• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Exhaust gas recirculation system (10) for returning exhaust gases from a single exhaust line (9) of an internal combustion engine (1), in particular a large combustion engine with an engine power of 500 kW or more, permissible air intake (3) thereof, which system comprises: two or more particulate filters (12a , 12b) arranged parallel to each other; valve means (17) for selectively switching the respective filter between an active state and an inactive state, the valve means being arranged to allow exhaust gases to pass from the exhaust line to the air intake via a filter which is in that active state and to prevent exhaust gases from passing from the exhaust line to the air intake via a filter which is in the inactive state; and filter regenerating means (40) for selectively initiating single regeneration of the respective filter when the filter is in the inactivated state. (Fig. 1)
    公开号:SE1250004A1
    申请号:SE1250004
    申请日:2009-06-11
    公开日:2012-01-05
    发明作者:Micael Blomquist
    申请人:Stt Emtec Ab；
    IPC主号:
    专利说明:

    Is required for the operation of the SCR catalyst. The EGR technology is less efficient than the SCR catalyst technology and has so far not been used for large internal combustion engines with an engine power of 500 kW or more.
    SUMMARY OF THE INVENTION The object of the present invention is to provide an advantageous solution for purifying the exhaust gases from an internal combustion engine, in particular from a large internal combustion engine with an engine power of 500 kW or more.
    According to the invention, this object is achieved by means of an exhaust gas recirculation system having the features defined in claim 1.
    The exhaust gas recirculation system according to the invention is to be used for returning exhaust gases from an exhaust line of an internal combustion engine to an air intake thereof, and comprises: a filter arrangement for removing particulate constituents from exhaust gases passing through the return system from the exhaust line to the engine air intake, wherein the filter arrangement comprises two or more particulate filters arranged in parallel with each other; valve means for selectively switching the respective filter between an active state and an inactive state, the valve means being arranged to allow exhaust gases to pass from the exhaust line to the engine air intake via a filter which is in the active state and to prevent exhaust gases from passing from the exhaust line to the engine air intake via a filter that is in the inactive state; and - filter regenerating means for selectively initiating a regeneration of the respective filter when the filter is in the inactive state. By allowing the particulate filters to be arranged in the exhaust gas recirculation system and not in the ordinary exhaust line from the engine, it becomes possible to use particulate filters of reduced size. When the exhaust gas recirculation system according to the invention is used to purify the exhaust gases from a large internal combustion engine with an engine power of 500 kW or more, it becomes possible to use particulate filters of the type and dimension currently used in exhaust lines from diesel engines in road vehicles. This is due to the fact that the returned exhaust gas flow in an exhaust gas recirculation system of a large internal combustion engine with an engine power of 500 kW or more is usually approximately the same size as the exhaust gas flow in the exhaust line from a conventional diesel engine in a road vehicle. Thus, standard particle filters can be used, which contributes to relatively low installation and maintenance costs and reduced space requirements. By using two or more parallel particle filters, one filter can also be regenerated while one or more other filters are in operation. In this way, a filter can be regenerated at the same time as the return system continues to function in the normal way.
    Additional advantages as well as advantageous features of the invention appear from the following description and the dependent claims.
    BRIEF DESCRIPTION OF THE DRAWING With reference to the accompanying drawing, the following is a more detailed description of preferred embodiments of the invention given by way of example. In the drawing: Fig. 1 is a schematic top plan view of an internal combustion engine provided with an exhaust gas recirculation system according to an embodiment of the present invention. 10 15 20 25 30 35 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION An internal combustion engine 1 is illustrated in Fig. 1. In the illustrated example, the internal combustion engine 1 is a large diesel engine, but it could alternatively be a large gas engine. In the illustrated example, the output shaft of the motor 1 is connected to a generator 2, which is driven by the motor to generate electric power.
    The engine 1 is provided with an air intake 3, via which combustion air is supplied to the engine. In the illustrated example, the air intake 3 comprises two air inlet ducts 4a, 4b, each of which is provided with an air filter 5a, 5b.
    In the illustrated example, the engine 1 is provided with turbochargers 6a, 6b to effect supercharging, i.e. forced air supply to the engine. A first turbocharger 6a comprises a compressor wheel 7a arranged in a first 4a of the air inlet ducts, and a second turbocharger 6b comprises a compressor wheel 7b arranged in the second air inlet duct 4b. Respective compressor wheels 7a, 7b are driven by an associated turbine wheel 8a, 8b, which is arranged to be set in rotation of exhaust gases from the engine 1. The compressor wheel 7a, 7b and the turbine wheel 8a, 8b of the respective turbochargers 6a, 6b are operatively connected to each other, t. ex. by being placed on one and the same axis. As an alternative, the flow of air into the engine 1 via the air inlet ducts 4a, 4b can be effected without any turbochargers, i.e. only by suction caused by piston movements in the engine.
    An exhaust line 9 is connected to the engine 1. The exhaust gases produced by the engine 1 are led through the exhaust line 9 and the main part thereof exits into the surroundings via an exhaust outlet (not shown) which is connected to the exhaust line. An exhaust gas recirculation system 10 is provided for returning exhaust gases from the exhaust line 9 to the air intake 3. The recirculation system 10 comprises a filter arrangement 11 for removing particulate constituents from exhaust gases passing through the recirculation system from the exhaust line 9 to the air intake 3. In the illustrated example, the filter arrangement 11 comprises a first particle filter 12a and a second particle filter 12b arranged parallel to each other in the return system 10.
    However, the filter arrangement may, if desired, comprise more than two particulate filters arranged in parallel with each other in the return system. Respective filters 12a, 12b have such a filtration ability that they are able to capture particulate constituents to such an extent that the exhaust gases after passing through the filter are sufficiently filtered to be able to be returned to the engine air intake 3 and introduced into the engine 1 without cause damage to the engine. The filters 12a, 12b constitute the so-called diesel particulate filter. The return system 10 comprises an inlet 13 for receiving exhaust gases from the exhaust line 9. The inlet 13 comprises a catchment pipe 14 which is arranged in the exhaust line 9 with its inlet opening 15 directed towards the intended flow direction of exhaust gases flowing through the exhaust line. The exhaust gases flowing into the return system via the inlet 13 are led via a line 16 towards the filters 12a, 12b. The return system 10 comprises valve means 17 for selectively switching the respective filters 12a, 12b between an active state and an inactive state. The valve means 17 are arranged to allow exhaust gases to pass from the exhaust line 9 to the air intake 3 via a filter which is in the active state and to prevent exhaust gases from passing from the exhaust line 9 to the air intake 3 via a filter which is in the inactive state. The valve means 17 are preferably arranged to switch one of said filters 12a, 12b from active to inactive state at the same time as they switch the other of said filters from inactive to active state.
    In the illustrated example, said valve means 17 comprises a valve device 18 arranged in the line 16 between the inlet 13 and the filters 12a, 12b to direct the exhaust gas flow in the line 16 to one of the filters 12a, 12b while it prevents the exhaust gas flow in line 16 from reaching the second filter. The valve device 18 is thus arranged to connect one filter at a time to the inlet 13 while disconnecting the second filter from the inlet 13. The return system 10 comprises two first outlets 19a, 19b which are connected to the air intake 3 of the engine 1 for discharging again. exhaust gases to the air intake. A 19a of said first outlet is connected to the first air inlet duct 4a and the second 19b of said first outlet is connected to the second air inlet duct 4b. The return system 10 also comprises a second outlet 20 which is connected to the exhaust line 9 downstream of the inlet 13 for discharging to the exhaust line of combustion gases formed during the regeneration of the respective filters 12a, 12b. In the illustrated example, a valve device 21a, 21b is arranged downstream of respective filters 12a, 12b to selectively connect the outlet 22a, 22b of the filter to the first outlets 19a, 19b of the return system or to the second outlet 20 of the return system. . The return system 10 includes filter regenerating means 40 for selectively initiating a regeneration of respective filters 12a, 12b when the filter is in the inactive state. In the illustrated example, the filter regenerating means 40 comprise heating devices 41a, 41b connected to each of the filters 12a, 12b for generating heat to the filter for initiating a regeneration thereof, and an air blowing device 42 for blowing air through the respective heating device 41a , 41b and into the filter 12a, 12b which is connected to the heating device when a regeneration of the filter is to be initiated. The air blower 42 includes a fan 43, the speed of which is controlled by an electric motor 44 to thereby control the temperature of the hot air flowing into a filter 12a, 12b from the heating device 41a, 41b connected to the filter when a regeneration of the filter must be initiated. A valve device 45 is provided between the fan 43 and the heating devices 41a, 41b to direct the air flow from the air blowing device 42 to one of the heating devices 41a, 41b while preventing the air flow from the air blowing device 42 from reaching the second heating device. The valve device 45 is thus capable of connecting one heating device 41a, 41b at a time to the air blowing device 42 while disconnecting the second heating device from the air blowing device.
    Respective filters 12a, 12b comprise a first inlet 23a, 23b for receiving exhaust gases from the exhaust line 9 and a second inlet 24a, 24b for receiving air from the air blowing device 42. Respective heating device 41a, 41b is connected to the second inlet 24a, 24b of the filter 12a, 12b to which it belongs. A shut-off valve 46a, 46b is arranged between the respective heating device 41a, 41b and the second inlet 24a, 24b of the associated filter 12a, 12b. This shut-off valve is open when the associated filter is regenerated. The shut-off valve 46a, 46b is otherwise closed to prevent unfiltered exhaust gases from flowing into the heating device 41a, 41b during the periods between the regeneration operations.
    A cooler 25 is arranged between the filters 12a, 12b and the engine air intake 3 to cool the returned exhaust gases. In the illustrated example, the radiator 25 is connected by lines 26 to the cooling system of the engine 1 to be supplied with cooling water from this cooling system. A condensate trap 27 is arranged directly downstream of the cooler 25.
    A valve device 28 is arranged in the return system 10 between the filters 12a, 12b and the engine air intake 3, and the return system comprises an electronic control device 29 for controlling the valve device 28 to thereby control the amount of exhaust gases returned to the engine 1. This valve device 28 constitutes a so-called EGR valve. A flow meter 30 is provided for measuring the amount of exhaust gases passing through the return system 10. The control device 29 is connected to this flow meter 30 to receive information therefrom regarding the amount of exhaust gases currently present. returned to the engine.
    In the illustrated example, secondary filters 31a, 31b are arranged between the valve device 28 and the first outlets 19a, 19b of the return system. A first secondary filter 31a is arranged upstream of a 19a of said first outlet and a second secondary filter 31b is arranged upstream of the second 19b of these outlets. The secondary filters 31a, 31b have a filtration capacity which is lower than the filtration capacity of the particulate filters 12a, 12b and are intended to protect the engine 1 from being damaged by larger particles should the particulate filters 12a, 12b or any other components of the return system 10 be affected. of error.
    Shut-off valves 32, 33 are provided at the inlet 13 and the second outlet 20 of the return system 10 to enable the return system to be disconnected from the exhaust line 9.
    The valve devices 18, 21a, 21b, the shut-off valves 32, 33, 46a, 46b, the heating devices 41a, 41b, the valve device 45 and the electric motor 44 of the air blowing device are controlled by the control device 29 or by some other electronic control device.
    When the return system 10 is in operation, one of the filters, for example the first filter 12a, is in the active state and consequently connected to the inlet 13 of the return system for receiving exhaust gases from the exhaust line 9, while the second filter 12b is in the inactive state. the condition and consequently disconnected from the inlet 13.
    The outlet 22a of the active first filter 12a is connected to the air inlet 3 of the engine 1 and disconnected from the second outlet 20 of the return system, while the outlet 22b of the inactive second filter 12b is disconnected from the air inlet 3 and connected to the second outlet 20. When the active first filter 12a has collected a given amount of particles or when a given period of time has elapsed after this filter has been set in the active state, the valve device 18 disconnects this filter 12a from the inlet 13 and connects in place the second filter 12b to the inlet 13 to thereby switch the first filter 12a from the active to inactive state and the second filter 12b from inactive to active state.
    At the same time, the valve device 21a disconnects the outlet 22a of the first filter 12a from the air intake 3 and instead connects this outlet 22a to the second outlet 20 of the return system, while valve device 21b disconnects the outlet 22b of the second filter 12b from the second outlet 20 of the return system and instead connects this outlet 22a to the air intake 3. Thereafter, the shut-off valve 46a and the electric motor 44 of the air blower 42 are opened and the heating device 41a is switched on to thereby initiate a regeneration of the now inactive first filter 12a. The heating device 41a heats the air flow from the air blowing device 42 and the heated air is led into the filter 12a to raise the temperature therein to such a level that combustion of the particles accumulated in the filter takes place. This regenerates the inactive filter 12a. The combustion gases formed during the regeneration of the inert filter 12a are discharged to the exhaust line 9 via the second outlet 20 of the return system. When the regeneration of the inactive filter 12a has been completed, for example when a given period of time has elapsed after the start of the regeneration process, the electric motor 44 of the air blower 42 and the heating device 41a are switched off and the shut-off valve 46a is closed. When the now active second filter 12b has collected a given amount of particles or when a given period of time has elapsed after this filter has been put into the active state, the valve device 18 disconnects this filter 12b from the inlet 13 and instead connects the first filter 12a to the inlet 13 to thereby switch the second filter 12b from active to inactive state and the first filter 12a from inactive to active state. At the same time, the valve device 21b disconnects the outlet 22b of the second filter 12b from the air intake 3 and instead connects this outlet 22b to the second outlet 20 of the return system, while the valve device 21a disconnects the outlet 22a of the first filter 12a from the second outlet 20 of the return system and instead then connects this outlet 22b to the air inlet 3. Thereafter, the shut-off valve 46b and the electric motor 44 of the air blower 42 are opened and the heater 41b is turned on to thereby initiate a regeneration of the now inactive second filter 12b. The combustion gases formed during the regeneration of the inert filter 12b are discharged to the exhaust line 9 via the second outlet 20 of the return system. When the regeneration of the inactive filter 12b has been completed, the electric motor 44 of the air blower and the heating device 41b are turned off and the shut-off valve 46b is closed.
    The above-mentioned sequence of functions is repeated as long as the motor 1 is in operation.
    The amount of particles accumulated in the active filter can be determined, for example, by measuring the pressure drop across the filter and the volume flow through the filter.
    The exhaust gas recirculation system of the present invention is particularly intended for use with a large internal combustion engine with an engine power of 500 kW or more. Such an internal combustion engine may, for example, be connected to a generator for generating electric power in a train or ship or at a power station.
    The invention is of course not in any way limited to the embodiments described above, but a number of possibilities for modifications thereof should be obvious to a person skilled in the art, without this departing from the basic idea of the invention as defined in the appended claims.
    权利要求:
    Claims (12)
    [1]
    Claims 1
    [2]
    Exhaust gas recirculation system for returning exhaust gases from an exhaust line of an internal combustion engine, in particular a large internal combustion engine with an engine power of 500 kW or more, to an air intake thereof, characterized in that it comprises: - a filter arrangement ( 11) for removing particulate constituents from exhaust gases passing through the return system (10) from the exhaust line to the engine air intake, the filter arrangement comprising two or more particulate filters (12a, 12b) arranged in parallel with each other; valve means (17) for selectively switching the respective filters (12a, 12b) between an active state and an inactive state, the valve means (17) being arranged to allow exhaust gases to pass from the exhaust line to the engine air intake via a filter which is in the active state and prevents exhaust gases from passing from the exhaust line to the engine air intake via a filter that is in the inactive state; and - filter regenerating means (40) for selectively initiating a regeneration of respective filters (12a, 12b) when the filter is in the inactive state.
    [3]
    Exhaust gas recirculation system according to claim 1, characterized in that the filter regenerating means (40) comprise heating devices (41a, 41b) connected to each of said filters (12a, 12b) for generating heat to the filter for initiating a regeneration hence.
    [4]
    Exhaust gas recirculation system according to claim 2, characterized in that the filter regenerating means (40) comprise an air blowing device (42) for blowing air through the respective heating device (41a, 41b) and into the filter (12a, 12b) connected to the heating device when a regeneration of the filter is to be initiated. 10 15 20 25 30 35 12
    [5]
    Exhaust gas recirculation system according to claim 3, characterized in that the air blowing device (42) comprises a fan (43), the speed of which is controlled by an electric motor (44) to thereby regulate the temperature of the hot air flowing into a filter (12a, 12b) from the associated heating device (41a, 41b) when a regeneration of the filter is to be initiated.
    [6]
    Exhaust gas recirculation system according to claim 3 or 4, characterized in that the respective filter (12a, 12b) comprises a first inlet (23a, 23b) for receiving exhaust gases from the exhaust line (9) and a second inlet (24a, 24b ) for receiving air from the air blowing device (42), the respective heating device (41a, 41b) being connected to the second inlet (24a, 24b) of the filter to which it belongs.
    [7]
    Exhaust gas recirculation system according to one of Claims 1 to 5, characterized in that a cooler (25) is arranged between the filters (12a, 12b) and the engine air intake for cooling the recirculated exhaust gases.
    [8]
    Exhaust gas recirculation system according to Claim 6, characterized in that a condensate trap (27) is arranged between the radiator (25) and the engine air intake.
    [9]
    Exhaust gas recirculation system according to any one of claims 1-7, characterized in that it comprises: - an inlet (13) for receiving exhaust gases from the engine exhaust line; - one or more first outlets (19a, 19b) connected to the engine air intake for the discharge of returned exhaust gases to the air intake; and - one or more other outlets (20) connected to the engine exhaust line downstream of the inlet (13) for discharge to the exhaust line of combustion gases formed during the regeneration of the respective filters (12a, 12b). 10 15 20 25
    [10]
    10.
    [11]
    11.
    [12]
    Exhaust gas recirculation system according to claim 8, characterized in that the inlet (13) of the recirculation system (10) comprises a collecting pipe (14) arranged in the engine exhaust line with its inlet opening (15) directed towards the intended flow direction of exhaust gases flowing through the exhaust line. Exhaust gas recirculation system according to claim 8 or 9, characterized in that a valve device (21a, 21b) is arranged downstream of the respective filter (12a, 12b) for selectively connecting the outlet (22a, 22b) of the filter to at least one of said one or more first outlets (19a, 19b) of the return system or with at least one of said one or more second outlets (20) of the return system. Exhaust gas recirculation system according to one of Claims 1 to 10, characterized in that it comprises a valve device (28) arranged between the filters (12a, 12b) and the engine air intake, and an electronic control device (29) for controlling the valve device ( 28) to thereby regulate the amount of exhaust gases returned to the engine. Exhaust gas recirculation system according to any one of claims 1-11, characterized in that said valve means (17) are arranged to switch at least one of said filters (12a, 12b) from active to inactive state at the same time as they switch at least one other of said filters (12a, 12b) from inactive to active state.
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    同族专利:
    公开号 | 公开日
    KR20140069380A|2014-06-10|
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    法律状态:
    2017-01-31| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/SE2009/050713|WO2010144006A1|2009-06-11|2009-06-11|Exhaust gas recirculation system|
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