Diesel FAQ 1
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Diesel: Frequently Asked Questions This publication is issued by the Oklahoma Department of Environmental Quality as authorized by Steven A. Thompson, Executive Director. Copies have been prepared at a cost of $00.1035 each. Copies have been deposited with the Publications Clearinghouse of the Oklahoma Department of Libraries. fact sheets\air\DieselFAQs\DieselFAQs.indd 10_16_08. February 2012 Continued on next page Question 1: What is a diesel retrofit? Diesel retrofits are a type of control device that can be installed on diesel powered engines in order to reduce exhaust emissions. Diesel retrofit control technologies include diesel particulate filters (DPF), diesel oxidation catalysts (DOC), closed crankcase ventilation system (CCV), exhaust gas recirculation (EGR), selective catalytic reduction (SCR) devices, and lean NOx catalysts (LNCs). A DPF is a ceramic device that collects particulate matter in the exhaust stream. The high temperature of the exhaust heats up the ceramic device which allows the particles in the exhaust to break down, or oxidize, into less harmful components. A DOC is a device that uses chemical processes to break down pollutants in the exhaust stream into less harmful components. The device is made of a porous ceramic honeycomb-like structure that is coated with materials which catalyze a chemical reaction reducing harmful pollution. A CCV is designed to capture and return the crankcase gases that have leaked through the engine piston rings. These crankcase emissions can be substantial, thus a CCV is used to control the flow of gases and return the emissions to the engine for combustion. This effectively prevents the crankcase emissions from entering the atmosphere. Question 2: What are the benefits of DPF and DOC retrofits? DPFs reduce emissions of particulate matter 2.5 microns or smaller (PM2.5), hydrocarbons (HCs), and carbon monoxide (CO) by 60-90 percent. DPFs require the use of ultra low sulfur diesel fuel (ULSD). DOCs reduce PM2.5 emissions by about 30 percent as well as reduce emissions of HCs by 50 percent and CO by 40 percent. DOCs do not require the use of ULSD. CCVs reduce PM2.5 by 10-15 percent, HCs by 30-40 percent, and CO by 50-90 percent. Question 3: What is the cost of a diesel retrofits? DPFs cost between $4,000 and $10,000. The cost is dependent on the specific engine and operating characteristics, such as exhaust temperature. DOCs cost between $1,000 and $2,000. CCVs cost between $1,200 and $2,000.
|Okla State Agency||
Environmental Quality, Oklahoma Department of
|Title||Diesel : frequently asked questions.|
|Authors||Oklahoma. Department of Environmental Quality.|
|Publisher||Oklahoma Department of Environmental Quality|
Diesel fuels--Environmental aspects.
Diesel motor exhaust gas.
Automobiles--Motors (Diesel)--Environmental aspects.
|Purpose||Question 1: What is a diesel retrofit? Diesel retrofits are a type of control device that can be installed on diesel powered engines in order to reduce exhaust emissions.|
|OkDocs Class#||E4850.1 D564f 2012|
|Digital Format||PDF, Adobe Reader required|
|ODL electronic copy||Downloaded from agency website: www.deq.state.ok.us/factsheets/air/biodieselfs.pdf|
|Rights and Permissions||This Oklahoma government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders.|