JPS6219269A - Cyclone dust collector - Google Patents

Abstract

PURPOSE:To efficiently remove the unburnt carbon in the waste gas by inserting a purified gas discharge pipe into the main body of the titled cyclone dust collector and providing a louver-like notch on the wall of the pipe. CONSTITUTION:In the cyclone dust collector, a purified gas discharge pipe 2 is inserted into the main body 1 of the cyclone and many louver-like notches 3 are provided in the lengthwise direction of the pipe 2 on the periphery of the pipe in the vicinity of the lower bottom. Furthermore, a porous ceramic filter equipped with a burner are furnished at the dust outlet. Consequently, the dust-contg. gas from an inlet 4 spirally flows down along the inner surface of the main body 1, the greater part of the dust moves downward, the gas is sent into the pipe 2 and the dust is further removed by the louver-like notch 3. Accordingly, the unburnt carbon in the gas exhausted from an internal combustion engine, etc., can be efficiently removed.

Description

[Detailed description of the invention] Field of application on Cl1li) The original F! This invention relates to an AFi cyclone type dust collector, particularly a cyclone type dust collector that efficiently removes unburned carbon contained in exhaust gas discharged from an internal combustion engine.

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

Although such unburned carbon can be suppressed to a certain extent by adjusting the engine/engine temperature, it is not permanent and requires readjustment in a relatively short period of time.

In order to deal with this situation, a method has been proposed in which the exhaust gas is filtered through a porous ceramic filter, and the unburned carbon is heated together with the filter using an electric heater, a burner, etc., and then combusted.

(A set point to be solved by the invention) However, the V4 adjustment of the engine has to frequently fail in short periods, and as the engine gets older, the FA
There is a drawback that the filter itself is difficult to clean, and the method of using a ceramic filter has the disadvantage that the exhaust gas is passed through the filter.
It has the disadvantage that it takes a large amount of heat to raise the exhaust gas above a certain temperature and burn the unburned carbon, and the gas pressure loss when passing through the filter is large, which may have an unfavorable effect on the engine, etc. be.

(Means for solving the problems) The present invention@ is based on the specific structure of the dust collector as a result of intensive research and examination aimed at eliminating these drawbacks of the conventional method. It was discovered that the emissions of unburned carbon can be substantially reduced even without the use of a filter, and there is no risk of trouble caused by gas pressure loss.

Thus, the structure of such a collector & container ri, the pipe wall of the clean gas extraction pipe purchased in the cycle 0/main body,
This is a cyclone type dust collector with a looper-shaped notch.

The present invention will be explained below using the accompanying drawings.

FIG. 1 shows a longitudinal section 11 of a cyclone type dust collector according to the present invention.
12Eji4, where l is the cyclone main body, and 2 is a purchased clean gas extraction pipe inside the main body.

The pipe is provided with a large number of looper-shaped cuts in the longitudinal direction of the pipe around the bottom of the pipe.

Figure 2 is a cross-sectional view taken along the 7-person line in Figure 1, and the opening direction of the notch 3 is opposite to the flow direction of the metal gas, and the opening angle Q is approximately 20 to 40 degrees. By doing so, a high concentration effect can be expected.

The material constituting the pipe 2 can be metal, but it is preferable to use ceramics, especially the looper-shaped notch 3, to provide sufficient corrosion resistance and heat resistance, as well as powder Wear resistance against 1 C
It is preferable because it makes the sex sufficiently clear. As such ceramics, for example, tugerite, silicon nitride, silicon carbide, etc. can be used as appropriate.

In this way, the dust-containing gas entering from the dust-containing gas population 4 flows down in a spiral along the inner wall of the cyclone main body t*l, forming a conical shape 111 like a normal cyclone, and most of the powder N continues to flow downward. Then, the gas moves to the clean gas extraction pipe 2.

When the waste is transferred to the pipe 2, the gas passes through the looper-shaped cut 3t, and at this time, the dust is further removed at this cut, and the dust remaining in the gas is further reduced.

In this way, the amount of dust contained in the clean gas can be reduced by about 10 to 30 tons compared to when a simple cyclone dust collector is used.

On the other hand, the separated powder W& is collected in an appropriate trap connected to the bottom of a normal cyclone and processed, but the present inventor has developed a method for processing dust by making such a trap into a specific form. You will find it easy to get along with your friends. That is, a looper-shaped notch 1 was provided in the pipe wall of the clean gas extraction pipe purchased into the cyclone body, and a porous ceramic 311 filter equipped with a combustion tool was provided at the dust outlet of the cyclone. It is a cyclone type dust collector.

Such a dust collector will be explained below with reference to the accompanying drawings.

Figure 3 is a longitudinal cross-sectional view of the dust collector according to the present invention, and the main body of the cyclone dust collector is shown in Figure 1.2 above.
The explanation will be omitted. Note that the reference numerals of each part indicate the same parts as in FIG. 1.2.

5 is a cylindrical porous ceramic fissure filter, which is housed in a container 6.

Each of the filters is a partition wall, and the clean gas that has passed through the filter flows into the compartment 8 separated by these walls. 9 is a clean gas outlet provided in the partition 1i1. 1O is a combustion burner, and this burner is constructed so as to be able to inject flame into the filter 5 obliquely from the shoulder portion of the container 6, as shown in the figure. A container 6 configured in this way is connected to the dust outlet 11 of the cyclone.

The porous ceramic fissure filter used in the present invention suitably has an average pore diameter of 10 to 40 μm and a porosity of about 30 to 60 μm.

If these physical properties deviate from the above-mentioned ranges, KFi and gas pressure loss will significantly increase, leading to clogging, or conversely, dust separation may become insufficient, which is not preferable.

As the ceramic material used for such a filter, for example, cordierite, aluminum titanate, mullite, alumina, β-spodume 7, etc. can be used as appropriate. Furthermore, if the thickness of the filter is too thin, the mechanical strength will be insufficient, and if it is too thick, the gas pressure loss will increase, so both are undesirable, and it is generally appropriate to adopt a thickness of about 5 to 201111. .

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

In the present invention, the combustion burner IO burns combustible dust such as unburned carbon accumulated in the filter 6 and its cylinder, and such combustion is normally performed intermittently. The fuel required for combustion is preferably one that does not generate much dust such as unburned carbon, such as gasoline or propane.

In addition, the figure shows a combustion burner, but the number is not limited to this; for example, the porous ceramic filter 5 can be provided with an electrode and energized, and the filter itself #F can be used as a heating element. 7t with tetraelectricity
You can also sip it. Alternatively, place a heating element such as a nichrome wire on the filter so that the filter does not impair its original function.
It can also be wrapped around I.

Since the combustible dust thus accumulated is burned in a portion of the filter, subsequent dust treatment becomes unnecessary, and only clean gas is discharged from the outlet 9.

As for the present invention! When this configuration is adopted, approximately 70 to 90% of the mucus-containing gas introduced into the cyclone fruit-making AB will exit from the FF tightening gas outlet pipe 2 on the cyclone side, and the porous ceramic filter will contain the total amount of gas. The advantage is that less than 30% of the gas is produced as soon as it comes, so the amount of heat required to burn the combustible dust is small. In order to control the gas amount in this manner, it is effective to provide a 12-ft damper near the outlet 9 and control the degree of opening and closing of this damper.

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

[Brief explanation of the drawing]

Figure m1 is a longitudinal cross-sectional explanatory diagram of a cyclone collector phoenix according to an example of the present invention. Fig. 2 Fi is a round cross-sectional explanatory diagram of Fig. 1 cut along the mm MK. FIG. 3 is an explanatory longitudinal cross-sectional view of a cyclone dust collector according to another example of the present invention. l; Cyclone body, 2; Clean gas extraction pipe, 3
; Looper-shaped notch, 5; Porous ceramic filter, io; Burner 81 Figure 2

Claims (1)

[Scope of Claims] 1. A cyclone-type dust collector in which a looper-shaped cut is provided in the wall of a clean gas extraction pipe inserted into the cyclone main body. 2. The cyclone type dust collector according to claim 1, wherein the looper-shaped cut opens in a direction opposite to the flow direction of the dust-containing gas in the cyclone, and the opening angle is 20 to 40 degrees. 3. The cyclone type dust collector according to claim (1), wherein the looper-shaped cut portion is made of ceramic. 4. A cyclone-type collection in which a looper-shaped cut is provided in the pipe wall of the clean gas extraction pipe penetrated into the cyclone main body, and a porous ceramic filter equipped with a combustion device is provided at the dust outlet of the cyclone. Dust container. 5. The cyclone type dust collector according to claim 5, wherein the porous ceramic filter has an average pore diameter of 10 to 40 μm and a porosity of 30 to 60%. 6. The cyclone type dust collector according to claim (5) or (6), wherein the porous ceramic filter is made of cordierite, aluminum titanate, mullite, alumina, or β-spodium.