KR101526102B1 - Internal combustion engine having pyrolysis gas generating cylinder and exhaust gas purifying system - Google Patents

Internal combustion engine having pyrolysis gas generating cylinder and exhaust gas purifying system Download PDF

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Publication number
KR101526102B1
KR101526102B1 KR1020140003193A KR20140003193A KR101526102B1 KR 101526102 B1 KR101526102 B1 KR 101526102B1 KR 1020140003193 A KR1020140003193 A KR 1020140003193A KR 20140003193 A KR20140003193 A KR 20140003193A KR 101526102 B1 KR101526102 B1 KR 101526102B1
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South Korea
Prior art keywords
pyrolysis gas
main
cylinder
pyrolysis
exhaust gas
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KR1020140003193A
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Korean (ko)
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이춘범
오광철
김덕진
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자동차부품연구원
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    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system according to an embodiment of the present invention burns hydrocarbon fuel to generate mechanical power And a pyrolysis gas generating cylinder for generating a pyrolysis gas by thermally decomposing the hydrocarbon-based fuel at a rich air-fuel ratio, and a pyrolysis gas generating cylinder for generating nitrogen oxides contained in the exhaust gas discharged from the main cylinder of the engine body, And a nitrogen oxide removal device (Lean NOx trap, LNT) that reduces the amount of decomposition by using pyrolysis gas discharged from the cylinder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system,

The present invention relates to an internal combustion engine having a pyrolytic gas generating cylinder and an exhaust gas purifying system, and more particularly to a pyrolytic gas generating cylinder for pyrolyzing a fuel and an internal combustion engine having an exhaust gas purifying system capable of efficiently reducing nitrogen oxides .

Converted into the carbon monoxide (CO), harmful substances discharged from the engine, a hydrocarbon (HC), and nitrogen oxides (NOx) carbon dioxide (CO 2) to harmless substances such as water (H 2 O), and nitrogen (N 2), etc. An exhaust gas purifying system using a three-way catalyst is generally used.

The three way catalyst is a catalytic converter using platinum, palladium, rhodium, etc., which combines oxidation and reduction. Nitrogen oxides (NOx) act as an oxidizing agent for carbon monoxide (CO) and hydrocarbons (HC) in the three-way catalyst, while keeping the mixing ratio at the stoichiometric air-fuel ratio so that oxygen is not left in the exhaust gas and the exhaust temperature is maintained at a sufficiently high temperature. (CO) and hydrocarbons (HC) can act as reducing agents for nitrogen oxides (NOx) to simultaneously reduce carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx).

On the other hand, in order for the three-way catalyst to fully exhibit its capability, the mixture ratio of air and fuel should always be kept close to the stoichiometric air-fuel ratio. When the air-fuel ratio becomes lean, the reduction rate of nitrogen oxides (NOx), that is, the reduction ratio of nitrogen oxides (NOx), becomes low.

Currently, gasoline direct injection (GDI) engines and compression ignition diesel engines among various types of engines are attracting attention because they can achieve relatively high fuel efficiency.

The gasoline direct injection engine and the diesel engine have a common fuel consumption ratio when they are burned at a lean air-fuel ratio. However, it is difficult to sufficiently reduce nitrogen oxides (NOx) by using a three-way catalyst under the condition of operating at a lean air-fuel ratio. Therefore, gasoline direct injection engines and diesel engines additionally use a selective catalytic reduction (SCR) reactor or a nitrogen oxide removal apparatus (Lean NOx Trap, LNT) in order to reduce nitrogen oxides.

The nitrogen oxide removal equipment (LNT) stores nitrogen oxides (NOx) in a wash coat during operation with a lean air-fuel ratio, operates at a rich air-fuel ratio for a short period of time, (NOx) is reduced to nitrogen which is harmless to the human body.

Therefore, conventionally, the lean air-fuel ratio operation and the rich air-fuel ratio operation have to be repeated periodically in order to use the nitrogen oxide removal device (LNT), so there is a problem that the fuel is wasted and the quietness of operation is lowered.

In addition, the selective catalytic reduction reactor requires urea to produce ammonia which is a reducing agent.

Therefore, conventionally, in order to use the selective catalytic reduction reactor, a separate urea water supply device for supplying urea and a device for decomposing urea water into ammonia have been required.

And the urea is frozen at a temperature of minus 11 degrees Celsius, there is a problem that the use of the urea is restricted in a low temperature environment.

An embodiment of the present invention provides an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system capable of efficiently reducing nitrogen oxides.

According to an embodiment of the present invention, an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system includes a main cylinder for generating a mechanical power by burning a hydrocarbon-based fuel and a main cylinder for generating a pyrolysis gas by pyrolyzing the hydrocarbon- A nitrogen oxide removing device (Lean NOx Trap) for reducing nitrogen oxide contained in the exhaust gas discharged from the main cylinder of the engine body using pyrolysis gas discharged from the pyrolysis gas generating cylinder , LNT).

Wherein the engine main body includes a main piston reciprocating linearly in the main cylinder, a main crankshaft converting a linear reciprocating force of the main piston into a rotational force to transmit power, a pyrolysis piston moving linearly reciprocating in the pyrolysis gas generating cylinder, And a pyrolysis crankshaft that converts the linear reciprocating force of the pyrolysis piston into a rotational force to transmit power. The pyrolysis gas generating cylinder and the pyrolysis piston may be operated at a relatively low speed and high load condition relative to the main cylinder and the main piston.

The pyrolysis gas generating cylinder may have a relatively smaller volume than the main cylinder.

The pyrolytic crankshaft may be connected to the main crankshaft at a speed reduction ratio to rotate at a lower speed than the main crankshaft.

Further, an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system includes a rotational speed sensor for measuring the rotational speed of the engine body, a nitrogen oxide sensor for measuring a nitrogen oxide concentration of the exhaust gas discharged from the main cylinder of the engine body An oxygen concentration sensor for measuring an oxygen concentration of a pyrolysis gas discharged from a pyrolysis gas generating cylinder of the engine body; and a controller for receiving information from the rotation speed sensor, the oxygen concentration sensor, and the nitrogen oxide concentration sensor, And a control device for controlling the air-fuel ratio by regulating the amount of fuel supplied to the pyrolysis gas generating cylinder.

The internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system includes a main exhaust passage connected to the nitrogen oxide removing device (LNT) for discharging the exhaust gas discharged from the main cylinder of the engine body to the outside, And a pyrolysis gas supply passage for transferring the pyrolysis gas discharged from the pyrolysis gas generating cylinder to the nitrogen oxide removal unit (LNT).

The pyrolysis gas may be at least one selected from the group consisting of carbon monoxide (CO), hydrocarbons (HC), hydrogen (H 2 ), water (H 2 O), carbon dioxide (CO 2 ), nitrogen (N 2 ), oxygen (O 2 ), nitrogen oxides , Or ammonia (NH 3 ).

The engine body may be a spark ignition type.

The internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system may further include a three-way catalytic device installed on the main exhaust passage between the main cylinder of the engine body and the nitrogen oxide removing device (LNT).

Further, the internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system may further include a particulate filter installed on the main exhaust passage upstream or downstream of the nitrogen oxide removing device (LNT) .

The engine body may be of the compression ignition type.

The internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system may be a diesel oxidation catalyst (DOC) device installed on the main exhaust flow path between the main cylinder of the engine body and the nitrogen oxide removing device (LNT) As shown in FIG.

Further, the internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system may further include a particulate filter installed on the main exhaust passage upstream or downstream of the nitrogen oxide removing device (LNT) .

The internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system may further include a branching flow path branched from the pyrolysis gas supply path and supplying the pyrolysis gas to the dust filtering filter.

Further, the internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system may further include an oxidation catalyst (OC) provided on the branch passage.

When regeneration of the particulate filter is required, the pyrolysis gas generating cylinder is operated in the lean air-fuel ratio state, and the high-temperature gas generated by inducing the catalytic combustion with the oxidation catalyst (OC) particulate filter, to regenerate a saturated particulate filter.

According to the embodiment of the present invention, the internal combustion engine having the pyrolysis gas generating cylinder and the exhaust gas purifying system can not only efficiently reduce the nitrogen oxides but also purify the exhaust gas as a whole.

1 is a configuration diagram of an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system according to a first embodiment of the present invention.
2 is a configuration diagram of an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system according to a second embodiment of the present invention.
3 and 4 are block diagrams of an internal combustion engine having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a third embodiment of the present invention.
5 is a configuration diagram of an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system according to a fourth embodiment of the present invention.
6 and 7 are block diagrams of an internal combustion engine having a pyrolysis gas generating cylinder and an exhaust gas purifying system according to a fifth embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In addition, in the various embodiments, components having the same configuration are represented by the same reference symbols in the first embodiment, and in the other embodiments, only the configurations different from those of the first embodiment will be described do.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element or component appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate an ideal embodiment of the present invention. As a result, various variations of the illustration are expected. Thus, the embodiments are not limited to any particular form of the depicted area, including variations in form, for example, by manufacture.

Hereinafter, an internal combustion engine 501 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a first embodiment of the present invention will be described with reference to FIG.

The internal combustion engine 501 according to the first embodiment of the present invention can be applied to various technical fields such as an automobile, a ship, or an industrial plant.

1, an internal combustion engine 501 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to the first embodiment of the present invention includes an engine body 101 and a nitrogen oxide removing apparatus (Lean NOx Trap, LNT ) ≪ / RTI >

The internal combustion engine 501 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the first embodiment of the present invention includes a main exhaust passage 220, a pyrolysis gas supply passage 230, and a three-way catalyst device 410 .

The internal combustion engine 501 having the pyrolysis gas generating cylinder and the exhaust gas purifying system further includes a rotation speed sensor 712, an oxygen concentration sensor 723, a nitrogen oxide concentration sensor 722, and a control device 700 can do.

In the first embodiment of the present invention, the engine body 101 includes a main cylinder 110, a pyrolysis gas generating cylinder 120, a main piston 115, a pyrolysis piston 125, a main crankshaft 119, And a pyrolysis crankshaft 129.

Further, in the first embodiment of the present invention, the engine body 101 may be a spark ignition type. Since the structure of the engine according to the spark ignition system is known to those skilled in the art, a detailed description thereof will be omitted.

In the first embodiment of the present invention, a plurality of main cylinders 110 may be provided and generate mechanical power by burning the hydrocarbon-based fuel.

The main cylinder 110 is provided with an intake valve and an exhaust valve. A mixer in which air and fuel are mixed through the intake valve may be introduced into the main cylinder 110 or the intake valve may be supplied with only air and the fuel may be supplied by a separate fuel injector provided in the main cylinder 110. [ Such a mixer is compressed in the main cylinder 110 at a high pressure and then ignited and burned to generate power due to the explosive force. The mixture combusted in the main cylinder 110 is exhausted to the outside of the main cylinder 110 through the exhaust valve.

In the first embodiment of the present invention, the mixture ratio of air and hydrocarbon-based fuel supplied to the main cylinder 110 is 14.7: 1 or more, which is the stoichiometric air-fuel ratio. That is, the main cylinder 110 burns the mixer under the lean air-fuel ratio condition.

However, the main cylinder 110 may instantaneously or temporarily burn the mixer under a rich air-fuel ratio condition. This means that the main cylinder 110 basically operates under a lean air-fuel ratio condition in an ideal situation, but may be operated temporarily under a rich air-fuel ratio condition depending on the situation.

Further, the main piston 115 linearly reciprocates in the main cylinder through four stroke cycles of intake, compression, expansion, and exhaust.

The main crankshaft 119 converts the linear reciprocating force of the main piston 115 into rotational force to transmit power.

In the first embodiment of the present invention, the pyrolysis gas generating cylinder 120 is supplied with a mixer in which air and a hydrocarbon-based fuel are mixed and pyrolyzes the fuel in an environment of high temperature and high pressure.

That is, in the first embodiment of the present invention, the mixing ratio of the air supplied to the pyrolysis gas generating cylinder 120 and the hydrocarbon-based fuel is 14.7: 1 or less, which is the stoichiometric air-fuel ratio. That is, the pyrolysis gas generating cylinder 120 pyrolyzes the mixer under a rich air-fuel ratio condition.

The air-fuel ratio of the air-fuel mixture supplied to the pyrolysis gas generating cylinder 120 can be adjusted so that the optimum pyrolysis gas can be generated according to the type of fuel, the compression ratio, the engine speed, and the like.

An ignition device, an intake valve, and an exhaust valve are also provided in the pyrolysis gas generating cylinder 120, and the pyrolysis gas generating cylinder 120 basically has the same structure as the main cylinder 110. However, the pyrolysis gas generating cylinder 120 has a relatively smaller volume than the main cylinder 110, and pyrolyzes the air-fuel mixture at a low-speed high load condition.

(CnHm) based fuel is decomposed together with air in the pyrolysis gas generating cylinder 120 according to an embodiment of the present invention, carbon monoxide (CO), hydrocarbons (HC), hydrogen (H 2 ), water (H 2 O) , At least one of carbon dioxide (CO 2 ), nitrogen (N 2 ), oxygen (O 2 ), nitrogen oxide (NOx), or ammonia (NH 3 ).

Thus, the pyrolysis gas produced cylinder 120 is carbon monoxide (CO), hydrocarbon (HC), hydrogen (H 2), water (H 2 O), carbon dioxide (CO 2), nitrogen (N 2), oxygen (O 2) , Nitrogen oxides (NOx), or ammonia (NH 3 ).

The pyrolysis piston 125 also reciprocates linearly in the pyrolysis gas generating cylinder 120 through four stroke cycles of intake, compression, expansion, and exhaust.

The pyrolysis crankshaft 129 is connected to power exchange with the pyrolysis piston 125. Further, the pyrolytic crankshaft 129 can be connected to the main crankshaft 119 with a reduction ratio to rotate at a lower speed than the main crankshaft 119.

However, the first embodiment of the present invention is not limited to this, and the pyrolysis crankshaft 129 may be connected to the driving belt of the auxiliary machinery used in the engine 101 having the pyrolysis gas generating function. In this case, the pyrolysis crankshaft 129 is decelerated to rotate at a relatively lower speed than the main crankshaft 119.

The main exhaust passage 220 discharges the exhaust gas discharged from the main cylinder 110 of the engine body 101 to the outside.

A nitrogen oxide removal equipment (Lean NOx Trap, LNT) 510 is installed on the main exhaust passage 220. That is, the main exhaust passage 220 connects the main cylinder 110 of the engine main body 101 and the nitrogen oxide removal apparatus (LNT) 510.

The nitrogen oxide removal equipment (LNT) 510 stores nitrogen oxides (NOx) contained in the exhaust gas discharged from the main cylinder 110, which combusts the mixer under a lean air-fuel ratio condition in which excess air is supplied, Thereby reducing nitrogen oxides (NOx) in the gas.

Specifically, the nitrogen oxide removal equipment (LNT) 510 has a storage catalyst including a nitrogen oxide storage material, and the storage catalyst is made of platinum (Pt), palladium (Pd), rhodium (Rh), barium (Sr), and potassium (K).

The nitrogen oxide removal device (LNT) 510 can remove nitrogen oxide stored in the storage catalyst by using hydrogen (H 2 ) and carbon dioxide (CO 2 ) as a reducing agent.

The pyrolysis gas supply passage 230 transfers the pyrolysis gas discharged from the pyrolysis gas generating cylinder 120 of the engine main body 101 to the nitrogen oxide removal equipment (LNT) 510.

The pyrolysis gases in the pyrolysis gas generated cylinder 120 is carbon monoxide (CO), hydrocarbon (HC), hydrogen (H 2), water (H 2 O), carbon dioxide (CO 2), nitrogen (N 2), oxygen ( O 2 ), nitrogen oxides (NO x), or ammonia (NH 3 ).

That is, hydrogen (H 2 ) and carbon dioxide (CO 2 ) among the pyrolysis gas supplied through the pyrolysis gas supply passage 230 can be used as a reducing agent for removing nitrogen oxides from the LNT 510.

In addition, the nitrogen oxide removal equipment (LNT) 510 may oxidize hydrocarbons (HC) and carbon monoxide (CO) in the pyrolysis gas to generate hydrogen (H 2 ) and carbon dioxide (CO 2 ). To this end, the nitrogen oxide removal equipment (LNT) 510 may further include an oxidation catalyst in addition to the storage catalyst.

As described above, according to the first embodiment of the present invention, the nitrogen oxide removal equipment (LNT) 510 removes exhaust gas discharged from the main cylinder 110 of the engine body 101 and moving through the main exhaust passage 220 (NOx) contained in the pyrolysis gas supply passage 230. The pyrolysis gas can be removed using the pyrolysis gas discharged from the pyrolysis gas generating cylinder 120 of the engine body 101 and moving through the pyrolysis gas supply passage 230 after the nitrogen oxide (NOx)

The rotation speed sensor 712 measures the number of revolutions of the engine 101 having the pyrolysis gas generating function. The oxygen concentration sensor 723 is disposed on the pyrolysis gas supply passage 230 to measure the oxygen concentration of the pyrolysis gas passing through the pyrolysis gas supply passage 230. The nitrogen oxide concentration sensor 722 is disposed on the main exhaust flow path 220 and measures the nitrogen oxide concentration of the exhaust gas passing through the main exhaust flow path 220.

An electronic control unit (ECU) 700 receives information from the rotational speed sensor 712, the oxygen concentration sensor 723, and the nitrogen oxide concentration sensor 722 and generates pyrolysis gas Thereby regulating the amount of fuel supplied to the cylinder 120. That is, the controller 700 controls the mixing ratio of the fuel and the air supplied to the pyrolysis gas generating cylinder 120.

Specifically, the control device 700 can grasp the state of the pyrolysis gas supplied to the nitrogen oxide removal equipment (LNT) 510 by the information measured by the rotation speed sensor 712 and the oxygen concentration sensor 723. The control device 700 can calculate the amount of pyrolysis gas necessary for reducing nitrogen oxides (NOx) in the nitrogen oxide removal equipment (LNT) 510 through the nitrogen oxide concentration sensor 722.

Thus, the control device 700 controls the amount of the fuel supplied to the pyrolysis gas generating cylinder 120 based on the information provided by the rotation speed sensor 712, the oxygen concentration sensor 723, and the nitrogen oxide concentration sensor 722 The amount of pyrolysis gas to be supplied to the nitrogen oxide removal equipment (LNT) 510 can be controlled by adjusting the amount of the pyrolysis gas.

On the other hand, the intake passage 210 can also supply a mixer to the main cylinder 110.

In FIG. 1, one intake passage 210 is shown as supplying a mixture to the main cylinder 110 and the pyrolysis gas generating cylinder 120, but this is merely exemplary. In other words, the mixer can be separately supplied to the main cylinder 110 and the pyrolysis gas generating cylinder 120 through the separate intake passage 210, or a separate fuel can be supplied to the main cylinder 110 or the pyrolysis gas generating cylinder 120 The injector can be provided to supply the fuel.

With such a construction, the internal combustion engine 501 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the first embodiment of the present invention not only can efficiently reduce nitrogen oxides (NOx) Can be purified.

Specifically, in the first embodiment of the present invention, the pyrolysis gas generating cylinder 120 of the engine main body 101 pyrolyzes a fuel-air mixture at a rich air-fuel ratio condition, LNT, < / RTI > 510).

That is, according to the first embodiment of the present invention, since the main cylinder 110 of the engine main body 101 can always operate in the lean operation condition without periodically repeating the lean air-fuel ratio operation and the rich air-fuel ratio operation, The overall fuel consumption of the main body can be improved, and the quietness of operation can be maintained.

Hereinafter, an internal combustion engine 502 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a second embodiment of the present invention will be described with reference to FIG.

2, an internal combustion engine 502 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a second embodiment of the present invention includes a main cylinder 110 of an engine body 102, Way catalytic device 420 provided on the main exhaust gas flow path 220 between the LNTs 510.

In the second embodiment of the present invention, the engine body 102 has the same structure as that of the first embodiment.

The main cylinder 110 of the engine main body 102 is exhausted from the main cylinder 110 and discharged from the main exhaust passage 220 to the main cylinder 110 because the mixer is burned under the lean air- When the exhaust gas flowing into the additional three-way catalyst device 420 is oxidized to reduce carbon monoxide (CO) and hydrocarbons (HC), the additional three-way catalytic converter 420 generates water (H 2 O ) and produces carbon dioxide (CO 2).

With such a construction, the internal combustion engine 502 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the second embodiment of the present invention is capable of not only the nitrogen oxide (NOx) contained in the exhaust gas but also the carbon monoxide (CO) Hydrogen (HC) can also be efficiently reduced.

Specifically, the nitrogen oxide removal equipment (LNT) 510 reduces the nitrogen oxides (NOx) contained in the exhaust gas using the pyrolysis gas supplied through the pyrolysis gas supply passage 230, The three way catalytic converter 420 installed in the exhaust gas can reduce the carbon monoxide (CO) and the hydrocarbon (HC) contained in the exhaust gas.

Hereinafter, an internal combustion engine 503 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a third embodiment of the present invention will be described with reference to FIG.

3, an internal combustion engine 503 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to the third embodiment of the present invention includes a main cylinder 110 of the engine body 103, A three-way catalyst device 420 provided on the main exhaust gas flow path 220 between the LNT 510 and the main exhaust gas flow path 220 on the downstream side of the nitrogen oxide removal device LNT 510, filter, PF) 810, as shown in FIG.

4, the three-way catalyst device 420 and the nitrogen oxide removal device (LNT) 510 are provided between the three-way catalytic converter 420 and the nitrogen oxide removal device (LNT) 510. However, the third embodiment of the present invention is not limited to the above- The main exhaust passage 220 may be provided on the main exhaust passage 220.

In the third embodiment of the present invention, the engine body 103 has the same structure as that of the first embodiment.

The main cylinder 110 of the engine main body 103 is discharged from the main cylinder 110 and discharged from the main exhaust passage 220 to the main cylinder 110 because the main cylinder 110 burns the mixer under the lean air- When the exhaust gas flowing into the three-way catalytic converter 420 is actively oxidized to reduce carbon monoxide (CO) and hydrocarbons (HC), the three-way catalytic converter 420 converts water (H 2 O) and carbon dioxide CO 2 ).

Further, a particulate filter (PF) 810 can remove particulate matter (PM) contained in the exhaust gas flowing through the main exhaust passage 220.

With such a configuration, the internal combustion engine 503 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the third embodiment of the present invention is capable of not only the nitrogen oxides (NOx) contained in the exhaust gas but also the carbon monoxide Hydrogen (HC) and particulate matter (PM) can be efficiently reduced.

Specifically, the nitrogen oxide removal equipment (LNT) 510 reduces the nitrogen oxides (NOx) contained in the exhaust gas using the pyrolysis gas supplied through the pyrolysis gas supply passage 230, The three way catalytic converter 430 provided in the exhaust gas purifying catalyst reduces carbon monoxide (CO) and hydrocarbons (HC) contained in the exhaust gas and the particulate filter 810 can remove the particulate matter PM contained in the exhaust gas .

Hereinafter, an internal combustion engine 504 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a fourth embodiment of the present invention will be described with reference to FIG.

The engine body 104 of the internal combustion engine 504 having the pyrolysis gas generating cylinder and the exhaust gas purifying system according to the fourth embodiment of the present invention may be a compression ignition type. The structure of the engine according to the compression ignition system is well known to those skilled in the art, and thus a detailed description thereof will be omitted.

The engine main body 104 according to the fourth embodiment of the present invention also includes the main cylinder 110 and the pyrolysis gas generating cylinder 120 and has the same technical characteristics as those of the first embodiment Respectively.

5, the internal combustion engine 504 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the fourth embodiment of the present invention includes a main cylinder 110 of the engine body 104, And a diesel oxidation catalyst (DOC) device 460 installed on the main exhaust flow path 220 between the LNTs 510.

The diesel oxidation catalyst device 460 includes a catalyst formed of platinum (Pt), palladium (Pd), rhodium (Rh) or the like, and a carrier of a ceramic or metal supporting the catalyst. At this time, the support may be formed of aluminum oxide (Al 2 O 3 ), cerium oxide (CeO 2 ), zirconia (ZrO 2 ), or the like.

The diesel oxidation catalyst device 460 primarily functions to oxidize nitrogen monoxide (NO) to nitrogen dioxide (NO 2 ). It is important to increase the ratio of nitrogen dioxide (NO 2 ) in the nitrogen oxides (NOx) contained in the exhaust gas to efficiently remove nitrogen oxides (NOx) from the nitrogen oxide removal equipment (LNT) 510.

Further, the diesel oxidation catalyst device 460 may reduce carbon monoxide (CO) and hydrocarbons (HC).

The diesel oxidation catalyst device 460 may also burn particulate matter (PM) contained in the exhaust gas by burning hydrocarbon (HC) contained in the exhaust gas.

With such a construction, the internal combustion engine 504 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the fourth embodiment of the present invention is capable of supplying not only nitrogen oxides (NOx) but also carbon monoxide (CO) and hydrocarbons It can be efficiently reduced.

Particularly, even when the engine body 104 is of the compression ignition type, nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC) can be efficiently reduced.

Specifically, the nitrogen oxide removal equipment (LNT) 510 reduces the nitrogen oxides (NOx) contained in the exhaust gas using the pyrolysis gas supplied through the pyrolysis gas supply passage 230, The diesel oxidation catalyst device 460 installed in the diesel oxidation catalyst 460 can reduce carbon monoxide (CO) and hydrocarbons (HC).

Hereinafter, an internal combustion engine 505 having a pyrolytic gas generating cylinder and an exhaust gas purifying system according to a fifth embodiment of the present invention will be described with reference to FIG.

In a fifth embodiment of the present invention, the engine body 105 may be a compression ignition type. The structure of the engine according to the compression ignition system is well known to those skilled in the art, and thus a detailed description thereof will be omitted.

The engine main body 105 according to the fifth embodiment of the present invention also includes the main cylinder 110 and the pyrolysis gas generating cylinder 120 and has the same technical characteristics as those of the first embodiment Respectively.

6, the internal combustion engine 505 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the fifth embodiment of the present invention includes a main cylinder 110 of the engine body 105, A diesel oxidation catalyst (DOC) device 460 installed on the main exhaust gas flow path 220 between the main exhaust gas passage (LNT) 510 and the main exhaust gas flow path 220 may include a particulate filter (PF) 810.

7, the diesel oxidation catalyst device 460 and the nitrogen oxide removal device (LNT) 510 are connected to each other through a filter (not shown) The main exhaust passage 220 may be provided on the main exhaust passage 220.

In the fifth embodiment of the present invention, the internal combustion engine 505 having the pyrolysis gas generating cylinder and the exhaust gas purifying system is branched from the pyrolysis gas supply passage 230 and is connected to the branch for supplying the pyrolysis gas to the particulate filter 810 A flow path 240 and an oxidation catalyst (OC) device 470 provided on the branch flow path 240. A control valve 234 may be provided at a branch point between the pyrolysis gas supply passage 230 and the branch passage 240.

A diesel oxidation catalyst device 460 to increase the rate of nitrogen dioxide (NO 2) in the nitrogen oxide (NOx) contained in exhaust gas by oxidizing a nitrogen monoxide (NO) to nitrogen dioxide (NO 2), carbon monoxide (CO) and hydrocarbons ( HC).

A particulate filter (PF) 810 can remove particulate matter (PM) contained in the exhaust gas flowing through the main exhaust passage 220.

The control device 700 controls the control valve 234 to supply the thermal decomposition gas 810 to the dust filter 810 through the branch passage 240 when the particulate matter PM trapped by the particulate matter PM is saturated, . At this time, the controller 700 controls the pyrolysis gas generating cylinder 120 to operate in the lean air-fuel ratio state so as to generate the high-temperature gas required for the smoke filtering filter 810.

The oxidation catalyst device 470 is used for the chemical reaction between hydrocarbons (HC), carbon monoxide (CO), oxygen (O 2 ), hydrogen (H 2 ), particulate matter (PM) and nitrogen oxides So that a high-temperature gas required for regeneration of the soot filter 810 is generated. The control device 700 controls the air-fuel ratio of the pyrolysis gas cylinder 120 so that the oxidation catalyst device 470 can generate the above-described high-temperature gas.

With such a construction, the internal combustion engine 505 having the pyrolytic gas generating cylinder and the exhaust gas purifying system according to the fifth embodiment of the present invention can be used not only for nitrogen oxides (NOx), but also for carbon monoxide (CO), hydrocarbons The particulate matter (PM) can also be efficiently reduced.

Specifically, the nitrogen oxide removal equipment (LNT) 510 reduces the nitrogen oxides (NOx) contained in the exhaust gas using the pyrolysis gas supplied through the pyrolysis gas supply passage 230, The diesel oxidation catalyst device 460 installed in the diesel particulate filter 460 reduces carbon monoxide (CO) and hydrocarbons (HC), and the particulate filter 810 can remove the particulate matter PM.

In the fifth embodiment of the present invention, when the smoke filtering filter 810 is saturated, the pyrolysis gas may be supplied through the branching passage 240 to regenerate the smoke filtering filter 810.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being described in the foregoing specification is defined by the appended claims, Ranges and equivalents thereof are to be construed as being included within the scope of the present invention.

101, 102, 103, 104, 105, 106: engine body
110: main cylinder 115: main piston
119: main crankshaft 120: pyrolysis gas generating cylinder
125: Pyrolysis piston 129: Pyrolysis crankshaft
210: intake duct 220: main exhaust duct
230: pyrolysis gas supply passage 234: control valve
240: branching flow path 470: oxidation catalyst device
460: Diesel oxidation catalyst device
501, 502, 503, 504, 505, 506: internal combustion engine having pyrolysis gas generating cylinder and exhaust gas purifying system
510: nitrogen oxide removal device (LNT) 700: control device
712: rotation speed sensor 722: nitrogen oxide concentration sensor
723: Oxygen concentration sensor 810: Smoke filtering filter

Claims (15)

An engine body including a main cylinder for generating a mechanical power by burning a hydrocarbon-based fuel, and a pyrolysis gas generating cylinder for pyrolyzing the hydrocarbon-based fuel at a rich air-fuel ratio to generate pyrolysis gas; And
A nitrogen oxide removal apparatus (Lean NOx trap) (LNT) for reducing nitrogen oxides contained in the exhaust gas discharged from the main cylinder of the engine body using pyrolysis gas discharged from the pyrolysis gas generating cylinder; And
A main exhaust passage connected to the nitrogen oxide removal unit (LNT) for discharging the exhaust gas discharged from the main cylinder of the engine body to the outside; And
And a pyrolysis gas supply passage for transferring the pyrolysis gas discharged from the pyrolysis gas generating cylinder of the engine body to the nitrogen oxide removal equipment (LNT)
A pyrolysis gas generating cylinder and an exhaust gas purifying system.
The pyrolysis gas may be at least one selected from the group consisting of carbon monoxide (CO), hydrocarbons (HC), hydrogen (H 2 ), water (H 2 O), carbon dioxide (CO 2 ), nitrogen (N 2 ), oxygen (O 2 ), nitrogen oxides , Or ammonia (NH 3 ).
The engine body is of a compression ignition type,
A diesel oxidation catalyst (DOC) device installed on the main exhaust flow path between the main cylinder of the engine main body and the nitrogen oxide removal device (LNT); And
A particulate filter installed on the main exhaust passage upstream of the nitrogen oxide removal device (LNT) or on the main exhaust passage downstream of the nitrogen oxide removal device (LNT); And
A pyrolysis gas supply passage for introducing pyrolysis gas into the pyrolysis gas supply passage,
Further comprising a pyrolysis gas generating cylinder and an exhaust gas purifying system. The method of claim 1,
The engine body includes:
A main piston reciprocating linearly in the main cylinder;
A main crankshaft for converting a linear reciprocating force of the main piston into a rotational force to transmit power;
A pyrolysis piston reciprocating linearly in the pyrolysis gas generating cylinder; And
A pyrolysis crankshaft which converts a linear vortex motion force of the pyrolysis piston into a rotational motion force and transmits power
Further comprising:
Wherein the pyrolytic gas generating cylinder and the pyrolytic piston have a pyrolytic gas generating cylinder and an exhaust gas purifying system operating at a relatively low speed and high load condition relative to the main cylinder and the main piston. 3. The method of claim 2,
Wherein the pyrolytic gas generating cylinder has a volume relatively smaller than that of the main cylinder and an exhaust gas purifying system. 3. The method of claim 2,
And the pyrolytic crankshaft has a pyrolysis gas generating cylinder and an exhaust gas purifying system connected to the main crankshaft at a speed reduction ratio so as to rotate at a lower speed than the main crankshaft. 5. The method of claim 4,
A rotational speed sensor for measuring the rotational speed of the engine body;
A nitrogen oxide concentration sensor for measuring a nitrogen oxide concentration of the exhaust gas discharged from the main cylinder of the engine body;
An oxygen concentration sensor for measuring an oxygen concentration of the pyrolysis gas discharged from the pyrolysis gas generating cylinder of the engine body; And
A controller for receiving the information from the rotation speed sensor, the oxygen concentration sensor, and the nitrogen oxide concentration sensor and controlling the air-fuel ratio by controlling the amount of fuel supplied to the pyrolysis gas generating cylinder,
Further comprising a pyrolysis gas generating cylinder and an exhaust gas purifying system. delete delete delete delete delete delete delete delete delete 6. The method according to any one of claims 1 to 5,
Further comprising an oxidation catalyst (OC) provided on the branch flow path, and an exhaust gas purifying system.
KR1020140003193A 2014-01-10 2014-01-10 Internal combustion engine having pyrolysis gas generating cylinder and exhaust gas purifying system KR101526102B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH094441A (en) * 1995-06-22 1997-01-07 Mitsubishi Motors Corp Internal combustion engine
JP2000130223A (en) * 1998-10-29 2000-05-09 Toyota Motor Corp Exhaust emission control system of multi-cylinder internal combustion engine
JP2000352337A (en) * 1999-06-10 2000-12-19 Honda Motor Co Ltd Exhaust emission control system for internal combustion engine
JP2011032997A (en) * 2009-08-05 2011-02-17 Denso Corp Air-fuel ratio detection device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH094441A (en) * 1995-06-22 1997-01-07 Mitsubishi Motors Corp Internal combustion engine
JP2000130223A (en) * 1998-10-29 2000-05-09 Toyota Motor Corp Exhaust emission control system of multi-cylinder internal combustion engine
JP2000352337A (en) * 1999-06-10 2000-12-19 Honda Motor Co Ltd Exhaust emission control system for internal combustion engine
JP2011032997A (en) * 2009-08-05 2011-02-17 Denso Corp Air-fuel ratio detection device

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