JP5614115B2 - Burner equipment - Google Patents

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, the fuel injected from the fuel injection device is mixed with exhaust gas or outside air to generate an air-fuel mixture, and the air-fuel mixture is ignited by heating it to an ignition temperature or higher by an ignition device. For this reason, the temperature in the ignition region for igniting the air-fuel mixture needs to be heated to the ignition temperature or higher.
However, since the heat capacity of the casing of the burner device is large, when heating the ignition region using the ignition device, a part of the heat radiated from the ignition device is absorbed by the housing, and the temperature of the ignition region is reduced. It takes time to raise the temperature to the ignition temperature.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to enable ignition in a short time in a burner device.

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

  1st invention is a burner apparatus provided with the casing which equips the inside with the ignition area which ignites with respect to the air-fuel | gaseous mixture containing a fuel and oxygen, Comprising: The said ignition area is enclosed, and the heat dissipation from the said ignition area to the exterior is carried out The structure of providing heat insulation means to prevent is adopted.

  According to a second aspect of the present invention, in the first aspect of the invention, the heat insulating means is an inner liner that is disposed at least partially away from the casing and surrounds the ignition region.

  According to a third invention, in the first invention, the inner liner includes a fuel receiving portion that receives the fuel that adheres to the inner liner and propagates downward.

  According to a fourth aspect, in the third aspect, the fuel receiving section guides the fuel to a region of the casing that is exposed to the high-temperature gas.

  According to a fifth invention, in the first invention, the casing is formed of a casting, the heat insulating means is a surface layer portion on the inner wall side of the casing, and the thermal conductivity is reduced by the porous treatment. A configuration is adopted that consists of the specified areas.

  According to the present invention, heat radiation from the ignition region to the outside is prevented by the heat insulating means. For this reason, it is possible to increase the temperature rise rate in the ignition region and ignite the air-fuel mixture in a short time.

It is a schematic block diagram of the burner apparatus in 1st Embodiment of this invention. It is a schematic block diagram of the burner apparatus in 2nd Embodiment of this invention. It is a schematic block diagram of the burner apparatus in 3rd Embodiment of this invention.

  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.

(First embodiment)
Fig.1 (a) is sectional drawing which shows schematic structure of the burner apparatus S1 of this embodiment.
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 and a fuel holding unit installed at the tip of the glow plug.
Note that the fuel holding portion is composed of a porous body formed of, for example, a wire net, sintered metal, metal fiber, glass cloth, ceramic porous body, ceramic fiber, pumice, or the like.

  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 viewed from above the fuel holding portion. 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. 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.

In the burner device S1 of this embodiment, a casing 10 that forms the outer shape of the burner device S1 is configured by the supply flow path 1 and the tubular body portion 4. The casing 10 is formed of, for example, graphite cast iron together with the partition member 8 and is formed integrally with the partition member 8.
As described above, the partition member 8 is disposed inside the tubular body portion 4, and the ignition region R <b> 2 is formed by the partition member 8. That is, in the burner device S1 of the present embodiment, an ignition region R2 that ignites the air-fuel mixture Y containing fuel and oxygen is formed inside the casing 10.
And the burner apparatus S1 of this embodiment has the container-shaped inner liner 11 (heat insulation means) shown in FIG.1 (b). As shown in FIG. 1B, the inner liner 11 surrounds the ignition region R2 and prevents heat radiation from the ignition region R2 to the outside. The inner liner 11 has an upper end that is open to each of a pair of opposing side walls. 11a, and further has a plurality of openings 11b at the bottom for dispersing and uniforming the air-fuel mixture Y. The inner liner 11 is provided so as to surround the ignition region R2, is fixed to the ceiling of the tube body part 4, the one opening 11a faces the fuel injection device 5, and the other opening 11a faces the exhaust gas passage region R1. It is arranged toward the side.
In such an inner liner 11, the side wall 11 c is provided away from the inner wall of the casing 10, and by forming a gas layer between the side wall 11 c and the casing 10, the amount of heat in the ignition region R <b> 2 is increased. It is hard to be transmitted to.

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.

  And according to the burner apparatus S1 of this embodiment, the inner liner 11 prevents heat radiation from the ignition region R2 to the outside. For this reason, it is possible to increase the temperature increase rate in the ignition region R2 and ignite the air-fuel mixture in a short time.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted or simplified.

Fig.2 (a) is sectional drawing which shows schematic structure of the burner apparatus S2 of this embodiment. FIG. 2B is a perspective view of the inner liner 11A included in the burner device S2 of the present embodiment.
The inner liner 11A included in the burner device S2 of this embodiment is installed in place of the inner liner 11 of the first embodiment, and includes an arm 11d and a fuel receiving portion 11e in addition to the configuration of the inner liner 11. doing.

The arms 11d are for moving the fuel N adhering to the inner liner 11A while moving downward, and a pair of arms 11d are provided facing the front side and the back side of FIG. 2 (a).
The fuel receiving portion 11e receives the fuel N transmitted downward along the arm 11d, and is provided at the lower end of the arm 11d. The position of the fuel receiving portion 11e is set to the same height as the upper wall of the supply flow path 1, and the received fuel N is placed on the flow of the exhaust gas X to the hot gas Z in the supply flow path 1. The fuel N is guided to the exposed high temperature region RA.
And according to the burner device S2 of the present embodiment having such a configuration, it becomes possible to burn more of the fuel N injected from the fuel injection device 5, for example, installed on the downstream side of the burner device S2. It is possible to prevent the fuel N from adhering to the catalyst.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted or simplified.

  FIG. 3 is a cross-sectional view showing a schematic configuration of the burner device S3 of the present embodiment. As shown in this figure, in the burner apparatus S3 of the present embodiment, the surface layer portion 10A (heat insulating means) on the inner wall side of the casing 10 is reduced in thermal conductivity by the porous treatment. Then, heat radiation from the ignition region R2 to the outside is prevented by the surface layer portion 10A.

The casing 10 is formed of graphite cast iron (casting). For this reason, for example, by performing heat treatment for holding the casing 10 in the atmosphere at 1123 K for 24 hours, the carbon of the surface layer portion of the casing 10 is incinerated to be porous, thereby forming the surface layer portion 10A having low thermal conductivity. Can be formed.
As for such a porosification treatment, for example, “Pressurized infiltration treatment of porosification cast iron and measurement of thermal conductivity, Yasufumi Yamaguchi et al., Casting Engineering Vol. 77 (2005) No. 1 , P.26-30 ".

  In the burner device S3 of this embodiment that employs such a configuration, the surface layer portion 10A on the inner wall side of the casing 10 prevents heat radiation from the ignition region R2 to the outside, and the inner liner 11 of the first embodiment is installed. Without increasing the temperature rise rate in the ignition region R2, the air-fuel mixture can be ignited in a short time.

  As described in the first embodiment, since the casing 10 and the partition member 8 are integrally formed of graphite cast iron, by performing heat treatment on the partition member 8 simultaneously with the casing 10, As shown in FIG. 3, the surface layer portion 8 </ b> A of the partition member 8 can also be a region having a low thermal conductivity. As a result, the amount of heat in the ignition region R2 is prevented from being absorbed by the partition member 8, and the temperature rise rate in the ignition region R2 can be further increased, and the air-fuel mixture can be ignited in a short time.

  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.

S1 to S3... Burner device, 1... Supply channel, 4... Pipe body part, 10 .. casing, 10A .. surface layer part (heat insulation means), 11, 11A ... inner liner (heat insulation means), 11e. ... Fuel receiver, RA ... High temperature region, R2 ... Ignition region

Claims (3)

A burner device comprising a casing having an ignition region for igniting an air-fuel mixture containing fuel and oxygen,
Insulating means that surrounds the ignition region and prevents heat dissipation from the ignition region to the outside ,
The heat insulating means is an inner liner that is disposed at least partially away from the casing and surrounds the ignition region,
The burner device characterized in that the inner liner is provided with an opening for taking in the oxygen inside and an opening for taking in the fuel inside .   The burner apparatus according to claim 1, wherein the inner liner includes a fuel receiving portion that receives the fuel attached to the inner liner and transmitted downward. The burner apparatus according to claim 2 , wherein the fuel receiving portion guides the fuel to a region of the casing exposed to the high-temperature gas.

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