Translation of "Partial-flow filter" in German

This partial flow filter is made of one filter which can be opened without tools.

The Dynamicfilter is normally arranged directly upstream of an object to be protected, such as a heat exchanger or an additional stage of filtration, or is installed as partial flow filter.

The first is the classic wall-flow filter [12, 13] and the second is Emitec's PM-METALIT TM partial- flow deep-bed filter, which passively regenerates on a continuous basis.

But since the filter is designed merely as a partial-flow filter anyway and merely a part of the overall recirculated coolant filter, this bypass of the filter insert 6 does not represent any relevant impairment of the filter function.

This may be either a closed particle filter, which includes a multiplicity of channels or passages that are alternately closed, or what is known as a partial flow filter, in the case of which part of the exhaust gas is conducted into a porous medium through the use of corresponding internal elements.

The filter material 2 is expediently implemented for filtering a partial or secondary flow and is therefore referred to in the following as partial or secondary flow filter material 2 .

An embodiment in which the ring filter element is implemented as a partial or secondary flow filter or includes such a filter is of special interest.

Emitec's PM-METALIT TM partial-flow deep-bed filter (figure 4) has been used in commercial vehicles and cars over the past two years.

The PR-BW 100-FC is normally arranged directly upstream of the object to be protected, or installed as partial flow filter.

Since, as a "Partial Flow Filter" system, it does not require regulation of any kind and there is therefore no need to interfere with the engine technology, the PM-METALITTM is extremely well suited for retrofitting to older diesel engines.

In this second position (position of regeneration), as it is shown FIG. 1C for the filter 7 and in FIG. 1D for the filter 8, the fluid is supplied by the fluid-supplying canal 4 in the direction of the arrow 14, then superfuses the filter 8 and emerges as filtered fluid downstream of the filter 8 in the connecting canal 6. Depending on the fact that the tool or the nozzle located downstream of the fluid-draining canal 5 build up a counter-pressure and that furthermore the total surface of the connecting canal outlet is not aligned with the fluid-draining canal, only a partial flow of the filtered fluid is drained over the fluid-draining canal 5, whereas a further partial flow superfuses the filter 7 in the opposite flow direction 14.

These advantages apply to all of the "turbulent" new products for gasoline and diesel engines mentioned below, from three-way catalysts and diesel oxidation catalysts to SCR systems for the effective reduction of NO x . In the case of SCRi TM, an "integrated SCR system", the PM-Metalit® functions both as a partial-flow diesel particulate filter and as a hydrolysis catalyst, making this new particulate filter/DeNO x system the first ever exhaust gas aftertreatment system capable of operating on a continuous basis.

It is a characteristic of all these variants that they are partial flow filters.

Designed for pressures of 25-450 bar, they are used as full or partial flow filters.

To achieve this object, the method described at the outset is characterized in that, in a first stage, the exhaust gas is divided into two partial flows, both of which are heated, with one of the partial flows being filtered at least once, preferably before heating; that the two partial flows are subsequently recombined; that, in a second stage, the exhaust gas is again divided into two partial flows, with one of the partial flows being heated even further than in the first stage, and with the other partial flow being filtered at least once; and that the two partial flows are subsequently recombined, and the concentration measurement is performed on the total flow.

In contrast, the filter effect of so-called partial flow filters is based on the passage of exhaust gas through fiber mats or the like, which are not disposed in the flow channels themselves, but in the neighboring channels.

Open separators or partial-flow filters, through which an exhaust gas can pass without the exhaust gas having to pass through a filter wall, are preferred.

The fluid entering over the fluid-supplying canal 4 in the direction of the arrow 14 is firstly filtered over the filter 7 in its position of regeneration or its backwashing position, shown in FIG. 1D, whereby a first partial flow of the filtered fluid is drained from the device 1 over the fluid-draining canal.

Depending on the counter-pressure a second partial flow of the filtered fluid flows in the opposite flow direction 14 of the fluid during the filtering process and superfuses the filter 8, which leads to the fact that correspondingly deposited particles are removed from this filter, so that subsequently a soiled fluid can be led over the drain canal 10 from the section 15 of the connecting canal into the atmosphere.