KR102075268B1 - Continuous Processing System Of Hazardous Substances In Exhaust Gas - Google Patents

Abstract

The present invention relates to a system for reducing and treating nitrogen oxides (NOx) and sulfur oxides (SOx) contained in the exhaust gas of a ship, particularly a system capable of regenerating catalysts in any one of multiple zones where the NOx and the Sox are removed so that the hazardous substances contained in the exhaust gas can be continuously reduced by switching a flow path of the exhaust gas. To this end, according to the present invention, the system for continuous treatment of hazardous substances in an exhaust gas comprises: a front end reactor to which a front end exhaust pipe extending from an engine is connected, and in which an absorbent line for reducing the hazardous substances in the exhaust gas through catalytic reaction and supplying an absorbent thereinto is installed; a rear end reactor in which an absorber line for reducing the harmful substances in the exhaust gas through catalytic reaction and supplying the absorbent thereinto is installed, and from which a rear end exhaust pipe for discharging the exhaust gas into the atmosphere extends; and an exhaust gas switching line which switches a flow direction of the exhaust gas so that the exhaust gas in the front end exhaust pipe is introduced into the rear end reactor, flows to the front end reactor, and is discharged into the atmosphere through the rear end exhaust pipe, wherein the exhaust gas in the front end exhaust pipe is discharged through the rear end exhaust pipe after being introduced into the front end reactor and flowing into the rear end reactor, or after being introduced into the rear end reactor and flowing into the front end reactor through the exhaust gas switching line.

Description

Continuous Processing System of Hazardous Substances In Exhaust Gas}

The present invention relates to a system for reducing nitrogen oxides (NOx) and sulfur oxides (SOx) contained in the exhaust gas of the ship, in particular in the removal of nitrogen oxides (NOx) and sulfur oxides (SOx) in a plurality of zones. The catalyst can be regenerated in any one of the zones so that the harmful substances contained in the exhaust gas can be continuously reduced by switching the flow path of the exhaust gas.

Due to the rapid industrialization of modern society, the consumption of fossil fuels has increased, and air pollution due to harmful substances generated in the combustion process is serious.

The main causes of air pollution are nitrogen oxides (NOx), sulfur oxides (SOx), and fine dust (PM).

As awareness of environmental preservation increases, emission regulations for exhaust gases are strictly enforced. In particular, in the field of ships, the International Maritime Organization (IMO), a subsidiary of the United Nations, regulates the emission of NOx and SOx contained in exhaust gases emitted from ships.

SCR (SELECTIVE CATALYTIC REDUCTION) is a technology for removing NOx from ship's exhaust gas. SCR is a technology that converts NOx into nitrogen and water by injecting ammonia or urea into the catalyst.

Techniques for removing SOx from ships are divided into wet and dry, where wet is to remove sulfur oxides with seawater or alkaline solutions, and dry is to remove sulfur oxides using calcium hydroxide or sodium-based absorbents.

These NOx and SOx removal technologies are separate, and it was difficult to apply the removal technology to ships continuously.

Even if individual NOx and SOx removal technologies are applied to a ship, a significant installation space is required to construct a NOx removal device and a SOx removal device in a ship, and thus the space utilization inside the ship is lowered. There is this.

In addition, the conventional catalyst cannot be regenerated during the removal of NOx and SOx, so that a catalyst regeneration system must be provided separately, and a cleaning operation must be performed through the catalyst regeneration system for regeneration of the catalyst at any time.

As such, in the related art, as the regeneration of the catalyst is additionally performed, there is a disadvantage in that the reduction system of NOx and SOx should be operated intermittently.

Republic of Korea Patent Application Publication No. 2000-0017881 (published 2000.04.06) Republic of Korea Patent Publication No. 10-2017-0080771 (Published Date 2017.07.11)

The present invention is invented to solve the problems of the prior art as described above, by removing the harmful substances using a renewable catalyst by a sodium hydroxide or calcium hydroxide-based absorbent supplied to remove the harmful substances in the exhaust gas and In addition, by regenerating the catalyst and changing the inflow direction of the exhaust gas so that the exhaust gas is introduced into the catalyst regenerated zone, it is possible to continuously remove or reduce the harmful substances contained in the exhaust gas without requiring a separate catalyst regeneration work as in the prior art. The aim is to provide a continuous treatment system for hazardous substances that can be configured.

In order to achieve the above object, the exhaust gas toxic material continuous treatment system according to the present invention is connected to a shear exhaust pipe extending from the engine and reduces the harmful material of the exhaust gas through a catalytic reaction, and an absorbent for supplying an absorbent therein. A front end reactor with a line installed, a rear end reactor with an absorbent line for reducing harmful substances in exhaust gas through a catalytic reaction and supplying an absorbent therein, and an extended end exhaust pipe for exhausting exhaust gas into the atmosphere, and a front end exhaust pipe And an exhaust gas conversion line for changing the flow direction of the exhaust gas so that the exhaust gas flows into the rear reactor and flows through the front end reactor and is exhausted to the atmosphere through the rear end exhaust pipe. After the flow to the rear reactor, the exhaust pipe of the rear end is exhausted or And that flows into the rear end of the reactor via gas line switching is to be evacuated to a rear end of the exhaust pipe and then flows into the front end reactor to technical features.

In addition, according to a preferred embodiment of the present invention, the shear exhaust pipe is provided with a reducing agent supply line for supplying a reducing agent to the exhaust gas.

In addition, according to a preferred embodiment of the present invention, the exhaust gas containing the reducing agent is introduced into the front end reactor or through the exhaust gas conversion line to the rear stage reactor is reduced nitrogen oxide contained in the exhaust gas through the catalytic reaction .

In addition, according to a preferred embodiment of the present invention, the catalyst is regenerated through the reaction of the sulfur oxide and the absorbent contained in the exhaust gas introduced into the rear reactor from the front reactor or through the exhaust gas conversion line from the rear reactor to the front reactor. .

Further, according to a preferred embodiment of the present invention, the reducing agent is ammonia or urea, the reducing agent supply line extending from the tank in which the reducing agent is stored is connected to the shear exhaust pipe, and the reducing agent supply amount is controlled by a valve installed in the reducing agent supply line.

In addition, according to a preferred embodiment of the present invention, the exhaust gas conversion line, the first induction pipe branched from the front end exhaust pipe extending to the rear reactor, and the second induction pipe for guiding the flow of exhaust gas from the rear reactor to the front end reactor And a third induction pipe extending from the front end reactor to the rear end exhaust pipe, and a branch is installed at the branch point of the first induction pipe branched from the front end pipe to control the flow direction so that the front end pipe flows to the front end reactor or the rear end reactor. .

As described above, the toxic substance continuous treatment system according to the present invention is applied to a calcium hydroxide or sodium hydroxide-based absorbent supplied to remove or reduce nitrogen oxides (NOx) and sulfur oxides (SOx), which are harmful substances contained in the exhaust gas. By installing a catalyst that can be regenerated inside the reactor, the catalyst can be regenerated simultaneously with the removal of sulfur oxides (SOx). As described above, the present invention is capable of regenerating the catalyst while removing nitrogen oxides (NOx) and sulfur oxides (SOx), which are harmful substances contained in the exhaust gas, so that the continuous flow of nitrogen oxides (NOx) and the change of the flow direction of the exhaust gases There is an advantage that the sulfur oxide (SOx) can be removed or reduced. Therefore, the problem of air pollution of ship can be solved drastically.

1 is a conceptual diagram showing a continuous treatment system for harmful substances of exhaust gas according to the present invention,
2 is a conceptual diagram showing the exhaust gas flow when the exhaust gas is introduced into the shear reactor,
3 is a conceptual diagram illustrating the exhaust gas flow when the exhaust gas is introduced into the rear stage reactor.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a continuous substance processing system according to the present invention will be described in detail.

In the drawings, Figure 1 is a conceptual diagram showing a continuous processing system for the harmful substances of the exhaust gas according to the present invention, Figure 2 is a conceptual diagram showing the exhaust gas flow when the exhaust gas is introduced into the shear reactor, Figure 3 is a exhaust gas It is a conceptual diagram which shows the exhaust gas flow in the case of pre-injection into a post reactor.

As shown in FIG. 1, the shear exhaust pipe 101F extending from the engine 100 extends into the reactors 210 and 220, and the exhaust gas treated in the reactors 210 and 220 is discharged from the reactors 210 and 220. It is exhausted to the atmosphere through the extended rear exhaust pipe 101B.

The reactors 210 and 220 are divided into a front end reactor 210 to which a front end exhaust pipe 101F is connected and a rear end reactor 220 to which a rear end exhaust pipe 101B is extended, and the exhaust gas introduced into the front end reactor 210 has its pressure. It flows into the rear reactor 220 by the difference.

On the other hand, the harmful continuous processing system is provided with an exhaust gas switching line for switching the flow direction of the exhaust gas.

The exhaust gas conversion line converts the flow direction of the exhaust gas so that the exhaust gas of the front end exhaust pipe 101F passes through the rear end reactor 220 first, flows into the front end reactor 210, and then exhausts into the atmosphere through the rear end exhaust pipe 101B. do.

In detail, the exhaust gas conversion line includes the first induction pipe 111 extending from the front end exhaust pipe 101F to the rear end reactor 220 and the rear end reactor 220 such that the exhaust gas in the rear end reactor 220 flows to the front end reactor 210. ) And a second induction pipe 112 connecting the front end reactor 210 and a third induction pipe 113 extending from the front end reactor 210 to the rear end exhaust pipe 101B. Therefore, the exhaust gas exhausted from the engine 100 passes through the rear stage reactor 220 through the exhaust gas conversion line and then exhausts to the atmosphere through the front stage reactor 210.

In addition, an absorbent line 300 capable of injecting calcium hydroxide or sodium hydroxide-based absorbent 301 into the front end reactor 210 and the rear end reactor 220 may include an upper part of the front end reactor 210 and an upper part of the rear end reactor 220. Are installed on each.

In addition, the catalyst 500 capable of removing nitrogen oxides (NOx) and sulfur oxides (SOx) and regenerating by the absorbent 301, sulfur dioxide (SO ₂ ) and the atmosphere inside the reactors 210 and 220 may include the shear reactor 210. And are respectively installed in the rear stage reactor 220, the front end exhaust pipe (101F) is connected to a reducing agent supply line 400 for supplying a reducing agent to the exhaust gas.

The following describes in detail the hazardous material continuous treatment system configured as described above.

1 and 2, in the hazardous material continuous treatment system, the shear exhaust pipe 101F extending from the engine 100 is connected to the shear reactor 210. The reducing agent supply line 400 is connected to the front end exhaust pipe 101F, and the reducing agent supply line 400 extending from the reducing agent tank 410 in which the reducing agent is stored as ammonia or urea is connected to the front end exhaust pipe 101F, and the reducing agent supply line The valve 400 is equipped with a valve 400V to control the supply amount of the reducing agent.

And the three-way side 110 is mounted on the shear exhaust pipe 101F, the three-way side 110 is installed between the point where the reducing agent supply line 400 is connected and the shear reactor 210. And the three-way side 110, the first induction pipe 111 is extended and the first induction pipe 111 is connected to the rear reactor 220.

Therefore, the exhaust gas is introduced into the front end reactor 210 or the rear end reactor 220 by the control of the three-way side 110.

When the exhaust gas flows into the front end reactor 210, as shown in FIG. 2, the exhaust gas flows from the front end reactor 210 to the rear end reactor 220 by a pressure difference, and is then connected to the rear end reactor 220. It is exhausted to the atmosphere through the rear end exhaust pipe (101B), in this case, in the rear end reactor 220, the absorbent 301 is injected into the rear end reactor 220 in the absorbent line 300 installed at the top.

And when the exhaust gas flows into the rear reactor 220, as shown in Figure 3, the exhaust gas from the rear reactor 220 to the front reactor 210 through the second induction pipe 112 by the pressure difference. And then flows from the front end reactor 210 through the third induction pipe 113 to the rear end exhaust pipe 101B to be exhausted into the atmosphere. In this case, the front end reactor 210 absorbs the absorbent in the absorbent line 300 installed thereon. Is injected into the rear stage reactor 220.

On the other hand, the second induction pipe (112) is equipped with a valve (112V) to open the exhaust gas flows from the rear reactor 220 to the front reactor 210, and when closed, the rear reactor 220 in the front reactor 210 when closed. ), The exhaust gas cannot flow. In addition, the absorbent line 300 extending to the front end reactor 210 or the rear end reactor 220 is equipped with a valve 300V, respectively, so that the absorbent 301 is selectively sheared reactor 210 or according to opening and closing of the valve 300V. It is fed to the rear reactor 220.

The following describes the relationship between the treatment of harmful substances in the front end reactor and the rear end reactor according to the flow direction of the exhaust gas.

When the exhaust gas flows into the shear reactor 210, the reducing agent supplied through the reducing agent supply line 400 is included in the exhaust gas and flows into the shear reactor 210.

Nitrogen oxide (NOx) of the exhaust gas is introduced into the front end reactor 210 with a reducing agent and then reduced through a catalytic reaction, and the unreduced nitrogen oxides (NOx) in the front end reactor 210 are exhausted together with the exhaust gas. After flowing into 220, it is reduced through a catalytic reaction in the rear reactor 220 to remove nitrogen oxides from the exhaust gas.

On the other hand, sulfur oxide (SOx) contained in the exhaust gas is removed by reacting with calcium hydroxide or sodium hydroxide which is an absorbent supplied from the rear reactor 220. In this case, sulfur dioxide and sodium hydroxide, which are absorbers, react with the catalyst to regenerate the catalyst.

As such, the nitrogen oxides (NOx) and sulfur oxides (SOx) included in the exhaust gas are removed while passing through the front end reactor 210 and the rear end reactor 220, and the exhaust gas from which noxious substances are removed is transferred to the rear end reactor 220. It is exhausted to the atmosphere through the connected rear end exhaust pipe 101B, during which the catalyst 500 of the rear end reactor 220 is regenerated.

As the process of treating nitrogen oxides (NOx) and sulfur oxides (SOx) proceeds, the catalyst 500 of the front end reactor 210 is reduced in function, and conversely, the catalyst 500 of the rear end reactor 220 is regenerated to function. This is improved, in order to compensate for this, the present invention switches the flow direction of the exhaust gas through the continuous treatment system for hazardous substances.

As shown in FIG. 3, the exhaust gas introduced into the first induction pipe 111 through the control of the three-way side 110 is introduced into the rear stage reactor 220 through the first induction pipe 111, and the second After the induction pipe 112 flows from the rear end reactor 220 to the front end reactor 210, the third induction pipe 113 flows from the front end reactor 210 to the rear end exhaust pipe 101B.

At this time, the absorbent 301 is injected into the shear reactor 210 through the absorbent line 300 installed on the upper portion of the shear reactor 210.

Nitrogen oxide (NOx) of the exhaust gas is introduced into the rear reactor 220 with a reducing agent and then reduced through a catalytic reaction, and the non-reduced nitrogen oxides (NOx) in the rear reactor 220 are combined with the exhaust gas in a shear reactor ( After being introduced into 210, the catalyst is reduced through a catalytic reaction in the shear reactor 210 to remove nitrogen oxides from the exhaust gas.

On the other hand, sulfur oxide (SOx) contained in the exhaust gas is removed by reacting with calcium hydroxide or sodium hydroxide which is an absorbent supplied from the shear reactor 210. In this case, the sulfur dioxide generated and the sodium hydroxide as the absorbent 301 react with the catalyst 500 to regenerate the catalyst 500.

As such, the nitrogen oxides (NOx) and sulfur oxides (SOx) included in the exhaust gas are removed while passing through the rear stage reactor 220 and the front end reactor 210, and the exhaust gas from which noxious substances are removed is transferred to the front end reactor 210. It is exhausted into the atmosphere through the connected third induction pipe 113 and the rear end exhaust pipe 101B, during which the catalyst 500 of the front end reactor 210 is regenerated.

As described above, in the present invention, either one of the front end reactor 210 and the rear end reactor 220 removes nitrogen oxides (NOx) and sulfur oxides (SOx) while the catalyst 500 is being regenerated, thereby changing the flow direction of the exhaust gas. Continuous conversion of hazardous substances is possible using the regenerated catalyst 500 while converting.

In the description of the continuous treatment system for harmful substances of exhaust gas according to an embodiment of the present invention, the reactor is classified into a front end and a rear end, but this is merely an exemplary description. It is not limited to the reactor alone, depending on the degree of regeneration of the catalyst to implement two or more reactors can be configured to reduce or remove the harmful substances in the exhaust gas along with the catalyst regeneration.

100: engine
101F, 101B: Exhaust Pipe
110: trilateral
111, 112, 113: induction pipe
210: shear reactor
220: after reactor
300: Absorbent Line
301: Absorbent
400: reducing agent supply line
410 tank
500: catalyst

Claims (6)

A first reactor connected to a shear exhaust pipe extending from the engine, and equipped with an absorbent line for reducing harmful substances in exhaust gas through a catalytic reaction and supplying an absorbent therein;
A second reactor having an absorber line for reducing harmful substances in the exhaust gas through a catalytic reaction and supplying an absorbent therein, and having a rear end exhaust pipe for exhausting exhaust gas into the atmosphere;
It includes an exhaust gas conversion line for changing the flow direction of the exhaust gas so that the exhaust gas of the front exhaust pipe flows into the second reactor and flows into the first reactor and then exhausted to the atmosphere through the rear exhaust pipe,
Exhaust gas from the front exhaust pipe is introduced into the first reactor and flows into the second reactor and then exhausted to the downstream exhaust pipe, or flows into the second reactor through the exhaust gas conversion line and flows into the first reactor, and then exhausted to the downstream exhaust pipe. A continuous treatment system for harmful substances of exhaust gas.
The method of claim 1,
The exhaust pipe is a continuous exhaust gas hazardous material continuous processing system, characterized in that the reducing agent supply line for supplying a reducing agent to the exhaust gas.
The method of claim 2,
Exhaust gas containing a reducing agent flows into the first reactor or into the second reactor through an exhaust gas conversion line, and then nitrogen oxides contained in the exhaust gas are reduced through a catalytic reaction. Continuous processing system.
The method of claim 3,
The catalyst is regenerated through the reaction of the sulfur oxide and the absorbent contained in the exhaust gas introduced from the first reactor to the second reactor or through the exhaust gas conversion line into the first reactor from the second reactor. Hazardous Substance Continuous Processing System.
The method according to any one of claims 2 to 4,
The reducing agent is ammonia or urea, and the reducing agent supply line extending from the tank in which the reducing agent is stored is connected to the front end exhaust pipe, and the reducing agent supply amount is controlled by a valve installed in the reducing agent supply line.
The method according to any one of claims 1 to 4,
Exhaust gas conversion line,
A first induction pipe branching from the front exhaust pipe to the second reactor, a second induction pipe guiding the flow of exhaust gas from the second reactor to the first reactor, and a third induction pipe extending from the first reactor to the downstream exhaust pipe Includes a tube,
A branching point of the first induction pipe branched from the front end exhaust pipe is equipped with a valve to control the flow direction to flow the front end exhaust pipe to the first reactor or the second reactor, continuous processing system for hazardous substances of exhaust gas.

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