JPH11324649A - Black smoke removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high heat-resistant black smoke removing device which rises the temperature of exhaust gas for a diesel engine and surely combusts black smoke caught by a filter, when the temperature of the exhaust gas is low. SOLUTION: A black smoke removing device is provided with a filter for catching black smoke in exhaust gas, a fuel-air spray nozzle which can feed fuel and air to the exhaust gas, a catalytic combustion device which can combust the exhaust gas, and a precombustion device 11 which can heat and rise the temperature of the exhaust gas to a prescribed temperature, before the fuel and the air are fed from the spray nozzle, the precombustion device 11 is formed of a double cylinder of an outer cylinder 26 and an inner cylinder 25, a fuel-air spray nozzle 18 for feeding fuel-air mixture and a glow plug 19 for igniting the mixture are provided in the inner cylinder, and the glow plug 19 is fitted to the precombustion device 11 via a cooling jacket 30 having a refrigerant inlet and a refrigerant outlet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing black smoke from exhaust gas discharged from a diesel engine, and more particularly, to a diesel engine such as a route bus or a garbage truck that repeatedly travels and stops. It is effective when applied to cars.

[0002]

2. Description of the Related Art In recent years, it has been confirmed that fine particles (DEP) contained in black smoke generated by incomplete combustion of a diesel engine have a bad influence on human health. Various exhaust purifying devices “diesel particulate filter (DPF) devices” (hereinafter referred to as black smoke removing devices) for reducing exhaust particulates have been developed.

FIG. 8 shows a schematic configuration of a conventional black smoke removing apparatus. As shown in FIG. 8, one end of an exhaust passage 111 that exhausts the exhaust gas 100 is connected to the diesel engine 110. An injector 1 for injecting fuel 101 such as light oil into the exhaust path 111 is provided near the other end of the exhaust path 111.
16 are attached. At the other end of the exhaust path 111,
Mixer 117 for mixing exhaust gas 100 and fuel 101
Are connected at the entrance side. An outlet side of the mixer 117 is connected to an inlet side of a catalytic combustor 118 capable of burning the exhaust gas 100. An outlet side of the catalytic combustor 118 is connected to an inlet side of a honeycomb-shaped ceramic filter 119 that captures black smoke from the exhaust gas 100.

[0004] The diesel engine 110 is provided with various sensors (not shown) for detecting a water temperature, a rotation speed, an exhaust temperature, and the like of the engine 110. On the other hand, at the outlet side of the catalytic combustor 118, various sensors (not shown) for detecting a pressure loss, a combustion temperature, and the like of the exhaust gas at the portion are provided. The detection signals of these various sensors are input to the control device 120. The control device 120 controls the driving of the injector 116 according to the input signal.

In such a black smoke removing apparatus, when the exhaust gas 100 discharged from the diesel engine 110 is fed into the filter 119 via the exhaust path 111, the mixer 117, and the catalytic combustor 118, the filter 119 Captures black smoke from the exhaust gas 100, so that the filter 11
Purified gas 103 from which the black smoke has been removed is discharged from the outlet side of No. 9.

[0006] As the black smoke in the exhaust gas 100 is captured by the filter 119 in this way, the filter 119 is gradually clogged and the engine output is reduced due to an increase in pressure loss. Therefore, the control device 120 controls the injector 116 based on the detection signals from the various sensors, and when the injector 116 appropriately injects a predetermined amount of the fuel 101 into the exhaust path 111, the fuel 101 and the exhaust gas 100 are mixed in a mixer 117 and burned in a catalytic combustor 118. Thus, when the exhaust gas 100 passes through the filter 119, the exhaust gas 100 heats and burns black smoke captured by the filter 119,
Black smoke is removed from the filter 119 to prevent clogging.

[0007]

However, when the above-described black smoke removing device is applied to a diesel engine vehicle which repeatedly runs and stops frequently, such as a route bus or a garbage truck, when the vehicle stops (when the vehicle is idling) The temperature of the exhaust gas 100 in the engine low load region
Since the ignition temperature of the catalyst combustor 118 does not reach the value of 01, the regeneration work of the filter 119 could be performed only during running (in the middle / high load area of the engine). For this reason, depending on the operating condition of the vehicle, the amount of black smoke to be burned at one time is large, the amount of heat generated in the filter 119 is increased, and the temperature of the filter 119 becomes extremely high, and the filter 119 is damaged. There was a problem such as.

Accordingly, the present invention can effectively increase the temperature of the exhaust gas of a diesel engine even when the temperature of the exhaust gas is low, reliably burn the black smoke captured by the filter, and generate heat. An object of the present invention is to provide a highly durable black smoke removing device.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a black smoke removing device according to the present invention comprises a filter for trapping black smoke in exhaust gas from a diesel engine, and a filter for supplying black smoke to the filter. A first nozzle capable of supplying at least fuel to the exhaust gas, a catalyst combustor provided between the first nozzle and the filter, and capable of burning the exhaust gas, and a fuel from the first nozzle. In the black smoke removing device provided with a pre-combustor capable of heating and raising the temperature of the exhaust gas to a predetermined temperature before supplying the pre-combustor,
The outer cylinder into which the exhaust gas is swirled is introduced, and a part of the exhaust gas introduced into the outer cylinder is swirled through a plurality of nozzle holes formed in the peripheral wall, and the inner wall is covered with a heat-resistant material. A second nozzle formed of a double cylinder with the inner cylinder and capable of supplying a mixture of fuel and air into the inner cylinder; and a glow plug for igniting the mixture, and wherein the glow plug is It is characterized in that it is attached to the pre-combustor via a cooling jacket having a refrigerant inlet and a refrigerant outlet.

[0010] Further, a plurality of glow plugs are provided in the cooling jacket, and the cooling jacket has a jacket structure for sequentially circulating and cooling the glow plugs one by one.

The air supplied to the second nozzle as the refrigerant is circulated in the cooling jacket by being diverted,
The glow plug is directly cooled.

Further, fuel supplied to the second nozzle as the refrigerant is circulated in the cooling jacket by being bypassed,
The glow plug is indirectly cooled.

Further, the cooling liquid in the radiator which exchanges heat with the traveling wind as the refrigerant circulates through the cooling jacket to indirectly cool the glow plug.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a black smoke removing apparatus according to the present invention will be described in detail with reference to the drawings using embodiments.

[First Embodiment] [Configuration] FIG. 1 is a schematic configuration diagram of a black smoke removing apparatus showing a first embodiment of the present invention, FIG. 2 is a structural explanatory view of a precombustor, and FIG. It is a detailed sectional view of a plug part.

As shown in FIG. 1, a diesel engine 1
An intake path 3 for sucking fresh air and an exhaust path 4 for discharging exhaust gas are respectively connected to the combustion chamber 2 through valves (not shown), and an injector 5 and a glow as an igniter. A plug 6 is provided. The injector 5 is controlled by the fuel injection control unit 7 to inject pressurized fuel (light oil) from the fuel tank 8 into the combustion chamber 2 at a predetermined injection timing and injection amount, and the glow plug 6 is controlled for starting. When the engine is started, the unit 9 controls the power supply from the battery 10 to generate heat.

The downstream end of the exhaust passage 4 is connected to the inlet side of a precombustor 11 described later. At the outlet side of the pre-combustor 11 is a catalytic combustor 1 using platinum capable of burning exhaust gas.
2, and a honeycomb-shaped ceramic (or non-woven fabric) filter 13 for capturing black smoke from the exhaust gas are sequentially connected along the flow of the exhaust gas. The pre-combustor 11, the catalytic combustor 12, and the filter 13 are integrally formed in a cylindrical shape.

Immediately before the catalytic combustor 12, a fuel / air spray nozzle 14 for catalytic combustion as a first nozzle is provided.
And pressurized air sent from the existing compressor 16 through the flow control valve 17 and mixed into the exhaust gas that has passed through the pre-combustor 11. It can be sprayed.

On the inlet side of the pre-combustor 11, a pre-combustion fuel / air spray nozzle 18 as a second nozzle and a glow plug 19 as an igniter are provided adjacent to the spray nozzle 18. The fuel / air spray nozzle 1
Reference numeral 8 denotes a pressurized fuel sent from the fuel tank 8 via the flow control valve 15 and a feed from the existing compressor 16 via the flow control valve 17, similarly to the fuel / air spray nozzle 14 for catalytic combustion. The pressurized air is mixed and sprayed into the exhaust gas introduced into the pre-combustor 11. The glow plug 19 is energized at a predetermined time from the battery 10 via a relay 20 to generate heat, and can ignite an air-fuel mixture sprayed from the fuel / air spray nozzle 18.

The flow control valves 15 and 17 and the relay 20 are driven and controlled by a signal from a control unit 21 for removing black smoke, and the control unit 21 is provided with an exhaust Detection signals from a thermocouple 22a for detecting gas temperature and a thermocouple 22b interposed in the pre-combustor 11 and detecting the temperature of exhaust gas after pre-combustion are input. The control unit 21 also includes detection signals from various sensors (not shown) that detect the water temperature, the number of revolutions, and the like of the diesel engine 1, and pressure loss and combustion temperature (not shown) of the exhaust gas from the catalytic combustor 12. Detection signals from various sensors are input as appropriate. In FIG. 1, reference numerals 23a and 23b denote fuel pumps for supplying fuel under pressure.

As shown in FIG. 2, the pre-combustor 11 comprises:
One end (upstream side of the exhaust gas flow) is formed of a double cylinder consisting of an inner cylinder 25 and an outer cylinder 26 which are closed, and the downstream end of the exhaust passage 4 is connected to the outer cylinder 26 in a tangential direction. The exhaust gas is swirled and introduced between the outer cylinders 25 and 26 (see arrows in the figure). On the peripheral wall of the inner cylinder 25,
In the same direction as the direction in which the exhaust gas is swirled and introduced between the inner and outer cylinders 25 and 26, nozzle holes 27 for swirling and introducing a part of the exhaust gas are formed equidistantly in the circumferential direction and in the cylinder axis direction. It is formed in multiple.

At the center of the end wall of the inner cylinder 25, the fuel
An air spray nozzle 18 is attached, and the above-mentioned glow plug 19 is attached to the inner end of the fuel / air spray nozzle 18 such that the heat generating portion 19a of the fuel / air sprays out from the fuel / air spray nozzle 18 into the inner cylinder 25. It is attached to the upper end wall of the cylinder 25 obliquely downward. The inner wall of the inner cylinder 25 is covered with a ceramic porous body 28 made of a heat-resistant material. Actually, the ceramic porous body 28 is divided into a plurality of pieces in the cylinder axis direction and is assembled so as to be able to absorb thermal deformation.

The glow plug 19 is connected to the pre-combustor 1 via a cooling jacket 30 as shown in FIG.
1 and the cooling jacket 3
The pressurized air supplied from the compressor 16 to the fuel / air spray nozzle 18 is circulated / bypassed in the fuel / air spray nozzle 18 for cooling.

That is, the cooling jacket 30 has a peripheral gap in the outer cylindrical member 31 fitted in the mounting hole 11a of the pre-combustor 11, and two supporting holes 31a and 31b of the outer cylindrical member 31, respectively. The glow plug 19 is inserted and fixed in the two inner cylinder members 32a and 32b with a circumferential gap at a part of the distal end side in each of the two inner cylinder members 32a and 32b. It is. A refrigerant inlet 33, an intermediate communication port 34, and a refrigerant outlet 35 are provided at an upper portion of the outer cylindrical member 31.
Are formed. A pair of left and right communication holes 36 are formed in the lower portions of the inner cylinder members 32a and 32b, respectively. Also,
A pair of front and rear partition walls 37 are provided in the circumferential gap between the inner cylindrical members 32a and 32b and the outer cylindrical member 31 from the upper end of the circumferential gap.
6 is formed to a height substantially equal to the upper edge of the opening.

Therefore, from the compressor 16 to the refrigerant inlet 3
First, the pressurized air sent to the inside 3 flows from the top to the bottom in the circumferential gap between the inner cylindrical member 32a and the outer cylindrical member 31 in the support hole 31a, and flows through the communication hole 36 on the left into the inner cylindrical member 32a. After flowing from the left to the right in the circumferential gap with the plug 19, the fluid flows from the right through the communication hole 36 in the circumferential gap between the inner cylindrical member 32 a and the outer cylindrical member 31 from the bottom to the top to reach the intermediate communication port 34. Then, pressurized air flowing from the intermediate communication port 34 to the refrigerant outlet 35 in the next support hole 31b in the same manner as in the support hole 31a is supplied to the fuel / air spray nozzle 18.

[Operation / Effect] In such a black smoke removing apparatus, the exhaust gas discharged from the diesel engine 1 is fed into the filter 13 via the exhaust path 4, the pre-combustor 11, and the catalytic combustor 12. Then, since the filter 13 captures black smoke from the exhaust gas, the exhaust gas from which the black smoke has been removed is discharged from the filter 13. In this embodiment,
HC and CO in the exhaust gas are also purified by the catalytic combustor 12.

As described above, the black smoke in the exhaust gas is filtered by the filter 1.
As 3 is captured, the black smoke captured by the filter 13 is accumulated. Then, the control unit 21 for removing black smoke controls the flow control valves 15 and 17 based on the detection signals from the various sensors to pre-combust the mixture of fuel and air from the fuel / air spray nozzle 14 for catalytic combustion. Is sprayed into the exhaust gas passing through the vessel 11.

At this time, when the vehicle is running (middle engine / high load range)
For example, if the temperature of the exhaust gas from the diesel engine 1 has reached the ignition temperature of the air-fuel mixture in the catalytic combustor 12 (about 300 ° or more), the air-fuel mixture and the exhaust gas are burned in the catalytic combustor 12. Is done. Thereby, when the exhaust gas passes through the filter 13, the exhaust gas
The black smoke trapped in the filter 3 is heated and burnt, and the black smoke is removed from the filter 13 to prevent clogging.

On the other hand, when the temperature of the exhaust gas from the diesel engine 1 does not reach the ignition temperature of the mixture in the catalytic combustor 12, for example, when the vehicle is stopped (in a low engine load region such as an idling state), This is detected by the black smoke removal control unit 21 by the thermocouple 22a interposed in the exhaust path 4, and the relay 20 is controlled to energize the glow plug 19, and the flow control valves 15 and 17 are controlled in advance. A mixture of fuel and air is sprayed into the exhaust gas introduced into the pre-combustor 11 from a fuel / air spray nozzle 18 for combustion.

As a result, the air-fuel mixture sprayed from the fuel / air spray nozzle 18 is ignited and burned together with the exhaust gas, and the exhaust gas from the exhaust passage 4 is supplied to the catalyst combustion fuel / air spray nozzle 14 in the catalyst combustor 12. Heat and raise the temperature to the ignition temperature of the air-fuel mixture. As a result, the exhaust gas that has passed through the pre-combustor 11 is burned in the catalytic combustor 12, and when passing through the filter 13, the black smoke captured by the filter 13 is heated and burned, and Removes black smoke from garbage and prevents clogging. In other words, the filter 13 is reproduced.

Therefore, even if the present invention is applied to a diesel vehicle such as a route bus or a garbage truck that repeatedly travels and stops, the regeneration of the filter 13 can be performed even when the vehicle stops (when the engine is in a low load area such as an idling state). Since work can be performed, black smoke captured by the filter 13 can be periodically burned and removed, and the amount of heat generated in the filter 13 is suppressed to a certain value or less to prevent the filter 13 from being damaged. Can be.

In this embodiment, the pre-combustor 11
Is formed as a double cylinder, and the exhaust gas is swirled and introduced between the inner and outer cylinders 25 and 26, and the exhaust gas is also swirled into the inner cylinder 25 by the nozzle holes 27 in the peripheral wall of the inner cylinder 25. Therefore, the exhaust gas in the inner cylinder 25 can be made uniform and the flow rate can be optimized. Two glow plugs 19 are provided and their heat generating portions 19a are attached so as to straddle the spray outer edge of the fuel / air spray nozzle 18 having the optimum fuel concentration distribution. As a result, the glow plug 1
As a result, the ignitability of the exhaust gas flowing through the catalytic combustor 12 can be increased without fail.

By the way, the regeneration of the filter 13 is as follows.
It usually takes about 10 minutes. Therefore, when the pre-combustor 11 is operated during this time, the temperature in the pre-combustor 11 becomes about 1
The temperature of the glow plug 19 rises due to the heat, and a problem arises in heat durability.

However, in the present embodiment, as described above, the glow plug 19 has the cooling jacket 30 and the compressed air supplied from the compressor 16 to the fuel / air spray nozzle 18 is provided in the cooling jacket 30. Circulation·
Since the cooling device is bypassed and cooled, the heat durability is improved, and the durability of the black smoke removing device is also improved.

In the cooling jacket 30, the pressurized air circulates in a vertical direction by the opening positions of the refrigerant inlet 33, the intermediate communication port 34, the refrigerant outlet and the communication hole 36 and the arrangement of the partition wall 37. Therefore, heat can be efficiently exchanged, and the cooling capacity can be increased. The pressurized air that has been efficiently heat-exchanged and thus heated is supplied to the fuel / air spray nozzle 18.
The glow plug 19 also improves the ignitability of the mixture of the fuel and air.

Further, in this embodiment, since the inner wall portion of the inner cylinder 25 is covered with the ceramic porous body 28, the temperature raising property and the heat retaining property are improved. Further, since the fuel and air supplied to the fuel / air spray nozzles 14 and 18 are supplied from the existing fuel tank 8 and the compressor 16, the cost can be reduced.

[Second Embodiment] [Configuration] FIG. 4 is a structural explanatory view of a pre-combustor showing a second embodiment of the present invention, and FIG. 5 is a detailed sectional view of a glow plug portion.

This is because the fuel / air spray nozzle 1 is provided in the cooling jacket 30 of the glow plug 19 in the first embodiment instead of the air from the compressor 16 (see FIG. 1).
This is an example in which the fuel (light oil) from the fuel tack 8 (see FIG. 1) supplied to the fuel 8 is circulated / bypassed to cool the glow plug 19. In this case, glow plug 1
9, the communication holes 36 (see FIG. 3) of the inner cylinder members 32 a and 32 b in the first embodiment are not formed in the cooling jacket 30, and the glow plugs 19 are formed.
Are indirectly cooled by the fuel via the inner cylinder members 32a and 32b. Other configurations are the same as those shown in FIGS.

[Operation and Effect] In this embodiment, not only the regeneration function of the filter 13 but also the thermal durability of the glow plug 19 is improved, and the same operation and effect as in the first embodiment can be obtained.

[Third Embodiment] [Configuration] FIG. 6 is an explanatory view of the structure of a pre-combustor according to a third embodiment of the present invention, and FIG. 7 is a schematic view of the periphery of the radiator.

This is because, instead of air from the compressor 16 (see FIG. 1), the cooling liquid (water) in the radiator 40 is pumped by the pump 41 into the cooling jacket 30 of the glow plug 19 in the first embodiment. This is an example in which the glow plug 19 is circulated to be cooled. In this case, the cooling jacket 30 is configured to be indirectly cooled similarly to the second embodiment. In FIG. 7, reference numeral 42 denotes an electric motor, and reference numeral 43 denotes a fan driven by the electric motor 42. Other configurations are the same as those shown in FIGS.

[Operation and Effect] In this embodiment, not only the regeneration function of the filter 13 but also the thermal durability of the glow plug 19 is improved, and the same operation and effect as in the first embodiment can be obtained.

The present invention is not limited to the above embodiments,
It goes without saying that various changes such as changing the number of glow plugs are possible without departing from the gist of the present invention. In addition, the present invention is not limited to automobiles, and can be applied to railway vehicles and ships equipped with a diesel engine.

[0044]

According to the first aspect of the present invention, there is provided a filter for trapping black smoke in exhaust gas from a diesel engine,
A first nozzle capable of supplying at least fuel to the exhaust gas before being supplied to the filter; and a catalytic combustor provided between the first nozzle and the filter and capable of burning the exhaust gas. A black smoke removing device including a pre-combustor capable of heating and raising the temperature of the exhaust gas to a predetermined temperature before supplying fuel from the first nozzle, wherein the exhaust gas is swirled into the pre-combustor. And a part of the exhaust gas introduced into the outer cylinder is swirled through a plurality of nozzle holes formed in the peripheral wall, and the inner cylinder is covered with a heat-resistant material. A second nozzle capable of supplying a mixture of fuel and air into the inner cylinder, and a glow plug for igniting the mixture, and the glow plug has a refrigerant inlet and a refrigerant outlet. Pre-combustion through a cooled cooling jacket The glow plug is characterized in that the exhaust gas in the pre-combustor can be made uniform and the flow rate can be optimized, the ignitability of the glow plug is improved, and a good combustion state is obtained. Even when the temperature does not reach the ignition temperature of the catalytic combustor, the temperature of the exhaust gas can be increased by the pre-combustor and reliably burned by the catalytic combustor. Therefore, even when applied to diesel vehicles that repeatedly run and stop frequently, such as route buses and garbage trucks, it is possible to perform filter regeneration work even in low load areas such as idling when stopping. it can. Further, since the glow plug is cooled by the refrigerant flowing in the cooling jacket, the heat durability is improved, and the durability of the black smoke removing device is also improved.

According to the second aspect of the present invention, a plurality of glow plugs are provided in the cooling jacket, and the cooling jacket has a jacket structure for sequentially circulating one glow plug for cooling. Therefore, the ignitability of the glow plug is further improved, a good combustion state can be obtained even with low-oxygen-concentration diesel exhaust gas, and the temperature of the exhaust gas flowing into the catalytic combustor can be reliably increased. Further, the plurality of glow plugs are efficiently cooled.

According to the third aspect of the present invention, the air supplied to the second nozzle as the refrigerant is bypassed and circulates in the cooling jacket to directly cool the glow plug. Since the plug is efficiently cooled and the air supplied to the second nozzle is warmed, the ignitability of the glow plug is further improved.

According to the fourth aspect of the invention, the fuel supplied to the second nozzle as the refrigerant is bypassed and circulates in the cooling jacket to indirectly cool the glow plug. Since the plug is efficiently cooled in consideration of rust prevention and the like and the fuel supplied to the second nozzle is warmed, the ignitability of the glow plug is further improved.

According to the fifth aspect of the present invention, the cooling liquid in the radiator that exchanges heat with the traveling wind as the refrigerant circulates through the cooling jacket and indirectly cools the glow plug. Using an inexpensive dedicated radiator or the like, the glow plug is efficiently cooled in consideration of rust prevention and the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a black smoke removing device according to a first embodiment of the present invention.

FIG. 2 is a structural explanatory view of a pre-combustor.

FIG. 3 is a detailed sectional view of the glow plug portion.

FIG. 4 is a structural explanatory view of a pre-combustor showing a second embodiment of the present invention.

FIG. 5 is a detailed sectional view of the glow plug portion.

FIG. 6 is a structural explanatory view of a pre-combustor showing a third embodiment of the present invention.

FIG. 7 is a schematic view of the periphery of the radiator.

FIG. 8 is a schematic configuration diagram of an embodiment of a conventional black smoke removing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diesel engine 3 Intake path 4 Exhaust path 8 Fuel tank 10 Battery 11 Precombustor 12 Catalytic combustor 13 Filter 14 Catalyst combustion fuel / air spray nozzle 15 Flow control valve 16 Compressor 17 Flow control valve 18 Precombustion fuel / air Spray nozzle 19 Glow plug 20 Relay 21 Black smoke removal control unit 22a, 22b Thermocouple 25 Inner tube 26 Outer tube 27 Nozzle hole 28 Ceramic porous body 30 Cooling jacket 31 Outer tube member 32a, 32b Inner tube member 33 Refrigerant inlet 34 Intermediate Communication port 35 Refrigerant outlet 36 Communication hole 37 Partition wall 40 Radiator

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[Procedure amendment]

[Submission date] April 26, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

According to the present invention, there is provided a black smoke removing apparatus comprising: (1) an exhaust passage for exhaust gas of a diesel engine ;
A filter for trapping graphite, and
A catalytic combustor capable of combusting exhaust gas, and
At least fuel can be supplied to the exhaust gas before being supplied.
One nozzle and exhaust before supplying fuel from the first nozzle
A pre-combustor that can heat and raise the gas to a predetermined temperature
In the black smoke removing device sequentially arranged from the side to the upstream side, the pre-combustor has an outer cylinder into which the exhaust gas is swirled and a part of the exhaust gas introduced into the outer cylinder is formed on a peripheral wall portion. A second nozzle, which is formed by a double cylinder with an inner cylinder covered with a heat-resistant material while being swirled and introduced from the plurality of nozzle holes, and capable of supplying a mixture of fuel and air into the inner cylinder. If, when Ru and a glow plug for igniting the mixture gas co
, The plurality of mounting to said precombustor the glow plug through a cooling jacket having a refrigerant inlet and the refrigerant outlet
And the cooling jacket is provided with a refrigerant
Has a jacket structure that circulates and cools each piece one by one.
Characterized in that that.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

(2) In the exhaust passage of the diesel engine,
A filter that captures graphite in exhaust gas
A catalytic combustor capable of combusting exhaust gas before delivery;
At least fuel in the exhaust gas before being sent to the medium combustor
A first nozzle that can be supplied, and fuel is supplied from the first nozzle
Pre-combustion to heat and raise exhaust gas to a predetermined temperature before burning
Black smoke removal device, which is arranged in order from downstream to upstream
In the pre-combustor, the exhaust gas is swirled and introduced.
Outer cylinder and a part of the exhaust gas introduced into the outer cylinder
Swirl through multiple nozzle holes formed in the
The inner wall is formed of a double cylinder with an inner cylinder covered with a heat-resistant material.
And a second mixture that can supply a mixture of fuel and air into the inner cylinder.
A nozzle and a glow plug for igniting the mixture
And the glow plug has a refrigerant inlet and a refrigerant.
The pre-combustor is taken through a cooling jacket with an outlet.
And supplied to the second nozzle as the refrigerant.
Fuel is bypassed and circulated through the cooling jacket,
The glow plug is indirectly cooled .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

(3) In the exhaust passage of the diesel engine,
A filter that captures graphite in exhaust gas
A catalytic combustor capable of combusting exhaust gas before delivery;
At least fuel in the exhaust gas before being sent to the medium combustor
A first nozzle that can be supplied, and fuel is supplied from the first nozzle
Pre-combustion to heat and raise exhaust gas to a predetermined temperature before burning
Black smoke removal device, which is arranged in order from downstream to upstream
In the pre-combustor, the exhaust gas is swirled and introduced.
Outer cylinder and a part of the exhaust gas introduced into the outer cylinder
Swirl through multiple nozzle holes formed in the
The inner wall is formed of a double cylinder with an inner cylinder covered with a heat-resistant material.
And a second mixture that can supply a mixture of fuel and air into the inner cylinder.
A nozzle and a glow plug for igniting the mixture
And the glow plug has a refrigerant inlet and a refrigerant.
The pre-combustor is taken through a cooling jacket with an outlet.
And a heat exchanger that exchanges heat with the traveling wind as the refrigerant.
The coolant in the radiator circulates through the cooling jacket,
The glow plug is indirectly cooled .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

(4) In the above item (2) or (3),
Multiple glow plugs are provided in the cooling jacket
At the same time, the refrigerant circulates one glow plug at a time and cools
It is characterized by having a jacket structure .

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Deleted

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

[0044]

According to the first aspect of the present invention, a filter for capturing graphite in exhaust gas is provided in an exhaust passage of a diesel engine.
Filter and exhaust gas before being sent to the filter.
Catalytic combustor and exhaust gas before delivery to the catalytic combustor
A first nozzle capable of supplying at least fuel therein;
Exhaust gas is heated to a specified temperature before fuel is supplied from the nozzle.
Preheat combustors that can be heated / heated sequentially from downstream to upstream
In the arranged black smoke removing device, the pre-combustor is formed by an outer cylinder into which the exhaust gas is swirled and introduced, and a plurality of nozzle holes formed in a peripheral wall portion of a part of the exhaust gas introduced into the outer cylinder. A second nozzle that is swirled and formed as a double cylinder with an inner cylinder whose inner wall is covered with a heat-resistant material, and that can supply a mixture of fuel and air into the inner cylinder; Rutotomoni a glow plug for igniting said glow plug plurality of attached to the pre-combustor through a cooling jacket having a refrigerant inlet and the refrigerant outlet, and the cooling
In the jacket, refrigerant circulates one by one through the glow plug
It is characterized by having a jacket structure that cools and cools, so that the exhaust gas in the pre-combustor can be made uniform and the flow rate can be optimized, the ignitability by the glow plug is improved, and a good combustion state is obtained. Even when the temperature of the gas does not reach the ignition temperature of the catalyst combustor such as fuel, the temperature of the exhaust gas can be increased by the pre-combustor and reliably burned by the catalyst combustor. Therefore, even when applied to diesel vehicles that repeatedly run and stop frequently, such as route buses and garbage trucks, it is possible to perform filter regeneration work even in low load areas such as idling when stopping. it can. Further, since the glow plug is cooled by the refrigerant flowing in the cooling jacket, the heat durability is improved, and the durability of the black smoke removing device is also improved. In addition, multiple
Glow plugs further improve ignitability and reduce oxygen concentration
Good combustion conditions can be obtained even with diesel exhaust of
The temperature of exhaust gas flowing into the catalytic combustor can be reliably increased
You. On the other hand, multiple glow plugs are efficiently cooled
You.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

According to the second aspect of the invention, the diesel engine
In the exhaust passage of the gin, a filter that captures graphite in the exhaust gas
And combust exhaust gas before being sent to the filter.
In the catalytic combustor and in the exhaust gas before being fed to the catalytic combustor
A first nozzle capable of supplying at least fuel to the first nozzle;
Exhaust gas is heated to a specified temperature before fuel is supplied from the spill
・ Sequentially arrange pre-combustors that can raise the temperature from downstream to upstream.
In the installed black smoke removing device, the pre-combustor is provided with the exhaust gas.
An outer cylinder into which gas is swirled and introduced, and an exhaust gas introduced into the outer cylinder.
Part of the gas is swirled through multiple nozzle holes formed in the peripheral wall.
Inner cylinder that is introduced once and the inner wall is covered with heat-resistant material
And a mixture of fuel and air in the inner cylinder.
A second nozzle capable of supplying air;
Glow plug, and the glow plug
Through a cooling jacket with refrigerant inlet and refrigerant outlet
And attached to the pre-combustor, and
The fuel supplied to the second nozzle is bypassed and the cooling jacket
Circulating through the gut and indirectly cooling the glow plug
Therefore, the same effect as the first aspect of the invention can be obtained.
And the glow plug is highly efficient in consideration of rust prevention
And the fuel supplied to the second nozzle is warmed up.
Glow plugs for better ignitability
Will be up.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

According to the third aspect of the invention, the diesel engine
In the exhaust passage of the gin, a filter that captures graphite in the exhaust gas
And combust exhaust gas before being sent to the filter.
In the catalytic combustor and in the exhaust gas before being fed to the catalytic combustor
A first nozzle capable of supplying at least fuel to the first nozzle;
Exhaust gas is heated to a specified temperature before fuel is supplied from the spill
・ Sequentially arrange pre-combustors that can raise the temperature from downstream to upstream.
In the installed black smoke removing device, the pre-combustor is provided with the exhaust gas.
An outer cylinder into which gas is swirled and introduced, and an exhaust gas introduced into the outer cylinder.
Part of the gas is swirled through multiple nozzle holes formed in the peripheral wall.
Inner cylinder that is introduced once and the inner wall is covered with heat-resistant material
And a mixture of fuel and air in the inner cylinder.
A second nozzle capable of supplying air;
Glow plug, and the glow plug
Through a cooling jacket with refrigerant inlet and refrigerant outlet
Attached to the pre-combustor and runs as the refrigerant
The cooling liquid in the radiator that exchanges heat with
Circulating through the inside of the glow plug to indirectly cool the glow plug.
Because of the feature, the same effect as the invention of claim 1 can be obtained.
And a small and inexpensive dedicated radiator
The low plug is efficiently cooled in consideration of rust prevention and the like.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

According to the fourth aspect, the second or third aspect is provided.
In the invention described in the above item, a plurality of groups are provided in the cooling jacket.
A low plug is provided, and the refrigerant
Have a jacket structure that circulates and cools one by one
Which is the same as the second or third aspect of the present invention.
The effect is obtained, and wearing with multiple glow plugs
Highly flammable diesel exhaust gas with low oxygen concentration
Good combustion condition is obtained and flows into the catalytic combustor
Exhaust gas temperature can be reliably increased. On the other hand,
-The plug is cooled efficiently.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Deleted

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadanori Toyama 3000 Tana, Sagamihara-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd.Sagamihara Works Co., Ltd. Sagamihara Factory

Claims (5)

[Claims] 1. A filter for trapping black smoke in exhaust gas from a diesel engine, a first nozzle capable of supplying at least fuel to the exhaust gas before being sent to the filter, A catalyst combustor provided between the filter and a filter, and capable of heating and increasing the temperature of the exhaust gas to a predetermined temperature before supplying fuel from the first nozzle. In the black smoke removal device provided, the pre-combustor is swirled by an outer cylinder into which the exhaust gas is swirled and introduced and a plurality of nozzle holes formed in a peripheral wall part of the exhaust gas introduced into the outer cylinder. A second nozzle which is formed as a double cylinder with an inner cylinder which is introduced and whose inner wall is covered with a heat-resistant material, and which can supply a mixture of fuel and air into the inner cylinder; and ignites the mixture. And a glow plug for performing The glow plug is attached to the pre-combustor via a cooling jacket having a refrigerant inlet and a refrigerant outlet. 2. The black smoke according to claim 1, wherein a plurality of glow plugs are provided in the cooling jacket, and the cooling smoke has a jacket structure for sequentially circulating the glow plugs one by one to cool. Removal device. 3. The air supplied to the second nozzle as the refrigerant is bypassed and circulates in a cooling jacket to directly cool the glow plug.
Or the black smoke removing device according to 2. 4. The glow plug according to claim 1, wherein the fuel supplied to the second nozzle as the refrigerant is bypassed and circulates in a cooling jacket to indirectly cool the glow plug.
Or the black smoke removing device according to 2. 5. The black smoke removing device according to claim 1, wherein a cooling liquid in a radiator that exchanges heat with traveling wind as the refrigerant circulates through a cooling jacket to indirectly cool the glow plug. .