JPS6226312A - Dust collector - Google Patents

Abstract

PURPOSE:To reduce fuel consumption required for burning combustible dust by regenerate a porous ceramic filter and reduce dust dispersed into the atmosphere by mounting the porous ceramic filter at the dust takeout part of a collision inertia type dust collector. CONSTITUTION:A dust collector 1 contains collision inertial type dust collecting elements 2 and said elements 2 open at their upper and the lower parts thereof to the perforated parts of perforated plates and separated from each other inside the dust collector 1 by partition walls 4. The collector 1 has both an entry 5 for dust containing air at the upper part thereof and purified gas outlets 6 at the side thereof, and said outlets are provided with both a nozzle 7 and a diffuser 8 from which gas is blown out at high pressure. In said constitution, a porous ceramic filter 9 is disposed inside a container 10 positioned below the collector 1 and a burner 11 is also mounted close to the inside of the filter 9 to eject flame therefrom. The dust collection effect can then be improved and quantity of heat used for burning combustible dust can be reduced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a dust collector, particularly a collision inertia silkworm dust collector that can efficiently process unburned carbon contained in exhaust gas discharged from an internal combustion engine. This is related.

(Prior Art) Exhaust gas from internal combustion engines of various handling vehicles and the like often contains unburned carbon, and since these are mobile pollution sources, they are considered to be a serious cause of air pollution.

Unburned carbon like this is an engine's X! Although it can be suppressed considerably by I, it is not permanent and requires readjustment in a relatively short period of time.

In addition, in order to deal with this situation, a porous ceramic filter is used to reduce exhaust gas by 1! ! :11! However, a method has been proposed in which unburned carbon is heated and combusted together with the filter using an electric heater, burner, etc. to regenerate the filter.

(Intermediate point to be solved by the invention) However, the IA* of the engine has to be changed frequently in a short period of time, and as the engine gets older, it becomes difficult to maintain the adjustment itself. Since the method using this method passes the entire amount of exhaust gas through the filter, it is necessary to raise the entire amount of exhaust gas above a certain temperature when burning the unburned carbon deposited on the filter.
This has the drawback of consuming a large amount of thermal energy, and also causes a large gas pressure loss when passing through the filter, which may have an undesirable effect on the engine and the like.

(Problem t - Means for Solving) As a result of various studies and examinations aimed at solving these various drawbacks of the conventional method, the present inventor used a specific type of dust collector, and this dust collector By installing a specific filter in the dust extraction part of the engine, the amount of fuel required to regenerate the filter by burning unburned carbon is reduced, and the burden on the engine due to gas pressure loss is minimized. Moreover, it has been discovered that the emission of dust into the atmosphere can be virtually eliminated.

Thus, the present invention provides a dust extraction section K of a collision inertia dust collector.
A porous ceramic filter is provided to provide a dust collector.

Hereinafter, the present invention will be explained using the attached mouthpiece.

Figure tJc1 is a longitudinal cross-sectional view of the dust collector according to the present invention, where 1 is the dust collector main body and 2 is a collision inertia dust collecting element.

The element 2 has an appropriate cross-sectional shape such as a cylindrical shape, and is open at the 30th part of the upper and lower perforations. Also, gas is prevented from leaking between the perforated plate 3 and the dust collector main woodwork. The dust collecting element 2 is made of Ph
An N demister type is suitable, and by adopting a porosity of about 60 to 99 cm as its physical properties, fine particles such as unburned carbon can be efficiently removed.

Reference numeral 4 denotes a partition wall that separates each collecting element 2 within the main body 1, and its function will be described later.

Figure 2 is an explanatory cross-sectional view taken horizontally along the line A-A' in Figure 1, and explains the structure and shows the relative positions of each part, and each reference numeral is the same as in Figure 1. It shows the location. However, in order to make it easier to understand, Figure 2 shows a horizontal cut of the complete dust collector.

Referring again to FIG. 1, 5 is the inlet for dust-containing gas, and 6 is the outlet for clean gas.

Reference numeral 7 denotes a nozzle for ejecting gas such as air at high pressure, and a diffuser 8 is provided near the tip of the nozzle.

When dust accumulates on the wall of the dust collecting element 2, such a nozzle blows high-pressure gas to blow away the dust inside the dust collecting element, so to speak, for backwashing. In such a case, if the partition wall 4 exists, the entire device is divided into two groups,
Each group of elements can be backwashed individually. Therefore, while one group is being backwashed, dust can be collected normally in the other group, making it possible to continue operating the internal combustion engine without stopping it at all.

Although only one partition wall 4 is shown in FIG. 2, the partition wall 4 is not limited to this, and may be provided so as to isolate a plurality of elements or one element at a time.

Reference numeral 9 denotes a cylindrical porous ceramic filter, which is housed in a container lo, which is connected to the dust outlet of the dust collector.

11 is a combustion burner, and this burner is designed to inject a flame into the filter 9. 12 is an outlet for clean scum.

The porous Se9Zx filter used in the present invention has an average pore diameter of 1o to 40μ and a porosity of 30 to 60μ.
%8. It is appropriate to adopt ttt. If these physical properties deviate from the above range, it is not preferable because the gas pressure loss will be extremely high, leading to clogging, or conversely, dust separation will be insufficient.

As the above-mentioned mix material used in such a filter, for example, fujiite, aluminum titanate, aluminum, β-subdume, etc. may be used as appropriate. Also, if the filter thickness is too thin, the mechanical strength will be insufficient, and conversely, if it is too thick, the gas pressure loss will be large. It is.

Further, the shape of the filter is not limited to a cylindrical shape, and any suitable shape may be adopted.

In the dust collector thus constructed, dust-containing gas is introduced from the inlet 5, and most of the gas is crystallized while passing through the dust collecting element 2, becoming clean gas as shown by the arrow and passing through the outlet 6. released from. At this time, in order to make it easier for the gas to be released to the outlet 6 side, the caster is removed from the outlet side by appropriate known means.
Although suction is effective, suction may not necessarily be necessary depending on the inflow pressure of the dust-containing gas. On the other hand, the dust passes through the 30th perforated plate below from inside the element, descends through the constriction section at the bottom of the dust collector along with some gas as shown in the arrow, reaches the porous 7':) mix filter 9, and then Only the gas passes through the filter as shown by the arrow and is released from the outlet 12. The dust deposited on the filter circle is burned by the burner 11. Combustion is usually carried out intermittently, and the fuel required for this is preferably a fuel such as gasoline or propane that does not generate much dust such as unburned carbon. Again 1
If you die in the dark, it will not show the combustion nozzle (-ner) and the next one will be Kla, but for example, by providing an electrode on the filter 9 and energizing it,
The filter itself can also be used as a heating element, and for this reason, it is also possible to add electrical conductivity to the filter itself. Alternatively, a heating element such as nichrome wire can be wrapped around the filter to the extent that the original function of the filter is not impaired.

Since the dust thus accumulated is burned in a part of the filter, subsequent dust treatment becomes unnecessary, and only the clean gas is discharged from the outlet 12.

When the configuration of the present invention is adopted, approximately 70 to 90% of the amount of dust-containing gas introduced into the dust collector will exit from the clean gas outlet 6, and due to its porosity, all of the dust will be transferred to the 2-mix filter side. This method has the advantage that only a small amount of heat is consumed when combusting combustible dust, since the amount of gas required is less than 30% of the amount of gas. In order to control the gas IIT in this way, it is effective to control the gas suction force applied to the clean gas outlet 6, or to provide a damper at the clean gas outlet 12 on the filter side and control the degree of opening/closing of this damper. .

The dust collector according to the present invention is suitable for treating combustible dust-containing gas such as unburned carbon-containing exhaust gas discharged from internal combustion engines such as automobiles.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view of a dust collector according to an example of the present invention. Fig. 2 is an explanatory diagram of Fig. 1 cut along the Moom 1 line. 1; Dust collector main body, 2; Collision inertia dust collecting element, 9; Porous Seven Fox filter, 11; Combustion tool'''7 Figure 1 Figure 2

Claims (1)

[Claims] 1. A dust collector in which a porous ceramic filter is provided in the dust extraction part of the collision inertia dust collector. 2. The dust collector according to claim 1, wherein the porous ceramic filter has an average pore diameter of 10 to 40 μm and a porosity of 30 to 60%. 3. The dust collector according to claim 1 or 2, wherein the porous ceramic filter is made of cordierite, aluminum titanate, mullite, alumina, or β-subodiumne. 4. The dust collector according to claim (1), wherein the dust collecting element of the collision inertia dust collector has a backwashing nozzle. 5. The dust collector according to claim (1), wherein the porous ceramic filter is equipped with a combustion device.