CN109420430A

CN109420430A - Catalyst type filter element

Info

Publication number: CN109420430A
Application number: CN201710785419.6A
Authority: CN
Inventors: 游素月
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-09-04
Filing date: 2017-09-04
Publication date: 2019-03-05

Abstract

The present invention relates to a filter element, in which a plurality of air inlet channels and a plurality of air outlet channels are formed on a carrier. The carrier has a first end face and a second end face, and a plurality of pores are distributed in the portion of the carrier between the first and second end faces. These air outlet channels separate all the air inlet channels, so that the air inlet and air outlet channels can only communicate with each other through the pores. Each oxidation catalyst layer is attached to the wall of the carrier surrounding the air inlet channel, and each reduction catalyst layer is attached to the wall of the carrier surrounding the air outlet channel. When the filter element is arranged in an exhaust gas emission system, the inlet of the air inlet channel faces the exhaust gas flow direction. The oxidation catalyst layer produces an oxidation reaction on the exhaust gas, and the oxidized gas is reduced to harmless gas by the reduction catalyst layer filter element, which relatively improves the quality of environmental protection.

Description

Catalyst filter core

Technical field

The present invention relates to the field of purification of exhaust gas, particularly relate to a kind of catalyst filter core.

Background technique

Exhaust gas is the product after burning, is common in the boiler of vapour (machine) vehicle or power plant, factory, becomes the misfortune source of pollution air One of.Fine particle containing compounds such as a large amount of carbon, sulphur in exhaust gas, and the ignition temperature the high more is also easy to produce, it is right Air quality causes serious pollution.

Summary of the invention

It is constructed the purpose of the present invention is to provide a kind of using redox, so that filter core is purified most of in exhaust gas Harmful substance, the catalyst filter core of the opposite quality for promoting environmental protection.

In order to achieve the above objectives, filter core of the invention includes:

Carrier has first end face, second end face and several holes, these holes are in carrier between first end face and second Position between end face；

Several inlet channels, these inlet channels are axially formed in carrier, and each inlet channel has entrance and closing Portion, first end face of the entrance by carrier, second end face of the closure adjacent to carrier；

Several outlet passageways, these outlet passageways are axially formed in carrier and separate whole inlet channels, each Outlet passageway has outlet and closure, which is led to by the second end face of carrier, the closure adjacent to the first end face of carrier It crosses hole and uses gas channel and inlet channel intercommunication；

Multiple oxidation catalyst layers, each oxidation catalyst layer attachment carrier surround the wall surface of inlet channel, do not block hole but； And

Multiple reducing catalyst layers, each reducing catalyst layer attachment carrier surround the wall surface of outlet passageway, do not block hole but.

When filter core configure in exhaust emission system, allow the inlet face of inlet channel to waste gas flow direction, the oxidation catalyst layer Oxidation reaction is generated to exhaust gas, which restores again effect.

In this way, catalyst filter core of the invention, purifies most of nuisance in exhaust gas with oxidation, two catalyst layers of reduction Matter, the opposite quality for promoting environmental protection.

Detailed description of the invention

For the core that technology is illustrated, hereby cooperate necessary schema, detailed description of the present invention construction, method or process are such as Under.

Fig. 1 is the perspective view of one preferred embodiment of filter core of the present invention.

Fig. 2 is schematic diagram of Fig. 1 filter core configuration in exhaust emission system.

Fig. 3 is the enlarged drawing of filter core part.

Appended drawing reference

10 carrier 11 of filter core

Hole 11a first end face 12

13 runner 14 of second end face

15 entrance 15a of inlet channel

Closure 15b, 16b outlet passageway 16

Export 16a

20 reducing catalyst layer 22 of oxidation catalyst layer

30 waste gas flow direction 32 of exhaust emission system

Net airflow is to 34

Specific embodiment

As shown in Figure 1, the filter core 10 has carrier 11, several runners 14 are formed inside the carrier 11, and surround in carrier 11 The wall surface of runner 14 arranges multiple oxidation catalyst layers and multiple reducing catalyst layers.

In the present embodiment, which is cylindrical body, possesses first end face 12 and second end face 13.The carrier 11 is to use violet The ceramic articles of green stone (Cordierite) production, therefore position of the carrier 11 between first end face 12 and second end face 13, Mostly it is distributed several hole 11a (see Fig. 3).

In some embodiments, which can be gengon, for example cuboid.

In Fig. 2,3, the runner 14 distinguishes two groups: one group of inlet channel 15 and one group of outlet passageway according to flow direction 16.Wherein, these inlet channels 15 extend certain depth along the axis direction of carrier 11, and 15 2 end of inlet channel is defined For entrance 15a and closure 15b.Entrance 15a passes through the first end face 12 of carrier 11, and closure 15b is adjacent to carrier 11 Second end face 13.

These outlet passageways 16 are also to extend certain depth along the axis direction of carrier 11, and by whole inlet channels 15 separate.Although each outlet passageway 16 has outlet 16a and closure 16b, orientation is totally different from inlet channel 15.It changes Sentence is talked about, and outlet 16a passes through the second end face 13 of carrier 11, and closure 16b is adjacent to the first end face 12 of carrier 11.Cause This, which can only communicate with each other with inlet channel 15 through hole 11a.

In addition, the oxidation catalyst layer 20 attachment carrier 11 surrounds the wall surface of inlet channel 15, hole 11a is not blocked but.Institute The reducing catalyst layer 22 stated adheres to the wall surface that carrier 11 surrounds outlet passageway 16, does not block hole 11a equally.

In figure, which is configured in exhaust emission system 30, such as exhaust pipe.In this way, the entrance of the inlet channel 15 15a faces waste gas flow direction 32, as outlet passageway 16 outlet 16a then against net airflow to 34.It puts it bluntly, exhaust gas is by filter core 10 It is filtered into clean gas outflow.

For example, 20 pairs of exhaust gas of the oxidation catalyst layer at least generate following oxidation reaction:

C_XH_Y+O₂→CO₂+H₂O

Moreover, carbon dioxide (CO₂) and water (H₂O) smaller to the harm of human body.

In addition to this, the reducing catalyst layer 22 is with titanium dioxide (TiO₂) be monomer, vanadium, tungsten, molybdenum metal oxide be Active matter, for example: vanadic anhydride (V₂O₅), tungstic acid (WO₃) and molybdenum trioxide (MoO₃) etc..

By taking vanadium system as an example, under the catalytic action of out of stock (abbreviation SCR) method of selective media reductive, restored with NO Effect generates harmless N₂And H₂O.Vanadium system active matter this moment is in reducing condition, then with the oxygen of air generate oxidation and Activity is kept, it can constantly and NO_XAnd NH₃Effect.In SCR reduction, it may occur however that reaction it is as follows:

4NO+4NH₃+O₂→4N₂+6H₂O

4NO+4NH₃+3O₂→4N₂O+6H₂O

2NO₂+4NH₃+O₂→3N₂+6H₂O

NO+NO₂+2NH₃→2N₂+3H₂O

Above narration and explanation is only the explanation of presently preferred embodiments of the present invention, and those skilled in the art are worked as can Make other modifications according to the above claim and above-mentioned explanation, only these modifications should be for creation of the invention Spirit and in interest field of the invention.

Claims

1. A catalytic filter element, comprising:

a carrier, which has a first end face, a second end face and a plurality of pores, and the pores are located at the position of the carrier between the first end face and the second end face;

a plurality of air inlet passages, the air inlet passages are axially formed in the carrier, each air inlet passage has an inlet and a closing portion, the inlet passing through the first end face of the carrier, and the closing portion is adjacent to the second end face of the carrier ;

a plurality of air outlet passages, these air outlet passages are axially formed on the carrier and separate all the air inlet passages, each air outlet passage has an outlet and a closed portion, the outlet passes through the second end face of the carrier, and the closed portion is adjacent to the On the first end face of the carrier, the air outlet channel is communicated with the air inlet channel through the pores;

a plurality of oxidation catalyst layers, each of which is attached to the carrier and surrounds the wall of the air inlet passage without blocking the pores; and

A plurality of reduction catalyst layers, each of which is attached to the carrier and surrounds the wall of the gas outlet channel, but does not block the pores.

2 . The catalytic filter element according to claim 1 , wherein the filter element is arranged in the exhaust gas discharge system, and the inlet of the intake passage is allowed to face the flow direction of the exhaust gas. 3 .

3. The catalytic filter element according to claim 1 or 2, wherein the oxidation catalyst layer at least produces the following oxidation reaction to the exhaust gas:

C _X H _Y +O ₂ →CO ₂ +H ₂ O.

4 . The catalytic filter element according to claim 3 , wherein, under the catalytic action of the selective catalytic reduction destocking method, the reduction catalyst layer performs reduction action with NO to generate N ₂ and H ₂ O. 5 .

5. catalyst filter core as claimed in claim 4 is characterized in that, in the reduction action of selective catalyst reduction destocking method, the reaction that can take place is as follows:

4NO+4NH ₃ +O ₂ →4N ₂ +6H ₂ O

4NO+4NH ₃ +3O ₂ →4N ₂ O+6H ₂ O

2NO ₂ +4NH ₃ +O ₂ →3N ₂ +6H ₂ O

NO+NO2 ₊ _2NH3 →2N2 ₊ _3H2O .

6 . The catalytic filter element according to claim 4 , wherein the reduction catalyst layer is composed of titanium dioxide, and metal oxides of vanadium, tungsten and molybdenum are active substances. 7 .