JPH066181Y2 - Exhaust gas particle treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a particle treatment apparatus for capturing and regenerating particles in exhaust gas of an internal combustion engine.

(Prior Art) Exhaust gas of an internal combustion engine, especially a diesel engine, contains fine particles containing carbon as a main component, and if released into the atmosphere as it is, it causes air pollution. Is provided. In this fine particle processing apparatus, a fuel ejector for injecting fuel, a collision plate for dispersing the fuel injected from the fuel ejector, and a glow plug as an ignition source are arranged in front of a casing containing a racemic filter. The burner cylinder is provided. Further, the burner cylinder is provided with an auxiliary air supply pipe tangentially. The exhaust pipe is branched in front of the casing, and a switching valve is arranged at the branch point. When the filter is clogged with fine particles in the exhaust gas, air is sent from the auxiliary air supply pipe into the burner cylinder, binding the casing side by the valve of the exhaust pipe, and starts to swirl along the inner wall. Then, the fuel is ejected from the nozzle of the fuel ejector toward the collision plate, the fuel is scattered into fine particles and ignited by the glow plug to generate a flame and directed to the filter, and the fine particles captured by the filter are burned and regenerated. .

(Problems to be solved by the invention) However, such an exhaust gas fine particle treatment device has an advantage that a burner cylinder, which is an ignition portion for igniting fuel particles, does not have to be cooled, but the time until ignition is performed. Therefore, even if the burner cylinder is cooled by the atmosphere and ignited by the glow plug, it takes time for the fuel to completely burn into flame, and during that time, the fuel injected from the fuel ejector to the collision plate enters the burner cylinder. There is a problem that the fuel accumulates and consumes excess fuel, and the accumulated fuel is vaporized by a flame to cause explosive combustion.

(Means for Solving the Problems) The fuel pipe is branched, one first fuel pipe is connected to the first fuel ejector, and the other second fuel pipe is connected to the second fuel ejector arranged in the auxiliary air supply pipe. A switching valve is provided near each of the branch points of the fuel pipe while being connected.

(Operation) When the filter is clogged, the valve of the second fuel pipe on the auxiliary air supply pipe side is closed, and the first fuel ejector side first fuel pipe is closed.
The switching valve of the fuel pipe is opened to ignite the fuel injected into the collision plate. After the fuel is ignited, the switching valves of the first and second fuel pipes are half-opened, the fuel is injected from the first fuel ejector toward the collision plate, and the second fuel ejector is sprayed into the auxiliary air supply pipe. -Like fuel is supplied, air is mixed, and it is sent into the burner cylinder. After a certain period of time, the switching valve of the first fuel pipe is closed, the switching valve of the second fuel pipe is fully opened, and it is mixed with air and sent into the burner cylinder.

(Example) The exhaust particulate treatment system 1 shown in FIG. 1 comprises a filter device 2 and a burner device 3. The filter device 2 is composed of a casing 11 provided in the middle of an exhaust pipe, a filter 12 housed therein, and a branched exhaust pipe 13, and the casing 11 is a cylindrical portion 14 made of a stainless material having excellent heat resistance.
And inlet / outlet pipes 15 and 16 connected to the exhaust pipe 13 and connected to the conical inlet / outlet portion are provided on both sides. A combustion ring 17 having an opening at the center is attached to a connection portion between the inlet pipe 15 and the exhaust pipe 13. The filter 12 is a so-called wall-through type in which the inlet side and the outlet side of a large number of parallel passages which are formed of ceramic and are partitioned by a thin plate in a grid pattern are alternately closed.
It is accommodated in via a cushioning material. A bypass pipe 18 that does not pass through the casing 11 is branched in the middle of the exhaust pipe 13 before entering the casing 11, and the second switching valve is provided near the branch point.
19 and the first switching valve 20 near the inlet pipe 15 of the casing
Are provided respectively. These switching valves 19 and 20 are connected to the controller 4 to operate. A differential pressure detection pipe and a temperature detection pipe are provided at the inlet and outlet of the casing 11.

The burner device 3 is coaxially arranged on the entire surface of the filter 12.
It is mainly composed of a burner cylinder 31, a first fuel ejector 32, and an auxiliary air supply pipe 33. The burner cylinder 31 has a cylindrical shape with one end open and the other end closed, and the first fuel ejector 32 is attached to the closed end. The first fuel ejector 32 is provided with a nozzle for forming relatively large particles toward the filter 12. In the burner cylinder 31, the collision plate is coaxial with the nozzle.
34 is provided, and a glow plug 35, which is an ignition source, is arranged below the front of the collision plate 34. A combustion ring 36 is attached to the open end side of the burner cylinder 31. Further burner cylinder 31
An opening of the auxiliary air supply pipe 33 is provided in the tangential direction near the nozzle of the fuel ejector 32 on the closed end side. The fuel pipe connected to the fuel tank (not shown)
It is branched into a fuel pipe 38 and a second fuel pipe 39, the first fuel pipe 38 is connected to the first fuel ejector, and the second fuel pipe 39 is connected to the second fuel ejector 37 provided in the auxiliary air supply pipe 33. ing.

A first switching valve 40 is provided in the first fuel pipe 38 near the branch point of the fuel pipe, and a second switching valve 41 is provided in the second fuel pipe 39. Each switching valve is a controller 4
Operated by. The nozzle provided in the first fuel ejector 32 has holes for forming relatively large particles,
The nozzle provided in the fuel ejector 37 is not affected by the fine particles in the exhaust gas and has a fine hole.

In a state where the filter 12 is not clogged, the bypass pipe 18 side of the exhaust pipe is closed by the second switching valve 19 (the first switching valve 20 is open). The exhaust gas containing fine particles is discharged from the inlet pipe 15. It passes through the filter 12 and is discharged to the atmosphere via the outlet pipe 16. When passing through the filter 12, fine particles in the exhaust gas are captured and cleaned. When the filter 12 captures particulates and detects a predetermined pressure difference, the first switching valve
20 is closed and the second switching valve 19 in the bypass pipe 18 is opened. At the same time, air is sent from the auxiliary air supply pipe 33 into the burner cylinder 31.

The second switching valve 41 of the second fuel pipe 39 is closed, and the first
The first switching valve 40 in the fuel pipe 38 is fully opened to send the fuel to the first fuel ejector 32. When the fuel is ignited in the burner cylinder 31, the first and second switching valves 40 and 41 are half opened and the first
Fuel is ejected from the fuel ejector 32 toward the collision plate 34, and atomized fuel is sprayed and mixed from the second fuel ejector 37 into the air in the auxiliary air supply pipe. The atomized fuel that has entered the burner cylinder 31 rapidly spreads by touching the pilot fire that has not yet grown to a sufficient flame, and assists the combustion of the fuel particles scattered at the collision plate 34. After a lapse of a certain time, the first switching valve 40 is fully closed to stop the fuel injection from the first fuel ejector 32, and the second switching valve 41 is fully opened to the second fuel ejector.
The air in the auxiliary air supply pipe 33 is sprayed from 37 to completely burn the fuel. The switching valve may be one provided at the branch point of the fuel pipe.

(Effects of the Invention) As described above, the present invention has a casing containing a filter in the middle of an exhaust pipe, and a burner cylinder having a first fuel ejector arranged in front of the casing, and an auxiliary member for the burner cylinder. An air supply pipe is provided in a tangential direction, a fuel pipe is branched into a first fuel pipe and a second fuel pipe, the first fuel pipe is connected to the first fuel ejector, and a second fuel pipe is provided in the auxiliary air supply pipe. Since it is connected to the provided second fuel ejector and the switching valve is provided at the branch point of the fuel pipe, the atomized fuel is mixed with the air in the auxiliary air supply pipe and supplied to the flame in the burner cylinder, and the flame grows. It becomes faster and the extra fuel does not have to be disinfected. Further, the supplied fuel is always completely burned, and the flame can be stabilized.

[Brief description of drawings]

FIG. 1 is a sectional view of the particle processing apparatus, and FIG. 2 is a partially enlarged view thereof. 1 ... Particulate processing device, 31 ... Burner cylinder 32 ... First fuel ejector 33 ... Auxiliary air supply pipe 37 ... Second fuel ejector 38 ... First fuel pipe, 39 ... Second fuel pipe 40, 41 ... Switching valve

Claims (1)

[Scope of utility model registration request] 1. A casing containing a filter is arranged in the middle of an exhaust pipe, a cylindrical burner cylinder having one end open and the other end closed is provided in front of the casing, and the first fuel is provided at the closed end of the burner cylinder. An ejector is arranged, a collision plate and a glow plug are arranged in the burner cylinder, an auxiliary air supply pipe is tangentially provided in the burner cylinder, and a fuel pipe is provided between the first fuel pipe and the second fuel pipe.
A fuel pipe is branched, a first fuel pipe is connected to the first fuel ejector, a second fuel pipe is connected to a second fuel ejector provided in the auxiliary air supply pipe, and a switching valve is provided at a branch point of the fuel pipe. Exhaust gas particulate treatment device provided.