JPH0486315A - Reclaiming device for soot collecting filter - Google Patents

Abstract

PURPOSE:To lower a heat resisting temperature of a soot collecting filter so that the material of the filter can be selected in a wide range by installing the soot collecting filters respectively downstream of dust collectors arranged in two exhaust pipe passages which can be selectively switched, so that high pressure air can be supplied from the exhaust side of the filter. CONSTITUTION:Between two exhaust pipe passages 2, 3 branched from an exhaust inlet pipe 1 and an exhaust outlet pipe 4, two soot collecting filters 5, 6 and two cyclone dust collectors 7, 8 are arranged respectively, so that the exhaust from a diesel engine can be selectively introduced into the soot collecting filter 5 or 6 by switching a valve body 9a, 9b through the operation of a switching valve 9. Back washing air pipes 12, 13 are connected to the exhaust outlet side of the soot collecting filters 5, 6 via switching valves 10, 11, so that high pressure air can be supplied. The cyclone dust collectors 7, 8 are constituted in such a manner that they collect the soot by the effect of centrifugal force and incinerate the soot by means of electric heaters 14, 15, which are installed at the bottom parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a regeneration device for a tin-trapping filter for removing tin such as carbon from exhaust gas in a diesel engine.

[Prior Art] In recent years, exhaust gas regulations for vehicles driven by internal combustion engines, especially diesel engines, are becoming stricter on a global scale, and in order to meet these strict regulations, it is no longer necessary to change the combustion method of conventional engines. The current situation is that it cannot be dealt with in this way.

By the way, in order to remove tin from exhaust gas, it is common to pass υ1 gas through a filter made of porous ceramics and directly burn the tin adhering to the filter. The combustion methods include: ■ Applying a catalyst to the surface of the filter and firing it to burn it at the exhaust gas temperature, electric heater,
A method in which the filter is burned by a combustion burner, ■ A method in which the filter is heated and burned with an electric heater, ■ A method in which a part of the fuel is used to heat and burn the filter in a burner % formula % [Problem to be solved by the invention] ] However, with method (2), the manufacturing cost of the filter increases, and in diesel engines, the catalyst is poisoned by sulfur compounds in the fuel.
Furthermore, when exhaust gas is used as the only heat source, there is a problem that this is not always possible depending on the engine condition.Furthermore, in the method (■) above, the electric heater consumes a lot of power, making it unsuitable for vehicles that use batteries as a power source. Furthermore, the method (2) has the problem that the filter is eroded and damaged by the combustion heat of tin.

The present invention solves the above problem, and is capable of lowering the heat-resistant temperature of the filter to the exhaust gas temperature.
It is an object of the present invention to provide a regeneration device for a tin-trapping filter, which allows a wide variety of filter materials to be selected and allows the filter to be regenerated without stopping the engine.

[Means for solving the problem] To this end, the tin-trapping filter regeneration device of the present invention has the following features:
Two exhaust pipes 2.3 that can be selectively switched by operating a switching valve 9, a dust collector 7.8 disposed in each of these exhaust pipes, and a dust collector disposed downstream of the dust collector. a tin-trapping filter 5.6, and a backwash air pipe 12.13 that makes it possible to supply high-pressure air from the exhaust side of the tin-trapping filter;
It is characterized by having combustion devices 14 to 17 provided in the dust collector 7.8. Note that the numbers added to the above configurations are for comparison with the drawings, so that the configurations of the present invention are not explained in any way. It is not limited.

[Function] In the present invention, for example, when tin is collected in the tin-collecting filter 5 and the filter needs to be regenerated, the switching valve 9 opens, for example, the valve body 9b, and then the valve body 9
a is closed, exhaust gas is discharged through the tin-trapping filter 6, and the tin-trapping filter 5 is regenerated. During regeneration, the on-off valve 10118 is opened, high-pressure air is injected from the exhaust side of the tin-collecting filter 5, and the tin collected by the filter is settled in the cyclone-type dust collector 7 and collected in the dust collector 7. The burned tin is combusted by air supplied from the electric heater 14 and the combustion air pipe 16.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the tin-trapping filter regeneration device of the present invention, FIGS. 2 and 3 show examples of the tin-trapping filter, and FIG. 2 is a partially sectional view. , FIG. 3 is a perspective view showing the concept of the filter shape.

In this embodiment, the exhaust inlet pipe 1 is branched into two exhaust pipes 2.3, and two tin-collecting filters 5.6 and a cyclone dust collector 7 are provided between each exhaust pipe 4 and the exhaust outlet pipe 4. .8 is arranged, and by operating the switching valve 9, the valve body 9 a1
9b is switched, the exhaust from the diesel engine selectively passes through one of the tin-collecting filters 5.6, becomes clean gas, and is discharged from the exhaust outlet pipe 4.

The tin collecting filter 5.6 is manufactured from a porous ceramic material such as cordierite, aluminum titanate, mullite, alumina, etc., and as shown in FIGS. The inlet side A has a substantially triangular pyramid shape with a larger diameter.

Further, a backwashing air pipe 12.13 is connected to the exhaust outlet side of the tin collection filter 5.6 via an on-off valve 10.11 to enable supply of high-pressure air.

The cyclone dust collector 7.8 collects tin by the action of centrifugal force, has an electric heater 14.15 at the bottom, and has a combustion air pipe branched from the backwash air pipe 12.13. 16 and 17 are connected via on-off valves 18 and 19. Note that a plate 7a18a is arranged between the dust collector 7.8 and the inlet of the tin collection filter 5.6, and when backwashing the tin collection filter 5.6, the dust collector 7 .8
This prevents the tin that has accumulated inside from flying up.

'' The operation of the present invention having the following two configurations will be explained.

Now, assuming that the valve body 9a is opened and the valve body 9b is closed by the switching valve 9, the exhaust gas from the diesel engine passes through the exhaust inlet pipe 1, the exhaust pipe line 2, the tin collection filter 5, and then exits the exhaust outlet pipe. It is discharged from 4. When tin is collected in the tin-collecting filter 5 and the filter needs to be regenerated, the switching valve 9 opens the valve body 9b and then closes the valve body 9a, and the exhaust gas is routed through the exhaust inlet pipe 1 and the exhaust pipe. 3. It passes through the tin-collecting filter 6 and is discharged from the exhaust outlet pipe 4. Note that the state requiring regeneration of the filter may be determined by detecting the exhaust pressure on the gas clean side, or by measuring the usage time of the filter.

Then, the tin collecting filter 5 is regenerated.

This opens the on-off valve 10.18, injects high-pressure air from the exhaust side of the tin-collecting filter 5, and causes the tin collected by the filter to settle in the cyclone dust collector 7. At this time, since the tin collecting filter 5 has a substantially triangular pyramid shape with a larger diameter on the exhaust inlet side, the tin becomes lumps and is easily peeled off from the filter. The tin collected in the cyclone dust collector 7 is transferred to an electric heater 14 and a combustion air pipe 1.
The combustion is carried out by the air supplied from 6, and the exhaust gas is discharged from the exhaust outlet pipe 4 through the exhaust pipe 3 and the tin-collecting filter 6.

When the tin-trapping filter 6 needs to be regenerated, the above-described operations are repeated to perform the regeneration.

Note that the present invention is not limited to the embodiments described above, and various modifications can be made.

For example, in the above embodiment, an electric heater is used to burn tin, but a combustion burner may also be used.

[Effects of the Invention] As described above, according to the present invention, the heat-resistant temperature of the filter can be lowered to the exhaust gas temperature, a wide variety of filter materials can be selected, and the filter can be heated without stopping the engine. Filter regeneration is possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the tin-trapping filter regeneration device of the present invention, FIGS. 2 and 3 show examples of the tin-trapping filter, and FIG. 2 is a partially sectional view. , FIG. 3 is a perspective view showing the concept of the filter shape. 2.3...Exhaust pipe line, 5.6...Tin collection filter, 7.8...Cyclone type dust collector, 9...Switching valve, 12.13...Backwash air Tubes, 14-17... Combustion device.

Claims (2)

[Claims] (1) Two exhaust pipes that can be selectively switched by operating a switching valve, a dust collector installed in each of these exhaust pipes, and a tin trap installed downstream of the dust collector. A filter for collecting tin, comprising: a filter for collecting tin, a backwash air pipe that makes it possible to supply high-pressure air from the exhaust side of the filter for collecting tin, and a combustion device provided in the dust collector. playback device. (2) The tin-trapping filter regeneration device according to claim 1, wherein the tin-trapping filter has a substantially triangular pyramid shape with a diameter larger on the exhaust inlet side than on the exhaust outlet side. .