KR20230044860A - Methane oxidation catalyst regeneration device and regeneration method - Google Patents

Methane oxidation catalyst regeneration device and regeneration method Download PDF

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KR20230044860A
KR20230044860A KR1020210127490A KR20210127490A KR20230044860A KR 20230044860 A KR20230044860 A KR 20230044860A KR 1020210127490 A KR1020210127490 A KR 1020210127490A KR 20210127490 A KR20210127490 A KR 20210127490A KR 20230044860 A KR20230044860 A KR 20230044860A
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oxidation catalyst
reactor
methane oxidation
regeneration gas
regeneration
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KR1020210127490A
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Korean (ko)
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이정주
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현대중공업 주식회사
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066Selective catalytic reduction [SCR]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00Regeneration or reactivation of catalysts, in general
    • B01J38/04Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106Auxiliary oxidation catalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/03Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/04Adding substances to exhaust gases the substance being hydrogen

Abstract

본 발명은 메탄을 산화시키는 메탄산화촉매의 재생장치 및 그 방법에 관한 것으로서, 특히 메탄산화촉매가 장착된 반응기를 폐쇄한 상태에서 재생가스를 반응기에 주입하여 메탄산화촉매에 형성된 PdO를 환원시킴으로써, 메탄산화촉매를 재생하는 장치 및 재생방법에 관한 것이다.
상기와 같은 목적을 달성하기 위한 본 발명에 따른 메탄산화촉매 재생장치는 메탄산화촉매가 장착된 반응기와, 메탄산화촉매에 형성된 PdO를 환원시키는 재생가스가 고압으로 수용된 재생가스 실린더와, 재생가스 실린더의 재생가스를 반응기 내부로 주입할 수 있도록 반응기에 재생가스 실린더를 탈장착 가능하도록 반응기에 설치된 포트를 포함하며, 재생방법은 메탄산화촉매가 장착된 반응기를 폐쇄하는 단계와, 폐쇄된 반응기의 내부로 재생가스를 주입하여 PdO를 환원하는 단계를 포함하는 것을 기술적 특징으로 한다.
The present invention relates to an apparatus and method for regenerating a methane oxidation catalyst that oxidizes methane, and in particular, in a state where the reactor equipped with the methane oxidation catalyst is closed, regeneration gas is injected into the reactor to reduce PdO formed in the methane oxidation catalyst, It relates to a device and method for regenerating a methane oxidation catalyst.
In order to achieve the above object, the methane oxidation catalyst regeneration apparatus according to the present invention includes a reactor equipped with a methane oxidation catalyst, a regeneration gas cylinder in which regeneration gas for reducing PdO formed in the methane oxidation catalyst is accommodated at high pressure, and a regeneration gas cylinder and a port installed in the reactor so that a regeneration gas cylinder can be detached from the reactor so that the regeneration gas can be injected into the reactor, and the regeneration method includes the steps of closing the reactor equipped with the methane oxidation catalyst, and It is technically characterized by including the step of reducing PdO by injecting a regeneration gas.

Description

메탄산화촉매 재생장치 및 재생방법{Methane oxidation catalyst regeneration device and regeneration method}Methane oxidation catalyst regeneration device and regeneration method

본 발명은 메탄을 산화시키는 메탄산화촉매의 재생장치 및 그 방법에 관한 것으로서, 특히 메탄산화촉매가 장착된 반응기를 폐쇄한 상태에서 재생가스를 반응기에 주입하여 메탄산화촉매에 형성된 PdO를 환원시킴으로써, 메탄산화촉매를 재생하는 장치 및 재생방법에 관한 것이다.The present invention relates to an apparatus and method for regenerating a methane oxidation catalyst that oxidizes methane, and in particular, in a state where the reactor equipped with the methane oxidation catalyst is closed, regeneration gas is injected into the reactor to reduce PdO formed in the methane oxidation catalyst, It relates to a device and method for regenerating a methane oxidation catalyst.

천연가스 연료는 기존 연료에 비하여 황산화물, 질소산화물, 미립자물질(PM: Particulate Matter) 등 대기오염물질의 배출량이 매우 적어 친환경 연료로 주목 받고 있다. 이런 장점 때문에 선박 및 자동차 등에 있어서 천연가스를 연료로 하는 엔진의 사용이 증가하는 추세이다.Compared to conventional fuels, natural gas fuel is drawing attention as an eco-friendly fuel because it emits very little air pollutants such as sulfur oxides, nitrogen oxides, and particulate matter (PM). Because of these advantages, the use of engines using natural gas as fuel is increasing in ships and automobiles.

그런데 천연가스는 메탄을 주성분으로 포함하며, 메탄은 강력한 탄소-수소 결합을 갖고 있어서 상당히 안정한 상태로 존재하기 때문에, 엔진에서 완전히 소모되지 않고 배출될 경우 배기가스 온도 조건에서는 자연적으로 산화되지 않아 미처리된 상태로 대기 중에 그대로 배출된다.However, natural gas contains methane as its main component, and since methane has a strong carbon-hydrogen bond and exists in a fairly stable state, when it is discharged without being completely consumed by the engine, it is not naturally oxidized under exhaust gas temperature conditions, so it is untreated. It is emitted as it is into the atmosphere.

한편, 메탄(CH4)은 동등한 양의 이산화탄소(CO2)에 비해 28배 이상의 지구온난화가스물질로서 강력한 온실가스이다. 지구 온난화의 문제를 해결하기 위해서는 배기가스에서 배출되는 메탄의 양을 줄여야 하며, 최근 국제해사기구에서 GHG(지구온난화가스, Green House gases) 배출 저감을 위한 규제강화에 따라 이산화탄소(CO2) 등 GHG 배출규제가 거론되고 있으며, 메탄이 대기 중으로 배출되지 않는 기술이 요구되고 있다.On the other hand, methane (CH4) is a strong greenhouse gas as a global warming gas substance that is 28 times more than equivalent amount of carbon dioxide (CO2). In order to solve the problem of global warming, the amount of methane emitted from exhaust gas must be reduced. Recently, according to the International Maritime Organization's strengthened regulation for reducing GHG (Green House gases) emissions, GHG emissions such as carbon dioxide (CO2) Regulations are being discussed, and technology that does not emit methane into the atmosphere is required.

이와 같은 요구에 따라 환경 오염에 주요한 원인으로 작용하는 내연기관 등의 배기가스를 효율적으로 정화하기 위하여, 특히 배기가스에 다량으로 포함된 메탄을 효율적으로 제거하는 방법에 대한 다양한 연구가 진행 중에 있다.In accordance with such a demand, in order to efficiently purify exhaust gases such as internal combustion engines, which act as a major cause of environmental pollution, in particular, various studies on methods for efficiently removing methane contained in exhaust gases in large quantities are in progress.

메탄을 효율적으로 제거하는 하나의 방법으로, 메탄을 산화시키는 데에 촉매를 이용하는 기술이 개발되고 있다.As one method of efficiently removing methane, a technology using a catalyst to oxidize methane is being developed.

최근에는 귀금속을 알루미나 등의 산화물 담체에 담지한 것으로, 팔라듐이나 백금을 알루미나에 담지한 촉매가 널리 알려지고 있으며, 압축천연가스 엔진을 장착한 선박 및 자동차 등에서 연비 성능을 향상시키기 위해 연료 희박 분위기(Lean-burn)에서 엔진을 작동할 경우 배기가스에 포함된 메탄을 정화하기 위해 팔라듐과 백금이 혼합된 산화촉매(Oxidation Catalyst)를 이용하는 기술이 개발되고 있다.Recently, catalysts in which precious metals are supported on an oxide carrier such as alumina, and palladium or platinum supported on alumina are widely known, and fuel lean atmospheres ( A technology using an oxidation catalyst mixed with palladium and platinum is being developed to purify methane contained in exhaust gas when the engine is operated in lean-burn.

하지만, 팔라듐의 경우에는 촉매 상에 산소가 흡착되면 PdO(Palladium Oxidation)이 발생하게 되고, PdO에 의해 메탄의 산화성능이 저하된다.However, in the case of palladium, when oxygen is adsorbed on the catalyst, PdO (Palladium Oxidation) is generated, and methane oxidation performance is reduced by PdO.

따라서 팔라듐 기반 메탄산화촉매를 이용하여 메탄을 제거하기 위해서는 메탄산화촉매에 발생하는 PdO을 제거하는 촉매재생의 기술 개발이 시급한 상태이며, 특히 엔진이 연료 희박 분위기(Lean-burn) 상태로 운전될 경우, 과잉 상태의 산소가 메탄산화촉매와 반응하여 PdO의 발생이 현저하게 증가되는 문제점이 있다.Therefore, in order to remove methane using a palladium-based methane oxidation catalyst, it is urgent to develop catalyst regeneration technology to remove PdO generated in the methane oxidation catalyst, especially when the engine is operated in a lean-burn condition. However, there is a problem in that excessive oxygen reacts with the methane oxidation catalyst and significantly increases the generation of PdO.

대한민국 등록특허 제10-1909303호Republic of Korea Patent No. 10-1909303 대한민국 공개특허 제10-2016-0112179호Republic of Korea Patent Publication No. 10-2016-0112179 대한민국 등록특허 제10-1598390호Republic of Korea Patent No. 10-1598390

본 발명은 앞에서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 발명된 것으로서, PdO에 의해 메탄산화촉매의 메탄 산화성능이 저하될 경우 메탄산화촉매를 재생하는 메탄산화촉매 재생장치 및 재생방법을 제공하는 데 그 목적이 있다.The present invention was invented to solve the problems of the prior art as described above, and provides a methane oxidation catalyst regeneration device and regeneration method for regenerating the methane oxidation catalyst when the methane oxidation performance of the methane oxidation catalyst is lowered by PdO It has its purpose.

상기와 같은 목적을 달성하기 위한 본 발명에 따른 메탄산화촉매 재생장치는 메탄산화촉매가 장착된 반응기와, 메탄산화촉매에 형성된 PdO를 환원시키는 재생가스를 반응기에 주입할 수 있도록 반응기에 연결된 재생가스 실린더를 포함하는 것을 기술적 특징으로 한다.In order to achieve the above object, the methane oxidation catalyst regeneration apparatus according to the present invention includes a reactor equipped with a methane oxidation catalyst and a regeneration gas connected to the reactor to inject a regeneration gas for reducing PdO formed in the methane oxidation catalyst into the reactor The technical feature is that it contains a cylinder.

또한, 본 발명의 바람직한 실시예에 따르면, 재생가스 실린더에 수용된 고압의 재생가스를 반응기 내부로 주입할 수 있도록 재생가스 실린더를 반응기에 탈착 또는 장착 가능하도록 반응기에 설치된 포트를 더 포함한다.In addition, according to a preferred embodiment of the present invention, a port installed in the reactor is further included to detach or mount the regeneration gas cylinder to the reactor so that the high-pressure regeneration gas accommodated in the regeneration gas cylinder can be injected into the reactor.

또한, 본 발명의 바람직한 실시예에 따르면, 포트는 메탄산화촉매가 장착된 구역의 아래에 형성된다.In addition, according to a preferred embodiment of the present invention, the port is formed below the area where the methane oxidation catalyst is mounted.

또한, 본 발명의 바람직한 실시예에 따르면, 재생가스는 N2, H2, HC 중 어느 한 종류의 가스 또는 이들 가스가 혼합된 가스로 구성된다.In addition, according to a preferred embodiment of the present invention, the regeneration gas is composed of any one of N2, H2, and HC, or a mixture of these gases.

상기와 같은 목적을 달성하기 위한 본 발명은 메탄산화촉매에 형성된 PdO를 환원시켜 메탄산화촉매를 재생하는 방법으로서, 메탄산화촉매가 장착된 반응기를 폐쇄하는 단계와, 폐쇄된 반응기의 내부로 재생가스를 주입하여 PdO를 환원하는 단계를 포함하는 것을 기술적 특징으로 한다.The present invention for achieving the above object is a method for regenerating the methane oxidation catalyst by reducing PdO formed in the methane oxidation catalyst, comprising the steps of closing a reactor equipped with the methane oxidation catalyst, and regenerating gas into the closed reactor It is technically characterized by including the step of reducing PdO by injecting.

또한, 본 발명의 바람직한 실시예에 따르면, 반응기에 설치된 포트에 고압의 재생가스 실린더를 장착하여 재생가스 실린더에 수용된 재생가스가 압력차에 의해 반응기의 내부로 주입된다.Further, according to a preferred embodiment of the present invention, a high-pressure regeneration gas cylinder is installed in a port installed in the reactor, and the regeneration gas accommodated in the regeneration gas cylinder is injected into the reactor by a pressure difference.

또한, 본 발명의 바람직한 실시예에 따르면, 재생가스는 N2, H2, HC 중 어느 한 종류의 가스 또는 이들 가스가 혼합된 가스로 구성된다.In addition, according to a preferred embodiment of the present invention, the regeneration gas is composed of any one of N2, H2, and HC, or a mixture of these gases.

앞서 설명한 바와 같이, 본 발명에 따른 메탄산화촉매 재생장치 및 재생방법은 반응기 내부에 재생가스를 주입하여 메탄산화촉매에 발생한 PdO를 환원시켜 메탄 산화성능을 향상시켜 대기 중으로 배출되는 메탄을 최소화할 수 있게 구성한 것으로서, 재생가스의 주입으로 메탄산화촉매를 환원시킬 수 있는 구조적으로 간단하면서 재생 효과가 크다는 장점이 있다.As described above, the methane oxidation catalyst regeneration apparatus and regeneration method according to the present invention reduce PdO generated in the methane oxidation catalyst by injecting regeneration gas into the reactor to improve methane oxidation performance, thereby minimizing methane discharged into the atmosphere. It has the advantage of being structurally simple and having a great regeneration effect that can reduce the methane oxidation catalyst by injecting regeneration gas.

재생가스를 주입하기 위한 설비 또한 재생가스가 압축된 압축 실린더와 압축 실린더를 반응기에 연결하여 재생가스를 주입하는 포트의 구성만으로 메탄산화촉매의 환원이 가능하도록 구성됨에 따라 설비가 간단하다는 장점이 있다.The equipment for injecting the regeneration gas also has the advantage of being simple as it is configured to reduce the methane oxidation catalyst only by configuring a compression cylinder in which the regeneration gas is compressed and a port for injecting the regeneration gas by connecting the compression cylinder to the reactor. .

도 1은 본 발명에 따른 메탄산화촉매 반응기를 나타낸 단면도이고,
도 2는 도 1에 도시된 반응기에 압축 실린더를 장착한 상태를 나타낸 개념도이다.
1 is a cross-sectional view showing a methane oxidation catalyst reactor according to the present invention;
2 is a conceptual diagram showing a state in which a compression cylinder is mounted on the reactor shown in FIG. 1;

아래에서는 본 발명에 따른 메탄산화촉매 재생장치 및 재생방법의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명한다.Hereinafter, a preferred embodiment of a methane oxidation catalyst regeneration apparatus and regeneration method according to the present invention will be described in detail with reference to the accompanying drawings.

도면에서, 도 1은 본 발명에 따른 메탄산화촉매 반응기를 나타낸 단면도이고, 도 2는 도 1에 도시된 반응기에 압축 실린더를 장착한 상태를 나타낸 개념도이다.In the drawings, FIG. 1 is a cross-sectional view showing a methane oxidation catalyst reactor according to the present invention, and FIG. 2 is a conceptual view showing a state in which a compression cylinder is mounted on the reactor shown in FIG.

도 1에 도시된 바와 같이, 엔진(10)에서 연장된 선단 배기관(11F)은 반응기(110)에 연결되고, 반응기(110)에서 연장된 후단 배기관(11B)은 대기 중 또는 이코노마이저로 연장된다.As shown in FIG. 1, the front exhaust pipe 11F extending from the engine 10 is connected to the reactor 110, and the rear exhaust pipe 11B extending from the reactor 110 is extended to the atmosphere or to the economizer.

따라서 엔진(10)에서 발생한 배기가스는 선단 배기관(11F)을 따라 반응기(110) 내부로 유입된다.Accordingly, the exhaust gas generated from the engine 10 is introduced into the reactor 110 along the front end exhaust pipe 11F.

반응기(110)는 그 하단에 선단 배기관(11F)이 연결되는 유입구(111)가 형성되고, 반응기(110)의 상단에는 후단 배기관(11B)이 연결되는 배출구(113)가 형성되며, 유입구(111)에는 입구 밸브(111V)가 그리고 배출구(113)에는 출구 밸브(113V)가 장착된다. In the reactor 110, an inlet 111 to which the front end exhaust pipe 11F is connected is formed at the bottom thereof, and an outlet 113 to which the rear end exhaust pipe 11B is connected is formed at the top of the reactor 110, and the inlet 111 ) is equipped with an inlet valve (111V) and an outlet valve (113V) is attached to the outlet (113).

이와 같이 구성된 반응기(110)에 있어서, 입구 밸브(111V)와 출구 밸브(113V)를 폐쇄하면 반응기(110) 내부가 폐쇄되고, 입구 밸브(111V)와 출구 밸브(113V)를 개방하면 엔진(10)에서 발생한 배기가스가 선단 배기관(11F)을 따라 반응기(110)로 유입된 후 후단 배기관(11B)을 따라 반응기(110) 외부로 배기된다.In the reactor 110 configured as described above, when the inlet valve 111V and the outlet valve 113V are closed, the inside of the reactor 110 is closed, and when the inlet valve 111V and the outlet valve 113V are opened, the engine 10 The exhaust gas generated in ) is introduced into the reactor 110 along the front end exhaust pipe 11F and then exhausted to the outside of the reactor 110 along the rear end exhaust pipe 11B.

한편, 반응기(110)의 내부에는 메탄산화촉매(Methane Oxidation Catalyst : MOC)(120)가 장착된다. 그 일 예로서 복수의 메탄산화촉매(120)가 배기가스의 유동방향을 따라 간격을 두고 반응기(110) 내부에 장착됨에 따라 유입구(111)로 유입된 배기가스가 배출구(113) 쪽으로 유동하면서 복수의 메탄산화촉매(120)를 순차적으로 통과하게 된다.Meanwhile, a methane oxidation catalyst (MOC) 120 is installed inside the reactor 110 . As an example, as the plurality of methane oxidation catalysts 120 are installed inside the reactor 110 at intervals along the flow direction of the exhaust gas, the exhaust gas introduced into the inlet 111 flows toward the outlet 113 while the plurality It passes through the methane oxidation catalyst 120 in sequence.

메탄산화촉매(120)는 팔라듐(Pd) 기반 촉매로서, 배기가스의 메탄(CH4)을 아래의 화학식 반응을 통해 물과 이산화탄소(CO2)로 산화시킨다.The methane oxidation catalyst 120 is a palladium (Pd)-based catalyst, and oxidizes methane (CH4) in exhaust gas to water and carbon dioxide (CO2) through the following chemical reaction.

Figure pat00001
Figure pat00001

따라서 반응기(110)로 유입된 메탄은 메탄산화촉매(120)를 통과하면서 상기 화학식 1과 같이 물과 이산화탄소로 산화된 후 후단 배기관(11B)을 통해 배기된다. Therefore, methane introduced into the reactor 110 is oxidized to water and carbon dioxide as shown in Chemical Formula 1 while passing through the methane oxidation catalyst 120 and then exhausted through the downstream exhaust pipe 11B.

메탄은 이산화탄소보다 28배가 강한 지구온난화가스물질로서, 메탄을 산화시켜 이산화탄소를 배기함에 따라 메탄 배출에 비해 지구온난화를 감소시킬 수 있다.Methane is a global warming gas substance that is 28 times stronger than carbon dioxide, and as methane is oxidized to emit carbon dioxide, global warming can be reduced compared to methane emissions.

한편, 메탄이 산화되는 중에 메탄산화촉매(120) 또한 산화되어 촉매 표면에 산화물질인 PdO가 형성된다. 촉매 표면에 산화물질인 PdO가 형성되면 메탄과의 접촉이 차단되어 촉매반응 즉 메탄의 산화 효율이 저하된다.Meanwhile, while methane is oxidized, the methane oxidation catalyst 120 is also oxidized, and PdO, an oxidizing substance, is formed on the surface of the catalyst. When PdO, an oxidizing substance, is formed on the surface of the catalyst, the contact with methane is blocked and the catalytic reaction, that is, the efficiency of methane oxidation is lowered.

본 발명은 메탄산화촉매(120)에 산화물질인 PdO가 형성되었을 경우 발생하는 메탄의 산화성능 저하를 다시 향상시킬 수 있도록 메탄산화촉매(120)를 재생하는 것에 그 목적이 있으며, 목적을 구현하기 위해서 반응기에 재생가스를 주입할 수 있게 반응기(110)의 하단부에 재생가스 포트(130)를 형성하고, 재생가스 포트(130)에는 재생가스가 고압으로 압축 저장된 재생가스 실린더(140)가 연결된다. 재생가스 실린더(140)는 반응기(110)의 재생가스 포트(130)에 탈장착할 수 있게 구성하여 재생가스 주입 시에 재생가스 포트(130)에 재생가스 실린더(140)를 장착하여 재생가스를 주입하고, 주입이 완료되면 재생가스 포트(130)를 폐쇄하고 재생가스 실린더(140)를 탈착한다.An object of the present invention is to regenerate the methane oxidation catalyst 120 so as to improve the oxidation performance of methane generated when PdO, an oxidizing agent, is formed in the methane oxidation catalyst 120. In order to inject regeneration gas into the reactor, a regeneration gas port 130 is formed at the lower end of the reactor 110, and a regeneration gas cylinder 140 in which regeneration gas is compressed and stored under high pressure is connected to the regeneration gas port 130. . The regeneration gas cylinder 140 is configured to be detachable from the regeneration gas port 130 of the reactor 110, and when regeneration gas is injected, the regeneration gas cylinder 140 is installed in the regeneration gas port 130 to inject the regeneration gas. When the injection is completed, the regeneration gas port 130 is closed and the regeneration gas cylinder 140 is detached.

이를 위해서는 재생가스 포트(130)에는 포트(130)를 개폐하는 개폐밸브(130V)가 장착된 것을 바람직하다.To this end, it is preferable that the regeneration gas port 130 is equipped with an opening/closing valve 130V for opening and closing the port 130 .

다른 방식으로 재생가스 포트와 재생가스 실린더를 재생가스 공급라인으로 연결하고, 재생가스 공급라인에 개폐밸브를 설치하여 재생가스의 주입 시에 개폐밸브를 개방함에 따라 재생가스 공급라인을 통해 재생가스가 반응기에 주입되도록 구성할 수도 있다.In another way, the regeneration gas port and the regeneration gas cylinder are connected to the regeneration gas supply line, and an on/off valve is installed in the regeneration gas supply line so that the regeneration gas flows through the regeneration gas supply line as the on/off valve is opened when the regeneration gas is injected. It can also be configured to be injected into a reactor.

한편, 반응기(110)로 주입되는 재생가스는 PdO를 환원할 수 있는 N2, H2, HC 중 어느 한 종류의 가스 또는 특정 혼합비로 혼합된 가스로 구성할 수 있다.Meanwhile, the regeneration gas injected into the reactor 110 may be composed of any one of N2, H2, and HC capable of reducing PdO or a gas mixed at a specific mixing ratio.

통상적으로 반응기(110)의 입구 밸브(111V)와 출구 밸브(113V)를 폐쇄하면 반응기(110) 내부는 대기압 정도의 압력이 형성되며, 재생가스 실린더(140)의 내부압력은 반응기(110) 내부의 압력보다 훨씬 큰 압력을 갖고 있어 재생가스 실린더(140)에서 반응기(110)의 내부로 재생가스가 유입되며, 반응기(110)의 하단으로 유입된 재생가스는 압력차에 의해 반응기(110)의 하부에서 상부로 유동하면서 간격을 두고 배치된 메탄산화촉매(120)의 PdO를 환원시킨다.Typically, when the inlet valve 111V and the outlet valve 113V of the reactor 110 are closed, a pressure of about atmospheric pressure is formed inside the reactor 110, and the internal pressure of the regeneration gas cylinder 140 is reduced to the inside of the reactor 110. The regeneration gas flows into the reactor 110 from the regeneration gas cylinder 140 because it has a pressure much higher than the pressure of the reactor 110. While flowing from the bottom to the top, the PdO of the methane oxidation catalyst 120 disposed at intervals is reduced.

메탄산화촉매(120)에서 PdO를 환원시키는 재생작업을 통해 메탄산화촉매(120)는 재생되고, 이후 입구 밸브(111V)와 출구 밸브(113V)를 개방하여 배기가스의 메탄이 반응기(110) 내부로 유입되면 화학식 1의 반응식과 같이 메탄의 산화 성능이 향상된다.The methane oxidation catalyst 120 is regenerated through a regeneration operation of reducing PdO in the methane oxidation catalyst 120, and then the inlet valve 111V and the outlet valve 113V are opened so that methane in the exhaust gas is discharged into the reactor 110. When introduced into, the oxidation performance of methane is improved as shown in the reaction formula of Formula 1.

10 : 엔진
11F, 11B : 배기관
110 : 반응기
111 : 유입구
111V : 입구 밸브
113 : 배출구
113V : 출구 밸브
120 : 메탄산화촉매(MOC)
130 : 재생가스 포트
130V : 개폐밸브
140 : 재생가스 실린더
10 : engine
11F, 11B: exhaust pipe
110: reactor
111: inlet
111V: inlet valve
113: outlet
113V: Outlet valve
120: methane oxidation catalyst (MOC)
130: regeneration gas port
130V: open/close valve
140: regeneration gas cylinder

Claims (8)

메탄산화촉매가 장착된 반응기와,
메탄산화촉매에 형성된 PdO를 환원시키는 재생가스를 반응기에 주입할 수 있도록 반응기에 연결된 재생가스 실린더를 포함하는 것을 특징으로 하는 메탄산화촉매 재생장치.
A reactor equipped with a methane oxidation catalyst;
An apparatus for regenerating a methane oxidation catalyst comprising a regeneration gas cylinder connected to the reactor to inject a regeneration gas for reducing PdO formed in the methane oxidation catalyst into the reactor.
제1항에 있어서,
재생가스 실린더에 수용된 고압의 재생가스를 반응기 내부로 주입할 수 있도록 재생가스 실린더를 반응기에 탈착 또는 장착 가능하도록 반응기에 설치된 포트를 더 포함하는 것을 특징으로 하는 메탄산화촉매 재생장치.
According to claim 1,
The methane oxidation catalyst regeneration apparatus further comprising a port installed in the reactor to detach or attach the regeneration gas cylinder to the reactor so that the high-pressure regeneration gas accommodated in the regeneration gas cylinder can be injected into the reactor.
제2항에 있어서,
반응기에는 엔진에서 배출된 배기가스가 반응기 내부로 유입되도록 반응기 하부에 유입구가 형성되고, 반응기의 상부에는 배기가스가 배출되는 배출구가 형성되며, 유입구에는 입구 밸브가 장착되고, 배출구에는 출구 밸브가 장착된 것을 특징으로 하는 메탄산화촉매 재생장치.
According to claim 2,
In the reactor, an inlet is formed at the bottom of the reactor so that exhaust gas discharged from the engine flows into the reactor, an outlet for exhaust gas is discharged at the top of the reactor, an inlet valve is installed at the inlet port, and an outlet valve is installed at the outlet port. Methane oxidation catalyst regeneration apparatus, characterized in that.
제2항에 있어서,
포트는 메탄산화촉매가 장착된 구역의 아래에 형성된 것을 특징으로 하는 메탄산화촉매 재생장치.
According to claim 2,
The port is a methane oxidation catalyst regenerator, characterized in that formed below the area in which the methane oxidation catalyst is mounted.
제1항 내지 제4항 중 어느 한 항에 있어서,
재생가스는 N2, H2, HC 중 어느 한 종류의 가스 또는 이들 가스가 혼합된 가스로 구성된 것을 특징으로 하는 메탄산화촉매 재생장치.
According to any one of claims 1 to 4,
The regeneration gas is a methane oxidation catalyst regeneration device, characterized in that composed of any one of N2, H2, HC or a mixed gas of these gases.
메탄산화촉매에 형성된 PdO를 환원시켜 메탄산화촉매를 재생하는 방법으로서,
메탄산화촉매가 장착된 반응기를 폐쇄하는 단계와,
폐쇄된 반응기의 내부로 재생가스를 주입하여 PdO를 환원하는 단계를 포함하는 것을 특징으로 하는 메탄산화촉매 재생방법.
A method of regenerating a methane oxidation catalyst by reducing PdO formed in the methane oxidation catalyst,
Closing the reactor equipped with the methane oxidation catalyst;
A method for regenerating a methane oxidation catalyst comprising the step of reducing PdO by injecting a regeneration gas into a closed reactor.
제6항에 있어서,
반응기에 설치된 포트에 고압의 재생가스 실린더를 장착하여 재생가스 실린더에 수용된 재생가스가 압력차에 의해 반응기의 내부로 주입되는 것을 특징으로 하는 메탄산화촉매 재생방법.
According to claim 6,
A method for regenerating a methane oxidation catalyst, characterized in that a high-pressure regeneration gas cylinder is installed in a port installed in the reactor, and the regeneration gas accommodated in the regeneration gas cylinder is injected into the reactor by a pressure difference.
제6항 또는 제7항에 있어서,
재생가스는 N2, H2, HC 중 어느 한 종류의 가스 또는 이들 가스가 혼합된 가스로 구성된 것을 특징으로 하는 메탄산화촉매 재생방법.
According to claim 6 or 7,
The regeneration gas is a methane oxidation catalyst regeneration method, characterized in that composed of any one of N2, H2, HC or a mixture of these gases.
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KR101598390B1 (en) 2014-06-18 2016-03-02 현대중공업 주식회사 Exhaust gas purification catalyst and method for preparing the same
KR20160112179A (en) 2015-03-18 2016-09-28 현대중공업 주식회사 Purification Catalyst for Natural Gas Engine Exhaust
KR101909303B1 (en) 2010-12-21 2018-10-17 존슨 맛쎄이 퍼블릭 리미티드 컴파니 Apparatus for treating exhaust gas of lean burn internal combustion engine comprising oxidation catalyst and method for recovering the oxidation activity of an oxidation catalyst

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101909303B1 (en) 2010-12-21 2018-10-17 존슨 맛쎄이 퍼블릭 리미티드 컴파니 Apparatus for treating exhaust gas of lean burn internal combustion engine comprising oxidation catalyst and method for recovering the oxidation activity of an oxidation catalyst
KR101598390B1 (en) 2014-06-18 2016-03-02 현대중공업 주식회사 Exhaust gas purification catalyst and method for preparing the same
KR20160112179A (en) 2015-03-18 2016-09-28 현대중공업 주식회사 Purification Catalyst for Natural Gas Engine Exhaust

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