KR100548451B1 - Inner flame burner for regeneration of diesel particulate filter - Google Patents

Abstract

According to the present invention, a combustion chamber into which the exhaust gas of the engine flows through at least one connection pipe connected to the exhaust gas flow path of the diesel engine; A vaporizer for vaporizing the introduced liquid fuel; A mixed gas supply unit for mixing the fuel vaporized in the vaporizer and the external air for combustion to produce a mixed gas of fuel and air; A mixed gas storage chamber installed in the combustion chamber to receive the mixed gas from the mixed gas supply unit and to store the mixed gas in an instant; A flame retardant composed of a mat-type porous medium such that the mixed gas supplied from the mixed gas storage chamber is sprayed from the outside to the inside thereof and disposed inside the combustion chamber so that the exhaust gas introduced into the combustion chamber through the connecting pipe flows therein; An igniter for igniting a flame in the mixed gas injected into the flame retardant combustion machine; And a flame detector for detecting the presence of flames on the surface of the flame retarder. A burner for regenerating a diesel engine particulate filter is provided. According to the burner for regenerating the diesel diesel particulate filter, since the flame is formed shortly from the surface of the flame retardant to the inner surface, it is possible to maintain a stable flame even in a rapidly changing operating condition of the diesel engine, especially from the edge of the exhaust gas. Since heat from the flame is transferred, the temperature distribution of the exhaust gas can be made uniform.

Diesel Engine, Soot Filter, DPF, Filter, Metal Fiber, Burner, Combustor, Flame Retardant Combustor

Description

Inner flame burner for regeneration of diesel particulate filter

1 is a view showing an example of a conventional diesel engine particulate filter;

2 is a combination diagram showing a diesel engine particulate filter applying a burner for regenerating the diesel engine particulate filter according to the first embodiment of the present invention;

3 is a view showing a burner for regenerating a diesel engine particulate filter according to a second embodiment of the present invention;

4 to 7 is a view showing a burner for regenerating a diesel engine particulate filter according to a third embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

100 Flame Retardant ...

102 ... ignition power supply 103 ... flame detector

110.Mixed gas supply unit 120 ... Carburetor

130 Combustion chamber 131,137 Connector

133 Flow homogenizer 134 Mixed gas storage room

135 Uniform Homogenizer 136 Turning Machine

140 ... filter 150 ... outlet

160 ... electronic control unit

The present invention relates to a diesel engine particulate filter (DPF), and more particularly, to regenerate a diesel engine particulate filter for regenerating a particulate filter for filtering particulate matter contained in exhaust gas of a diesel engine. It's about a burner.

The use of diesel engines is common in trains, ships, and industrial vehicles, and the use of diesel engines is gradually increasing with the recent launch of diesel passenger cars.

This trend of increasing usage of diesel engines is increasing the emissions of particulate matter (PM), such as soot and SOF (Soluble Organic Fraction), contained in the exhaust gas emitted from diesel engines. Regulations are gradually being tightened due to environmental pollution, especially air pollution.

In order to solve the problem of environmental pollution as described above, various methods for a diesel engine particulate filter (DPF) for collecting and treating soot to prevent emissions of soot particles generated from diesel vehicles and the like into the atmosphere have been studied.

1 shows a diesel engine particulate filter disclosed in Korean Patent Laid-Open Publication No. 2003-0003599 as an example of a conventional diesel engine particulate filter for reducing the soot of a diesel engine.

Referring to the drawings, the conventional diesel engine particulate filter, the main body 10 is provided with a monolithic ceramic filter 11 for filtering the soot particles contained in the exhaust gas discharged from the diesel engine, and the filter 11 A burner 1 for the regeneration of the device is provided. The burner 1 includes a combustor 4, an ignition rod 5, and the like that inject the mixed fuel supplied by the fuel pump 2 and the air pump 3.

In the conventional diesel engine particulate filter as described above, the soot particles contained in the exhaust gas discharged from the engine is collected by the ceramic filter 11, if the amount collected in the filter 11, the pressure loss of the filter portion This increase greatly affects the back pressure of the diesel engine. Therefore, the soot collected in the filter should be periodically removed from the filter 11 when a certain pressure loss occurs. In this case, the soot oxidation temperature (generally 600 ° C.) is used to remove the soot particles from the filter 11. The method of raising the temperature of the exhaust gas and oxidizing (burning) the soot particles collected in the filter 11 to remove it from the filter 11 is used. At this time, the flame of the burner 1 is used as a means of a heat supply device for raising the temperature of the exhaust gas above the oxidation temperature of the soot particles collected in the filter 11. That is, when particulate matter such as carbon is collected to some extent in the filter 11, the internal pressure sensed by the pressure sensor 6 is increased, and the controller 7 receiving the signal generates particulate matter collected in the filter 11. The burner 1 is operated to burn the fuel. Then, the ignition rod 5 ignites the fuel injected into the combustor 4, and the internal temperature of the exhaust passage 20 rapidly rises while the flame-retarder 8 maintains the flame. Accordingly, the soot particles collected in the filter 11 are burned and disappeared, and the filter 11 can be used to capture the soot particles newly discharged again.

However, in the conventional liquid fuel injection burner as described above, the flame generated in the combustion process is formed very long as illustrated in the figure. If the flame is formed in this way, even if there is the base 8, the stabilization of the flame state is not maintained, and the stability of the flame is greatly affected by the operating conditions of the engine. That is, the diesel engine has a disadvantage in that the flame does not reach a stable state due to a severe change in the exhaust gas discharge rate and the pressure condition discharged from the engine, and the flame is unstable as the flame shakes in the exhaust gas, and thus it is not maintained and is easily extinguished. Practical use as a burner for a soot filtration device is very difficult.

In particular, in the acceleration or deceleration section of the diesel engine, the width of the exhaust gas flow rate or the pressure increase or decrease becomes more severe. This makes the flame very unstable or extinguished, making it difficult to stably raise and maintain the temperature in the exhaust flow path 20. For this reason, the regeneration operation through smooth oxidation of the soot collected in the filter 11 also becomes difficult. In other words, stable flames can be maintained under constant operating conditions, such as idling, constant speed sections or when the engine is stopped.However, flames cannot be maintained and easily turned off during periods of changing engine operating conditions such as engine acceleration or deceleration sections. This makes it impossible to perform the soot particle combustion operation, that is, the filter regeneration operation, collected by the filter 11. In this case, since the state of the soot collecting filter 11 is gradually worsened, there is a problem that the filter 11 does not play a role as a soot particle collecting device.

The present invention has been made in view of the above necessity, and is an improved burner for regenerating a diesel engine smoke filter for maintaining a constant and stable flame state in an exhaust gas stream without being affected by sudden changes in operating conditions of a diesel engine. The purpose is to provide.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. In addition, the objects and advantages of the invention may be realized by the means and combinations indicated in the claims.

The burner for regenerating the diesel engine particulate filter of the present invention for achieving the above object includes a combustion chamber into which the exhaust gas of the engine is introduced through at least one connection pipe connected to the exhaust gas flow path of the diesel engine; A vaporizer for vaporizing the introduced liquid fuel; A mixed gas supply unit for mixing a fuel vaporized in the vaporizer and external air for combustion to produce a mixed gas of fuel and air; A mixed gas storage chamber installed in the combustion chamber to receive the mixed gas from the mixed gas supply unit and to store the mixed gas in an instant; A flame resistant mat is formed of a porous porous medium so that the mixed gas supplied from the mixed gas storage chamber is injected from the outside to the inside, and the exhaust gas introduced into the combustion chamber through the connecting pipe flows therein. burner; An igniter for igniting a flame in the mixed gas injected into the flame retardant combustion unit; It includes; and a flame detector for detecting the presence of a flame on the surface of the flame retardant flame retarder.

The burner for regenerating the diesel engine particulate filter may further include at least one swirler at the inlet of the combustion chamber so that exhaust gas flow may be introduced into the flame retardant combustion apparatus installed inside the combustion chamber in a swirl flow state. Can be.

In addition, the connecting pipe may be installed in a direction tangential to the combustion chamber cross section so that the exhaust gas flow can be introduced into the flame retardant combustion apparatus installed inside the combustion chamber in a swirl flow state.

In addition, the flame retardant group preferably has a cyclone shape.

In addition, the diesel engine particulate filter regeneration burner is installed between the mixed gas supply unit and the mixed gas storage chamber in an annular shape concentric with the combustion chamber so that the flow of the mixed gas flowing into the mixed gas storage chamber is controlled by the combustion chamber. It may further comprise a flow homogenizing device to be uniform in the radial direction.

In addition, the burner for regenerating the diesel engine particulate filter is installed inside the mixed gas storage chamber so that the pressure distribution of the mixed gas is uniform in the longitudinal direction of the combustor so that a uniform flow rate device for equalizing the longitudinal flow velocity of the mixed gas is further provided. It may include.

The vaporizer may include a vaporization chamber in which liquid fuel is vaporized, an atomizer for atomizing the liquid fuel into fine droplets, and supplying the vaporization chamber to the vaporization chamber, and for transporting the vaporized fuel to the mixed gas supply unit. It is preferable to include a transfer air inlet line to form a passage through which the outside air flows.

Here, the transfer air inflow line is arranged so that a portion thereof passes through the exhaust gas flow path of the diesel engine, and the external air for transport introduced through the transfer air inflow line is preheated after exchanging heat with the exhaust gas of the diesel engine. It is preferable to flow into the firebox.

The mixed gas supply unit further includes a mixing chamber in which combustion external air and vaporized fuel are mixed to form a mixed gas, and a combustion air inlet communicating with the mixing chamber to form a passage through which the external air for combustion flows into the mixing chamber. A line, a fuel inlet line communicating with the mixing chamber and the vaporization chamber to form a passage through which the vaporized fuel flows into the mixing chamber, and a mixed gas mixed in the mixing chamber by communicating with the mixing chamber and the mixed gas storage chamber. It may include a mixed gas inlet line to form a passage to the gas storage chamber.

Here, the inflow passage of the external air for combustion and the mixing chamber formed in the combustion air inlet line is preferably a venturi shape in which the cross-sectional area is reduced according to the flow of the external air for combustion.

In addition, the combustion air inlet line is arranged so that a portion thereof passes through the exhaust gas flow path of the diesel engine, and the external air for combustion introduced through the combustion air inflow line is preheated after heat exchange with the exhaust gas of the diesel engine to mix the mixture. It is preferable to flow into the chamber.

On the other hand, the burner for regeneration of the diesel engine particulate filter, the temperature and pressure of at least one point in the combustion chamber, the flow rate of the external air for transport flowing into the vaporization chamber, the temperature and pressure inside the vaporization chamber, and the mixed gas supply The flow rate, temperature and pressure of the external air for combustion flowing into the unit, the flow rate of the liquid fuel supplied from the fuel pump, the temperature and pressure of the exhaust gas after passing the soot filtration device, the flame retardant, igniter, flame detector And an electronic control unit which electronically controls the operation of the fuel pump, respectively.

here. The carburetor is controlled by the electronic control unit, the solenoid valve for controlling the flow rate of the transfer external air flowing through the transfer air inlet line, and the temperature and pressure in the vaporization chamber to detect the signal and the electronic control It is preferred to include a temperature and pressure sensor provided to the unit.

In addition, the mixed gas supply unit, the solenoid valve for controlling the flow rate of the external air for combustion, which is controlled by the electronic control unit, and senses the temperature and pressure of the external air for combustion and the signal is the electronic control It is preferred to include a temperature and pressure sensor provided to the unit.

Further, the burner for regenerating the diesel engine particulate filter may include a clean air supply line communicating with the outside so as to supply fresh external air to the ignition part of the igniter, and controlled by the electronic control unit to control the clean air supply line. It may further include an electronic valve for adjusting the flow rate of fresh external air introduced through.

In addition, the burner for regenerating the diesel engine particulate filter may include a clean air supply line communicating with the outside so as to supply fresh outside air to the flame detection unit of the flame detector, and controlled by the electronic control unit to supply the clean air. It may further include an solenoid valve for controlling the flow rate of fresh external air flowing through the line.

In addition, the electronic control unit, it is preferable to control the burner to operate when the difference between the pressure value detected before and after the soot filtration device is more than a predetermined value, and to stop the operation of the burner when the difference in pressure value is less than the predetermined value. Do.

In addition, it is preferable that at least one refractory insulating material selected from the group consisting of ceramic wool, cerac wool and refractory brick is lined on the inner wall of the combustion chamber.

In addition, the porous medium forming the flame resistant flame retardant is preferably any one selected from the group consisting of metal fibers, ceramics and foamed metal.

In addition, the flame retardant flame retarder preferably has any one shape selected from the group consisting of a cylindrical, conical, tubular and combinations thereof in which a hollow portion defining the exhaust gas flow path is defined.

In addition, the burner for regenerating the diesel engine particulate filter may be further provided with a heat-resistant metal mesh spaced apart from the inside of the flame retardant to radiate heat exchange with the inner surface of the flame retardant.

In addition, the flame resistant flame retarder may be further provided with a porous support coupled to the outside of the porous medium to support the form of the porous medium.

In addition, the igniter is preferably one selected from a spark plug for generating an electrical spark and igniting the mixed gas, or a glow plug for igniting the mixed gas with an end portion glowing.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly introduce the concept of terms in order to best explain their invention. Based on the principle that the definition can be made in a simple manner, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

2 is a combination diagram showing a diesel engine particulate filter applying a burner for regenerating the diesel engine particulate filter according to the first embodiment of the present invention.

As illustrated, the burner for regenerating the diesel engine particulate filter according to the first embodiment of the present invention includes a filter having one end connected to the exhaust gas flow path through at least one connecting pipe 131 and the other end collecting the smoke ( Connected to a soot filtration device as shown in FIG. The burner for regenerating the diesel engine particulate filter is an flame flame-type flame retarder (100) made of a porous matt metal fiber (metal fiber) for burning vaporized fuel, and the flame retarder (100). A vaporizer 120 for vaporizing the fuel supplied to the gas, a mixed gas supply unit 110 for injecting a gas mixture of the fuel vaporized in the vaporizer 120 and the external air for combustion into the flame retardant combustion apparatus 100, and a diesel engine. And a combustion chamber 130 in which the exhaust gas is introduced, and the flame retardant combustion apparatus 100 is disposed therein, and an electronic control unit 160 for electronically controlling the operation of the burner.

The flame resistant combustor 100 is made of a porous medium such that the mixed gas supplied into the combustion chamber 130 is injected from the outer surface toward the inner surface, and the combustion chamber 130 flows through the inside of the exhaust gas introduced through the connection pipe 131. ) Is placed inside. As the porous medium constituting the flame resistant flame retarder 100, mat-type metal fibers, foamed metals, ceramics, etc. having high heat resistance may be used. The flame resistant flame retarder 100 may be further provided with a porous support 106 to be coupled to the outside of the porous medium to support the form of the porous medium.

Meanwhile, the heat resistant metal mesh 107 may be installed in the flame retardant flame chamber 100 to be spaced apart from the inner surface of the flame retard flame burner 100. The heat resistant metal mesh 107 radiates heat to the inner surface of the flame retardant 100, thereby raising the temperature of the exhaust gas flowing in the surroundings very high.

The vaporizer 120 includes a vaporization chamber 121 in which liquid fuel is vaporized, and fine droplets of liquid fuel (eg, diesel) pumped from a fuel tank (not shown) by the fuel pump 128. An atomizer 122 (eg, an ultrasonic atomizer, etc.) for atomizing the gas and supplying it to the vaporization chamber, and a vaporization heat source 123 for supplying heat to vaporize in a gaseous state; A temperature and pressure sensor 124 for sensing a temperature and pressure of the vaporization chamber 121 and supplying a signal to the electronic control unit 160; A transfer which forms an inflow passage of the transfer external air introduced into the vaporization chamber 121 in order to partially mix the gaseous fuel in the vaporization chamber 121 with the combustion air and transfer the vaporized fuel. The liquid of the atomized fuel in the atomizer 122 and the solenoid valve 126 for electronically controlling the flow volume of the external air for conveyance supplied through the air inflow line 125, this conveyed air inflow line 125, It consists of a droplet transfer line 127 and the like for introducing the enemy into the vaporization chamber 121.

The mixed gas supply unit 110 is configured to supply a mixed gas of fuel and air to the flame retardant combustion apparatus 100 after mixing of the fuel gasified in the vaporizer 120 and external air for combustion occurs. A mixing chamber 111 in which the external air for combustion and the vaporized fuel are mixed to form a mixed gas, and a combustion in communication with the mixing chamber 111 to form a passage through which the external air for combustion flows into the mixing chamber 111. A fuel inlet line 113 and a mixing chamber 111 that communicate with the air inlet line 112, the mixing chamber 111, and the vaporization chamber 121 to form a passage through which the vaporized fuel flows into the mixing chamber 111. ) And a mixed gas inlet line 114 communicating with the combustion chamber 130 to form a passage through which the mixed gas mixed in the mixing chamber 111 flows into the combustion chamber 130. Here, the flow path of the external air for combustion flowing into the mixing chamber 111 through the combustion air inlet line 112 is configured in a venturi (ventury) shape having a gradually reduced cross-sectional area. At this time, the low pressure in the venturi and the mixed gas of the transfer external air and the fuel formed in the vaporization chamber 121 of the vaporizer 120 by the connection of the venturi and the fuel inlet line 113 supply the mixed gas. The effect of being sucked into the mixing chamber 111 of the unit 110 is added, and it is more smooth to supply the mixed gas of fuel and air to the flame retardant combustion apparatus 100.

The mixed gas of fuel and air supplied through the mixed gas supply unit 110 is an annular form concentric with the inner surface of the combustion chamber 130 by a flow homogenizer 133 formed of a porous medium such as honeycomb. After flowing into the mixed gas storage chamber 134 in a very uniform flow state in the radial direction of the combustion chamber, it is ejected through the surface of the flame retardant combustion apparatus 100 made of a porous medium installed inside the combustion chamber, wherein the power supply device 102 When a high voltage is supplied to the igniter 101 from the igniter 101, an electrical discharge occurs, and the mixed gas ejected from the surface of the flame resistant combustor 100 to the inner surface is ignited, and thus from the surface of the flame resistant combustor 100. A flame is formed toward its inner direction.

The igniter 101 may have a low ignition performance due to contamination by adhesion of foreign matter such as smoke. Therefore, as the igniter 101, a glow plug for igniting the mixed gas due to the glowing end may be used. If a spark plug is used as the igniter 101 to generate an electrical spark to ignite the mixed gas, the igniter 101 must be kept clean at all times. To this end, the clean air inlet line 104 may be provided to form a passage through which fresh external air flows into the ignition unit of the igniter 101. In addition, the igniter 101 has to be stopped when the flame is formed in the flame retarder 100, so that the flame detector 103 for detecting that the flame is formed on the flame retarder 100 is installed, such a flame The detector 103 is also kept clean by the clean air inlet line 104 which forms a passage through which fresh external air flows into the flame detector of the flame detector 103.

The combustion chamber 130, which is a space into which the exhaust gas discharged from the diesel engine flows, includes a fireproof heat insulating material 132 to insulate all wall surfaces in contact with the outside. In the combustion chamber 130, a temperature and pressure sensor 138 for detecting temperature and pressure is installed, and a connection pipe 131 that is an exhaust gas flow path is connected. And each burner component, such as the flame retarder 100, the igniter 101, the flame detector 103, the clean air inflow line 104, which is a flame-forming part, is installed in the combustion chamber 130.

Meanwhile, the solenoid valves 126, 115, 105, and 129 are provided to control the flow rate of the external air for transport, the flow rate of the external air for combustion, the flow rate of the clean air, and the flow rate of the fuel pump, and the solenoid valves 126, 115, 105, and 129 are electronically controlled. The amount of opening and closing is controlled by the signal exchange with the unit 160, the operation control of the igniter 101, the power supply 102, the flame detector 103, and the like, the internal temperature of the vaporizer 120 and the combustion chamber and In the sensing and control of the pressure sensor 138, the feedback control for the normal operation of all the components is performed by the electronic control unit 160.

The burner according to the present invention having the configuration as described above can be operated as follows.

First, when the exhaust gas is discharged through the discharge pipe 150 through the interior of the flame retardant combustion apparatus 100 disposed in the combustion chamber 130 in accordance with the operation of the diesel engine, it is included in the exhaust gas Particulate matter including soot particles, SOF, and the like are collected by the filter 140 installed between the combustion chamber 130 and the discharge pipe 150. At this time, when the amount of particulate matter such as soot collected in the filter 140 increases, this causes a pressure loss of the filter 140 to gradually increase, and the temperature and pressure sensor 138 and the filter 140 in front of the filter 140. The temperature and pressure sensor 141 at the rear stage continuously transmits the measured pressure and temperature signals at the front and rear ends of the filter 140 to the electronic control unit 160. At this time, when the pressure difference between the front and rear ends of the filter 140 is greater than or equal to a predetermined size, the burner operates as follows by the operation command signal of the burner transmitted from the electronic control unit 160.

Liquid fuel is atomized liquid droplets from the atomizer 122 by the operation of the fuel pump 128 flows into the vaporization chamber 121, the gaseous fuel vaporized by the vaporization heat source 123 is a transfer air inlet line 125 After mixing with the external air for transport introduced through the), it is introduced into the mixing chamber 111 of the mixed gas supply unit 110 through the fuel inlet line 113. At this time, the external air for combustion flows into the mixing chamber 111, and as a result, the mixed gas of fuel and combustion air is stored in the mixed gas storage chamber 134 through the flow homogenizer 133, and quantitatively flame resistant combustor 100 And is supplied into the exhaust gas flowing inside the flame retardant combustion apparatus 100. At this time, when power is supplied from the high voltage power supply device 102 to the igniter 101, the igniter 101 operates. Flame is formed in the direction from the surface of the flame retarder 100 toward the inside of the combustion chamber.

After the flame is formed on the flame retardant flame burner 100, the flame signal is transmitted to the electronic control unit 160 by the flame detector 103, and the igniter is transmitted by the signal transmission from the electronic control unit 160 to the igniter 101. The operation of 101 is stopped, and then a stable flame state is maintained on the surface of the flame retarder 100.

At this time, the flame formed on the flame retardant flame burner 100 increases the temperature of the exhaust gas flowing into the combustion chamber 130 above the oxidation temperature of the soot to oxidize the soot collected in the filter 140 to regenerate the filter 140.

When the pressure difference between the front and rear ends of the filter 140 is returned to the original state by the oxidation of the smoke, the fuel pump 128 is stopped by the signal from the electronic control unit 160, and the operation of the fuel pump 128 is stopped. As a result, the fuel vaporization in the vaporizer 120 is stopped, and the supply of the external air for transfer and the external air for combustion is also stopped by the operation of the solenoid valves 126, 115, 105, and 129, so that the flame on the inner surface of the flame retardant burner 100 is extinguished. . Based on the pressure difference between the front and rear end of the filter 140 in which soot is collected, the above-described series of ignition, flame state maintenance, and fire extinguishing are repeated according to the signal of the electronic control unit 160. The regeneration process is performed continuously and very stably even during engine operation.

In addition, the electronic control unit 160 automatically adjusts the flow rate of fuel, transport and combustion external air to an optimal state according to the change in the operating conditions of the engine, so that the engine of the flame retardant 100 is suddenly changed even in a sudden change of the engine operating conditions. The flame of is not extinguished and can remain stable.

On the other hand, most conventional diesel engine smoke filter regeneration burners are liquid fuel injection type burners, and when the load fluctuations of the diesel engine change suddenly, the flame is turned off and the flames are not maintained. The burner for regenerating the smoke filter was only able to operate the burner only in the idling state, the stopped state and the constant speed operation state of the diesel engine, and thus could not be used for the actual regeneration of the diesel engine smoke filter.

However, in the present invention, since the flame retarder 100, which is a part for forming a flame, is made of a porous material serving as a plurality of fine injection holes such as metal fibers, a plurality of very short flames are formed simultaneously. In addition, the heat retained on the flame retardant flame (100) surface prevents flame extinguishment, and can be ignited on the entire surface in a very short time, and the flame generated in the flame retardant flame (100) is the exhaust gas flow. Since it is formed at the edge, even if the operating conditions of the engine change suddenly, such as the acceleration / deceleration section of the engine, and the exhaust gas flow rate changes rapidly, the flame retardant flame arrester 100 is sufficiently heated and the flame size itself is small. The change of the flame is also extremely fine level so that the flame zone of the flame retardant flame (100) can be kept very stable.

As a result, in the first embodiment of the present invention, when the flame is formed on the flame retardant flame burner 100 surface and the exhaust gas flows into the flame retardant flame burner 100 disposed in the combustion chamber 130, the operating state of the diesel engine is Flame stabilization in the exhaust gas stream is achieved as well as idling and in constant speed operation, where there is little change in the load of the diesel engine. It is a burner for regenerating a diesel engine particulate filter device of a new concept in which the ignition and extinguishing and flame stabilization are maintained on the surface of the flame retardant 100 even in the case of rapid change.

On the other hand, the shape and configuration of the configuration of the present invention, as well as shown in the above description, even if the components are added or subtracted to improve the operation smoothness of the device, in principle, liquid fuel is vaporized to gaseous fuel, porous metal Using a porous material such as a mat, a metal fiber mat, a porous ceramic, a foamed metal and a foamed ceramic, the flame retardant 100 is installed at the edge of the combustion chamber into which the exhaust gas flows as in the present invention, so that the heat generated by the flame is exhausted. Burners for regenerating diesel engine particulate filters having similar heat transfer from the edge of the burner to the central area, or burners for similar use, are included in the scope of the present invention.

In addition, the liquid fuel atomizer 122 using ultrasonic waves may be installed between the fuel pump 128 and the vaporization chamber 121 in order to further increase the vaporization performance of the vaporizer 120. Of course, even if no atomizer is installed and using only a liquid fuel vaporizer, the object of the present invention can be achieved, and also the vaporization means of the liquid fuel in the configuration of the present invention, although not vaporized by heat, All devices for gasifying liquid fuel are considered to be included in the category of vaporizers.

In addition, in the first embodiment of the present invention is introduced into the mixing chamber 121 of the external air and the mixed gas supply unit 110 for transporting into the vaporization chamber 121 of the vaporizer 120 of the configuration of the present invention. Although the external air for combustion was described as introducing air at room temperature, it was preheated through a heat exchange process by high temperature exhaust gas through the exhaust gas discharged from the engine before entering the vaporization chamber 121 and the mixing chamber 121. After the configuration, it is also possible to configure the shape to be introduced into the vaporizer 120 and the mixed gas supply unit 110.

In addition, the configuration of the flame retardant flame burner 100 of the configuration of the present invention described in this embodiment as a cylindrical cylindrical shape, but is not limited to this exhaust gas through the hollow portion of the flame retardant flame retarder 100 diesel engine If enough can be introduced into the soot filtration device, it will be clear. In addition, in the flame retardant flame retarder 100 in the present embodiment is illustrated in the form of a mat using a porous metal fiber, it can be composed of a porous metal, foam metal, porous ceramics, and other highly heat-resistant porous material, of course. to be.

Hereinafter, a burner for regenerating a diesel engine particulate filter according to a second embodiment of the present invention will be described in detail with reference to FIG. 3. However, detailed description of parts overlapping with those described in the first embodiment of the present invention described above will be omitted.

In the first embodiment of the present invention described above, the gas vaporized in the vaporizer 120 (see FIG. 2) adopts a configuration in which the gas vaporized instantaneously is stored in the mixed gas storage chamber 134 via the flow homogenizer 133. In the second embodiment, as shown in FIG. 3, a homogenizing fluidizer 135 is further installed inside the mixed gas storage chamber 134.

In general, when the mixed gas is ejected from the mixed gas storage chamber 134 to the inner surface of the flame retardant flame retarder 100, the ejection speed in the longitudinal direction of the flame retardant flame retarder 100 in each of the longitudinal direction of the flame retardant flame retarder 100 It may have a different distribution at the position of.

This phenomenon is caused by the influence of the pressure distribution in the longitudinal direction in the mixed gas storage chamber 134 because the distance between the flame retardant flame burner 100 and the combustion chamber 130 wall surface is constant, the second embodiment of the present invention As in the example, the influence of the above-described pressure distribution in the longitudinal direction can be eliminated by the configuration of the uniform fluidization apparatus 135 installed inside the mixed gas storage chamber 134.

Hereinafter, a burner for regenerating a diesel engine particulate filter according to a third embodiment of the present invention will be described in detail with reference to FIGS. 4 to 7. Here too, detailed descriptions of parts overlapping with the above description will be omitted.

In the third embodiment of the present invention, by utilizing the technical idea to make the swirl flow state in which the swirl acts when the exhaust gas flows into the combustion chamber from the diesel engine, the regeneration efficiency of the present invention is maximized. To make it possible.

That is, since the flame generated in the flame retardant combustion apparatus 100 is formed at the edge of the combustion chamber 130, that is, outside of the exhaust gas flow, the flame is essentially a structure that is not significantly affected by fluctuations in the exhaust gas flow. Heat transfer to the exhaust gases is achieved primarily by convection and radiant heat transfer. At this time, the magnitude of the temperature rise of the exhaust gas and the temperature rise time are greatly influenced by the heat transfer mechanism between the flame and the exhaust gas flow, and in this case, if the exhaust gas flow is a swirl flow, it may have very advantageous characteristics in terms of heat and mass transfer. In addition, particulate matter such as soot contained in the exhaust gas is moved to the edge of the combustion chamber 130 by the centrifugal force of the swing flow, and at this time, particulate matter such as soot in the flame zone formed at the edge of the combustion chamber 130. The concentration of particulate matter such as soot is very low in the exhaust gas which is finally oxidized and finally introduced into the filter 140, so that the amount of soot collected while the constant pressure difference of the filter 140 appears is small, and thus the filter 140 The performance and life of the can be greatly improved.

That is, since the burner ignition interval is increased with respect to the same pressure of the filter 140, the life of the filter 140 may be greatly increased, and as the ignition interval is increased, the amount of fuel consumed for generating flames may be greatly reduced.

The formation of such a swirl flow can be made by changing the configuration and other configuration of the surface-burning burner of the present invention as follows.

First, as shown in Figure 4, in the present invention, if the rotor 136 is provided at the inlet of the combustion chamber 130, the exhaust gas flows into the combustion chamber 130, the exhaust gas flowing into the combustion chamber 130 in the swing flow state 130 It is introduced into, in which case a burner for regenerating the diesel engine particulate filter including the various advantages mentioned above can be constructed. In addition, as shown in FIG. 5, the second embodiment of the configuration in which the gas vaporized in the vaporizer 120 is instantaneously stored in the mixed gas storage chamber 134 via the flow homogenizer 133 (FIG. 3). It is possible to further install a homogenizing fluidizer (135) corresponding to the inside of the mixed gas storage chamber 134, to remove the influence of the pressure distribution in the longitudinal direction.

Second, as shown in FIG. 6, in the present invention, the connecting pipe 137 is installed in a tangential direction with respect to the cross section of the combustion chamber 130 so that the exhaust gas flows in the tangential direction of the combustion chamber 130, and thus, the combustion chamber 130 is connected to the combustion chamber 130. The introduced exhaust gas is introduced into the combustion chamber 130 in a swirling flow state. In this case, a burner for regenerating the diesel engine particulate filter including various advantages mentioned above may be configured. In addition, the homogenizing fluidization device 135 of the configuration in which the gas vaporized in the vaporizer 120 (see FIG. 2) is instantaneously stored in the mixed gas storage chamber 134 via the flow homogenization device 133. Further installation in the mixed gas storage chamber 134, it is possible to eliminate the influence of the pressure distribution in the longitudinal direction.

Third, as shown in FIG. 7, in the present invention, the connecting pipe 137 is installed in a tangential direction with respect to the cross section of the combustion chamber 130 so that the exhaust gas flows in the tangential direction of the combustion chamber 130, and furthermore, If the shape of 100) is configured into a cyclone shape that utilizes the centrifugal force to the maximum, in this case, as well as including the various advantages mentioned above, the load fluctuation due to the sudden change in the operating conditions of the diesel engine due to the formation of the negative pressure inside the combustion chamber The effect of offsetting the pressure increase is more effective to form a more stable flame zone even under the sudden fluctuations of the engine load. In addition, preferably the same gas as the cyclone flame retardant flame (100) of the cyclone-shaped configuration in which the gas vaporized in the vaporizer 120 is instantaneously stored in the mixed gas storage chamber 134 via the flow homogenizer 133. By further installing the uniform fluidizing device 135 in the mixed gas storage chamber 134, it is possible to eliminate the influence of the pressure distribution in the longitudinal direction.

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this, The person of ordinary skill in the art to which this invention belongs, Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

As described above, the diesel engine particulate filter regeneration burner of the present invention provides the following effects.

First, in the present invention, unlike the prior art, the flame retardant, which forms the flame, is made of porous metal fibers serving as a plurality of fine injection holes, which enables instant ignition and extinguishing, and after the flame is formed on the flame retardant surface, the exhaust gas is formed. When the gas flows into the combustion chamber, flame stabilization in the exhaust gas stream is, of course, achieved when the operating state of the diesel engine is at idle and constant speed operation with little load variation of the diesel engine. Ignition and extinguishment are performed even when the operation of the burner with the flame is occurring while the exhaust gas discharged from the diesel engine is flowing into the combustion chamber, but the load fluctuation of the diesel engine changes rapidly and the flow rate and pressure of the exhaust gas change rapidly. It is a new burner for regenerating diesel engine particulate filter that can stabilize flame.

In addition, since the surface of the porous mat-type flame retardant of cylindrical or tubular metal fiber material is relatively wide, heat transfer from the flame zone to the exhaust gas is very fast and a uniform temperature distribution can be maintained for the entire combustion chamber.

In addition, particulate matter such as soot contained in the exhaust gas moves to the edge of the flow due to swirl fluidization of the exhaust gas, and the particulate matter is oxidized by the flame zone formed at the edge of the flow, and the exhaust gas is introduced into the filter. As the concentration of particulate matter contained therein is reduced, and the exhaust gas of low particulate matter concentration is introduced into the filter, the life of the filter is increased and the ignition interval of the burner is extended to reduce the fuel consumption required for flame generation.

In addition, thermal insulation materials such as ceramic wool and refractory bricks installed on the inner wall of the combustion chamber may have a simultaneous effect of thermal insulation and heat storage.As a result of the heat storage, oxidation of the smoke attached to the thermal insulation material occurs on the surface of the thermal insulation material so that the insulation is always kept clean. Can be.

In addition, since the flame stabilization is achieved, the burner type diesel engine particulate filter can be regenerated, so that the regeneration of the filter is performed reliably, and thus serves as an environmental pollution prevention device due to the discharge of soot.

After all, the burner of the present invention can be used for filter regeneration of the exhaust gas soot reduction device of all engines using diesel engines such as trains, ships, diesel vehicles, etc., and is applicable as a burner for other uses other than diesel engines. It is very broad and can have a great effect in terms of environmental pollution prevention.

Claims (23)

A combustion chamber into which the exhaust gas of the engine flows through at least one connection pipe connected to the exhaust gas flow path of the diesel engine; A vaporizer for vaporizing the introduced liquid fuel; A mixed gas supply unit for mixing a fuel vaporized in the vaporizer and external air for combustion to produce a mixed gas of fuel and air; A mixed gas storage chamber installed in the combustion chamber to receive the mixed gas from the mixed gas supply unit and to store the mixed gas in an instant; A flame resistant mat is formed of a porous porous medium so that the mixed gas supplied from the mixed gas storage chamber is injected from the outside to the inside, and the exhaust gas introduced into the combustion chamber through the connecting pipe flows therein. burner; An igniter for igniting a flame in the mixed gas injected into the flame retardant combustion unit; And Burner for regeneration of a diesel engine particulate filter comprising a; flame detector for detecting the presence of flame on the surface of the flame retardant. The method of claim 1, And at least one swirler at the inlet of the combustion chamber to allow the exhaust gas flow to flow into the flame retardant combustion apparatus installed inside the combustion chamber in a swirl flow state. burner. The method of claim 1, The connecting pipe is a burner for regenerating a diesel engine particulate filter, characterized in that the exhaust gas flow is installed in a tangential direction to the combustion chamber cross section so that the exhaust gas flow into the interior of the flame retardant combustion apparatus installed in the combustion chamber. According to claim 1, The flame retardant flame retarder, Burner for regeneration of diesel engine particulate filter, characterized in that it has a cyclone shape. The method according to any one of claims 1 to 4, A flow homogenizing device is installed between the mixed gas supply unit and the mixed gas storage chamber in an annular shape concentric with the combustion chamber so that the flow of the mixed gas flowing into the mixed gas storage chamber is uniform in the radial direction of the combustion chamber. Burner for regenerating diesel engine smoke filter, characterized in that. The method of claim 5, Regeneration of the diesel engine particulate filter installed in the mixed gas storage chamber further comprises a uniform flow rate device for equalizing the longitudinal flow velocity of the mixed gas by making the pressure distribution of the mixed gas uniform in the longitudinal direction of the combustor. Dragon burner. The vaporizer of claim 1, wherein the vaporizer is Vaporization chamber in which liquid fuel is vaporized, An atomizer for atomizing liquid fuel into fine droplets and supplying the vaporization chamber; And a transfer air inlet line for forming a passage through which external air for transfer into the vaporization chamber is introduced to transfer the vaporized fuel to the mixed gas supply unit. The method of claim 7, wherein The transfer air inflow line is arranged so that a portion thereof passes through the exhaust gas flow path of the diesel engine so that the external air for transport introduced through the transfer air inflow line is preheated after exchanging heat with the exhaust gas of the diesel engine and into the vaporization chamber. Burner for regeneration of diesel engine particulate filter, which is introduced. The method of claim 7, wherein the mixed gas supply unit, A mixing chamber in which the external air for combustion and the vaporized fuel are mixed to form a mixed gas, Combustion air inlet line communicating with the mixing chamber to form a passage for the external air for combustion flows into the mixing chamber, A fuel inlet line communicating with the mixing chamber and the vaporization chamber to form a passage through which the vaporized fuel flows into the mixing chamber; And a mixed gas inlet line communicating with the mixing chamber and the mixed gas storage chamber to form a passage through which the mixed gas mixed in the mixing chamber flows into the mixed gas storage chamber. The method of claim 9, Burner for regeneration of the diesel engine particulate filter, characterized in that the inlet passage of the external air for combustion formed in the combustion air inlet line and the mixing chamber has a venturi shape in which the cross-sectional area is reduced according to the flow of the external air for combustion. . The method of claim 9, The combustion air inlet line is disposed so that a portion thereof passes through the exhaust gas flow path of the diesel engine so that the external air for combustion introduced through the combustion air inflow line is preheated after heat exchange with the exhaust gas of the diesel engine and then into the mixing chamber. Burner for regeneration of diesel engine particulate filter, which is introduced. The method of claim 7, wherein At least one temperature and pressure in the combustion chamber; The flow rate of the external air for transfer into the vaporization chamber, the temperature and pressure inside the vaporization chamber, Flow rate, temperature and pressure of the external air for combustion flowing into the mixed gas supply unit; The flow rate of the liquid fuel supplied to the vaporizer, The temperature and pressure of the exhaust gas after passing through the soot filtration system, Operation of the flame retarder, igniter, flame detector and fuel pump Burner for regeneration of the diesel engine particulate filter, characterized in that it further comprises an electronic control unit for electronically feedback control. The method of claim 12, wherein the vaporizer, The solenoid valve is controlled by the electronic control unit to adjust the flow rate of the external air for transport flowing through the transfer air inlet line; And a temperature and pressure sensor for sensing a temperature and a pressure in the vaporization chamber and providing a signal to the electronic control unit. The method of claim 12, wherein the mixed gas supply unit, An solenoid valve controlled by the electronic control unit to regulate a flow rate of the external air for combustion; And a temperature and pressure sensor for sensing the temperature and pressure of the external air for combustion and providing a signal to the electronic control unit. The method of claim 12, A clean air supply line communicating with the outside to supply fresh outside air to the ignition part of the igniter; And a solenoid valve controlled by the electronic control unit to adjust a flow rate of fresh external air introduced through the clean air supply line. The method of claim 12, A clean air supply line communicating with the outside to supply fresh outside air to the flame detection unit of the flame detector; And a solenoid valve controlled by the electronic control unit to adjust a flow rate of fresh external air introduced through the clean air supply line. The method of claim 12, The electronic control unit may control the burner to operate when the difference between the pressure values sensed before and after the soot filtration device is greater than or equal to a predetermined value, and to stop the operation of the burner when the difference between the pressure values is less than the predetermined value. Burner for regeneration of diesel engine smoke filter. The method of claim 1, Burner for regenerating diesel engine particulate filter, characterized in that the inner wall of the combustion chamber is lined with at least one refractory insulation material selected from the group consisting of ceramic wool, cerac wool and refractory brick. The method of claim 1, Burner for regenerating the diesel engine smoke filter device, characterized in that the porous medium forming the flame retardant is any one selected from the group consisting of metal fiber (metal), ceramic and foamed metal. The method of claim 19, The flame retardant flame retarder for regenerating a diesel engine particulate filter, characterized in that it has any one shape selected from the group consisting of a cylindrical, conical, square and combinations thereof having a hollow portion defining the exhaust gas flow path. burner. The method of claim 1, Burner for regenerating the diesel engine smoke filter device characterized in that it further comprises a heat-resistant metal mesh which is spaced apart in the flame retarder and radiant heat exchange with the inner surface of the flame retarder. The method of claim 1, The flame retardant flame retarder is burner for regeneration of the diesel engine particulate filter characterized in that it further comprises a porous support coupled to the outside of the porous medium to support the form of the porous medium. The igniter of claim 1, wherein the igniter A burner for regenerating a diesel engine particulate filter, wherein the spark plug for generating an electrical spark and igniting the mixed gas is selected from the glow plugs that ignite the mixed gas by glowing an end portion thereof.

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