KR102488787B1 - After-treatment apparatus for exhaust gas and after-treatment method for exhaust gas using the same - Google Patents

Abstract

The present invention relates to a waste gas treatment device and a waste gas treatment method using the same. In one embodiment, the waste gas treatment device includes a pair of diesel particulate filter (DPF) units equipped with a heating means and burning and removing particulate matter from exhaust gas; It is connected to the pair of diesel particle filter units through a second line, has a reducing agent input unit into which a reducing agent is introduced, and contacts exhaust gas and a reducing agent under a selective catalytic reduction (SCR), so that among the exhaust gas and an SCR unit for removing harmful components such as nitrogen oxides, wherein the pair of diesel particle filter units includes a first diesel particle filter unit and a second diesel particle filter unit, wherein the first diesel particle filter unit and The second diesel particle filter units are connected in parallel through a first line.

Description

Exhaust gas post-treatment device and exhaust gas post-treatment method using the same

The present invention relates to an exhaust gas post-treatment device and an exhaust gas post-treatment method using the same.

Island internal combustion power plant diesel generators currently play an important role in supplying electricity to island regions. Diesel gas discharged from diesel generators mainly consists of nitrogen oxides (NO _X ) and soot. Due to the characteristics of island regions, diesel generators are installed with the minimum power generation unit configuration, and most of the environment-related facilities are installed. Currently it is not happening.

Meanwhile, international environmental regulations are being strengthened, and regulations on nitrogen oxides for diesel power generation and diesel engines in ships are expected to be strengthened in the US and Europe after 2016, and accordingly, regulations on island internal combustion diesel power generation in Korea are expected.

The technical method for reducing nitrogen oxides is to install a denitrification facility, but in the case of diesel power generation exhaust gas, since the conditions for installing the abatement facility are different, such as the characteristics of the exhaust gas from existing coal-fired power plants, a dedicated denitration catalyst suitable for diesel power plants It is necessary to develop technology to install and apply denitrification facilities to the site.

Unlike coal-fired power generation, in diesel power generation, catalyst deactivation is accelerated by the generation of soot and soot, which dramatically reduces the lifespan of the catalyst. should be considered In particular, in the case of diesel generators in island regions and diesel engines in ships, compact facilities for removing soot are required due to the narrow space in idle sites and facilities.

On the other hand, in the case of mobile pollutants such as diesel vehicles, which is a system similar to diesel power generation, a method is used to reduce nitrogen oxide generation at high temperatures by recirculating the exhaust gas to the intake air through EGR (Exhaust Gas Recirculation) to cause combustion at a low temperature. However, when applied to diesel power generation, the output is reduced, so it is not applicable.

Prior art related to the present invention is disclosed in Republic of Korea Patent Publication No. 2016-0032504 (published on March 24, 2016, title of the invention: Exhaust gas treatment device of marine diesel engine).

An object of the present invention is to provide an exhaust gas post-treatment device with excellent energy efficiency and economy during process operation.

Another object of the present invention is to provide an exhaust gas post-treatment device with excellent treatment efficiency of pollutants contained in diesel gas.

Another object of the present invention is to provide an exhaust gas post-treatment device capable of reducing a regeneration cycle and a regeneration time of a catalyst included in the post-treatment device.

Another object of the present invention is to provide an exhaust gas post-treatment device capable of reducing the size of a treatment facility.

Another object of the present invention is to provide an exhaust gas post-treatment method using the exhaust gas post-treatment device.

One aspect of the present invention relates to an exhaust gas aftertreatment device. In one embodiment, the exhaust gas post-treatment device includes a pair of diesel particulate filter (DPF) units equipped with a heating means and burning and removing particulate matter from exhaust gas; It is connected to the pair of diesel particle filter units through a second line, has a reducing agent input unit into which a reducing agent is introduced, and contacts exhaust gas and a reducing agent under a selective catalytic reduction (SCR), so that among the exhaust gas and an SCR unit for removing harmful components such as nitrogen oxides, wherein the pair of diesel particle filter units includes a first diesel particle filter unit and a second diesel particle filter unit, wherein the first diesel particle filter unit and The second diesel particle filter units are connected in parallel through a first line.

In one embodiment, the first diesel particle filter unit and the second diesel particle filter unit and the SCR unit may have a step difference.

In one embodiment, a baffle plate for reducing the flow rate of exhaust gas is provided in the second line, and the baffle plate may have a blade-type cross section.

In one embodiment, the exhaust gas is respectively introduced into the first diesel particle filter unit and the second diesel particle filter unit through the first line to burn and remove particulate matter in the exhaust gas, and the exhaust gas from which the particulate matter is removed is It is introduced into the SCR unit through the second line to contact exhaust gas and a reducing agent under a selective reduction catalyst to remove nitrogen oxides from the exhaust gas, and the exhaust gas from which the particulate matter is removed is introduced into the SCR unit, It may pass through the baffle plate provided in the second line.

In one embodiment, the exhaust gas is introduced into the SCR unit, and nitrogen oxides are removed by contacting the exhaust gas and the reducing agent under a selective reduction catalyst, and the exhaust gas from which the nitrogen oxides are removed is passed through a second line to the first diesel particle filter unit and Each is introduced into the second diesel particle filter unit to burn and remove particulate matter from the exhaust gas, and the exhaust gas from which the nitrogen oxides are removed is introduced into the first diesel particle filter unit and the second diesel particle filter unit, It can pass through the baffle plate provided in the second line.

In one embodiment, the selective reduction catalyst is one in which an active ingredient and a cocatalyst are supported on a carrier containing at least one of titanium dioxide, molybdenum oxide, and silicon dioxide, and the active ingredient is vanadate or a rare earth-vanadate compound. Including, the cocatalyst may include at least one of molybdenum oxide and tungsten oxide.

Another aspect of the present invention relates to an exhaust gas post-treatment method using the exhaust gas post-treatment device. In one embodiment, the exhaust gas post-treatment method includes introducing exhaust gas into a first diesel particle filter unit and a second diesel particle filter unit connected in parallel through a first line, respectively, to burn and remove particulate matter in the exhaust gas. step; and introducing the exhaust gas from which the particulate matter has been removed into an SCR unit through a second line to contact the exhaust gas and a reducing agent under a selective reduction catalyst to remove nitrogen oxides from the exhaust gas. The removed exhaust gas passes through a baffle plate provided in the second line before being introduced into the SCR unit.

In another embodiment, the exhaust gas post-treatment method includes introducing exhaust gas into an SCR unit to contact the exhaust gas and a reducing agent under a selective reduction catalyst to remove nitrogen oxides; and introducing the exhaust gas from which the nitrogen oxides have been removed into a first diesel particle filter unit and a second diesel particle filter unit through a second line, respectively, to burn and remove particulate matter in the exhaust gas. Exhaust gas from which oxides are removed passes through baffle plates provided in the second line before being introduced into the first diesel particle filter unit and the second diesel particle filter unit.

In one embodiment, the first diesel particle filter unit and the second diesel particle filter unit and the SCR unit may have a step difference.

In one embodiment, the baffle plate may have a blade-type cross section.

In one embodiment, the selective reduction catalyst is one in which an active ingredient and a cocatalyst are supported on a carrier containing at least one of titanium dioxide, molybdenum oxide, and silicon dioxide, and the active ingredient is vanadate or a rare earth-vanadate compound. Including, the cocatalyst may include at least one of molybdenum oxide and tungsten oxide.

When the exhaust gas post-treatment device of the present invention is applied to treat exhaust gas from a diesel generator, the removal efficiency of pollutants such as nitrogen oxides and soot contained in diesel gas is excellent, and the volume of the exhaust gas post-treatment device is minimized, Among the post-processing devices, the regeneration cycle and regeneration time of the DPF removal unit are shortened so that the treatment efficiency is excellent, the treatment facility can be reduced in size, and energy efficiency and economy are excellent.

1 shows an exhaust gas post-treatment device according to one embodiment of the present invention.
2 shows an exhaust gas post-treatment device according to another embodiment of the present invention.
Figure 3 (a) shows a cross-section of a baffle plate according to one embodiment of the present invention, Figure 3 (b) shows a baffle plate according to one embodiment of the present invention.

In describing the present invention, if it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator, so the definitions should be made based on the content throughout this specification describing the present invention.

Exhaust gas after-treatment device

One aspect of the present invention relates to an exhaust gas aftertreatment device. 1 shows an exhaust gas post-treatment device according to one embodiment of the present invention. Referring to FIG. 1, the exhaust gas post-processing device 100 is provided with a heating means (not shown) and is a pair of diesel particulate filter (DPF) units that burn and remove particulate matter from the exhaust gas. (20, 22); It is connected through a pair of diesel particle filter units (20, 22) and the second line (30), and is provided with a reducing agent input unit (42, 44) into which a reducing agent is introduced, and a selective catalytic reduction (SCR) and an SCR unit 40 that removes harmful components such as nitrogen oxides from the exhaust gas by contacting the exhaust gas and the reducing agent under the unit 20 and the second diesel particle filter unit 22, the first diesel particle filter unit 20 and the second diesel particle filter unit 22 are connected in parallel through the first line 10.

Referring to FIG. 1, in order to input reducing agent according to variable operation, a first reducing agent input unit 42 and a second reducing agent input unit 44 may be provided at the front and rear ends of the SCR unit 40, respectively. there is.

In one embodiment, an ammonia slip catalyst (ASC) may be further provided at the rear end of the SCR unit 40. The ammonia slip catalyst can prevent a phenomenon in which unreacted ammonia (NH ₃ ) among the introduced reducing agents reacts with other components inside the SCR removal unit to generate environmentally harmful substances.

In one embodiment of the present invention, the SCR unit 40 includes a thermometer for measuring the internal temperature of the SCR unit 40; a pressure measuring instrument for measuring the differential pressure between the front and rear ends of the SCR unit 40; A bypass valve may be further provided to relieve back pressure inside the SCR unit 40 when a flow path is changed due to a switching operation.

In one embodiment of the present invention, the first diesel particle filter unit 20 and the second diesel particle filter unit 22 include a thermometer for measuring the internal temperature of the diesel particle filter unit; a pressure measuring instrument for measuring a differential pressure between a front end and a rear end of the diesel particle filter unit; When a flow path is changed due to a switching operation, a bypass valve for relieving back pressure inside the diesel particle filter unit may be further provided.

As shown in FIG. 1, the first diesel particle filter unit 20 and the second diesel particle filter unit 22 and the SCR unit 40 may have a step difference. When the step difference is formed, soot included in the exhaust gas is precipitated at the bottom by the step difference formation, and the exhaust gas treatment efficiency may be excellent. The precipitated soot may be removed by draining through a strainer (not shown) provided under the SCR unit. When the step is formed as described above, an effect of reducing a forced regeneration cycle according to an increase in back pressure may be obtained.

Referring to FIGS. 1 and 2 , a baffle plate 32 for reducing the flow rate of exhaust gas may be provided in the second line 30 . Figure 3 (a) shows a cross-section of a baffle plate according to one embodiment of the present invention, Figure 3 (b) shows a baffle plate according to one embodiment of the present invention. Referring to FIG. 3 , the baffle plate 32 may have a blade-shaped cross section. When the baffle plate of the above type is provided, it is possible to easily control the residence time inside the second line by inhibiting the linear exhaust gas flow and forming turbulent flow. In one embodiment, it is possible to easily adjust the residence time of the exhaust gas introduced into the second line 30 by controlling the angle adjuster 34 formed on one surface of the baffle plate.

In one embodiment, the first diesel particle filter unit 20 and the second diesel particle filter unit 22 may burn and remove particulate matter in the exhaust gas at a temperature of 450 to 600°C. Under the above temperature conditions, particulate matter removal efficiency may be excellent.

In one embodiment, the SCR unit 40 may contact exhaust gas and a reducing agent under a selective reduction catalyst at a temperature of 350 to 450° C. to remove harmful components such as nitrogen oxides from the exhaust gas. Nitrogen oxide removal efficiency may be excellent in the above temperature range.

Referring to FIG. 1, the exhaust gas is introduced into the SCR unit 40 through the third line 50, and nitrogen oxide is removed by contacting the exhaust gas and the reducing agent under a selective reduction catalyst, and the nitrogen oxide is removed. Exhaust gas flows into the first diesel particle filter unit 20 and the second diesel particle filter unit 22 through the second line 30, respectively, and particulate matter in the exhaust gas can be burned and removed. In one embodiment, the exhaust gas from which the particulate matter is removed may be introduced into the first line 10 and discharged.

In one embodiment, the exhaust gas from which nitrogen oxides are removed is introduced into the first diesel particle filter unit 20 and the second diesel particle filter unit 22, before being introduced into the baffle plate 32 provided in the second line 30. ) can pass through. When the exhaust gas passes through the baffle plate 32, a vortex is formed, and the exhaust gas at a uniform flow rate flows into the first and second diesel particle filter units 20 and 22, so that treatment efficiency can be excellent. .

2 shows an exhaust gas post-treatment device 200 according to another embodiment of the present invention. Referring to FIG. 2, exhaust gas flows into the first diesel particle filter unit 20 and the second diesel particle filter unit 22 through the first inlet 12 formed in the first line 10, respectively, and is exhausted. Particulate matter in the gas is removed by combustion, and the exhaust gas from which the particulate matter is removed flows into the SCR unit 40 through the second line 30 and contacts the exhaust gas and the reducing agent under a selective reduction catalyst to remove the exhaust gas. heavy nitrogen oxides can be removed.

In one embodiment, the exhaust gas from which the particulate matter is removed may pass through the baffle plate 32 provided in the second line 30 before being introduced into the SCR unit 40 .

In one embodiment, the exhaust gas from which nitrogen oxides are removed from the SCR unit 40 may be discharged to the outside through the third line 50 .

selective reduction catalyst

The selective reduction catalyst may be used in which an active component and a cocatalyst are supported on a support containing at least one of titanium dioxide (TiO ₂ ), molybdenum oxide (MoO ₃ ) and silicon dioxide (SiO ₂ ).

In one embodiment, when the above type of support is applied, the viscosity of the support is lowered to easily support the catalyst, so that the catalyst loading is increased for application to areas where the exhaust gas flow rate is high, such as at the rear end of a diesel generator. advantageous if In addition, the specific surface area of the support may be increased to improve reactivity. In particular, since silicon dioxide may form a strong bonding structure with rare earth metal oxides among active materials, activity may be excellent even at a high temperature of 500° C. or higher.

In one embodiment, the support may include 0.1 to 10 parts by weight of molybdenum oxide and 0.1 to 25 parts by weight of silicon dioxide based on 100 parts by weight of titanium dioxide. When included in the above weight range, the active material can be easily supported, and the specific surface area can be increased, resulting in excellent reactivity. For example, 1 to 4 parts by weight of molybdenum oxide and 3 to 12 parts by weight of silicon dioxide may be included based on 100 parts by weight of the titanium dioxide.

In one embodiment, the active ingredient may include vanadate or a rare earth-vanadate compound. When the active ingredient is applied, reduction efficiency of nitrogen oxides in exhaust gas may be excellent.

In one embodiment, when the operating temperature of the SCR unit is 300 to 450 ° C, vanadate may be included. In another embodiment, when the operating temperature of the SCR unit is 500° C. or higher, a rare earth-vanadate compound may be included. In another embodiment, when the operation is performed in the order of the DPF removal unit and the SCR removal unit, a rare earth-vanadate compound may be included.

In one embodiment, the rare earth may include at least one of scandium (Sc), yttrium (Y), and lanthanide groups ranging from lanthanum (La) to lutetium (Lu). In one embodiment, neodymium-vanadate (NdVO ₄ ) and cerium-vanadate (CeVO ₄ ) may be used as the rare earth-vanadate compound. In one embodiment, the rare earth-vanadate compound may have a vanadate/rare earth ratio of 3 to 4. Within the above range, reduction efficiency of nitrogen oxides in exhaust gas may be excellent.

In one embodiment, the active ingredient may be included in an amount of 1 to 15 parts by weight based on 100 parts by weight of the support. When included in the above weight range, selective catalytic reduction efficiency may be excellent.

The cocatalyst may be included for the purpose of improving the selective catalytic reduction efficiency of the active material. In one embodiment, the cocatalyst may include at least one of molybdenum oxide (MoO ₃ ), iron oxide, and tungsten oxide (WO ₃ ).

In one embodiment, the cocatalyst may be included in an amount of 1 to 8 parts by weight based on 100 parts by weight of the support. When included in the above weight range, selective catalytic reduction efficiency may be excellent.

Exhaust gas post-treatment method using an exhaust gas post-treatment device

Another aspect of the present invention relates to an exhaust gas post-treatment method using the exhaust gas post-treatment device. In one embodiment, the exhaust gas post-treatment method includes introducing exhaust gas into a first diesel particle filter unit and a second diesel particle filter unit connected in parallel through a first line, respectively, to burn and remove particulate matter in the exhaust gas. step; and introducing the exhaust gas from which the particulate matter has been removed into an SCR unit through a second line to contact the exhaust gas and a reducing agent under a selective reduction catalyst to remove nitrogen oxides from the exhaust gas. The removed exhaust gas passes through a baffle plate provided in the second line before being introduced into the SCR unit.

In another embodiment, the exhaust gas post-treatment method includes introducing exhaust gas into an SCR unit to contact the exhaust gas and a reducing agent under a selective reduction catalyst to remove nitrogen oxides; and introducing the exhaust gas from which the nitrogen oxides have been removed into a first diesel particle filter unit and a second diesel particle filter unit through a second line, respectively, to burn and remove particulate matter in the exhaust gas. Exhaust gas from which oxides are removed passes through baffle plates provided in the second line before being introduced into the first diesel particle filter unit and the second diesel particle filter unit.

In one embodiment, the first diesel particle filter unit and the second diesel particle filter unit and the SCR unit may have a step difference.

In one embodiment, the baffle plate may have a blade-type cross section.

In one embodiment, the selective reduction catalyst is one in which an active ingredient and a cocatalyst are supported on a carrier containing at least one of titanium dioxide, molybdenum oxide, and silicon dioxide, and the active ingredient is vanadate or a rare earth-vanadate compound. Including, the cocatalyst may include at least one of molybdenum oxide and tungsten oxide. The selective reduction catalyst may be used with the same components and contents as described above.

In one embodiment, the operation of a heating means such as a heater or burner for inputting a reducing agent into the SCR removal unit and regenerating the DPF removal unit of the present invention can be controlled through a control logic reflecting constraint conditions. there is.

Among the reducing agents, urea may precipitate when the DPF removal unit is operated in winter or in a cold region due to its low freezing point. In this case, the urea precipitate flows in a normal flow, but the flow rate is reduced by interfering with the flow at the trim part in the control valve of the SCR removal unit. Afterwards, despite the increase in the value of the control valve opening, the flow rate decreases and then escapes, affecting the measured value for mass control, so it is not a real flow, but a large flow rate measurement value instantaneously due to foreign substances with different densities As a result, noise is generated in which the behavior of the control valve for control is greatly shaken.

In general, in the case of a foreign substance smaller than the size enough to block the trim part, a small amount of noise is generated, so a large noise is to be solved. In general control, if the noise band is less than 2%, it does not greatly affect the operation of the proportional integral control (PI Controller). However, in the case of this process, the setting value (SV) has a small value, so the PI controller value is affected by noise. In addition, due to the characteristics of the flow rate, a control with a very fast response is required, and the scan time also has a value within about 0.25 to 0.5 seconds, so robust control is important.

In one embodiment, the reducing agent (urea) input (urea dosing) injected into the SCR removal unit through the reducing agent input unit adjusts the equivalent amount (0.7 to 0.9) according to the nitrogen oxide (NOx) measurement value, and feedback control using PID control ( Feedback Control) can be used to control.

In one embodiment, a filter block may be inserted into the SCR unit to control the amount of reducing agent injected through the reducing agent input unit.

In one embodiment, the abnormality criterion of the filter may be determined by the control valve opening value criterion of Equation 1 below and the flow rate value change criterion of Equation 2:

[Equation 1]

[Equation 2]

(In Equation 2 above, PV is a set value).

In one embodiment, heating means such as a heater or burner for regeneration of the DPF removal unit may be turned on/off when a predetermined value is reached. In one embodiment, it may be set using empirical reproduction cycle data. It can be set from the differential pressure value measured in another embodiment. In another embodiment, the above two cases may be combined and controlled by weighted conditions.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and cannot be construed as limiting the present invention by this in any sense.

manufacturing example 1 to 5

A support containing titanium dioxide, molybdenum oxide and silicon dioxide in the contents shown in Table 1 below was prepared. With respect to the supports prepared in Preparation Examples 1 to 5, the surface area (BET method) was measured at a temperature of 400 ° C., and the results are shown in Table 1 together.

division
(unit: parts by weight) titanium dioxide
(TiO ₂ ) molybdenum oxide
(MoO ₃ ) silicon dioxide
(SiO ₂ ) Support surface area (m ² /g)@400℃ Preparation Example 1 100 1.7 10 84 Preparation Example 2 100 - - 61 Preparation Example 3 100 1.7 - 85 Production Example 4 100 3.4 - 87 Preparation Example 5 100 - 10 70

Referring to the results of Table 1, the surface area of the supports of Preparation Examples 1 and 3 to 5 containing at least one of titanium dioxide, molybdenum oxide and silicon dioxide according to the present invention is increased compared to the support of Preparation Example 2. Could know.

Example and comparative example

Example

An exhaust gas post-processing device 100 as shown in FIG. 1 was applied to treat exhaust gas generated during diesel power generation.

The first diesel particle filter unit 20 and the second diesel particle filter unit 22 are configured in parallel through the first line 10, and the first diesel particle filter unit 20 and the second diesel particle filter unit ( 22) and the SCR unit 40 are formed to have a step difference, and the selective reduction catalyst includes an active component (NdVO ₄ ) in 100 parts by weight of a support including 100 parts by weight of titanium dioxide, 1.7 parts by weight of molybdenum oxide, and 10 parts by weight of silicon dioxide. 5 parts by weight and 4 parts by weight of a cocatalyst (WO ₃ ) were used.

Soot: 9.07g/Nm ³ , Nitrogen oxide (NO _X ) concentration: Exhaust gas containing 1,070 ppm is introduced into the SCR unit 40 through the third line 50, and selectively at an internal temperature of 350 ° C. Under the reduction catalyst, the exhaust gas and the reducing agent are contacted to remove nitrogen oxides from the exhaust gas, and discharged through the second line (30). Then, it diverges from the second line, flows into the first diesel particle filter unit 20 and the second diesel particle filter unit 22 having the same volume, respectively, and heats the first diesel particle filter unit 20 ) and the second diesel particle filter unit 22 were heated to 450 to 600° C. to burn and remove particulate matter in the exhaust gas. Then, the exhaust gas from which the particulate matter was removed was discharged through the first line. The exhaust gas from which the particulate matter is removed passes through the baffle plate 32 provided in the second line 30 before being introduced into the first diesel particle filter unit 20 and the second diesel particle filter unit 22, By forming a vortex, it diverged and flowed in at the same flow rate.

comparative example

EXAMPLE Exhaust gas is treated in the same manner as in Example, except that an exhaust gas post-processing device in which a diesel particle filter unit having twice the volume of the diesel particle filter unit and an SCR unit are connected in series without a step is applied. did

When applying the exhaust gas post-treatment method according to the above examples and comparative examples, the DPF removal unit's regeneration cycle (cycle for removing particulate matter by burning), regeneration time (time for burning and removing particulate matter), nitrogen oxide removal rate and soot The removal rate was measured and the results are shown in Table 2 below.

division Example comparative example modeling result Test result Regeneration cycle (hr) 21.2 20.5 29 Playing time (min) 8.4 19.5 23 Nitrogen oxide removal rate (%) 80.5 80.5 92 Soot removal rate (%) 99.9 99.9 100

Referring to Table 2, when processing exhaust gas using the exhaust gas post-treatment device according to the embodiment of the present invention, compared to the comparative example in which the SCR unit and the diesel particle filter unit are arranged in series, the SVR of the diesel particle filter unit While maintaining the swept volume ratio, having a more compact volume than the conventional system, and maintaining the overall system back pressure, the volume is reduced by 1/2 compared to the diesel particle filter unit of the comparative example, and the diesel particle filter unit It was found that the time required to raise and maintain the volume at 600° C. or higher was reduced, thereby shortening the regeneration time of the diesel particle filter unit.

Simple modifications or changes of the present invention can be easily performed by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

10: first line 12: first inlet
20: first diesel particle filter unit 22: second diesel particle filter unit
30: second line 32: baffle plate
34: angle adjusting unit 40: SCR unit
42: first reducing agent input unit 44: second reducing agent input unit
50: third line
100: Exhaust gas post-processing device
200: Exhaust gas post-processing device

Claims (11)

A pair of diesel particulate filter (DPF) units equipped with a heating means and burning and removing particulate matter from exhaust gas;
It is connected to the pair of diesel particle filter units through a second line, has a reducing agent input unit into which a reducing agent is introduced, and contacts exhaust gas and a reducing agent under a selective catalytic reduction (SCR), so that among the exhaust gas Includes; SCR unit to remove nitrogen oxides and soot,
The pair of diesel particle filter units includes a first diesel particle filter unit and a second diesel particle filter unit, and the first diesel particle filter unit and the second diesel particle filter unit are connected in parallel through a first line. ,
The first diesel particle filter unit and the second diesel particle filter unit and the SCR unit have a step difference,
By the formation of the step, the soot in the exhaust gas is precipitated and removed from the lower part of the SCR unit,
The second line is provided with a baffle plate for reducing the flow rate of exhaust gas,
The exhaust gas aftertreatment device, characterized in that the baffle plate has a blade-type cross section.
delete delete The method of claim 1, wherein the exhaust gas flows into the first diesel particle filter unit and the second diesel particle filter unit through the first line, respectively, and burns and removes particulate matter in the exhaust gas,
The exhaust gas from which the particulate matter is removed is introduced into the SCR unit through the second line, and nitrogen oxides in the exhaust gas are removed by contacting the exhaust gas and a reducing agent under a selective reduction catalyst,
Exhaust gas from which the particulate matter is removed passes through a baffle plate provided in the second line before being introduced into the SCR unit.
The method of claim 1, wherein the exhaust gas flows into the SCR unit and nitrogen oxide is removed by contacting the exhaust gas and the reducing agent under a selective reduction catalyst,
The exhaust gas from which the nitrogen oxides have been removed flows into the first diesel particle filter unit and the second diesel particle filter unit through a second line, respectively, and burns and removes particulate matter in the exhaust gas,
The exhaust gas post-processing device of claim 1 , wherein the exhaust gas from which nitrogen oxides are removed passes through a baffle plate provided in the second line before flowing into the first diesel particle filter unit and the second diesel particle filter unit.
The method of claim 1, wherein the selective reduction catalyst is one in which an active ingredient and a cocatalyst are supported on a carrier containing at least one of titanium dioxide, molybdenum oxide and silicon dioxide,
The active ingredient includes vanadate or a rare earth-vanadate compound,
The exhaust gas aftertreatment device, characterized in that the cocatalyst contains at least one of molybdenum oxide and tungsten oxide.
introducing exhaust gas into a first diesel particle filter unit and a second diesel particle filter unit connected in parallel through a first line, respectively, to burn and remove particulate matter in the exhaust gas; and
Introducing exhaust gas from which the particulate matter has been removed into an SCR unit through a second line, and removing nitrogen oxides from the exhaust gas by contacting the exhaust gas and a reducing agent under a selective reduction catalyst,
The exhaust gas from which the particulate matter is removed passes through a baffle plate provided in the second line before flowing into the SCR unit,
The first diesel particle filter unit and the second diesel particle filter unit and the SCR unit have a step difference,
Due to the formation of the step, soot in the exhaust gas is precipitated and removed at the bottom of the SCR unit,
The exhaust gas post-treatment method according to claim 1, wherein the baffle plate has a blade-shaped cross section.
removing nitrogen oxides by introducing the exhaust gas into the SCR unit and contacting the exhaust gas and the reducing agent under a selective reduction catalyst; and
Injecting the exhaust gas from which the nitrogen oxides have been removed into a first diesel particle filter unit and a second diesel particle filter unit through a second line, respectively, to burn and remove particulate matter in the exhaust gas;
The exhaust gas from which the nitrogen oxides are removed passes through the baffle plate provided in the second line before being introduced into the first diesel particle filter unit and the second diesel particle filter unit,
The first diesel particle filter unit and the second diesel particle filter unit and the SCR unit have a step difference,
Due to the formation of the step, soot in the exhaust gas is precipitated and removed at the bottom of the SCR unit,
The exhaust gas post-treatment method according to claim 1, wherein the baffle plate has a blade-shaped cross section.
delete delete The method of any one of claims 7 and 8, wherein the selective reduction catalyst is one in which an active ingredient and a cocatalyst are supported on a carrier containing at least one of titanium dioxide, molybdenum oxide and silicon dioxide,
The active ingredient includes vanadate or a rare earth-vanadate compound,
The exhaust gas post-treatment method, characterized in that the cocatalyst contains at least one of molybdenum oxide and tungsten oxide.

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