KR102316701B1 - Exhaust Gas After treatment Device and Combine including the same - Google Patents

Abstract

An exhaust gas post-treatment device and a combine including the same are disclosed. Exhaust gas post-treatment device according to an aspect of the present invention, a Diesel Oxidation Catalyst (DOC) module for oxidizing and removing harmful substances contained in exhaust gas upstream of the reducing agent input module based on the exhaust gas flow, and the exhaust gas flow A POC (Partial Oxidation Catalyst) module disposed downstream of the reducing agent input module based on It includes an SCR (Selective Catalytic Reduction) module that removes nitrogen oxides in the exhaust gas mixed with ammonia introduced from the POC module downstream of the reducing agent input module based on the flow through a denitration reaction using a catalyst, the POC of the POC module The gist of the configuration is that the injection nozzle is installed inclined at the rear end of the reducing agent input module to face the front part to directly inject the urea water into the front part of the POC.

Description

Exhaust Gas After treatment Device and Combine including the same

The present invention relates to an exhaust gas post-treatment device, and more particularly, to an exhaust gas post-treatment device for physically collecting harmful components contained in exhaust gas, converting them into harmless components using a chemical reaction and discharging them, and a combine including the same.

The exhaust gas emitted through the combustion of fossil fuels to obtain heat and power contains NOx, which has been identified as a causative agent of photo smog, acid rain, and respiratory diseases. Accordingly, in response to these NOx component emission regulations, SCR (Selective Catalytic Reduction) technology using ammonia as a reducing agent has been variously applied.

The conventional exhaust gas post-treatment device to which SCR technology is applied for NOx denitration in exhaust gas injects urea water dissolved in a storage tank into a reaction chamber, converts urea water into ammonia in the reaction chamber, and uses a catalyst inside the reactor It adopts a structure that achieves optimum denitrification efficiency by denitrifying NOx components and effectively prevents environmental pollution caused by NOx components or ammonia.

However, in such a conventional exhaust gas post-treatment device, the length of the reaction chamber becomes longer or the fan has to be secured enough time and distance to be uniformly mixed with the exhaust gas in the reaction chamber in order to convert the urea water into ammonia. (fan), a separate mixing auxiliary means had to be applied, and as a result, there is a problem in that the overall facility is inevitably enlarged.

On the other hand, unlike other agricultural vehicles, the combine, which is an agricultural harvesting device, is composed of various devices such as a harvesting device, a threshing device, a sorting device, and a grain tank, so that the overall configuration is very complicated. Therefore, there is a problem in that a large spatial limitation follows in applying the exhaust gas post-treatment device, which has been enlarged in response to the strengthened exhaust gas emission regulation, to the combine.

In consideration of the spatial problem, a technique for attaching an exhaust gas post-treatment device to the upper part of the threshing device has been proposed, but due to the characteristics of the post-treatment device that oxidizes harmful substances in a high-temperature environment, adsorbs and burns them, it can be installed on the upper part of the threshing device. In this case, since it is difficult to maintain the surrounding environment as a high-temperature environment, there is a problem in that the purification treatment performance of the exhaust gas post-treatment device cannot be effectively exhibited.

In addition, in the conventional general combine, the exhaust pipe for discharging the exhaust gas finally purified is disposed at the bottom of the gas frame and configured to face the ground, so there is a risk of fire due to the high temperature exhaust gas, and the exhaust discharged to the bottom of the gas As some of the gas is re-introduced into the engine, a structural problem in which the combustion efficiency and performance of the engine is lowered is also pointed out.

Korean Patent Registration No. 10-1383245 (Registration Date 2014. 04. 02)

The problem to be solved by the present invention is to increase the overall size of the post-treatment device or to secure sufficient time and distance for urea water to be evenly mixed with exhaust gas without a separate mixing auxiliary means such as a fan An object of the present invention is to provide an exhaust gas after-treatment device of

Another problem to be solved by the present invention is to effectively utilize the limited space of the combine and apply the exhaust gas exhaust gas post-treatment device with the performance enough to satisfy the strengthened exhaust gas regulations without major design changes to the combine would like to

In addition, it is an object of the present invention to provide a combine capable of preventing fire caused by high-temperature exhaust gas in advance by extending an exhaust pipe for discharging the final filtered exhaust gas into the atmosphere above the gas.

According to one aspect of the present invention as a means for solving the problem,

a reducing agent input module having an injection nozzle for injecting urea water into the exhaust gas;

a Diesel Oxidation Catalyst (DOC) module for oxidizing and removing harmful substances contained in the exhaust gas upstream of the reducing agent input module based on the exhaust gas flow;

A POC (Partial Oxidation Catalyst) module disposed downstream of the reducing agent input module based on the exhaust gas flow and reacting the urea water injected in the exhaust gas with the exhaust gas to extract ammonia and filtering particulate matter contained in the exhaust gas; ;

A Selective Catalytic Reduction (SCR) module for removing nitrogen oxides in the exhaust gas mixed with ammonia introduced from the POC module downstream of the reducing agent input module based on the exhaust gas flow through a denitration reaction using a catalyst;

The injection nozzle is inclined at the rear end of the reducing agent input module to face the POC front portion of the POC module, and provides an exhaust gas post-treatment device, characterized in that the urea water is directly injected into the POC front portion.

Here, the DOC module, the reducing agent input module, and the POC module may be arranged in a straight line, and the SCR module may be vertically connected to the POC module.

In addition, an exhaust pipe for discharging the exhaust gas that has undergone the final purification process into the atmosphere may extend upward from the outlet of the SCR module.

According to another aspect of the present invention as a means for solving the problem, the exhaust gas post-treatment device according to the one aspect; provides a combine comprising a.

Here, in the combine, the engine is mounted between the gas operation unit and the grain tank, and the exhaust gas post-processing device is disposed between the threshing and sorting device on one side of the gas and the grain tank on the other side of the opposite side, the exhaust gas post-treatment device The exhaust pipe may be extended from the SCR module to the upper side of the airframe.

Preferably, some of the components of the exhaust gas post-treatment device are mounted in a straight line along the longitudinal direction before and after the gas in the free space (S) below the inclined surface on the downstream side of the grain tank, and the rest between the threshing and sorting device and the grain tank A part may be installed vertically so as to follow the vertical height direction of the aircraft.

According to the exhaust gas post-treatment device according to an aspect of the present invention, urea water is directly injected on the front surface of the POC of the POC module and evenly mixed while passing through the inside of the POC, thereby increasing the size of the device or applying a separate mixing auxiliary means. It is possible to increase the efficiency of the conversion of urea water to ammonia as well as the uniform mixing of exhaust gas and urea water, thus improving the performance of the exhaust gas purification process as well as the miniaturization of the device.

In addition, the combine according to another aspect of the present invention has the advantage of mounting a post-treatment device having a processing performance sufficient to satisfy the exhaust gas regulation in the free space. In other words, there is a structural advantage in that there is an exhaust gas post-treatment device with sufficient processing performance to satisfy the strong exhaust gas regulation of Tier 4 level in the free space between the grain tank and the threshing/sorting device.

In addition, since the exhaust pipe for finally discharging the exhaust gas after the purification process is extended from the SCR module to the upper side of the gas, the exhaust gas can be prevented from re-introducing the engine, thereby improving the combustion efficiency of the engine, etc. It is possible to prevent the exhaust pipe from being flooded by this, and has the advantage of extremely reducing the risk of fire due to high temperature exhaust gas.

1 is a perspective view of an exhaust gas post-treatment device according to an aspect of the present invention;
2 is a side view of an exhaust gas post-treatment device according to an aspect of the present invention.
3 is an enlarged cross-sectional view of a main part of an exhaust gas post-treatment device according to an aspect of the present invention;
Figure 4 is a schematic side view showing a partial configuration of the combine according to another aspect of the present invention omitted.
Fig. 5 is a plan view of Fig. 4;
Figure 6 is a schematic view as viewed from the rear of the combine according to another aspect of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, detailed descriptions of well-known components will be omitted, and detailed descriptions of components that may unnecessarily obscure the gist of the present invention will be omitted.

Also, for convenience of explanation in describing the present invention, the exhaust gas inlet side of each module is defined as 'upstream' and the exhaust gas discharge side is defined as 'downstream' based on the exhaust gas flow. A direction that coincides with the direction in which the exhaust gas flows inside each module is defined as the 'axial direction', and a direction perpendicular to the 'axial direction' is defined as the 'radial direction'.

1 and 2 show a perspective view and a side view of an exhaust gas post-treatment device according to an aspect of the present invention.

1 to 2 , the exhaust gas post-treatment device 3 according to an aspect of the present invention includes a Diesel Oxidation Catalyst (DOC) module 30, a reducing agent input module 32 on the downstream side of the DOC module 30 ), and a DOC module 30 located downstream of the SCR (Selective Catalytic Reduction) module 36 and the reducing agent input module 32 and the POC (Partial Oxidation Catalyst) module 34 located between the SCR module 36. include

Based on the exhaust gas flow, the DOC module 30, the reducing agent input module 32, and the POC module 34 are arranged in a straight line sequentially from the engine side, and the SCR module 36 is the POC module 34 downstream. It is disposed perpendicular to the central axis of the POC module (34). In this case, the upstream of the DOC module 30 is connected to the exhaust side (exhaust manifold or turbocharger) of the engine, and the downstream side of the SCR module 36 is connected to an exhaust pipe 38 for discharging the exhaust gas after final purification to the outside. do.

The DOC module 30 oxidizes and removes hydrocarbons and carbon monoxide in exhaust gas using catalysts such as platinum (Pt) and palladium (Pd). The SCR module 36 reacts hydrolyzed ammonia with nitrogen oxide (hereinafter referred to as 'NOx') with urea water as a catalyst to convert it into nitrogen harmless to the environment (denitrification reaction). And particulate matter (hereinafter referred to as 'PM') in the exhaust gas is filtered through the POC module 34 located between the DOC module 30 and the SCR module 36 .

The DOC module 30 may have a configuration in which a diesel oxidation catalyst (DOC; Diesel Oxidation Catalyst, 300) formed by oxidizing a soluble organic material component by filling a honeycomb carrier with a catalyst is embedded in the casing 302, and the SCR module (36) may be a configuration in which a selective reduction catalyst (Selective Catalytic Reduction, not shown) coated with a special material such as molybdenum is embedded in a casing (not shown).

The POC module 34 includes a partial oxidation catalyst (340, hereinafter referred to as 'POC') consisting of a ceramic film having a predetermined wall thickness and a ceramic plug alternately formed on the outermost ceramic film and a cylindrical receptor ( 342), the reducing agent input module 32 is provided with an injection nozzle 320 for injecting urea water into the exhaust gas flowing toward the front end of the POC module 34.

An appropriate amount of urea water is injected and mixed in the exhaust gas according to the exhaust gas flow rate through the injection nozzle 320 of the reducing agent input module 32, and the number of urea injected into the exhaust gas and the exhaust gas are the POC module 34 As it passes through, a chemical reaction occurs that mixes evenly and converts it to ammonia. In addition, PM (Particulate Matter) in the exhaust gas is filtered through the POC module 34 .

The cylindrical receptor 342 of the POC module 34 surrounds the POC 340 and is directly connected to the discharge end of the reducing agent input module 32, PM is filtered through the POC module 34, and ammonia is included in the exhaust gas The mixed gas flows into the SCR module 36 . In the SCR module 36, NOx in the exhaust gas reacts with ammonia by the catalytic action of the selective reduction catalyst, and is converted into nitrogen harmless to the environment (denitrification reaction).

3 is an enlarged cross-sectional view of a main part of an exhaust gas post-treatment device according to an aspect of the present invention, and is an enlarged view of a POC module and a reducing agent input module.

3, the POC module 34 includes a POC 340 comprising a plurality of ceramic films 340a having a predetermined thickness and ceramic plugs 340b alternately formed on upper and lower ceramic films, and It includes a cylindrical receptor 342 surrounding the 340, and the reducing agent input module 32 is a straight pipe 322 connecting the DOC module 30 and the POC module 34, and the POC module 34 side. It includes a spray nozzle 320 that is inclined to the straight pipe portion 322 to face.

The injection nozzle 320 is inclined at a predetermined angle with respect to the central axis of the reducing agent input module 32 so that the reducing agent, that is, urea water (Urea) can be injected toward the center of the POC front part of the POC module 34. Therefore, the urea water injected through the injection nozzle 320 is directly injected into the front portion of the POC 340, and flows in a zigzag form by the ceramic plug 340b inside the POC 340 to be absorbed into the exhaust gas. mixed evenly.

In the POC 340, urea water in the exhaust gas is hydrolyzed to extract ammonia (NH3) to be used as a reducing agent in the denitrification reaction through the SCR module 36, and PM among harmful substances included in the exhaust gas is the POC ( 340) The internal exhaust gas flow, that is, the zigzag exhaust gas flow by the ceramic plug 340b alternately passes through the ceramic membrane 340a located in the center up and down while being filtered by the ceramic membrane and separated from the exhaust gas.

That is, the movement distance of urea water is increased and the reaction time is secured by the exhaust gas flow in the zigzag form inside the POC 340, so that the reducing agent (urea water) and the exhaust gas are evenly mixed and the conversion from urea water to ammonia is achieved. This can be done efficiently, and PM is filtered out of harmful substances contained in the exhaust gas by the exhaust gas flow that alternately passes up and down the ceramic membrane located in the center.

Reference numeral 343 denotes an end cover coupled to the end of the receptor 342 and to which a connector connecting the POC module 34 and the SCR module 36 is connected.

As such, in the exhaust gas post-treatment device according to an aspect of the present invention, urea water is directly injected on the front surface of the POC of the POC module and evenly mixed while passing through the inside of the POC, thereby increasing the size of the device or applying a reducing agent without applying a separate mixing auxiliary means. (Urea water) and exhaust gas can be mixed evenly and the conversion efficiency from urea water to ammonia can be increased, and thus, the efficiency of the exhaust gas purification treatment can be improved along with the miniaturization of the device.

Next, a combine equipped with an exhaust gas post-treatment device according to an aspect of the present invention will be described.

Figure 4 is a schematic side view showing a partial configuration of the combine according to another aspect of the present invention is omitted, Figure 5 is a plan view according to Figure 4. And Figure 6 is a schematic view looking at the rear of the combine according to another aspect of the present invention.

4 to 6, the combine according to another aspect of the present invention is provided with a gas operation unit 7, a grain tank 9, a threshing and sorting device 8 disposed next to the grain tank 9 do. The engine 10 is arranged horizontally so as to follow the left and right width direction of the gas between the gas manipulation unit 7 and the grain tank 9, and between the threshing and sorting device 8 and the grain tank 9, one of the present invention The exhaust gas aftertreatment device 3 along the side is arranged.

The exhaust pipe 38 extending from the discharge end of the SCR module 36 constituting the exhaust gas post-treatment device 3 extends to the upper part of the gas along the space between the threshing and sorting device 8 and the grain tank 9 . and the exhaust port is configured to face the rear of the gas, and the upstream of the DOC module 30 constituting the exhaust gas aftertreatment device 3 is the exhaust side (exhaust manifold or turbocharger) of the engine 10 and the 31) is connected.

Accordingly, the exhaust gas generated by driving the engine 10 flows into the exhaust gas post-treatment device 3 through the pipe 31 , and the DOC module 30 constituting the exhaust gas post-treatment device 3 . ) through a series of purification treatments such as oxidation of harmful substances, PM removal through the POC module 34, and denitrification reaction through the SCR module 36 through the exhaust pipe 38 in a state in which harmful substances are extremely reduced. It is released into the atmosphere above the gas.

In the installation of the exhaust gas post-treatment device 3, preferably, the free space (S) formed below by the downstream side inclined surface (90) of the grain tank (9) as shown in FIG. 6 is utilized. That is, a free space (S) is formed by the inclined surface in the lower portion of the grain tank (9) on the side facing the threshing and sorting device (8), and the configuration of the exhaust gas post-treatment device (3) in this free space (S) It can be mounted so that a part of the element is located.

Here, some of the components constituting the exhaust gas post-treatment device 3 may be a linearly connected DOC module 30, a reducing agent input module 32, and a POC module 34, and these modules 30, 32 ( 34) may be installed in a straight line along the longitudinal direction of the body in the free space (S).

Unexplained reference numeral 14 denotes a gas frame, and 110 and 115 denote an intercooler and an oil cooler, respectively. And 116 and 118 refer to a fuel tank for accommodating fuel and a urea water tank for storing urea water (Urea) to be supplied as a reducing agent to the exhaust gas post-treatment device, respectively.

According to another aspect of the present invention, the structure is equipped with an exhaust gas post-treatment device having a processing performance sufficient to satisfy the strong exhaust gas regulation of Tier 4 level in the free space between the grain tank and the threshing/sorting device. There are advantages. That is, it is possible to provide a combine with a treatment performance sufficient to satisfy exhaust gas regulations by effectively utilizing the free space.

In the above detailed description of the present invention, only specific embodiments thereof have been described. However, it is to be understood that the present invention is not limited to the particular form recited in the detailed description, but rather, it is to be understood to cover all modifications and equivalents and substitutions falling within the spirit and scope of the present invention as defined by the appended claims. should be

3: exhaust gas post-treatment device 30: DOC unit
32: reducing agent input unit
34: POC unit 36: SCR unit
320: injection nozzle 322: straight pipe part
340: POC 342: receptor
7: gas operation unit 8: threshing and sorting device
9: grain tank 10: engine
14: Airframe frame

Claims (7)

a reducing agent input module having an injection nozzle for injecting urea water into the exhaust gas;
a Diesel Oxidation Catalyst (DOC) module for oxidizing and removing harmful substances contained in the exhaust gas upstream of the reducing agent input module based on the exhaust gas flow;
A POC (Partial Oxidation Catalyst) module disposed downstream of the reducing agent input module based on the exhaust gas flow and reacting the urea water injected in the exhaust gas with the exhaust gas to extract ammonia and filtering particulate matter contained in the exhaust gas; ;
Based on the exhaust gas flow, a SCR (Selective Catalytic Reduction) module for removing nitrogen oxides in the exhaust gas mixed with ammonia introduced from the POC module downstream of the reducing agent input module through a denitration reaction using a catalyst; includes;
The injection nozzle is inclined at the rear end of the reducing agent input module to face the POC front portion of the POC module, and the urea water is directly injected into the POC front portion by the injection nozzle,
The POC module comprises a partial oxidation catalyst (POC) composed of a plurality of membranes having a predetermined wall thickness and plugs formed on the outermost membrane alternately up and down.
The method of claim 1,
The DOC module, the reducing agent input module, and the POC module are arranged in a straight line, the exhaust gas post-treatment device, characterized in that the SCR module is vertically connected to the POC module.
delete delete The combine comprising; the exhaust gas post-treatment device according to claim 1 .
delete delete

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