JP2013189954A - Exhaust treatment device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust treatment device for an engine capable of burning PM stored in a DPF even immediately after an engine start or even during light load operation, or capable of achieving activation of an exhaust purifying catalyst.SOLUTION: If exhaust temperature is lower than a predetermined value and engine rotation speed is less than a predetermined value, on the basis of detection as such by a control means 11, the control means 11 performs low temperature time gas ignition processing, and in the low temperature time gas ignition processing, a combustible gas 2 is generated in a combustible gas generator 1, the combustible gas 2 is ignited by an ignition means 10, and heat of flaming combustion of the combustible gas 2 is supplied to an exhaust passage 4. If exhaust temperature is lower than the predetermined value and the engine rotation speed is the predetermined value or more, on the basis of detection as such by the control means 11, the control means 11 performs low temperature time gas non-generation processing, and in the low temperature time gas non-generation processing, the combustible gas generator 1 is not allowed to generate the combustible gas 2.

Description

  TECHNICAL FIELD The present invention relates to an engine exhaust treatment device, and more particularly, an engine exhaust treatment capable of burning PM accumulated in a DPF immediately after engine startup or during light load operation or activating an exhaust purification catalyst. Relates to the device.

Conventionally, as an exhaust treatment device for an engine, a flammable gas is generated by a flammable gas generator, the flammable gas is discharged from a flammable gas discharge port to an exhaust passage, and the flammable gas is catalytically burned by a combustion catalyst. The temperature of the exhaust gas is raised by the catalytic combustion heat, and PM accumulated in the DPF arranged downstream of the combustion catalyst is burned and removed, or the exhaust purification catalyst arranged downstream of the combustion catalyst is activated. Yes (see, for example, Patent Document 1).
According to this type of exhaust treatment device, there is an advantage that even when the temperature of the exhaust gas is relatively low, the temperature of the exhaust gas can be raised with a combustible gas by catalytic combustion.
However, this conventional technique has a problem because it does not include a combustible gas burning means other than the combustion catalyst.

JP 2007-71034 A (see FIG. 1)

<Problem> Immediately after starting the engine or during light load operation, PM accumulated in the DPF cannot be burned or the exhaust purification catalyst cannot be activated.
Since there is no combustion means for combustible gas other than the combustion catalyst, the catalyst combustion heat of the combustion catalyst is obtained when the exhaust temperature does not reach the activation temperature of the combustion catalyst, such as immediately after engine startup or during light load operation. Therefore, combustion of PM accumulated in the DPF or activation of the exhaust purification catalyst cannot be achieved.

  An object of the present invention is to provide an engine exhaust treatment device capable of burning PM accumulated in a DPF immediately after starting an engine or during light load operation or activating an exhaust purification catalyst.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 2, the combustible gas generator (1) generates the combustible gas (2), and the combustible gas (2) is passed from the combustible gas discharge port (3) to the exhaust passage (4). This combustible gas (2) is catalytically combusted by the combustion catalyst (5), and the exhaust gas (6) is heated by the catalytic combustion heat, and the DPF (7) disposed downstream of the combustion catalyst (5) In the exhaust treatment apparatus for an engine, in which accumulated PM is burned and removed, or an exhaust purification catalyst disposed downstream of the combustion catalyst (5) is activated,
As illustrated in FIG. 2, a combustible gas supply passage (8) is connected to the exhaust passage (4) upstream of the combustion catalyst (5), and an ignition means (10) is connected to the combustible gas supply passage (8). The ignition means (10) is linked to the control means (11),
As illustrated in FIG. 3, when the exhaust gas temperature is less than a predetermined value and the engine rotation speed is less than a predetermined value, the control means (11) detects the low temperature based on the detection by the control means (11). In this low temperature gas ignition process (18), as shown in FIG. 4, the combustible gas generator (1) generates the combustible gas (2) (S9). The ignition means (10) ignites the combustible gas (2), supplies the heat of flame combustion of the combustible gas (2) to the exhaust passage (4) (S10),
As illustrated in FIG. 3, when the exhaust gas temperature is less than a predetermined value and the engine rotation speed is equal to or higher than the predetermined value, the control means (11) detects the low temperature based on the detection by the control means (11). In the low temperature gas non-generation process (19), as shown in FIG. 4, the combustible gas generator (1) does not generate the combustible gas (2). (S11) An exhaust processing apparatus for an engine, characterized in that

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> PM accumulated in the DPF can be burned immediately after the engine is started or during light load operation, or the exhaust purification catalyst can be activated.
As illustrated in FIG. 3, when the exhaust gas temperature is less than a predetermined value and the engine rotation speed is less than a predetermined value, the control means (11) detects the low temperature based on the detection by the control means (11). In this low temperature gas ignition process (18), as shown in FIG. 4, the combustible gas generator (1) generates the combustible gas (2) (S9). The ignition means (10) ignites the combustible gas (2), and the flame combustion heat of the combustible gas (2) is supplied to the exhaust passage (4) (S10). Even when the exhaust temperature does not reach the activation temperature of the combustion catalyst (5) during operation, the temperature of the exhaust (6) is raised by the heat of flame combustion of the combustible gas (2). Can reach the activation temperature of the combustion catalyst (5), and the PM accumulated in the DPF (7) can be burned immediately after starting the engine or during light load operation. It is possible to burn or to activate the exhaust purification catalyst.

<Effect> It is possible to prevent useless generation of the combustible gas at the time of low temperature and high rotation when it becomes difficult to hold the combustion flame of the combustible gas.
As illustrated in FIG. 3, when the exhaust gas temperature is less than a predetermined value and the engine rotation speed is equal to or higher than the predetermined value, the control means (11) detects the low temperature based on the detection by the control means (11). In the low temperature gas non-generation process (19), as shown in FIG. 4, the combustible gas generator (1) does not generate the combustible gas (2). Since (S11) is performed, useless generation of the flammable gas (2) can be prevented at the time of low temperature and high rotation when it is difficult to hold the combustion flame of the flammable gas (2).
Note that it is difficult to hold the combustion flame of the combustible gas (2) at low temperatures and high revolutions because the low temperature exhaust (6) comes in contact with the combustion flame of the combustible gas (2) in large quantities and the heat of the combustion flame. To take away.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The exhaust pressure is not increased.
As illustrated in FIG. 1A, an exhaust passage (4) and a combustible gas supply passage (8) are arranged in parallel, and an exhaust passage (4) and a downstream side of the combustible gas supply passage (8) A heat radiation port (13) is opened at the boundary of the combustible gas supply passage (8), and the heat radiation port (13) communicates the exhaust passage (4) with the combustible gas supply passage (8). ) Is exposed to the ignition means (10) disposed downstream of the combustible gas supply passage (8), so that the exhaust (4) is discharged into the exhaust passage (4) by the combustible gas supply passage (8) or the ignition means (10). The flow of 6) is not disturbed and the exhaust pressure is not increased.

<Effect> The temperature raising efficiency of the exhaust is high.
As illustrated in FIG. 1 (A), since the ignition means (10) disposed on the downstream side of the combustible gas supply passage (8) is exposed to the heat radiating port (13), the combustion of the combustible gas (2) is performed. The exhaust (6) is directly heated by the flame, and the heating efficiency of the exhaust (6) is high.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 2.
<Effect> The temperature raising efficiency of the exhaust gas is further increased.
As illustrated in FIG. 1A, a combustible gas supply passage (8) is provided in parallel below the exhaust passage (4), and a heat radiation port (13) is provided below the peripheral surface of the exhaust passage (4). Because it opened, the hot air of the combustion flame of combustible gas (2) rises to the exhaust passage (4), raises the temperature of the exhaust (6) of the exhaust passage (4), and the temperature rise efficiency of the exhaust (6) becomes more Rise.

(Invention of Claim 4)
The invention according to claim 4 has the following effects in addition to the effects of the inventions according to claims 1 to 3.
<Effect> A high heat radiation amount can be obtained from the combustible gas.
As illustrated in FIG. 1B, combustible gas (2) supplied in the radial direction of the mixing chamber (14) from the combustible gas outlet (17) is mixed with the swirling air (12). The ignition and flame combustion of the gas (2) are promoted, and a high heat radiation amount can be obtained from the combustible gas (2).

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the exhaust-gas treatment apparatus of the diesel engine which concerns on embodiment of this invention, FIG. 1 (A) is a longitudinal cross-sectional view of an exhaust-gas treatment apparatus, FIG.1 (B) is a BB sectional view of FIG. FIG. 1 (C) is a longitudinal sectional view of a modification of the combustible gas nozzle. It is a schematic diagram of the exhaust treatment apparatus of FIG. 1 and its peripheral components. It is explanatory drawing which shows the process area | region by the exhaust-gas treatment apparatus of FIG. 2 is a flowchart of DPF regeneration by the exhaust treatment device of FIG. 1.

  1 to 4 are diagrams for explaining an exhaust treatment device for an engine according to an embodiment of the present invention. In this embodiment, an exhaust treatment device for a diesel engine will be explained.

As shown in FIG. 2, the combustible gas generator (1) generates the combustible gas (2), and the combustible gas (2) is discharged from the combustible gas discharge port (3) to the exhaust passage (4). Then, the combustible gas (2) is catalytically combusted by the combustion catalyst (5), the exhaust gas (6) is heated by the catalytic combustion heat, and accumulated in the DPF (7) disposed downstream of the combustion catalyst (5). PM is burned and removed.
DPF is an abbreviation for diesel particulate filter. PM is an abbreviation for particulate matter.
This combustion catalyst (5) is DOC. DOC is an abbreviation for diesel oxidation catalyst. In order to activate the exhaust purification catalyst (SCR catalyst, NO _X storage catalyst, etc.) disposed downstream of the combustion catalyst (5), together with PM removal of the DPF (7) or instead of PM removal of the DPF (7) It may be. The SCR catalyst is an abbreviation for selective reduction catalyst.

As shown in FIG. 2, a combustible gas supply passage (8) is connected to the exhaust passage (4) upstream of the combustion catalyst (5), and an ignition means (10) is provided in the combustible gas supply passage (8). The ignition means (10) is linked to the control means (11). The ignition means (10) is a glow plug. Reference numeral (42) in the figure is a flame-holding screen in which a large number of holes are formed in the plate material, and suppresses the extinction of the combustion flame by the exhaust gas (4).
When the PM combustion removal start condition is satisfied (when the PM accumulation estimated value reaches the regeneration start value) or when the exhaust purification catalyst activation start condition is satisfied, the control means (11) Performs one of the processes shown in FIG. 3 according to the exhaust temperature and the engine speed.

As shown in FIG. 3, when the exhaust temperature is lower than a predetermined value (specifically, the DOC inlet exhaust temperature is lower than 250 ° C.) and the engine speed is lower than a predetermined value (specifically, lower than 2000 rpm). Based on the detection by the control means (11), the control means (11) executes the low temperature gas ignition process (18). In the low temperature gas ignition process (18), as shown in FIG. In addition, the combustible gas generator (1) generates the combustible gas (2) (S9), the ignition means (10) ignites the combustible gas (2), and the combustible gas (2) is flame-combusted. Is supplied to the exhaust passage (4) (S10).
As a result, even when the exhaust temperature does not reach the activation temperature of the combustion catalyst (5), such as immediately after starting the engine or during light load operation, the exhaust (6) is generated by the heat of flame combustion of the combustible gas (2). The exhaust temperature can reach the activation temperature of the combustion catalyst (5), and the PM accumulated in the DPF (7) can be burned immediately after engine startup or during light load operation, or It is possible to activate the exhaust purification catalyst. 250 ° C. is the activation temperature of the combustion catalyst (5).

As shown in FIG. 2, the control means (11) is provided with a PWM control section (45), and the power supply voltage detection means (46) and the current detection means (47) are linked to the PWM control section (45) to Based on the detection of the value and the current value supplied to the ignition means (10), the PWM control unit (45) sets the duty ratio of the PWM signal for turning on and off the voltage applied to the ignition means (10), and the power supply voltage value Even when the current value fluctuates, the power value supplied to the ignition means (10) is maintained within a predetermined target value range corresponding to the amount of combustible gas (2) generated.
For this reason, even when the power supply voltage fluctuates or when the value of the current applied to the ignition means (10) fluctuates due to the change in resistance of the ignition means (10) due to contact with the combustible gas (2), the ignition means ( The amount of heat generated in 10) can be maintained within a certain range. For this reason, the stability of ignition of the combustible gas (2) can be achieved, and burning of the ignition means (10) due to overcurrent can be prevented. The power source (48) is a battery.

When the combustible gas (2) is ignited, the ignition means (10) is heated for a predetermined time. When the combustion of the combustible gas (2) is started, as long as the combustion flame is held, Therefore, after the predetermined time has elapsed, the heat generation of the ignition means (10) is stopped.
Further, when the air supply means (9) is provided in the combustible gas supply passage (8) and the air supply means (9) is linked to the control means (10) to execute the low temperature gas ignition process (18). Supplies air (12) to the combustible gas (2).

  Further, as shown in FIG. 3, when the exhaust temperature is lower than a predetermined value (specifically, the DOC inlet exhaust temperature is lower than 250 ° C.) and the engine speed is higher than a predetermined value (specifically, 2000 rpm or higher). On the basis of the fact that the control means (11) detects this, the control means (11) executes the low temperature gas non-generation process (19). As shown in FIG. 4, the combustible gas generator (1) does not generate the combustible gas (2). Thereby, useless generation | occurrence | production of combustible gas (2) can be prevented at the time of the low temperature and high rotation at which flame holding of the combustion flame of combustible gas (2) becomes difficult.

  Further, as shown in FIG. 3, when the exhaust temperature is equal to or higher than a predetermined value (specifically, the DOC inlet exhaust temperature is 250 ° C. or higher), this is based on the detection by the control means (11). The control means (11) executes the normal regeneration process (20). In the normal regeneration process (20), as shown in FIG. 4, the combustible gas (2) is generated (S3), and the combustible gas ( (2) Supply to the exhaust passage (4) without igniting (S5).

As shown in FIG. 1 (A), the exhaust passage (4) and the combustible gas supply passage (8) are arranged in parallel, and the exhaust passage (4) and the combustible gas are provided downstream of the combustible gas supply passage (8). A heat radiation port (13) is opened at the boundary of the combustible gas supply passage (8), and the heat radiation port (13) communicates the exhaust passage (4) with the combustible gas supply passage (8). The igniting means (10) arranged on the downstream side of the combustible gas supply passage (8) is faced.
Thereby, the flow of the exhaust (6) in the exhaust passage (4) is not obstructed by the combustible gas supply passage (8) and the ignition means (10), and the exhaust pressure is not increased. Further, the temperature of the exhaust (6) is directly raised by the combustion flame of the combustible gas (2), and the temperature raising efficiency of the exhaust (6) is high.
As shown in FIG. 1 (A), a combustible gas supply passage (8) is arranged in parallel below the exhaust passage (4), and a heat radiation port (13) is opened below the peripheral surface of the exhaust passage (4). ing. Thereby, the hot air of the combustion flame of the combustible gas (2) rises to the exhaust passage (4), raises the temperature of the exhaust (6) in the exhaust passage (4), and increases the temperature raising efficiency of the exhaust (6). .

As shown in FIGS. 1 (A) and 1 (B), a mixing chamber (14) of combustible gas (2) and air (12) is provided along the combustible gas supply passage (8) upstream of the ignition means (10). A combustible gas nozzle (15) and an air supply pipe (16) are provided in the mixing chamber (14), and the combustible gas nozzle (15) is oriented in the direction along which the mixing chamber (14) is formed. ), A plurality of combustible gas outlets (17) are opened on the peripheral surface of the combustible gas nozzle (15), and the air supply pipe (16) is in the circumferential direction of the inner peripheral surface of the mixing chamber (14). The air (12) supplied from the air supply pipe (16) at the time of ignition of the combustible gas (2) and flame combustion by the ignition means (10) Is swung around the inner peripheral surface of the mixing chamber (14) around the combustible gas nozzle (15).
The swirling air (12) is mixed with the combustible gas (2) supplied from the combustible gas outlet (17) in the radial direction of the mixing chamber (14). Thereby, ignition and flame combustion of the combustible gas (2) are promoted, and a high heat radiation amount can be obtained from the combustible gas (2).
As shown in FIG. 1 (C), a flammable gas nozzle (15) is covered with a cap (15a), and a flammable gas outlet (17) is opened in the circumferential direction on the peripheral wall of the cap (15a). The combustible gas (2) discharged from the gas nozzle (15) into the cap (15a) may be supplied from the combustible gas outlet (17) of the cap (15a) in the radial direction of the mixing chamber (14).

  As shown in FIG. 2, when the liquid fuel (26) and the air (25) are supplied to the combustible gas generator (1) and the combustible gas generating catalyst (22) generates the combustible gas (2). When the temperature of the combustible gas generating catalyst (22) is lower than a predetermined temperature (specifically, less than 400 ° C.), the control means (11) uses the air supply means (9) to generate the combustible gas (2). As shown in FIG. 4, the flammable gas (2) is ignited by the igniting means (10) and the heat of the flame combustion of the flammable gas (2) is discharged into the exhaust passage (4 (S10), and the liquid component flowing out from the combustible gas generator (1) is vaporized by the heat of the flame combustion. Thereby, the liquid component which flowed out from the combustible gas generator (1) does not adhere in the exhaust passage (4), and white smoke can be prevented from being generated when the engine is started.

As shown in FIG. 1A, a combustible gas generating catalyst chamber (21) is provided in the combustible gas generator (1), and the combustible gas generating catalyst (22) is provided in the combustible gas generating catalyst chamber (21). An annular wall (23) is arranged at the start end of the combustible gas generating catalyst chamber (21), and an air / fuel mixing chamber (24) is formed inside the annular wall (23). By supplying air (25) and liquid fuel (26) to the chamber (24), an air-fuel mixture gas (27) is formed in the air-fuel mixture chamber (24), and this air-fuel mixture gas (27) is The combustible gas generating catalyst (22) is supplied, and the combustible gas generating catalyst (22) generates the combustible gas (2). Reference numeral (28) in the figure is a lid of the air-fuel mixing chamber (24).
The liquid fuel (26) is light oil, and the combustible gas generation catalyst (22) is an oxidation catalyst.
A part of the liquid fuel (26) is catalytically combusted by the combustible gas generating catalyst (22), and the remaining part of the liquid fuel (26) is vaporized by the catalytic combustion heat to obtain a combustible gas (2).

Control of DPF regeneration is performed as follows.
The engine ECU (31) shown in FIG. 2 includes PM accumulation amount estimation means (32) and PM regeneration control means (33). Engine ECU is an abbreviation for engine electronic control unit.
The PM accumulation amount estimation means (32) is a predetermined calculation unit of the engine ECU (31), and is engine load, engine speed, detected exhaust temperature by the DPF upstream exhaust temperature sensor (34), and DPF upstream exhaust pressure sensor. Based on the exhaust pressure upstream of the DPF (7) by (35), the differential pressure upstream and downstream of the DPF (7) by the differential pressure sensor (36), etc., the PM accumulation amount is calculated from the map data obtained experimentally in advance. presume.

When the PM accumulation amount estimation value reaches a predetermined regeneration start value by the PM accumulation amount estimation means (32), the PM regeneration control means (33) causes the heater (37) to generate heat, and the liquid fuel pump (38) and the blower ( 29) of the motor (30) is driven. As a result, liquid fuel (26) and air (25) are supplied to the air / fuel mixing chamber (24), and as shown in FIG. 1 (A), an air / fuel mixed gas (27) is formed, and a combustible gas is generated. A combustible gas (2) is generated in the catalyst (22). The periphery of the heater (37) is surrounded by an activation catalyst (41) capable of holding liquid fuel, and the heat of the heater (37) is concentratedly supplied to the liquid fuel held by the activation catalyst (41), so that a combustible gas ( The generation of 2) starts immediately.
At the beginning of the start of generation of the combustible gas (2), the heater (37) is heated for a predetermined time. When the generation of the combustible gas (2) is started, the combustible gas generation catalyst (13) generates heat. Since the temperature rises due to the reaction, the heat generation of the heater (37) is stopped by a timer when a predetermined time has elapsed after the generation of the combustible gas (2) is started.

The PM regeneration control means (33) is linked with an inlet side temperature sensor (39) of the combustion catalyst (5), an engine speed sensor (43), and a catalyst temperature sensor (44) of the combustible gas generation catalyst (22). Then, processing corresponding to the processing area shown in FIG. 3 is performed.
The PM regeneration control means (33) is linked with the outlet side temperature sensor (40) of the DPF (7), and when the outlet side temperature of the DPF (7) is abnormally high, the regeneration is stopped urgently.

The flow of DPF regeneration is as follows.
As shown in FIG. 4, it is determined in step (S1) whether the PM accumulation estimated value has reached the regeneration start value. If the determination is affirmative, in step (S2), the exhaust gas on the inlet side of the combustion catalyst (5) is determined. It is determined whether or not the temperature is 250 ° C or higher. If the determination is affirmative, the combustible gas (2) is generated in step (S3), and the temperature of the combustible gas generating catalyst (22) is determined in step (S4). It is determined whether or not the temperature is 400 ° C or higher. If the determination is affirmative, in step (S5), the combustible gas (2) is supplied to the exhaust passage (4) without igniting, and in step (S6), PM It is determined whether or not the estimated accumulation value has reached the regeneration end value. If the determination is affirmative, the combustible gas generation is terminated in step (S7), and the regeneration of the DPF is terminated.
If the determination in step (S6) is negative, the process returns to step (S2).
If the determination in step (S2) is negative, it is determined in step (S8) whether or not the engine speed is less than 2000 rpm. If the determination is affirmative, combustible gas (2) is determined in step (S9). In step (S10), the combustible gas (2) is ignited, the heat of flame combustion is supplied to the exhaust passage (4), and the process proceeds to step (S6). Even when the determination in step (S4) is negative, the process proceeds to step (S10).
If the determination in step (S8) is negative, no combustible gas is generated in step (S11), and the process returns to step (S2).

(1) Combustible gas generator
(2) Combustible gas
(3) Combustible gas outlet
(4) Exhaust passage
(5) Combustion catalyst
(6) Exhaust
(7) DPF
(8) Flammable gas supply passage
(10) Ignition means
(11) Control means
(12) Air
(13) Heat radiation port
(14) Mixing chamber
(15) Combustible gas nozzle
(16) Air supply pipe
(17) Combustible gas outlet
(18) Gas ignition treatment at low temperature
(19) Low temperature gas non-generation treatment

Claims (4)

The combustible gas generator (1) generates the combustible gas (2), the combustible gas (2) is discharged from the combustible gas discharge port (3) to the exhaust passage (4), and the combustible gas ( 2) catalytic combustion with the combustion catalyst (5), the exhaust gas (6) is heated with the catalytic combustion heat, and PM accumulated in the DPF (7) disposed downstream of the combustion catalyst (5) is burned and removed. Alternatively, in an engine exhaust treatment device that activates an exhaust purification catalyst disposed downstream of the combustion catalyst (5),
A combustible gas supply passage (8) is connected to the exhaust passage (4) upstream of the combustion catalyst (5), and an ignition means (10) is provided in the combustible gas supply passage (8). The ignition means (10) Is linked to the control means (11),
When the exhaust temperature is less than the predetermined value and the engine speed is less than the predetermined value, the control means (11) performs the low temperature gas ignition process (18) based on the detection by the control means (11). In this low temperature gas ignition process (18), the combustible gas generator (1) generates the combustible gas (2) (S9), and the ignition means (10) ignites the combustible gas (2). Then, the heat of flame combustion of the combustible gas (2) is supplied to the exhaust passage (4) (S10),
When the exhaust gas temperature is less than the predetermined value and the engine speed is equal to or higher than the predetermined value, the control means (11) detects the low temperature gas non-generation process (19) based on the detection by the control means (11). In the low temperature gas non-generation process (19), the combustible gas generator (1) does not generate the combustible gas (2) (S11), and the engine exhaust process is characterized in that apparatus. The engine exhaust treatment apparatus according to claim 1,
The exhaust passage (4) and the combustible gas supply passage (8) are arranged side by side, and at the boundary between the exhaust passage (4) and the combustible gas supply passage (8) on the downstream side of the combustible gas supply passage (8). The heat release port (13) is opened, the exhaust passage (4) and the combustible gas supply passage (8) are communicated with each other through the heat release port (13), and the combustible gas supply passage (8) is connected to the heat release port (13). An exhaust treatment apparatus for an engine, characterized in that an ignition means (10) disposed on the downstream side is faced. The engine exhaust treatment apparatus according to claim 2,
Exhaust gas from an engine, characterized in that a combustible gas supply passage (8) is provided in parallel below the exhaust passage (4), and a heat radiation port (13) is opened below the peripheral surface of the exhaust passage (4). Processing equipment. The engine exhaust treatment apparatus according to any one of claims 1 to 3,
A combustible gas (2) and air (12) mixing chamber (14) is formed upstream of the ignition means (10) along the combustible gas supply passage (8), and a combustible gas nozzle is formed in the mixing chamber (14). (15) and an air supply pipe (16) are provided, and the combustible gas nozzle (15) is disposed in the center of the mixing chamber (14) in a direction along the forming direction of the mixing chamber (14), and this combustible gas nozzle ( 15) A plurality of combustible gas outlets (17) are opened on the peripheral surface of the mixing chamber (14), and the air supply pipe (16) is oriented along the circumferential direction of the inner peripheral surface of the mixing chamber (14). The air (12) supplied from the air supply pipe (16) is mixed around the combustible gas nozzle (15) at the time of ignition of the combustible gas (2) by the ignition means (10) and flame combustion. 14) swivel along the inner peripheral surface,
An exhaust treatment apparatus for an engine, characterized in that the swirling air (12) is mixed with the combustible gas (2) supplied from the combustible gas outlet (17) in the radial direction of the mixing chamber (14).

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