KR20140076769A - Exhaust gas purification system - Google Patents

Abstract

Disclosed is an exhaust gas purification system. The exhaust purification system according to a first embodiment of the present invention comprises: a main reactor for generating ammonia from solid ammonium salt; a dosing module connected to the main reactor for regulating the supply of the ammonia discharged from the main reactor; an injection nozzle connected to the dosing module and arranged inside an exhaust pipe to inject the ammonia to the exhaust pipe; and an air supplier for supplying air to an ammonia supply line between the main reactor and the dosing module.

Description

[0001] EXHAUST GAS PURIFICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying system, and more particularly, to an exhaust gas purifying system for reducing harmful substances contained in automobile exhaust gas using solid ammonium salts.

BACKGROUND ART Generally, as a technique for reducing nitrogen oxides emitted from internal combustion engines, particularly diesel engines, nitrogen oxides are reacted on a catalyst using ammonia, urea, or hydrocarbons as a reducing agent or a reducing agent by exhaust gas recirculation (EGR; Exhaust Gas Recirculation) And Selective Catalytic Reduction (SCR) which is reduced to oxygen have been used.

In the case of using diesel or other hydrocarbons in the selective reduction catalyst technique, there is an advantage in that a supplementary reducing agent supply device is not necessary since the fuel of the internal combustion engine or the combustor is used as a reducing agent. However, when oxygen exists in the exhaust gas, The nitrogen oxide reduction performance is low.

Another selective reduction catalyst technique using liquid urea, which is another selective reduction catalyst technology, is a method in which a liquid urea prepared by dissolving urea, which is a solid substance at room temperature, in water is sprayed on an automobile exhaust pipe, And the resulting ammonia reduces nitrogen oxides to harmless nitrogen with the aid of selective reduction catalysts such as vanadium pentoxide (V2O5) or zeolite. The selective reduction catalyst using the liquid urea has an advantage that the catalytic reaction temperature range is wide and the durability is excellent, and a high nitrogen oxide purification efficiency of about 60 to 80% can be obtained.

However, the selective reduction catalyst technique using liquid urea as shown in FIG. 1 has a disadvantage in that a magnetic field container storing the liquid urea is mixed with water and thus becomes unnecessarily large. Further, the exhaust purification system using the liquid urea has disadvantages such as a storage container 3 for storing liquid urea, a pump 5 injection module 4, a mixer 6, and other additional devices. Further, after the engine is stopped, the liquid urea remains in the purifying system, and the remaining liquid urea is frozen in an external environment at a low temperature (-11 캜 or less), so that the purifying action of the exhaust gas is not achieved. . ≪ / RTI >

In order to compensate for the disadvantages of such liquid urea, a technique using solid urea (Korean Patent No. 10-0999571) has been proposed. However, since the solid urea has a high pyrolysis temperature of about 140 캜 and uses electric energy or exhaust heat energy, , It takes time until the solid urea is thermally decomposed to generate ammonia, and the uncleaned exhaust gas is discharged to the atmosphere for a time delayed until the ammonia is produced.

An object of the present invention is to provide an exhaust gas purifying system capable of preventing a problem that ammonia supplied for purification of exhaust gas is generated due to the solidification of the ammonia supply line, the valve, the nozzle, etc. and solidified by cooling.

According to a first embodiment of the present invention, there is provided a process for producing ammonia, comprising: a main reactor for producing ammonia from a solid ammonium salt; an dosing module connected to the main reactor for regulating the supply of ammonia discharged from the main reactor; An exhaust gas purifying system including an injection nozzle disposed inside the exhaust pipe and injecting ammonia into the exhaust pipe, and an air supplier for supplying air to the ammonia supply line between the main reactor and the dosing module.

According to a second embodiment of the present invention, there is provided a process for producing ammonia, comprising: a main reactor for producing ammonia from a solid ammonium salt; an dosing module connected to the main reactor and regulating the supply of ammonia discharged from the main reactor; An exhaust gas purifying system including an injection nozzle disposed inside the exhaust pipe and injecting ammonia into the exhaust pipe, and an exhaust gas supplier for supplying exhaust gas to the ammonia supply line between the main reactor and the dosing module.

According to a third embodiment of the present invention, there is provided an apparatus for producing ammonia, comprising: a main reactor for producing ammonia from a solid ammonium salt; an dosing module connected to the main reactor and regulating the supply of ammonia discharged from the main reactor; An exhaust gas purifier system including an exhaust gas purifier system including an exhaust gas purifier installed in an exhaust pipe and injecting ammonia into an exhaust pipe and an outside air supplier for supplying outside air supplied to a cylinder by a turbocharger to an ammonia supply line between the main reactor and the dosing module, Can be provided.

The exhaust gas purifying system according to various embodiments of the present invention can prevent various problems caused by the solidification of residual ammonia by discharging the ammonia remaining after the engine is stopped in the ammonia supply line, the dosing module, and the injection nozzle have.

Further, since the exhaust gas purifying system can be formed compact, it can be easily mounted on an unmounted vehicle.

1 is a schematic view showing a conventional NOx reduction system using liquid urea.
2 is a reaction system diagram of ammonia-generating solid materials.
3 is a schematic view showing a conventional NOx reduction system using solid urea.
4 is a schematic view showing an exhaust gas purifying system according to a first embodiment of the present invention;
Figures 5A-5C are schematic diagrams illustrating various embodiments of the main reactor disclosed in Figure 4;
Figures 6A-6C are schematic diagrams illustrating various embodiments of the dosing module disclosed in Figure 4;
7 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the first embodiment of the present invention.
FIG. 8 is a schematic view showing an exhaust gas purifying system according to a second embodiment of the present invention; FIG.
9 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the second embodiment of the present invention.
10 is a schematic view showing an exhaust gas purifying system according to a third embodiment of the present invention.
11 is a schematic view showing an exhaust gas purifying system according to a fourth embodiment of the present invention.
12 is a schematic view showing the internal state of the auxiliary reactor according to the operation of the auxiliary reactor heating means disclosed in FIG.
13 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the fourth embodiment of the present invention.
FIG. 14 is a schematic view showing an exhaust gas purifying system according to a fifth embodiment of the present invention; FIG.
15 is a flowchart showing an operation sequence of an exhaust gas purifying system according to a fifth embodiment of the present invention.

4 is a schematic view showing an exhaust gas purifying system according to the first embodiment of the present invention. 5A-5C are schematic diagrams illustrating various embodiments of the main reactor 100 disclosed in FIG. 6A-6C are schematic diagrams illustrating various embodiments of the dosing module 200 disclosed in FIG.

Referring to FIGS. 4 to 6C, the exhaust gas purifying system according to the first embodiment of the present invention includes a main reactor 100 for heating the solid ammonium salt S to produce ammonia.

The main reactor 100 may include a housing 120 having a receiving portion formed therein to receive the solid ammonium salt S therein and having an ammonia outlet 122 formed therein. At this time, the housing 120 may have a closed structure in which the solid ammonium salt (S) is received, and may have a structure in which one side is opened so that the solid ammonium salt (S) can be exchanged.

In the main reactor 100, when the housing 120 is opened at one side, the cover 110 may be coupled to one side of the housing 120 where the housing 120 is opened. The cover 110 is detachably coupled to the housing 120, and a temperature sensor 111 or a pressure sensor 112 may be formed.

 The housing 120 may be provided with a first heating means for heating the solid ammonium salt S contained therein. The first heating means may be formed in the housing 120 or in the wall of the housing 120. At this time, any one of the electric heater, the cooling water of the vehicle, and the exhaust gas may be used as the heat source.

When the first heating means is the electric heater 121, the electric heater 121 is formed on the wall of the housing 120, and the solid ammonium salt S heated and stored by the electric energy can be heated.

When the first heating means uses the cooling water as a heat source, a cooling water flow path 123 through which the cooling water can flow into the wall of the housing 120 may be formed. The cooling water flow path 123 may be embedded in the form of a coil along the wall of the housing 120. Accordingly, the solid ammonium salt S contained in the housing 120 can be heated by circulation of the cooling water heated through the engine 10. [

When the first heating means uses exhaust gas as a heat source, an exhaust gas flow path 124 through which the exhaust gas can flow may be formed in the wall of the housing 120. The exhaust gas flow path 124 is connected to an exhaust gas inflow pipe 21 for introducing exhaust gas from the exhaust pipe 20 to the exhaust gas flow path 124 and an exhaust gas flow path Can be connected to the exhaust gas outlet pipe (23) for allowing the exhaust gas to flow out to the exhaust pipe (20). At this time, the exhaust gas outflow pipe 23 may be provided with a blower 23 for facilitating the circulation of the exhaust gas. Accordingly, the solid ammonium salt S contained in the housing 120 can be circulated at a high temperature Of the exhaust gas.

Meanwhile, the housing 120 may further include a second heating means formed together with the first heating means for heating the solid ammonium salt S. At this time, the second heating means can heat the solid ammonium salt (S) together with the first heating means, and the first heating means and the second heating means can alternately heat the solid ammonium salt.

The second heating means may use either the electric heater, the exhaust gas or the cooling water of the vehicle as a heat source. For example, when the first heating means is the electric heater 121, the second heating means may use either exhaust gas or cooling water as a heat source. In addition, when the first heating means uses exhaust gas as a heat source, the second heating means can heat the solid ammonium salt S by using either the electric heater 121 or the cooling water as a heat source.

Thus, the solid ammonium salt (S) contained in the main reactor (100) can be rapidly heated by the first heating means and the second heating means. When either the first heating means or the second heating means uses the electric heater 121 as a heat source because the first heating means and the second heating means can be alternately operated, The power consumed by the heater 121 can be minimized.

The exhaust gas purifying system according to the first embodiment of the present invention includes a dosing module 200 formed in the ammonia supply line 400 between the main reactor 100 and the injection nozzle 300. The dosing module 200 may control the amount of ammonia flowing out from the main reactor 100 to be supplied to the injection nozzle 300 at a constant pressure and a predetermined amount.

The dosing module 200 may include a valve body 210 having an ammonia flow path 220 formed therein. The valve body 210 may include a pressure regulator 230 formed in the ammonia flow path 220 to regulate the ammonia flow pressure. The valve body 210 may include a control valve 240 formed in the ammonia passage 220 to control the amount of ammonia discharged. Further, a temperature sensor 260 for sensing the temperature of the valve body 210 may be further formed.

The valve body 210 may be formed with a third heating means or a fourth heating means for heating the valve body 210 to a pyrolysis temperature or higher of the solid ammonium salt S. At this time, the third heating means and the fourth heating means may be formed together in the valve body 210, and either the third heating means or the fourth heating means may be formed. In addition, when the third heating means and the fourth heating means are formed together, the valve body 210 can be heated at the same time, and the valve body 210 can be alternately heated.

On the other hand, the third heating means and the fourth heating means may use any one of the electric heater 250, the exhaust gas and the cooling water as the heat source as the first heating means and the second heating means. In this case, when the third heating means or the fourth heating means uses cooling water or exhaust gas as a heat source, the cooling water flow path 270 and the exhaust gas flow path 280 may be formed in the valve body 210 .

The dosing module 200 may be capable of supplying a predetermined amount of ammonia from the main reactor 100 to the injection nozzle 300 side. In addition, by heating the valve body 210 to a pyrolysis temperature or more of the solid ammonium salt S, it is possible to prevent the ammonia from solidifying into the valve body 210 in a solid form.

The exhaust gas purifying system according to the first embodiment of the present invention includes an injection nozzle 300 connected to the dosing module 200 and the ammonia supply line 400. The injection nozzle 300 is disposed at a front end of the selective reduction catalyst (SCR) 30 in the exhaust pipe 20 and injects ammonia supplied from the dosing module 200 toward the selective reduction catalyst 30 .

The exhaust gas purifying system according to the first embodiment of the present invention includes an air supplier 500a for supplying air to the ammonia supply line 400 between the main reactor 100 and the dosing module 200. [ The air supplier 500a may be formed of any one of an air tank, a blower, and an air compressor, and may be connected to the ammonia supply line 400 and the air supply line 600a.

On the other hand, an opening / closing valve 410 may be formed at a connection point where the ammonia supply line 400 and the air supply line 600a are connected. The on-off valve 410 selectively controls the flow of ammonia and air supplied from the ammonia supply line 400 and the air supply line 600a. The on-off valve 410 is a two-way valve or a three- (3-way) valve. The one-way valve may be formed in the ammonia supply line 400 and the air supply line 600a of the main reactor 100, respectively. Hereinafter, for convenience of explanation, the opening / closing valve 410 will be mainly described as a three-way valve.

The exhaust gas purifying system according to the first embodiment of the present invention may include an electronic control unit (not shown). The electronic control unit may be electrically connected to the main reactor 100, the dosing module 200, the on-off valve 410, and a plurality of sensors to control the generation, supply, and flow of ammonia. At this time, the sensors may be formed in the main reactor 100, the dosing module 200, the exhaust pipe 20, and the like with sensors for sensing pressure, temperature, and nitrogen oxide (NOx)

7 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the first embodiment of the present invention.

Hereinafter, an operation method of the exhaust gas purifying system according to the first embodiment of the present invention will be described with reference to FIG.

First, the user operates the heating means of the main reactor 100 and the dosing module 200 at the start of the engine at the start of the vehicle to start the vehicle. At this time, among the heating means, the heating means which uses the electric heaters 121 and 250 as the heat source is operated simultaneously with the engine starting, and the heating means which uses the exhaust gas or the cooling water as the heat source heat the electric heaters 121 and 250, And is operated with a predetermined time difference with the heating means. This is because exhaust gas and cooling water do not have sufficient heat energy at the beginning of the engine. Further, when exhaust gas or cooling water has sufficient heat energy, a heating means using the electric heaters 121 and 250 as a heat source and a heating means using exhaust gas or cooling water as a heat source are operated together. On the other hand, if the heating of the main reactor 100 or the dosing module 200 is excessively performed, the operation of the heating means using the electric heaters 121 and 250 as a heat source is stopped and the exhaust gas or the cooling water is used as a heat source Only the heating means is activated.

On the other hand, when the solid ammonium salt (S) is heated by the heating means in the main reactor (100) and ammonia is produced, the internal pressure of the main reactor (100) increases due to the generated ammonia. When the inner pressure of the main reactor 100 reaches a predetermined level, the ammonia flows out of the main reactor 100 and flows to the dosing module 200.

The ammonia flowing into the dosing module 200 flows toward the injection nozzle 300 in a positive pressure and a predetermined amount by the pressure regulator 230 and the control valve 240 formed in the valve body 210, Is injected toward the selective reduction catalyst (30) inside the exhaust pipe (20) at a constant pressure and in a fixed amount to be mixed with the exhaust gas.

The exhaust gas mixed with the ammonia is purified by the selective reduction catalyst 30 and discharged to the atmosphere.

On the other hand, when the user stops the engine, the operation of the main reactor 100 heating means is stopped to prevent ammonia from being generated. At the same time when the heating means of the main reactor 100 is stopped, the open / close valve 410 is driven to close the ammonia supply line 400 on the main reactor 100 side and open the air supply line 600a side do.

When the air supply line 600a side is opened, the air supply unit 500a is driven to supply air to the dosing module 200 side. The air supplied to the dosing module 200 is discharged to the exhaust pipe 20 through the injection nozzle 300 through the dosing module 200. At this time, the ammonia remaining in the ammonia supply line 400, the dosing module 200, and the injection nozzle 300 is discharged together with the discharge of the air.

Accordingly, it is possible to prevent the ammonia remaining in the ammonia supply line 400, the dosing module 200, and the injection nozzle 300 from solidifying due to a temperature drop and clogging the solid state.

When the exhaust of the residual ammonia is completed by the air supplier 500a, the operation of the air supplier 500a and the heating of the dosing module 200 are stopped. Thereafter, the operation of the exhaust gas treatment system according to the first embodiment of the present invention is completed by driving the opening / closing valve 410, closing the air supply line 600a, and opening the ammonia supply line 400. [

Meanwhile, the operation end point of the exhaust gas processing system according to the first embodiment of the present invention may be the time when the operation of the air feeder 500a is started and the heating of the dosing module 200 is terminated. In this case, The opening and closing valve 410 may be driven to close the air supply line 600a and open the ammonia supply line 400. [

The driving of the overall configuration including the pressure regulator 230 and the metering valve 240 of the heating and dosing module 200 of the main reactor 100 and the dosing module 200 described above is performed by the electronic control unit, .

8 is a schematic view showing an exhaust gas purifying system according to a second embodiment of the present invention.

Referring to FIG. 8, the exhaust gas purifying system according to the second embodiment of the present invention includes a main reactor 100 for generating ammonia from a solid ammonium salt, a main reactor 100 connected to the main reactor 100, An injection nozzle 300 connected to the dosing module 200 and disposed in the exhaust pipe 20 for injecting ammonia into the exhaust pipe 20; And an exhaust gas supplier 500b for supplying exhaust gas to the ammonia supply line 400 between the main reactor 100 and the dosing module 200. [

The exhaust gas purifying system according to the second embodiment of the present invention may further include an exhaust gas purifying system electrically connected to the main reactor 100, the dosing module 200, the exhaust gas supplier 500b, , An electronic control unit (not shown) for controlling supply and flow.

Here, the main reactor 100, the dosing module 200, the injection nozzle 300, and the electronic control unit are the same as or similar to those described in the first embodiment, and a detailed description thereof will be omitted. The description will be focused on a configuration different from that of the first embodiment.

The exhaust gas supplier 500b may be formed on the exhaust gas supply line 600b with either a blower or an air compressor. One end of the exhaust gas supply line 600b is connected to the ammonia supply line 400 between the main reactor 100 and the dosing module 200 and the other end thereof is connected to the diesel particulate filter 40 ) Exhaust pipe 20 at the rear end side. Accordingly, the exhaust gas on the downstream side of the diesel particulate filter 40 can be supplied to the ammonia supply line 400 by the exhaust gas supplier 500b.

At this time, the exhaust gas on the downstream side of the diesel particulate filter 40 contains a large amount of particulate matter (PM) due to the combustion of the fuel, for the reason of supplying the exhaust gas on the downstream side of the diesel particulate filter 40. Accordingly, when the exhaust gas on the upstream side of the diesel particulate filter 40 is supplied to the ammonia or the supply line 400, the dosing module 200 including the ammonia supply line 400 and the injection nozzle 300 are damaged There is a concern. Therefore, in order to prevent this, exhaust gas passing through the diesel particulate filter 40 and having the particulate matter PM removed is supplied.

9 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the second embodiment of the present invention.

Hereinafter, an operation method of the exhaust gas purifying system according to the second embodiment of the present invention will be described with reference to FIG. In the method of operating the exhaust gas purifying system according to the second embodiment of the present invention, until the engine 10 is stopped, the operating method of the first embodiment is the same as or similar to that of the first embodiment, do. Hereinafter, an operation method after the engine 10 is stopped will be described in detail.

When the user stops the engine 10, both the main reactor 100 and the heating means of the dosing module 200 are terminated. The reason why the heating of the dosing module 200 is stopped simultaneously with the heating of the main reactor 100 as compared with the first embodiment is that the exhaust gas flowing into the dosing module 200 is hot, The module 200 does not need to be heated.

Next, the ammonia supply line 400 on the main reactor 100 side is closed by driving the on-off valve 410 simultaneously with stopping the heating of the main reactor 100 and the dosing module 200, The gas supply line 600b side is opened.

When the exhaust gas supply line 600b side is opened, the exhaust gas supplier 500b is driven to supply the exhaust gas to the dosing module 200 side. The exhaust gas supplied to the dosing module 200 is discharged to the exhaust pipe 20 through the injection nozzle 300 through the dosing module 200. At this time, the ammonia remaining in the ammonia supply line 400, the dosing module 200, and the injection nozzle 300 together with the exhaust gas is discharged. Accordingly, the ammonia supply line 400, the dosing module 200, and the injection nozzle 300 can prevent the remaining ammonia from solidifying due to a temperature drop and clogging in a solid state.

In addition, when exhaust gas is completely exhausted by the exhaust gas supplier 500b, the operation of the exhaust gas supplier 500b is stopped. Thereafter, the operation of the exhaust gas treatment system according to the second embodiment of the present invention is terminated by opening the shutoff valve 410, closing the exhaust gas supply line 600b, and opening the ammonia supply line 400. [

In addition, as in the first embodiment, the operation end point of the exhaust gas processing system according to the second embodiment of the present invention may be the time when the operation of the exhaust gas supplier 500b is terminated. And can be controlled by an electronic control unit.

10 is a schematic view showing an exhaust gas purifying system according to a third embodiment of the present invention.

10, the exhaust gas purifying system according to the third embodiment of the present invention includes a main reactor 100 for generating ammonia from a solid ammonium salt S, a main reactor 100 connected to the main reactor 100, A dosing nozzle 200 connected to the dosing module 200 and disposed in the exhaust pipe 20 for injecting ammonia into the exhaust pipe 20; And an outside air supply unit 500c for supplying outside air supplied to the cylinder by the turbocharger 700 to the ammonia supply line 400 between the main reactor 100 and the dosing module 200.

The exhaust gas purifying system according to the third embodiment of the present invention may further include an exhaust gas purifying system that is electrically connected to the main reactor 100, the dosing module 200, the outside air supply unit 500c, , An electronic control unit (not shown) for controlling supply and flow.

Since the main reactor 100, the dosing module 200, the injection nozzle 300, and the electronic control unit are the same as or similar to those described in the first and second embodiments, a detailed description thereof will be omitted Hereinafter, a configuration different from the above embodiments will be mainly described.

The outside air supply unit 500c may be formed on the outside air supply line 600c with either a blower or an air compressor. One side of the outside air supply line 600c is connected to the ammonia supply line 400 between the main reactor 100 and the dosing module 200 and the other side is formed between the supercharger 700 and the engine 10 And may be connected to the outside air discharge line 730. Accordingly, the outside air flowing through the outside air discharge line 730 can be supplied to the ammonia supply line 400 by the outside air supply unit 500c.

In the operation method of the exhaust gas purifying system according to the third embodiment of the present invention, the difference in that the outside air supply device 500c is configured in correspondence with the air supply device 500a as compared with the first embodiment It may be the same as or similar to the operating method of the first embodiment.

11 is a schematic view showing an exhaust gas purifying system according to a fourth embodiment of the present invention. 12 is a schematic view showing an internal state of the auxiliary reactor 800 according to the operation of the auxiliary reactor heating means 810 disclosed in FIG.

11 and 12, the exhaust gas purifying system according to the fourth embodiment of the present invention includes a main reactor 100 for generating ammonia from a solid ammonium salt S, An auxiliary reactor 800 formed in the ammonia supply line 400 and a dosing module 200 connected to the auxiliary reactor 400 for regulating the supply of ammonia discharged from the main reactor 100 and the auxiliary reactor, And an injection nozzle 300 connected to the dosing module 200 and disposed inside the exhaust pipe 20 for injecting ammonia into the exhaust pipe 20.

The exhaust gas purifying system according to the fourth embodiment of the present invention may further include an exhaust gas purifying system connected electrically to the main reactor 100, the dosing module 200, the auxiliary reactor 800, , An electronic control unit (not shown) for controlling supply and flow.

Here, the main reactor 100, the dosing module 200, the injection nozzle, and the electronic control unit are the same as or similar to those described in the above-described embodiments, and a detailed description thereof will be omitted. Will now be described with reference to a configuration different from the above-described embodiments.

The exhaust gas purifying system according to the fourth embodiment of the present invention is connected to the ammonia supply line 400 between the main reactor 100 and the dosing module 200, Any one of the air feeder 500a, the exhaust gas feeder 500b and the outside air feeder 500c disclosed in the first to third embodiments may be formed for discharging.

The auxiliary reactor 800 is configured to supply ammonia to the exhaust pipe at the same time as the engine starts at the time of starting the engine. The ammonia supply line 400 between the main reactor 100 and the dosing module 200 supplies the ammonia May be formed along the longitudinal direction of the line 400.

The auxiliary reactor 800 may have an internal space for receiving the solid ammonium salt S, and the ammonia inlet and outlet may be formed in the same line as the ammonia supply line 400. Further, auxiliary reactor heating means 810 for heating the solid ammonium salt (S) contained in the internal space may be formed. At this time, the auxiliary reactor heating means 810 may be formed of an electric heater to rapidly heat the solid ammonium salt S contained therein.

The auxiliary reactor 800 as described above rapidly heats the received solid ammonium salt S to generate ammonia, and thus the exhaust gas is not purified for a time delayed until the ammonia is produced and discharged from the main reactor 100 And can be prevented from being discharged to the atmosphere.

In addition, the amount of the solid ammonium salt S contained in the auxiliary reactor 800 may be exhausted as the ammonia is generated and heated until the ammonia is generated and discharged from the main reactor 100 at the start of the engine. Further, after the engine is stopped, the ammonia remaining in the ammonia supply line 400 formed with the auxiliary reactor 800 may be cooled and solidified in the receiving portion of the auxiliary reactor in the form of a solid ammonium salt (S). That is, the solidified ammonium salt (S) solidified is converted into ammonia again at the start, so that the exhaustion and solidification of the solid ammonium salt (S) are repeatedly generated in the containing portion of the auxiliary reactor (800) ≪ / RTI >

FIG. 13 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the fourth embodiment of the present invention.

Hereinafter, an operation method of the exhaust gas processing system according to the fourth embodiment of the present invention will be described with reference to FIG.

First, the user operates the heating means of the main reactor 100, the dosing module 200, and the auxiliary reactor 800 at the start of the engine to start the engine. The solid ammonium salt S contained in the auxiliary reactor 800 is rapidly heated by the auxiliary reactor heating means 810 to be converted into ammonia and the generated ammonia is supplied to the dosing module 200 and the injection nozzle 300, And is supplied to the exhaust pipe 20 at the same time as the engine starts.

The amount of the solid ammonium salt S contained in the auxiliary reactor 800 is small so that the amount of the solid ammonium salt S after the start of the engine and after the ammonia is generated and supplied from the main reactor 100, Is exhausted and ammonia is not produced. However, the auxiliary reactor heating means 810 is continuously operated to prevent the auxiliary reactor 800 from being cooled by an external environment.

Among the heating means for heating the main reactor 100 and the dosing module 100, the heating means using the electric heater 121 as a heat source are operated at the same time as the engine starts, and the exhaust gas or the cooling water is used as a heat source The heating means is operated with a predetermined time difference from the heating means using the electric heater 121 as a heat source. Thereafter, when the exhaust gas or the cooling water has sufficient heat energy, the heating means that uses the electric heater 121 as a heat source and the heating means that uses the exhaust gas or the cooling water as a heat source are simultaneously operated.

If the temperature of the main reactor 100 or the dosing module 200 excessively increases or the operation of the heating means using the electric heater 121 as a heat source is not required, Only the heating means for stopping the operation of the heating means as the heat source and using the exhaust gas or the cooling water as the heat source is operated.

Meanwhile, when the main reactor 100 is heated to generate ammonia from the solid ammonium salt S, the internal pressure of the main reactor 100 is increased by the generated ammonia. When the internal pressure of the main reactor 100 reaches a predetermined level, ammonia generated in the main reactor 100 flows out of the main reactor 100 and flows to the dosing module 200.

The ammonia introduced into the dosing module 300 is supplied to the injection nozzle 300 at a constant pressure and a predetermined amount and the ammonia supplied to the injection nozzle 300 is injected toward the selective reduction catalyst 30 inside the exhaust pipe (NOx) is purified by the selective reduction catalyst 30 after being mixed with the exhaust gas, and is discharged to the atmosphere.

On the other hand, when the user stops the engine, the heating of the main reactor 100 and the auxiliary reactor 800 is stopped. The ammonia supply line 400 on the side of the main reactor 100 and the auxiliary reactor 800 is closed by driving the on-off valve 410 simultaneously with the heating and stopping of the main reactor 100 and the auxiliary reactor 800, The air supply line 600a side is opened.

When the air supply line 600a is opened, the air supply unit 500 is driven to supply air to the dosing module 200 side. The air supplied to the dosing module 200 is discharged to the exhaust pipe 300 through the injection nozzle 300. At this time, the ammonia remaining in the ammonia supply line 400, the dosing module 200, and the injection nozzle 300 is discharged together with the discharge of the air, so that the remaining ammonia is solidified by the temperature decrease, Can be prevented.

When the discharge of residual ammonia is completed by the air supplier 500a, the operation of the air supplier 500a and the heating of the dosing module 200 are stopped. Thereafter, the operation of the exhaust gas treatment system according to the fourth embodiment of the present invention is ended by driving the opening / closing valve 410, closing the air supply line 600a and opening the ammonia supply line 400. [

The operation termination time of the exhaust gas treatment system according to the fourth embodiment of the present invention may be determined by heating the air supply device 500a and the dosing module 200 such that the amount of ammonia solidified in the auxiliary reactor 800 can be increased, In this case, the opening / closing valve 410 is driven at the same time as the engine is started, so that the air supply line 500a is closed and the ammonia supply line 400 is opened.

14 is a schematic view showing an exhaust gas purifying system according to a fifth embodiment of the present invention.

14, the exhaust gas purifying system according to the fifth embodiment of the present invention includes a main reactor 100 for generating ammonia from a solid ammonium salt, an auxiliary reactor 800 formed in the main reactor 100, A dosing module 200 connected to the main reactor 100 and adapted to regulate the supply of ammonia discharged from the main reactor 100 and the auxiliary reactor 800 and connected to the dosing module 200, And an injection nozzle 300 disposed in the exhaust pipe 10 for injecting ammonia into the exhaust pipe 20.

The exhaust gas purifying system according to the fifth embodiment of the present invention is electrically connected to the main reactor 100, the dosing module 200, the auxiliary reactor 800, and a plurality of sensors to generate ammonia, And an electronic control unit (not shown) for controlling supply and flow.

Here, the main reactor 100, the dosing module 200, the injection nozzle 300, and the electronic control unit are the same as or similar to those described in the above-described embodiments, Hereinafter, a configuration different from the above-described embodiments will be mainly described.

The exhaust gas purifying system according to the fifth embodiment of the present invention is connected to the ammonia supply line 400 between the main reactor 100 and the dosing module 200, Any one of the air feeder 500a, the exhaust gas feeder 500b and the outside air feeder 500c disclosed in the first to third embodiments may be formed for discharging.

The auxiliary reactor 800 may be configured in the main reactor 100 to supply ammonia to the exhaust pipe 20 at the same time when the engine is started. More specifically, the auxiliary reactor 800 may be disposed on the wall with a thickness corresponding to the housing wall formed with the ammonia outlet 122 of the main reactor 100.

The auxiliary reactor 800 may have an internal space for receiving the solid ammonium salt S and an ammonia inlet may be adjacent to the housing space of the housing and an outlet may be formed in the housing 120 of the main reactor 100 May be formed in the same manner as the formed outlet 122.

The auxiliary reactor 800 may further include auxiliary reactor heating means 810 for heating the solid ammonium salt S contained therein. At this time, the auxiliary reactor heating means 810 may be formed of an electric heater to rapidly heat the solid ammonium salt S contained therein.

The auxiliary reactor 800 as described above rapidly heats the received solid ammonium salt S to generate ammonia, and thus the exhaust gas is not purified for a time delayed until the ammonia is produced and discharged from the main reactor 100 And can be prevented from being discharged to the atmosphere.

The amount of the solid ammonium salt (S) contained in the auxiliary reactor (800) is so small that when the engine is started, ammonia is generated in the main reactor (100) Most of the amount can be exhausted. Also, after the engine is stopped, the ammonia remaining in the ammonia supply line 400 formed with the auxiliary reactor 800 may be cooled and solidified in the receiving portion of the auxiliary reactor 800 in a solid ammonium salt state. That is, the solidified ammonium salt (S) is solidified and converted into ammonia at the start, so that the exhaustion and solidification of the solid ammonium salt (S) can be repeatedly performed in the containing portion of the auxiliary reactor (800) .

FIG. 15 is a flowchart showing an operation sequence of the exhaust gas purifying system according to the fifth embodiment of the present invention.

Hereinafter, an operation method of the exhaust gas processing system according to the fifth embodiment of the present invention will be described with reference to FIG.

First, the user operates the heating means of the main reactor 100, the dosing module 200, and the auxiliary reactor 800 at the start of the engine to start the engine. At this time, ammonia is generated simultaneously with engine startup by the auxiliary reactor 800, and the generated ammonia is supplied to the exhaust pipe 20.

The amount of the solid ammonium salt S contained in the auxiliary reactor 800 is small so that after the engine is started and ammonia is generated from the main reactor 100 and supplied, Stop operation. This is because the auxiliary reactor 800 is in a state of receiving heat by the heating means formed in the main reactor 100, so that the problem of being cooled by the external environment does not occur.

Hereinafter, from the engine stop to the ending point, the fourth embodiment is similar to or similar to the above-described fourth embodiment of the present invention, and a detailed description thereof will be omitted.

As described above, the exhaust gas purifying system according to various embodiments of the present invention is advantageous in that it is unnecessary to construct a separate social infrastructure because the solid ammonium salt S can be used at a repair shop or the like in accordance with a maintenance cycle.

In addition, after the engine is stopped, by discharging the remaining ammonia through various fluids, it is possible to solve various problems that are caused by the solidification of the residual ammonia in the ammonia supply line 400, the dosing module 200, and the injection nozzle 300 Can be solved.

Further, ammonia is rapidly supplied from the auxiliary reactor 800 at the same time as the engine is started, thereby purifying the exhaust gas which can be discharged in an unclean state during the delay from the main reactor 100 to the generation of ammonia, The gas purification efficiency can be maximized.

In addition, since the auxiliary reactor 800 is formed in the ammonia supply line 400 or the main housing 100, a separate structure such as a back flow valve is not required, so that a compact system can be manufactured. .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, many modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

S: Solid ammonium salt
100: main reactor
110: cover 120: housing
121, 250: Electric heater 122: Ammonia outlet
123, 270: cooling water flow line 124, 280: exhaust gas flow line
200: dosing module
230: Pressure regulator 240: Regulating valve
300: injection nozzle

Claims (24)

A main reactor for producing ammonia from the solid ammonium salt,
A dosing module connected to the main reactor and regulating the supply of ammonia discharged from the main reactor;
An injection nozzle connected to the dosing module and disposed inside the exhaust pipe to inject ammonia into the exhaust pipe,
And an air supplier for supplying air to the ammonia supply line between the main reactor and the dosing module. A main reactor for producing ammonia from the solid ammonium salt,
A dosing module connected to the main reactor and regulating the supply of ammonia discharged from the main reactor;
An injection nozzle connected to the dosing module and disposed inside the exhaust pipe to inject ammonia into the exhaust pipe,
And an exhaust gas supplier for supplying an exhaust gas to an ammonia supply line between the main reactor and the dosing module. A main reactor for producing ammonia from the solid ammonium salt,
A dosing module connected to the main reactor and regulating the supply of ammonia discharged from the main reactor;
An injection nozzle connected to the dosing module and disposed inside the exhaust pipe to inject ammonia into the exhaust pipe,
And an outside air supply system for supplying outside air supplied to the cylinder by the supercharger to the ammonia supply line between the main reactor and the dosing module. The method according to any one of claims 1 to 3,
And an electronic control unit. The method according to any one of claims 1 to 3,
Wherein the main reactor is provided with a first heating means for heating the solid ammonium salt. The method of claim 5,
Wherein the first heating means uses any one of an electric heater, exhaust gas and cooling water as a heat source. The method according to any one of claims 1 to 3,
Wherein the main reactor is provided with a second heating means for heating the solid ammonium salt. The method of claim 7,
Wherein the second heating means uses any one of an electric heater, exhaust gas and cooling water as a heat source. The method according to any one of claims 1 to 3,
Wherein the main reactor has one of an exhaust gas flow passage through which exhaust gas flows or a cooling water flow passage through which cooling water flows. The method of claim 9,
The exhaust gas flow path includes:
An exhaust gas inflow pipe through which exhaust gas flows from the exhaust pipe and an exhaust gas outlet pipe through which the inflowing exhaust gas flows out into the exhaust pipe. The method of claim 10,
And a blower is formed in the exhaust gas outlet pipe. The method according to any one of claims 1 to 3,
Wherein the main reactor comprises:
A housing in which an inner space is formed to accommodate the solid ammonium salt,
A cover coupled to an open side of the housing,
And a sensor portion formed on the cover. The method of claim 12,
The sensor unit includes:
An exhaust gas purification system comprising either a pressure sensor or a temperature sensor The method according to any one of claims 1 to 3,
Wherein the dosing module is provided with a third heating means. 15. The method of claim 14,
Wherein the third heating means uses any one of an electric heater, exhaust gas and cooling water as a heat source. The method according to any one of claims 1 to 3,
Wherein the dosing module is provided with a fourth heating means. 18. The method of claim 16,
Wherein the fourth heating means uses any one of an electric heater, exhaust gas and cooling water as a heat source. The method according to any one of claims 1 to 3,
Wherein the dosing module is formed with an exhaust gas flow passage through which exhaust gas flows or a cooling water flow passage through which cooling water flows. The method according to any one of claims 1 to 3,
The dosing module comprises:
A valve body,
An ammonia flow passage formed through the valve body,
A pressure regulator formed in the ammonia flow path to regulate an ammonia flow pressure;
A regulating valve formed in the ammonia passage for regulating the amount of ammonia discharged, and
And a temperature sensor formed on the valve body. The method according to any one of claims 1 to 3,
Wherein an open / close valve is formed at a connection point where the air supply unit, the exhaust gas supply unit, and the outside air supply unit are connected to the ammonia supply line. The method of claim 20,
Wherein the on-off valve is formed of one of a two-way (2-Way) valve and a three-way (2-way) valve. The method according to claim 1,
The air supply device
An air tank, a blower, and an air compressor. The method according to claim 2 or 3,
Wherein the exhaust gas supply device and the outside air supply device comprise:
The exhaust gas purifying system being formed of one of a blower and an air compressor. The method of claim 2,
The exhaust gas supply device includes:
And supplying exhaust gas on a downstream side of the diesel particulate filter formed in the exhaust pipe to the ammonia supply line.

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