JPS58180713A - Processing device of fine particle in exhaust of internal-combustion engine - Google Patents

Abstract

PURPOSE:To both extend a combustion cycle and perform easy combustion, by spraying water to fine particles seized by a filter and collectively condensing the particles to relax its blocking. CONSTITUTION:When exhaust pressure becomes a fixed value P1, an exhaust pressure sensor 10 detects the pressure of this value to feed a signal to a controller 15 and operate a pressing pump 9. The pump 9 feeds pressure air to the upper part of a water tank 7 to press down a level of water and jet water from a nozzle 6 via a water pipe 8 by a predetermined fixed time. The water atomized by action of the nozzle 6 adheres to wet fine particles seized by a filter 5, and the fine particles are collectively condensed to particles of high density to adhere a surface of mesh composition of the filter 5 and break a bridged condition coating a mesh of the filter finally eliminate a blocking condition and decrease exhaust pressure below P2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for treating particulates contained in the exhaust gas of an internal combustion engine, particularly a diesel engine. This invention relates to an iron particle processing device that lowers the pressure to extend combustion particles and makes it easier to burn fine particles. The exhaust gas of a diesel engine near the internal combustion engine contains fine particles mainly composed of carbon, and from the standpoint of preventing separation, it is necessary to A device has been proposed in which a heat-resistant filter made of metal or ceramic in the form of a three-dimensional mesh is installed to collect fine particles, and then the fL is burned and removed. The combustion means include a burner that uses fuel noise, an electric heater, etc. (for example, Japanese Patent Application Laid-Open No. 55-19934), or a method that increases the exhaust temperature by 1 ft by throttling the intake air with an engine intake throttling device (Japanese Patent Publication No. 55-57637). )and so on. However, since the combustion temperature of carbon, which is the main component of fine particles, is approximately 500°C or higher, it ignites and burns.
In order to maintain the engine's performance, the K requires a large-capacity battery, making it difficult to secure a heat source, and the t-th intake throttle, which increases the exhaust temperature, puts strain on the engine and makes running difficult. do. Furthermore, each time the filter becomes clogged, the fuel is returned to the fuel, which poses problems to the life of the filter and the durability of the entire device. The repeated combustion situation in this case is the second
As shown in the diagram! Next to the duck, -B' means that the clogging trench is cleared by combustion and the exhaust pressure decreases [T' is the combustion cycle.

This invention was made in order to solve the above-mentioned problem of clogging, and it relieves clogging by atomizing fine particles collected by a filter and agglomerating them, thereby reducing combustion. This lengthens the cycle and makes it easier to burn.

To explain this invention by way of an example, the exhaust particulate processing device l shown in FIG.
1 is provided with a particulate collecting filter 5 having a three-dimensional mesh pattern. Upstream of the filter 5, the nozzle 6 is connected to the lower part of the sealed water pipe 8 through a water pipe 8. The upper part of the water tank is connected to the pump 9 for air pressure.
h. In this case, the water tank 7 may be open to the atmosphere, and the wood pipe 8 may be provided with a water pressure pump. An air pipe 13 with one end open is provided in the exhaust pipe 3, and the other end is connected to an atmospheric air supply port/glue. Exhaust pressure t of exhaust pipe 3 - Exhaust pressure sensor 10 that comes out sideways is provided, power supply 11, press-in pump 9 air pump! 4 and an exhaust gas temperature increasing means 12 such as an intake throttle valve mechanism. When the exhaust pressure detected by the exhaust pressure sensor 10 reaches a predetermined pressure P+VC, the controller +5 drives the press-in pump 9' for a certain period of time using a timer switch or the like, and even after the press-in pump 9 stops driving, the exhaust pressure continues. When the pressure sensor I11 is higher than the pressure P2 which is set to be slightly lower than the pressure Pl, the exhaust external pressure means 12 and the air pump +4'j- are operated for a certain period of time.

The particle processing apparatus of the present invention having the above-mentioned structure operates as follows. When the engine 2 is operated, particulates mainly composed of carbon in the exhaust gas adhere to the collection filter 5, but they accumulate one after another until they become filthy and cover the mesh of the filter, clogging it and causing it to be discharged. The pressure is increasing. When the exhaust pressure reaches a constant value PIK, the exhaust pressure sensor 1o detects this and sends a signal to the controller 15 to activate the pressure pump 9. It is press-fitted and gushes out. The water that has become atomized by the action of the nozzle 6 is collected by the filter 5 and adheres to the f′L particles to moisten them, so the fine particles aggregate and become particles with a high Wj1.
The cross-linked state that adhered to the surface of the mesh structure of the filter 5 and covered the mesh of the filter is broken, the clogging state is eliminated, and the exhaust pressure i;jP! It goes down below. When the above operation is repeated as the engine is operated, the exhaust pressure that reached tjtPtc decreases, but high-density locust particles are accumulated on the surface of the filter mesh structure, and the exhaust pressure reaches Pl, causing water to be ejected. will not fall below P2.

When the exhaust pressure control unit 10 detects this condition, the control unit 10 operates the exhaust noise level increasing means 12, adjusts the operation mechanism tm such as intake throttling, and drives the %IC nitrous air pump f. 'Air is sent to the exhaust pipe 3 via #13. The fine particles collected by the filter 5 are aggregated at a relatively high density and adhere to the surface of the Kinjo mesh knitting, making it easy for heat to propagate between the particles. When air is supplied to the rising exhaust gas i1 section, ignition occurs relatively easily and complete combustion can be maintained.

And it is set in advance to match the time when combustion ends, and when a certain period of time has passed, the exhaust temperature is increased! At the same time, the temperature increase operation caused by the 20 actuation is canceled and the air supply from the air pipe +3 is also stopped, returning to the original normal operating state. The third button shows the state of the combustion cycle T according to the present invention. In the diagram, T shows the exhaust pressure drop due to BFi combustion, and Jl, Jz... show the reduction in exhaust pressure due to clearing of clogging by water spray. It's a cycle. @Compared to Figure 2, T>T'. The situation is such that the particulates collected by the filter are easily burned in the furnace by the jet of water, as shown in the experimental example shown in Figure 4.If the heating time is set to 2 hours, the particulates are combusted at each temperature g. It is as shown in the figure when it is expressed in terms of the reduced state sound charge ratio. Lines Xs and X2 when water is sprayed g correspond to lines Yl and Y2 when water is not sprayed for 1 m under the same conditions.

Since it acts as described above, the combustion cycle can be prolonged against clogging caused by particulates, and the combustion heater, burner, and its heat source can be By agitating the particulates, the particulate removal tube can be completely removed without the need for TS, and the loss of energy due to VC firing can be reduced, and the firing cycle can be extended to extend the life of the filter. This increases the durability of the entire device.

[Brief explanation of drawings]

Figure 1 is a particulate treatment device of the present invention, Figure 2 is a conventional combustion treatment system, Figure 3 is a diagram showing the combustion cycle of the device according to the present invention, and Figure 4 is a water jet S It is a line diagram showing the effect of.

Claims (1)

[Scope of Claims] A particle collection filter disposed in a case that is an enlarged part of an exhaust pipe of an internal combustion engine, a water jet nozzle provided on the upstream side thereof, and a supply of water that flows backwards. A means for introducing air into the pipe, an exhaust pressure sensor provided in the exhaust pipe, and a controller connected to an exhaust pressure sensor, the scissors controller detects a specific pressure of the exhaust pressure sensor. To do this, drive the pressure pump for a certain period of time, detect that the exhaust pressure after the pressure pump is stopped is equal to or higher than a specific pressure lower than the specific pressure, and then activate the exhaust temperature raising means and the air supply means. It has a mechanism that operates for a certain period of time.1.