JPS60206926A - Engine exhaust gas purifier - Google Patents

Abstract

PURPOSE:To burn the combustible particulates well in Diesel engine even when the exhaust gas temperature is low by coating catalyst and hydrocarbon uniformly onto the surface of combustible particulates thereby lowering the firing temperature of combustible particulates considerably. CONSTITUTION:A particulate filter 4 is arranged in the exhaust path 3 of Diesel engine 1 to catch the combustible particulates in the exhaust gas. While an injector 5 is arranged in the upstream of said filter 4. Said injector 5 is constructed with a tank 6 for storing aqueous catalyst hydrocarbon emulsion, an injector 7 having an injection port facing with the upstream of said filter 4, a communication pipe 8 for connecting between them, a pump 9 arranged in said pipe 8, etc. Upon exceeding of the back pressure of engine 1 due to clogging of said filter, said emulsion in the tank 6 is ejected through the injector 7 thus to achieve the purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a carrot exhaust gas purification device.
IJ) Combustible carbon particles, etc. contained in air gas
Concerned with the improvement of the K(+) which can be removed by burning it.

(Prior art) Conventionally, as an exhaust gas purification device for this scale, for example, 11
As disclosed in Publication No. 56-98519, a catalyst filter is disposed in the exhaust system of one engine to collect combustible particles in the exhaust gas and undergo an oxidation reaction, and a catalyst filter is disposed upstream of the catalyst filter. By installing an injector that injects auxiliary fuel such as liquid fuel or gaseous fuel into the exhaust gas, the temperature of the exhaust gas is heated above the ignition temperature of combustible particles by the reaction by the catalyst of the catalyst filter and the promotion of combustion by the auxiliary fuel. It is known that the collected combustible particles are removed by combustion.

However, in the above-mentioned conventional exhaust gas purification system, in the normal operation range where the exhaust gas temperature is low, the exhaust gas temperature is not far enough away from the ignition cap of the combustible particles.
The combustible particles remain as they are without being burned, and the combustible particles clog the medium filter, which increases the back pressure in the exhaust system and makes it impossible for the engine to operate properly. There's a problem.

For this reason, a method has been proposed in which a catalyst solution is supplied upstream of the filter and the catalyst is deposited on the surface of the combustible particles, thereby lowering the ignition temperature of the flammable particles through the reaction of the catalyst. . However, for example, in a diesel engine, the exhaust gas temperature in the normal operating range is approximately 200 to 300℃.
Since the temperature is particularly low at 00°C, it is difficult to completely burn off combustible particles even with the above proposal.

(UJ aspect of the invention) An object of the present invention is to lower the ignition temperature of the combustible particles by touching the surface of the combustible particles and uniformly coating the surface with hydrocarbons.
By lowering the temperature to I, combustible particles can be burned well and reliably removed even when the exhaust gas temperature is low in a diesel engine or the like.

(Structure of the Invention) In order to achieve the first objective, the solution of the present invention is as follows:
It is attached to the exhaust gas purification neck of the engine, which contains Patikil-1-Noirta, which collects combustible particles in the air system.
This is an injector that mixes catalyst liquid and hydrocarbon liquid in the upper ME of the above particulate filter. By injecting a mixed liquid such as catalyzed Al liquid or hydrocarbon liquid to uniformly deposit the catalyst and hydrocarbons on the surface of the combustible particles, the oxidation reaction by the catalyst and the combustion promoting effect of the hydrocarbons can be promoted. Accordingly, the ignition temperature of the combustible particles is lowered.

(Effects of the Invention) Therefore, according to the present invention, 1 m of a mixed liquid of a catalyst liquid and a hydrocarbon liquid is applied to the combustible particles collected by a particulate filter, and the catalyst and hydrocarbon liquid are applied to the surface of the combustible particles. As the ignition temperature of combustible particles can be significantly lowered by uniformly depositing the combustible particles, combustible particles can be completely combusted even in the normal operating range of diesel engines, etc., where the exhaust gas temperature is low. , combustible particles can be reliably removed.

(Example) Hereinafter, an example as a specific example of the technical means of the present invention will be described with reference to the drawings.

Figure 1 shows a first embodiment in which the present invention is applied to a four-cylinder diesel engine. 1 is a diesel engine, 2 is an intake passage for supplying intake air to the engine 1, and 3 is an Xr
This is an exhaust passage that exhausts exhaust gas from the engine.

4 is a particulate filter 4 interposed in the middle of the JJr air passage 3;
Of these, 815 is partitioned into a number of passages by partition walls, and is a passage for collecting combustible particles such as 111 in the exhaust gas discharged from the engine 1. In the bubble C, an injector 5 is disposed on the -F flow of the L rate filter 4.

”-IIC1Q (Zr 5 is a tank 6 for storing a catalyst aqueous hydrocarbon emulsion, an injector 7 disposed with a spout facing upstream of the particulate filter 4, and the tank 6 and injector 7. a communication pipe 8 connecting the communication pipe 8; a pump 9 interposed in the communication pipe 8;
Although not shown, the pump 9'a is turned on when detecting that the back L' of the engine 1 has reached a predetermined value that is said to have an adverse effect on the operating performance of the engine 1, and is equipped with a sensor that turns on the pump 9'a. Enciso 1171 i'='r Ii
'15 +1i U4rl C1l E 1. k l
1 and 1 pump q suck up the catalyst aqueous hydrocarbon emulsion in the tank 6 through the communication pipe 8, and inject it into a predetermined portion (
For example, 10 to 100 CC>4115 injection cycles are made.

- The composition of the hydrocarbon emulsion in catalyst aqueous solution 8 described in F is 0
．． 05-0.5% by weight of one or two pairs of platinum alloys ff
Aqueous solution of 1 (Pt, Pd, Rb, Ir) 11
1 compound, or 1 to 10% of one or two base metals (V', (11, Or, Fc, Ni, Mo, Ca
, 3a), a catalyst component consisting of a water-soluble salt of 10-
50% by weight of a hydrocarbon such as kerosene, light oil, heavy oil, alcohol, or ketone (oxygenated hydrocarbon), 1 to 10,000% surfactant to dissolve the hydrocarbon in water, and the remainder water. It is a mixture of these.

Further, a throttle valve 10 is disposed at the gathering portion of the intake passage 2, and is substantially half-closed in response to a detection signal from the sensor, thereby throttling and adjusting the amount of intake air.

Next, to explain the operation of the above embodiment, combustible particles in the IJI gas discharged from the Enonjin 1 as the engine 1 is operated are collected in the padiculate filter 4, and the particulate filters 1 to 4 When the back pressure of the engine 1 reaches a predetermined value or more due to clogging, the pump 9 of the injector 5 is turned ON by the sensor that detects this, and the catalyst aqueous solution is carbonized from the injector 7. Hydrogen emulsion is injected into the exhaust passage 3 upstream of the particulate filter 4 . The catalyst components and hydrocarbons that have been combined in advance in the emulsion are
The combustible particles are uniformly deposited on the surface of the combustible particles collected by the Padiki collate filter 4, and the catalyst component reacts with the combustible particles, and the hydrocarbons promote the combustion of the combustible particles. r of combustible particles.

Tue) 1□9; The mark will drop to, for example, 200'C, and J means the normal operating range of the diesel engine 1 where the exhaust gas temperature is low (for example, 300'C) - (
t) The combustible particles can be burned well and their removal can be ensured.

Furthermore, the above pump 9 is an ON product! ! ! At the same time, the throttle valve 10 closes approximately half-way, thereby restricting the amount of intake air, creating a lack of air in the combustion chamber and increasing the temperature of the 111 gas, thereby promoting the combustion of the combustible particles. I can do it. This also allows the injection amount of the catalyst aqueous hydrocarbon emulsion to be reduced, which saves consumption of expensive catalyst components and reduces engine operating costs. Further, by reducing the amount of quenched TR, secondary clogging of the buddy 4-ureate filter 6 due to catalyst components can be prevented. Furthermore, since the IJI gas flow rate is reduced by the intake throttle, the catalyst component adheres to the vicinity upstream of the PAB 1 route filter 6, and this gradually spreads downstream, so that the catalyst component and hydrocarbons are effectively There are also many advantages to using it.

FIG. 2 shows a second embodiment of the present invention, in which, in addition to the injector 5 described in the first embodiment, an injector 11 is disposed in the first stream of the particulate filler 4, and the pump 9 An aqueous solution of oxygen generating substances such as KC903, KMn20s, Na C9,03, etc. stored in a tank 13 is injected from an injector 11 upstream of a particulate filter 4 through a communication pipe 14 by a pump 12 that moves with the pump 12. It is. In this case, the above-mentioned oxygen generating substance decomposes due to exhaust heat and generates oxygen with oxidizing activity.
The acid Zi can further promote the combustion of 0J flammable particles. Furthermore, the tank 13 is made of material C that does not have oxidation resistance.
Since there is a risk that the tank 13 may be corroded by oxygen generating substances in the formed tube, it is necessary to form the tube with oxidation-resistant plastic or the like.

Furthermore, FIG. 3 shows a third embodiment of the present invention, in which, in addition to the 1IlII)J device 7 described in the first embodiment, the fuel injection system is equipped with This means that the engine is connected via the engine 15. Use the switching valve 17 to fill the high aroma fuel tank 19 with diesel oil in the diesel oil tank 18 using the switching valve 17. By switching to the 19 side, high aroma fuel is supplied to the engine 1 to increase combustible components such as CO gas in the semi-misfired V1 exhaust gas, thereby further promoting the combustion of combustible particles.
J, Shino Unishita.

In each of the above embodiments, the back pressure of the engine 1 is detected by the sensor, and the pump 9 is turned on when the back pressure reaches a predetermined value.
Although the pump 9 is operated in the N mode, it is also possible to operate the pump 9 in the ON mode when the operating time of the engine 1 reaches a predetermined time. Of course, the pump 94 may not be turned on automatically using the sensor, but may be turned on manually at any time.

Next, regarding a specific example (explanation), Ilz PL C9 is placed upstream of Ilz PL C9 with a catalyst liquid upstream of the bathychelate filter of a JJI suspended 2000 cc diesel engine. Composition of catalyst aqueous solution hydrocarbon fiber -
■- Inject the mullion (DJ, < 30 CG), and for the example of the present invention, the engine was operated at a constant rotational speed of 150 rpm with a negative thread 1'1 (not shown in Fig. 4). When the temperature of the particulate filter was measured, the results were as shown in Figure 5 for the comparative example and Figure 6 for the inventive example.
.

In Table 1, Figure 5, the solid line indicates the case when 1ljl of catalyst liquid was not used, and the broken line indicates the case when 1ljl of catalyst liquid was injected.
indicates the injection timing in case of injection. In the same figure, j,
Then, when the catalyst liquid was not injected, when the particulate filter temperature reached approximately 600°C, the temperature rose rapidly, indicating that 0 ■ combustion 1 + 1 particles were combusted at that time. On the other hand, when the catalyst dIi is injected, the padiculate filter temperature e is about 300'
It can be seen that when the temperature reaches C, the combustible particles are burned, and the ignition temperature of the combustible wax is lowered by the catalytic reaction of the catalyst liquid.

Furthermore, according to FIG. 6, the flame-resistant particles are burning when the temperature of Badicule 1 to filter reaches approximately 200°C, and F)! H￥! It can be seen that the aqueous hydrocarbon emulsion lowers the ignition temperature of combustible particles to as much as 1 J, resulting in ``C''. Therefore, when the exhaust temperature in the normal operating range is as low as about 200 to 300°C, such as in a diesel engine, Even if there are, the iJ flammable particles can be completely burned in this example.In addition, in Fig. 6, the arrow indicates the injection timing.
0

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, and FIG. 1 is a first embodiment of the present invention.
FIG. 2 is an overall schematic configuration diagram of the second embodiment, and FIG. 3 is an overall schematic configuration diagram of the third embodiment. FIG. 4 is an engine (1 Fig. 5 shows the filter temperature of the filter 1 of the comparative example, and Fig. 6 shows the filter temperature of the filter 1 of the example of the present invention. This is a diagram of Yuri. 1... Engine, 4... Particulate fill, ri... +171 QJ device. Figure 5 Figure 6 Elapsed time (min)

Claims (1)

[Claims] (11 IJI In this engine exhaust gas purification system, the gas system is equipped with a particulate filter that collects combustible particles, etc.) Catalytic liquid and hydrocarbon liquid are injected in a mixed manner upstream of the particulate filter. A chanter is provided (
] Carrot exhaust gas purification device.