WO2011034270A1

WO2011034270A1 - Scr system for a ship or an overland plant

Info

Publication number: WO2011034270A1
Application number: PCT/KR2010/002446
Authority: WO
Inventors: 황계윤; 황성철
Original assignee: 광성(주)
Priority date: 2009-09-18
Filing date: 2010-04-20
Publication date: 2011-03-24

Abstract

Disclosed is an SCR system for a ship or an overland plant, which purifies the exhaust gas emitted from exhaust gas equipment of a ship or of an overland plant and releases the purified gas. The SCR system comprises: an NOx-removing SCR reactor containing a catalyst to be activated by the exhaust gas emitted from the exhaust gas equipment; a reducing agent supply line for supplying NH3 or urea to the SCR reactor or to the reducing agent supply point existing upstream from the SCR reactor; sensors for sensing components in the exhaust gas which has passed through at least the SCR reactor; and an ECU for controlling the amount of reducing agent being supplied through the reducing agent supply line using information obtained from the sensors.

Description

SC system for ship or land plant

The present invention relates to an SCR system for reducing nitrogen oxides (NOx) in exhaust gas, and more particularly, to an SCR system for purifying exhaust gas generated from a ship. The present invention is applicable to all ships and has been developed to satisfy various regulations.

The SCR system is used to reduce NOx in exhaust gas generated during ship operation. For example, SCR systems are also required to reduce nitrogen oxides in boilers mounted on ship engines or LNG carriers. The SCR system is a NOx reduction system using a selective catalytic reduction method. The SCR system is configured to react NOx with a reducing agent and reduce the nitrogen and water vapor while simultaneously passing the exhaust gas and the reducing agent in the catalyst. There have been many efforts to improve the ship's SCR system in recent years, and despite such efforts, the ship's uniqueness, such as its movement and vibration at sea, and hence the high load parameters, is noticeable. No results are available.

SCR systems use NH3 and urea as reducing agents for NOx reduction. The conventional SCR system includes a dust collector which occupies a complex and large volume at the rear end of the SCR reactor casing to reduce particulate matter (PM), dust, and fine dust contained in the exhaust gas which has been reacted in the SCR reactor. Therefore, the conventional SCR system increases the overall size of the SCR system due to the dust collector. Therefore, applying the conventional SCR system including a general dust collector to a relatively narrow vessel is very disadvantageous in that it further reduces the idle space of the vessel. In addition, the SCR system should be designed in consideration of the conditions of the ship, the dust collector can be a cause that makes the overall design of the SCR system considering the conditions of the ship difficult. In addition, the installation cost of the SCR system will be greatly increased due to the dust collector, and the cost incurred by the operation of the dust collector is also large.

In addition, the problem of the SCR system of the conventional vessel is that high pressure air is required to supply urea or NH3, which is a reducing agent, into the SCR reactor, and to connect such high pressure air to a line to which the reducing agent is supplied or to use a compressor. There is a problem that complicated piping or equipment is required. In addition, the prior art also has a limitation in supplying urea or NH3 to the SCR reactor with high purity.

In particular, there is a problem that the conventional SCR system of the ship is vulnerable to vibration by itself or external force. The inventors of the present invention have found that vibrations can cause destruction and damage to the system and therefore require a countermeasure. In particular, since the ship is subjected to high external shocks or vibrations due to high waves, the SCR system installed therein is also more vulnerable to external shocks or vibrations.

In addition, in the conventional SCR system for a ship or a land plant, an operator directly measures a pollutant at a predetermined position of the SCR system using a portable pollutant analyzer, and manages the SCR system based on the measured result. Thus, the prior art has many limitations in controlling and managing the SCR system as a whole.

One problem to be solved by the present invention is that it is optimized for the treatment of off-gas from off-gas installations of ships or onshore plants, and it is more efficient to remove NOx and PM (particle material), dust and / or fine dust in the off-gas. It is to provide an SCR system for a ship or a land plant that can be reduced.

According to one aspect of the present invention, there is provided an SCR system for a ship or land plant for purifying and exhausting the exhaust gas from the off-gas installation in a ship or land plant. The SCR system includes a NOx removal SCR reactor including a catalyst activated by exhaust gas from the exhaust gas facility, a reducing agent supply line for supplying NH3 or urea to the reducing agent supply position upstream of the SCR reactor or upstream thereof; Sensors for measuring at least components in the exhaust gas that have passed through the SCR reactor, and an ECU for controlling the amount of reducing agent supply through the reducing agent supply line using information obtained from the sensors.

Preferably, the SCR system is configured to check for abnormalities of the sensors by the ECU.

Preferably, the SCR system further comprises an air soot blower that blows air supplied from the air line to the catalyst to remove foreign matter trapped in the catalyst, more preferably, the amount of air poured into the catalyst Controlled by the ECU.

Preferably, the ECU controls the supply amount of the reducing agent based on the NOx amount and NH3 amount information among the information obtained from the sensors.

Preferably, the SCR system further includes an analyzer for analyzing the information measured by the sensors to provide to the ECU.

Preferably, the SCR system further includes an OBM system for monitoring data acquired from the sensors while communicating with the ECU by wire or wirelessly.

More preferably, the SCR system further comprises an OBM system in communication with the ECU in wire or wirelessly, for monitoring and storing data obtained from the sensors.

Preferably, the OBM system is configured to be able to directly input the coefficient of the ship engine specifications, it is configured to display the monitor by switching the mode of the unit of the exhaust gas to the unit desired by the user.

According to one embodiment, the OBM system has a function of selecting the unit of the NOx, NH3, HC, SOx, SO2 or CO component in the exhaust gas to g / kWh or ppm to display on the monitor.

According to one embodiment, the OBM system has a function of selecting the unit of the PM component in the exhaust gas of mg / m3, g / kWh, or ppm to display on the monitor.

According to one embodiment, the OBM system has a function of displaying the unit of CO2 or O2 component in exhaust gas in% or ppm on the monitor.

Advantageously, the OBM system may cause all functions of the ECU to be switched to a mode by automatic control or manual control.

Preferably, a flexible first connection structure and a second connection structure are respectively disposed in the front pipe and the rear pipe of the SCR reactor, and the SCR reactor or its connection is disposed between the first connection structure and the second connection structure. A vibration isolator is installed to support the pipes on both sides of the connection.

Advantageously, the SCR system further comprises a bypass system for bypassing the exhaust gas from said exhaust gas facility from said SCR reactor in an abnormal state, wherein said bypass system is provided at both ends of said reactor. And bypass dampers connected to a rear end pipe and bypass dampers respectively provided at both ends of the bypass line to close the bypass line in a normal state and open the bypass line in an abnormal state. Controls the bypass dampers.

According to another aspect of the invention there is provided an SCR system for a ship or land plant for purifying and exhausting the exhaust gases from the off-gas installation in a ship or land plant. The SCR system includes a NOx removal SCR reactor including a catalyst activated by exhaust gas from the exhaust gas facility, a reducing agent supply line for supplying NH3 or urea to the reducing agent supply position upstream of the SCR reactor or upstream thereof; A heater for heating the exhaust gas to burn SOOT, dust or foreign matter in the exhaust gas, and a Diesel Particulate Filter (DPF) device for reducing PM, dust or fine dust in the exhaust gas at the rear end of the heater.

Preferably, the heater and the DPF device are located between the exhaust gas facility and the SCR reactor. More preferably, the heater and the DPF device are located upstream of the reducing agent supply position.

In addition, the heater and the DPF device may be located downstream of the SCR reactor.

According to the present invention, the ECU directly detects the pollutant at a certain position of the SCR system using a portable pollutant analyzer and manages the SCR system based on the measured result. And / or other information, the overall control of the SCR system can be achieved. In addition, according to the present invention, the OBM system can be provided for wired or wireless communication with the ECU, thereby operating the SCR system and Users can provide, monitor, and store various data necessary for management. SCR for ship or land plant, which is optimized for the treatment of off-gas from the off-gas plant of a ship or onshore plant, and can more efficiently reduce NOx and PM (Particle Material), dust and / or fine dust in the off-gas. The system is implemented. The SCR system according to the present embodiment effectively reduces NOx by the SCR reactor and its component (s) associated therewith, as well as PM in exhaust gas by a DPF system including a heater and a DPF device installed in place of the dust collector, Dust and fine dust can also be effectively removed. Since heaters are pre-burned by heaters of soot or foreign matter that are difficult to filter out by the DPF device, the DPF system can more efficiently remove contaminants in the exhaust gas. The DPF device can be regenerated and used by simply shaking off the filter.

1 is a view for explaining the SCR system of a ship according to a first embodiment of the present invention.

2 is a view for explaining the SCR system of a ship according to a second embodiment of the present invention.

3 is a view for explaining an SCR system of a ship according to a third embodiment of the present invention.

4 shows a modification of the third embodiment shown in FIG.

5 is a view for explaining the SCR system of the ship according to a fourth embodiment of the present invention.

6 is a view showing a modification of the fourth embodiment shown in FIG.

7 is a view showing an example in which the DPF system is disposed downstream of the SCR reactor according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention can be fully conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. In the drawings, widths, lengths, thicknesses, and the like of components may be exaggerated for convenience. Like numbers refer to like elements throughout. In addition, Table 1 below describes the names of elements or signals denoted by symbols in the accompanying drawings.

Table 1

<제1 실시예><First Embodiment>

1 is a view for explaining the SCR system of a ship according to a first embodiment of the present invention. As used in the description and in the claims, the term 'vessel' includes not only ships in the general sense with propulsion engines but also floating structures that can float on the sea.

Referring to FIG. 1, the SCR system of the present embodiment includes an SCR reactor 2 having a front end connected to an exhaust gas installation 1. The exhaust gas installation 1 may be an engine for propulsion of a ship, an engine for other uses, a boiler in an LNG carrier, or various kinds of facilities for exhausting exhaust gas by combustion in a ship. The SCR reactor 2 includes a catalyst for reducing NOx in exhaust gas by a selective catalytic reduction method. In the casing of the SCR reactor 2, NOx is reduced to nitrogen by reacting with a reducing agent in the presence of a catalyst.

The SCR system according to the present embodiment includes a catalyst which is activated and usable at 200 ° C. to 500 ° C. reaction temperature in the SCR reactor 2. The activation temperature range of the catalyst, i.e., 200 deg. C to 500 deg. C, is preferably determined based on the time point at which the exhaust gas passes through the SCR reactor 2. In addition, the system of the present embodiment selects and uses a catalyst having an activation temperature corresponding to the exhaust gas temperature passing through the SCR reactor 2 in consideration of the decrease in temperature as the exhaust gas proceeds out of the exhaust gas installation 1.

In addition, two or more kinds of catalysts having different activation temperatures may be embedded in the SCR reactor 2. This may contribute to widening the temperature range at which the catalytic reaction takes place in the SCR reactor 2. In addition, in the SCR reactor 2, a catalyst for reducing other components may be further installed in addition to the catalyst for reducing NOx.

Unlike the conventionally known system, the SCR system of the ship which concerns on a present Example is not equipped with the dust collection facility in the rear end of the SCR reactor 2. As shown in FIG. Instead, the system of this embodiment includes a DPF system in front of the SCR reactor 2. A front side of the SCR reactor 2, that is, between the SCR reactor 2 and the exhaust gas installation 1, is provided with a DPF system comprising a heater 21 and a DPF device 20. At this time, it is preferable to place the DPF system upstream of the SCR reactor 2. However, it may also be considered to eliminate the DPF system upstream of the SCR reactor 2 and to place the DPF system downstream of the SCR reactor 2. In the DPF system, the heater 21 may use, for example, gas, electricity, steam, or air.

In this embodiment, the DPF system, i.e., the heater 21 and the DPF apparatus 20, is arranged at a position where the reducing agent is supplied by the reducing agent supply line 4 described below, that is, upstream of the reducing agent supply position. Is preferred. Upstream of the reducing agent supply position, the heater 21 heats the exhaust gas from the exhaust gas installation 1 to the SCR reactor 2 to burn soot, dust or foreign matter in the exhaust gas. The DPF device 20 filters and reduces PM, dust, or fine dust in the exhaust gas at the rear end of the heater 21. At this time, since the DPF apparatus 20 filters out only the components of the fine particles remaining by the heater 21, the DPF apparatus 20 can purify the exhaust gas more efficiently and send it to the SCR reactor 2.

As briefly mentioned above, the system of the present embodiment includes various sensors capable of detecting NO x, NH 3, PM, HC, SO ₂ , CO, CO ₂ , O _2, etc. in the exhaust gas at the rear end of the SCR reactor ₂ . (11) can be provided. In addition, the system includes an analyzer for analyzing residual components in the exhaust gas such as NOx, NH ₃ , PM, HC, SO ₂ , CO, CO ₂ , O ₂ using information obtained from the sensor 11. ) Is provided at the rear end of the SCR reactor 2. The various sensors 11 and the analyzer 7 described above are controlled by the ECU 5. The ECU 5 electronically controls devices such as various valves or pumps as well as the sensor 11 and the analyzer 7. More specifically, the ECU 5 uses the information measured by the sensor 11 or by the analyzer 7 after being measured from the sensor 11 and the reducing agent supply line 4. The associated component (s) is controlled to control the amount of reducing agent such as NH 3 or urea. In this case, the information used by the ECU 5 includes a measured value of NOx and / or NH3 among various measured values by the sensors 11. In addition, the ECU 5 may control an air soot blower system 8 described in detail below by a differential pressure gauge or a time difference, and may also control a temperature of the heater 21 of the DPF system. have.

In addition, the system of the present embodiment is an OBM system 6 (On Board Monitering System), which is responsible for controlling the entire system and / or monitoring the system, turning the system on and off, and displaying pollutant (especially NOx) reduction efficiency. The OBM system 6 is configured to enable wired and wireless communication with the ECU 5 and has a function of mode switching of all functions of the ECU 5 to automatic control or manual control. In addition, the OBM system 6 may serve to monitor and / or store data acquired from the sensors 11 such as NOx, NH3, HC, SOx, SO2, CO, PM, CO2, O2, etc. in a control room or in the field. Can be.

On the other hand, in the use of the OBM system 6, it can be displayed on the monitor if the mode of the unit of the exhaust gas used in the ship or the land plant to the desired unit. In particular, in the case of ships, the unit of exhaust gas is expressed in g / kWh according to IMO regulations. Therefore, it is necessary to input the coefficient of the ship engine specification to express the unit of exhaust gas in g / kWh. The OBM system 6 according to the present embodiment is configured such that a user can directly input a coefficient of a ship engine specification for indicating g / kWh, which is a ship's exhaust gas unit. Using the OBM system of this embodiment, for example, NOx, NH3, HC, SOx, SO2, CO can be displayed on the monitor in g / kWh or ppm and PM can be displayed in mg / m3, or g / kWh or ppm on the monitor. CO2, O2 can be displayed on the monitor in% or ppm.

As mentioned above, the ship's SCR system according to the present embodiment includes an air line 3 for supplying air to an air soot blower system 8 in or near the SCR reactor 2. . The air soot blower system 8 blows the air supplied from the air line 3 to the catalyst in the SCR reactor 2 to remove foreign matter trapped in the catalyst.

The SCR system of the ship according to the present embodiment includes a reducing agent supply line 4 to supply the reducing agent for NOx reduction as mentioned above into the SCR reactor 2. The reducing agent supply line 4 supplies NH 3 or urea into the SCR reactor 2, and the supplied NH 3 or urea causes a reduction reaction with NO x in the exhaust gas in the presence of a catalyst.

The aforementioned air line 3 comprises a line branching from the line facing the soot blower system to the reducing agent supply line 4. The structure of this airline 3 is hereinafter referred to as "two way". The two-way airline 3 is provided in which one line participates in the operation of the air soot blower system 8 described above and the other line carries NH3 or urea into the injection nozzle 12 in the SCR reactor 2. It acts as a push out.

In addition, the SCR system of the ship according to the present embodiment is provided with a damper (9) at the inlet side of the SCR reactor 2 to distribute the exhaust gas evenly to the catalyst. A mixer 10 for evenly mixing exhaust gas and urea / NH 3 is provided at the front end of the SCR reactor 2 upstream of the damper 9. Various sensors 11 are installed at the front end of the SCR reactor 2, which are arranged before exhaust gas is purified, that is, before the exhaust gas passes through the SCR reactor 2. This is to measure and analyze the content of NOx, NH3, PM, HC, SO ₂ , CO, CO ₂ or O _2, etc. This analyzed information is based on the component information in the purified exhaust gas which has passed through the SCR reactor 2. Can be prepared.

<제2 실시예: 원웨이 에어라인>Second Embodiment One-Way Airlines

Figure 2 shows well an SCR system of a ship according to a second embodiment of the present invention.

2, the ship's SCR system according to the present embodiment includes a reducing agent supply line (4) for supplying NH3 / urea to the SCR reactor (2), the reducing agent supply line (4), the foregoing implementation Without being connected to the example airline 3, it extends to the injection nozzle 12 in front of the SCR reactor 2. The reducing agent supply line 4 sends NH3 / urea directly to the injection nozzle 12 in the front end of the SCR reactor 2 by itself, i.e., a supply means such as a self-contained pump, thereby simplifying the piping. More urea or NH3 can be used for NOx reduction. To this end, the pump itself or a control line connected to the pump may be equipped with devices for controlling the flow rate of urea or NH3. Thereby, the air line 3 comprises one line which participates in the operation of the air soot blower system 8, hereinafter referred to as 'one-way air line'. The rest of the configuration of this embodiment is the same as in the first embodiment, so detailed description thereof will be omitted.

<제3 실시예: 내진/면진/제진을 위한 방진장치><Third Embodiment: Dustproof Device for Seismic / Isolation / Vibration Prevention>

3 shows an SCR system of a ship according to a third embodiment of the present invention.

Referring to FIG. 3, in the SCR system of a ship according to the present embodiment, a vibration isolator 14 for earthquake-proof / isolation- / vibration-proofing is installed in the SCR reactor 2. Since the ship moves by sea or by sea or the like, the vibration is severe and the load is variable. Correspondingly, the present system is constructed by providing a vibration isolator 14 in the SCR reactor 2. At this time, the vibration isolator 14 may consider a variety of structures, but the suspension structure is preferred. In addition, the tubes of the front and rear ends of the SCR reactor 2 have a flexible connection structure so that the dustproof device 14 works well on the SCR reactor 2. In this embodiment, the flexible joint 13 was used for pipe connection at the front end and the rear end of the SCR reactor 2. The system shown in FIG. 3 is a system comprising a one-way airline 3.

However, the vibration isolator 14 may also be applied to a system including a two-way airline, and the configuration of the SCR system including the dustproof device 14 and the two-way airline 3 is illustrated in FIG. 4.

The remaining configuration is not significantly different from the foregoing first and second embodiments, and therefore, description of the remaining configuration will be omitted.

<제4 실시예: 바이패스 시스템>Fourth Embodiment Bypass System

5 shows an SCR system of a ship according to a fourth embodiment of the present invention.

Referring to FIG. 5, when an abnormal situation and / or emergency occurs, the SCR system of the ship according to the present embodiment maintains the operation of the exhaust gas facility 1 as it is, in particular, of the SCR reactor 2. It includes a bypass system that allows replacement or repair of faulty parts).

In the present embodiment, the bypass system includes a bypass line 16 and

bypass dampers

17, 17. Both ends of the bypass line 16 are connected to the front end and the rear end of the SCR reactor 2, respectively. In the steady state, the gas flowing through the SCR reactor 2 flows in a abnormal or emergency situation by bypassing the SCR reactor 2 through the bypass line 16 from the front end to the rear end of the SCR reactor 2 without passing through the SCR reactor 2. The pair of

bypass dampers

17 and 17 are respectively provided at both ends of the bypass line 16, and in a normal state, both ends of the bypass line 8 are closed and the passage of the SCR reactor 2 is opened. However, in an abnormal or emergency situation, both ends of the bypass line 16 are opened and the passage of the SCR reactor 2 is closed.

At this time, the bypass system is configured to be controlled by the ECU 5 when it is determined to be an emergency by the above-described sensor 11, the analyzer 7 and / or the OBM system 6. The ECU 5 may simultaneously control the

bypass dampers

17 and 17 to open both ends of the bypass line 16 and close the passage of the SCR reactor 2 in the event of an emergency.

The SCR system shown in FIG. 5 is an SCR system of a ship comprising a one-way airline 3. However, the bypass line and the bypass dampers may also be applied to a system including the two-way airline, and the SCR system including the bypass line 16 and the bypass dampers 17 and the two-way airline 3 may be applied. The configuration is shown in FIG.

<변형 실시예>Modified Example

In the foregoing embodiment, it was mainly introduced that the DPF system including the heater 21 and the DPF device 30 is installed upstream of the SCR reactor 2. However, as shown in FIG. 7, an SCR system of a ship or a land plant in which a DPF system including a heater 31 and a DPF device 30 is provided only downstream of the SCR reactor 2 may also be considered. The DPF system downstream of the SCR reactor 2 is disposed between the SCR SCR reactor 2 and the sensor 11 downstream thereof with the heater 31 and the DPF device 30. Also in this embodiment, the heater 31 burns soot, dust or foreign matter in the exhaust gas, and the DPF device 30 filters PM, dust or fine dust in the exhaust gas from the rear end of the heater 31. Take it out and reduce it.

<변형 실시예>Modified Example

Claims

An SCR system for a ship or a land plant for purifying and exhausting the exhaust gas from an exhaust gas installation in a ship or a land plant,

An SCR reactor for removing NOx comprising a catalyst activated by exhaust gas from the exhaust gas facility;

A reducing agent supply line for supplying NH3 or urea to the reducing agent supply position upstream of the SCR reactor;

Sensors for measuring components in exhaust gas at least through the SCR reactor; And

SCR system for a ship or a land plant, characterized in that the ECU for controlling the supply amount of the reducing agent through the reducing agent supply line using the information obtained from the sensors.
The SCR system for a ship or a land plant according to claim 1, wherein an abnormality of the sensors is checked by the ECU.
The method of claim 1, further comprising an air soot blower for blowing the air supplied from the air line to the catalyst to remove the foreign matter trapped in the catalyst, the amount of air blowing to the catalyst is controlled by the ECU SCR system for ship or land plant.
The SCR system of claim 1, wherein the ECU controls the supply amount of the reducing agent based on the NOx amount and the NH3 amount information among the information obtained from the sensors.
The SCR system for a ship or land plant according to claim 1, further comprising an analyzer for analyzing the information measured by the sensors and providing the same to the ECU.
The SCR system of a ship or land plant according to claim 1, further comprising an OBM system that communicates with the ECU in a wired or wireless manner and monitors data obtained from the sensors.
The SCR system of a ship or land plant according to claim 1, further comprising an OBM system that communicates with the ECU in a wired or wireless manner and monitors and stores data obtained from the sensors.
The ship or land vehicle according to claim 7, wherein the OBM system is configured to directly input a coefficient of a ship engine specification, and is configured to display a monitor by changing a mode of the exhaust gas into a unit desired by a user. SCR system for the plant.
The ship or the land of claim 8, wherein the OBM system has a function of selecting a unit of NOx, NH3, HC, SOx, SO2, or CO component in the exhaust gas as one of g / kWh or ppm and displaying it on a monitor. SCR system for the plant.
The SCR system according to claim 8, wherein the OBM system has a function of selecting one of mg / m3, g / kWh, or ppm as a unit of PM component in exhaust gas and displaying the same on a monitor.
The SCR system according to claim 8, wherein the OBM system has a function of displaying a unit of CO2 or O2 component in exhaust gas in% or ppm on a monitor.
The SCR system according to claim 6, wherein the OBM system causes all functions of the ECU to be switched to a mode by automatic control or manual control.
The method of claim 1, wherein the first pipe and the second connection structure is disposed in the front pipe and the rear pipe of the SCR reactor, respectively, and the SCR reactor or the same between the first connection structure and the second connection structure SCR system for a ship or a land plant, characterized in that the anti-vibration device is installed to support the pipes on both sides connected with.
The system of claim 1, further comprising a bypass system for bypassing the exhaust gas from the exhaust gas facility from the SCR reactor in an abnormal state, wherein both ends of the exhaust system are connected to the front and rear pipes of the reactor. A bypass damper connected to each other and a bypass damper installed at both ends of the bypass line to close the bypass line in a normal state and open the bypass line in an abnormal state, and the ECU includes the bypass. SCR system for a ship or land plant, characterized in that for controlling the dampers.
The SCR system of claim 1, wherein the catalyst is activated and usable at a reaction temperature of 200 ° C to 500 ° C.
The method of claim 1, wherein the exhaust gas is heated to burn soot, dust or foreign matter in the exhaust gas, and a diesel particulate filter for reducing PM, dust, or fine dust in the exhaust gas at a rear end of the heater. SCR system for a ship or a land plant, characterized in that it comprises a filter device.
The SCR system according to claim 16, wherein the heater and the DPF device are located between the exhaust gas facility and the SCR reactor.
18. The SCR system according to claim 17, wherein the heater and the DPF device are located upstream of the reducing agent supply position.
The SCR system according to claim 16, wherein the heater and the DPF device are located downstream of the SCR reactor.
An SCR system for a ship or a land plant for purifying and exhausting the exhaust gas from an exhaust gas installation in a ship or a land plant,

An SCR reactor for removing NOx comprising a catalyst activated by exhaust gas from the exhaust gas facility;

A reducing agent supply line for supplying NH3 or urea to the reducing agent supply position upstream of the SCR reactor;

A heater for heating the exhaust gas to burn soot, dust or foreign matter in the exhaust gas; And

SCR system for a ship or a land plant, characterized in that it comprises a diesel particulate filter (DPF) device for reducing PM, dust or fine dust in the exhaust gas at the rear end of the heater.