In many situations, diesel exhaust gas only needs to have the particulate matter filtered out of it temporarily. A prime example of this is where new diesel vehicles need to be driven out of the factory where they have been made. Other examples are where vehicles are driven into and out of workshops for servicing. The periodic testing of emergency generators and fire pumps is another area where temporary filtration is advantageous.
Our temporary diesel particulate filters are designed to be removed from the application for periodic cleaning, which is done by burning off the accumulated soot. Because the exhaust temperature is irrelevant, they can be installed at the end of the exhaust system and are often connected to the tailpipe using flexible hose. In some situations they can be quickly connected to the exhaust tailpipe using an inflatable collar.
The need for cleaning is apparent when the ‘clean’ side of the filter turns black, but as an alternative an electronic backpressure monitor can be installed which warns the driver by either turning on a red light or sounding a buzzer.
To clean the filter, it is put into a kiln for several hours. We can do this on behalf of our customers if they keep a spare set of elements for use whilst one set is being cleaned. Alternatively we can supply the equipment so that customers can clean their own filters on site.
We supply this type of filter for engines up to 200 kW but multiple elements can be combined into a single unit for larger applications.