DE102012014143A1 - Gas-conducting system for combustion engine, has dry powder dispenser which is adjacent to radio sensor and is connected to flow path, in response to output signal by which extinguishing powder is output into flow path inside - Google Patents

Abstract

The system (1) has a detection device (60) having radio sensor (61) which is arranged in the flow path of system gas. The radio sensor is provided to detect the sparks (F) in flow path and to output a radio detection signal to control device (50). The control device is adapted to output an extinguishing powder output signal to the dry powder dispenser (70), in response to radio detection signal. The dry powder dispenser is adjacent to the radio sensor and is connected to flow path, in response to the output signal by which extinguishing powder (P) is output into the flow path inside.

Description

The invention relates to a gas-conducting system with a filter for purifying a system gas and an extinguishing device and an internal combustion engine equipped with such a gas-conducting system.

The extinguishing device of such a gas-conducting system serves to avoid or extinguish fires in the system and in particular in the filter. Usually, the extinguishing device works with water or inert gas as the extinguishing agent, both extinguishing agents bring some disadvantages.

In addition to water and inert gas, extinguishing powder is also generally known as extinguishing agent for avoiding and extinguishing fires, such as for example DE 10 2006 019 739 A1 is removable.

The quenching with water can cause a considerable burden and possibly even damage or destruction of the coming into contact with the water components of a gas-feeding system as mentioned above by heat shock and possibly corrosion attacks. At high temperatures of the system gas, large amounts of water may be required to extinguish, which may cause an increased weight load of the components of the gas-carrying system, and it may come to a strong steam emission by evaporating extinguishing water. The corresponding water supply usually has to be ensured by active components (eg pumps) and after the extinguishing process an active shutdown of the water supply may be necessary. A preventive use of the extinguishing device is not possible because of the risk of damage / destruction of the system components (such as filter bags of the filter).

When extinguishing with inert gas as mentioned in the introduction gas-carrying system, such. As an exhaust tract, be shut off gas-tight, which requires cost-increasing shut-off valves. In addition, a high additional design effort may be required if the operation of the system for deletion can not be stopped. When deleting with inert gas also relatively large amounts of inert gas are required. In conclusion, the quenching with inert gas is complicated and expensive and generates a high maintenance.

The invention has for its object to provide a gas-conducting system as mentioned above, in which a fire prevention and fire extinguishing without the risk of damage / destruction of the system components and in normal operation of the system is possible. The invention is also based on the object to provide an equipped with such a gas-conducting system engine.

The o. G. Objects of the invention are achieved with a gas-conducting system according to claim 1 and with an internal combustion engine according to claim 10. Further developments of the gas-conducting system according to the invention are defined in the dependent claims.

According to a first aspect of the invention, there is provided a gas-conducting system comprising: a filter for purifying a system gas passing through the gas-carrying system, a gas conduit fluidly connected to the filter so that the system gas can be supplied to the filter via the gas conduit; An erasing device having a control device and a detection device and an extinguishing powder dispensing device, which are connected to the control device, wherein a spark sensor of the detection device is arranged in a flow path of the system gas and the detection device is set up by the spark sensor detecting sparks in the flow path, a spark detection signal to output to the control means, wherein the control means is arranged to issue, in response to the spark detection signal, a discharge powder discharge signal to the discharge powder discharge means, and wherein the discharge powder discharge means is bena is connected to the spark sensor to the flow path and is adapted to output in the flow path in response to the erase powder output signal extinguishing powder inside.

By using extinguishing powder as extinguishing agent, heat shocks and corrosion attacks can be avoided and thus fire prevention and fire extinguishment can be carried out without the risk of damaging / destroying the system components. The extinguishing powder fed into the flow path accompanies a detected spark flight in the normal flow of the system gas and, depending on the application / filtration task, may possibly remain in the filter cake of the filter. Additional barriers are not required for deletion. This allows deletion during normal operation of the system and without operating restrictions.

According to one embodiment of the gas-conducting system according to the invention, the spark sensor of the detection device is arranged in the gas line and the detection device is adapted to output the spark detection signal to the control device by detecting spark in the gas line by the spark sensor, the extinguishing powder output device downstream of the spark sensor with the gas line is connected and set up in Reaction to the extinguishing powder output signal to output extinguishing powder into the gas line.

With this embodiment of the invention, a preventive extinction can already be carried out with low sparking during normal operation without operational restriction, the extinguishing powder follows the entire system gas flow and reaches the entire filter surface. Advantageously, therefore, the extinguishing system can be positioned at the very beginning of the spark gap, resulting in a significant time advantage over conventional extinguishing method.

In the case of preventive extinguishing, the injection point of the extinguishing powder thus lies at the first detection point for flying sparks, so that the extinguishing agent "accompanies" the ignition source on the filter even before the actual ignition.

According to a further embodiment of the gas-conducting system according to the invention, the extinguishing device has at least one further extinguishing powder dispensing device connected to the control device, wherein at least one further spark sensor of the detection device is arranged in the filter and the detection device is set up, in which spark is detected by the further spark sensor outputting to the filter a spark detection signal to the control means, the control means being arranged to output a dry powder discharge signal to the further dry powder discharge means in response to the spark detection signal based on the detection by the further spark sensor, and wherein the further dry powder discharge means is adjacent to the other one Spark sensor is connected to the filter and is adapted to issue in response to the erosion powder output signal supplied thereto extinguishing powder into the filter.

With this embodiment of the invention, a so-called object deletion by means of an additional extinguishing system directly on the object (filter) triggered by one or more local sensor (s) can be realized.

According to yet another embodiment of the gas-conducting system according to the invention, the further spark sensor of the detection device is arranged in the filter at a position at which a concentration of particles deposited from the system gas is to be expected.

With this embodiment of the invention, an emergency or reserve deletion can be realized analogously to the object deletion, but if necessary, optimized for specific design features (such as, for example, formation of dust deposits).

According to yet another embodiment of the gas-conducting system according to the invention, the detection device is set up to integrate information about a spark amount into the spark detection signal, wherein the control device is set up to generate the dry powder output signal as a function of the spark level. The spark extent preferably has a spark density and / or a spark flight duration.

Thus, an extinguishing intensity in direct dependence on the degree of detection / duration or the amount of spark can be controlled.

The control device is preferably set up to generate the erasure powder output signal as a signal pulsed in an erasure period as a function of the extent of the spark, so that a pulsed erosion powder output varies in a pulse frequency and / or pulse length depending on the pulsed signal.

Alternatively or additionally, the control device is set up to generate the erasure powder output signal as a signal which is continuous in an erasure period and has a spark level-dependent signal strength, so that a continuous erase powder output varies in an output quantity per unit time depending on the signal strength.

As a result, the extinguishing powder addition can be controlled in a batchwise manner or as a permanent addition, depending on the degree of detection or the extent of the spark. An intermittent addition of extinguishing powder is preferably carried out during preventive extinguishing, whereas a permanent addition preferably takes place during object extinction and during emergency or reserve extinguishment in the form of a specific permanent extinction (complete firing).

According to a further embodiment of the gas-conducting system according to the invention, the gas line is designed as an exhaust pipe for a combustion process and the filter is designed as an exhaust gas purification filter, in particular as a particle filter.

According to a second aspect of the invention, an internal combustion engine is provided with a gas-carrying system according to one, several or all previously described embodiments of the invention in any conceivable combination, wherein the gas line of the gas-conducting system is connected to an exhaust gas outlet of the internal combustion engine.

The invention expressly extends to such embodiments, which are not by feature combinations of explicit Back references of the claims are given, with which the disclosed features of the invention - as far as is technically feasible - can be combined with each other.

In the following the invention will be described in more detail by means of a preferred embodiment and with reference to the attached figures.

1 shows a schematic view of a gas-conducting system of an internal combustion engine according to an embodiment of the invention in a first operating function.

2 shows a schematic view of the gas-carrying system of 1 in a second operating function.

The following is with reference to the 1 and 2 one with a gas-carrying system 1 equipped internal combustion engine (not fully shown) according to an embodiment of the invention will be described.

As in 1 and 2 shown, the gas-leading system 1 a filter 10 for purifying a system gas G, a first gas line 20 , a second gas line 30 and an extinguishing device 40 on.

The first and the second gas line 20 . 30 are each formed as an exhaust pipe for a combustion process, wherein the filter 10 is designed as an exhaust gas purification filter, in particular as a particle filter, and wherein the first gas line 20 to an exhaust outlet (not shown) of the internal combustion engine is connected. Accordingly, the system gas is formed as exhaust gas of the internal combustion engine.

The internal combustion engine can be designed according to the invention as a reciprocating engine, in particular as a diesel engine or as a gas engine, or as a turbomachine, in particular as a gas turbine.

The first gas line 20 is with the filter 10 fluidly connected, so that the system gas G the filter 10 over the first gas line 20 can be fed.

The second gas line 30 is also with the filter 10 fluidly connected, so that over the filter 10 filtered system gas G via the second gas line 30 from the filter 10 is deductible.

The extinguishing device 40 has a control device 50 and a detection device 60 which is signal-connected to the controller, and two dry powder dispensers 70 . 80 on, which are also signal connected to the controller.

The detection device 60 has two z. B. optoelectronic spark sensors 61 . 62 in each case in a flow path of the system gas G through the gas-conducting system 1 are arranged. Each of the extinguishing powder dispensers 70 and 80 is adjacent to one of the spark sensors 61 respectively. 71 arranged connected to the flow path.

The detection device 60 is set up so that when through one of the spark sensors 61 . 62 Spark F (see 1 ) are detected in the flow path, a spark detection signal to the controller 50 outputs.

The control device 50 in turn, is arranged to send, in response to the spark detection signal, a dry powder output signal to the spark sensor triggering the spark detection signal 61 . 62 associated extinguishing powder dispenser 70 . 80 outputs.

The dry powder dispensers 70 . 80 are each arranged to output quenching powder P into the flow path in response to the quenching powder discharge signal.

The powder cloud generated in the flow path by means of the quenching powder P has a stiffening effect and an inhibiting effect, resulting in a sudden extinguishing effect. The formation of enamel layers can prevent the supply of oxygen and the heating of the immediate fire environment and prevent re-ignitions. Dry powder can z. B. from non-toxic, inorganic salts, which are mixed with water repellents and flow aids exist.

How out 1 recognizable, is the first spark sensor 61 the detection device 60 in the first gas line 20 arranged. Accordingly, the detection device 60 set, the spark detection signal at by the first spark sensor 61 Detecting sparks F in the first gas line 20 to the controller 50 issue. The first dry powder dispenser 70 is accordingly downstream downstream adjacent to the first spark sensor 61 with the first gas line 20 connected and is arranged, in response to the extinguishing powder output signal extinguishing powder P in the first gas line 20 spend in it.

How out 2 recognizable, is the second spark sensor 62 the detection device 60 in the filter 10 arranged. Accordingly, the detection device 60 set up by the second spark sensor 62 Detecting sparks F in the filter 10 a spark detection signal to the controller 50 issue. The second dry powder dispenser 80 is accordingly adjacent to the second spark sensor 62 with the filter 10 and is set up in response to the erase powder output signal supplied thereto with quenching powder P in the filter 10 spend in it.

The second spark sensor 62 the detection device 10 is in the filter 10 preferably arranged at a position at which a concentration of deposited from the system gas G particles such. B. dust nests, is to be expected. According to the invention, several second spark sensors can also be used 62 at different positions in the filter 10 can be arranged and can several second dry powder dispensing devices 80 to the filter 10 be connected so that they on receipt of a corresponding erase powder output signal selectively extinguishing powder P to the respectively associated second spark sensor 62 belonging position in the filter 10 can spend.

According to the invention, the detection device 60 Preferably configured to integrate information about a spark level in the spark detection signal, wherein the control means 50 is arranged to generate the erasure powder output signal in dependence on the amount of spark.

The amount of spark preferably has a spark density and / or a duration of the existence of spark flight (a spark flight duration).

The control device 50 Accordingly, it is preferably arranged to generate the erasure powder output signal as a signal pulsed in an erasure period as a function of the extent of the spark, so that a pulsed output of eradicant powder P varies in a pulse frequency and / or pulse length depending on the pulsed signal.

Alternatively or additionally, the control device 50 is arranged to generate the erasure powder output signal as a signal continuous in a erasure period with a signal magnitude dependent on the amount of spark, so that a continuous output of erasing powder P varies in an output quantity per unit time depending on the signal strength.

The extinguisher P working extinguishing device 40 the gas-carrying system according to the invention 1 can in contrast to working with water or inert gas conventional extinguishing the extinguishing powder P in normal operation of the gas-conducting system 1 and thus blow in the normal operation of the internal combustion engine according to the invention.

The extinguishing device 40 divided into the two in 1 and 2 shown functional systems or operating functions.

Preventive erasure may be preferred with in 1 shown operating function by means of the first extinguishing powder dispensing device 70 and the first spark sensor 61 be carried out, wherein the Einblasstelle the extinguishing powder P is at the first detection point for flying sparks and the extinguishing powder P (extinguishing agent) the ignition source or the spark or before the actual ignition on the filter 10 "Accompanied". The extinguishing powder P thus follows the entire system gas flow (here, for example, the exhaust gas flow) and reaches the entire filter surface. Preventive extinguishing is possible during normal operation without any operational restrictions and can be used preventively even with low sparking. The fact that the deletion is initiated at the very beginning of the spark gap, there is a considerable time advantage over conventional extinguishing method

An object deletion may be preferred with the in 2 shown operating function by means of the second extinguishing powder dispensing device 80 and the second spark sensor 62 be carried out, being directly on the object (here the filter 10 ) triggered by local sensors (here the second spark sensor or sensors) 62 ) by means of the second extinguishing powder dispenser 80 Erased extinguishing powder P and a deletion is effected. An emergency or reserve deletion can be similar to object deletion, but possibly optimized to specific constructive characteristics, such. B. in places with dust formation, carried out.

In accordance with the above-described possibility of generating the erasure powder output signal as a pulsed or continuous signal in an erasure period, the erasable powder addition may be controlled in a controlled manner or as a permanent addition, depending on the degree of detection or the amount of spark. An intermittent addition of extinguishing powder is preferably carried out during preventive extinguishing, whereas a permanent addition preferably takes place during object extinction and during emergency or reserve extinguishment in the form of a specific permanent extinction (complete firing).

For each of the above deletion variants is a shutdown of the system 1 or the internal combustion engine usually not required and normal operation can be maintained. The extinguishing powder P may after deletion if necessary in the filter cake in the filter 10 remain until the filter 10 subject to normal maintenance, filter cleaning or replacement.

LIST OF REFERENCE NUMBERS

1

gas-carrying system

10

filter

20

gas pipe

30

gas pipe

40

extinguishing device

50

control device

60

detection device

61

wireless sensor

62

wireless sensor

70

Dry powder dispenser

80

Dry powder dispenser

F

spark

G

system gas

P

Dry powder

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006019739 A1 [0003]

Claims (10)

Gas-conducting system ( 1 ), comprising: a filter ( 10 ) for cleaning a system gas (G), a gas line ( 20 ), with the filter ( 10 ) is fluidly connected, so that the system gas (G) the filter ( 10 ) via the gas line ( 20 ), and an extinguishing device ( 40 ) with a control device ( 50 ) as well as a detection device ( 60 ) and a dry powder dispenser ( 70 . 80 ) connected to the control device ( 50 ), wherein a spark sensor ( 61 . 62 ) of the detection device ( 60 ) is arranged in a flow path of the system gas (G) and the detection device ( 60 ) is set up by the spark sensor ( 61 . 62 ) Detecting sparks (F) in the flow path, a spark detection signal to the control device ( 50 ), the control device ( 50 ) is arranged in response to the spark detection signal, a erase powder output signal to the extinguishing powder output device ( 70 . 80 ), and wherein the extinguishing powder dispenser ( 70 . 80 ) adjacent to the spark sensor ( 61 . 62 ) is connected to the flow path and configured to discharge the dry powder (P) into the flow path in response to the purge powder output signal. Gas-conducting system ( 1 ) according to claim 1, wherein the spark sensor ( 61 ) of the detection device ( 60 ) in the gas line ( 20 ) and the detection device ( 60 ), the spark detection signal is applied by the spark sensor ( 61 ) Detecting sparks (F) in the gas line ( 20 ) to the control device ( 50 ), and wherein the extinguishing powder dispenser ( 70 ) downstream of the spark sensor ( 61 ) with the gas line ( 20 ) and is arranged, in response to the extinguishing powder output signal extinguishing powder (P) in the gas line ( 20 ). Gas-conducting system ( 1 ) according to claim 2, wherein the extinguishing device ( 40 ) at least one with the control device ( 50 ) further extinguishing powder output device ( 80 ), wherein at least one further spark sensor ( 62 ) of the detection device ( 60 ) in the filter ( 10 ) and the detection device ( 60 ) is set up by the further spark sensor ( 62 ) Detecting Sparks (F) in the Filter ( 10 ) a spark detection signal to the control device ( 50 ), the control device ( 50 ) in response to the detection by the further spark sensor ( 62 ) based spark detection signal, a erase powder output signal to the further extinguishing powder output device ( 80 ), and wherein the further extinguishing powder dispensing device ( 80 ) in the vicinity of the further spark sensor ( 62 ) with the filter ( 10 ) and is set up, in response to the erasure powder output signal supplied thereto, to dispose extinguishing powder (P) into the filter ( 10 ). Gas-conducting system ( 1 ) according to claim 3, wherein the further spark sensor ( 62 ) of the detection device ( 60 ) in the filter ( 10 ) is located at a position where a concentration of deposited particles is expected. Gas-conducting system ( 1 ) according to one of claims 1 to 4, wherein the detection device ( 60 ) is arranged to integrate information about a spark amount into the spark detection signal, and wherein the control device ( 50 ) is arranged to generate the erasure powder output signal in dependence on the spark amount. Gas-conducting system ( 1 ) according to claim 5, wherein the spark amount has a spark density and / or a spark duration. Gas-conducting system ( 1 ) according to claim 5 or 6, wherein the control device ( 50 ) is arranged to generate the erasure powder output signal as a pulsed signal in an erasure period in response to the amount of spark, so that pulsed eradicant powder output varies in pulse frequency and / or pulse length depending on the pulsed signal. Gas-conducting system ( 1 ) according to one of claims 5 to 7, wherein the control device ( 50 ) is arranged to generate the erasure powder output signal as a continuous signal in a erasure period with a spark level dependent signal strength, so that a continuous erase powder output varying in an output amount per unit time depending on the signal strength is provided. Gas-conducting system ( 1 ) according to one of claims 1 to 8, wherein the gas line ( 20 ) is designed as an exhaust pipe for a combustion process and the filter ( 10 ) is designed as an exhaust gas purification filter, in particular as a particle filter. Internal combustion engine with a gas-carrying system ( 1 ) according to claim 9, wherein the gas line ( 20 ) is connected to an exhaust gas outlet of the internal combustion engine.

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