JPH0610121Y2 - Device for collecting and processing unburned matter in exhaust gas - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to diesel and other automobile engines, kerosene,
The present invention relates to a device for collecting and processing unburned components in exhaust gas from gas heaters, heavy oil, gas combustion furnaces, coal-fired boiler furnaces, and the like.

[Conventional technology]

A porous combustion medium made of ceramics, etc. is placed in the exhaust gas passage to capture unburned carbonaceous solid unburned components called soot, mist, etc. in the exhaust gas, and then unburned components in the exhaust gas to be burned. The collection processing device of the above has been applied for a patent by the present applicant with a patent application No. 261797 in 1987. In this device, there are a type in which the entire exhaust gas passes through the pores of the porous combustion medium, and a type in which the porous combustion medium is arranged in a staggered manner in the exhaust gas passage.

[Problems to be solved by the device]

(1) Among the above-mentioned devices, in the type in which the entire exhaust gas passes through the pores of the combustion medium, the solid unburned components that are captured by the porous combustion medium are blown out together with the passage of the exhaust gas. . Therefore, the capture rate of unburned components is reduced, and some of the solid unburned components are discharged as they are.

(2) In the type in which the combustion medium is staggered in the exhaust gas passage, part of the solid unburned matter in the exhaust gas is flowed along the stream line of the exhaust gas without ever contacting the porous combustion medium. However, some of them will be blown out, and the capture rate of unburned components will decrease as in the previous section, and some will be discharged as solid unburned components.

In view of such a point, the present invention intends to provide an unburned-mass trapping treatment apparatus that improves the capture rate of unburned-gas in exhaust gas and discharges exhaust gas that does not contain unburned-gas. It is a thing.

[Means for Solving the Problems]

The present invention is a device for collecting and processing unburned matter in exhaust gas, which is provided with a porous combustion medium provided in an exhaust gas passage, and is provided with a plurality of such devices so as to change the flow direction of the exhaust gas of the porous combustion medium. The back of the gas flow facing surface of the porous combustion medium was closed.

[Action]

In the present invention, the flow of the exhaust gas is converted by the plurality of porous combustion media, in which the solid unburned matter in the exhaust gas is deviated from the flow of the exhaust gas by the inertial force thereof and collected in the pores of the combustion medium. In this way, the flow rate of the exhaust gas is converted by the plurality of porous combustion media and collected in the combustion media, so that the capture rate of the solid unburned components is improved. The solid unburned matter collected in the porous combustion medium is burned over time by oxygen in the exhaust gas or oxygen supplied separately and heat of the exhaust gas or heat supplied separately.

In addition, since the back surface of the surface of the porous combustion medium that faces the exhaust gas flow is blocked, solid unburned matter does not blow through the combustion medium, and the collected unburned matter is retained in the combustion medium. Burned.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. Reference numeral 1 denotes an unburned-mass-collection-processing-apparatus main body having an inlet-side connecting flange 2 and an outlet-side connecting flange 3 which has a tubular shape with a rectangular cross section into which exhaust gas G1 from an engine or a boiler combustion furnace flows, A plurality of comb-teeth-shaped porous combustion media 4 that extend downward and are arranged at intervals.
a, 4c, 4e and the porous combustion medium 4a, 4c, 4 opposite to this
Combustion media 4b, 4d, 4f are provided that are shifted to the downstream side of the exhaust gas G1 by half the distance e and extend upward from the lower wall of the main body 1. The combustion medium 4a, 4c, 4e and the lower wall of the main body, the combustion medium
A space is provided between each of 4b, 4d, 4f and the upper wall of the main body. Porous combustion media 5a, 5b similar to the porous combustion media 4a, ..., 4f are adhered to the inner surfaces of the upper wall and the lower wall of the main body 1, respectively. Such a combustion medium 4a,
, 4f and 5a, 5b form a zigzag-shaped exhaust gas passage whose direction is changed by 180 ° in the main body 1. The rear surface of the exhaust gas facing surface 41 of each of the porous combustion media 4a, ..., 4f
43 and the end surface 42 (see FIG. 3) are closed by an airtight material, and a large number of holes are formed in the exhaust gas facing surface 41 on the exhaust gas inflow side of each combustion medium 4a, ..., 4f. However, on the other side, many holes are sealed. Also porous media 5
The surfaces of a and 5b facing the exhaust gas are opened by a large number of holes, and the back surface thereof is closed by the inner surface of the wall of the main body 1.

The porous material of the above-mentioned porous combustion media 4a, ..., 4f, 5a, 5b is a mixture of cordierite (2MgO.2Al ₂ O ₃ .5S _i O ₂ ) and alumina (Al ₂ O ₃ ) and has a pore size of Is 0.3 to 5.0 mm
The commercially available product of can be used. This material has a high porosity of 80 to 90%, has a three-dimensional skeleton structure of continuous pores, has a large surface area and high catalytic reaction efficiency. Further, as the porous material, mullite, alumina, silicon carbide or the like can be used.

Further, as the airtight material for closing the surfaces 42, 43 of the porous combustion media 4a, ..., 4f, it is possible to use a material in which a paste-like heat-resistant material is applied at room temperature and heat-sintered to close many holes. You can
The paste-like heat-resistant material is, for example, a commercially available surface coating agent having a silica-alumina system (SiO ₂ · Al ₂ O ₃ etc.) as a main component and an off-white or white paste-like material having a heat-resistant temperature of 600 to 1700 ° or Adhesives can be used.

In the present embodiment, the exhaust gas G1 containing solid unburned matter such as soot or mist from the engine or the boiler combustion furnace flows into the unburned matter collection processing apparatus body 1, and the comb-shaped porous body is arranged inside the body. The high-quality combustion media 4a, 4c, 4e and the corresponding porous combustion media 4b, 4d, 4f pass through the combustion media 4a, 4c, 4f while greatly changing the flow direction and are discharged as shown by an arrow G2.

The porous combustion medium 5a, 5b is a solid unburned gas that comes out in front of the exhaust gas due to inertial force when the exhaust gas is turned by the combustion medium 5a, 5b and the porous combustion medium 4a, ..., 4f by approximately 180 °. Capture the minutes. In the porous combustion medium, the back surface of the surface facing the exhaust gas flow is closed by the wall of the main body 1, and the trapped solid unburned material does not blow through.

Further, the surface 41 of the porous combustion mediums 4a, ..., 4f located on the exhaust gas inflow side maintains the porosity of the combustion medium in an open state so that solid unburned matter can easily jump in and be captured. Moreover, when the direction of the flow of the exhaust gas changes as shown by the arrow in FIG. 3, the solid unburned components that fly out of the flow are captured by the inertial force. On the other hand, the surface 43 and the end surface located on the back surface
Since 42 is closed, the solid unburned matter that has jumped in from the surface 41 is prevented from jumping out. In this way, the solid unburned matter in the exhaust gas is passed through the porous combustion medium 4a, in the zigzag passage.
..., 4f, 5a, 5b are captured and become clean gas and discharged from the main body 1.

On the other hand, clean gas captured by the porous combustion media 4a, ..., 4f, 5a, 5b is discharged from the main body 1.

On the other hand, the solid unburned components in the exhaust gas captured by the porous combustion media 4a, ..., 4f, 5a, 5b are completely burned over time by oxygen and heat in the exhaust gas.

A second embodiment of the present invention will be described with reference to FIGS. 4 and 5. Except for the porous combustion media 4a, 4b ... Of this embodiment, it is the same as the first embodiment, so the same reference numerals are given in the figure and the description thereof is omitted.

6a, 6b, 6c, 6d, 6e, 6f are electric heaters embedded in the combustion medium 4a, 4b, the exhaust gas temperature passing through the unburned component combustion device is low, and the solid unburned components captured are completely burned. When it takes a long time to heat, it is energized and heated.

Also in the present embodiment, when the exhaust gas flows through the zigzag-shaped passage formed by the porous combustion medium, the solid unburned components are captured by the porous combustion medium without being blown through, and the electric heater 6a, ... , 6f completely burned by the heat.

In each of the above embodiments, combustion is performed by oxygen in the exhaust gas, but in order to supplement the amount of oxygen, a supplementary means such as supplying oxygen into the porous combustion medium may be provided. Good.

[Effect of device]

In the present invention, since the exhaust gas flow direction is greatly changed by using the porous combustion medium that blocks the gas blow-through, the solid unburned matter in the exhaust gas jumps out by its inertial force and is separated from the exhaust gas to enter into the pores of the combustion medium. The solid unburned matter can be separated from the exhaust gas with a high capture rate. Further, the collected solid unburned matter can be completely burned in the porous combustion medium over time.

[Brief description of drawings]

1 is a longitudinal sectional view of the first embodiment of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, FIG. 3 is an explanatory view of the porous combustion medium of the same embodiment, and FIG. FIG. 5 is a vertical cross-sectional view of the essential part of the second embodiment of the present invention, and FIG. 5 is a view taken along the line BB in FIG. 1 ... Unburned-mass-collection-processing-device main body, 4a, ..., 4f ... Porous combustion medium, 5a, 5b ... Porous combustion medium, 6a, ..., 6f ... Electric heater.

Claims (1)

[Scope of utility model registration request] 1. A device for collecting and processing unburned matter in exhaust gas, which comprises a porous combustion medium provided in an exhaust gas passage, wherein a plurality of the porous combustion media are arranged so as to change the flow direction of the exhaust gas. An apparatus for collecting and processing unburned matter in exhaust gas, characterized in that the back surface of the gas flow facing surface of the porous combustion medium is closed.