KR20220076400A - Exhaust gas treatment apparatus - Google Patents

Abstract

Disclosed is an exhaust gas treatment device.
An exhaust gas treatment apparatus according to an embodiment of the present invention includes: a carbon dioxide absorption unit for absorbing carbon dioxide using an absorption medium from exhaust gas discharged from the exhaust gas exhaust device; and a carbon dioxide separation unit for separating carbon dioxide from the absorption medium absorbing carbon dioxide; Including, carbon dioxide separated from the absorption medium and discharged from the carbon dioxide separation unit may be supplied to an intake part of an engine, which is one of the exhaust gas exhaust devices, or supplied to a place of use.

Description

Exhaust gas treatment system {EXHAUST GAS TREATMENT APPARATUS}

The present invention relates to an exhaust gas treatment apparatus for treating exhaust gas.

Since regulations on exhaust gas emitted from ships are becoming more and more strengthened, and the problem of global warming is getting more serious, the need to remove carbon dioxide from exhaust gas emitted from ships has emerged.

Accordingly, the ship is equipped with an exhaust gas treatment device capable of removing carbon dioxide from the exhaust gas, and in such an exhaust gas treatment device, an absorption medium capable of absorbing carbon dioxide from the exhaust gas is used to remove carbon dioxide from the exhaust gas. can

The absorption medium absorbing carbon dioxide can be reused to remove carbon dioxide from the exhaust gas by separating the carbon dioxide, and since the carbon dioxide removed from the absorption medium cannot be discharged into the air, it must be treated appropriately. .

The present invention has been made in recognition of at least one of the needs or problems occurring in the prior art as described above.

One aspect of the object of the present invention is to separate carbon dioxide from an absorption medium that has absorbed carbon dioxide in exhaust gas discharged from an exhaust gas exhaust device such as an engine or a boiler, and to separate the carbon dioxide from the absorption medium in the separation unit in the exhaust gas exhaust device. It is to be supplied to the intake part of the engine, which is one, or to be supplied to the place of use.

Another aspect of the present invention is to supply high-purity carbon dioxide to a place of use by concentrating carbon dioxide while circulating in the engine, the carbon dioxide absorption unit and the carbon dioxide separation unit of the exhaust gas treatment device.

Another aspect of the object of the present invention is to reduce the nitrogen oxide contained in the exhaust gas discharged from the engine.

An exhaust gas treatment apparatus related to an embodiment for realizing at least one of the above problems may include the following features.

An exhaust gas treatment apparatus according to an embodiment of the present invention includes: a carbon dioxide absorption unit for absorbing carbon dioxide using an absorption medium from exhaust gas discharged from the exhaust gas exhaust device; and a carbon dioxide separation unit for separating carbon dioxide from the absorption medium absorbing carbon dioxide; Including, carbon dioxide separated from the absorption medium and discharged from the carbon dioxide separation unit may be supplied to an intake part of an engine, which is one of the exhaust gas exhaust devices, or supplied to a place of use.

In this case, when carbon dioxide is concentrated to a predetermined concentration or more while circulating carbon dioxide in the engine, the carbon dioxide absorption unit, and the carbon dioxide separation unit, the carbon dioxide can be supplied to a place of use.

In addition, one side is connected to the carbon dioxide separation unit and the other side of the carbon dioxide supply pipe through which the carbon dioxide separated from the absorption medium flows is branched and connected to the intake part and the place of use, respectively, and a flow path switching valve is provided at the part where the carbon dioxide supply pipe is branched Thus, carbon dioxide may be supplied to the intake unit or the place of use.

The absorption medium is an absorption liquid injected into the exhaust gas from the carbon dioxide absorption unit, and the carbon dioxide separation unit separates carbon dioxide from a waste absorption liquid, which is an absorption liquid that absorbs carbon dioxide from the exhaust gas, to regenerate the waste absorption liquid as an absorption liquid.

In addition, the carbon dioxide separation unit includes a gas-liquid separation membrane through which a gas passes but not a liquid, and the gas-liquid separation membrane divides a liquid flow path through which a liquid flows and a gas flow path through which a gas flows, and a waste absorption liquid flows through the liquid flow. As the carbon dioxide of the waste absorption liquid passes through the gas-liquid separation membrane while flowing through the furnace, the waste absorption liquid may be separated into carbon dioxide and the absorption liquid by moving to the gas flow passage in which a low carbon dioxide partial pressure is formed.

In addition, the gas-liquid separation membrane may be a hollow fiber membrane in which the liquid flow path or the gas flow path is formed.

In addition, a waste absorption liquid drain pipe connected to the carbon dioxide absorption unit may be connected to one side of the liquid flow path.

In addition, one side of a carbon dioxide supply pipe having a vacuum pump is connected to one side of the gas flow path to form a low partial pressure of carbon dioxide in the gas flow path.

In addition, an air inlet pipe having a flow rate control valve is connected to the other side of the gas flow path, so that the partial pressure of carbon dioxide formed in the gas flow path can be adjusted.

In addition, the carbon dioxide absorption unit may include a housing connected to the exhaust gas exhaust device, and an absorption liquid injection unit that injects an absorption liquid into the exhaust gas flowing through the housing.

In addition, the absorbent liquid injection unit is connected to the absorption liquid supply tank and passes through one surface of the housing to include an absorption liquid flow pipe provided inside the housing, and an absorption liquid injection nozzle provided in a portion of the absorption liquid flow tube provided inside the housing. can

In addition, the carbon dioxide separation unit may be connected to the absorption liquid supply tank by an absorption liquid recovery pipe so that the absorption liquid regenerated in the carbon dioxide separation unit is supplied to the absorption liquid supply tank.

In addition, the absorption liquid may be seawater or an aqueous alkali solution.

As described above, according to an embodiment of the present invention, carbon dioxide is separated from an absorption medium that has absorbed carbon dioxide of exhaust gas discharged from an exhaust gas exhaust device such as an engine or a boiler, and the separation unit exhausts the carbon dioxide separated from the absorption medium. It can be supplied to the intake part of the engine, which is one of the gas exhaust devices, or to be supplied to the place of use.

In addition, according to an embodiment of the present invention, carbon dioxide is concentrated while circulating in the engine, the carbon dioxide absorption unit and the carbon dioxide separation unit of the exhaust gas treatment device, so that high-purity carbon dioxide can be supplied to a place of use.

And also, according to an embodiment of the present invention, nitrogen oxides contained in the exhaust gas discharged from the engine can be reduced.

1 is a view showing an embodiment of an exhaust gas treatment apparatus according to the present invention.
2 is a view showing an embodiment of a carbon dioxide absorption unit of an embodiment of the exhaust gas treatment apparatus according to the present invention.
3 is a view showing another embodiment of the carbon dioxide separation unit of one embodiment of the exhaust gas treatment apparatus according to the present invention.

In order to help understanding of the features of the present invention as described above, an exhaust gas treatment apparatus related to an embodiment of the present invention will be described in more detail below.

The embodiments described below will be described based on the most suitable embodiments for understanding the technical features of the present invention, and the technical features of the present invention are not limited by the described embodiments, but Examples are to illustrate that the present invention can be implemented. Accordingly, the present invention is capable of various modifications within the technical scope of the present invention through the embodiments described below, and these modified embodiments will fall within the technical scope of the present invention. In addition, in the reference numerals in the accompanying drawings to help the understanding of the embodiments to be described below, related elements among the elements that perform the same operation in each embodiment are indicated by the same or extended numbers.

Hereinafter, an exhaust gas treatment apparatus according to the present invention will be described with reference to FIGS. 1 to 3 .

1 is a view showing an embodiment of an exhaust gas treatment apparatus according to the present invention, FIG. 2 is a view showing an embodiment of a carbon dioxide absorption unit of an embodiment of the exhaust gas treatment apparatus according to the present invention, and FIG. It is a view showing another embodiment of the carbon dioxide separation unit of one embodiment of the exhaust gas treatment apparatus according to the present invention.

An embodiment of the exhaust gas treatment apparatus according to the present invention may include a carbon dioxide absorption unit 200 and a carbon dioxide separation unit 300 .

The carbon dioxide absorption unit 200 may absorb carbon dioxide using an absorption medium from exhaust gas discharged from an exhaust gas exhaust device ED such as an engine EG or a boiler BL as shown in FIG. 1 .

To this end, the carbon dioxide absorption unit 200 may be connected to an exhaust gas exhaust device ED such as an engine EG or a boiler BL by an exhaust pipe LE as shown in FIG. 1 . In addition, the exhaust gas discharged from the exhaust gas exhaust device ED such as the engine EG or the boiler BL may flow through the exhaust pipe LE to be introduced into the carbon dioxide absorption unit 200 . When exhaust gas flows into the carbon dioxide absorption unit 200 , the absorption medium may absorb carbon dioxide from the exhaust gas in the carbon dioxide absorption unit 200 . Accordingly, the exhaust gas may be discharged from the carbon dioxide absorption unit 200 in a state in which carbon dioxide is removed.

The absorption medium for absorbing carbon dioxide from the exhaust gas in the carbon dioxide absorption unit 200 may be, for example, an absorption liquid injected into the exhaust gas from the carbon dioxide absorption unit 200 . have. However, the absorption medium for absorbing carbon dioxide from the exhaust gas in the carbon dioxide absorption unit 200 is not particularly limited, and any known absorption medium capable of absorbing carbon dioxide from the exhaust gas may be used.

When the absorption medium is an absorption liquid injected from the carbon dioxide absorption unit 200 to the exhaust gas, the carbon dioxide absorption unit 200 may include a housing 210 and an absorption liquid injection unit 220 as shown in FIG. 2 . .

The housing 210 may be connected to an exhaust gas exhaust device ED such as an engine EG or a boiler BL. For example, the housing 210 may be connected to an exhaust gas exhaust device ED such as an engine EG or a boiler BL by an exhaust pipe LE as shown in FIGS. 1 and 2 . Accordingly, the exhaust gas discharged from the exhaust gas exhaust device ED, such as the engine EG or the boiler BL, flows through the exhaust pipe LE and may be introduced into the housing 210 as shown in FIG. 2 . .

As shown in FIG. 2 , the housing 210 may include an inlet 211 , an outlet 212 , and a drain 213 . The inlet 211 may be provided on the lower side of the housing 210 , the outlet 212 may be provided on the upper surface of the housing 210 , and the drain hole 213 may be provided on the lower surface of the housing 210 . However, the portion of the housing 210 provided with the inlet 211 , the outlet 212 , or the drain 213 is not particularly limited.

The inlet 211 may be connected to an exhaust gas exhaust device ED such as the engine EG or the boiler BL by an exhaust pipe LE. Accordingly, the exhaust gas discharged from the exhaust gas exhaust device ED and flowed through the exhaust pipe LE flows into the housing 210 through the inlet 211 as shown in FIG. can move On the other hand, in the case of the engine EG among the exhaust gas exhaust device ED, the inlet 211 is connected to the exhaust part OT of the engine EG by the exhaust pipe LE as shown in FIGS. 1 and 2 . can be connected In addition, the exhaust gas discharged from the exhaust unit OT of the engine EG may flow through the exhaust pipe LE and may be introduced into the housing 210 through the inlet 211 of the housing 210 .

As shown in FIG. 2 , the absorbent liquid may be sprayed into the housing 210 by the absorbent liquid spraying unit 220 . Accordingly, the exhaust gas flowing into the housing 210 may be in contact with the absorption liquid. As such, when the exhaust gas comes into contact with the absorption liquid, carbon dioxide contained in the exhaust gas may be absorbed by the absorption liquid and removed from the exhaust gas. The exhaust gas from which carbon dioxide has been removed may be discharged through the outlet 212 . In addition, the waste absorption liquid, which is the absorption liquid absorbing carbon dioxide, may be drained through the drain hole 213 .

As shown in FIG. 2 , a packing 230 may be provided inside the housing 210 . The contact area and contact time between the exhaust gas and the absorption liquid may be increased by the packing 230 . Thereby, the treatment efficiency of the exhaust gas by the absorption liquid can be improved. The packing 230 may include a plurality of members having a plurality of holes formed therein. In the housing 210 , in addition to the packing 230 , a configuration that can increase the contact area and contact time between the exhaust gas and the absorbent liquid, such as the packing 230 , may be provided.

The absorption liquid injection unit 220 may inject the absorption liquid into the exhaust gas flowing through the housing 210 . As shown in FIG. 2 , the absorbent liquid spray unit 220 may include an absorbent liquid flow pipe 221 and an absorbent liquid spray nozzle 222 .

The absorbent liquid flow pipe 221 may be connected to the absorbent liquid supply tank 400 . The absorbent liquid flow pipe 221 may be connected to the absorbent liquid supply tank 400 by an absorbent liquid supply pipe LP as shown in FIG. 2 . The absorption liquid supply pipe LP may be provided with an absorption liquid supply pump PP. And, when the absorbent liquid supply pump PP is driven, the absorbent liquid stored in the absorbent liquid supply tank 400 may flow through the absorbent liquid flow pipe 221 .

The absorbent liquid flow pipe 221 may pass through one surface of the housing 210 and be provided inside the housing 210 . In addition, the absorbent liquid injection nozzle 222 may be provided in a portion of the absorbent liquid flow pipe 221 provided in the housing 210 . Accordingly, the absorbent liquid flowing through the absorbent liquid flow pipe 221 may be sprayed into the exhaust gas flowing through the housing 210 through the absorbent liquid injection nozzle 222 as shown in FIG. 2 .

Meanwhile, the absorption liquid supply tank 400 may supply the absorption liquid to the carbon dioxide absorption unit 200 . An absorbent liquid may be stored in the absorbent liquid supply tank 400 . The absorption liquid stored in the absorption liquid supply tank 400 may be, for example, seawater or an alkaline aqueous solution such as an aqueous sodium hydroxide solution. However, the absorption liquid stored in the absorption liquid supply tank 400 is not particularly limited, and it is injected into the exhaust gas to absorb the carbon dioxide contained in the exhaust gas by contacting the exhaust gas, and the carbon dioxide is separated and regenerated in the carbon dioxide separation unit 300 . As long as it can be done, anything well known is possible.

As shown in FIG. 2 , one side of the absorbent liquid supply pipe LP may be connected to the absorbent liquid supply tank 400 . The other side of the absorbent liquid supply pipe LP may be connected to the absorbent liquid flow pipe 221 of the absorbent liquid spray unit 220 . In addition, when the absorption liquid supply pump PP provided in the absorption liquid supply pipe LP is driven, the absorption liquid in the absorption liquid supply tank 400 may be supplied to the absorption liquid injection unit 220 through the absorption liquid supply pipe LP.

One side of the absorption liquid recovery pipe LR may be connected to the absorption liquid supply tank 400 . The other side of the absorption liquid recovery pipe LR may be connected to the carbon dioxide separation unit 300 . In addition, the absorbent liquid regenerated in the carbon dioxide separation unit 300 may be supplied to and stored in the absorbent liquid supply tank 400 through the absorbent liquid recovery pipe LR as shown in FIGS. 1 and 2 .

Meanwhile, as shown in FIG. 2 , the absorbent supply tank 500 may be connected to the absorbent liquid recovery pipe LR by the absorbent supply pipe LT. Accordingly, the absorbent stored in the absorbent supply tank 500, for example, an alkali agent such as sodium hydroxide, may be supplied to the regenerated absorbent liquid flowing through the absorbent recovery pipe LR through the absorbent supply pipe LT. In addition, although not shown, the absorbent supply pipe LT may be connected to the absorbent liquid supply tank 400 to supply the absorbent stored in the absorbent supply tank 500 to the absorbent liquid stored in the absorbent liquid supply tank 400 .

As shown in FIG. 2 , a heat exchanger HE may be connected to the absorption liquid supply tank 400 . The heat exchanger HE exchanges heat with the absorbent liquid stored in the absorbent liquid supply tank 400 to cool the absorbent liquid to a temperature at which carbon dioxide contained in the exhaust gas can be relatively well absorbed. The absorbent liquid absorbs carbon dioxide contained in the exhaust gas in the carbon dioxide absorption unit 200 to become a waste absorbent liquid, and the temperature may be increased by the hot exhaust gas. In this way, when the waste absorption liquid having a higher temperature than the absorption liquid before being injected into the carbon dioxide absorption unit 200 is regenerated in the carbon dioxide separation unit 300, the regenerated absorption liquid also has a temperature higher than that of the absorption liquid before being injected into the carbon dioxide absorption unit 200. can be raised As such, when the absorption liquid having a higher temperature than the absorption liquid before being sprayed to the carbon dioxide absorption unit 200 is supplied to the absorption liquid supply tank 400 , the temperature of the absorption liquid stored in the absorption liquid supply tank 400 increases, and the carbon dioxide absorption rate of the absorption liquid decreases. can be However, as described above, when the temperature of the absorbent liquid stored in the absorbent liquid supply tank 400 is cooled to a temperature at which carbon dioxide contained in the exhaust gas can be relatively well absorbed by the heat exchanger (HE), the carbon dioxide absorption rate of the absorbent liquid does not decrease. may not be

The configuration of the carbon dioxide absorption unit 200 is not limited to the above, and can absorb carbon dioxide using an absorption medium from the exhaust gas discharged from the exhaust gas exhaust device (ED) such as the engine (EG) or the boiler (BL). Any well-known configuration is possible as long as there is a configuration therein.

The carbon dioxide separation unit 300 may separate carbon dioxide from the absorption medium that has absorbed the carbon dioxide.

When the absorption medium is an absorption liquid injected into the exhaust gas from the carbon dioxide absorption unit 200 as described above, the carbon dioxide separation unit 300 is a waste absorption liquid drained from the carbon dioxide absorption unit 200 , that is, from the carbon dioxide absorption unit 200 . By separating carbon dioxide from waste absorption liquid, which is an absorption liquid that has absorbed carbon dioxide from exhaust gas, the waste absorption liquid can be regenerated as an absorption liquid.

1 and 2, one side of the waste absorption liquid drain pipe LD is connected to the carbon dioxide absorption unit 200, for example, the drain 213 of the housing 210 of the carbon dioxide absorption unit 200, and the waste absorption liquid drain pipe The other end of the LD may be connected to the carbon dioxide separation unit 300 . Accordingly, the waste absorption liquid drained through the drain hole 213 of the carbon dioxide absorption unit 200, for example, the housing 210 of the carbon dioxide absorption unit 200 flows to the carbon dioxide separation unit 300 through the waste absorption liquid drain pipe LD. can do. In this case, the waste absorption liquid drain pipe (LD) is provided with a booster pump (PB) as shown in FIG. 1, so that the waste absorption liquid is smoothly transferred from the carbon dioxide absorption unit 200 through the waste absorption liquid drain pipe (LD) from the carbon dioxide separation unit ( 300) to flow.

As shown in FIG. 1 , the waste absorbent drain pipe LD may be provided with a filtration treatment unit WTS for filtering and treating contaminants other than gas components such as carbon dioxide contained in the waste absorbent liquid. The waste absorption liquid may contain contaminants such as particulate matter or oil in addition to gas components such as carbon dioxide. In addition, the filtration unit WTS may filter pollutants other than gas components such as carbon dioxide included in the waste absorbent liquid flowing to the carbon dioxide separation unit 300 through the waste absorbent liquid drain pipe LD. Accordingly, since contaminants such as particulate matter or oil, for example, contained in the waste absorption liquid are filtered by the filtration unit (WTS), carbon dioxide is separated in the carbon dioxide separation unit 300 and contained in the regenerated absorption liquid, for example, Contaminants such as particulate matter or oil can be minimized. Accordingly, the performance of the gas-liquid separation membrane 320 to be described later included in the carbon dioxide separation unit 300 can be prevented from being lowered by, for example, contaminants such as particulate matter or oil. The filtration unit WTS can filter, for example, particulate matter and contaminants such as oil from the waste absorption liquid using, for example, a filter (not shown) or centrifugal force. However, the configuration in which the filtration unit WTS filters contaminants such as particulate matter and oil from the waste absorption liquid is not particularly limited, and any known configuration is possible.

As shown in FIG. 1 , one side of the absorption liquid recovery pipe LR may be connected to the carbon dioxide separation unit 300 , and the other side of the absorption liquid recovery pipe LR may be connected to the absorption liquid supply tank 400 . Accordingly, the absorbent liquid from which carbon dioxide is separated and regenerated in the carbon dioxide separation unit 300 may be supplied to the absorbent liquid supply tank 400 through the absorbent liquid recovery pipe LR to be reused as an absorbent liquid.

The carbon dioxide separation unit 300 includes a gas-liquid separation membrane 320 through which a gas passes but not a liquid, and the gas-liquid separation membrane 320 includes a liquid flow path 311 through which a liquid, for example, a waste absorption liquid flows, and a gas, such as A gas flow path 312 through which carbon dioxide flows may be partitioned. Accordingly, in the present invention, carbon dioxide can pass through the gas-liquid separation membrane 320 , but the waste absorption liquid cannot pass through the gas-liquid separation membrane 320 .

In addition, a low partial pressure of carbon dioxide may be formed in the gas flow path 312 . Accordingly, as the waste absorption liquid flows through the liquid flow passage 311, the carbon dioxide of the waste absorption liquid passes through the gas-liquid separation membrane 320 and moves to the gas flow passage 312 in which a low carbon dioxide partial pressure is formed, so that the waste absorption liquid is converted into carbon dioxide and absorption liquid. can be separated. The low carbon dioxide partial pressure means a state in which the concentration of carbon dioxide is low. In the gas flow path 312 , the carbon dioxide concentration is low, and a low carbon dioxide partial pressure is formed. The lower the partial pressure, the lower the solubility of the gas in the liquid. Accordingly, as the waste absorption liquid flows through the liquid flow path 311 , the carbon dioxide of the waste absorption liquid comes out of the waste absorption liquid, passes through the gas-liquid separation membrane 320 , and moves to the gas flow path 312 in which a low carbon dioxide partial pressure is formed. In order to form a low partial pressure of carbon dioxide in the gas flow path 312 , a negative pressure may be applied to the gas flow path 312 , or carbon dioxide may be diluted in the gas flow path 312 with a sweep gas such as air. As described above, as the waste absorption liquid flows through the liquid flow path 311 , the carbon dioxide of the waste absorption liquid passes through the gas-liquid separation membrane 320 and moves to the gas flow path 312 in which a low carbon dioxide partial pressure is formed, which facilitates the removal of carbon dioxide from the waste absorption liquid can be separable.

By using a gas-liquid separation membrane 320 that passes gas but not liquid, and forming a low partial pressure of carbon dioxide in the gas flow path 312 partitioned by the gas-liquid separation membrane 320, carbon dioxide is separated from the waste absorption liquid, Carbon dioxide can be regenerated into an absorbent liquid that has not been absorbed. In the case of using such a method, since the amount of the absorbent to be supplied to the regenerated absorbent liquid can be reduced, the cost required to regenerate the waste absorbent liquid can be reduced. Accordingly, the cost required for treating the exhaust gas can be reduced. And, since the size of the carbon dioxide separation unit 300 can be made relatively small, the size of the exhaust gas treatment apparatus 100 can be reduced, for example, where there is a limitation in the installation space, such as a ship, the exhaust gas treatment apparatus 100 ) can be easily installed.

The carbon dioxide separation unit 300 may be configured to include a separation unit body 310 as shown in FIG. 1 . The inside of the separation unit body 310 may be divided into a liquid flow path 311 and a gas flow path 312 by a gas-liquid separation membrane 320 .

1 and 2, the carbon dioxide absorption unit 200, for example, the waste absorption liquid drain pipe LD connected to the drain port 213 of the housing 210 of the carbon dioxide absorption unit 200 is connected to a liquid flow path 311. It is connected to one side of the liquid flow path 311, the other side may be connected to the absorption liquid supply tank 400 by the absorption liquid recovery pipe (LR). Accordingly, the waste absorption liquid drained through the drain hole 213 of the carbon dioxide absorption unit 200, for example, the housing 210 of the carbon dioxide absorption unit 200, flows into the liquid flow path 311 to close the liquid flow path 311. can move In addition, the absorbent liquid from which carbon dioxide is separated and regenerated while flowing through the liquid flow path 311 may be introduced into the absorbent liquid recovery pipe LR and may flow to the absorbent liquid supply tank 400 through the absorbent liquid recovery pipe LR.

As shown in FIG. 1 on one side of the gas flow path 312, one side of the carbon dioxide supply pipe LC provided with a vacuum pump PV may be connected. Accordingly, when the vacuum pump PV is driven, a low partial pressure of carbon dioxide may be formed in the gas flow path 312 . In addition, an air inlet pipe LA having a flow rate control valve VC may be connected to the other side of the gas flow path 312 . Thereby, in a state in which the vacuum pump PV is driven, the flow rate control valve VC is operated to control the flow rate of air flowing into the air inlet pipe LA, thereby forming the low flow rate formed in the gas flow path 312 . The partial pressure of carbon dioxide can be adjusted.

The gas-liquid separation membrane 320 may be a hollow fiber membrane in which a liquid flow path 311 is formed as shown in FIG. 1 . Accordingly, the internal space of the separation unit body 310 other than the gas-liquid separation membrane 320 may become the gas flow path 312 . In addition, the gas-liquid separation membrane 320 may be a hollow fiber membrane in which a gas flow path 312 is formed, as shown in FIG. 3 . In this case, the internal space of the separation unit body 310 other than the gas-liquid separation membrane 320 may be the liquid flow path 311 . However, the gas-liquid separation membrane 320 is not particularly limited, and a gas such as carbon dioxide passes but does not pass a liquid such as a waste absorption liquid, and a liquid flow path through which a liquid such as a waste absorption liquid flows through the separation unit body 310 ( 311) and the gas flow path 312 through which a gas such as carbon dioxide flows, any known type such as a flat membrane may be used.

On the other hand, in one embodiment of the exhaust gas treatment apparatus 100 according to the present invention, carbon dioxide separated from the absorption medium and discharged from the carbon dioxide separation unit 300 is the engine EG which is one of the exhaust gas emission devices ED. It may be supplied to the intake unit IT or may be supplied to a place of use (not shown).

The place of use is, for example, a storage tank (not shown) of a carbon dioxide carrier (not shown) or a device (not shown) for producing hydrogen through methane and carbon dioxide reforming (Carbon Dioxide Reforming, CH4 + CO2 → 2CO + 2H2) ), or a seabed stratum (not shown). However, the place of use is not particularly limited, and any place using carbon dioxide is possible.

When the carbon dioxide separated from the absorption medium in the carbon dioxide separation unit 300 is supplied to the intake part IT of the engine EG, which is one of the exhaust gas exhaust devices ED, the engine EG and the carbon dioxide absorption unit 200 and The carbon dioxide separation unit 300 may be concentrated while circulating carbon dioxide.

Accordingly, the carbon dioxide ratio of the air supplied to the intake part IT of the engine EG may be increased, and thus the nitrogen ratio of the air supplied to the intake part IT of the engine EG may be decreased. Accordingly, NOx included in the exhaust gas discharged from the engine EG, that is, nitrogen oxide may be reduced.

In addition, when the engine (EG), the carbon dioxide absorption unit 200, and the carbon dioxide separation unit 300 are concentrated to a predetermined concentration or more while the carbon dioxide is circulated, carbon dioxide is supplied to the place of use, thereby supplying higher purity carbon dioxide to the place of use. have.

To this end, as shown in FIG. 1, one side is connected to the gas flow path 312 of the carbon dioxide separation unit 300, for example, the carbon dioxide separation unit 300, and the carbon dioxide supply pipe (LC) through which the carbon dioxide separated from the absorption medium flows. The other end of the is branched and may be respectively connected to the intake part IT of the engine EG and a place of use. In addition, a flow path switching valve (VS) may be provided at a portion where the carbon dioxide supply pipe (LC) is branched. In addition, by manipulating the flow path switching valve VS, the carbon dioxide separated from the absorption medium may be supplied to the intake unit IT of the engine EG or may be supplied to a place of use. In this case, the concentration of carbon dioxide flowing through the carbon dioxide supply pipe LC after operating the flow path switching valve VS so that the carbon dioxide flowing through the carbon dioxide supply pipe LC is supplied to the intake part IT of the engine EG Only when is a predetermined concentration or more, the flow path switching valve VS may be operated so that the carbon dioxide flowing through the carbon dioxide supply pipe LC may be supplied to a place of use. And, although not shown for this purpose, a concentration sensor capable of measuring the concentration of carbon dioxide is provided in the carbon dioxide supply pipe LC to measure the concentration of carbon dioxide flowing through the carbon dioxide supply pipe LC.

As described above, when the exhaust gas treatment apparatus according to the present invention is used, the carbon dioxide is separated from the absorption medium that has absorbed the carbon dioxide of the exhaust gas discharged from the exhaust gas discharge device such as an engine or boiler, and the separation unit separates the carbon dioxide from the absorption medium. The carbon dioxide can be supplied to the intake part of the engine, which is one of the exhaust gas emission devices, or to be supplied to the place of use, and the engine, the carbon dioxide absorption unit and the carbon dioxide separation unit of the exhaust gas treatment device are concentrated while circulating the carbon dioxide, so that the purity is improved. High carbon dioxide can be supplied to the place of use, and nitrogen oxides contained in exhaust gas can be reduced.

In the exhaust gas treatment apparatus described above, the configuration of the above-described embodiment is not limitedly applicable, but all or part of each embodiment may be selectively combined so that various modifications may be made. have.

100: exhaust gas treatment device 200: carbon dioxide absorption unit
210: housing 211: inlet
212: outlet 213: drain
220: absorbent liquid injection unit 221: absorbent liquid flow pipe
222: absorption liquid injection nozzle 230: packing
300: carbon dioxide separation unit 310: separation unit body
311: liquid flow path 312: gas flow path 320: gas-liquid separation membrane 400: absorption liquid supply tank
500: absorbent supply tank ED: exhaust gas exhaust device
EG : Engine IT : Intake
OT: exhaust BL : Boiler
LE : Exhaust pipe LD : Waste absorption liquid drain pipe
LR : Absorbent recovery pipe LC : Carbon dioxide supply pipe
LA: Air inlet pipe LP: Absorbent liquid supply pipe
LT : Absorbent supply pipe PV : Vacuum pump
PB : Booster pump PP : Absorbent liquid supply pump
VC : Flow control valve VS : Flow changeover valve
WTS : Filtration treatment unit HE : Heat exchanger

Claims (5)

a carbon dioxide absorption unit for absorbing carbon dioxide using an absorption medium from the exhaust gas discharged from the exhaust gas exhaust device; and
a carbon dioxide separation unit for separating carbon dioxide from an absorption medium absorbing carbon dioxide; includes,
An exhaust gas treatment apparatus for separating carbon dioxide from an absorption medium and discharged from the carbon dioxide separation unit to be supplied to an intake part of an engine, which is one of the exhaust gas exhaust devices, or to a place of use. According to claim 1,
When carbon dioxide is concentrated to a predetermined concentration or higher while circulating in the engine, the carbon dioxide absorption unit, and the carbon dioxide separation unit, the exhaust gas treatment apparatus supplies carbon dioxide to a place of use. According to claim 1,
One side is connected to the carbon dioxide separation unit and the other side of the carbon dioxide supply pipe through which the carbon dioxide separated from the absorption medium flows is branched and connected to the intake part and the place of use, respectively,
A flow path switching valve is provided at a portion where the carbon dioxide supply pipe is branched so that carbon dioxide is supplied to the intake unit or a place of use. According to claim 1,
The absorption medium is an absorption liquid injected into the exhaust gas from the carbon dioxide absorption unit,
The carbon dioxide separation unit separates carbon dioxide from a waste absorbent liquid, which is an absorbent liquid that has absorbed carbon dioxide from the exhaust gas, and regenerates the waste absorbent liquid as an absorbent liquid. 5. The method of claim 4,
The carbon dioxide separation unit includes a gas-liquid separation membrane through which a gas passes but not a liquid, and the gas-liquid separation membrane divides a liquid flow path through which a liquid flows and a gas flow path through which a gas flows,
An exhaust gas treatment apparatus in which waste absorption liquid is separated into carbon dioxide and absorbent liquid as the waste absorption liquid flows through the liquid flow path and carbon dioxide of the waste absorption liquid passes through the gas-liquid separation membrane and moves to the gas flow path in which a low carbon dioxide partial pressure is formed.

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