KR19980046668A - Secondary combustion device of exhaust gas - Google Patents

Abstract

The present invention relates to a secondary combustion apparatus for exhaust gases that secondary combustion of harmful exhaust gases (HC, CO), which are particularly emitted during cold start of an engine, between an exhaust manifold and a catalytic converter, and the fuel supplied to the combustion apparatus. And poor mixing of the air, thereby reducing the ignition and combustion characteristics. To this end, the present invention consists of a technical configuration in which a mixing chamber 12 for promoting the formation of a mixture of fuel and air is provided between the burning chamber 4 and the fuel supply pipe 5 and the intake pipe 8. The mixing chamber is provided with a swirl generator 13 for facilitating the formation of a mixture of fuel and air therein, and is connected to the mixing chamber by a mixer pipe 14. According to this configuration, the fuel and air are smoothly mixed by the mixing chamber, and the formation of the mixer is promoted by the swirl generator, which is supplied to the burning chamber, and is ignited and burned by the discharge of the spark plug, thereby exhaust gas. Perfectly removes harmful components of

Description

Secondary combustion device of exhaust gas

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary combustion apparatus for exhaust gas, and in particular, regenerates harmful exhaust gases (HC, CO), which are frequently discharged during cold start of an engine, between an exhaust manifold and a catalytic converter. The present invention relates to a secondary combustion device for exhaust gas, which is capable of reducing the harmful components of the exhaust gas by quenching.

As is well known, the exhaust system of an automobile is provided with an exhaust manifold, an exhaust pipe, a catalytic converter and a muffler to exhaust the exhaust gas combusted in the combustion chamber of an engine to the outside.

In such an exhaust system, the exhaust gas discharged from the combustion chamber includes water vapor (H ₂ O), nitrogen (N ₂ ), carbon dioxide (CO ₂ ), and the like, which are harmless to humans, but carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides ( Toxic substances such as NOx).

As a method for removing the harmful components of the exhaust gas, there is a conventionally known catalytic converter method that allows the exhaust gas discharged through the exhaust manifold to pass through the catalytic converter, thereby purifying using an oxidation or reduction catalyst.

In addition, conventionally, a secondary air supply apparatus is proposed in which fresh air is blown into the exhaust gas to reduce the content of CO and HC, and then the exhaust gas is sent to the catalytic converter to maximize the purification efficiency of the catalyst. have.

However, the catalytic converter and the secondary air supply apparatus generate excessive harmful gas components due to the rich mixer at the initial start-up, ie, cold start of the engine, and require a predetermined temperature and residence time for activation of the catalyst. It will not be possible to remove the gas component effectively.

For this reason, conventionally, a secondary combustion apparatus has been proposed in which exhaust gas discharged from a combustion chamber is re-burned in an exhaust system and purified again by a catalytic converter.

1 shows a secondary combustion apparatus of a conventionally known exhaust gas.

Reference numeral 1 in the drawings refers to the combustion chamber of the engine. The exhaust gas discharged from the combustion chamber 1 is sent to the catalytic converter 3 through the exhaust pipe 2.

Here, the exhaust pipe 2 is provided with a burning chamber 4 for secondary combustion of the exhaust gas discharged from the combustion chamber 1.

The burning chamber 4 is connected with a fuel supply pipe 6 for supplying fuel for recombustion of exhaust gas, and the fuel supply pipe 6 is interposed with a pressure regulator 5 via a valve 7. Connected.

In addition, an intake pipe 8 for supplying air for reburning the exhaust gas is connected to the burning chamber 4, and the intake pipe 8 is interposed between the air pump 9 and the valve 10. Connected.

According to this configuration, when the valves 7 and 10 are opened by the ECU, fuel and air are supplied into the burning chamber 4 to form a mixer, and at this time, the spark plug 11 by the ECU The exhaust gas is reburned as the discharge is performed.

The exhaust gas thus reburned is sent to the catalytic converter 3 by reducing harmful components, particularly HC and CO, and is purified and discharged to the outside.

In the secondary combustion apparatus of the exhaust gas described in the prior art, fuel and air are supplied to the burning chamber and mixed therein, but there is a problem that the formation of the mixer becomes poor because it is simply injected into the chamber.

Due to this problem, conventionally, the ignition in the burning chamber is difficult, and often causes a problem that the flame is turned off.

The present invention has been proposed for the purpose of solving the above-mentioned problems of the prior art, by activating the formation of a mixture of fuel and air supplied to the burning chamber, so that the secondary combustion of the exhaust gas is well achieved, and the harmfulness of the exhaust gas Allows the components to burn out perfectly.

1 is a block diagram showing an exhaust gas secondary combustion device of a typical vehicle.

Figure 2 is a block diagram showing a secondary combustion device of the exhaust gas according to the present invention.

* Description of the symbols for the main parts of the drawings *

2: exhaust pipe 3: catalytic converter

4: Burning chamber 5: Fuel supply pipe

6: Fuel pressure regulator 7, 10: valve

8: intake pipe 9: air pump

11: spark plug 12: mixing chamber

13: Swirl generator 14: Mixer pipe

As a means for realizing the above object, the secondary combustion device of the exhaust gas according to the present invention has a technical configuration in which a mixing chamber of fuel and air is provided in a fuel supply pipe and an intake pipe supplied to a burning chamber.

The mixing chamber is connected to a fuel supply pipe and an intake pipe, and a swirl generator is installed inside the mixing chamber to facilitate the formation of a mixture of fuel and air, and a mixer pipe supplied to the burning chamber is connected to the mixing chamber.

According to this configuration, the valve controlled by the ECU opens the fuel supply pipe and the intake pipe to the mixing chamber, whereby fuel and air are supplied, and the formation of the mixer is activated by the swirl generator and sent to the burning chamber.

The mixer supplied to the burning chamber is ignited by the discharge of the spark plug and combusted with the exhaust gas, thereby reducing the harmful components of the exhaust gas. In this case, secondary combustion of the above-described exhaust gas is well realized by an appropriate mixer, thereby perfectly reducing the content of harmful components, particularly HC and CO, of the exhaust gas.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment for implementing this invention is demonstrated in detail based on an accompanying drawing.

EXAMPLE

2 is an overall configuration diagram showing a secondary combustion device of exhaust gas according to the present embodiment.

In describing the present embodiment, the same reference numerals are used for the clarity of description for the configuration of the present embodiment that is the same as the drawings cited in the prior art.

Reference numeral 1 in the drawings refers to the combustion chamber. The exhaust gas combusted in the combustion chamber 1 is discharged through the exhaust manifold in the exhaust formation of the engine.

An exhaust pipe 2 is provided between the exhaust manifold and the catalytic converter 3, and the exhaust pipe 2 reduces harmful components of the exhaust gas discharged through the exhaust manifold during initial startup, that is, during cold start of the engine. In order to achieve this, a secondary combustion device of exhaust gas is installed.

Here, the secondary combustion device of the present embodiment is provided with a mixing chamber 12 in order to activate the formation of a mixture of fuel and air which are mixed with the exhaust gas discharged to the burning chamber 4 and reburned.

More specifically, a burning chamber 4 is provided in the exhaust pipe 2 connected between the exhaust manifold and the catalytic converter 3.

The spark plug 11 is installed in the burning chamber 4, and the mixing chamber 12 is connected through the mixer pipe 14 of fuel and air.

The mixing chamber 12 is again connected with a fuel supply pipe 6 for supplying fuel for recombustion of exhaust gas, and the fuel supply pipe 6 is interposed with a valve 7 between the pressure regulator 5. Is connected.

In addition, the mixing chamber 4 is connected with an intake pipe 8 for supplying air for reburning the exhaust gas, and the intake pipe 8 is interposed between the air pump 9 and the valve 10. Connected.

The mixing chamber 4 configured as described above has a structure in which a swirl generator 13 is installed therein in order to further activate the fuel and air mixer.

Based on the configuration of the present embodiment described above, when the valves 7 and 8 controlled by the ECU open the fuel supply pipe 5 and the intake pipe 8, fuel and air are mixed in the present embodiment. Flows into (12), mixes therein and is activated by the swirl generator (13).

The mixture of fuel and air thus formed is supplied to the burning chamber 4, ignited by the discharge of the spark plug 11 controlled by the ECU, and burned together with the exhaust gas, thereby reducing harmful components of the exhaust gas.

Through the embodiments described above, it can be seen that the secondary combustion device of the exhaust gas according to the present invention substantially solves the problems of the prior art.

That is, according to the present invention, the secondary ignition and combustion characteristics of the exhaust gas can be improved by promoting the activation of harmful components of the exhaust gas, in particular HC and CO, and the mixer.

In addition, according to the present invention, the catalytic converter is once again purified by the catalytic converter in a state where the harmful components of the exhaust gas are reduced, so that the harmful exhaust gas can be reduced to a perfect level.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims, various modifications Would be possible.

Claims (2)

A secondary combustion apparatus for exhaust gas, in which a large amount of harmful exhaust gas, which is particularly discharged during cold start-up of an engine, is re-burned in an exhaust system and sent back to a catalytic converter for purification. A mixing chamber, a fuel pressure regulator connected to the mixing chamber via a fuel supply pipe and a valve provided at the fuel supply pipe, an air pump connected to the mixing chamber via an intake pipe and a valve provided at the intake pipe; And a spark plug installed in the burning chamber, and an electronic control unit for controlling opening and closing of the valves and ignition timing of the spark plug. The secondary combustion apparatus of claim 1, wherein a swirl generator is installed in the mixing chamber.