JP5417958B2 - Burner equipment - Google Patents

Description

  The present invention relates to a burner device that supplies high-temperature gas to a filter that removes particulates contained in exhaust gas from the exhaust gas.

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, in Patent Document 1, 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 a hot gas, and the hot gas is used as a filter. The fine particles are burned by supplying.

JP 2007-154772 A

By the way, in order to efficiently generate the high temperature gas, it is necessary to maintain a good combustion state of the air-fuel mixture, and it is necessary to adjust the mixing ratio of the exhaust gas and the fuel within a certain limited range.
However, the flow rate of the exhaust gas is much greater than the supply required to generate the required hot gas. For this reason, when an air-fuel mixture having the above-mentioned mixing ratio is generated using exhaust gas supplied in a large amount, a large amount of fuel is required and heat energy more than necessary is generated.

For this reason, the structure for reducing the usage-amount of a fuel in a burner apparatus and suppressing generation | occurrence | production of an unnecessary thermal energy is calculated | required.
Further, considering that the burner device is mounted on a general vehicle or the like, it is necessary to avoid complicated maintenance work and increase in manufacturing cost, and realization of the above-described effect by a simple configuration as much as possible is required.

  The present invention has been made in view of the above-described problems, and in a burner device that supplies high-temperature gas to a filter that removes fine particles, generation of unnecessary heat energy by reducing the amount of fuel used with a simple configuration. It aims at suppressing.

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

  A first invention is a burner device that supplies high temperature gas to a filter that removes particulates contained in exhaust gas from the exhaust gas, the supply passage supplying the exhaust gas to the filter, A combustion section that is connected to a supply flow path and generates the high-temperature gas by mixing and burning the exhaust gas and fuel therein, an exposed area exposed to the supply flow path, and an inside of the combustion section A configuration is adopted in which a plate member having an insertion region to be inserted and a plate member that takes in a part of the exhaust gas flowing through the supply flow path into the combustion section is employed.

  According to a second invention, in the first invention, the plate member separates the inside of the combustion section into an upstream region and a downstream region with respect to the flow of the exhaust gas in the supply flow path, A configuration is adopted in which the distal end portion of the insertion region is separated from the wall surface of the combustion portion.

  According to a third invention, in the first or second invention, a configuration is adopted in which an area of the exposed region of the plate member viewed from the extending direction of the supply flow path is variable.

  According to a fourth invention, in any of the first to third inventions, a configuration is adopted in which turbulent flow generating means for promoting the generation of turbulent flow is formed in the insertion region.

According to the present invention, there is provided a plate member in which a part (exposed region) is disposed in the supply flow path and the other part (insertion region) is inserted into the combustion section connected to the supply flow path. Part of the exhaust gas is supplied by the member to the combustion section that is outside the supply flow path.
Therefore, it is possible to efficiently generate the high temperature gas by using the fuel corresponding to the flow rate of the part of the exhaust gas divided by the plate member. For this reason, compared with the case where a fuel is mixed and burned with respect to the whole quantity of exhaust gas, the usage-amount of a fuel can be reduced and generation | occurrence | production of an unnecessary heat energy can be suppressed.
Further, according to the present invention, for example, a part of the exhaust gas is diverted by a single plate member and supplied to the combustion section. For this reason, the exhaust gas can be divided without adopting a complicated structure.
Therefore, according to the present invention, it is possible to suppress the generation of unnecessary thermal energy by reducing the amount of fuel used with a simple configuration.

It is sectional drawing which shows schematic structure of the burner apparatus in 1st Embodiment of this invention, and is sectional drawing by the surface in alignment with the flow direction of exhaust gas. It is sectional drawing by the surface orthogonal to the cross section of FIG. It is sectional drawing which shows schematic structure of the burner apparatus in 2nd Embodiment of this invention, and is sectional drawing by the surface in alignment with the flow direction of exhaust gas.

  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)
1 and 2 are cross-sectional views showing a schematic configuration of the burner device S1 in the present embodiment. FIG. 1 is a cross-sectional view taken along a plane along the flow direction of the exhaust gas X. FIG. 2 is orthogonal to the cross-section of FIG. It is sectional drawing by the surface to do.

This burner device S1 is connected to an exhaust port of a device that exhausts exhaust gas such as a diesel engine disposed on the upstream side, and generates high-temperature gas Z by mixing and supplying the supplied exhaust gas and fuel for combustion. At the same time, the high-temperature gas Z is supplied to the downstream filter, and is disposed, for example, between the diesel engine and the particulate filter.
And this burner apparatus S1 is provided with the supply flow path 1, the combustion part 2, and the flow dividing plate 3 (plate member).

  The supply flow path 1 is a flow path for supplying exhaust gas X supplied from a device such as a diesel engine directly to a filter, one end of which is connected to an exhaust port of a device such as a diesel engine, The other end is constituted by a cylindrical pipe 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, an injector 5, a cooling device 6, a glow plug 7, a collision plate 8, and an auxiliary combustion air supply unit 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 pipe part 4 is connected with the supply flow path 1 from the direction orthogonal to the extending direction of the supply flow path 1.

Here, the flow dividing plate 3 will be described. The flow dividing plate 3 is a rectangular plate member, and the tip portion on one side is exposed to the supply flow path 1 and the tip portion on the other side is inside the tube portion 4. Has been inserted.
That is, in the burner device S1 of the present embodiment, the flow dividing plate 3 includes an exposed region 3a that is exposed to the supply flow path 1 and an insertion region 3b that is inserted into the combustion unit 2 (tube portion 4). .
The flow dividing plate 3 is fixed to the tube portion 4 by welding or the like, and distributes the exhaust gas X supplied to the supply flow path 1 and supplies a part thereof to the inside of the tube portion 4.

  The size of the exposure area 3 a is defined by the flow dividing ratio required for the flow dividing plate 3. That is, when supplying a flow rate of 50% with respect to the total flow rate of the exhaust gas X supplied to the supply flow path 1 to the inside of the tube part 4, the size of the exposed region 3 a is The area viewed from the extending direction is set to be 50% of the cross-sectional area of the supply channel 1.

In addition, the flow dividing plate 3 is arranged at the center of the tube portion 4 so as to separate the inside of the tube portion 4 into the upstream region R1 and the downstream region R2 in the flow direction of the exhaust gas X flowing through the supply flow path 1. It is arranged in the part. Further, the tip of the flow dividing plate 3 on the tube body part 4 side is separated from the bottom surface (wall surface) of the tube body part 4.
By arranging the flow dividing plate 3 in this manner, the downstream region R2 is arranged in the tube body portion 4 from the upstream region R1 through the gap between the tip of the flow distribution plate 3 and the bottom portion of the tube body portion 4. A flow path is formed.

Further, in the burner device S1 of the present embodiment, the flow dividing plate 3 includes a plurality of through holes 3c (turbulent flow generating means) in the insertion region 3b.
The exhaust gas X is ejected from the upstream region R1 to the downstream region R2 through such a through hole 3c, thereby promoting the generation of turbulence in the downstream region R2.

Returning to the description of the combustion unit 2, the injector 5 injects the fuel Y toward the inside of the tube body part 4, and the injection nozzle is disposed so as to be exposed from the bottom surface of the tube body part 4.
As shown in FIG. 1, the injector 5 is arranged facing the upstream region R1, and is configured to inject fuel Y from the upstream region R1 toward the downstream region R2.

  The cooling device 6 prevents the injector 5 from overheating by cooling the periphery of the injector 5, and a temperature sensor that indirectly measures the temperature of the injector 5, and the injector 5 according to the output of the temperature sensor. Is provided with a coolant supply device or the like for supplying coolant to the surroundings.

  The glow plug 7 is a heater whose tip is heated above the ignition temperature of the mixture of the fuel Y and the exhaust gas X, and is attached to the bottom of the tube portion 4 so that the tip is exposed to the fuel Y injection region. is set up.

The collision plate 8 prevents the fuel Y injected from the injector 5 from adhering to the inner wall surface of the tube body portion 4, and is disposed between the glow plug 7 and the inner wall surface of the tube body portion 4. Yes.
Further, the front end portion of the collision plate 8 is exposed to a combustion region N where an air-fuel mixture of the fuel Y and the exhaust gas X is combusted. Further, the collision plate 8 is formed of a material that is heated to the same temperature as the combustion temperature of the air-fuel mixture when at least the tip is exposed to the combustion region N.

  The auxiliary combustion air supply unit 9 supplies air to the inside of the tube body part 4 supplementarily as needed. The air supply device for supplying air, the inside of the air supply device and the tube body part 4, It is equipped with piping to connect. The auxiliary combustion air supply unit 9 introduces air into the upstream region R <b> 1 of the tube body part 4 as necessary.

Next, the operation in the case of generating the high temperature gas Z and supplying the high temperature gas Z to the downstream filter will be described in the thus configured burner apparatus S1 of the present embodiment.
Note that the burner device S1 of the present embodiment is controlled by a control device (not shown) mounted on a vehicle or the like, and the operations described below are performed under the control of the control device.

First, when the exhaust gas X is supplied to the supply flow path 1 from a device such as a diesel engine, the supplied exhaust gas X collides with the exposed region 3a of the flow dividing plate 3, and a part of the exhaust gas X is divided to be the tube portion 4. Is supplied to the upstream region R1.
The exhaust gas X supplied to the upstream region R1 flows toward the bottom of the tube body portion 4 and is mixed with the air supplied from the auxiliary combustion air supply portion 9 as necessary. It flows into the downstream region R <b> 2 through the space between the bottom portion of the tube portion 4.

The exhaust gas X is mixed with the fuel Y injected from the injector 5 to form an air-fuel mixture, and then ignited by touching the tip of the glow plug 7 and burns in the combustion region N.
Here, in the burner device S <b> 1 of the present embodiment, the collision plate 8 suppresses the fuel Y from adhering to the inner wall surface of the tube body portion 4, and the tip of the collision plate 8 is exposed to the combustion region N. Since it is installed in the vicinity of the combustion region N, the fuel Y adhering to the collision plate 8 can also be combusted. Therefore, efficient combustion can be realized with less fuel.
Furthermore, since the front end portion of the collision plate 8 is exposed to the combustion region N, once combustion starts, the front end portion of the collision plate 8 is heated to a temperature equal to or higher than the ignition temperature of the air-fuel mixture. For this reason, even if heating of the glow plug 7 is stopped, combustion in the combustion region N can be continued, and energy consumption can be reduced.
Further, in the burner apparatus S1 of the present embodiment, a plurality of through holes 3c are formed in the insertion region 3b of the flow dividing plate 3, and the exhaust gas is exhausted directly from the upstream region R1 to the downstream region R2 through the through hole 3c. The gas X is supplied, thereby promoting the generation of turbulence in the downstream region R2. For this reason, in the combustion region N, mixing of the exhaust gas X and the fuel Y is promoted, and more efficient combustion can be realized.

  Then, the hot gas Z is generated by the combustion in the combustion region N, and the hot gas Z is supplied to the filter via the supply flow path 1.

According to the burner device S1 of the present embodiment, a part (exposed region) of the combustion unit 2 in which a part (exposed region) is arranged in the supply channel 1 and another part (insertion region) is connected to the supply channel. A flow dividing plate 3 inserted therein is provided, and the flow dividing plate 3 supplies a part of the exhaust gas X to the combustion section 2 outside the supply flow path 1.
Therefore, the high-temperature gas Z can be efficiently generated by using the fuel Y corresponding to the flow rate of the part of the exhaust gas X branched by the flow dividing plate 3. For this reason, compared with the case where fuel is mixed with the total amount of exhaust gas X and burned, the amount of fuel used can be reduced and generation of unnecessary thermal energy can be suppressed.
Further, according to the burner device S1 of the present embodiment, a part of the exhaust gas X is diverted by the single flow dividing plate 3 and supplied into the combustion section 2. For this reason, the exhaust gas X can be divided without adopting a complicated structure.
Therefore, according to the burner device S1 of the present embodiment, it is possible to reduce the amount of fuel used with a simple configuration and suppress the generation of unnecessary thermal energy.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

FIG. 3 is a cross-sectional view showing a schematic configuration of the burner device S2 of the present embodiment, and FIG. 1 is a cross-sectional view of a plane along the flow direction of the exhaust gas X.
As shown in this figure, in the burner device S2 of the present embodiment, the exposed region 3a and the insertion region 3b of the flow dividing plate 3 are rotatably connected via a hinge portion 3d, and the insertion region 3b is a tube. By being fixed to the body part 4, the exposed region 3a can be tilted in the flow direction of the exhaust gas X with respect to the insertion region 3b.

And the burner apparatus S2 of this embodiment is provided with the drive device 10 for prescribing | regulating the tilting state of the exposure area | region 3a of the flow dividing plate 3. As shown in FIG.
The driving device 10 is connected to the exposed region 3a of the flow dividing plate 3, and changes the tilting state of the exposed region 3a of the flow dividing plate 3 by pushing and pulling the exposed region 3a.
In addition, as such a drive device 10, an air cylinder apparatus etc. can be used, for example.

According to the burner device S2 of the present embodiment having such a configuration, the area of the exposed region 3a viewed from the extending direction of the supply flow path 1 is changed by changing the tilting state of the exposed region 3a by the driving device 10. Can be made variable.
As described above, the area of the exposed region 3 a viewed from the extending direction of the supply flow path 1 affects the flow ratio of the exhaust gas X by the flow dividing plate 3. For this reason, it is possible to change the diversion ratio by the diversion plate 3 by changing the tilting state of the exposure region 3 a by the driving device 10.

  Therefore, according to the burner device S2 of the present embodiment, even when the flow rate of the exhaust gas X supplied from a device such as a diesel engine fluctuates, the exhaust gas X having an optimal flow rate is always supplied to the combustion unit 2. It is possible to generate an air-fuel mixture suitable for generation of the hot gas Z by taking in.

  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 above embodiment, the configuration in which the flow dividing plate 3 is rectangular has been described.
However, the present invention is not limited to this. For example, the exposed region 3 a may be substantially circular according to the cross-sectional shape of the supply flow path 1.

In the above embodiment, the pipe 3 is separated into the upstream region R1 and the downstream region R2 in the flow direction of the exhaust gas X flowing through the supply flow channel 1 in the flow direction of the exhaust gas X. The configuration in which the distal end of the flow dividing plate 3 on the side of the tubular body portion 4 is separated from the bottom surface (wall surface) of the tubular body portion 4 has been described.
However, the present invention is not limited to this, and for example, the flow dividing plate 3 is disposed in contact with the wall surface on the downstream side of the tube portion 4 in the flow direction of the exhaust gas X flowing through the supply flow path 1. It is also possible to adopt a configuration.

Moreover, in the said embodiment, the structure by which the several through-hole 3c was formed in the insertion area | region 3b of the flow dividing plate 3 was demonstrated.
However, the present invention is not limited to this, and it is not always necessary to form the through hole 3c.
Further, instead of the through hole 3c, other turbulent flow generation means (for example, a protruding portion protruding in the downstream region R2) may be formed.

Further, in the second embodiment, in order to make the area of the exposed region 3a seen from the extending direction of the supply flow path 1 variable, a configuration in which the exposed region 3a can be tilted with respect to the insertion region 3b is adopted. .
However, the present invention is not limited to this. For example, the rectangular flow dividing plate 3 shown in the first embodiment can be moved up and down to expose the supply flow channel 1 from the extending direction. A configuration in which the area of the region 3a is variable may be employed.

  S1, S2 ... Burner device, 1 ... Supply flow path, 2 ... Combustion section, 3 ... Diverting plate (plate member), 3a ... Exposed region, 3b ... Insertion region, 3c ... Through hole (turbulence) Flow generation means), 4 ... tube part, X ... exhaust gas, Y ... fuel, Z ... hot gas

Claims (3)

A burner device that supplies a high-temperature gas to a filter that removes particulates contained in the exhaust gas from the exhaust gas,
A supply flow path for supplying the exhaust gas to the filter;
A combustion section that is connected to the supply flow path and generates the high-temperature gas by mixing and burning the exhaust gas and fuel inside;
A plate member that has an exposed area exposed to the supply flow path and an insertion area inserted into the combustion section, and takes in a part of the exhaust gas flowing through the supply flow path into the combustion section ;
With
A burner apparatus characterized in that a plurality of through holes are formed in the insertion region as turbulent flow generating means for promoting generation of turbulent flow .   The plate member separates the inside of the combustion portion into an upstream region and a downstream region with respect to the flow of the exhaust gas in the supply flow path, and a distal end portion of the insertion region is separated from a wall surface of the combustion portion. The burner device according to claim 1, wherein the burner device is provided.   The burner apparatus according to claim 1 or 2, wherein an area of the exposed region of the plate member as viewed from the extending direction of the supply flow path is variable.

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