Title: Method for reducing pressure drop through filters, and filter exhibiting reduced pressure drop

Abstract

Methods for generating and applying coatings to filters with porous material in order to reduce large pressure drop increases as material accumulates in a filter, as well as the filter exhibiting reduced and/or more uniform pressure drop. The filter can be a diesel particulate trap for removing particulate matter such as soot from the exhaust of a diesel engine. Porous material such as ash is loaded on the surface of the substrate or filter walls, such as by coating, depositing, distributing or layering the porous material along the channel walls of the filter in an amount effective for minimizing or preventing depth filtration during use of the filter. Efficient filtration at acceptable flow rates is achieved.

Inventors:

Sappok, Alexander; Wong, Victor

Issue Date:

2014-11-18

Research Org.:

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1164034

Patent Number(s):

8889221

Application Number:

13/915,014

Assignee:

Massachusetts Institute of Technology (Cambridge, MA)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D2273/12 - Influencing the filter cake during filtration using filter aids
B01D2258/012 - Diesel engines and lean burn gasoline engines
B01D2239/0471 - Surface coating material

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F01N3/029 - by adding non-fuel substances to exhaust
F01N2900/1606 - Particle filter loading or soot amount
F01N2610/03 - the substance being hydrocarbons, e.g. engine fuel
F01N3/0296 - {having means for preheating additional substances}

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D46/0057 - {Regenerating the filter material in the filter

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F01N3/0293 - {injecting substances in exhaust stream}
F01N3/022 - characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D46/2455 - {of the whole honeycomb or segments, e.g. elliptic body, octagonal segment, centre of gravity}
B01D46/2418 - {Honeycomb filters

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F01N2610/12 - the substance being in solid form, e.g. pellets or powder
F01N2610/00 - Adding substances to exhaust gases

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D39/2093 - {Ceramic foam}

F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL

F01N3/023 - using means for regenerating the filters, e.g. by burning trapped particles

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DOE Contract Number:  

AC0500OR22725

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES; 36 MATERIALS SCIENCE