with the catalyst coating on the channel walls. DOCs are primarily used to reduce carbon monoxide, hydrocarbons and, to a lesser degree, PM.
A diesel particulate filter is classified as a wall-flow filter, containing alternating blocked channels that force exhaust gas through its porous walls, capturing PM. Diesel particulate filters are used for the reduction of particulate matter, carbon monoxide and hydrocarbons.
For more information on the CleanAIR ASSURE™ DOC or the CleanAIR PERMIT™ diesel particulate filter, contact our technical sales staff at 505-474-4120, 800-355-5513 or information@cleanairsys.com. - Why is fuel sulfur content important?
- During the combustion process inside a diesel engine, sulfur in the fuel is oxidized into SO2. Further oxidation of SO2 to SO3 can take place over a catalyst in the exhaust stream. The SO3 combines with water to form sulfuric acid which is considered a particulate. Minimizing the oxidation of SO2 can be achieved by using the right catalyst or by reducing sulfur levels in the fuel.
Successful regeneration occurs at lower exhaust temperatures when the sulfur content of fuel is decreased. - How will I know if the fuel I am using is ultra-low sulfur diesel?
- The designations for diesel fuels as define by the American Society for Testing and Materials (ASTM) standard D975 Table 1 are:
S15 = 15 ppm maximum sulfur content (also known as ULSD)
S500 = 500 ppm maximum sulfur content
S5000 = 5,000 ppm maximum sulfur content
Values in other areas of the world may be different for ULSD. The Canadian diesel market uses the same designations of S15, S500, S5000. - How do I control NOx in a diesel or lean-burn engine?
- NOx is formed when nitrogen (N2) and oxygen (O2) are combined at high temperatures during the combustion process. To reduce NOx in the exhaust stream, nitrogen and oxygen must be separated. This is achieved by using selective catalytic reduction (SCR).
The reduction of NOx is facilitated by the installation of a SCR catalyst combined with a reducing agent that is injected into the exhaust stream. The reducing agent reacts with NOx over the SCR catalyst to produce nitrogen (N2) and oxygen (O2). Ammonia is the typical reducing agent used and is often introduced into the exhaust as urea.
The CleanAIR EDURE™ SCR Catalyst significantly reduces NOx in diesel engines. For more information on the ENDURE™ SCR Catalyst, contact our technical sales staff at 505-474-4120, 800-355-5513 or information@cleanairsys.com. - Which CleanAIR product should I use?
- Each application and situation is different. Many factors need to be discussed in order to determine which CleanAIR product would be the best fit for your vehicle, stationary engine or power generation facility. We recommend contacting the CleanAIR technical sales staff with the specifics of your application and the emissions control problem that needs to be addressed. In this way, we can identify the correct CleanAIR product to meet your emissions and design requirements. For more information you can reach us at 505-474-4120, 800-355-5513 or information@cleanairsys.com
- How long do your products last?
- Life span of any particular product varies with use, fuel and engine condition. If properly maintained according to CleanAIR specifics detailed in our operations manual, most products will have a life span of several years.
- How much will it cost?
- We understand each job is unique, with its own set of requirements, designs and equipment specifications. For more information or a price quote, contact the CleanAIR technical sales staff at 505-474-4120, 800-355-5513 or information@cleanairsys.com.
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