JP5549915B2 - Burner equipment - Google Patents

Description

  The present invention relates to a burner device that burns an air-fuel mixture of an oxidant and fuel.

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 the burner device, the fuel injected from the fuel injection device is mixed with exhaust gas or outside air supplied as an oxidant to generate an air-fuel mixture, and the air-fuel mixture is heated to an ignition temperature or higher by an ignition device. To burn. And combustion is continued by hold | maintaining the flame produced | generated by the said combustion.
However, if the oxidant supplied to the combustion region has a flow distribution, the combustion state may become unstable.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a burner device that can stabilize the combustion state of an air-fuel mixture and can stably generate high-temperature gas.

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

  1st invention is a burner apparatus which burns the mixture of oxidant and fuel, Comprising: The above-mentioned oxidant intake passage area, the ignition area which ignites the above-mentioned mixture, and the combustion of the above-mentioned mixture are maintained A partition member that divides the flame holding region in order to allow ventilation, and a throttle plate that is installed in the intake flow channel region and equalizes the flow rate distribution of the oxidizing agent in the intake flow channel region. The configuration is adopted.

  According to a second invention, in the first invention, the partition member includes a partition plate that divides the intake flow channel region and the ignition region, and the partition plate widens the ignition region and the intake flow. A configuration in which the road area is curved in a narrowing direction is adopted.

  According to a third invention, in the first or second invention, the partition member is provided with a supply hole for directly supplying the oxidant from the intake flow channel region to the flame holding region, and the diaphragm plate includes the supply plate. A configuration is adopted in which it is installed on the downstream side of the hole.

  According to a fourth invention, in any one of the first to third inventions, the diaphragm plate includes a plurality of through holes.

  According to the present invention, the ignition region and the flame holding region are divided by the partition member so that the air-fuel mixture can be vented. For this reason, it becomes possible to adjust the flow velocity of the air-fuel mixture supplied from the ignition region to the flame holding region. Therefore, the flow rate of the air-fuel mixture supplied to the flame holding region can be adjusted to a flow rate at which combustion is stabilized in the flame holding region.

  Further, according to the present invention, the flow rate distribution of the oxidant flowing through the intake channel region is made uniform by the throttle plate. For this reason, the flow distribution of the oxidant supplied from the intake flow channel region to the ignition region is made uniform. After ignition, since the oxidant is burned also in the ignition region, when the flow distribution of the oxidant supplied to the ignition region is made uniform in this way, the combustion in the ignition region is stabilized.

Thus, according to the present invention, combustion can be stabilized in the flame holding region, and further combustion in the ignition region can be stabilized.
Therefore, according to the present invention, it is possible to stabilize the combustion state of the air-fuel mixture and further stably generate the high temperature gas.

It is sectional drawing which shows schematic structure of the burner apparatus in 1st Embodiment of this invention. It is a top view of the aperture plate with which the burner apparatus in 1st Embodiment of this invention is provided. It is sectional drawing which shows the modification of the burner apparatus in 1st Embodiment of this invention. It is sectional drawing which shows schematic structure of the burner apparatus in 2nd Embodiment of this invention. It is sectional drawing which shows the modification of the burner apparatus 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 is a cross-sectional view showing a schematic configuration of the burner device S1 of the present embodiment.
This burner device S1 is connected to an exhaust port of a device that exhausts exhaust gas such as a diesel engine arranged on the upstream side, and mixes the supplied exhaust gas X (oxidant) and fuel and burns it. This is for generating the gas Z and supplying the high-temperature gas Z 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 and the combustion part 2. FIG.

  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, a fuel supply unit 5, an ignition device 7, a partition member 8, an auxiliary combustion air supply device 9, and a throttle plate 10.

  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. In addition, the horizontal cross-sectional shape of the tube part 4 is a rectangle.

The fuel supply unit 5 includes a fuel holding unit 5a installed at the tip of the ignition device 7, and a supply unit 5b for supplying fuel to the fuel holding unit 5a.
In addition, as the fuel holding | maintenance part 5a, it can form with a metal mesh, a sintered metal, a metal fiber, a glass cloth, a ceramic porous body, a ceramic fiber, a pumice stone etc., for example.

  The ignition device 7 is composed of a glow plug that is a heater that is surrounded by a fuel holding portion 5a and is heated to an ignition temperature of an air-fuel mixture of fuel and exhaust gas X or higher.

  The partition member 8 has an exhaust gas passage region R1 (an oxidizing agent intake passage region) for taking in the exhaust gas X (oxidant) in an amount necessary to obtain a necessary amount of heat inside the tube portion 4. ) And an ignition region R2 where the ignition device 7 is installed, and a flame holding region R3 where combustion of the air-fuel mixture Y is maintained. The partition member 8 extends vertically from the center portion of the tube body portion 4 and is spaced apart from the bottom surface of the tube body portion 4 and extends horizontally from the center plate 8a. And a side plate 8b disposed apart from the side surface of the tubular body portion 4. The area of the side plate 8b is set wider than the area seen from above the fuel holding portion 5a. 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.

As shown in FIG. 1, the partition member 8 allows the air-fuel mixture Y to be ventilated from the ignition region R <b> 2 to the flame holding region R <b> 3 by a gap between the side plate 8 b and the side surface of the tube body part 4.
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 bottom portion of the tube body portion 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.

Further, the partition member 8 has a supply hole 82 for directly supplying the exhaust gas X from the exhaust gas flow channel region R1 to the flame holding region R3.
The supply hole 82 is opened at the most upstream position of the flow in the flame holding region R3. The flow in the flame holding region R3 is the overall flow of the fluid (including the exhaust gas X, the air-fuel mixture, and the combustion gas) in the flame holding region R3. Specifically, the flow in the flame holding region R3 is directed from the connection end of the flame holding region R3 where the gap between the side plate 8b and the side surface of the tube body part 4 is formed to the connection end of the supply flow path 1. Formed.

Such a partition member 8 is disposed so as to form a gap between the tubular body portion 4, and the air-fuel mixture Y is ventilated from the ignition region R2 to the flame-holding region R3 through the gap. The flow rate of the air-fuel mixture Y is adjusted to a flow rate at which combustion is stabilized in the flame holding region R3.
The partition member 8 directly supplies at least a part of the exhaust gas X flowing through the exhaust gas passage region R1 to the flame holding region R3 without supplying it to the ignition region R2 through the supply hole 82. Further, the partition member 8 removes the remaining exhaust gas X, which has not been supplied to the flame holding region R3 via the supply hole 82, from the exhaust gas X flowing through the exhaust gas passage region R1, and the central plate 8a. Is supplied to the ignition region R <b> 2 through a gap with the bottom portion of the gas.

  And in burner device S1 of this embodiment, the lower end part of central board 8a with which partition member 8 is provided is curving in the direction which narrows exhaust gas flow field area R1 while expanding ignition field R2.

The auxiliary combustion air supply device 9 supplementarily supplies air to the inside of the tubular body portion 4 (exhaust gas flow path region R1) as necessary. The air supply device for supplying air and the air supply device And piping etc. which connect the inside of the pipe body part 4 are provided.
The auxiliary air supply device 9 is connected to the upstream side of the diaphragm plate 10 as shown in FIG.

The throttle plate 10 is installed in the exhaust gas passage region R1 and uniformizes the flow rate distribution of the exhaust gas in the exhaust gas passage region R1.
FIG. 2 is a plan view of the diaphragm plate 10. As shown in this figure, the diaphragm plate 10 includes a plurality of circular through holes 10a that are equally arranged, and the flow rate distribution of the exhaust gas X is made uniform by passing the exhaust gas X through the through holes 10a. Turn into.
And in this embodiment, the aperture plate 10 is arrange | positioned in the downstream of the supply hole 82 provided in the center board 8a.

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 flame holding region R3 through the supply hole 82. The remaining portion passes through the diaphragm plate 10 and is supplied to the ignition region R2 after the flow rate distribution is made uniform.
On the other hand, the ignition device 7 is heated under a control device (not shown), and the fuel supplied from the supply unit 5b to the fuel holding unit 5a volatilizes in the ignition region R2.
Then, the exhaust gas X supplied to the ignition region R2 and the volatile fuel are mixed to generate an air-fuel mixture Y, and the air-fuel mixture Y is ignited by being heated to an ignition temperature or higher by the ignition device 7.

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 the exhaust gas X directly supplied to the flame holding region R3 through the supply holes 82 of the partition member 8 in addition to the unburned mixture Y is generated in the flame F. By supplying, the flame F is maintained and flame holding is achieved. And by maintaining such a flame F, the high temperature gas Z is produced | generated stably.
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.

Here, in the burner apparatus S1 of the present embodiment, the ignition region R2 and the flame holding region R3 are divided by the partition member 8 so that the air-fuel mixture Y can be ventilated, and further supplied from the ignition region R2 to the flame holding region R3. The flow rate of the air-fuel mixture Y is adjusted to a flow rate at which combustion is stabilized in the flame holding region R3.
Therefore, according to the burner device S1 of the present embodiment, the combustion state of the air-fuel mixture Y can be stabilized, and further, the hot gas Z can be generated stably.

  Further, according to the burner device S1 of the present embodiment, the flow rate distribution of the exhaust gas X flowing through the exhaust gas passage region R1 is made uniform by the throttle plate 10. For this reason, the flow rate distribution of the exhaust gas X supplied from the exhaust gas passage region R1 to the ignition region R2 is made uniform. As described above, after the ignition, the exhaust gas is combusted also in the ignition region. Therefore, when the flow rate distribution of the exhaust gas X supplied to the ignition region R2 is made uniform in this way, the ignition region. Combustion at R2 is stabilized.

Thus, according to the burner apparatus S1 of this embodiment, combustion can be stabilized in flame holding area | region R3, and also combustion in ignition area | region R2 can be stabilized.
Therefore, according to the burner device S1 of the present embodiment, the combustion state of the air-fuel mixture Y can be stabilized, and further, the hot gas Z can be generated stably.

Further, in the burner device S1 of the present embodiment, the partition member 8 includes a central plate 8a that divides the exhaust gas passage region R1 and the ignition region R2, and the central plate 8a widens the ignition region R2 and exhaust gas flow. It is curved in the direction of narrowing the road region R1.
As a result, the volume of the ignition region R2 increases, and the flow rates of the exhaust gas X and the air-fuel mixture Y in the ignition region R2 decrease. For this reason, it becomes possible to improve the ignitability in the ignition region R2.

Further, in the burner device S1 of the present embodiment, the partition member 8 includes a supply hole 82 for directly supplying the exhaust gas X from the exhaust gas flow path region R1 to the flame holding region R3, and the throttle plate 10 is provided through the supply hole 82. Is also installed downstream.
According to the burner device S1 of this embodiment, the flow rate of the exhaust gas X supplied to the flame holding region R3 through the supply hole 82 can be sufficiently secured, and the high temperature gas Z having a desired temperature can be obtained. Can be obtained.

Moreover, in this embodiment, the structure that the aperture plate 10 is provided with the some circular through-hole 10a arrange | positioned equally is employ | adopted.
According to the burner device S1 of the present embodiment as described above, when the exhaust gas X passes through the throttle plate 10, it is dispersed in the plurality of through holes 10, so that the flow rate distribution of the exhaust gas X can be made uniform. It becomes possible.

  In addition, in this embodiment, the structure provided with the auxiliary combustion air supply apparatus 9 is employ | adopted. However, when the concentration of oxygen contained in the exhaust gas X is sufficiently high, the auxiliary combustion air supply device 9 can be omitted as shown in FIG.

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

FIG. 4A is a cross-sectional view showing a schematic configuration of the burner device S2 of the present embodiment. As shown in this figure, in the burner device S2 of the present embodiment, the tubular body portion 4, its internal structure and connection structure are arranged symmetrically with respect to the burner device S1 of the first embodiment.
That is, in the burner device S2 of the present embodiment, the tube portion 4, its internal structure (partition member 8, fuel supply unit 5, ignition device 7 and throttle plate 10) and connection structure (supporting air supply device 9) It is attached to the upper part of the supply channel 1.

  Also with the burner device S2 of the present embodiment that employs such a configuration, the combustion is stabilized in the flame holding region R3 and further the combustion in the ignition region R2 is stabilized in the same manner as the burner device S1 of the first embodiment. It can be made.

  As shown in FIG. 4B, also in the burner device S2 of the present embodiment, as in the first embodiment, when the oxygen concentration contained in the exhaust gas X is sufficiently high, auxiliary combustion air supply is performed. It is also possible to omit the device 9.

  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, the arrangement position of the throttle plate 10 in the above-described embodiment is an example, and the combustion in the ignition region R2 can be stabilized not a little even if it is provided in any position of the exhaust gas passage region R1. . However, as described above, when there is the supply hole 82 for supplying the exhaust gas X directly from the exhaust gas flow path region R1 to the flame holding region R3, it is preferably provided on the downstream side of the supply hole 82.

Moreover, in the said embodiment, the structure where the through-hole 10a with which the aperture_diaphragm | plate_plate 10 is provided was circular was demonstrated.
However, the present invention is not limited to this, and the shape of the through hole 10a is arbitrary. Moreover, the through-hole 10a does not need to be plural and may be single.
As an example, a configuration in which the diaphragm plate 10 is single and includes a slit-shaped through hole is conceivable.

Moreover, in the said embodiment, the structure which uses the exhaust gas X as an oxidizing agent was demonstrated.
However, the present invention is not limited to this, and air can be used as the oxidant.
In such a case, for example, as shown in FIGS. 5 (a) and 5 (b), the end of the exhaust gas flow path region R 1 connected to the supply flow path 1 is closed, and the auxiliary combustion air supply device 9 In this case, a configuration in which mainly air is sent as an oxidant, not auxiliary, is adopted.

Moreover, in the said embodiment, the structure using the supply part 5b connected to the fuel holding | maintenance part 5a was demonstrated.
However, the present invention is not limited to this, and a supply unit that sprays fuel onto the fuel holding unit 5a may be used.

  S1, S2... Burner device, 8. ), R2 ... ignition region, R3 ... flame holding region, X ... exhaust gas (oxidizer), Y ... mixture, Z ... high temperature gas

Claims (2)

A burner device that burns an air-fuel mixture of an oxidant and a fuel inside a tubular body having one end opened and the other end closed ,
A central plate extending in the extending direction of the tubular body portion at the central portion of the tubular body portion and spaced from the bottom surface on the closed end side of the tubular body portion, and the tubular body portion from the central plate A side plate extending in a direction orthogonal to the extending direction and spaced apart from the side surface of the tubular body portion; and the interior of the tubular body portion is separated from a space on the opposite side of the central plate from the side plate. The oxidant take-in channel region , the ignition region for igniting the air-fuel mixture composed of the space on the bottom surface side of the tubular portion of the side plate, and the space on the side plate opposite to the ignition region A partition member that is divided into a flame-holding region that maintains combustion of the air-fuel mixture;
It comprises a plate member having a plurality of through holes, and is provided in the intake flow channel region and includes a throttle plate that equalizes the flow rate distribution of the oxidant in the intake flow channel region ,
The burner device , wherein the central plate is curved in a direction to widen the ignition region and narrow the intake passage region . The partition member includes a supply hole for directly supplying the oxidant from the intake flow path region to the flame holding region, and the throttle plate is installed on the downstream side of the supply hole. The burner device according to 1 .

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