JP2002206420A - Exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently eliminate polluting substance included in exhaust gas, and simply process eliminated polluting substance. SOLUTION: This device is provided with a gas introducing port, a gas- holding part connected to the gas inlet port, and having a larger diameter than the inlet port to hold exhaust gas, and a bubble generating part continuously provided with the gas-holding part. Exhaust gas, held in the gas-holding part passes through the bubble generating part, having ventilating performance to be bubbled in liquid on the outer side of the bubble-generating part to be emitted. Exhaust gas passing the bubble-generating part, having ventilating performance to be bubbled in liquid on the outer side of the bubble-generating part to be emitted moves up in the liquid toward a liquid surface, and it is diffused from the liquid surface. Polluting substances contained in the exhaust gas is thus filtered in the liquid by upward movement of 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 apparatus for purifying an exhaust gas by removing pollutants such as a substance which may be included in various exhaust gases and cause a pollution or a substance which may cause the pollution. Further, the present invention relates to a device for removing pollutants contained in exhaust gas from automobile vehicles and other engines and purifying the exhaust gas.

[0002]

2. Description of the Related Art Various devices have been proposed for removing pollutants contained in exhaust gas. For example, with regard to exhaust gas from vehicle engines such as automobiles, a system that uses a catalyst (catalyst system) to remove pollutants in the exhaust gas has a certain effect, but pollutants (nitrogen oxides, sulfur Removal of oxides, hydrocarbons and particulate matter) is not entirely satisfactory. Recently, particulate matter contained in exhaust gas from diesel engines has recently become a problem.

[0003]

SUMMARY OF THE INVENTION The present invention provides an exhaust gas purifying apparatus capable of efficiently removing pollutants based on a completely different idea from the conventional system. Further, the present invention provides an exhaust gas purifying apparatus which can easily treat the removed pollutant.

[0004]

Means adopted by the present invention to solve this problem are as follows. That is,
A gas inlet, a gas holding unit communicating with the gas inlet and holding the exhaust gas expanded from the inlet, and a bubble generating unit connected to the gas holding unit are provided, and the gas holding unit is held in the gas holding unit. The exhaust gas passes through the air-permeable bubble generation unit, and is bubbled into the liquid outside the bubble generation unit and released. Then, the exhaust gas that has passed through the air-permeable bubble generating section, is bubbled into the liquid outside the bubble generating section, and is released, moves upward in the liquid to the liquid surface, and is diffused from the liquid surface. In addition, the bubble generating section functions as a filter for removing pollutants. Further, the gas retaining portion enlarged in diameter from the inlet has a conical shape in which the upper portion is cut out.

A first gas storage chamber for storing exhaust gas sent from an engine or the like, and a first gas storage chamber through a gas inlet.
A gas storage unit communicating with the gas storage chamber; an exhaust gas sent from an engine or the like is stored in the first gas storage room; the pressure of the exhaust gas in the first gas storage chamber is adjusted; The air-permeable bubble generator provided in the liquid in the liquid tank is disposed with the outside facing downward, and the exhaust gas passing through the gas-permeable bubble generator is bubbled downward into the liquid and released. You.

[0006] Further, a second gas storage chamber for storing the exhaust gas radiated from the liquid surface is provided, and a filter section communicating with the second gas storage chamber is provided. And the filter section filters pollutants contained in the exhaust gas.

[0007] Further, a gas-permeable air bubble generator disposed in the liquid in the liquid tank is disposed at a lower stage, a second gas storage chamber is disposed at a middle stage, a filter unit is disposed at an upper stage, and a lower unit is disposed at a lower stage. Exhaust gas that is bubbled and released from the liquid from the located gas-permeable bubble generator moves upward in the liquid and is radiated from the liquid surface, and is stored in the second gas storage chamber located in the middle stage. Is transmitted from the lower side to the upper side. The second gas storage chamber covers the entire upper surface of the plurality of gas storage units arranged in parallel, and a filter unit is provided over the entire upper wall of the second gas storage chamber. Further, the filter portion has at least a two-layer structure composed of different members.

[0008] In the exhaust gas purifying apparatus according to the present invention, the exhaust gas is bubbled into the liquid from the air-permeable bubble generating section and released, and the bubbled exhaust gas moves through the liquid. Due to the movement of the exhaust gas in the liquid, the pollutant contained in the exhaust gas is dissolved in the liquid and filtered. When the bubbled exhaust gas rises to the liquid surface, the bubbled exhaust gas moves upward while oscillating in the liquid, and the harmful substances are easily dissolved in the liquid by this oscillation, and the filtration becomes effective. The bubbles released into the liquid are preferably as small as possible. The bubbled exhaust gas gradually increases in volume and moves upward while oscillating in the liquid. At this time, a large number of small bubbles may combine to form larger bubbles. The pollutants contained in the exhaust gas are more effectively filtered into the liquid by the action or the like.

[0009]

Embodiments of the present invention will be described with reference to the accompanying drawings. The exhaust gas will be described by taking exhaust gas from a vehicle or the like as an example. In the exhaust gas purifying apparatus A, gas discharged from an engine (not shown) is guided to a gas introduction pipe 5 and sent to the first gas storage chamber 1. First
The gas storage chamber 1 stores exhaust gas introduced from an engine or the like, adjusts the pressure of the exhaust gas in the first gas storage chamber 1, and makes the entire gas uniform. The exhaust gas whose pressure has been adjusted is sent to a plurality of gas storage units 2 through a gas inlet 6. A plurality of gas storage units 2 are provided (in the illustrated case,
Five gas storage units 2 are arranged side by side, and a total of 10 gas storage units 2 are provided), and the exhaust gas is stored in the gas storage unit 2. The gas retaining section 2 is enlarged in diameter from the inlet 6 and has a conical shape whose upper part is cut out. The gas storage unit 2 further adjusts the pressure of the temporarily held exhaust gas to make the pressure in the gas storage unit 2 uniform as a whole. The gas retaining section 2 expanded from the inlet 6 is effective for adjusting the pressure of the exhaust gas.

An air bubble generator 9 is connected to the gas storage unit. The exhaust gas retained in the gas retaining unit 2 passes through the gas permeable bubble generating unit 9 and is bubbled from the bubble generating unit 9 into the liquid 10 and released. The bubble generating section 9 is provided in the liquid 10 in the liquid tank, and bubbles are released from the bubble generating section to the liquid 10 in the liquid tank on the outside (the other side). There is no need to dispose the exhaust gas inside the liquid, and any structure may be used as long as the exhaust gas is released at least into the liquid on the outside (the other side) when passing through the air-permeable bubble generating section 9.

The exhaust gas passing through the gas permeable bubble generator 9 is bubbled downward into the liquid 10 and discharged. First, when the exhaust gas is not stored in the gas storage unit 2 (for example, before the start of the engine), the liquid 10 in the liquid tank passes through the gas permeable bubble generating unit 9, and the gas storage unit 2 stores the liquid 10 in the liquid tank. Filled with liquid to the same height as the liquid level. The exhaust gas led from the inlet 6 fills the gas storage unit 2 and the gas storage unit 2
When the pressure becomes equal to or higher than a predetermined value, the liquid in the gas storage unit 2 passes through the gas permeable bubble generation unit 9 and is discharged to the outside. Similarly, the pressure in the gas storage unit 2
The exhaust gas retained in the air passes through the air-permeable bubble generator 9 from inside to outside, and is released as a large number of bubbles into the liquid 10 outside the bubble generator 9.

The bubble generating section 9 provided in the liquid 10 in the liquid tank is disposed with the outside (discharge side) facing downward, and the exhaust gas passing through the gas permeable bubble generating section 9 flows downward into the liquid 10. And released (see arrow in liquid 10 in FIG. 1). As will be described later, the released gaseous exhaust gas moves upward in the liquid 10 in the liquid tank and rises to the liquid level 27, but the gaseous gas discharged below the liquid 10 is discharged as liquid. Since it takes a relatively long time to float on the liquid surface 27 and stays in the liquid for a long time, it is possible to effectively filter the pollutants of the exhaust gas by the liquid 10.

The air permeable bubble generating section 9 can be made of a porous material such as a porous synthetic resin cloth or synthetic resin fiber, such as a sponge. It is desirable that bubbles be as small as possible and release large quantities of approximately the same size. However, the bubble generating section 9 may have any structure as long as the exhaust gas is released into the liquid as bubbles, and for example, the exhaust gas passing through a large number of narrow tubes may be released as bubbles into the liquid (shown in the drawing). Zu).

Since the pressure of the exhaust gas retained in the gas retaining section 2 is adjusted, the exhaust gas is not released from a part of the bubble generating section) or temporarily to the liquid, and almost entirely as a whole. Bubbles of the same size are released stably. The size of the bubble is adjusted by the size of the hole and the like.

The bubble generating section 9 for making the exhaust gas bubbles does not need a filter function, but the bubble generating section 9 may have a filter function for simultaneously removing pollutants. The porous bubble generating section 9 made of a porous material has a filter function, and filters pollutants contained in exhaust gas passing therethrough. In addition, the filtrate adhering to the porous bubble generating portion 9 having a filter function is separated from the bubble generating portion when the exhaust gas is bubbled and released from the bubble generating portion 9, and is separated from the liquid 10 in the liquid tank (the bubble generating portion). (Liquid outside 9). Thereby, the porous bubble generating portion 9 is not clogged,
The filter function is fully exhibited.

The released bubble-like exhaust gas moves through the liquid 10. That is, the bubbled exhaust gas moves upward to the liquid surface 27 of the liquid 10 in the liquid tank, and during the upward movement, the pollutant contained in the exhaust gas dissolves in the liquid and the harmful substance is filtered into the liquid. The liquid may be water, but there is no limitation, and other substances can be added to the liquid.

The exhaust gas radiated from the liquid level 27 rises, and the second exhaust gas provided between the liquid level 27 and the filter unit 7 is increased.
The gas is stored in the gas storage chamber 3. The second gas storage chamber 3 communicates with the filter unit 7. The second gas storage chamber 3 directly communicates with the filter unit 7, that is, the filter unit 7
The exhaust gas provided on the entire upper wall portion 11 of the gas storage chamber 3 and stored in the second gas storage chamber 3 directly communicates with the filter section 7, and the exhaust gas stored in the second gas storage chamber 3 is Immediately passes through the filter section 7. Second gas storage room 3
Communicates indirectly with the filter section 7, that is, a delivery pipe (not shown) is provided between the second gas storage chamber 3 and the filter section 7, and the exhaust gas is delivered to the filter section via the delivery pipe and the like. The light may pass through the section 7 (not shown). In either case, the filter unit 7 filters the pollutants contained in the exhaust gas.

The structure of the filter section 7 is not particularly limited, but is preferably at least a two-layer structure composed of different members. For example, of the two layers, the lower part 12 is made of pulverized pumice and the upper part 13 is made of pulverized charcoal. Usually, when a certain amount of exhaust gas is stored in the second gas storage chamber 3, the filter unit 7 moves the filter unit 7 from the lower side to the upper side (the lower layer unit 12).
From the upper layer 13). Since the exhaust gas passes through the filter unit 7 from the lower side to the upper side, the exhaust gas passes through the filter unit 7 smoothly.

When the exhaust gas radiated from the liquid surface is humidified, the liquid (water) contained in the exhaust gas is filtered when the exhaust gas passes through the filter unit 7.
(Especially the lower part 12) liquefies like condensation. In this case, when liquefied in the form of condensation, the pollutant in the exhaust gas dissolves in the liquid, and the pollutant is easily filtered. That is, in addition to ordinary filtration, filtration of pollutants due to liquefaction in the form of condensation is also possible. Further, when the amount of liquid adhering to the filter 7 due to the dew condensation liquefaction reaches a certain amount, the liquid falls as water droplets and returns to the liquid 10 in the liquid tank. It should be noted that the water droplets that have fallen on the lower surface 15 of the second gas storage chamber 3 also return to the liquid 10 in the liquid tank when the amount of fall has increased. When the filter unit 7 becomes humidified by condensation liquefaction, the humidified filter unit 7 (for example,
The lower layer part 12) filters pollutants which cannot be filtered in the filter section which is not humidified. The filter section may be further multilayered.

Looking at the vertical arrangement of the air-permeable bubble generator 9, the second gas storage chamber 3, and the filter 7, which are the main components of the exhaust gas purifying apparatus A, the lower part shows the liquid in the liquid tank. 10 is provided with an air bubble generator 9, a second stage is provided with a second gas storage chamber 3, and an upper stage is provided with a filter unit 7.
Is provided. Then, the exhaust gas which is bubbled and released from the bubble generation unit 9 located at the lower stage into the liquid in the liquid tank is discharged into the liquid 10.
Ascends inside and is released from the liquid surface. The exhaust gas stored in the second gas storage chamber 3 located in the middle stage passes through the filter unit 7 located in the upper stage from the lower side to the upper side. Since the exhaust gas released as bubbles in the liquid in the liquid tank gradually moves from the lower stage to the upper stage, the exhaust gas, which is a gas, moves smoothly. The exhaust gas that has passed through the filter unit 7 is stored in the third gas storage chamber 16 disposed above the filter unit 7 and is discharged from the discharge pipe 25.

The filtered pollutants settle in the liquid 10 and settle at the bottom 17. Since the filtered pollutant or the like is treated by means of spontaneous precipitation, the treatment of the pollutant is simple. Liquid 10 containing filtered pollutants
Can be disposed of as is, but it is desirable to take measures to collect the polluting substances that settle out at specific locations. That is, the filtered pollutant naturally settles at the bottom 17 of the liquid, and moves to the concentration port 22 by the concentration means having the descending inclined surface 21, so that it is specific. That is, the filtered pollutants are collected at the concentration port 22 where they naturally settle at the bottom 17 of the liquid. In addition, the descending inclined surface 21 which is a concentration means is inclined to one side toward the concentration port 22.

A container 23 is detachably attached to the concentration port 21, and the container 23 stores filtered pollutants. When a certain amount of sediment is stored in the container 23, the container 23 is removed and the internal sediment is disposed (only the sediment in the container and the container containing the sediment can be disposed). Attach container. Container 2
3 is directly or indirectly (eg via a pipe 26)
Removably attached. Container 2 for storing pollutants
3, the pollutants that have been filtered can be easily disposed of.

3 and 4 show an exhaust gas purifying apparatus B having another structure. Parts having the same structure as the exhaust gas purifying apparatus A are denoted by the same reference numerals, and description thereof is omitted. In the exhaust gas purifying apparatus B, an exhaust gas storage chamber 29 having an inlet 6 and a gas permeable air bubble generator 9 connected to the gas storage chamber are provided. The exhaust gas retained in the chamber 29 passes through the air-permeable bubble generating section 9 from one side to the other side, and is bubbled and discharged into the liquid 10 on the other side. 5 is a gas introduction pipe. Multiple tube section 20,
2, a gas-permeable bubble generator 9 is also provided outside the central gas storage chamber 29. Gas storage room 29
The exhaust gas stored in the air bubble passes from the central bubble generating section 9 to the outer bubble generating section 9 and is bubbled into the liquid 10 outside from the bubble generating section 9 to be released. The air-permeable bubble generator 9 on the outside is concentrically disposed in the gas storage chamber 29 at the center. The air-permeable bubble generating section 9 is made of a porous member. The exhaust gas emitted as bubbles is moved upward in the liquid 10, and during this upward movement, pollutants of the exhaust gas are filtered into the liquid. The filtered pollutant is liquid 10 in the liquid tank.
It sinks in and settles on the bottom 17. The precipitated pollutant is settled on the inclined surface 21 from the many through holes 19 of the bottom 17 and collected at the concentration port 22, and stored in the container 23 detachably attached to the concentration port 22. The exhaust gas that has moved up in the liquid 10 is diffused from the liquid surface and is discharged from the gas discharge pipe 25 to the outside.

Although the exhaust gas purifying apparatus A described above can be used alone, other purifying apparatuses of the same type or different types, air bubble generating units, and other filtering means may be appropriately used according to the purpose and application. They can be combined. For example, the exhaust gas purifying device A and the exhaust gas purifying device B can be combined. In the case of FIGS. 5 and 6, the exhaust gas purifying device B is used as the first exhaust gas purifying device, and the exhaust gas purifying device A is used. Is a second exhaust gas purifier, and the gas exhaust pipe of the exhaust gas purifier B and the gas inlet pipe of the exhaust gas purifier A are connected (connected by the connecting pipe 39). In this case, the container 23 containing the precipitated pollutant may be provided in each of the exhaust gas purifying device A and the exhaust gas purifying device B (see FIG. 5), but one container 23 may be used in common. (See FIG. 6).

[0025]

According to the exhaust gas purifying apparatus of the present invention, the pollutants contained in the exhaust gas can be filtered with a liquid, so that not only nitrogen oxides, sulfur oxides, carbon dioxide, but also particulates can be removed. Effective for removing substances. It is particularly effective for removing particulate matter. Also, the treatment of the filtered pollutants is simple. And it can be widely applied to not only vehicle engine exhaust gas but also other exhaust gas containing pollutants, which is extremely useful.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an exhaust gas purifying apparatus according to the present invention.

FIG. 2 is a sectional view taken along line XX of the exhaust gas purifying apparatus of FIG.

FIG. 3 is a partially cutaway front view of another exhaust gas purifying apparatus according to the present invention.

4 is a sectional view taken along line YY of the exhaust gas purifying apparatus of FIG.

FIG. 5 is an explanatory diagram showing a connection state of two exhaust gas purification devices.

FIG. 6 is an explanatory diagram showing another connection state of the two exhaust gas purifying devices.

[Explanation of symbols]

 Reference Signs List A Purification device for exhaust gas B Purification device for exhaust gas 1 First gas storage room 2 Gas storage unit 3 Second gas storage room 5 Gas introduction pipe 6 Inlet 7 Filter unit 9 Bubbles generation unit 10 Liquid 11 Upper wall unit 12 Lower layer Part 13 Upper layer part 15 Lower surface 16 Third gas storage chamber 17 Bottom part 19 Through hole 21 Inclined surface 22 Concentration port 23 Container 25 Gas discharge pipe 26 Pipe 27 Liquid level 29 Gas storage chamber 39 Connecting pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F01N 3/02 301 F-term (Reference) 3G090 AA00 AA01 AA04 EA01 3G091 AA02 AB13 AB15 BA00 BA13 BA14 HA00 4D002 AA02 AA12 BA02 BA04 BA14 CA06 CA07 CA13 DA35 DA41 EA05 EA13 GA03 GB04 4D032 AA03 AA23 AE02 BA06 BB09

Claims (10)

[Claims] 1. A gas inlet, a gas retaining unit that communicates with the gas inlet and holds exhaust gas whose diameter has been expanded from the inlet.
A gas generating unit connected to the gas storing unit, wherein the exhaust gas stored in the gas storing unit passes through the gas permeable bubble generating unit, is bubbled into a liquid outside the bubble generating unit, and is released. Exhaust gas purification device. 2. An exhaust gas that has passed through a gas-permeable air bubble generating section, is bubbled into a liquid outside the air bubble generating section, and is discharged, rises in the liquid to a liquid level, and is radiated from the liquid level. The exhaust gas purifying apparatus according to claim 1. 3. The exhaust gas purifying apparatus according to claim 1, wherein the bubble generating section functions as a filter for removing pollutants. 4. The exhaust gas purifying apparatus according to claim 1, wherein the gas retaining portion enlarged in diameter from the inlet has a conical shape whose upper portion is cut out. 5. A first gas storage chamber for storing exhaust gas sent from an engine or the like, and a gas storage section communicating with the first gas storage chamber via a gas inlet, and the exhaust gas sent from the engine or the like is provided. The exhaust gas purifying apparatus according to claim 1, wherein the exhaust gas is stored in the first gas storage chamber, the pressure of the exhaust gas in the first gas storage chamber is adjusted, and the pressure is sent to the gas storage unit. 6. An air-permeable bubble generator provided in the liquid in the liquid tank is disposed with the outside facing downward, and the exhaust gas passing through the gas-permeable bubble generator is bubbled downward in the liquid. The exhaust gas purifying apparatus according to claim 1, wherein the exhaust gas is purified and discharged. 7. A second gas storage chamber for storing exhaust gas radiated from the liquid surface, and a filter unit communicating with the second gas storage chamber, wherein the exhaust gas stored in the second gas storage chamber is a filter unit. The exhaust gas purifying apparatus according to claim 2, wherein the filter section filters the pollutants contained in the exhaust gas. 8. A gas-permeable air bubble generator disposed in the liquid in the liquid tank is disposed in a lower stage, a second gas storage chamber is disposed in a middle stage, a filter unit is disposed in an upper stage, and a lower part is disposed in a lower stage. Exhaust gas that is bubbled and released from the liquid from the located gas-permeable bubble generator moves upward in the liquid and is radiated from the liquid surface, and is stored in the second gas storage chamber located in the middle stage. The exhaust gas purifying apparatus according to claim 1, wherein the exhaust gas purifies the filter portion located at the upper side from the lower side to the upper side. 9. The filter according to claim 6, wherein the second gas storage chamber covers the entire upper surface of the plurality of gas storage sections arranged in parallel, and a filter section is provided over the entire upper wall of the second gas storage chamber. The exhaust gas purifying apparatus according to the above. 10. The exhaust gas purifying apparatus according to claim 2, wherein the filter section has at least a two-layer structure composed of different members.