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reducing exhaust gases from internal combustion engines.
The heart of the exhaust aftertreatment system is a ceramic "wall-flow" filter coated with precious metals. The precious metals provide for the conversion of soot into harmless substances. The system allows for a reduction of: Soot> 95%, Hydrocarbon> 95%, Carbon monoxide> 99%
To monitor the behavior of the exhaust aftertreatment system, Diemma BV provides a control system, known as the “data logger”, which allows to measure at any time the counter-pressure and the temperature. In case of a fault, this control system provides both an acoustic as well as a visual signal and gives the corresponding error code.
This filtering system is designed to be applied to "cold" diesel engines. By this we mean the diesel engines that are not heavily taxed such as forklifts, cranes or lifts. The BWF system consists of a "wall-flow" filter element preceded by a diesel burner. The diesel burner ensures complete combustion of diesel soot filtered. The entire process takes less than 20 minutes and can be easily performed during a lunch break. This system is designed to allow at least 8 working hours before it needs to be regenerated.
Our DWF filters are coated with a catalytic coating (this is the same as the catalyst under a car). The coating ensures that the soot, which normally oxidizes (burns) only at temperatures above 600 ⁰ C, oxidizes at a temperature of 275 ⁰ C. Here, it is possible to use a self-regeneration of the soot filter to get the appropriate temperature. The black carbon produced by the engine at a temperature> 275 ⁰ C is directly converted into carbon dioxide and other harmless gases. If the exhaust temperature is below the 275 ⁰ C, the soot produced by the engine is stored in the filter and oxidized when the temperature permits it. In order to run smoothly and without any problem, we require the machine exhaust temperature > 275 ⁰ C for at least 30% of the operating time. The coating on our filter has an extra characteristic, the unburnt hydrocarbons generated at the start of the engine are stored in the coating and then released at a temperature of 250 ⁰ C with the result that the temperature in the filter shoots up above 300 ⁰ C which makes the self-regeneration process in our filter work better than that of others. Our system starts already working at an exhaust temperature of 250 ⁰ C.
The SCR system is a catalyst which, with the aid of urea (Ad-Blue), reduces the NOx produced by the diesel engine. By means of an electronic control system, the urea is added to the exhaust gases after the engine, but before the exhaust gases get to the SCR catalyst. This process allows to convert the NOx in the catalyst into the harmless nitrogen.
Diesel oxidation catalysts allow for the reduction of the harmful gases, hydrocarbons and carbon monoxide. With the aid of a chemical process in the catalyst, these harmful gases are converted into water vapor and carbon dioxide. Diemma BV supplies catalysts for every type of diesel engine from large to small. A standard oxidation catalyst converts the harmful gases of petrol, LPG or CNG engines. A three-way catalytic converter goes a step further as the standard catalyst by also reducing NOx.
Overpressure Systems are designed for the safety of your employees. When your employees make use of machines in for instance demolition tasks, dredging or storage, there is a big chance that they come in contact with contaminated air. Protection against these harmful substances or fumes becomes therefore a necessity. Diemma BV offers various solutions that guarantee that no polluted air or particulate matter can penetrate the cabin. Our systems guarantee clean air and meet the government-established requirements.
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