WO2012041455A1 - Method and system for the removal of particulate matter in engine exhaust gas - Google Patents
Method and system for the removal of particulate matter in engine exhaust gas Download PDFInfo
- Publication number
- WO2012041455A1 WO2012041455A1 PCT/EP2011/004709 EP2011004709W WO2012041455A1 WO 2012041455 A1 WO2012041455 A1 WO 2012041455A1 EP 2011004709 W EP2011004709 W EP 2011004709W WO 2012041455 A1 WO2012041455 A1 WO 2012041455A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust gas
- filter
- soot
- engine
- ash
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0233—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
Definitions
- the present invention relates to a method and system for the for the removal of particulate matter in engine exhaust gas.
- the invention is useful for the removal of soot and ash being present in the exhaust gas from auxiliary engines, which are typically installed on ships.
- An essential feature of the invention is a continuously performed passive regeneration of a particulate filter being catalysed with soot combustion catalyst, optionally in combination with fuel borne additive, thereby improving the fuel consumption by keeping the pressure drop over the particulate filter low.
- An auxiliary engine can be operated at a part load, whereby the exhaust gas temperature is above 320 2 C.
- An exhaust gas temperature at filter inlet above 325 a C secures passive regeneration by continuous soot combustion and keeps the pressure drop constant low.
- Soot in the exhaust gas from the engine contains further inorganic ash that cannot combust and therefore will accumulate in the filter over time and build up the pressure drop. Consequently a further feature of the invention is the removal of ash by periodical reversing the flow direction of the exhaust gas through the filter.
- the invention provides a method for removal of soot and ash being present in exhaust gas from an engine, comprising the steps of
- the soot filter for use in the invention is typically a wall flow filter made of silicon carbide, cordierite, aluminium titanium oxide etc. on which a catalyst comprising palladium is deposited.
- the filter is prepared from silicon carbide and provided with a layer of titanium dioxide on its surface and the catalytic active material comprises oxides of vanadium, tungsten and metallic palladium as described in more detail in European Patent No. 1 493 484 Bl.
- the engine can be operated on fuel containing an additive being active in the burning off the soot.
- Additives being active in the combustion of soot captured in the particulate filter are known in the art, and include organo-metallic compounds of Cu, Ce, and Fe .
- the fuel borne catalyst further reduces the ignition temperature of the trapped soot .
- the filtration process can additionally be combined with SCR NOx removal .
- the method comprises the further step of catalytically removing nitrogen oxides from the exhaust gas prior to the gas is passed into the filter or in the alternative after the gas has passed through the filter.
- the particulate filter is placed downstream or upstream the SCR catalyst.
- the invention provides furthermore a system for removal of soot and ash being present in exhaust gas from an engine comprising
- the first, second and third exhaust gas pipe each being provided with a valve.
- Fig. 1 sche- matically shows operation of the system according to an embodiment of the invention.
- the system according to the invention may further contain a catalyst device being arranged in the first or second exhaust gas pipe, the catalyst device being active in the selective reduction of nitrogen oxides.
- Catalysts being active in the selective reduction of nitro- gen oxides and the selective reduction of nitrogen oxides are known in the art and described inter alia in the patent literature .
- a system according to the invention includes in its simplest embodiment an exhaust pipe 2 for passage of the exhaust from the engine to inlet of particulate filter 4.
- Pipe 2 is provided with a valve 6, which under normal operation is open, so that the exhaust passes to the inlet of filter 4 and soot is continuously removed for the exhaust and burned off. Cleaned exhaust gas is vented from filter 4 through pipe 8 from outlet of the filter.
- the engine exhaust gas also contains inorganic ash, which cannot be burned off the filter by passive regeneration during normal operation of the filter.
- the ash accumulates in the filter and the ash must periodically be blown off the filter by reversing the flow direction of the exhaust gas through the filter.
- valve 6 in line 2 will be closed and the exhaust gas is passed to outlet pipe 8 through pipe 10.
- valve 12 in pipe 10 is open and valve 14 in pipe 8 is closed.
- the exhaust gas is then passed from outlet to inlet of filter 4 and blows thereby accumulated ash of the filter through pipe 16.
- Pipe 16 is provided with valve 18, which is closed during normal operation of the filter, i.e. when the flow direction is not reversed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Method and system for removal of soot and ash being present in exhaust gas from an engine. The method comprises the steps of operating the engine at a load to obtain an exhaust temperature of the exhaust gas of at least 325°C; passing the exhaust gas at the exhaust temperature through a particulate filter and capturing the soot and ash in the exhaust gas in the filter; continuously burning the captured soot off the filter by contact with a catalyst being arranged on the filter; periodically reversing flow direction of the exhaust gas through the filter and blowing the captured ash off the filter.
Description
Titel: Method and system for the removal of particulate matter in engine exhaust gas
The present invention relates to a method and system for the for the removal of particulate matter in engine exhaust gas. In particular the invention is useful for the removal of soot and ash being present in the exhaust gas from auxiliary engines, which are typically installed on ships.
An essential feature of the invention is a continuously performed passive regeneration of a particulate filter being catalysed with soot combustion catalyst, optionally in combination with fuel borne additive, thereby improving the fuel consumption by keeping the pressure drop over the particulate filter low.
An auxiliary engine can be operated at a part load, whereby the exhaust gas temperature is above 3202C. An exhaust gas temperature at filter inlet above 325 aC secures passive regeneration by continuous soot combustion and keeps the pressure drop constant low.
Soot in the exhaust gas from the engine contains further inorganic ash that cannot combust and therefore will accumulate in the filter over time and build up the pressure drop. Consequently a further feature of the invention is the removal of ash by periodical reversing the flow direction of the exhaust gas through the filter.
In summary, the invention provides a method for removal of soot and ash being present in exhaust gas from an engine, comprising the steps of
operating the engine at a load to obtain an exhaust tem- perature of the exhaust gas of at least 325°C;
passing the exhaust gas at the exhaust temperature through a particulate filter and capturing the soot and ash in the exhaust gas in the filter;
continuously burning the captured soot off the filter by contact with a catalyst being arranged on the filter;
periodically reversing flow direction of the exhaust gas through the filter and blowing the captured ash off the filter. The soot filter for use in the invention is typically a wall flow filter made of silicon carbide, cordierite, aluminium titanium oxide etc. on which a catalyst comprising palladium is deposited. Preferably, the filter is prepared from silicon carbide and provided with a layer of titanium dioxide on its surface and the catalytic active material comprises oxides of vanadium, tungsten and metallic palladium as described in more detail in European Patent No. 1 493 484 Bl. Optionally, the engine can be operated on fuel containing an additive being active in the burning off the soot. Additives being active in the combustion of soot captured in the particulate filter are known in the art, and include organo-metallic compounds of Cu, Ce, and Fe . The fuel borne catalyst further reduces the ignition temperature of the trapped soot .
The filtration process can additionally be combined with SCR NOx removal .
Thus, in a further embodiment of the invention, the method comprises the further step of catalytically removing nitrogen oxides from the exhaust gas prior to the gas is passed into the filter or in the alternative after the gas has passed through the filter. Thereby, the particulate filter is placed downstream or upstream the SCR catalyst. As the engine is operated above a minimum load resulting in an exhaust gas temperature of at least 325 aC the thermal mass of the SCR unit has a negligible effect on the passive regeneration of the downstream filter.
The invention provides furthermore a system for removal of soot and ash being present in exhaust gas from an engine comprising
a first exhaust gas pipe connecting the engine with inlet of a particulate filter;
a second exhaust gas pipe connected to outlet of the particulate filter;
a third exhaust gas pipe by-passing the filter and connect- ing the first pipe with the second pipe;
the first, second and third exhaust gas pipe each being provided with a valve.
The reverse flow through the filter is controlled by auto- matic managing the valves in the exhaust pipes as described below by reference to the drawings in which Fig. 1 sche-
matically shows operation of the system according to an embodiment of the invention.
The system according to the invention may further contain a catalyst device being arranged in the first or second exhaust gas pipe, the catalyst device being active in the selective reduction of nitrogen oxides.
Catalysts being active in the selective reduction of nitro- gen oxides and the selective reduction of nitrogen oxides are known in the art and described inter alia in the patent literature .
Referring now to Fig.l, a system according to the invention includes in its simplest embodiment an exhaust pipe 2 for passage of the exhaust from the engine to inlet of particulate filter 4. Pipe 2 is provided with a valve 6, which under normal operation is open, so that the exhaust passes to the inlet of filter 4 and soot is continuously removed for the exhaust and burned off. Cleaned exhaust gas is vented from filter 4 through pipe 8 from outlet of the filter.
As already discussed hereinbefore the engine exhaust gas also contains inorganic ash, which cannot be burned off the filter by passive regeneration during normal operation of the filter. The ash accumulates in the filter and the ash must periodically be blown off the filter by reversing the flow direction of the exhaust gas through the filter. When the flow direction must be reversed, valve 6 in line 2 will be closed and the exhaust gas is passed to outlet pipe 8 through pipe 10. When the system is operated in reverse
flow mode, valve 12 in pipe 10 is open and valve 14 in pipe 8 is closed. The exhaust gas is then passed from outlet to inlet of filter 4 and blows thereby accumulated ash of the filter through pipe 16. Pipe 16 is provided with valve 18, which is closed during normal operation of the filter, i.e. when the flow direction is not reversed.
Claims
1. Method for removal of soot and ash being present in exhaust gas from an engine, comprising the steps of
operating the engine at a load to obtain an exhaust temperature of the exhaust gas of at least 325°C;
passing the exhaust gas at the exhaust temperature through a particulate filter and capturing the soot and ash in the exhaust gas in the filter;
continuously burning the captured soot off the filter by contact with a catalyst being arranged on the filter;
periodically reversing flow direction of the exhaust gas through the filter and blowing the captured ash off the filter.
2. The method of claim 1, wherein the filter is prepared from silicon carbide and provided with a layer of titanium dioxide on its surface and wherein the catalytic active material comprises oxides of vanadium, tungsten and metallic palladium.
3. The method of claim 1 or 2 , wherein the engine is operated on fuel containing an additive being active in the burning off the soot.
4. The method according to anyone of claims 1 to 3 , comprising the further steps of catalytically removing nitrogen oxides from the exhaust gas prior to the gas is passed into the filter or after the gas has passed through the filter.
5. System for removal of soot and ash being present in exhaust gas from an engine comprising
a first exhaust gas pipe connecting the engine with inlet of a particulate filter;
a second exhaust gas pipe connected to outlet of the particulate filter;
a third exhaust gas pipe by-passing the filter and connect ing the first pipe with the second pipe;
the first, second and third exhaust gas pipe each being provided with a valve.
6. The system of claim 5, further containing a catalyst device being arranged in the first or second exhaust gas pipe, the catalyst device being active in the selective re duction of nitrogen oxides.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201000890 | 2010-10-01 | ||
| DKPA201000890 | 2010-10-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012041455A1 true WO2012041455A1 (en) | 2012-04-05 |
Family
ID=44860281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2011/004709 WO2012041455A1 (en) | 2010-10-01 | 2011-09-20 | Method and system for the removal of particulate matter in engine exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012041455A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014015928A1 (en) | 2012-07-26 | 2014-01-30 | Volvo Truck Corporation | A gas flow regulating device for cleaning a particulate filter |
| WO2014169967A1 (en) * | 2013-04-15 | 2014-10-23 | Haldor Topsøe A/S | Method and system for the removal of particulate matter soot, ash and heavy metals from engine exhaust gas |
| WO2016029926A1 (en) * | 2014-08-25 | 2016-03-03 | Haldor Topsøe A/S | Method and system for the removal of particulate matter and heavy metals from engine exhaust gas |
| US9387438B2 (en) | 2014-02-14 | 2016-07-12 | Tenneco Automotive Operating Company Inc. | Modular system for reduction of sulphur oxides in exhaust |
| US9511354B2 (en) | 2013-03-15 | 2016-12-06 | General Electric Company | Method for oxidizing carbonaceous material diesel particulate filter and exhaust gas system |
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| JPS59165816A (en) * | 1983-03-09 | 1984-09-19 | Mitsubishi Motors Corp | Regenerator for diesel particulate filter |
| US5592925A (en) * | 1994-09-14 | 1997-01-14 | Ngk Insulators, Ltd. | Exhaust gas recirculation device for internal combustion engine |
| US20060191412A1 (en) * | 2005-02-28 | 2006-08-31 | Caterpillar Inc. | Filter service system and method |
| EP1493484B1 (en) | 2003-07-02 | 2007-03-07 | Haldor Topsoe A/S | Process and filter for the catalytic treatment of diesel exhaust gas |
| EP2025914A1 (en) * | 2007-07-17 | 2009-02-18 | Ifp | Method of filtering exhaust gases recirculated from an internal combustion engine and engine using such a method. |
| US20100205936A1 (en) * | 2006-01-17 | 2010-08-19 | Juji Suzuki | Exhaust gas-purifying apparatus and exhaust gas-purifying method |
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2011
- 2011-09-20 WO PCT/EP2011/004709 patent/WO2012041455A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59165816A (en) * | 1983-03-09 | 1984-09-19 | Mitsubishi Motors Corp | Regenerator for diesel particulate filter |
| US5592925A (en) * | 1994-09-14 | 1997-01-14 | Ngk Insulators, Ltd. | Exhaust gas recirculation device for internal combustion engine |
| EP1493484B1 (en) | 2003-07-02 | 2007-03-07 | Haldor Topsoe A/S | Process and filter for the catalytic treatment of diesel exhaust gas |
| US20060191412A1 (en) * | 2005-02-28 | 2006-08-31 | Caterpillar Inc. | Filter service system and method |
| US20100205936A1 (en) * | 2006-01-17 | 2010-08-19 | Juji Suzuki | Exhaust gas-purifying apparatus and exhaust gas-purifying method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015522758A (en) * | 2012-07-26 | 2015-08-06 | ボルボ トラック コーポレイション | Gas flow regulator for cleaning particulate filters |
| WO2014015928A1 (en) | 2012-07-26 | 2014-01-30 | Volvo Truck Corporation | A gas flow regulating device for cleaning a particulate filter |
| US9885269B2 (en) | 2012-07-26 | 2018-02-06 | Volvo Truck Corporation | Gas flow regulating for cleaning a particular filter |
| US9511354B2 (en) | 2013-03-15 | 2016-12-06 | General Electric Company | Method for oxidizing carbonaceous material diesel particulate filter and exhaust gas system |
| US9562451B2 (en) | 2013-04-15 | 2017-02-07 | Haldor Topsoe A/S | Method and system for the removal of particulate matter soot, ash and heavy metals from engine exhaust gas |
| WO2014169967A1 (en) * | 2013-04-15 | 2014-10-23 | Haldor Topsøe A/S | Method and system for the removal of particulate matter soot, ash and heavy metals from engine exhaust gas |
| US9387438B2 (en) | 2014-02-14 | 2016-07-12 | Tenneco Automotive Operating Company Inc. | Modular system for reduction of sulphur oxides in exhaust |
| WO2016029926A1 (en) * | 2014-08-25 | 2016-03-03 | Haldor Topsøe A/S | Method and system for the removal of particulate matter and heavy metals from engine exhaust gas |
| KR20170041726A (en) * | 2014-08-25 | 2017-04-17 | 할도르 토프쉐 에이/에스 | Method for cleaning process off- or engine exhaust gas |
| US20170216771A1 (en) * | 2014-08-25 | 2017-08-03 | Haldor Topsøes A/S | Method for cleaning process off- or engine exhaust gas |
| WO2016030025A1 (en) * | 2014-08-25 | 2016-03-03 | Haldor Topsøe A/S | Method for cleaning process off- or engine exhaust gas |
| US10286360B2 (en) | 2014-08-25 | 2019-05-14 | Haldor Topsoe A/S | Method for cleaning process off- or engine exhaust gas |
| KR102266312B1 (en) | 2014-08-25 | 2021-06-18 | 할도르 토프쉐 에이/에스 | Method for cleaning process off- or engine exhaust gas |
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