KR20140126898A - UREA supply unit of Selective Catalyst Reduction system - Google Patents

UREA supply unit of Selective Catalyst Reduction system Download PDF

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KR20140126898A
KR20140126898A KR1020130045141A KR20130045141A KR20140126898A KR 20140126898 A KR20140126898 A KR 20140126898A KR 1020130045141 A KR1020130045141 A KR 1020130045141A KR 20130045141 A KR20130045141 A KR 20130045141A KR 20140126898 A KR20140126898 A KR 20140126898A
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South Korea
Prior art keywords
reducing agent
reduction agent
agent supply
pipe
diameter
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KR1020130045141A
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Korean (ko)
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김형주
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현대중공업 주식회사
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Publication of KR20140126898A publication Critical patent/KR20140126898A/en

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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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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

Abstract

The present invention relates to a reduction agent supply device for an SCR device capable of supplying a reduction agent at a stable pressure without using an accumulator even though a supply amount of the reduction agent is rapidly increased by designing the diameter of a reduction agent return pipe lager than the diameter of a discharge pipe of a reduction agent supply pump. The reduction agent supply device for the SCR device according to the present invention includes a reduction agent supply tank storing the reduction agent; the reduction agent supply pump pumping the reduction agent stored in the reduction agent supply tank; and the reduction agent return pipe supplying the reduction agent pumped by the reduction agent supply pump to the reduction agent supply pipes of each SCR device and returning the reduction agent, which is not supplied, back to the reduction agent supply tank. The reduction agent supply device for the SCR device is characterized in that the diameter of the reduction agent return pipe is relatively lager than the diameter of the discharging pipe of the reduction agent supply pump.

Description

SCR 장치의 환원제 공급장치{UREA supply unit of Selective Catalyst Reduction system}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a selective reduction catalyst

본 발명은 SCR 장치의 환원제 공급장치에 관한 것으로서, 보다 상세하게는 환원제 반송배관의 직경을 환원제 공급펌프의 출구측배관보다 크게 설계함으로써 환원제 공급유량이 급격히 증가하더라도 축압기(accumulator)의 요구 없이 안정적인 압력으로 환원제를 공급할 수 있는 SCR 장치의 환원제 공급장치에 관한 것이다.
The present invention relates to a reducing agent supply apparatus for an SCR apparatus, and more particularly, to a reducing agent supply pipe which is designed to have a diameter larger than that of an outlet side pipe of a reducing agent feed pump, To a reducing agent supply device of an SCR apparatus capable of supplying a reducing agent with pressure.

선박 엔진에서 배출되는 배기가스에는 환경에 유해한 질소산화물(NOx)이 포함되어 있어 이에 대한 처리가 요구된다. 질소산화물을 저감시키는 기술로는 SCR(selective catalyst reduction, 선택적 촉매 환원) 기술이 대표적이다. The exhaust gas emitted from the marine engine contains nitrogen oxide (NO x ), which is harmful to the environment, and treatment is required. SCR (selective catalyst reduction, selective catalytic reduction) is a typical technique for reducing nitrogen oxides.

SCR 기술은 환원제와 섞인 배기가스를 촉매층으로 통과시켜 질소산화물을 질소(N2)와 물(H2O)로 환원시키는 기술이며, 암모니아(NH3), 우레아(UREA, CO(NH2)2) 등이 환원제로 적용된다. SCR technology is a technology to reduce nitrogen oxides to nitrogen (N 2 ) and water (H 2 O) by passing exhaust gas mixed with a reducing agent through the catalyst layer and ammonia (NH 3), urea (UREA, CO (NH 2 ) 2 ) Etc. are applied as a reducing agent.

SCR 장치는 일반적으로 도 1과 같은 구성을 갖는다. 세부적으로, 질소산화물과 환원제의 반응을 유도하여 질소산화물을 환원시키는 촉매층을 구비한 SCR 챔버(110), SCR 챔버에 배기가스를 전달하는 배기가스 공급관(120), 배기가스 공급관(120)의 일측에 구비되어 배기가스와 환원제를 혼합하는 혼합유닛(130), 혼합유닛(130)에 환원제를 공급하는 환원제 공급관(141) 및 환원제 공급노즐장치(142) 등이 SCR 장치의 주요 구성요소로 포함된다. 참고로, SCR 장치의 일 예는 한국공개특허공보 제2010-132310호에 개시되어 있다. The SCR apparatus generally has a configuration as shown in Fig. Specifically, an SCR chamber 110 having a catalyst layer for inducing a reaction of nitrogen oxide and a reducing agent to reduce nitrogen oxides, an exhaust gas supply pipe 120 for transferring exhaust gas to the SCR chamber, A mixing unit 130 for mixing the exhaust gas and the reducing agent, a reducing agent supply pipe 141 for supplying a reducing agent to the mixing unit 130, and a reducing agent supply nozzle unit 142 are included as main components of the SCR apparatus . For reference, an example of the SCR device is disclosed in Korean Patent Laid-Open Publication No. 2010-132310.

종래의 SCR 장치에 있어서, 환원제를 공급하기 위한 구성으로 상술한 환원제 공급관 이외에 환원제 공급탱크, 환원제 공급펌프 및 환원제 공급밸브 등이 추가적으로 구비된다. 환원제 공급펌프는 환원제 공급탱크의 환원제를 환원제 공급관으로 이송시키고 환원제 공급밸브는 환원제 공급관 일측에 구비되어 환원제의 공급 및 차단을 제어하는 방식이다. In the conventional SCR apparatus, a reducing agent supply tank, a reducing agent supplying pump, a reducing agent supplying valve, and the like are additionally provided in addition to the reducing agent supplying tube described above in order to supply the reducing agent. The reducing agent supply pump transfers the reducing agent in the reducing agent supply tank to the reducing agent supply pipe, and the reducing agent supply valve is provided at the side of the reducing agent supply pipe to control the supply and blocking of the reducing agent.

선박에는 복수의 엔진이 구비되고 각각의 엔진에 SCR 챔버가 구비되는 구조이며, 각각의 SCR 챔버에 환원제가 공급되는 방식이다. 복수의 엔진은 모두 가동될 수도 있고 필요에 따라 몇 개의 엔진만이 동작될 수 있고 그에 따라, 엔진 가동에 따라 SCR 챔버도 선택적으로 동작된다. 또한, 환원제 공급펌프는 통상 1∼2개 구비되며, 1∼2개의 환원제 공급펌프를 통해 복수의 SCR 챔버에 환원제가 공급되는 방식이다. The ship has a structure in which a plurality of engines are provided and each engine is provided with an SCR chamber, and a reducing agent is supplied to each of the SCR chambers. The plurality of engines may all be operated, and only a few engines may be operated as required, and accordingly the SCR chamber is selectively operated according to the engine operation. The reducing agent supply pump is usually provided in one or two, and the reducing agent is supplied to the plurality of SCR chambers through one or two reducing agent supplying pumps.

한편, 엔진 가동률이 커져 동작되는 SCR 챔버의 수가 급격히 증가되면, 순간적으로 많은 양의 환원제가 요구되며 그에 따라 환원제 공급관 내의 압력이 급격히 저하되는 현상이 발생된다. 환원제 공급관 내의 압력이 저하되면 환원제의 공급이 원활히 진행되지 않는다. 이를 방지하기 위해 종래의 경우에는 환원제 공급관 일측에 축압기(accumulator)를 구비시켜 급격한 압력 저하 현상을 억제시켰다.
On the other hand, when the number of SCR chambers to be operated increases rapidly due to a large engine operating rate, a large amount of reducing agent is required instantaneously, and the pressure in the reducing agent supply pipe is rapidly lowered. When the pressure in the reducing agent supply pipe is lowered, the supply of the reducing agent does not progress smoothly. In order to prevent this, an accumulator is provided at one side of the reducing agent supply pipe to suppress the sudden pressure drop phenomenon.

한국공개특허공보 제2010-132310호Korean Patent Publication No. 2010-132310

본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로서, 환원제 반송배관의 직경을 환원제 공급펌프의 출구측배관보다 크게 설계함으로써 환원제 공급유량이 급격히 증가하더라도 축압기(accumulator)의 요구 없이 안정적인 압력으로 환원제를 공급할 수 있는 SCR 장치의 환원제 공급장치를 제공하는데 그 목적이 있다.
SUMMARY OF THE INVENTION The present invention has been devised to solve the problems as described above, and it is an object of the present invention to provide a reducing agent delivery pipe which is designed to have a diameter larger than the outlet side pipe of a reducing agent supply pump, It is an object of the present invention to provide a reducing agent supply device for an SCR apparatus capable of supplying a reducing agent.

상기의 목적을 달성하기 위한 본 발명에 따른 SCR 장치의 환원제 공급장치는 환원제를 저장하는 환원제 공급탱크와, 상기 환원제 공급탱크에 저장되어 있는 환원제를 펌핑하는 환원제 공급펌프 및 상기 환원제 공급펌프에 의해 펌핑된 환원제를 각 SCR 장치의 환원제 공급관에 공급함과 함께 미공급 환원제를 상기 환원제 공급탱크에 반송시키는 환원제 반송배관을 포함하여 이루어지며, 상기 환원제 반송배관의 직경은 상기 환원제 공급펌프의 출구측배관의 직경보다 상대적으로 큰 것을 특징으로 한다. In order to achieve the above object, the reducing agent supply device of the SCR apparatus according to the present invention comprises a reducing agent supply tank for storing a reducing agent, a reducing agent supplying pump for pumping the reducing agent stored in the reducing agent supplying tank, And a reducing agent delivery pipe for supplying the reducing agent to the reducing agent supply pipe of each SCR apparatus and returning the unreacted reducing agent to the reducing agent supply tank, wherein the diameter of the reducing agent delivery pipe is smaller than the diameter of the outlet side pipe of the reducing agent supply pump Is relatively large.

상기 환원제 반송배관의 직경은 상기 환원제 공급펌프의 출구측배관의 직경에 대비하여 1.5∼5배일 수 있다.
The diameter of the reducing agent delivery pipe may be 1.5 to 5 times the diameter of the outlet side pipe of the reducing agent supply pump.

본 발명에 따른 SCR 장치의 환원제 공급장치는 다음과 같은 효과가 있다. The reducing agent supply device of the SCR device according to the present invention has the following effects.

환원제 반송배관의 직경을 환원제 공급펌프의 출구측배관보다 상대적으로 크게 설계함으로써 환원제 공급유량이 급격히 증가하더라도 일정한 압력의 환원제를 각 SCR 장치의 환원제 공급관으로 안정적으로 공급할 수 있게 되며, 종래 기술의 축압기가 요구되지 않는다.
The diameter of the reducing agent return pipe is designed to be larger than that of the outlet side pipe of the reducing agent supply pump, so that even when the flow rate of the reducing agent is rapidly increased, the reducing agent having a constant pressure can be stably supplied to the reducing agent supply pipe of each SCR apparatus. Is not required.

도 1은 종래 기술에 따른 SCR 장치의 구성도.
도 2는 본 발명의 일 실시예에 따른 SCR 장치의 환원제 공급장치의 구성도. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional SCR device. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reducing agent supply apparatus for an SCR apparatus.

이하, 도면을 참조하여 본 발명의 일 실시예에 따른 SCR 장치의 환원제 공급장치를 상세히 설명하기로 한다. Hereinafter, a reducing agent supply apparatus for an SCR apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

도 2를 참조하면, 본 발명의 일 실시예에 따른 SCR 장치의 환원제 공급장치는 환원제 공급탱크(210) 및 환원제 공급펌프(220)를 포함하여 구성된다. Referring to FIG. 2, the reducing agent supplying apparatus of the SCR apparatus according to an embodiment of the present invention includes a reducing agent supplying tank 210 and a reducing agent supplying pump 220.

상기 환원제 공급탱크(210)는 우레아(UREA) 등의 환원제를 저장하며, 상기 환원제 공급탱크(210)는 상기 환원제 공급탱크(210)에 저장되어 있는 환원제를 펌핑하여 궁극적으로 각 SCR 장치에 환원제를 공급하는 역할을 한다. 상기 환원제 공급탱크(210) 및 환원제 공급펌프(220)는 하나 또는 복수개 구비될 수 있으며, 환원제 공급탱크(210)와 환원제 공급펌프(220)는 환원제 공급배관(230)을 통해 연결된다. 즉, 환원제 공급배관(230)을 통해 환원제 공급탱크(210)의 환원제가 환원제 공급펌프(220)로 공급된다. The reducing agent supply tank 210 stores a reducing agent such as UREA and the reducing agent supplying tank 210 pumps the reducing agent stored in the reducing agent supplying tank 210 to ultimately supply a reducing agent to each SCR apparatus. It serves as a supplier. The reducing agent supplying tank 210 and the reducing agent supplying pump 220 may be connected to each other through a reducing agent supplying pipe 230. That is, the reducing agent in the reducing agent supplying tank 210 is supplied to the reducing agent supplying pump 220 through the reducing agent supplying pipe 230.

상기 환원제 공급펌프(220)에 의해 펌핑된 환원제는 소정의 배관을 통해 각 SCR 장치의 환원제 공급관(250)으로 공급되는데, 상기 소정의 배관은 환원제를 환원제 공급탱크(210)로 반송시키는 배관과 연결된다. 이하에서는, 상기 소정의 배관과 환원제를 반송시키는 배관을 통칭하여 환원제 반송배관(240)이라 칭하기로 한다. 한편, 배관 내의 환원제를 환원제 공급탱크(210)로 반송시키는 이유는, SCR 장치들이 동작하지 않거나 SCR 장치들의 가동률이 낮을 때 고압의 환원제에 의해 밸브 장치들이 손상되는 것을 방지하기 위해 공급되지 않는 환원제를 환원제 공급탱크(210)로 반송시키는 것이다. The reducing agent pumped by the reducing agent supplying pump 220 is supplied to the reducing agent supplying pipe 250 of each SCR apparatus through a predetermined pipe which is connected to a pipe for returning the reducing agent to the reducing agent supplying tank 210 do. Hereinafter, the pipe for conveying the predetermined pipe and the reducing agent will be collectively referred to as a reducing agent return pipe 240. On the other hand, the reason why the reducing agent in the piping is returned to the reducing agent supply tank 210 is that a reducing agent that is not supplied is used to prevent the valve apparatus from being damaged by the high-pressure reducing agent when the SCR apparatuses are not operated or the operation rate of the SCR apparatuses is low To the reducing agent supply tank (210).

상기 환원제 공급펌프(220)의 출구측배관(221)은 상기 환원제 반송배관(240)과 연결되며, 본 발명에서는 상기 환원제 반송배관(240)의 직경을 상기 환원제 공급펌프(220)의 출구측배관(221)의 직경보다 상대적으로 크게 설정하는 기술을 제안한다. 상기 환원제 반송배관(240)의 직경을 크게 함으로써 고압 상태의 고유량의 환원제를 일시적으로 안정적으로 저장할 수 있게 되며 이를 통해 환원제 공급유량이 급격히 증가하는 경우에도 압력 저하 없이 환원제를 각 SCR 장치의 환원제 공급관(250)에 공급할 수 있게 된다. 환원제 반송배관(240)의 이와 같은 역할은 종래 기술의 축압기(accumulator)의 역할에 상응하다. The outlet pipe 221 of the reducing agent supply pump 220 is connected to the reducing agent delivery pipe 240 and the diameter of the reducing agent delivery pipe 240 is set to be smaller than the diameter of the reducing agent delivery pipe 240, Is set to be relatively larger than the diameter of the outer cylinder 221. By increasing the diameter of the reducing agent delivery pipe 240, it is possible to temporarily store the reducing agent at a high flow rate in a high-pressure state stably, and even when the flow rate of the reducing agent is rapidly increased through the reducing agent feed pipe 240, (Not shown). This role of the reducing agent return pipe 240 corresponds to the role of a prior art accumulator.

상기 환원제 반송배관(240)의 직경은 상기 환원제 공급펌프(220) 출구측배관(221)의 직경에 대비하여 1.5배 정도 커야하며, 1.5배 이하에서는 축압기의 역할 즉, 고압 및 고유량의 저장 역할을 기대할 수 없다. 또한, 공간 활용 측면에서 5배 이상은 바람직하지 않다. 따라서, 환원제 반송배관(240)의 직경은 상기 환원제 공급펌프(220) 출구측배관(221)의 직경에 대비하여 1.5∼5배 정도로 설계하는 것이 바람직하다. The diameter of the reducing agent transfer pipe 240 should be about 1.5 times as large as the diameter of the pipe 221 at the outlet side of the reducing agent supply pump 220. If the diameter of the reducing agent transfer pipe 240 is less than 1.5 times, I can not expect a role. In terms of space utilization, it is not preferable to be 5 times or more. Therefore, it is preferable that the diameter of the reducing agent return pipe 240 is designed to be about 1.5 to 5 times the diameter of the outlet side pipe 221 of the reducing agent supply pump 220.

상기 환원제 반송배관(240)에는 각 SCR 장치의 환원제 공급관(250)으로의 환원제 공급, 차단 및 환원제 공급탱크(210)로의 반송, 차단을 위해 밸브 장치들이 구비될 수 있다.
Valve devices may be provided in the reducing agent delivery pipe 240 for supplying and shutting off the reducing agent to the reducing agent supply pipe 250 of each SCR device, and for transferring and shutting off the reducing agent to the reducing agent supply tank 210.

210 : 환원제 공급탱크 220 : 환원제 공급펌프
221 : 환원제 공급펌프 출구측배관 230 : 환원제 공급배관
240 : 환원제 반송배관 250 : 환원제 공급관210: Reducing agent supply tank 220: Reducing agent supply pump
221: Reducing agent supply pump outlet side piping 230: Reducing agent supply piping
240: Reducing agent return pipe 250: Reducing agent supply pipe

Claims (2)

환원제를 저장하는 환원제 공급탱크;
상기 환원제 공급탱크에 저장되어 있는 환원제를 펌핑하는 환원제 공급펌프; 및
상기 환원제 공급펌프에 의해 펌핑된 환원제를 각 SCR 장치의 환원제 공급관에 공급함과 함께 미공급 환원제를 상기 환원제 공급탱크에 반송시키는 환원제 반송배관을 포함하여 이루어지며,
상기 환원제 반송배관의 직경은 상기 환원제 공급펌프의 출구측배관의 직경보다 상대적으로 큰 것을 특징으로 하는 SCR 장치의 환원제 공급장치.
A reducing agent supply tank for storing a reducing agent;
A reducing agent supply pump for pumping the reducing agent stored in the reducing agent supply tank; And
And a reducing agent transfer pipe for supplying the reducing agent pumped by the reducing agent supply pump to the reducing agent supply pipe of each SCR apparatus and returning the unrefined reducing agent to the reducing agent supply tank,
And the diameter of the reducing agent delivery pipe is relatively larger than the diameter of the outlet side pipe of the reducing agent supply pump.
제 1 항에 있어서, 상기 환원제 반송배관의 직경은 상기 환원제 공급펌프의 출구측배관의 직경에 대비하여 1.5∼5배인 것을 특징으로 하는 SCR 장치의 환원제 공급장치. The reducing agent supply device of claim 1, wherein the diameter of the reducing agent delivery pipe is 1.5 to 5 times the diameter of the outlet side pipe of the reducing agent supply pump.
KR1020130045141A 2013-04-24 2013-04-24 UREA supply unit of Selective Catalyst Reduction system KR20140126898A (en)

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