KR102421531B1 - 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 reducing agent input unit having an injection nozzle for injecting urea water into exhaust gas, and a chemical reaction for extracting ammonia by mixing the urea water and exhaust gas injected into the exhaust gas A POC (Partial Oxidation Catalyst) unit in which It is a gist of the configuration that the POC unit is arranged in a straight line on the downstream side of the reducing agent input unit, and the SCR unit is vertically arranged on the downstream side of the POC unit.

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, recently, in response to the NOx emission control, SCR (Selective Catalytic Reduction) technology using ammonia as a reducing agent has been variously applied.

The conventional exhaust gas post-treatment device for denitrifying NOx in the exhaust gas injects urea water dissolved in a storage tank into the reaction chamber to change the urea water into ammonia in the reaction chamber, and uses a catalyst inside the reactor to denitrate the NOx component to be optimal. It adopts a structure that obtains the denitrification efficiency of and effectively prevents environmental pollution caused by NOx components or ammonia.

However, in such a conventional exhaust gas post-treatment device, the length and length of the reaction chamber must be long or the fan (fan) must be sufficiently secured for the time and length for the urea water to be evenly mixed with the exhaust gas in the reaction chamber to convert the urea water into ammonia. ) must be provided with a separate mixing auxiliary means, and accordingly, there is a problem in that the entire facility for post-treatment of exhaust gas is inevitably enlarged.

Korean Patent 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 provide a combine in which an exhaust gas post-treatment device is mounted at a position that can promote the convenience of maintenance while effectively utilizing the limited space of the combine.

According to one aspect of the present invention as a means for solving the problem, a reducing agent input unit having an injection nozzle for injecting urea water into the exhaust gas; a POC (Partial Oxidation Catalyst) unit in which a chemical reaction for extracting ammonia by mixing the urea water injected into the exhaust gas and the exhaust gas occurs; a Selective Catalytic Reduction (SCR) unit in which a chemical reaction occurs in which nitrogen oxides contained in the mixed gas introduced from the POC unit are converted into nitrogen through a denitrification reaction with a catalyst; and a POC unit on the downstream side of the reducing agent input unit It provides an exhaust gas aftertreatment device, characterized in that it is arranged in this straight line, and the SCR unit is vertically arranged on the downstream side of the POC unit.

Here, the POC unit includes: a Partial Oxidation Catalyst (POC) for filtering PM (Particulate Matter) in the exhaust gas; a cylindrical receptor surrounding the POC; It includes; an end cover installed on one end of the receptor, a partition pipe is installed at the discharge end of the POC, and a flow path is formed between the partition pipe and the outer edge of the POC and the receptor.

In this case, the end cover may be configured to be convexly curved outward.

And, the receptor and the SCR unit are connected through a connection pipe connected to the upper portion of the peripheral surface of the receptor, and the connection pipe may be configured to communicate with the flow passage between the outer edge of the partition pipe and the POC and the receptor.

In addition, the DOC unit disposed upstream of the reducing agent input unit to oxidize and remove harmful substances contained in the exhaust gas; may further include.

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.

The combine according to another aspect of the present invention is arranged horizontally so that the engine follows the left and right width direction of the gas between the gas operation unit of the combine and the grain tank, and between the threshing and sorting device on one side of the body and the grain tank on the other side of the opposite side An exhaust gas post-treatment device is provided, and an exhaust pipe extending upward from the SCR unit discharge end of the exhaust gas post-treatment device may be configured to extend to the upper part of the gas along between the threshing and sorting device and the grain tank).

At this time, a free space (S) is formed below the inclined surface by the downstream inclined surface of the grain tank, and some components constituting 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. , the remaining part between the threshing and sorting device and the grain tank may be installed vertically along the vertical and vertical direction of the gas.

According to one aspect of the present invention, there is an advantage that it is possible to secure enough time and distance to promote even mixing of the reducing agent and the exhaust gas without increasing the size of the equipment or applying a separate mixing auxiliary means. It is possible to provide an exhaust gas after-treatment device having a satisfactory NOx reduction performance.

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

1 is a side view of an exhaust gas post-treatment device according to an aspect of the present invention;
Figure 2 is an enlarged perspective view of the main part (POC unit) of the exhaust gas post-treatment device according to an aspect of the present invention.
Fig. 3 is a lateral cross-sectional view of the main part shown in Fig. 2;
Fig. 4 is a longitudinal cross-sectional view of the main part shown in Fig. 2;
Fig. 5 is an operation state diagram of the main part shown in Fig. 2;
Figure 6 is a schematic side view showing a partial configuration of the combine according to another aspect of the present invention omitted.
Fig. 7 is a plan view of Fig. 6;
Figure 8 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 known configurations will be omitted, and detailed descriptions of configurations that may unnecessarily obscure the gist of the present invention will be omitted.

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

1 is a side view of an exhaust gas post-treatment device according to an aspect of the present invention.

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

Based on the exhaust gas flow, the DOC unit 30, the reducing agent input unit 32, and the POC unit 34 are arranged in a straight line sequentially from the engine side, and the SCR unit 36 is the POC unit 34 downstream side. to the POC unit 34 and is disposed perpendicularly. At this time, the upstream of the DOC unit 30 is connected to the exhaust side of the engine, and the downstream side of the SCR unit 36 is connected to an exhaust pipe 38 for discharging the exhaust gas that has been subjected to final purification to the outside.

The DOC unit 30 oxidizes and removes hydrocarbons and carbon monoxide in exhaust gas using catalysts such as platinum (Pt) and palladium (Pd), and the SCR unit 36 is a nitrogen oxide (hereinafter, 'NOx'). ), hydrolyzed ammonia is reacted with urea water as a catalyst to convert it to nitrogen harmless to the environment (denitrification reaction). And the POC unit 34 between the DOC unit 30 and the SCR unit 36 filters out PM in the exhaust gas.

The DOC unit 30 may be composed of 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 and a casing 302 surrounding the same. The unit 36 includes a selective reduction catalyst (Selective Catalytic Reduction, not shown) coated with a special material such as molybdenum and a casing (not shown) surrounding the same.

The POC unit 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), and the reducing agent input unit 32 is equipped with an injection nozzle 33 for injecting urea water into the exhaust gas flowing toward the front end of the POC unit 34.

An appropriate amount of urea water is injected into the exhaust gas in response to the exhaust gas flow rate through the injection nozzle 33 of the reducing agent input unit 32, and the urea water and the exhaust gas injected into the exhaust gas form the POC unit 34. As it passes, a chemical reaction occurs that mixes evenly and converts it to ammonia. In addition, the work of filtering PM (Particulate Matter) in the exhaust gas through the POC unit 34 is performed.

The cylindrical receiver 342 of the POC unit 34 surrounds the POC 340 and is directly connected to the discharge end of the reducing agent input unit 32, PM is filtered through the POC unit 34, and ammonia is contained in the exhaust gas. The mixed gas is introduced into the SCR unit (36). In the SCR unit 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.

FIG. 2 is an enlarged perspective view of the POC unit of the exhaust gas post-treatment apparatus according to an aspect of the present invention, and FIG. 3 is a lateral cross-sectional view of the POC unit shown in FIG. 2 . And FIG. 4 is a longitudinal cross-sectional view of the POC unit shown in FIG.

2 to 4 , the POC unit 34 includes a POC 340 including a plurality of ceramic films 340a having a predetermined thickness and ceramic plugs 340b alternately formed on the upper and lower ceramic films, and the POC. One side surrounding the 340 is closed and includes a cylindrical receptor 342 . A partition tube 346 is connected to the discharge end of the POC 340 , and the receptor 342 surrounds the POC and the partition tube 346 so that a predetermined space (flow passage 348 ) is formed therebetween.

That is, the diameter of the POC 340 and the partition tube 346 is the same, and the receptor 342 has a larger diameter than the POC 340 and forms a concentric structure with the POC 340, so that the partition tube 346 and A flow passage 348 is formed between the outer edge of the POC 340 and the receptor 342, and the connecting pipe 35 is radially connected to the upper peripheral surface of the receptor 342 on the opposite side of the partition tube 346 and Through this, the POC unit 34 and the SCR unit 36 are interconnected.

An end cover 343 is installed at one end of the receptor 342 to face the outlet of the partition pipe 346, and the mixed gas (exhaust gas mixed with urea water) exiting the POC 340 by the end cover 343. state) is reversed. The end cover 343 may have an outwardly convexly curved configuration, thus minimizing the flow resistance of the exhaust gas according to the direction change and forming a vortex during the direction change process, so that the mixture of urea water and exhaust gas is excellent. will increase significantly.

That is, as shown in the operation state diagram of FIG. 5 , the exhaust gas exiting the POC 340 and the partition pipe 346 collides with the end cover 343 and the flow direction is reversed due to the vortex generated within a short time. and urea water are evenly mixed, and the movement distance and reaction time of the mixed gas are secured long due to the flow passage 348, so that the hydrolysis of the urea water (the operation of extracting ammonia to be used as a reducing agent in the SCR unit) is performed efficiently. it can be

According to one aspect of the present invention having such a configuration, there is an advantage that it is possible to secure sufficient time and distance to promote even mixing of the reducing agent and exhaust gas without increasing the size of the equipment or applying a separate mixing auxiliary means, , it is possible to provide an exhaust gas after-treatment device having a compact and satisfactory NOx reduction performance.

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

6 is a schematic side view illustrating a partial configuration of a combine according to another aspect of the present invention omitted, and FIG. 7 is a plan view of FIG. 6 . And Figure 8 is a schematic view looking at the rear of the combine according to another aspect of the present invention. With reference to these drawings, the configuration of the combine including the exhaust gas post-treatment device according to the above-described aspect will be schematically looked at.

6 to 8, 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.

From the discharge end of the SCR unit 36 of the exhaust gas post-treatment device 3, the exhaust pipe 38 extends to the upper part of the gas along the space between the threshing and sorting device 8 and the grain tank 9, so that the outlet is It is configured to face the rear of the gas, and the upstream of the DOC unit 30 constituting the exhaust gas after-treatment device 3 flows through the exhaust side (exhaust manifold or turbocharger) of the engine 10 and the pipe 31 . connected

Accordingly, the exhaust gas generated by the engine 10 flows into the exhaust gas post-treatment device 3 through the pipe 31 , oxidation of harmful substances through the DOC unit 30 , and the POC unit 34 . Through a series of purification processes, such as PM removal through the exhaust system and denitrification reaction through the SCR unit 36, harmful substances are discharged into the atmosphere above the gas through the exhaust pipe 38 in a state in which the harmful substances are extremely reduced.

In the installation of the exhaust gas post-treatment device 3, preferably, the free space S formed under the downstream side inclined surface 90 of the grain tank 9 as shown in FIG. 8 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 DOC unit 30, a reducing agent input unit 32, and a POC unit 34 that are linearly connected, and these units 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 indicate 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 processing 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 invention as defined by the appended claims. should be

3: exhaust gas post-treatment device 30: DOC unit
32: reducing agent input unit 33: injection nozzle
34: POC unit 36: SCR unit
340: POC 342: receptor
343: end cover 346: septum
348: flow path
7: gas operation unit 8: threshing and sorting device
9: grain tank 10: engine
14: Airframe frame

Claims (8)

a reducing agent input unit having an injection nozzle for injecting urea water into the exhaust gas;
a POC (Partial Oxidation Catalyst) unit in which a chemical reaction for extracting ammonia by mixing the urea water injected into the exhaust gas and the exhaust gas occurs;
It includes; a Selective Catalytic Reduction (SCR) unit in which a chemical reaction occurs in which nitrogen oxides contained in the mixed gas introduced from the POC unit are converted into nitrogen through a denitrification reaction with a catalyst;
A POC unit is disposed in a straight line on the downstream side of the reducing agent input unit, and the SCR unit is disposed vertically on the downstream side of the POC unit,
The POC unit is
POC (Partial Oxidation Catalyst) that filters PM in exhaust gas,
A cylindrical receptor surrounding the POC, and
Including an end cover installed on one end of the receptor,
A partition pipe is installed at the discharge end of the POC, and a flow path is formed between the partition pipe and the outer edge of the POC and the receptor.
delete The method of claim 1,
The end cover is an exhaust gas post-treatment device, characterized in that forming a convexly curved configuration to the outside.
The method of claim 1,
The receptor and the SCR unit are connected through a connection pipe that is connected to the upper portion of the circumferential surface of the receptor opposite the compartment,
The connecting pipe is an exhaust gas post-treatment device, characterized in that communicated with the flow passage between the outer edge of the compartment and the POC and the receptor.
The method of claim 1,
The exhaust gas post-treatment device further comprising a; a DOC unit disposed upstream of the reducing agent input unit to oxidize and remove harmful substances contained in the exhaust gas.
A combine comprising a; the exhaust gas post-treatment device according to any one of claims 1 to 5.
7. The method of claim 6,
The engine is horizontally arranged so that the engine follows the left and right width direction of the aircraft between the aircraft operation part of the combine and the grain tank,
The exhaust gas post-treatment device is provided between the threshing and sorting device on one side of the gas and the grain tank on the other side of the opposite side,
An exhaust pipe extending upward from the SCR unit discharge end of the exhaust gas post-treatment device is a combine, characterized in that it extends to the upper part of the gas along between the threshing and sorting device and the grain tank.
8. The method of claim 7,
In the free space (S) below the slope of the downstream side of the grain tank, a part of the components of the exhaust gas post-treatment device is installed in a straight line along the longitudinal direction before and after the gas, and the remaining part between the threshing and sorting device and the grain tank is of the gas. A combine, characterized in that it is mounted vertically to follow the vertical height direction.

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