JPS608412A - Discharged fine particle removing device in diesel-engine - Google Patents

Abstract

PURPOSE:To effectively remove graphite fine particles, by changing the positions of the fine particle trapping section and fine particle oxidizing/extinguishing section of a filter with respect to each other at predetermined time intervals. CONSTITUTION:Exhaust gas containing fine particles is introduced through an introduction pipe 1 into a filter 2 where the exhaust gas flows through one side half of the filter 2, and is then discharged through an exhaust pipe 3 after the fine particles are trapped. Then the filter 3 is rotated by a motor 6 so that the one side half which traps the fine particles are shifted to the high temperature passage 4, 5 side, and the other side half is shifted to the exhaust gas passage 1, 3 side. Since the one side half which traps the fine particles is heated hot gas produced from a burner consisting of a blower 6 and a fuel nozzle 7, the fine particles trapped in the filter 2 are oxidized and disappears.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diesel engine exhaust particulate removal device for purifying diesel engine exhaust gas.

In a diesel engine, generally all liquid fuel is injected into the compressed air in the cylinder and the fuel is combusted to obtain power. For this reason, depending on the operating conditions, sufficient contact between air and fuel may not occur, and in this case, generation of black smoke is unavoidable.

This black smoke is caused by the exhaust gas containing fine particles, which are free carbon and tar that result from thermal decomposition of fuel droplets in the combustion chamber of the engine when they are exposed to high temperatures without contacting the air. Therefore, if these fine particles are mixed with oxygen-containing air and kept at high temperatures for a certain period of time, they will oxidize and disappear, and they are characterized by having no ash content. This reaction time is not secured in the combustion chamber of the engine before it is exhausted and becomes black smoke.

The above-mentioned black smoke is one of the problems with diesel engines, and especially in automobiles, it is an emergency because it is related to so-called pollution such as air pollution in urban areas with heavy traffic and worsening of visibility in tunnels. This is considered an issue that needs to be solved.

This invention was made in view of the above problem, and by changing the positions of the particulate collecting part and the particulate oxidizing part of the filter at predetermined intervals, particulates in black smoke can be effectively removed. The purpose of the present invention is to provide an exhaust particulate removal device for a diesel engine.

An embodiment of the present invention will be described below based on the drawings. In the figure, reference numeral 1 denotes an inlet pipe for the exhaust gas flow path, and this inlet pipe 1 communicates with an exhaust pipe 3 through a half of a rotatably installed filter 4.

Reference numeral 4 denotes an inflow pipe of the high temperature air passage, and this inflow @4 communicates with the combustion gas discharge pipe 5 via the other half of the filter 2. A burner constituted by a blower 6 and a fuel nozzle 7 is disposed in the inlet pipe 4 and supplies high-temperature air. 8 is a motor, and the filter 2 is a motor 8.
between the exhaust gas flow path and the high temperature air flow path,
The gas passage position changes sequentially.

Next, the entire operation of the exhaust particulate removal device configured as described above will be explained.

Exhaust gas containing particulates discharged from a diesel engine (not shown) flows in through an inlet pipe 1, passes through one half of a filter 2, and is discharged to the outside through an exhaust pipe 3. The exhaust particulates are separated from the gas and collected in the labyrinth part of the filter 2 by sudden changes in flow velocity and flow direction, so the gas exhausted from the exhaust pipe 3 is clean and almost no black smoke is emitted.

Next, the filter 2 is rotated by a half rotation by the motor 8, and one half of the filter 2, which has collected the exhaust particles, moves to the high temperature air flow path, and the other half moves to the exhaust gas flow path. and blower 6
High-temperature gas generated by a burner comprising a fuel nozzle 7 and a fuel nozzle 7 is supplied to one half of the filter 2 through an inlet pipe 4 and heated. The burner is operated so that combustion is performed at an excess air ratio of 1.0 or more and the burned gas contains sufficient oxygen. The free carbon and tar particles thus collected in the filter 2 are oxidized and annihilated by being given a sufficient reaction time under high temperature conditions containing oxygen.

As the filter 2 rotates in this manner, the particulate collection part and the oxidation and annihilation part sequentially change positions, and the particulates discharged from the diesel engine are collected one after another and annihilated by the oxidation reaction, so that the exhaust gas is clean. The black smoke is removed.

Similarly, in the above embodiment, one half of the filter 2 is replaced with the other half by rotating the filter 2, but this may also be done by rotating the filter 2 in forward and reverse directions. The same effect can be achieved even if the entire position is changed.

As described above, according to the present invention, the exhaust particulate removal device fffi'k for a diesel engine forms an exhaust gas passage that passes through a part of the filter and a high-temperature air passage that flows through the other part. Since the parts are configured to alternate at predetermined intervals, the particulate collection part of the filter can be used in a constantly regenerated state, which effectively removes particulates contained in diesel engine exhaust gas and prevents black smoke. There are other effects.

[Brief explanation of drawings]

The drawing is a cross-sectional view showing the configuration of a diesel exhaust particulate removal device according to an embodiment of the present invention. 1...Introduction pipe (exhaust gas flow path), 2...Filter,
3... Exhaust pipe (exhaust gas flow path), 4... Inflow pipe (high temperature air flow path), 5... Exhaust pipe (high temperature air flow path), 8...
·motor. Agent Masuo Oiwa

Claims (1)

[Claims] A filter that collects particulates contained in the exhaust gas of a diesel engine, an exhaust gas flow path that flows through a part of the filter and through which the exhaust gas flows, and high-temperature air that flows through another part of the filter and through which high-temperature air containing sufficient oxygen flows. A diesel engine exhaust particulate removal device comprising a flow path, wherein one part of the filter and the other part of the filter are arranged to alternate positions with respect to both the flow paths at predetermined time intervals. Device.