JP2012032049A - Burner device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To burn more fuel in a burner device, which is arranged in the flow of a gas fluid between a diesel engine and a filter (DPF) for removing particulate matter in the exhaust gas of the diesel engine, for generating a hot gas by ignition to a fuel-air mixture containing fuel and oxygen.SOLUTION: The burner device includes: a circulation flow forming unit 10, which is installed at a downstream side of a section where the hot gas Z is generated, and which is composed of a baffle plate for forming a circulation flow R; and a heating element 11 consisting of a glow plug in the circulation flow.

Description

  The present invention relates to a burner device.

Fine particles (particulate matter) are contained in exhaust gas such as diesel engines. In recent years, a filter (DPF) for removing particulates in exhaust gas has been installed in vehicles equipped with diesel engines, etc., because there is concern about the environmental impact of releasing the particulates into the atmosphere. Has been.
This filter is formed of ceramics or the like, which is a porous body having a plurality of pores smaller than the fine particles, and collects the fine particles by preventing the fine particles from passing therethrough.

However, when such a filter is used for a long time, the collected fine particles are accumulated and the filter becomes clogged.
In order to prevent such clogging of the filter, for example, as disclosed in Patent Document 1, a method of burning and removing particulates collected in the filter by supplying a high-temperature gas to the filter is known. It is used.

  Specifically, for example, a burner device is installed between a diesel engine and a filter, a gas mixture in which exhaust gas and fuel are mixed is burned to generate hot gas, and the hot gas is supplied to the filter. The fine particles are burned by this.

JP 2007-154772 A

By the way, in the burner device, it is necessary to increase the temperature of the high-temperature gas to a temperature at which the filter can be regenerated, and in order to do so, it is necessary to burn a predetermined amount of fuel.
However, when the oxygen concentration in the exhaust gas or the like supplied to the burner device decreases, unburned fuel remains without flowing completely and flows downstream, and is provided upstream of the filter. There was a risk of fouling the catalyst.
If the catalyst is polluted with unburned fuel in this way, in addition to the obstacle to raising the catalyst to the activation temperature, the fuel adhering during the next regeneration process burns and becomes high temperature, reducing the life of the catalyst. There was a fear.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to burn more fuel in a burner device.

  The present invention adopts the following configuration as means for solving the above-described problems.

  1st invention is the burner apparatus which is provided in the middle of the flow of gas fluid, and ignites the air-fuel | gaseous mixture containing fuel and oxygen, and produces | generates high temperature gas, Comprising: On the downstream of the location where the said high temperature gas is produced | generated. A configuration is adopted in which a circulating flow forming means that is installed to form a circulating flow is provided.

  According to a second invention, in the first invention, the circulating flow forming means is constituted by a baffle plate that is exposed to the flow of the high-temperature gas.

  According to a third invention, in the first or second invention, a configuration is provided in which a heating element is provided in the circulation flow formed by the circulation flow forming means.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the heating element is composed of a glow plug.

  A fifth invention adopts a configuration in which, in the fourth invention, the heating element is disposed on the downstream side of the circulating flow forming means.

According to the present invention, the circulation flow forming means for forming the circulation flow is provided downstream of the location where the high temperature gas is generated. When the remaining amount of fuel remains, it can be burned using the residence time.
Therefore, according to the present invention, more fuel can be burned in the burner device.

It is sectional drawing which shows schematic structure of the burner apparatus in one Embodiment of this invention. It is the XX sectional view taken on the line of FIG.

  Hereinafter, an embodiment of a burner device according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a cross-sectional view showing a schematic configuration of the burner device S1 of the present embodiment. 2 is a cross-sectional view taken along line XX of FIG.
This burner device S1 is connected to an exhaust port of an exhaust gas exhaust device such as a diesel engine disposed on the upstream side, and generates a high temperature gas Z by mixing and burning the exhaust gas X containing oxygen and fuel. The high-temperature gas Z is supplied to a downstream filter, and is disposed, for example, between a diesel engine and a particulate filter. And the burner apparatus S1 of this embodiment is provided with the supply flow path 1 and the combustion part 2. FIG.

  The supply flow path 1 is a flow path for passing exhaust gas X supplied from a device such as a diesel engine and supplying it directly to the filter, one end of which is an exhaust port of a device such as a diesel engine. It is constituted by a cylindrical pipe connected and having the other end connected to the filter.

  The combustion unit 2 is connected to the supply flow path 1 and generates a high-temperature gas by mixing and burning a part of the exhaust gas X flowing through the supply flow path 1 and fuel inside. The combustion unit 2 includes a tube unit 4, a fuel injection device 5, an ignition device 7, a partition member 8, and an auxiliary combustion air supply device 9.

  The tube part 4 is a tubular member that forms the outer shape of the combustion part 2, and the inside is hollow. And the inside of the tube part 4 is connected to the supply channel 1 from above. Further, in the burner device S <b> 1 of the present embodiment, the inside of the tube body portion 4 is connected to the supply flow channel 1 from the vertical direction. In addition, the horizontal cross-sectional shape of the tube part 4 is a rectangle.

  The fuel injection device 5 supplies an amount of fuel N necessary for the regeneration of the filter, and is fixed to the side wall of the tube portion 4. Then, the fuel N is injected toward the ignition device 7 (that is, into the ignition region R2).

The ignition device 7 ignites an air-fuel mixture Y composed of supplied fuel and exhaust gas X, and is fixed to the ceiling of the tube portion 4. The ignition device 7 includes a glow plug 7a and a fuel holding portion 7b installed at the tip thereof.
In addition, the fuel holding part 7b is comprised from the porous body formed with a metal net | network, a sintered metal, a metal fiber, a glass cloth, a ceramic porous body, a ceramic fiber, a pumice stone etc., for example.

  The partition member 8 maintains the inside of the tube part 4 in an exhaust gas flow path region R1 for taking in the exhaust gas X, an ignition region R2 in which the ignition device 7 is installed, and combustion of the air-fuel mixture Y is maintained. It is divided into the flame region R3. The partition member 8 extends vertically in the central portion of the tubular body portion 4 and is spaced apart from the ceiling of the tubular body portion 4. The partition member 8 extends horizontally from the central plate 8 a and the tube. It has a side plate 8 b that is spaced apart from the inner wall of the body part 4. The area of the side plate 8b is set wider than the area seen from above the fuel holding portion 7b. The central plate 8a separates the exhaust gas flow path region R1, the ignition region R2, and the flame holding region R3, and the side plate 8b separates the ignition region R2 and the flame holding region R3.

As shown in FIG. 1, the partition member 8 allows the air-fuel mixture Y to be ventilated from the ignition region R2 to the flame holding region R3 through a through hole 8c formed in the side plate 8b.
Further, as shown in FIG. 1, the partition member 8 allows the exhaust gas X to be ventilated from the exhaust gas flow path region R1 to the ignition region R2 through a gap between the center plate 8a and the ceiling of the tube body part 4.
That is, the partition member 8 divides the exhaust gas flow path region R1, the ignition region R2, and the flame holding region R3 in order to allow ventilation.

  Furthermore, the partition member 8 also includes a through hole 8d for directly supplying a part of the exhaust gas X from the exhaust gas flow path region R1 to the flame holding region R3.

In addition, the partition member 8 includes a flow dividing plate 8e that supplies the fuel injected from the fuel injection device 5 separately to the ignition region R2 and the flame holding region R3.
This flow dividing plate 8e supplies a part of the fuel N injected from the fuel injection device 5 to the flame holding region R3 and supplies it to the flame holding region R3, and is fixed to the end of the side plate 8b and is connected to the ignition device 7 and the fuel injection. It is arranged between the apparatus 5.
Further, the surface of the flow dividing plate 8e is arranged facing the fuel injection device 5, and the fuel N received on the surface is transmitted by the dead weight of the fuel N and supplied to the flame holding region R3 side of the side plate 8b.

Such a partition member 8 ventilates the air-fuel mixture Y from the ignition region R2 to the flame holding region R3 through the through-hole 8c formed in the side plate 8b, so that the flow rate of the air-fuel mixture Y is changed to the flame holding region R3. At a flow rate at which combustion is stabilized.
Further, the partition member 8 supplies the exhaust gas X flowing through the exhaust gas passage region R1 to the ignition region R2 through a gap between the center plate 8a and the ceiling of the tube body part 4.
Further, the partition member 8 supplies a part of the exhaust gas X flowing through the exhaust gas passage region R1 to the flame holding region R3 through the through hole 8d.

  The auxiliary combustion air supply device 9 supplies air to the inside (exhaust gas flow path region R1) of the tube body 4 as needed, and supplies the air, or the air supply device. And piping etc. which connect the inside of the pipe body part 4 are provided.

And the burner apparatus S1 of this embodiment is equipped with the flame holding plate 10 (circulation flow formation means, baffle plate) installed in the supply flow path 1, and the auxiliary ignition device 11 (heating element).
The flame holding plate 10 is made of a heat-resistant plate material, and is provided in the supply channel 1 and on the downstream side of the tubular body portion 4 (where hot gas is generated). It is a baffle plate provided so as to protrude from a part of the inner wall of the supply channel 1 so as to generate R. In the illustrated example, the flame holding plate 10 is provided on the lower wall surface of the supply channel 1. However, if a circulation flow can be generated in the supply channel 1, the upper wall surface or side of the supply channel is provided. You may make it provide in a wall surface.
Then, the flame holding plate 10 is exposed to the flow of the high temperature gas Z in the supply flow path 1 and dams a part of the flow of the high temperature gas Z, thereby forming a circulation flow R on the downstream side.

  The auxiliary ignition device 11 is composed of a glow plug that generates heat when energized. The auxiliary ignition device 11 is disposed downstream of the flame holding plate 10 and in a circulating flow R formed by the flame holding plate 10. The auxiliary ignition device 11 ignites the air-fuel mixture remaining in the high temperature gas Z in the circulation flow R even when the flame is not propagated from the flame holding region R3 to the circulation flow R. It is possible.

In the burner apparatus S1 in the present embodiment configured as described above, the exhaust gas X taken into the exhaust gas passage region R1 from the supply passage 1 is supplied to the ignition region R2.
On the other hand, the ignition device 7 is heated under a control device (not shown), and fuel N is injected from the fuel injection device 5 toward the ignition device 7.

Part of the fuel N injected from the fuel injection device 5 is blocked by the flow dividing plate 8e and supplied to the flame holding region R3, and the remaining fuel N not blocked by the flow dividing plate 8e is supplied to the ignition device 7.
The fuel N supplied to the ignition device 7 is vaporized to become an air-fuel mixture Y, and then further heated to ignite.

When the air-fuel mixture Y is thus ignited in the ignition region R2, the flame generated by the ignition is propagated to the flame holding region R3 together with the unburned air-fuel mixture Y. As a result, the flame F is formed in the flame holding region R3 and flame holding is achieved.
The fuel N transmitted through the flow dividing plate 8e is heated while being transmitted through the side plate 8b of the partition member 8, and is vaporized or atomized to be supplied to the flame holding region R3.
As a result, the fuel N supplied to the flame holding region R3 by the flow dividing plate 8e is burned by the flame F. However, a part of the fuel remains and is contained in the hot gas Z. That is, in the high temperature gas Z, the unburned mixture Y remains.

After the air-fuel mixture Y is ignited, a flame is formed in the ignition region R2 after the air-fuel mixture Y is ignited. For this reason, the air-fuel mixture Y undergoes primary combustion in the ignition region R2 and then secondary combustion in the flame holding region R3.
Even in such a case, the fuel N supplied to the flame holding region R3 by the flow dividing plate 8e is burned by the flame F or remains and is contained in the high temperature gas Z.

  Then, the hot gas Z flows through the supply flow path 1, and a part thereof is blocked by the flame holding plate 10. As a result, a circulation flow R is formed on the downstream side of the flame holding plate 10. Here, when the flame F formed in the flame holding region R3 is propagated to the circulation flow R, the air-fuel mixture Y contained in the hot gas Z continues to be burned while being circulated in the circulation flow R. On the other hand, when the flame F formed in the flame holding region R3 does not propagate to the circulation flow R, the air-fuel mixture Y is again heated to the ignition temperature or higher by the auxiliary ignition device 11 and ignited. Will continue to burn.

According to the burner device S1 of the present embodiment, the flame holding plate 10 that forms the circulation flow R is provided downstream of the location where the high temperature gas Z is generated. When the time becomes long and the remaining amount of fuel remains in the high temperature gas Z, the remaining time can be used for combustion.
Therefore, according to the burner apparatus S1 of this embodiment, it becomes possible to burn more fuel.

  Moreover, in the burner apparatus S1 of this embodiment, the structure which consists of the flame-holding board 10 which is a baffle plate to which the circulation flow formation means of this invention is exposed to the flow of high temperature gas is employ | adopted. For this reason, the circulation flow R can be formed with a simple configuration.

  Further, the burner device S1 of the present embodiment includes an auxiliary ignition device 11 installed in the circulation flow R. For this reason, even if the flame is not propagated from the flame holding region R3 to the circulation flow R, it is possible to ignite again in the circulation flow R.

  Moreover, in the burner apparatus S1 of this embodiment, the glow plug is used as a heat generating body of this invention. Since the glow plug has already been mass-produced in the world and is an inexpensive part, it is possible to suppress an increase in cost caused by installing a heating element in the circulation flow R.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the said embodiment, the structure provided with the auxiliary combustion air supply apparatus 9 was demonstrated. However, the present invention is not limited to this, and the auxiliary combustion air supply device 9 can be omitted when the exhaust gas contains a sufficient concentration of oxygen.

  Further, instead of the flame holding plate 10, a member having another shape may be installed as the circulating flow forming means. Further, when the flame reliably propagates to the circulation flow R, the auxiliary ignition device 11 can be omitted. Furthermore, a plurality of circulating flow forming means may be provided.

  S1 ... Burner device, R1 ... Exhaust gas passage region, R2 ... Ignition region, R3 ... Flame holding region, X ... Exhaust gas (gas fluid), Y ... Air mixture (gas fluid), Z ... ... hot gas (gas fluid), R ... circulating flow, 10 ... flame holding plate (circulating flow forming means), 11 ... auxiliary ignition device (heating element)

Claims (5)

A burner device that is provided in the middle of the flow of a gas fluid and ignites an air-fuel mixture containing fuel and oxygen to generate high-temperature gas,
A burner apparatus comprising circulating flow forming means installed downstream of the location where the high temperature gas is generated to form a circulating flow.   The burner fire device according to claim 1, wherein the circulating flow forming means comprises a baffle plate exposed to the flow of the high-temperature gas.   The burner fire device according to claim 1 or 2, further comprising a heating element installed in the circulating flow formed by the circulating flow forming means.   4. The burner apparatus according to claim 3, wherein the heating element comprises a glow plug.   The burner device according to claim 4, wherein the heating element is arranged on the downstream side of the circulating flow forming means.

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