KR102252340B1 - Exhaust gas cleaning device - Google Patents

Abstract

An exhaust gas cleaning device according to an embodiment of the present invention comprises: a DOC mixing module which is connected to an engine of a vehicle, purifies an exhaust gas of the engine with a diesel oxidation catalyst, and mixes a reducing agent with the purified purification gas to generate a mixed gas; an SCR module arranged in parallel at a position adjacent to the DOC mixing module and secondarily purifying the mixed gas with a selective reduction catalyst; and a module connection tube which is provided to connect one end of the SCR module and the DOC mixing module and guides the mixed gas from the DOC mixing module to the SCR module. Inside the DOC mixing module, a mixing pipe for mixing the purification gas and the reducing agent can be provided long with a smaller cross-sectional area than a cross-sectional area of the DOC mixing module. A first mixing chamber for receiving and mixing the mixed gas mixed in the mixing pipe can be formed at one end of the DOC mixing module. A second mixing chamber for receiving and mixing the mixed gas introduced through the module connection pipe can be formed at one end of the SCR module. Therefore, the present invention can realize compactness and downsizing of the exhaust gas cleaning device.

Description

Exhaust gas purification device {EXHAUST GAS CLEANING DEVICE}

The present invention relates to an exhaust gas purifying apparatus, and more particularly, to an exhaust gas purifying apparatus capable of achieving compactness and miniaturization of an exhaust gas purifying apparatus by integrally forming a DOC unit and a mixing unit.

In general, an exhaust gas purification device is a device that removes harmful components contained in exhaust gas by treating exhaust gas generated from an internal combustion engine.

In recent years, regulations on exhaust gas emission have been strengthened due to deepening of global warming and air pollution. In particular, in the case of a diesel engine, a large amount of harmful particulates such as carbon monoxide, hydrocarbons, and nitrogen oxides are contained in exhaust gas due to incomplete combustion of fuel.

Accordingly, an exhaust gas purification device is installed in a machine equipped with an internal combustion engine such as a diesel engine to prevent harmful particulates and harmful substances of exhaust gas from being discharged to the atmosphere.

The exhaust gas purification apparatus as described above may be used in various ways depending on the fuel main component of the engine, combustion efficiency, engine shape, and the like. For example, a selective catalytic reduction (SCR) method using a reducing agent such as urea, a diesel oxidation catalyst (DOC) method, or an exhaust gas post-treatment (Diesel Particulate Filter (DPF) method) , NOx storage catalyst (Lean NOx Trap, LNT) method, etc. are used in various ways.

In particular, in automobiles, construction machinery, agricultural machinery, etc., in which diesel engines are used, there is a trend to further improve exhaust gas purification performance by combining various types of exhaust gas purification devices.

For example, as an exhaust gas purifying apparatus of a complex type, a typical apparatus for continuously purifying exhaust gas by connecting DOC (or DPF) and SCR with a mixing pipe is typical. Here, a mixing pipe for mixing after supplying a reducing agent to the exhaust gas may be connected between the DOC (or DPF) and the SCR.

However, in the conventional exhaust gas purification device of the complex type, since two or more purification devices are simply connected, the overall size of the exhaust gas purification device is very large, and the installation space is reduced due to the enlargement of the exhaust gas purification device. There was a disadvantage that it was difficult to secure.

In particular, in a construction machine such as an excavator, since it is structurally very difficult to secure a space for installing an engine or an exhaust gas purification device, research and development for simplification of components and improvement of performance of components are being actively conducted.

In recent years, in order to form an exhaust gas purifying apparatus in a compact and small size, the development of technologies for variously improving the connection structure or arrangement structure between DOC and SCR and urea mixing pipes has been actively made.

For example, in Korean Patent Registration No. 10-1251518 (name of the invention: dosing module for a vehicle exhaust gas post-treatment system, registration date: 2013.04.01), a reducing agent is injected from the front of the SCR along the flow direction of the exhaust gas. A dosing module for a vehicle exhaust gas aftertreatment system is disclosed. That is, after the dosing body of the dosing module is integrally formed at the tip of the DPF, it is connected to the tip of the SCR.

In addition, in Korean Patent Registration No. 10-1669657 (name of the invention: mixing device for SDPF, registration date: October 20, 2016), the mixing device for SDPF can be applied to an exhaust system in which the oxidation catalyst and the SDPF are arranged side by side while being arranged up and down. The device is disclosed. That is, in a state in which the oxidation catalyst and the SDPF are arranged side by side, the mixing device connects the opposite ends of the oxidation catalyst and the SDPF.

An embodiment of the present invention provides an exhaust gas purifying apparatus capable of achieving compactness and miniaturization of an exhaust gas purifying apparatus by forming a DOC unit and a mixing unit into one module and then connecting to an SCR module.

In addition, an embodiment of the present invention provides an exhaust gas purification apparatus capable of making the overall size small while significantly improving the mixing performance of exhaust gas and urea.

In addition, an embodiment of the present invention provides an exhaust gas purification apparatus capable of preventing a phenomenon in which a reducing agent is deposited and fixed according to a decrease in gas flow rate when the exhaust gas and the reducing agent are mixed.

According to an embodiment of the present invention, a DOC mixing module that is connected to an engine of a vehicle and purifies the exhaust gas of the engine with a diesel oxidation catalyst and mixes a reducing agent with the purified purified gas to produce a mixed gas, and the DOC mixing module An SCR module disposed in a position adjacent to and secondary purification of the mixed gas with a selective reduction catalyst, and provided to connect one end of the DOC mixing module and the SCR module, and the mixed gas is transferred to the SCR in the DOC mixing module. It provides an exhaust gas purification apparatus including a module connection pipe for guiding the module.

In the interior of the DOC mixing module, a mixing pipe for mixing the purifying gas and the reducing agent may be provided with a smaller cross-sectional area than the DOC mixing module.

A first mixing chamber for receiving and mixing the mixed gas mixed in the mixing pipe may be formed at one end of the DOC mixing module, and the mixing introduced through the module connection pipe at one end of the SCR module A second mixing chamber for receiving and mixing gas may be formed.

Preferably, the module connection pipe may be provided in a linear shape between the first mixing chamber and the second mixing chamber so as to connect the first mixing chamber and the second mixing chamber with the shortest distance.

The inlet part of the module connection pipe may be connected in communication with a part facing one end of the SCR module among the outer circumferential parts of the first mixing chamber, and the outlet part of the module connection pipe is the DOC mixing part among the outer circumferential parts of the second mixing chamber. It may be disposed to penetrate through a portion facing one end of the module.

Here, a swirl member is provided inside the first mixing chamber to guide the mixed gas discharged from the mixing pipe to the inlet of the module connection pipe after swirling along the inner periphery of the first mixing chamber. I can.

In addition, a perforated pipe member having a plurality of discharge holes formed at an outer circumference thereof may be connected to the outlet portion of the module connection pipe. One end of the perforated pipe member may be connected in communication with the outlet of the module connection pipe, and the other end of the perforated pipe member may be formed in a closed structure. In the perforated pipe member, the discharge holes may be disposed in a portion not facing the selective reduction catalyst so that the mixed gas is not immediately discharged toward the selective reduction catalyst.

Preferably, an inlet chamber for introducing and storing the exhaust gas of the engine may be formed at the other end of the DOC mixing module, and the purified gas purified by the SCR module is stored and discharged at the other end of the SCR module. A discharge chamber for can be formed.

A first exhaust pipe for guiding the exhaust gas of the engine to the inside of the inlet chamber may be disposed at an outer periphery of the inlet chamber, and a purification gas stored in the exhaust chamber may be externally provided at an outer periphery of the exhaust chamber. A second exhaust pipe for guiding may be disposed to pass therethrough.

Here, a perforated pipe member having a plurality of discharge holes formed on an outer circumference thereof may be connected to an outlet portion of the first exhaust pipe and an inlet portion of the second exhaust pipe, respectively. One end of the perforated pipe member may be connected in communication with an outlet portion of the first exhaust pipe or an inlet portion of the second exhaust pipe, and the other end of the perforated pipe member may be formed in a closed structure. In the perforated pipe member connected to the outlet of the first exhaust pipe, the exhaust holes may be disposed at a portion not facing the diesel oxidation catalyst so that the exhaust gas of the engine is not immediately discharged toward the diesel oxidation catalyst. In the perforated pipe member connected to the inlet of the second exhaust pipe, the discharge holes may be disposed at a portion facing the selective reduction catalyst so that the purified gas purified by the SCR module directly flows toward the inside of the second exhaust pipe. have.

In addition, the first exhaust pipe and the second exhaust pipe are different from each other along the circumference of the other end of the DOC mixing module and the SCR module based on the module connection pipe to avoid interference with the DOC mixing module or the SCR module. It may be provided to be inclined at a position rotated in the direction.

Preferably, the mixing pipe may be provided in a curved shape in the inner space of the DOC mixing module so as to increase the mixing distance between the purification gas and the reducing agent and reduce the overall size of the DOC mixing module.

The DOC mixing module includes a mixing module case in which the first mixing chamber and the inlet chamber are formed at both ends, a DOC unit disposed inside one side of the mixing module case and purifying the exhaust gas with the diesel oxidation catalyst, and the mixing It may include a mixing unit disposed inside the other side of the module case and including the mixing pipe for mixing the reducing agent with the purification gas to produce the mixed gas.

The mixing unit, the mixing pipe disposed in the space of the mixing module case formed between the DOC unit and the first mixing chamber and connected to the outlet in communication with the first mixing chamber, at the outlet of the DOC unit A gas inlet connected to the inlet of the mixing pipe and the outlet of the DOC unit to guide the discharged purified gas to the inlet of the mixing pipe, and a reducing agent supplier provided in the mixing pipe to inject the reducing agent into the mixing pipe And a gas mixer mounted inside the mixing pipe so as to be located behind the reducing agent supplier based on the flow direction of the purifying gas, and mixing the purifying gas and the reducing agent to produce the mixed gas.

Here, the inlet portion of the mixing pipe may be disposed at a position eccentric in one direction from the central axis of the mixing module case, and the outlet portion of the mixing pipe may be disposed at a position eccentric in the other direction from the central axis of the mixing module case. I can. The middle portion of the mixing pipe may be bent obliquely from an inlet portion of the mixing pipe toward an outlet portion of the mixing pipe.

Preferably, the reducing agent supply unit, a spray nozzle for injecting the reducing agent to the purification gas flowing along the interior of the mixing pipe, and formed to penetrate the middle portion of the mixing pipe and the mixing module case to install the spray nozzle. It may include a nozzle supporter, and a supporter frame provided in the mixing module case to stably support the nozzle supporter.

The injection nozzle is disposed in a direction in which the reducing agent is injected into the gas mixer, and the injection direction of the injection nozzle is inclined at a set angle in a direction opposite to the flow direction of the purification gas to compensate for a change due to the flow of the purification gas. Can be set.

A through hole may be formed in a portion of the mixing module case corresponding to the spray nozzle and the nozzle supporter.

The supporter frame may include a mounting cover part provided in a shape to cover the through-hole part and mounted on the mixing module case, and a supporter support part provided in the mounting cover part to surround and support the nozzle supporter. The mounting cover portion as described above may be detachably provided in the through hole to enable replacement and maintenance of the spray nozzle and the nozzle supporter through the through hole.

Preferably, the gas mixer is disposed in the middle portion of the mixing pipe and formed in a cylindrical shape having a diameter smaller than that of the mixing pipe so that a gap is formed between the inner surface of the mixing pipe, and the mixer housing A lattice blade disposed inside in a lattice shape and formed in parallel along the longitudinal direction of the mixing pipe, and a direction disposed at the rear of the lattice blade based on the flow direction of the mixed gas and crossing the longitudinal direction of the mixing pipe As a result, a plurality of mixer blades protruding alternately from the rear portion of the grid blade may be included.

The mixer blades may be formed to decrease from a central portion of the lattice blade to an edge of the lattice blade, or may be formed only at a central portion of the lattice blade.

An exhaust gas purification apparatus according to an embodiment of the present invention includes a DOC mixing module and an SCR module, and a module connection pipe connecting both, and a DOC unit and a mixing unit are provided in the DOC mixing module to provide a DOC unit and a mixing unit. Can be integrated into a single module, and compactness and miniaturization of the exhaust gas purification device can be realized. Accordingly, in this embodiment, the installation space of the exhaust gas purification device can be significantly reduced, thereby improving design freedom and marketability of the exhaust gas purification device.

In addition, since the exhaust gas purification apparatus according to the embodiment of the present invention has a structure in which the DOC unit and the mixing unit are directly connected in a line to the interior of the mixing module case, the DOC mixing module can be formed very compactly with a size similar to that of the SCR module. have.

In addition, the exhaust gas purification apparatus according to an embodiment of the present invention has a structure in which a DOC mixing module connected to the module connection pipe and a mixing chamber are provided at one end of the SCR module, so that the mixed gas flowing into the module connection pipe and the module connection Since the mixed gas discharged from the pipe is additionally mixed in the mixing chamber of the DOC mixing module and the SCR module, the mixing efficiency of the reducing agent and the purification gas delivered to the selective reduction catalyst of the SCR module can be maximized. Separation and adhering to the interior of the exhaust gas purification device can also be prevented in advance.

In addition, the exhaust gas purification apparatus according to an embodiment of the present invention not only does not arrange a reducing agent supply unit in the module connection pipe, but also sufficiently secures the mixing efficiency of the mixed gas in the mixing chamber and the mixing pipe, the length of the module connection pipe As short as possible, the DOC mixing module and the SCR module are arranged side by side at adjacent positions and then connected with a module connector, thereby further reducing the overall size of the exhaust gas purification device.

In addition, the exhaust gas purification apparatus according to the embodiment of the present invention has a structure in which a swirl member for swirling the mixed gas discharged from the mixing pipe is provided inside the first mixing chamber formed at one end of the DOC mixing module. By the gas swirl member, a vortex can be formed in a vortex shape along the inner circumference of the first mixing chamber, and accordingly, the mixing efficiency of the mixed gas discharged from the mixing pipe with the purifying gas and the reducing agent can be further improved.

In addition, since the exhaust gas purification apparatus according to the embodiment of the present invention has a structure in which a plurality of gas holes are formed on one side of the swirl member facing the outlet of the mixing pipe, the outlet of the mixing pipe is transferred to the first mixing chamber. As the leaked mixed gas collides with one side of the swirl member, a part of the reducing agent may be separated from the mixed gas, but the reducing agent is continuously discharged to the gas hole due to the flow pressure of the mixed gas. As a result, the problem of depositing and sticking can be prevented in advance.

In addition, the exhaust gas purification apparatus according to an embodiment of the present invention is provided in a mixing module case with a through hole for installing and maintaining a reducing agent supply in a mixing pipe, and the supporter frame is detachably disposed in a structure covering the through hole. Since it is a single structure, the nozzle supporter for installing and supporting the spray nozzle can be stably and firmly arranged in the mixing module case by the supporter frame, and accordingly, vibration and damage of the nozzle supporter can be prevented, resulting in poor spraying and supply of the spray nozzle. Errors can also be prevented in advance. In particular, in the present embodiment, since the supporter frame can be attached and detached, the installation work and maintenance work of the spray nozzle can be smoothly performed through the through hole even without disassembling the mixing module case.

In addition, the exhaust gas purifying apparatus according to an embodiment of the present invention has a structure in which a mixing pipe having a relatively small diameter is provided in the internal space of the DOC mixing module, so that a decrease in flow rate inside the mixing pipe is prevented when the purifying gas and the reducing agent are mixed. In addition, since the mixing pipe is arranged inside the DOC mixing module, the mixing pipe does not directly contact the outside air, so it is possible to smoothly prevent the temperature drop of the mixing pipe.

In addition, the exhaust gas purifying apparatus according to an embodiment of the present invention has a structure in which a mixing pipe is provided in a curved shape in the internal space of the DOC mixing module, so that the mixing distance between the purifying gas and the reducing agent is increased to increase the mixing efficiency of the purifying gas and the reducing agent. It can be increased, and the size of the DOC mixing module can be made small due to the curved structure of the mixing pipe, so that the overall size of the DOC mixing module can be reduced. Accordingly, in this embodiment, the mixing performance of the purification gas and the reducing agent can be maximized through the mixing pipe, and the internal structure of the mixing unit can be provided very compactly.

In addition, the exhaust gas purification apparatus according to an embodiment of the present invention has a structure in which a gas mixer is disposed inside the middle portion of the mixing pipe, and a gap of a predetermined size is formed between the gas mixer and the inner surface of the mixing pipe. In the process of passing through the gas mixer, the mixed gas may flow smoothly through a gap formed between the inner surface of the mixing pipe and the edge of the gas mixer. That is, in this embodiment, a phenomenon in which the flow velocity of the mixed gas is significantly lowered at the inner side of the mixing pipe and at the edge of the gas mixer can be prevented in advance, so that the reducing agent is separated from the mixed gas and the mixing pipe and the gas The problem of depositing and sticking to the mixer can also be prevented in advance.

In addition, in the exhaust gas purification apparatus according to an embodiment of the present invention, since the mixer blades of the gas mixer are formed less toward the edges of the lattice blades or are formed only at the center of the lattice blades, the process in which the mixed gas passes through the gas mixer. The flow rate of the mixed gas can be made uniform throughout the gas mixer, and in particular, it is possible to prevent the phenomenon that the reducing agent is deposited and adhered to the edge of the gas mixer adjacent to the inner side of the mixing pipe due to the decrease in the flow rate of the reducing agent.

1 is a front view showing an exhaust gas purification apparatus according to an embodiment of the present invention.
FIG. 2 is a view showing a partial internal view of the exhaust gas purification apparatus shown in FIG. 1.
3 to 5 are views each showing a state of the exhaust gas purification apparatus shown in FIG. 2 as viewed from different directions.
6 is a side view showing a first mixing chamber of the DOC mixing module shown in FIG. 2.
7 is a cross-sectional view showing a DOC mixing module of the exhaust gas purification apparatus shown in FIG. 1.
8 and 9 are views showing a mixing unit of the DOC mixing module shown in FIG. 7.
10 is a cross-sectional view showing a main part of the mixing unit shown in FIGS. 7 to 9.
11 is a view showing a cross section taken along line AA shown in FIG. 10.
FIG. 12 is a view showing the gas mixer shown in FIG. 10 viewed from the rear.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. The same reference numerals shown in each drawing indicate the same members.

1 is a front view showing an exhaust gas purification apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a view showing a partial internal view of the exhaust gas purification apparatus 100 shown in FIG. 1. 3 to 5 are views each showing a view of the exhaust gas purification apparatus 100 shown in FIG. 2 from a different direction, and FIG. 6 is a first mixing chamber of the DOC mixing module 110 shown in FIG. It is a side view showing 20).

1 to 6, the exhaust gas purification apparatus 100 according to an embodiment of the present invention includes a DOC mixing module 110, an SCR module 120, and a module connection pipe 130.

The DOC mixing module 110 and the SCR module 120 may be formed in an elongated cylindrical structure, and may be arranged side by side so as to be adjacent to each other as much as possible. The DOC mixing module 110 and the SCR module 120 as described above may be connected to each other by a module connector 130. The module connector 130 may be provided to connect one end of the DOC mixing module 110 and the SCR module 120 disposed to face each other so as to be able to communicate with each other.

For example, in this embodiment, since the module connection pipe 130 is formed in a straight pipe structure, the DOC mixing module 110, the SCR module 120, and the module connection pipe 130 may be connected to each other in a'c' shape as a whole. . Accordingly, the overall structure of the exhaust gas purification device 100 can be compactly provided with a smaller size, and the design freedom of the exhaust gas purification device 100 is improved, as well as the installation space of the exhaust gas purification device 100 It can also be easily secured.

The exhaust gas G discharged from the engine may be discharged to the outside of the vehicle along the exhaust line. In this case, the exhaust gas purification apparatus 100 may be disposed in communication with the exhaust line. The exhaust line of the vehicle as described above may be provided as a pipe guiding the exhaust gas G. Hereinafter, in the present embodiment, for convenience of description, it will be described that the exhaust line is divided into the first exhaust pipe 140 and the second exhaust pipe 150 with the exhaust gas purification apparatus 100 as the center. That is, the first exhaust pipe 140 may be provided to guide the exhaust gas G from the engine to the exhaust gas purification device 100, and the second exhaust pipe 150 is exhausted from the exhaust gas purification device 100 to the outside. It may be provided to discharge the gas (G).

Accordingly, the exhaust gas G of the engine may be first purified with the first purification gas G1 by the DOC mixing module 110, and the first purification gas G1 is the second purification gas G1 by the SCR module 120. It may be secondarily purified with the purification gas G2. The second purification gas G2 as described above is the result of the final purification of the exhaust gas G of the engine by the exhaust gas purification device 100, and is in a state in which pollutants causing environmental pollution have been removed. Can effectively cope with environmental regulations.

1 to 6, the DOC mixing module 110 of the present embodiment purifies the exhaust gas G of the engine with a diesel oxidation catalyst and then a first purifying gas G1 purified by the diesel oxidation catalyst. It is a device to make a mixed gas (G1+U) by mixing a reducing agent (U). One end of the DOC mixing module 110 may be connected in communication with one end of the SCR module 120 by a module connector 130, and the other end of the DOC mixing module 110 is provided by the first exhaust pipe 140. It can be connected to the vehicle's engine.

The DOC unit 114 and the mixing unit 116 may be disposed inside the DOC mixing module 110. The mixing unit 116 may be disposed inside the DOC mixing module 110 to be close to one end of the DOC mixing module 110, and the DOC unit 114 may be close to the other end of the DOC mixing module 110. It may be disposed inside the DOC mixing module 110.

For example, the DOC unit 114 and the mixing unit 116 may be arranged in a structure directly connected in a line inside the DOC mixing module 110. Here, the mixing unit 116 may be provided with a mixing pipe 200, which will be described later, for mixing the first purification gas G1 and the reducing agent U. The mixing pipe 200 may be provided with a smaller cross-sectional area than the DOC mixing module 110. The mixing pipe 200 as described above increases the mixing distance between the first purification gas G1 and the reducing agent U, and reduces the overall size of the DOC mixing module 110. It may be provided in a curved shape in the inner space. The mixing distance of the mixing pipe 200 corresponds to a length in which the mixing action of the first purification gas G1 and the reducing agent U occurs in the mixing pipe 200. On the other hand, the detailed configuration of the DOC mixing module 110 of the present embodiment will be described in detail again below.

At one end of the DOC mixing module 110, a first mixing chamber 20 for receiving and mixing the mixed gas G1+U mixed in the mixing pipe 200 may be formed, and the DOC mixing module 110 An inlet chamber 10 for introducing and storing the exhaust gas G of the engine may be formed at the other end of the. That is, in this embodiment, the first mixing chamber 20 and the inlet chamber 10 are arranged at both ends of the DOC mixing module 110 with the DOC unit 114 and the mixing unit 116 in the middle.

Here, the inlet chamber 10 may be connected to be in communication with the first exhaust pipe 140 so that the exhaust gas G of the engine (not shown) flows through the first exhaust pipe 140. That is, the first exhaust pipe 140 for guiding the exhaust gas G of the engine into the inlet chamber 10 may be disposed to pass through the outer circumference of the inlet chamber 10.

As shown in FIG. 5, the first exhaust pipe 140 has a predetermined angle along the circumference of the other end of the DOC mixing module 110 based on the module connection pipe 130 to avoid interference with the SCR module 120 ( It can be provided inclined at the position rotated by R1). Referring to FIG. 5, in this embodiment, the first exhaust pipe 140 is connected to a position rotated at a predetermined angle R1 in a counterclockwise direction along the circumference of the other end of the DOC mixing module 110, but the module connection It may be disposed to be inclined at an inclination angle of a predetermined angle R1 with respect to the tube 130.

A perforated pipe member 160 having a plurality of discharge holes 162 formed on the outer circumference thereof may be connected to the outlet of the first exhaust pipe 140 as described above. One end of the perforated pipe member 160 may be connected in communication with the outlet of the first exhaust pipe 140, and the other end of the perforated pipe member 160 may be formed in a closed structure. Accordingly, the exhaust gas G flowing along the first exhaust pipe 140 may be discharged in various directions into the inlet chamber 10 through the discharge holes 162 of the perforated pipe member 160, and the During the process, the exhaust gas G may be mixed inside the inlet chamber 10 and uniformly delivered to the DOC unit 114.

2, 3, and 5, the discharge holes 162 may be disposed only in a portion of the outer peripheral portion of the perforated pipe member 160 that does not face the DOC unit 114. On the other hand, the discharge blocking part 164 in which the discharge holes 162 are not formed may be formed at a part of the outer periphery of the perforated pipe member 160 that faces the DOC unit 114. By appropriately adjusting the arrangement positions of the discharge blocking unit 164 and the discharge hole 162 as described above, the discharge direction of the gas discharged from the discharge holes 162 of the perforated pipe member 160 can be appropriately changed. . For example, in the perforated pipe member 160 disposed in the first exhaust pipe 140, the exhaust gas G is directly discharged from the discharge hole 162 to the DOC unit 114 by the discharge blocking unit 164. Can be prevented. Therefore, in this embodiment, the exhaust gas G does not flow into the DOC unit 114 in an uneven state discharged from the perforated pipe member 160 as it is, and is uniformly discharged after being discharged into the inflow chamber 10. It may be introduced into the DOC unit 114 in a mixed state.

In addition, the first mixing chamber 20 may be connected in communication with the outlet portion 220 of the mixing pipe 200 to accommodate the mixed gas (G1 + U) discharged from the outlet portion 220 of the mixing pipe 200. have. On the outer periphery of the first mixing chamber 20, the module connection pipe 130 is provided to deliver the mixed gas G1+U accommodated in the first mixing chamber 20 to the second mixing chamber 30 of the SCR module 120. It may be connected to be in communication with the inlet portion 132. That is, the first mixing chamber 20 is a configuration that guides the mixed gas (G1+U) discharged from the outlet portion 220 of the mixing pipe 200 to the inlet portion 132 of the module connection pipe 130, An inlet portion 132 of the module connection pipe 130 may be connected to one side of the outer circumferential portion.

The first mixing chamber 20 as described above may be independently partitioned from the mixing unit 116 by the partition member 113 disposed inside one end of the DOC mixing module 110. A pipe hole (not shown) through which the outlet portion 220 of the mixing pipe 200 is disposed may be formed in the partition member 113. As an example, the partition member 113 is elongated in a cylindrical shape along the inner surface of the mixing module case 112 in the partition panel portion 113a that partitions the first mixing chamber 20, and the partition panel portion 113a. It may include an extended support panel portion 113b. The partition panel part 113a may be formed in a disk shape that divides the inner space of the mixing module case 112, and the support panel part 113b is the mixing module case 112 at the edge of the partition panel part 113a. It may be formed in a cylindrical shape elongated along the inner side of the.

2 to 4, 6 and 8, a swirl for swirling the mixed gas G1+U discharged from the mixing pipe 200 inside the first mixing chamber 20 The member 600 may be provided. The swirl member 600 swirls the mixed gas (G1+U) discharged from the mixing pipe 200 along the inner periphery of the first mixing chamber 20, and then the inlet of the module connection pipe 130 ( 132).

That is, the mixed gas G1+U discharged from the outlet 220 of the mixing pipe 200 is swirled in a vortex shape along the inner circumferential surface of the first mixing chamber 20 by the swirl member 600 After being made, it may be flowed to the module connector 130. Therefore, in the first mixing chamber 20, after sufficiently mixing the first purification gas G1 of the mixed gas G1+U and the reducing agent U, the SCR module 120 is passed through the module connection pipe 130. Because it is transmitted, the mixing efficiency of the first purification gas G1 and the reducing agent U can be further improved.

The swirl member 600 swirls the mixed gas (G1+U) discharged from the outlet 220 of the mixing pipe 200 inside the first mixing chamber 20 and guides it to the outlet 112b. As a member for forming the partition member 113, it may be disposed on the surface of the partition member 113 in a shape covering the pipe hole of the partition member 113. The swirl member 600 as described above may have an arc-shaped swirl guide passage P formed between the surfaces of the partition member 113. That is, the mixed gas (G1+U) can be swirled along the swirl guide passage P after being discharged from the outlet 220 of the mixing pipe 200, and in that state, in the swirl member 600 A vortex may be generated that is discharged and rotates along the inner periphery of the first mixing chamber 20. In addition, the swirl guide passage P is formed in an arc shape, but may be formed to be inclined in a direction away from the partition member 113. Therefore, the mixed gas (G1+U) can flow in the longitudinal direction of the DOC mixing module 110 toward the inlet 132 of the module connector 130 while swirling along the swirl guide passage P. I can.

Meanwhile, the swirl member 600 may be mounted on the partition panel portion 113a of the partition member 113, and may be disposed so that the portion in which the entrance of the swirl guide passage P is formed covers the pipe hole. A plurality of gas hole portions 610 may be formed at a portion facing the outlet portion 220 of the mixing pipe 200 at an inlet portion of the swirl guide passage P of the swirl member 600 as described above. Therefore, the mixed gas G1 + U discharged from the outlet 220 of the mixing pipe 200 is partially passed through the gas hole 610 and then the inlet 132 of the module connection pipe 130 Can be flowed into.

At this time, in this embodiment, since the mixed gas (G1+U) is discharged from the outlet portion 220 of the mixing pipe 200 and then directly contacts the swirl member 600, the reducing agent in the mixed gas (G1+U) Since there is a high possibility that a part of (U) is separated, the reducing agent (U) may be deposited and fixed at the entrance portion of the swirl guide passage (P). However, when the gas hole portions 610 are formed at the inlet portion of the swirl guide passage P, the swirl guide passage ( The reducing agent (U) deposited at the inlet portion of P) may be discharged through the gas hole portions 610 together with the mixed gas (G1+U).

1 to 5, the SCR module 120 of this embodiment purifies the mixed gas (G1+U) discharged from the DOC mixing module 110 with a selective reduction catalyst and then purifies by the selective reduction catalyst. This is a device for discharging the second purified gas G2 to the outside. One end of the SCR module 120 may be connected in communication with one end of the DOC mixing module 110 by a module connector 130, and the other end of the SCR module 120 may be connected to the second exhaust pipe 150. I can.

A reduction catalyst unit 122 on which a selective reduction catalyst is supported may be disposed inside the SCR module 120 as described above. A plurality of reduction catalyst units 122 may be continuously arranged from one end to the other end of the SCR module 120. The reduction catalyst unit 122 is a member that purifies exhaust gas using a selective catalytic reduction (SCR) method, and converts NO _X (nitrogen oxide) in the exhaust gas into nitrogen and water that are harmless to the human body by a catalytic reaction using urea. You can change it.

At one end of the SCR module 120, a second mixing chamber 30 for receiving and mixing the mixed gas G1+U introduced through the module connection pipe 130 may be formed, and the SCR module 120 A discharge chamber 40 for storing and discharging the second purified gas G2 purified by the SCR module 120 may be formed at the other end of the SCR module 120. That is, in this embodiment, the second mixing chamber 30 and the discharge chamber 40 are arranged at both ends of the SCR module 120 with the reduction catalyst unit 122 in the middle.

Here, the second mixing chamber 30 may be connected to the outlet portion 134 of the module connection pipe 130 to accommodate the mixed gas (G1+U) discharged from the outlet portion 134 of the module connection pipe 130. have. The outlet portion 134 of the module connection pipe 130 may be disposed to pass through the outer periphery of the second mixing chamber 30 so as to receive the mixed gas G1+U flowing along the module connection pipe 130. That is, the second mixing chamber 30 receives the mixed gas (G1 + U) discharged from the outlet 134 of the module connection pipe 130, mixes it again, and supplies it uniformly to the reduction catalyst unit 122. As a configuration, the outlet portion 134 of the module connection pipe 130 may be connected to one side of the outer circumferential portion. Accordingly, the mixed gas G1+U discharged into the second mixing chamber 30 through the module connection pipe 130 is uniformly mixed in the second mixing chamber 30 and then the reduction catalyst unit ( 122) can flow evenly.

In addition, the discharge chamber 40 is a second exhaust pipe 150 to discharge the second purification gas G2 purified by the DOC mixing module 110 and the SCR module 120 to the outside through the second exhaust pipe 150. It can be connected in communication with. That is, the second exhaust pipe 150 for guiding the second purification gas G2 stored in the discharge chamber 40 to the outside may be disposed at the outer periphery of the discharge chamber 40 to pass therethrough.

As shown in FIG. 5, the second exhaust pipe 150 has a predetermined angle along the circumference of the other end of the SCR module 120 with respect to the module connector 130 to avoid interference with the DOC mixing module 110. It can be provided inclined at the position rotated by R2). Referring to FIG. 5, in this embodiment, the second exhaust pipe 150 is connected to a position rotated at a predetermined angle R2 in a clockwise direction along the circumference of the other end of the SCR module 120, 130) may be arranged to be inclined at an inclination angle of a predetermined angle R2. Hereinafter, in the present embodiment, it is described that the first exhaust pipe 140 and the second exhaust pipe 150 are provided to be inclined at the same angle in opposite directions with respect to the module connection pipe 130, but is not limited thereto, and the exhaust gas purification It may be provided at various angles according to the design conditions and circumstances of the device 100.

As shown in FIGS. 2 to 5, a perforated pipe member 160 having a plurality of discharge holes 162 formed on the outer circumferential portion of the second exhaust pipe 150 may be connected to the inlet portion of the second exhaust pipe 150. Since the perforated pipe member 160 is formed in the same manner as the perforated pipe member 160 connected to the outlet of the first exhaust pipe 140 described above, a detailed description thereof will be omitted. However, the perforated pipe member 160 connected to the inlet portion of the second exhaust pipe 150 is positioned at the position of the discharge holes 162 compared to the perforated pipe member 160 connected to the outlet portion of the first exhaust pipe 140. There is a difference.

Specifically, in the perforated pipe member 160 connected to the inlet of the second exhaust pipe 150, the discharge holes 162 are disposed at a portion of the outer periphery of the perforated pipe member 160 facing the reduction catalyst unit 122. On the contrary, the discharge blocking unit 164 may be formed at a portion of the outer peripheral portion of the perforated pipe member 160 that does not face the reduction catalyst unit 122. That is, the perforated pipe member 160 connected to the inlet portion of the second exhaust pipe 150 is arranged in positions of the discharge holes 162 with respect to the perforated pipe member 160 connected to the outlet portion of the first exhaust pipe 140. It can be provided to face the opposite direction.

Therefore, the second purification gas G2 that has passed through the reduction catalyst unit 122 is the perforated pipe member 160 through the discharge holes 162 by the pressure flowing from the reduction catalyst unit 122 to the discharge chamber 40. ) Can be easily introduced into the interior. In addition, the second purifying gas G2 introduced into the perforated pipe member 160 passes through the perforated pipe member 160 by the flow pressure of the second purifying gas G2 to the discharge chamber 40. The problem of coming out again may be blocked by the discharge blocking unit 164.

1 to 5, the module connection pipe 130 of the present embodiment is a member that guides the mixed gas G1+U from the DOC mixing module 110 to the SCR module 120. The module connector 130 may be provided to connect one end of the DOC mixing module 110 and the SCR module 120. The module connector 130 as described above is a tubular member for guiding gas from the DOC mixing module 110 to the SCR module 120, and the first mixing chamber 20 and the SCR of the DOC mixing module 110 It may be provided in a linear shape between the first mixing chamber 20 and the second mixing chamber 30 so as to connect the second mixing chamber 30 of the module 120 with the shortest distance.

The inlet part 132 of the module connection pipe 130 may be connected to be in communication with a part facing one end of the SCR module 120 among the outer circumferential parts of the first mixing chamber 20, and the outlet of the module connection pipe 130 The unit 134 may be disposed to penetrate through a portion of the outer peripheral portion of the second mixing chamber 30 that faces one end of the DOC mixing module 110. A perforated pipe member 160 having a plurality of discharge holes 162 formed on the outer circumference thereof may be connected to the outlet 134 of the module connection pipe 130 as described above. Since the perforated pipe member 160 is formed in the same manner as the perforated pipe member 160 connected to the outlet portion of the first exhaust pipe 140 or the inlet portion of the second exhaust pipe 150 described above, a detailed description thereof will be omitted. do. However, the perforated pipe member 160 connected to the outlet portion 134 of the module connection pipe 130 is the same as the perforated pipe member 160 connected to the outlet portion of the first exhaust pipe 140. It may be provided to arrange the placement position.

Specifically, in the perforated pipe member 160 connected to the outlet portion 134 of the module connection pipe 130, the discharge holes 162 do not face the reduction catalyst unit 122 of the outer periphery of the perforated pipe member 160. The discharge blocking unit 164 may be formed at a portion opposite to the reduction catalyst unit 122 of the outer peripheral portion of the perforated pipe member 160, on the contrary.

That is, the perforated pipe member 160 connected to the inlet portion of the second exhaust pipe 150 is arranged in positions of the discharge holes 162 with respect to the perforated pipe member 160 connected to the outlet portion of the first exhaust pipe 140. It can be provided to face the opposite direction. Therefore, the mixed gas (G1+U) flowing along the module connection pipe 130 is discharged in various directions into the inside of the second mixing chamber 30 through the discharge holes 162 of the perforated pipe member 160. In the process, the mixed gas (G1+U) may be mixed inside the second mixing chamber 30 and uniformly delivered to the reduction catalyst unit 122. When the perforated pipe member 160 is disposed at the outlet portion 134 of the module connection pipe 130 as described above, the mixed gas (G1+U) is reduced to the reduction catalyst in the discharge hole 162 by the discharge blocking portion 164. Direct discharge to the unit 122 may be prevented, and after the mixed gas G1+U is sufficiently mixed in the second mixing chamber 30, it may be uniformly introduced into the reduction catalyst unit 122.

7 is a cross-sectional view showing the DOC mixing module 110 of the exhaust gas purification apparatus 100 shown in FIG. 1, and FIGS. 8 and 9 are a mixing unit 116 of the DOC mixing module 110 shown in FIG. 7 It is a view showing. 10 is a cross-sectional view showing a main part of the mixing unit 116 shown in FIGS. 7 to 9, FIG. 11 is a view showing a cross section taken along line AA shown in FIG. 10, and FIG. 12 is a gas shown in FIG. It is a view showing a state as seen from the rear of the mixer 500.

1, 2, 7 to 10, the DOC mixing module 110 according to an embodiment of the present invention, a mixing module case 112, a DOC unit 114, and a mixing unit 116 It may include.

The mixing module case 112 may be formed in a cylindrical shape for accommodating the DOC unit 114 and the mixing unit 116. A first mixing chamber 20 may be formed at one end of the mixing module case 112 so as to be adjacent to the mixing unit 116, and flow into the other end of the mixing module case 112 so as to be adjacent to the DOC unit 114 The chamber 10 may be formed. As shown in FIG. 7, an outlet 112b connected to the inlet 132 of the module connection pipe 130 may be provided at the outer periphery of the first mixing chamber 20, and the outer periphery of the inlet chamber 10 A suction port 112a through which the first exhaust pipe 140 is connected may be provided.

The DOC unit 114 is a device that purifies the exhaust gas G of the engine sucked through the first exhaust pipe 140 with a diesel oxidation catalyst, and is continuously disposed between the inlet chamber 10 and the mixing unit 116. I can. The inlet portion 114a of the DOC unit 114 may be disposed toward the inlet chamber 10, and the outlet portion 114b of the DOC unit 114 may be disposed toward the mixing unit 116. Therefore, the exhaust gas (G) of the engine flows from the inlet chamber 10 to the inlet portion 114a of the DOC unit 114 and is then first purified by the diesel oxidation catalyst disposed inside the DOC unit 114. In addition, the first purification gas G1 that has been primary purified by the diesel oxidation catalyst may be discharged to the mixing unit 116 through the outlet portion 114b of the DOC unit 114.

Here, the DOC unit 114 will be described as purifying the exhaust gas G using a diesel oxidation catalyst (DOC) method. That is, the DOC unit 114 can reduce carbon monoxide and hydrocarbons, burn particulate matter, and increase the ratio _{of NO 2 in exhaust gas by using a catalytic reaction with a diesel oxidation catalyst and high heat.} However, the present invention is not limited thereto, and may be replaced with a DPF unit of a Die Particulate Filter (DPF) type instead of the DOC unit 114.

The mixing unit 116 is a device that makes a mixed gas (G1+U) by mixing a reducing agent (U) with the first purification gas (G1), and is continuously between the DOC unit 114 and the first mixing chamber 20. Can be placed. Hereinafter, in the present embodiment, it is described that the reducing agent U is urea, but other types of reducing agents may be used depending on the design conditions and circumstances of the exhaust gas purification apparatus 100.

Here, the mixing unit 116 may be disposed in the space S formed inside the mixing module case 112. That is, the space portion S of the mixing module case 112 may be provided between the partition member 113 and the outlet portion 114b of the DOC unit 114. The mixing unit 116 as described above is a structure accommodated in the space part S of the mixing module case 112, and thermal insulation performance due to the air in the space part S existing between the mixing module case 112 Can be secured.

Hereinafter, a detailed configuration of the mixing unit 116 according to the present embodiment will be described in more detail.

1, 7 to 12, the mixing unit 116 of the present embodiment, a mixing pipe 200, a gas inlet 300, a reducing agent supply 400, and a gas mixer 500. I can.

Here, the mixing pipe 200 and the gas mixer 500 may be arranged in a structure accommodated in the space S of the mixing module case 112, and the reducing agent supply 400 is the mixing module case 112 and the mixing pipe It may be disposed in the mixing module case 112 and the mixing pipe 200 with a structure penetrating through 200.

In particular, in this embodiment, since the mixing pipe 200 and the gas mixer 500 are arranged in a structure accommodated in the space S of the mixing module case 112, the temperature of the mixing pipe 200 and the gas mixer 500 Can be stably maintained at the desired set temperature. Accordingly, the first purifying gas G1 can prevent an abnormal temperature decrease in the process of passing through the mixing pipe 200 and the gas mixer 500, and can prevent the temperature decrease of the first purifying gas G1. Accordingly, a decrease in the mixing efficiency of the first purification gas G1 and the reducing agent U and a decrease in the reaction efficiency of the SCR module 120 may be prevented in advance.

7 to 10, the mixing pipe 200 is a configuration for mixing the first purification gas (G1) and the reducing agent (U), accommodated in the space (S) of the mixing module case 112 It can be arranged in a structure that can be used. The mixing pipe 200 as described above may be formed in a tubular shape extending longer with a cross-sectional area smaller than that of the space S of the mixing module case 112. In addition, the mixing pipe 200 may be formed in a structure that is bent at least once in the space S.

As described above, when the mixing pipe 200 is formed to be bent while being accommodated in the space unit S, the length of the mixing pipe 200 increases, so that the first purification gas G1 and the reducing agent U are mixed. It is possible to increase the mixing distance to be formed, and to reduce the overall size of the DOC mixing module 110 compared to a structure in which the mixing pipe 200 is formed to be elongated in a linear shape.

Meanwhile, the inlet part 210 of the mixing pipe 200 is a part connected to the gas inlet part 300 and may be disposed adjacent to the outlet part 114b of the DOC unit 114, and the gas inlet part 300 ) Can be connected in communication. The inlet part 210 of the mixing pipe 200 may be disposed at a position eccentric in one direction from the central axis of the mixing module case 112.

In addition, the outlet portion 220 of the mixing pipe 200 is a portion connected to the first mixing chamber 20, may be disposed adjacent to the first mixing chamber 20, the first mixing chamber 20 It may be connected to be penetrated through the partition member 113 to partition. The outlet 220 of the mixing pipe 200 may be disposed at a position eccentric from the central axis of the mixing module case 112 in the other direction.

In addition, the middle portion 230 of the mixing pipe 200 may be bent obliquely from the inlet portion 210 of the mixing pipe 200 toward the outlet portion 220 of the mixing pipe 200. For example, the inlet part 210 and the outlet part 220 of the mixing pipe 200 may be formed horizontally along the length direction of the mixing module case 112 so as to be parallel to the central axis of the mixing module case 112. In contrast, the intermediate portion 230 of the mixing pipe 200 may be formed to be bent in various shapes between the inlet portion 210 and the outlet portion 220 of the mixing pipe 200.

The intermediate part 230 of the mixing pipe 200 as described above may be formed in at least one of a spiral shape, a diagonal shape, a wave shape, an arc shape, or a zigzag shape. Hereinafter, in the present embodiment, it will be described that the middle part 230 of the mixing pipe 200 is formed to be bent in a'S' shape between the inlet part 210 and the outlet part 220 of the mixing pipe 200. .

7 and 10, the inlet 210 of the mixing pipe 200 may be connected to the upper part of the gas inlet 300, and the outlet 220 of the mixing pipe 200 is It may be connected to the lower part of the partition member 113 so as to be symmetrical with the inlet part 210 of the mixing pipe 200 with respect to the central axis of the mixing module case 112. The middle part 230 of the mixing pipe 200 is bent downward from the inlet part 210 of the mixing pipe 200 and then extends obliquely toward the outlet part 220 of the mixing pipe 200, and then the mixing pipe It may be provided in a shape curved again in the upward direction toward the outlet portion 220 of the 200.

7 to 9, the gas inlet 300 is the inlet 210 of the mixing pipe 200 with the first purified gas G1 discharged from the outlet 114b of the DOC unit 114. ), it may be formed in a structure that connects the outlet portion 114b of the DOC unit 114 and the inlet portion 210 of the mixing pipe 200. At this time, the first purification gas G1 changes in the flow direction in the process of flowing from the outlet portion 114b of the DOC unit 114 along the gas inlet portion 300 to the inlet portion 210 of the mixing pipe 200 It can be mixed in a turbulent shape through.

The inlet of the gas inlet 300 may be connected in communication with the outlet 114b of the DOC unit, and the outlet of the gas inlet 300 may be connected in communication with the inlet 210 of the mixing pipe 200 . For example, since the outlet portion 114b of the DOC unit 114 is formed with a larger cross-sectional area than the inlet portion 210 of the mixing pipe 200, the gas inlet portion 300 is the outlet portion of the DOC unit 114 ( 114b) may be formed in a cone shape or a funnel shape in which the flow passage of the first purification gas G1 toward the inlet portion 210 of the mixing pipe 200 is reduced. In addition, since the inlet portion 210 of the mixing pipe 200 is disposed at an eccentric position in one direction, the cone-shaped or funnel-shaped gas inlet portion 300 is eccentric in one direction from the central axis of the mixing module case 112. It can protrude pointed towards the position.

7 to 10, the reducing agent supply unit 400 is a configuration for injecting the reducing agent (U) into the interior of the mixing pipe 200, the middle portion 230 of the mixing pipe 200 and the mixing module case 112 ) Can be disposed to penetrate. The reducing agent supply unit 400 as described above is in the inlet part 210 of the mixing pipe 200 to inject the reducing agent U into the first purification gas G1 introduced into the inlet part 210 of the mixing pipe 200. It may be disposed in the middle part 230 of the adjacent mixing pipe 200.

For example, the reducing agent supply device 400 according to the present embodiment may include a spray nozzle 410, a nozzle supporter 420, and a supporter frame 430.

Here, the injection nozzle 410 may inject the reducing agent U into the first purification gas G1 flowing along the inside of the intermediate part 230 of the mixing pipe 200. The reducing agent U may be injected into the first purification gas G1 flowing along the interior of the mixing pipe 200 in the state of fine droplets by the injection nozzle 410.

In addition, the nozzle supporter 420 may support the spray nozzle 410 by installing the spray nozzle 410. The nozzle supporter 420 may be formed to penetrate through the middle part 230 of the mixing pipe 200, and protrude from the middle part 230 of the mixing pipe 200 to penetrate the mixing module case 112 Can be arranged.

The nozzle supporter 420 as described above is a portion connected to the intermediate portion 230 of the mixing pipe 200 and the inlet portion 210 so that the injection direction B of the injection nozzle 410 faces the gas mixer 500 It can be formed to be inclined to. That is, the injection direction (B) of the injection nozzle 410 may be set by the nozzle supporter 420, and toward the gas mixer 500 disposed inside the middle part 230 of the mixing pipe 200 It may be formed in the direction of spraying the reducing agent (U).

Referring to the drawing of FIG. 10 as the center, in the present embodiment, the injection nozzle 410 adjusts the direction opposite to the flow direction of the first purification gas G1 to compensate for the change due to the flow of the first purification gas G1. It may be set to be inclined toward the set angle θ. That is, the injection direction B of the injection nozzle 410 may be formed to be inclined at a set angle θ from the center of the gas mixer 500 toward the inlet part 210 of the mixing pipe 200. Here, the virtual mixer center line (C) passing through the center of the gas mixer 500 is a virtual straight line corresponding to the central axis of the intermediate portion 230 of the mixing pipe 200, and the injection direction of the injection nozzle 410 ( B) is an imaginary straight line corresponding to the direction in which the reducing agent U is actually sprayed from the spray nozzle 410.

Specifically, since the first purification gas G1 flows from the inlet portion 210 of the mixing pipe 200 to the middle portion 230 of the mixing pipe 200, the reducing agent injected from the injection nozzle 410 ( U) may change the injection direction in a direction away from the inlet part 210 of the mixing pipe 200 due to the flow pressure of the first purification gas G1. Therefore, by forming the injection direction B of the injection nozzle 410 to be eccentric at a set angle θ toward the inlet 210 of the mixing pipe 200 from the mixer center line C, the first purification gas G1 ) Due to the flow pressure of the spray nozzle 410 may compensate for abnormal deformation of the spray direction of the spray nozzle 410, and thereby the reducing agent U of the spray nozzle 410 can accurately spray to the mixer center line (C).

In addition, the supporter frame 430 may stably support the nozzle supporter 420. The supporter frame 430 as described above is a configuration for reinforcing the rigidity of the reducing agent supply unit 400 and may be connected to the nozzle supporter 420 and the mixing module case 112. Accordingly, the supporter frame 430 may support the nozzle supporter 420 in a stable structure by the mixing module case 112.

In the mixing module case 112, a through hole (not shown) may be formed in a portion corresponding to the spray nozzle 410 and the nozzle supporter 420. When the through hole is formed in the mixing module case 112 as described above, installation and maintenance of the spray nozzle 410 and the nozzle supporter 420 can be smoothly performed through the through hole. In this case, the supporter frame 430 may be provided in a shape capable of covering the through hole, and may be detachably mounted on the through hole.

For example, the supporter frame 430 may include a supporter support 432 and a mounting cover 434.

The supporter support 432 may be formed in a cylindrical structure to surround and support the nozzle supporter 420. The supporter support part 432 as described above may be provided on the mounting cover part 434. Accordingly, the nozzle supporter 420 can be stably supported by the supporter support 432, and thus, the spraying direction of the spraying nozzle 410 can be stably maintained.

The mounting cover part 434 may be provided in a shape capable of covering the through hole and may be mounted on the mixing module case 112. The mounting cover 434 as described above may be mounted on the mixing module case 112 with a structure that seals the through hole, but it is preferable to be mounted on the mixing module case 112 with a structure that simply covers the through hole. That is, since the space S of the mixing module case 112 is not accommodated in the exhaust gas G, the first purification gas G1, or the mixed gas G1+U, only air is filled, so that the through hole is There is no need to apply a structure for sealing. Meanwhile, a part of the mounting cover 434 may be mounted to the partition member 113 and the mixing module case 112 by welding, bonding, fitting, locking, or fastening. Another portion of the mounting cover 434 may be provided with a seating portion 436 to be seated and coupled to an edge of the through-hole portion. The seating portion 436 may be integrally formed along the edge of the mounting cover portion 434.

7, 10 to 12, the gas mixer 500 is a configuration to make a mixed gas (G1 + U) by mixing the first purification gas (G1) and a reducing agent (U), mixing pipe ( It may be mounted inside the middle part 230 of 200). Since the gas mixer 500 as described above needs to be supplied with the reducing agent U in advance to the first purification gas G1, it is located at the rear of the reducing agent supply unit 400 based on the flow direction of the first purification gas G1. It is desirable.

For example, the gas mixer 500 according to the present embodiment may include a mixer housing 510, a lattice blade 520, and a mixer blade 530.

The mixer housing 510 may be formed in a cylindrical shape having a diameter smaller than that of the mixing pipe 200. The front and rear surfaces of the mixer housing 510 as described above may be provided to be open through which the first purifying gas G1 and the reducing agent U can pass. Here, a gap 502 may be formed between the mixer housing 510 and the inner surface of the mixing pipe 200. When the gap 502 is formed between the mixer housing 510 and the mixing pipe 200, the reducing agent U separated from the mixed gas G1+U of the first purification gas G1 and the reducing agent U is mixed. It is possible to prevent the pipe 200 and the gas mixer 500 from being deposited and adhered to the connection portion.

In general, when the flow rate and temperature of the mixed gas (G1+U) are lowered, the purification performance of the mixed gas (G1+U) by the reduction catalyst unit 122 of the SCR module 120 may decrease, and the reducing agent ( U) can be easily separated from the mixed gas (G1+U), deposited and fixed, and the flow path of the mixed gas (G1+U) may be blocked or narrowed due to the deposition and fixation of the reducing agent (U). have. In order to solve this, if the amount of the reducing agent (U) is increased to increase the purification performance of the SCR module 120, the cause of the accumulation and fixation of the reducing agent (U) remains as it is, so that the reducing agent (U) is deposited and fixed. This may be intensified, and the cost burden may be significantly increased due to an increase in the amount of the reducing agent (U).

By the way, the mixed gas (G1+U) is in contact with the inner surface of the mixing pipe 200 in the process of flowing along the mixing pipe 200, and the flow velocity at the inner surface of the mixing pipe 200 rather than the center of the mixing pipe 200 And the temperature can be lowered. However, since the gas mixer 500 is a structure disposed inside the middle part 230 of the mixing pipe 200, the gas mixer 500 acts as a structure to interfere with the flow of the mixed gas (G1+U) and mixes it. The flow rate and temperature of the gas (G1+U) can be further reduced. However, in this embodiment, the gap 502 is formed between the inner surface of the mixing pipe 200 and the mixer housing 510 of the gas mixer 500, so that the inside of the mixing pipe 200 is Gas flowing relatively slowly along the side may pass through the gas mixer 500 as it is through the gap 502 without directly interfering with the gas mixer 500.

The lattice blade 520 may be arranged in a lattice shape inside the mixer housing 510. The lattice blades 520 may be formed in parallel along the length direction of the mixing pipe 200. That is, the lattice blade 520 may guide the flow of the mixed gas G1+U in a direction parallel to the mixer center line C of the gas mixer 500. The lattice blade 520 of the gas mixer 500 as described above may make the mixed gas G1+U passing through the middle part 230 of the mixing pipe 200 into a laminar flow.

For example, the lattice blade 520 according to the present embodiment may include a horizontal lattice blade 522 and a vertical lattice blade 524.

Here, the horizontal grid blade 522 is a plate-shaped member disposed in the horizontal direction inside the mixer housing 510, and a plurality of horizontal grid blades 522 may be disposed to be spaced apart from each other at equal intervals in the vertical direction inside the mixer housing 510. have.

In addition, the vertical grid blades 524 are plate-shaped members disposed in a vertical direction inside the mixer housing 510, and a plurality of the vertical grid blades 524 may be disposed to be spaced apart from each other at equal intervals in the horizontal direction inside the mixer housing 510. have.

In the central portion of the lattice blade 520, square lattice holes made of horizontal lattice blades 522 and vertical lattice blades 524 may be formed, but a horizontal lattice blade 522 at the edge of the grid blade 520 Non-rectangular lattice holes made of fields, vertical lattice blades 524, mixer housing 510, and the like may be formed.

Particularly, a mixer fixing member 540 protruding outward from the mixer housing 510 may be provided on a part of the lattice blade 520. The mixer fixing member 540 as described above has a structure disposed to pass through the mixer housing 510 and may be mounted and fixed to the intermediate portion 230 of the mixing pipe 200 when the gas mixer 500 is mounted. As an example, the mixer fixing member 540 may be formed in a structure in which at least one of the horizontal lattice blades 522 or the vertical lattice blades 524 extends long, and a plurality of the mixer fixing members 540 are formed along the outer periphery of the lattice blades 520. Can be arranged to be spaced apart from each other.

The mixer blade 530 may be disposed at the rear portion of the grid blade 520 based on the flow direction of the mixed gas (G1+U). The mixer blades 530 may have a structure in which a plurality of mixer blades 530 protrude from the rear portion of the grid blade 520 in a direction crossing the length direction of the mixing pipe 200. The mixer blade 530 as described above may guide the mixed gas G1+U passing through the lattice blade 520 in different directions intersecting the mixer center line C of the gas mixer 500. Accordingly, the mixer blade 530 of the gas mixer 500 may make the mixed gas G1+U passing through the lattice blade 520 turbulent to further increase the mixing efficiency of the mixed gas G1+U.

Hereinafter, in the present embodiment, the mixer blade 530 is described as being formed on the rear portion of the horizontal grid blade 522, but is not limited thereto and is formed on the rear portion of the vertical grid blade 524 or the horizontal grid blade 522 It may be formed on both the rear portion of the and vertical grid blades 524.

For example, the mixer blade 530 according to the present embodiment may include a first mixer blade 532 and a second mixer blade 534.

Here, the first mixer blade 532 may protrude long from the rear portion of the horizontal grid blade 522 toward the rear. The first mixer blade 532 as described above may be formed to be inclined downward at a predetermined angle from the rear portion of the horizontal grid blade 522. Meanwhile, a plurality of the first mixer blades 532 may be disposed to be spaced apart from each other along the longitudinal direction of the horizontal grid blade 522.

In addition, the second mixer blade 534 may protrude long from the rear portion of the horizontal grid blade 522 toward the rear so as to be disposed adjacent to each other with the first mixer blade 532. The second mixer blade 534 as described above may be formed to be inclined upward at a predetermined angle from the rear portion of the horizontal grid blade 522. Meanwhile, a plurality of the second mixer blades 534 are disposed to be spaced apart from each other along the longitudinal direction of the horizontal grid blades 522, and may be disposed between the first mixer blades 532, respectively.

Meanwhile, the first mixer blades 532 and the second mixer blades 534 have rectangular grid holes formed by the grid blade 520 and non-rectangular formed by the grid blade 520 and the mixer housing 510. It may be disposed to correspond to the lattice holes of. That is, the first mixer blade 532 or the second mixer blade 534 may be formed in a shape arranged one by one at the rear of the lattice holes. Accordingly, the mixed gas G1+U passing through the lattice holes may flow downward by the first mixer blade 532 or upward by the second mixer blade 534.

As shown in FIG. 12, the mixer blades 530 are formed less from the center of the grid blade 520 to the edge of the grid blade 520, or are not formed at the edge of the grid blade 520 and are not formed at the edge of the grid blade 520. It can be formed only in the central portion of 520. Hereinafter, in the present embodiment, for convenience of explanation, it is described that the mixer blade 530 is not formed at the edge of the lattice blade 520, but the mixer blade ( The arrangement distribution of the 530) may be variously changed.

Here, the edge of the lattice blade 520 is a portion in which non-rectangular lattice holes are formed by the lattice blade 520 and the mixer housing 510, and the mixer blades 530 are not formed so that the mixed gas (G1+U) Flow can be made smoothly. The smooth flow zones D1, D2, D3, and D4 as described above may be formed on the upper, lower, left, and right portions of the lattice blade 520, respectively. That is, a first flow smooth region D1 may be formed on the upper portion of the lattice blade 520, a second smooth flow region D2 may be formed on the right side of the lattice blade 520, and the lattice blade ( A third smooth flow zone D3 may be formed on the left side of the 520, and a fourth smooth flow zone D4 may be formed below the lattice blade 520.

As described above, when the flow smooth zones (D1, D2, D3, D4) are formed at the edge of the lattice blade 520 of the gas mixer 500, the flow velocity and temperature of the mixed gas (G1 + U) are Abnormal deterioration at the edge of the lattice blade 520 connected to the mixer housing 510 can be prevented, whereby the reducing agent (U) is deposited and adhered to the edge of the lattice blade 520 This phenomenon can also be prevented. That is, the flow rate and temperature of the mixed gas (G1+U) may be increased as it approaches the mixer center line (C) of the gas mixer 500 in the process of passing through the middle part 230 of the mixing pipe 200, and mixing In the process of passing through the middle portion 230 of the pipe 200, the closer to the inner surface of the mixing pipe 200, the smaller may be.

As described above, the embodiments of the present invention have been described by specific matters such as specific components and limited embodiments and drawings, but these are provided only to help a more general understanding of the present invention, and the present invention is limited to the above embodiments. It is not, and a person having ordinary knowledge in the field to which the present invention pertains can make various modifications and variations from this description. Accordingly, the spirit of the present invention is limited to the described embodiments and should not be determined, and all things equivalent or equivalent to the claims as well as the claims to be described later belong to the scope of the inventive concept.

100: exhaust gas purification device
10: inlet chamber
20: first mixing chamber
30: second mixing chamber
40: discharge chamber
110: DOC mixing module
120: SCR module
130: modular connector
140: first exhaust pipe
150: second exhaust pipe
G: engine exhaust
G1: first purge gas
G2: second purge gas
U: reducing agent
G1+U: mixed gas
B: spray direction of the spray nozzle
C: mixer centerline

Claims (15)

A DOC mixing module connected to an engine of a vehicle, purifying the exhaust gas of the engine with a diesel oxidation catalyst and mixing a reducing agent with the purified purified gas to produce a mixed gas;
An SCR module disposed in parallel with the DOC mixing module and secondaryly purifying the mixed gas with a selective reduction catalyst; And
Includes; a module connection pipe provided to connect the DOC mixing module and one end of the SCR module, and guide the mixed gas from the DOC mixing module to the SCR module,
In the interior of the DOC mixing module, a mixing pipe for mixing the purification gas and the reducing agent is provided in a longer cross-sectional area than that of the DOC mixing module,
A first mixing chamber for receiving and mixing the mixed gas mixed in the mixing pipe is formed at one end of the DOC mixing module, and the mixed gas introduced through the module connection pipe is supplied at one end of the SCR module. A second mixing chamber for receiving and mixing is formed,
An inlet chamber for introducing and storing the exhaust gas of the engine is formed at the other end of the DOC mixing module, and an exhaust chamber for storing and discharging the purified gas purified by the SCR module is formed at the other end of the SCR module. And
A first exhaust pipe for guiding the exhaust gas of the engine to the inside of the inlet chamber is disposed to pass through the outer periphery of the inlet chamber, and the purged gas stored in the exhaust chamber is guided to the outside at the outer periphery of the exhaust chamber. The second exhaust pipe for is disposed to pass through,
Perforated pipe members having a plurality of discharge holes formed on an outer circumference thereof are connected to the outlet portion of the first exhaust pipe and the inlet portion of the second exhaust pipe, respectively,
One end of the perforated pipe member is connected in communication with an outlet portion of the first exhaust pipe or an inlet portion of the second exhaust pipe, and the other end of the perforated pipe member is formed in a closed structure,
In the perforated pipe member connected to the outlet of the first exhaust pipe, the discharge holes are disposed at a portion not facing the diesel oxidation catalyst so that the exhaust gas of the engine is not immediately discharged toward the diesel oxidation catalyst,
In the perforated pipe member connected to the inlet of the second exhaust pipe, the discharge holes are disposed at a portion facing the selective reduction catalyst so that the purified gas purified by the SCR module directly flows into the inside of the second exhaust pipe. Exhaust gas purification device characterized in that. The method of claim 1,
The module connection pipe is provided in a linear shape between the first mixing chamber and the second mixing chamber so as to connect the first mixing chamber and the second mixing chamber with a shortest distance,
The inlet part of the module connection pipe is connected in communication with a part facing one end of the SCR module among the outer circumferential parts of the first mixing chamber, and the outlet part of the module connection pipe is the DOC mixing module among the outer circumferential parts of the second mixing chamber. Exhaust gas purification apparatus, characterized in that disposed to penetrate through a portion facing the one end of the. The method of claim 2,
A swirl member is provided inside the first mixing chamber to guide the mixed gas discharged from the mixing pipe to the inlet of the module connection pipe after swirling along the inner periphery of the first mixing chamber. Exhaust gas purification device. The method of claim 2,
A perforated pipe member having a plurality of discharge holes formed on the outer periphery is connected to the outlet of the module connection pipe,
One end of the perforated pipe member is connected in communication with the outlet of the module connection pipe, and the other end of the perforated pipe member is formed in a closed structure,
The exhaust gas purification apparatus, wherein the discharge holes are disposed in a portion not facing the selective reduction catalyst so that the mixed gas is not immediately discharged toward the selective reduction catalyst in the perforated pipe member. delete delete The method of claim 1,
The first exhaust pipe and the second exhaust pipe are in different directions along the circumference of the other end of the DOC mixing module and the SCR module based on the module connection pipe to avoid interference with the DOC mixing module or the SCR module. Exhaust gas purification apparatus, characterized in that provided inclined in the rotated position. The method according to any one of claims 1 to 4 and 7,
The mixing pipe is provided in a curved shape in the inner space of the DOC mixing module to increase the mixing distance between the purification gas and the reducing agent and to reduce the overall size of the DOC mixing module. . The method of claim 8,
An inlet chamber for introducing and storing the exhaust gas of the engine is formed at the other end of the DOC mixing module, and an exhaust chamber for storing and discharging the purified gas purified by the SCR module is formed at the other end of the SCR module. And
The DOC mixing module,
A mixing module case in which the first mixing chamber and the inflow chamber are formed at both ends;
A DOC unit disposed inside one side of the mixing module case and purifying the exhaust gas with the diesel oxidation catalyst; And
A mixing unit disposed inside the other side of the mixing module case and including the mixing pipe for mixing the purifying gas with the reducing agent to produce the mixed gas;
Exhaust gas purification apparatus comprising a. The method of claim 9,
The mixing unit,
The mixing pipe disposed in a space of the mixing module case formed between the DOC unit and the first mixing chamber, and connected to the first mixing chamber to have an outlet in communication;
A gas inlet connected to the inlet of the mixing pipe and the outlet of the DOC unit to guide the purified gas discharged from the outlet of the DOC unit to the inlet of the mixing pipe;
A reducing agent supply unit provided in the mixing pipe to inject the reducing agent into the mixing pipe; And
A gas mixer mounted inside the mixing pipe so as to be located behind the reducing agent supply device based on the flow direction of the purifying gas, and mixing the purifying gas and the reducing agent to produce the mixed gas;
Exhaust gas purification apparatus comprising a. The method of claim 10,
The inlet portion of the mixing pipe is disposed at a position eccentric in one direction from the central axis of the mixing module case,
The outlet of the mixing pipe is disposed at a position eccentric from the central axis of the mixing module case in the other direction,
An exhaust gas purification apparatus, wherein an intermediate portion of the mixing pipe is bent obliquely from an inlet portion of the mixing pipe toward an outlet portion of the mixing pipe. The method of claim 11,
The reducing agent supplier,
A spray nozzle for injecting the reducing agent into the purification gas flowing along the inside of the mixing pipe;
A nozzle supporter formed to penetrate the middle portion of the mixing pipe and the mixing module case to install the spray nozzle; And
Includes; a supporter frame provided in the mixing module case to stably support the nozzle supporter,
The injection nozzle is disposed in a direction in which the reducing agent is injected into the gas mixer, and the injection direction of the injection nozzle is inclined at a set angle in a direction opposite to the flow direction of the purification gas to compensate for a change due to the flow of the purification gas. Exhaust gas purification device, characterized in that set. The method of claim 12,
A through hole is formed in a portion of the mixing module case corresponding to the spray nozzle and the nozzle supporter,
The supporter frame may include a mounting cover part provided in a shape capable of covering the through hole and mounted on the mixing module case; And a supporter support part provided on the mounting cover to surround and support the nozzle supporter. The method of claim 13,
The exhaust gas purification apparatus, wherein the mounting cover part is detachably provided in the through hole part to enable replacement and maintenance of the spray nozzle and the nozzle supporter through the through hole part. The method of claim 10,
The gas mixer,
A mixer housing disposed inside an intermediate portion of the mixing pipe and formed in a cylindrical shape having a diameter smaller than that of the mixing pipe so that a gap is formed between the inner surface of the mixing pipe;
A lattice blade disposed in a lattice shape inside the mixer housing and formed in parallel along the length direction of the mixing pipe; And
And a mixer blade disposed at a rear portion of the lattice blade based on the flow direction of the mixed gas, and a plurality of mixer blades protruding alternately from the rear portion of the lattice blade in a direction crossing the longitudinal direction of the mixing pipe; and
The mixer blades, the exhaust gas purifying apparatus, characterized in that the less formed from the central portion of the lattice blade to the edge of the lattice blade, or formed only in the central portion of the lattice blade.

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