JPH09317444A - Exhaust product recovery device for exhaust emission control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the exhaust purifying performance and effectively clean the filters of an exhaust emission control system by constituting a purifying body by two, the first and second purifying chambers made through the splitting of an exhaust pipe in its halfway portion and arranged in parallel to each other and by arranging in the respective purifying chambers injection nozzles which selectively inject fluid to clean the filter SOLUTION: When the engine is running, a fluid force feed part 40 is controlled to force-feed fluid in an fluid tank 24 to a second fluid supply pipe 30-2 for example, which pipe is selected by the switching of a valve 16, and injects the fluid from a second fluid injection nozzle 32-2 toward the filter in a second purifying chamber 8-2 to clean the filter through the removal of products adhering thereto. At which time exhaust gas from the engine flows through a first fluid supply pipe 30-1, thus the fluid is not injected from a first fluid injection nozzle 32-1, and products in the exhaust gas is removed by the filter in a first purifying chamber 8-1. An ozone supply means 44 supplies ozone to oxidize Nox in the exhaust gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust product recovery system for an exhaust gas purification system, and more particularly, it effectively cleans filters provided in the first and second purification chambers by switching valves, and There is no need to stop the exhaust purification system when cleaning the filter, and it is possible to prevent the product from being discharged from the exhaust pipe to the outside air by separating the product from the fluid and cleaning the filter when cleaning the filter. The present invention relates to an exhaust product recovery device for an exhaust purification system.

[0002]

2. Description of the Related Art Engines generally include an ignition and combustion type gasoline engine and a self-ignition type diesel engine. The exhaust system of the engine is equipped with a catalyst for purifying the exhaust and a silencer called a "silencer" or a "muffler" for reducing exhaust noise.

The catalyst includes an oxidation catalyst, a reduction catalyst, a three-way catalyst and the like, and in terms of shape, there are a pellet type (granular type), a monolith type (plate type) and the like.

The oxidation catalyst reduces CO (carbon monoxide) and HC (hydrocarbons) in exhaust gas by utilizing an oxidation phenomenon. Further, the reduction catalyst reduces NOx (nitrogen oxide) in the exhaust gas by reduction. The three-way catalyst reduces the three components of CO, HC and NOx in the exhaust gas.

[0005]

By the way, in recent years, regulations on exhaust gas emitted from vehicles, especially regulations on exhaust gas emitted from vehicles equipped with a diesel engine, tend to be strengthened, and black smoke in exhaust gas is being reinforced. Countermeasures against barrel carbon are being studied.

Therefore, an exhaust purification system has been developed. In this exhaust gas purification system, a purification main body having a filter is disposed in the middle of an exhaust pipe of an engine, and a product in the exhaust gas is removed by a filter in the purification main body.

At this time, when the above-mentioned exhaust gas purification system is used for a long time, the product adheres to the filter to deteriorate the filter function, and the product is heated to remove the adhered product. It is conceivable to take measures such as removing it by air or blowing it off with compressed air.

However, the method of heating and removing the product requires a heat source and has a disadvantage that it is not suitable for practical use because the temperature of the main body of purification is high.

Further, in the method of blowing off with compressed air, by simply blowing off the product adhering to the filter with compressed air, the blown off product is directly discharged into the atmosphere, and is discharged from the vehicle. There is an inconvenience that it does not deal with exhaust gas regulations.

[0010]

In order to eliminate the above-mentioned inconvenience, the present invention provides an exhaust gas purification system for removing products in the exhaust gas by a filter in a purification body which is provided in the middle of an exhaust pipe of an engine. 2 in the middle of the exhaust pipe
The first and second purification chambers arranged in parallel form the purification main body, and first and second fluid injection nozzles for injecting the fluid from the fluid tank are provided in the first and second purification chambers, respectively. A fluid recovery pipe that is provided and communicates with the downstream side of the first and second purification chambers and that communicates with the fluid tank, and a removable filter is provided in the middle of the fluid recovery pipe, and is upstream of the purification body. A valve for switching the flow of exhaust gas into the first and second purification chambers is provided in the middle of the exhaust pipe.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION
When the flow of exhaust gas into the first and second purification chambers is switched by the valve, fluid is ejected from one fluid ejection nozzle into one of the purification chambers, and the fluid cleans the filter, and the other. The exhaust gas flows down into the purification chamber of No. 1 and the fluid is not ejected, and the product in the exhaust gas is removed by the filter, effectively cleaning the filters respectively arranged in the first and second purification chambers. In addition, it is not necessary to stop the exhaust gas purification system when cleaning the filter, and also when the filter is cleaned, the product is separated from the fluid and the product is recovered, and the product is discharged from the exhaust pipe to the outside air. To prevent.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 2 is an exhaust purification system. The exhaust purification system 2 is provided in the middle of an exhaust system from an exhaust port (not shown) of an engine (not shown) such as a diesel engine to an exhaust outlet (not shown) of an exhaust passage 6 formed by an exhaust pipe 4.

The exhaust gas purification system 2 is provided with a purification body 8 in the middle of the exhaust pipe 4. As a result, the exhaust pipe 4 is formed on the upstream side exhaust pipe 4-1 and the downstream side exhaust pipe 4-2 with the purification body 8 interposed therebetween. The purification main body 8 is composed of two first and second purification main bodies 8-1 and 8-2 arranged in parallel.

First and second purification chambers 10-1 and 10-2 are formed in the first and second purification bodies 8-1 and 8-2, respectively.
Filters (not shown) are provided in the first and second purification chambers 10-1 and 10-2, respectively.

Then, the first and second purification chambers 10-1 and 10
-2 is provided with an engine exhaust (not shown) and an introduction pipe 12 for introducing the fluid injected into the exhaust connected thereto. The introduction pipe 12 has one end connected to the upstream exhaust pipe 4-1 and has an intermediate portion branched to divide the first and second introduction branch pipes 14-1 and 14-1.
4-2 is formed, the first introduction branch pipe 14-1 is connected to the first purification chamber 10-1, and the second introduction branch pipe 1 is provided.
4-2 is provided so as to be connected to the second purification chamber 10-2.

First and second introduction branch pipes 14 of the exhaust pipe 4
-1, 14-2 is provided with a valve 16 at a branch portion, and the valve 16 allows the first and second purification chambers 10-1, 10-
2. Switch the flow of exhaust into

Further, the first and second purification bodies 8-1, 8-2
On the other end side in the longitudinal direction of the first and second purification chambers 10-1 and 1
A lead-out pipe 20 including first and second lead-out branch pipes 18-1 and 18-2 is connected and provided so as to lead the exhaust gas 0-2 to the outside. The outlet pipe 20 includes the first and second outlet branch pipes 18 on one end side.
-1, 18-2 are provided, the first and second outlet branch pipes 18-1, 18-2 are joined at an intermediate portion, and the other end side is connected to the downstream exhaust pipe 4-2.

The exhaust purification system 2 has an exhaust product recovery device 22. This exhaust product recovery device 22
Is provided with a fluid tank 24, which stores a fluid injected into the exhaust gas, located below the purification body 8. The fluid tank 24 has a level gauge 26 for detecting the liquid level.
And a sensor 28 for detecting a dirty state of the fluid, one end side of the fluid supply pipe 30 is provided in communication with the other end side of the fluid supply pipe 30, and the first and second fluid supply pipes 30-
1, 30-2 are provided in a branched manner, and the first fluid supply pipe 30-1
Is provided so as to communicate with the first fluid injection nozzle 32-1 arranged in the first purification chamber 10-1 of the first purification body 8-1, and the second fluid supply pipe 30-2 is provided in the second fluid supply pipe 30-2. It is provided so as to communicate with the second fluid injection nozzle 32-2 arranged in the second purification chamber 10-2 of the purification main body 8-2.

The first and second purification bodies 8-of the purification body 8-
Below the 1 and 8-2, the first and second outlet branch pipes 18-
A fluid discharge hole (not shown) is formed in the vicinity of the 1 and 18-2 sides, and a fluid collecting portion (not shown) is attached to the outer peripheral surface portion of the fluid discharge hole so as to cover the fluid discharge hole. The first and second fluid branch recovery pipes 34-
1 and 34-2 are provided so as to communicate with each other, and the other end sides of the first and second fluid branch recovery pipes 34-1 and 34-2 are joined to form a fluid recovery pipe 36, and then the fluid recovery pipe 36 The other end of 36 is provided in communication with the fluid tank 24. A filter 38 is provided in the middle of the fluid recovery pipe 36. The filter 38 incorporates a removable fill element (not shown).

In the middle of the fluid supply pipe 30, there is provided a fluid pressure feed section 40 for feeding the fluid to the first and second fluid injection nozzles 32-1 and 32-2 respectively, and the operation of the fluid pressure feed section 40 is controlled. A control unit 42 is provided.

In the exhaust gas recovery device 22 of the exhaust gas purification system 2, the control unit 42 controls the operation of the fluid pumping unit 40 to suck the fluid in the fluid tank 24 through the fluid supply pipe 30, and the first and second fluids. Supply pipes 30-1, 30-2
To the first and second fluid ejection nozzles 32-1 and 32-
The fuel is injected from No. 2 toward a filter (not shown) in the first and second purification chambers 10-1 and 10-2.

The exhaust product recovery device 22 of the exhaust gas purification system 2 includes the first and second purification chambers 10-1 and 10-1.
-2, the product in the exhaust gas adhering to the filter (not shown) is washed away, and the liquefied fluid is collected from the fluid discharge hole to the fluid collecting portion, and the fluid recovery pipe 36 causes the fluid tank 24
The product contained or mixed in the fluid recovered by spontaneous falling into the fluid is separated and purified by the filter 38, and the fluid purified by the fluid tank 24 is again supplied by the fluid pumping unit 40 to the first and second fluid injection nozzles 32-. It controls so that it may inject into the filter which is not illustrated in the 1st and 2nd purification chambers 10-1 and 10-2 from 1 and 32-2.

The fluid recovery pipe 36 is provided with a fluid suction portion (not shown) for sucking the fluid toward the fluid tank 24 side, so that the fluid can be forcibly recovered in addition to the natural fall. it can.

Further, the exhaust product recovery device 22 includes:
An ozone supply means 44 for supplying ozone to the exhaust gas upstream of the valve 16 is provided. The ozone supply means 44 is
An ozone generator 46 that generates ozone by a high voltage is provided, one end side of an ozone supply pipe 48 is connected to the ozone generator 46, and the other end side of the ozone supply pipe 48 is located upstream of the valve 16. Exhaust passage 6 of the upstream exhaust pipe 4-1
It is provided in contact with the ozone injection nozzle 50 facing the above.

The valve 16 may be of automatic switching type or manual switching type. For example, in the case of the automatic switching system, the valve 16 is provided in communication with the control unit 42, and the usage time of the first and second purification chambers 8-1 and 8-2 and the operating state of the engine (not shown) are set in advance. The switching operation can be automatically performed according to a predetermined condition, and in the case of the manual switching method, a switching lever (not shown) can be provided and the switching can be performed by this switching lever.

The valve 16 is provided in the first purification chamber 8-
When the flow of the exhaust gas to the first purification chamber 8-2 is allowed and the flow of the exhaust gas to the second purification chamber 8-2 is blocked, the product is removed from the exhaust gas in the first purification chamber 8-1 to perform the second purification. In the chamber 8-2, the product attached to the filter is removed, that is, the cleaning with the fluid is performed.

Next, the operation will be described.

In the exhaust product recovery device 22 of the exhaust gas purification system 2, the control unit 42 controls the operation of the fluid pumping unit 40 to determine the fluid in the fluid tank 24 by the switching operation of the valve 16, for example, Explaining with reference to FIG. 1, the valve 16 pressure-feeds the exhaust gas to the second fluid supply pipe 30-2, and the fluid is discharged from the second fluid injection nozzle 32-2 into the second purification chamber 8-2. A filter (not shown) is jetted.

The products (for example, carbon, CO, HC, N, etc.) adhered to the filter in the second purification chamber 8-2 by the fluid ejected from the second fluid ejection nozzle 32-2.
Ox, etc.), that is, cleaning with a fluid is performed. At this time, the product adhered to the filter is contained or mixed in the ejected fluid.

Further, the exhaust product recovery device 22 of the exhaust purification system 2 collects the fluid containing or mixed with the product from the fluid discharge hole to the fluid collecting section, and collects it in the fluid tank 24 by the fluid recovery pipe 36. The product is separated from the fluid to be purified by the filter 38, and the purified fluid in the fluid tank 24 is again supplied by the fluid pumping unit 40 from one of the first and second fluid injection nozzles 32-1 and 32-2. Control to jet.

Further, any one of which is determined by the switching operation of the valve 16, for example, as described with reference to FIG. 1, is not shown in the first fluid supply pipe 30-1 in which exhaust flow is permitted by the valve 16. The exhaust gas from the engine flows down, the fluid is not ejected from the first fluid injection nozzle 32-1, and the exhaust product is removed by the filter (not shown) in the first purification chamber 8-1.

Furthermore, by providing the ozone supply means 44, NOx in the exhaust gas can be oxidized to nitrogen oxides and can be efficiently adhered to the filter together with other products in the exhaust gas. Emissions are being reduced.

When the valve 16 is switched as shown by the broken line in FIG. 1, the first and second purification chambers 8-1, 8 are
The process of -2 is reversed. That is, in the first purification chamber 8-1, removal of products attached to a filter (not shown),
That is, the cleaning with the fluid is performed, and the product of the exhaust is removed by the filter (not shown) in the second purification chamber 8-2.

As a result, the first and second purification chambers 8-
It is possible to effectively clean the filters respectively arranged in 1 and 8-2, and to prolong the service life of the filters,
The cost can be reduced, which is economically advantageous.

The first and second purification chambers 8-1 and 8-
When the filter in one of the two cleaning chambers is cleaned, the filter in the other cleaning chamber removes the product of the exhaust gas, so that it is not necessary to stop the exhaust gas purification system 2 when cleaning the filter, It is practically advantageous.

Further, the first and second purification chambers 8-1 and 8-
When cleaning the filter in one of the two purification chambers,
Filter 3 from the fluid containing or mixing the product
The product can be separated by 8 to recover the product, there is no fear that the product will be discharged from the exhaust pipe 4 to the outside air, and the regulation of the exhaust gas discharged from the vehicle can be dealt with.

[0038]

As described above, the present invention provides an exhaust gas purification system for removing products in the exhaust gas by a filter provided in the purification body provided in the middle of an exhaust pipe of an engine,
The first and second two pipes are branched in the middle of the exhaust pipe and arranged in parallel.
A purification main body is formed by the purification chamber, and first and second fluid injection nozzles for injecting the fluid from the fluid tank are respectively disposed in the first and second purification chambers, and the first and second purification chambers are provided.
A fluid recovery pipe that communicates with the downstream side of the purification chamber and that communicates with the fluid tank is provided, a removable filter is provided in the middle of the fluid recovery pipe, and first and second exhaust pipes upstream of the purification body are provided.
Since the valve for switching the flow of the exhaust gas into the purification chamber is provided, the filters provided in the first and second purification chambers can be effectively cleaned, and the service life of the filter can be lengthened. The cost can be reduced, which is economically advantageous. Further, when the filter in one of the first and second purification chambers is cleaned, the filter in the other cleaning chamber removes the product of exhaust gas,
There is no need to stop the exhaust purification system when cleaning the filter, which is practically advantageous. Furthermore, when cleaning the filter in either one of the first and second purification chambers,
The product can be recovered by separating it from the fluid containing or mixed with the product, and there is no fear that the product will be discharged to the outside air from the exhaust pipe. Can deal with regulations.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an exhaust product recovery system showing an embodiment of the present invention.

[Explanation of symbols]

 2 Exhaust gas purification system 4 Exhaust pipe 4-1 Upstream exhaust pipe 4-2 Downstream exhaust pipe 6 Exhaust passage 8 Purification body 8-1 First purification body 8-1 Second purification body 10-1 First purification chamber 10- 2 2nd purification room 12 Introduction pipe 14-1 1st introduction branch pipe 14-2 2nd introduction branch pipe 16 Valve 18-1 1st derivation branch pipe 18-2 2nd derivation branch pipe 20 Derivation pipe 22 Exhaust product collection Device 24 Fluid tank 26 Level gauge 28 Sensor 30 Fluid supply pipe 30-1 First fluid supply pipe 30-2 Second fluid supply pipe 30-1 First fluid injection nozzle 32-2 Second fluid injection nozzle 34-1 First Fluid branch recovery pipe 34-2 Second fluid branch recovery pipe 36 Fluid recovery pipe 38 Filter 40 Fluid pressure feed unit 42 Control unit 44 Ozone supply means 46 Ozone generator 48 Ozone supply pipe 50 Ozone injection nozzle

Claims (1)

[Claims] 1. An exhaust gas purification system for removing products in exhaust gas by a filter provided in a purification main body provided in the middle of an exhaust pipe of an engine, wherein two exhaust pipes are branched and arranged in parallel. The purification body is formed by first and second purification chambers, and first and second fluid injection nozzles for injecting the fluid from the fluid tank are arranged in the first and second purification chambers, respectively. 2 A fluid recovery pipe that communicates with the downstream side of the purification chamber and that communicates with the fluid tank is provided, a removable filter is provided in the middle of the fluid recovery pipe, and a first filter is provided in the middle of the exhaust pipe upstream of the purification body. An exhaust product recovery device for an exhaust gas purification system, comprising a valve for switching the flow of exhaust gas into the second purification chamber.