Filter and filtering arrangement

Abstract

A filter for filtering pyrolysis oil and an arrangement. The filter is a split-flow filter ( 1, 1 a, 1 b ), comprising a filter element ( 12 ), comprising plurality of apertures ( 17 ) extending through the filter element ( 12 ), a receiving channel ( 13 ) for receiving a flow (F) of pyrolysis oil to be filtered and for supplying said flow on first side (A) of the filter element ( 12 ), a main discharge channel ( 14 ) arranged on the first side (A) of the filter element ( 12 ) for discharging the portion of the flow (F) of pyrolysis oil having not penetrated through the filter element ( 12 ), and a filtrate channel ( 15 ) arranged on second side (B) of the filter element ( 12 ) for discharging the portion of the flow (F) of pyrolysis oil having penetrated through the filter element ( 12 ).

1 . A filter for filtering pyrolysis oil, the filter comprising:
 a filter element comprising a plurality of apertures extending through the filter element;   a receiving channel positioned to receive a flow of pyrolysis oil to be filtered and to supply said flow to a first side of the filter element;   a main discharge channel positioned on the first side of the filter element and positioned to discharge the portion of the flow of pyrolysis oil having not penetrated through the filter element, the main discharge channel and the receiving channel being positioned along a common axis; and   a filtrate channel arranged on a second side of the filter element for discharging the portion of the flow of pyrolysis oil having penetrated through the filter element.   
     
     
         2 . The filter as claimed in  claim 1 , wherein:
 the filter element is cylinder-shaped, and   the first side is arranged outside of the cylinder-shaped filter element.   
     
     
         3 . The filter as claimed in  claim 1 , wherein:
 the filter element is cylinder-shaped, and   the first side is arranged inside of the cylinder-shaped filter element.   
     
     
         4 . The filter as claimed in  claim 3 , wherein the first side is arranged inside of the cylinder-shaped filter element, the inner diameter of the filter element being equal to the inner diameter of the receiving channel. 
     
     
         5 . The filter as claimed in  claim 1 , wherein the filter element is planar-shaped. 
     
     
         6 . The filter as claimed in  claim 1 , wherein the filter element is cone-shaped. 
     
     
         7 . The filter as claimed in  claim 6 , wherein the first side is arranged outside of the cone-shaped filter element. 
     
     
         8 . The filter as claimed in  claim 6 , wherein the first side is arranged inside of the cone-shaped filter element. 
     
     
         9 . The filter as claimed in  claim 1 , wherein the plurality of apertures are either round, polygonal, or elongated apertures. 
     
     
         10 . The filter as claimed in  claim 1 , wherein the plurality of apertures comprise a slit-shaped aperture having two long and parallel sides. 
     
     
         11 . The filter as claimed in  claim 1 , wherein the plurality of apertures comprise apertures having edges raised from the filter element towards the first side of the filter element. 
     
     
         12 . The filter as claimed in  claim 1 , wherein the receiving channel is aligned parallel with the first side of the filter element. 
     
     
         13 . The filter as claimed in  claim 1 , wherein the main discharge channel is aligned parallel with the first side of the filter element. 
     
     
         14 . The filter as claimed in  claim 1 , wherein the filtrate channel is aligned orthogonal with the second side of the filter element. 
     
     
         15 . The filter as claimed in  claim 1 , wherein the filtrate channel is arranged to discharge a secondary flow that is in range of 1%-25% of the flow of pyrolysis oil received by the receiving channel. 
     
     
         16 . A filtering arrangement for filtering pyrolysis oil, comprising the filter as claimed in  claim 1 , wherein the receiving channel and the main discharge channel are connected via a heat exchanger to a circulation conduit that is connected to a condenser unit for cooling pyrolysis gas therein. 
     
     
         17 . The filtering arrangement as claimed in  claim 16 , comprising at least two filters, the filtrate channel of a first filter being connected to the receiving channel of the second filter. 
     
     
         18 . The filtering arrangement as claimed in  claim 17 , wherein:
 the filter element of the first filter is arranged to transmit larger particles than the filter element of the second filter; and   the filtering arrangement further comprises a return channel arranged to connect the main discharge channel of the second filter to the receiving channel of said second filter for feeding a return flow to said second filter, the filtrate channel of the first filter being connected to said return channel.   
     
     
         19 . The filtering arrangement as claimed in  claim 16 , comprising at least two filters, the main discharge channel of a first filter being connected to the receiving channel of the second filter. 
     
     
         20 . A filtering arrangement for filtering pyrolysis oil, comprising the filter as claimed in  claim 1 , wherein the filtrate channel is connected to an outlet conduit being arranged for transferring pyrolysis oil out from a pyrolysis plant to transporting means. 
     
     
         21 . The filtering arrangement as claimed in  claim 20 , wherein at least one of:
 the filtering arrangement further comprises at least two filters, the filtrate channel of a first filter being connected to the receiving channel of the second filter;   the filter element of the first filter is arranged to transmit larger particles than the filter element of the second filter; or   the filtering arrangement further comprises a return channel arranged to connect the main discharge channel of the second filter to the receiving channel of said second filter for feeding a return flow to said second filter, the filtrate channel of the first filter being connected to said return channel.   
     
     
         22 . The filtering arrangement as claimed in  claim 20 , comprising at least two filters, the main discharge channel of a first filter being connected to the receiving channel of the second filter.