KR101189318B1 - Apparatus For Providing Aqueous Ammonia Urea - Google Patents

Apparatus For Providing Aqueous Ammonia Urea Download PDF

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KR101189318B1
KR101189318B1 KR1020050120209A KR20050120209A KR101189318B1 KR 101189318 B1 KR101189318 B1 KR 101189318B1 KR 1020050120209 A KR1020050120209 A KR 1020050120209A KR 20050120209 A KR20050120209 A KR 20050120209A KR 101189318 B1 KR101189318 B1 KR 101189318B1
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urea
ammonia
exhaust gas
exhaust pipe
exhaust
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KR1020050120209A
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Korean (ko)
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KR20070060535A (en
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김동우
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust 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
    • F01N3/18—Exhaust 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
    • F01N3/20—Exhaust 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

본 발명은 암모니아화 된 유레아 공급장치에 관한 것으로 디젤 엔진의 배기관에 유레아를 분사하는 유레아 공급장치에 있어서, 상기 유레아 공급장치는 유레아를 저장하는 유레아탱크(10)와, 상기 유레아탱크(10)와 배기관(1)을 연결하여 저장된 유레아를 배기관(1)으로 공급하는 유레아공급관(20)과, 배기관(1) 내부에 구비되어 유레아공급관(20)의 배출구와 연계되어 유레아를 암모니아화하여 배기관(1) 내로 배출하는 암모니아변환수단(30)과, 상기 암모니아변환수단(30)을 제어하는 전자제어장치(50)를 포함하여 유레아탱크(10)에 저장된 유레아가 배기관(1)으로 공급되기 전 암모니아화되어 배기관(1) 내부로 공급되어 배기가스에 포함된 NOx의 제거율을 높이고, 저온 배기 중 유레아가 암모니아화되지 못하고 슬립되는 현상을 방지하여 배기가스 정화 중 유레아의 손실을 방지할 수 있는 것이다.The present invention relates to an ammonia-ized urea supply apparatus, comprising: a urea supply apparatus for injecting urea into an exhaust pipe of a diesel engine, the urea supply apparatus comprising a urea tank (10) for storing urea, and the urea tank (10); The urea supply pipe 20 is connected to the exhaust pipe 1 to supply the stored urea to the exhaust pipe 1, and is provided inside the exhaust pipe 1 so as to ammonia the urea in connection with the outlet of the urea supply pipe 20. Ammonia before the urea stored in the urea tank 10 is supplied to the exhaust pipe 1, including the ammonia converting means 30 discharged into the c) and the electronic control device 50 controlling the ammonia converting means 30. To increase the removal rate of NOx contained in the exhaust gas and to prevent the urea from slipping ammonia and slipping during low temperature exhaust. The loss of the child can be prevented.

따라서 유리아 SCR(Selective Catalytic Reduction) 시스템에서 유리아를 배기관(1)으로 배기가스를 처리할 수 있는 최적의 상태로 보다 안정적으로 공급하여 높은 NOx 환원율과 낮은 암모니아 슬립율을 제공하여 전체적인 배기가스의 오염물질 제거율을 증대시키고, 배기가스 처리 시 사용되는 유레아의 소모를 줄여 경제성을 향상시킬 수 있는 것이다.Therefore, in the SCR (Free Selective Catalytic Reduction) system, the glass is supplied more stably to the exhaust pipe (1) in an optimal state to process the exhaust gas, thereby providing a high NOx reduction rate and a low ammonia slip rate, thereby contaminating the overall exhaust gas. Increasing the removal rate and reducing the consumption of urea used in the exhaust gas treatment can improve the economics.

Description

암모니아화 된 유레아 공급장치{Apparatus For Providing Aqueous Ammonia Urea}Apparatus For Providing Aqueous Ammonia Urea}

도 1 은 본 발명의 구성을 개략적으로 도시한 개략도1 is a schematic diagram schematically showing a configuration of the present invention

도 2 는 본 발명의 암모니아변환수단을 도시한 단면도Figure 2 is a cross-sectional view showing ammonia conversion means of the present invention

*도면 중 주요 부호에 대한 설명** Description of the major symbols in the drawings *

1 : 배기관 10 : 유레아탱크1: exhaust pipe 10: urea tank

20 : 유레아공급관 21 : 펌프20: urea supply pipe 21: pump

22 : 오리피스부 23 : 제어밸브22: orifice portion 23: control valve

30 : 암모니아변환수단 31 : 유레아히터30: ammonia conversion means 31: urea heater

32 : 다공체부재 40 : 스태틱믹서부32: porous member 40: static mixer

50 : 전자제어장치50: electronic control device

본 발명은 암모니아화 된 유레아 공급장치에 관한 것으로 더 상세하게는 유레아를 분사할 경우 배기가스와 용이하게 혼합할 수 있도록 발명된 것이다.The present invention relates to an ammonia-ized urea supply device, and more particularly, to be easily mixed with exhaust gas when urea is injected.

일반적으로, 자동차는 형태에 따라 승용차나, 버스, 트럭 등으로 분류되나 같은 차종이라 할지라도 사용되는 연료의 종류에 따라 가솔린차량, 디젤 차량, LPG 차량으로 구분될 수 있다.In general, a car is classified into a passenger car, a bus, a truck, etc., depending on the type, but the same car may be classified into a gasoline vehicle, a diesel vehicle, or an LPG vehicle according to the type of fuel used.

이 중 디젤 차량은 고연비를 가지고 고출력 및 고부하 운전이 가능함은 물론 그 유류비가 싸 수요가 계속 증가하고 있는 실정이다.Among them, diesel vehicles have high fuel efficiency and high power and high load operation, and their fuel costs are low, and demand is continuously increasing.

이 디젤 차량은 배기가스가 그대로 배출될 경우 그 오염도가 매우 높으므로 이에 대응하기 위하여 디젤 엔진의 배기가스 규제가 강화되고 있는 추세이다.This diesel vehicle has a very high pollution if the exhaust gas is discharged as it is, the exhaust gas regulation of the diesel engine is being tightened to cope with this.

그리고 이 디젤차량의 대기오염은 주로 질소산화물(NOx)과 입자상물질(PM)에 의해 발생한다.And the air pollution of this diesel vehicle is mainly caused by nitrogen oxides (NOx) and particulate matter (PM).

따라서 디젤 차량의 배기 규제의 주요한 대상물질은 질소산화물과 입자상물질이며 배기가스 재순환 장치(Exhaust Gas Recirculation)에 의한 질소산화물 농도 저감과, 입자상물질을 저감하기 위한 엔진의 성능 개선 및 개량을 하고 있다.Therefore, the main target materials for the exhaust regulation of diesel vehicles are nitrogen oxides and particulate matter, and the reduction of nitrogen oxide concentration by exhaust gas recirculation, and the improvement and improvement of the performance of the engine for reducing particulate matter.

이러한 디젤 차량의 배기가스를 처리하는 기술로는 통상 입자상의 물질을 걸러주는 입자상물질 제거용 필터 시스템 또는 배기가스 라인에 촉매수용액을 분사하는 촉매분사시스템이 있다.As a technique for treating the exhaust gas of such a diesel vehicle, a particulate matter removal filter system for filtering particulate matter or a catalyst injection system for injecting a catalyst aqueous solution into an exhaust gas line.

이 촉매분사시스템은 근래에 촉매수용액으로 질소산화물 제거율이 우수한 유리아 첨가제(Urea Agent)를 이용하는 DeNox후처리장치(Urea-Based Selective Catalytic Reduction of NOx; Urea-SCR)가 주로 사용되고 있는 추세이다.In recent years, the catalyst spraying system has been mainly used with a DeNox post-treatment unit (Urea-SCR) using a Urea Agent, which has a high removal rate of nitrogen oxide as a catalyst aqueous solution.

이 유리아SCR(Selective Catalytic Reduction)시스템은 유리아(Urea;NH2-Co-NH2;요소)는 배기가스 라인에 분사되어 배기가스와 혼합되면서 120℃ 이상에서 열분해(Thermal Decomposition)하여 암모니아(NH3)와 HNCO가 되고, 160℃ 이상에서 HNCO는 물분해(hydrolsis)되어 NH3와 CO2로 된다.Selective Catalytic Reduction (SCR) system uses Urea (NH 2 -Co-NH 2 ; urea) sprayed on the exhaust gas line and mixed with the exhaust gas to thermally decompose at 120 ℃ or higher to ammonia (NH3). And HNCO, HNCO is hydrolized above 160 ° C to NH3 and CO2.

따라서 유리아를 배기가스 라인에 분사하면 고온에 의해 암모니아화되어 배기가스의 NOx를 N2 + O2로 변환시켜 배출하는 것이다.Therefore, when the glass is injected into the exhaust gas line, it is ammoniad by the high temperature, and the NOx of the exhaust gas is N 2. + O 2 to convert to the discharge.

그러나 상기한 종래의 유리아SCR(Selective Catalytic Reduction)시스템은 배기가스라인에 유레아를 공급하는 공급장치의 인텍터가 인젝션 노즐 개방시간에 의해 분사량을 제어하고, 그 인젝터의 위치가 배기관이므로 유레아 탱크에서 배기가스 라인으로 직접 분사되고, 유레아 탱크 내의 온도가 일정치 않을 경우 암모니아화되기 어려워 분사된 유레아가 배기가스와 완전히 혼합되어 배기가스의 NOx를 처리하기 힘든 폐단이 있었던 것이다.However, the conventional selective catalytic reduction (SCR) system of the present invention controls the injection amount by the injector opening time of the injector supplying the urea to the exhaust gas line, and the injector is exhausted from the urea tank because the position of the injector is the exhaust pipe. When injected directly into the gas line, and the temperature in the urea tank is not constant, it is difficult to ammonia, so the injected urea is completely mixed with the exhaust gas, and thus there is a difficult end to process the NOx of the exhaust gas.

또한 인젝터에서 유레아가 분사되는 인적터 홀이 유량의 연결, 단락 운전과 온도의 영향으로 막히는 문제점이 있었으며, 유레아 분사 시 배기가스와 혼합되지 않고 통과되는 배기가스가 발생되어 이를 방지하기 위한 최적의 분사가 어려운 폐단이 있었던 것이다.In addition, there was a problem that the injector hole in which the urea is injected from the injector is blocked by the flow connection, the short-circuit operation and the temperature, and the optimum injection to prevent the urea injection is caused by the exhaust gas passing through without being mixed with the exhaust gas. There was a difficult closure.

그리고 낮은 배기온도의 운전영역에서는 유레아 수용액의 물분해와 열분해를 통해 암모니아화되가 어려워 유래아가 활성화하기 위한 조건이 만족되지 않아 별도의 촉매시스템을 필요로 하는 폐단이 있었던 것이다.In addition, ammonia is difficult to ammonia through the water decomposition and pyrolysis of the urea solution in the low exhaust temperature operating range, so the conditions for activating the derived infants are not satisfied.

본 발명의 목적은 유레아 수용액을 유레아 공급장치에서 직접 암모니화하여 배기관으로 공급함으로써 배기가스의 높은 NOx 변환율을 얻을 수 있으며 배기관을 통해 배출되는 오염물질의 양을 줄일 수 있도록 하는 암모니아화 된 유레아 공급장치를 제공하는 데 있다.It is an object of the present invention to obtain a high NOx conversion rate of the exhaust gas by supplying the urea aqueous solution directly from the urea supply device to the exhaust pipe to obtain a high NOx conversion rate and to reduce the amount of pollutants discharged through the exhaust pipe. To provide.

이러한 본 발명의 목적은 디젤 엔진의 배기관에 유레아를 분사하는 유레아 공급장치에 있어서, 상기 유레아 공급장치는 유레아를 저장하는 유레아탱크와, 상기 유레아탱크와 배기관을 연결하여 저장된 유레아를 배기관으로 공급하는 유레아공급관과, 배기관 내부에 구비되어 유레아공급관의 배출구와 연계되어 유레아를 암모니아화하여 배기관 내로 배출하는 암모니아변환수단과 상기 암모니아변환수단을 제어하는 전자제어장치를 포함함으로써 달성된다.The object of the present invention is a urea supply device for injecting urea to the exhaust pipe of the diesel engine, the urea supply device is a urea tank for storing the urea, urea for connecting the urea tank and the exhaust pipe to supply the stored urea to the exhaust pipe It is achieved by including a supply pipe, an ammonia conversion means provided inside the exhaust pipe and connected to the outlet of the urea supply pipe to ammonia the urea and discharge it into the exhaust pipe, and an electronic controller for controlling the ammonia conversion means.

즉, 배기관 내에 유레아가 공급되기 전에 암모니아변환수단으로 암모니아화되어 배기관으로 공급됨으로 배기가스에 포함된 NOx의 변환율을 높여 NOx 처리 효율을 높일 수 있으며 유레아가 암모니아화 되지 못하고 소모되는 것을 방지하여 배기가스를 정화하는 유레아의 효율을 증대시킬 수 있는 것이다.That is, before urea is supplied into the exhaust pipe, it is ammonia converted into ammonia conversion means and supplied to the exhaust pipe, thereby increasing the conversion rate of NOx contained in the exhaust gas, thereby improving the NOx treatment efficiency, and preventing urea from being consumed without ammonia, thereby exhausting the exhaust gas. It is possible to increase the efficiency of urea to purify.

본 발명의 바람직한 실시 예를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1 은 본 발명의 구성을 개략적으로 도시한 개략도로서, 유레아탱크의 유레아가 유레아공급관을 통해 배기관으로 공급되고, 유레아공급관의 출구 측에는 암모니아변환수단이 장착되고, 이 암모니아변환수단을 거친 혼합가스는 배기관의 출구 측에 장착된 스태틱믹서부에 의해 더욱 용이하게 혼합시키는 것을 나타내고 있다.Figure 1 is a schematic diagram showing the configuration of the present invention, the urea of the urea tank is supplied to the exhaust pipe through the urea supply pipe, the outlet side of the urea supply pipe is equipped with ammonia conversion means, the mixed gas passed through this ammonia conversion means It shows that mixing is more easily performed by the static mixer part attached to the outlet side of the exhaust pipe.

도 2 는 본 발명의 암모니아변환수단을 도시한 단면도로서, 유레아공급관의 배출구를 통해 배출된 유레아는 히터에 의해 암모니아로 변환되는 온도로 가열된 후 이 히터의 외측에 구비된 다공체로 공급되는 것을 나타내고 있다.Figure 2 is a cross-sectional view showing the ammonia conversion means of the present invention, it is shown that the urea discharged through the outlet of the urea supply pipe is supplied to the porous body provided on the outside of the heater after being heated to a temperature converted to ammonia by the heater have.

이하, 도 1에서 도시한 바와 같이 유레아탱크(10)는 유레아공급관(20)을 통해 배기가스를 배출하는 배기관(1)에 연결된다.Hereinafter, as shown in FIG. 1, the urea tank 10 is connected to an exhaust pipe 1 for exhausting exhaust gas through the urea supply pipe 20.

이 유레아탱크(10)는 내부에 유레아를 저장할 수 있는 저장실이 구비되며 히팅장치(미도시)가 설치되어 유레아를 항온 보관하며 이는 종래의 공지된 기술이며 종래의 구성과 동일함을 밝혀둔다.The urea tank 10 is provided with a storage compartment for storing urea therein and a heating device (not shown) is installed to keep the urea at a constant temperature, which is a known technique and the same as the conventional configuration.

상기 유레아공급관(20)에는 유레아탱크(10)에 저장된 유레아를 배기가스로 이송시키는 펌프(21)가 장착되며, 오리피스부(22)가 구비된다.The urea supply pipe 20 is equipped with a pump 21 for transferring the urea stored in the urea tank 10 to the exhaust gas, the orifice portion 22 is provided.

이 오리피스부(22)는 유레아탱크(10)에서 배기관(1)으로 공급되는 유레아의 양을 제어하고 유동 흐름의 단속없이 흐르게 함으로써 기존의 인젝터 시스템의 노즐 홀 막힘현상을 방지할 수 있는 것이다.The orifice portion 22 is to control the amount of urea supplied from the urea tank 10 to the exhaust pipe 1 and to flow without interruption of the flow flow to prevent nozzle hole clogging of the existing injector system.

또 이 오리피스부(22)와 유레아공급관(20)의 배출구 사이에는 제어밸브(23)가 장착되며, 이 제어밸브(23)는 오리피스부(22)를 통과한 유레아를 유레아탱크(10)로 리턴시키거나 유레아공급관(20)의 배출구를 통해 배출되도록 통과시켜 배기배출되는 유레아의 양을 최종적으로 제어하는 것이다.A control valve 23 is mounted between the orifice portion 22 and the outlet of the urea supply pipe 20, and the control valve 23 returns the urea that has passed through the orifice portion 22 to the urea tank 10. By passing through or through the outlet of the urea supply pipe 20 is to finally control the amount of urea discharged.

이 유레아공급관(20)의 배출구에는 배출되는 유레아를 암모니아화시키는 암모니아변환수단(30)이 장착되며, 이 암모니아변환수단(30)은 도 2에서 도시한 바와 같이 유레아공급관(20)으로 배출되는 유레아를 일정온도 이상으로 가열하는 유레아 히터(31)와;The outlet of the urea supply pipe 20 is equipped with ammonia conversion means 30 for ammoniaizing the discharged urea, the ammonia conversion means 30 is a urea discharged to the urea supply pipe 20 as shown in FIG. Urea heater 31 for heating above a predetermined temperature;

상기 유레아히터(31)에서 가열된 유레아가 분사되어 배기가스와 혼합되도록 하는 다공체(32)로 구성된다.The urea heated in the urea heater 31 is composed of a porous body 32 to be injected and mixed with the exhaust gas.

다공체(32)는 세라믹 또는 메탈 파우더를 소결시켜 제조된 다공성 재질로써 전체 체적에 대한 공극의 비율인 공극률의 조정에 따라 유량을 조정할 수 있고, 이 공극을 통과하는 배기가스가 이 다공체(32)에 분사되는 유레아에 면접촉되어 혼합되게 되는 것이다.The porous body 32 is a porous material made by sintering ceramic or metal powder, and the flow rate can be adjusted according to the adjustment of the porosity, which is the ratio of the voids to the total volume, and the exhaust gas passing through the pores is supplied to the porous body 32. The surface contact with the urea is to be mixed is to be mixed.

이 유레아히터(31)는 전기히터와 온도센서가 설치되어 유레아의 온도를 일정온도, 160℃에서 180℃ 사이에서 제어시켜 유레아 수용액의 열분해와 물분해를 통해 암모니아(NH3)와 수증기를 생성시켜 다공체(32) 내로 분사시킨다.The urea heater 31 is equipped with an electric heater and a temperature sensor to control the temperature of the urea between a constant temperature, 160 ℃ to 180 ℃ to generate ammonia (NH3) and water vapor through the thermal decomposition and water decomposition of the urea solution porous material (32) is injected into.

다공체(32)는 분사된 유레아를 배기가스에 면접촉시켜 배기가스가 유레아와 잘 혼합된 혼합가스를 생성한다.The porous body 32 contacts the injected urea with the exhaust gas to produce a mixed gas in which the exhaust gas is well mixed with the urea.

또 상기 배기관(1)의 내부에는 상기 암모니아변환수단(30)을 거친 유레아와 배기가스를 혼합한 혼합가스를 믹싱시켜 배기가스의 NOx를 고효율로 환원시키는 스태틱믹서부(40)가 구비되며, 이 스태틱믹서부(40)는 종래에 공지되어 널리 적용되고 있는 구성으로 혼합가스를 더욱 잘 혼합시키도록 하는 것이다.In addition, the exhaust pipe 1 is provided with a static mixer 40 for reducing the NOx of the exhaust gas by mixing a mixed gas of urea and exhaust gas that has passed through the ammonia converting means 30 and high efficiency. The static mixer unit 40 is to mix the mixed gas better in a configuration that is known and widely applied in the related art.

그리고 상기 암모니아변환수단(30)은 차량의 전자제어장치(50)에 연계되어 배기가스의 온도를 온도센서로 감지하여 감지된 온도가 전자제어장치(50)로 전달된다.In addition, the ammonia conversion means 30 is connected to the electronic control device 50 of the vehicle to detect the temperature of the exhaust gas with a temperature sensor and the sensed temperature is transmitted to the electronic control device 50.

이 전자제어장치(50)는 온도센서에 의해 감지된 전기신호로 유레아히터(31)로 가열되는 유레아의 온도를 제어하며, 유레아가 유레아공급관(20)을 통과하도록 이송시키는 펌프(21) 및 제어밸브(23)를 제어하여 엔진의 출력에 따른 배기가스의 양을 측정하여 유레아가 배기관(1)내부로 공급되도록 하고, 유레아탱크(10) 내에 설치된 히터에 연계되어 저장되는 유레아의 온도를 제어할 수 있도록 한다. 통상, 배기가스의 양 측정을 위해서는 전술한 배기가스 재순환 장치(Exhaust Gas Recirculation)에 설치되어 엔진에서 나오는 배기가스 양을 검출하는 센서로부터 획득된다. 상기 센서는 전자제어장치(50)가 상기 재순환 장치를 제어하기 위해 요구하는 재순환 장치를 흐르는 배기가스 양의 측정을 위한 기본적이고 통상적인 구성요소이다.The electronic controller 50 controls the temperature of the urea heated by the urea heater 31 by the electric signal sensed by the temperature sensor, and controls the pump 21 and the urea to pass through the urea supply pipe 20. By controlling the valve 23 to measure the amount of exhaust gas according to the output of the engine so that the urea is supplied into the exhaust pipe (1), it is possible to control the temperature of the urea stored in connection with the heater installed in the urea tank (10) To help. In general, for measuring the amount of exhaust gas, it is obtained from a sensor installed in the above-described exhaust gas recirculation apparatus and detecting the amount of exhaust gas coming from the engine. The sensor is a basic and common component for the measurement of the amount of exhaust gas flowing through the recirculation device that the electronic controller 50 requires to control the recirculation device.

상기한 본 발명의 구성에 의하면, 유레아탱크에 저장된 유레아가 배기관으로 공급되기 전 암모니아화되어 배기관 내부로 공급되어 배기가스에 포함된 NOx의 제거율을 높이고, 저온 배기 중 유레아가 암모니아화되지 못하고 슬립되는 현상을 방지하여 배기가스 정화 중 유레아의 손실을 방지할 수 있는 것이다.According to the above-described configuration of the present invention, the urea stored in the urea tank is ammonia before being supplied to the exhaust pipe and supplied into the exhaust pipe to increase the removal rate of NOx contained in the exhaust gas, and the urea does not ammonia slip at low temperature exhaust. This prevents the loss of urea during exhaust gas purification.

따라서 유리아SCR(Selective Catalytic Reduction)시스템에서 유리아를 배기관으로 배기가스를 처리할 수 있는 최적의 상태로 보다 안정적으로 공급하여 높은 NOx 환원율과 낮은 암모니아 슬립율을 제공하여 전체적인 배기가스의 오염물질 제거율을 증대시키고, 배기가스 처리 시 사용되는 유레아의 소모를 줄여 경제성을 향상시킬 수 있는 것이다.Therefore, in the SCR (Selective Catalytic Reduction) system, the glass is supplied more stably to the exhaust gas in an optimal state to process the exhaust gas, providing high NOx reduction rate and low ammonia slip rate, thereby increasing the overall removal rate of pollutants in the exhaust gas. In addition, it is possible to improve the economics by reducing the consumption of urea used in the exhaust gas treatment.

Claims (5)

유레아를 저장하는 유레아탱크(10)와, 상기 유레아를 공급하도록 디젤 엔진의 배기관(1)에 연결된 유레아공급관(20)과, 상기 유레아탱크(10)에 저장된 유레아를 펌핑하는 펌프(21)와 상기 유레아공급관(20)의 배출구에 설치된 제어밸브(23)를 제어하는 전자제어장치(50)로 구성된 유레아 공급장치에 있어서, A urea tank 10 for storing urea, a urea supply pipe 20 connected to an exhaust pipe 1 of a diesel engine to supply the urea, and a pump 21 for pumping urea stored in the urea tank 10 and the In the urea supply device consisting of an electronic control device 50 for controlling the control valve 23 installed at the outlet of the urea supply pipe 20, 상기 유레아공급관(20)에는 오리피스부(22)가 더 설치되며, The urea supply pipe 20 is further provided with an orifice portion 22, 상기 배기관(1) 내부에는 상기 유레아공급관(20)의 배출구와 연계되어 유레아를 암모니아화하여 상기 배기관(1) 내로 분사하는 다공체(32)를 갖춘 암모니아변환수단(30)과, 상기 암모니아변환수단(30)을 거친 유레아와 배기가스를 혼합한 혼합가스를 믹싱시켜 배기가스의 NOx를 고효율로 환원시키는 스태틱믹서부(40)가 더 구비되고,In the exhaust pipe (1), ammonia conversion means (30) having a porous body (32) for injecting into the exhaust pipe (1) to ammonia the urea in conjunction with the outlet of the urea supply pipe (20) and the ammonia conversion means ( A static mixer unit 40 is further provided to reduce the NOx of the exhaust gas with high efficiency by mixing the mixed gas mixed with urea and exhaust gas passed through 30). 상기 전자제어장치(50)가 상기 암모니아변환수단(30)에 구비되어 상기 유레아공급관(20)으로 배출되는 유레아를 일정온도 이상으로 가열하는 유레아히터(31)를 제어하는 것을 특징으로 하는 암모니화 된 유레아 공급장치.The electronic controller 50 is provided in the ammonia conversion means 30 to control the urea heater 31 for heating the urea discharged to the urea supply pipe 20 above a predetermined temperature Urea Feeder. 청구항 1에 있어서, 상기 오리피스부(22)는 상기 펌프(21)와 상기 제어밸브(23)사이로 설치되는 것을 특징으로 하는 암모니화 된 유레아 공급장치.The ammonia-based urea supply device according to claim 1, wherein the orifice portion (22) is installed between the pump (21) and the control valve (23). 삭제delete 삭제delete 청구항 1에 있어서, 상기 전자제어장치(50)는 온도센서에 의해 감지된 전기신호로 유레아히터(31)로 가열되는 유레아의 온도를 제어하며, 유레아가 유레아공급관(20)을 통과하도록 이송시키는 펌프(21) 및 제어밸브(23)를 제어하며, 배기가스재순환장치(Exhaust Gas Recirculation)의 구성요소인 센서로부터 엔진의 출력으로 생성되는 배기가스의 양을 획득함으로써 일정한 양의 유레아가 배기관(1) 내부로 공급되도록 하고, 유레아탱크(10)내에 설치된 히터에 연계되어 저장되는 유레아의 온도를 제어할 수 있도록 한 것을 특징으로 하는 암모니화 된 유레아 공급장치.The pump of claim 1, wherein the electronic controller 50 controls the temperature of the urea heated by the urea heater 31 by the electric signal sensed by the temperature sensor, and transfers the urea to pass through the urea supply pipe 20. (21) and the control valve (23), by obtaining a certain amount of urea generated by the output of the engine from the sensor which is a component of the exhaust gas recirculation (Exhaust pipe 1) Ammonia urea supply device characterized in that to be supplied to the inside, to control the temperature of the urea stored in association with the heater installed in the urea tank (10).
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