JP2001248422A - Method for burning soot by flame exhaust of diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purifying method for soot contained in the exhaust gas of a diesel engine. SOLUTION: A heat resistant filtering net 2 for burning soot is provided at an exhaust outlet 1 adjacent to the exhaust valve 4 of a diesel engine, and the soot contained in the exhaust gas 3 is burnt by the filtering net heated to a red-hot state by receiving the flame 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 exhaust gas purification measure for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, as a countermeasure against soot discharged from a diesel engine, there is a soot combustion method in which a burner type combustion device is provided in a portion close to a muffler. There is also a measure against soot by means of a filtration net near the muffler, but soot cannot be cleaned because the outer cylinder of the filtration net can be used. Since these devices are a method for purifying soot that has already been cooled, their purification performance is inferior. It is also expensive. On the other hand, the catalyst loses its catalytic function only by adhering soot. Therefore, exhaust gas countermeasures have not been resolved. Next, a measure for purifying automobile exhaust gas is disclosed in Japanese Patent Application No. 63-18 / 88, filed by the present inventors.
There is a method for purifying 886639 exhaust gas. The principle of the invention is a wet method in which exhaust gas is passed through water and soot is adsorbed on the water. The device is a method in which a muffler that also serves as a tank containing water is provided, a separator (partition plate) made of wire mesh is provided on the muffler, and the separator is washed with the oscillating power of an automobile. The problem was abandoned because of problems with soot-containing sewage treatment, water replenishment, labor, management, officials, manufacturers, etc. However, the purification ability is outstanding, and soot of exhaust gas is almost 100% purified.
The experiment was conducted at the Hiroshima Prefecture Industrial Technology Center. Experimental data includes Guangxi Engineering No. 1767 and 1768.

[0003]

An object of the present invention is to purify soot discharged from a diesel engine.

[0004]

As a means for burning soot contained in the exhaust gas from the exhaust port, a heat-resistant filtration net is provided at the exhaust port near the exhaust valve.

[0005]

[Action] In the past, it was popular to provide supercharged air at the exhaust port of diesel engines. The problem of the supercharged air (turbocharger) will be described because the filter net for preventing soot of the present invention is provided at the exhaust port. The purpose of using supercharged air is to supplement the lack of oxygen in high altitude aircraft.
Therefore, it is unnecessary for an automobile gasoline engine running on the ground where oxygen is sufficiently present. Supercharging a gasoline engine with enough oxygen does not improve horsepower. In the case of a diesel engine, light oil having a high viscosity and a large mass is used, so that there is a condition that soot is easily generated. However, supercharged air having exhaust turbine blades that hinder exhaust gas emission further increases soot generation. The publicity complains about measures to improve horsepower, but it is difficult to turn, causing immeasurable pollution. If the supercharged air, which has poor performance and is difficult to rotate, is continuously operated for a long time, even the large-sized casing (outer cylinder) becomes red-hot. Therefore, if a filter net 2 is provided at the exhaust port 1 close to the exhaust valve, soot will strike and burn the filter net 2 red-heated by the flame exhaust 3 at a high speed, so that measures against medium pollution can be taken. If the exhaust gas containing soot passes through the mesh, the combustion effect of soot is not sufficient. Therefore, if two or more mesh filter nets are provided at intervals as shown in FIG. improves. In addition, an electric heating type filtration net, an air blowing type filtration net or a burner type filtration net can be considered, but it is a subject to be solved in the future because it becomes complicated.

[0006]

EXAMPLES As a test before carrying out the present invention, a spark burning test was conducted using a gas burner, a filtering net, a black pigment (carbon), and the like. Since experiments using a diesel engine and a gasoline engine are extensive and require a long period of time, there are no experimental examples of internal combustion engines. Also, the test of the amount of soot contained in the exhaust gas requires a large-scale test facility and many types of vehicles, and the results of the examples cannot be obtained in a short period of time.

[0007]

According to the present invention, the filtration network provided at the exhaust port close to the exhaust valve of the diesel engine is heated by the flame of the exhaust gas, and the soot is burned by the glowing filtration network, so that the soot can be almost completely burned. Extremely simple and less troublesome purification measures can be realized. On the other hand, in the case of a gasoline engine, the compression ratio is reduced to suppress the generation of nitrogen oxides.
Both x and CO emissions decrease. A medium-combustion filter is very simple and inexpensive because it is only a filter net.
Although heat resistance and durability are required, they can be replaced, so there are few problems and the spread is quick. If the test results are good, it is a simple device and the exhaust pipe is exposed, so it can be attached to the car currently in use.

[Brief description of the drawings]

FIG. 1 is a side view of a two-stage filtration network in which a filtration network for soot combustion using flame exhaust according to the present invention is provided at an exhaust port near an exhaust valve of a diesel engine. (Note) To make it easier to understand the operation and effect of the present invention, all figures of Hino Ranger-KIS type EH100 are cited as examples, and parts not directly related to the present invention are reference figures.

FIG. 2 is a front reference view of an example of a two-layer filter net for soot combustion of the present invention.

FIG. 3 is a side sectional view of FIG. 2;

[Explanation of symbols]

 1. 1. An exhaust port close to the exhaust valve of a diesel engine 2. Two-stage filtration network Flame exhaust 4. Exhaust valve

Claims (1)

[Claims] An exhaust port (1) close to an exhaust valve of a diesel engine is provided with a filtration network (2) for soot combustion, and the exhaust gas is heated by a filtration network (2) that is red-heated by receiving the flame of the exhaust gas. A method for burning soot by flame exhaust (3) discharged from an exhaust port (1) of a diesel engine, characterized by incinerating soot contained.