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KR20200006413A - Burner of SCR system - Google Patents

Burner of SCR system Download PDF

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Publication number
KR20200006413A
KR20200006413A KR1020180080124A KR20180080124A KR20200006413A KR 20200006413 A KR20200006413 A KR 20200006413A KR 1020180080124 A KR1020180080124 A KR 1020180080124A KR 20180080124 A KR20180080124 A KR 20180080124A KR 20200006413 A KR20200006413 A KR 20200006413A
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KR
South Korea
Prior art keywords
burner
exhaust gas
burner nozzle
nozzle set
combustion air
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KR1020180080124A
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Korean (ko)
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권영우
김건호
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현대중공업 주식회사
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Priority to KR1020180080124A priority Critical patent/KR20200006413A/en
Publication of KR20200006413A publication Critical patent/KR20200006413A/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
    • F01N3/18—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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • 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
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F01N3/225—Electric control of additional air supply
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N2240/14—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 a fuel burner
    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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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

The present invention relates to a burner for heating exhaust gas in an SCR system to remove nitrogen oxides contained in the exhaust gas through a catalytic reaction. In particular, the present invention can improve the performance of the burner by directly injecting combustion air into the burner, and control overheating by increasing the amount of the combustion air. To this end, according to the present invention, the burner of the SCR system for heating of the exhaust gas comprises: a burner nozzle set for heating the exhaust gas; an oil skid supplying oil to the burner nozzle set; a blower supplying the combustion air to the burner nozzle set; and a control valve which controls the amount of the combustion air supplied from the blower to the burner nozzle set by comparing the exhaust gas temperature at a front end of the burner nozzle set with the temperature of the exhaust gas at a rear end of the burner nozzle set.

Description

SCR시스템의 버너{Burner of SCR system}Burner of SCR system {Burner of SCR system}

본 발명은 촉매 반응을 통해 배기가스에 포함된 질소산화물을 제거하는 SCR시스템에서 배기가스를 가열하기 위한 버너에 관한 것으로서, 특히 버너에 연소공기를 직접 주입할 수 있게 구성하여 버너의 성능을 향상시키며 더불어 과열 시에 연소공기량의 증대시켜 제어할 수 있도록 구성한 것이다.The present invention relates to a burner for heating exhaust gas in an SCR system that removes nitrogen oxides contained in exhaust gas through a catalytic reaction, and in particular, it is possible to directly inject combustion air into the burner to improve the performance of the burner. In addition, it is configured to increase and control the amount of combustion air during overheating.

일반적으로 선박에는 선박을 추진시키기 위해 프로펠러를 구동하는 메인 엔진, 그리고 선박에 탑재된 각종 장비나 의장품 등에 전원을 공급하기 위한 다수의 발전용 엔진 등이 설치되어 운영되고 있다.In general, a ship is installed with a main engine driving a propeller to propel a ship, and a number of power generation engines for supplying power to various equipment or equipment mounted on the ship.

이러한 선박 엔진에서 연소 후 배출되는 배기가스에는 다수의 부유성 미립자와 질소산화물인 NOx, 황산화물인 SOx 등의 유해성 물질이 포함되어 있다.Exhaust gases emitted after combustion in such ship engines contain a number of suspended particulates and harmful substances such as nitrogen oxides (NOx) and sulfur oxides (SOx).

따라서 엔진의 배기라인에는 매연 여과 장치(DPF: Diesel Particulate Filter), 선택적 촉매 환원 장치(SCR: Selective Catalytic Reduction), 스크러버(SCRubber, SOx 제거) 등을 설치하여 배기가스 내의 유해 성분을 제거하고 있다.Therefore, the exhaust line of the engine is equipped with a diesel particulate filter (DPF), a selective catalytic reduction (SCR), and a scrubber (SCRubber, SOx removal) to remove harmful components in the exhaust gas.

이 중 LP SCR시스템은 내부 촉매층을 갖고 배기라인 상에 설치되는 SCR반응기를 포함하며, 배기가스 내의 질소산화물(NOx)을 촉매층에서 암모니아(NH3), 우레아(Urea) 등의 환원제와 화학적으로 반응시켜 인체에 무해한 물과 질소로 분해한 후 배출시킨다. 여기에서 우레아는 열분해 또는 가수분해되어 암모니아(NH3)로 변환된다.Among them, the LP SCR system includes an SCR reactor having an internal catalyst layer and installed on an exhaust line, and chemically reacts nitrogen oxides (NOx) in the exhaust gas with a reducing agent such as ammonia (NH3) and urea (Urea) in the catalyst layer. Decompose it with water and nitrogen, which is harmless to the human body and discharge it. Urea is pyrolyzed or hydrolyzed and converted to ammonia (NH3).

그리고 SCR 촉매(Catalyst)는 압출 또는 코팅이 형성된 다공질 촉매 필터로 이루어진 것으로서, 배기라인에 설치된 SCR반응기 내에 한 개 또는 두 개가 연속 설치되어 배기가스 내의 유해성분을 제거하게 된다.In addition, the SCR catalyst (Catalyst) is composed of a porous catalyst filter formed by extrusion or coating, one or two consecutively installed in the SCR reactor installed in the exhaust line to remove harmful components in the exhaust gas.

기존의 대형엔진용 SCR시스템은 ABS(Ammonium Bisulfate:NH4HSO4) 생성 방지, 분해 및 NOx 제거를 위하여 연료 중 황 함량에 따라 250℃ 이상의 고온이 필요함에 따라 엔진 튜닝을 통해 배기가스 온도를 높이거나, 배기가스 온도가 250~500℃인 엔진 T/C(Turbo Charger) 전단에 설치된다.Existing SCR systems for large engines require high temperatures of 250 ° C or higher, depending on the sulfur content in the fuel, to prevent the generation of ABS (Ammonium Bisulfate: NH4HSO4) and to remove NOx. It is installed in front of the engine charger (T / C) whose gas temperature is 250 ~ 500 ℃.

이와 같이 SCR시스템이 T/C 전단에 설치되는 경우 SCR시스템으로 유입되는 배기가스의 압력이 높기 때문에 HP SCR(High Pressure Selective Catalytic Reduction)시스템이라 불린다.As such, when the SCR system is installed at the front end of the T / C, since the pressure of the exhaust gas flowing into the SCR system is high, it is called an HP High Pressure Selective Catalytic Reduction (SCR) system.

그러나 SCR시스템을 T/C 전단에 설치하게 되면, 협소한 엔진룸으로 인하여 SCR시스템의 배치에 어려움이 있다.However, when the SCR system is installed at the front end of the T / C, it is difficult to arrange the SCR system due to the narrow engine room.

이러한 문제점을 해결하기 위해 배기가스 온도가 150~300℃ 이며, 압력은 대기압 수준인 T/C 후단에 SCR시스템을 설치할 수 있다.In order to solve this problem, the exhaust gas temperature is 150 ~ 300 ℃, the pressure can be installed in the SCR system after the T / C at the atmospheric pressure level.

SCR시스템을 T/C 후단에 설치하게 되면, 엔진룸 외부에 SCR시스템을 설치할 수 있게 됨에 따라 SCR시스템을 공간 제약 없이 자유로이 배치할 수 있게 된다. 이러한 시스템 구성을 LP SCR(Low Pressure Selective Catalytic Reduction)시스템이라고 한다.If the SCR system is installed at the rear of the T / C, the SCR system can be installed outside the engine room, and thus the SCR system can be freely placed without any space limitation. This system configuration is called Low Pressure Selective Catalytic Reduction (LP SCR) system.

도면에서, 도 1은 종래 기술에 따른 LP SCR시스템을 나타낸 개념도이다.1 is a conceptual diagram showing an LP SCR system according to the prior art.

도 1에 도시된 바와 같이, 엔진(10)에서 발생한 배기가스는 배기가스 리시버(20)로 유입된 후 T/C(30)를 지나 대기 중으로 배기된다.As shown in FIG. 1, the exhaust gas generated from the engine 10 is introduced into the exhaust gas receiver 20 and then exhausted through the T / C 30 to the atmosphere.

배기가스의 유해 질소산화물(NOx)을 제거하기 위해서는, 우선 SCR반응기(80) 내부의 ABS를 제거하여야 한다. 이를 위해 배기라인(1)의 배기가스를 블로워(40)로 흡입하여 SCR반응기(80)로 유동시키는데, 블로워(40)를 통해 흡입된 배기가스는 ABS를 제거할 수 있는 온도 약 300~450℃에 미치지 못하므로 버너(50)를 통해 배기가스를 가열한다. 가열된 배기가스는 우레아 분해 챔버(60), 가스혼합기(70)를 지나 SCR반응기(80)로 유입된 후 대기로 배출되는데, 촉매반응을 방해하는 ABS는 가열된 배기가스의 온도에 의해 기화되어 제거된다.In order to remove harmful nitrogen oxides (NOx) in the exhaust gas, it is necessary to first remove the ABS inside the SCR reactor 80. To this end, the exhaust gas of the exhaust line 1 is sucked into the blower 40 and flows to the SCR reactor 80. The exhaust gas sucked through the blower 40 is about 300 to 450 ° C. at which the ABS can be removed. Since it does not reach the heat exhaust gas through the burner (50). The heated exhaust gas enters the SCR reactor 80 after passing through the urea decomposition chamber 60 and the gas mixer 70 and is discharged to the atmosphere. The ABS which prevents the catalytic reaction is vaporized by the temperature of the heated exhaust gas. Removed.

이후 LP SCR시스템이 정상적으로 작동하면서, 배기가스에 포함된 유해 질소산화물을 암모니아(NH3), 우레아(Urea) 등의 환원제와 화학적으로 촉매층에서 반응시켜 인체에 무해한 물과 질소로 분해한 후 배출시킨다. 여기에서 우레아는 열분해 또는 가수분해되어 암모니아(NH3)로 변환되며 가수분해를 위해서는 별도의 버너가 필요하다.Since the LP SCR system is operating normally, the harmful nitrogen oxide contained in the exhaust gas is chemically reacted with a reducing agent such as ammonia (NH 3) and urea (Urea) in the catalyst layer to be decomposed into water and nitrogen, which are harmless to the human body, and then discharged. Here urea is pyrolyzed or hydrolyzed and converted to ammonia (NH3) and a separate burner is required for hydrolysis.

또한 LP SCR시스템은 T/C(30)의 후단에 설치됨에 따라 배기가스의 온도가 약 200~260℃이하이며, 이로 인해 SCR반응기(80) 내부의 ABS를 제거하기 위해서 배기가스의 가열을 위해 별도로 버너(50)가 필요하다.In addition, since the LP SCR system is installed at the rear end of the T / C 30, the temperature of the exhaust gas is about 200 to 260 ° C. or less, and thus, for heating the exhaust gas to remove the ABS inside the SCR reactor 80. Burner 50 is required separately.

선박에 사용되는 연료는 ISO8217에 규정되어 있으며, 특히 각 유종별의 점성 특성에 따라 버너 노즐에서 분사되는 오일 미스트(oil mist)의 성능을 만족시키기 위해 오일 소모량 범위(Turndown ratio)가 1:5의 비율을 넘지 않도록 규정되고 있다.The fuel used for ships is specified in ISO8217, and the oil down ratio is 1: 5 in order to satisfy the performance of oil mist injected from the burner nozzle, in particular according to the viscosity characteristics of each oil type. It is prescribed not to exceed ratio.

여기에서 1:5의 비율이란, 최소 오일 사용량 대 최대 오일 사용량의 비율로서, 종래의 SCR용 버너 노즐을 선택함에 있어 제한 조건이 되고 있다.Here, the ratio of 1: 5 is the ratio of the minimum oil usage to the maximum oil usage, which is a limiting condition in selecting a conventional burner nozzle for SCR.

하지만, SCR용 버너의 운전 조건은 10~100%의 범위에서 운전된다. 이는 선박 엔진의 다양한 운전범위와 더불어 대기 온도조건 및 엔진 성능특성 등에 따라 버너의 운전 조건도 더 넓어질 수밖에 없으며, 이에 따라 SCR시스템에 사용되는 SCR용 버너의 오일 소모량 범위(Turndown ratio)가 1:7 이상의 비율까지 요구되고 있다.However, the operating conditions of the burner for SCR are operated in the range of 10 to 100%. In addition to the various operating ranges of the ship engine, the operating conditions of the burner can be widened according to the atmospheric temperature conditions and engine performance characteristics, and accordingly, the oil down ratio of the burner for SCR used in the SCR system is 1: A ratio of up to 7 is required.

따라서 종래에는 오일 소모량 범위가 1:5의 버너 노즐을 배기관에 복수 대 설치하여 요구되는 오일 소모량 범위인 1:7 이상의 비율을 맞추도록 구성하고 있다.Therefore, in the related art, a plurality of burner nozzles having an oil consumption range of 1: 5 are provided in the exhaust pipe so as to meet a ratio of 1: 7 or more, which is a required oil consumption range.

도 2는 배기관의 상부와 하부에 각각 장착된 버너 노즐들을 나타낸 개통도이다.Figure 2 is an opening diagram showing the burner nozzles respectively mounted on the upper and lower portions of the exhaust pipe.

배기관(1)을 따라 유동하는 배기가스의 온도를 증가시키기 위해 배기관(1)에는 복수의 버너 노즐 세트(90)가 장착된다. 도 2에서는 배기관(1)을 중심으로 양측에 각각 버너 노즐 세트(90)가 장착된 것을 도시한 것이다.In order to increase the temperature of the exhaust gas flowing along the exhaust pipe 1, the exhaust pipe 1 is equipped with a plurality of burner nozzle sets 90. In FIG. 2, burner nozzle sets 90 are mounted on both sides of the exhaust pipe 1, respectively.

각 버너 노즐 세트(90)의 버너 노즐(91P, 91M)들은 오일 스키드(oil skid)(93)에서 공급되는 오일을 배기관(1) 내부로 오일 미스트 형태로 공급한다.Burner nozzles 91P and 91M of each burner nozzle set 90 supply oil supplied from an oil skid 93 into the exhaust pipe 1 in the form of an oil mist.

앞서 설명한 바와 같이 버너 노즐(91P, 91M)에 따라 요구되는 오일 분무 성능을 만족시키는 오일 소모량 범위(Turndown) 내에서 설정된 배기가스의 온도까지 상승시키기 위해 복수 세트의 버너 노즐들이 설치된다.As described above, a plurality of burner nozzles are installed to raise the temperature of the exhaust gas set within the oil consumption range (Turndown) satisfying the required oil spraying performance according to the burner nozzles 91P and 91M.

한편, 도 2에 보이듯이 오일 연소에 필요한 연소공기는 압입 송풍기(FD FAN : Forced Draft Fan)(95)에 의해 배기관(1)의 내부로 공급된다.Meanwhile, as shown in FIG. 2, combustion air necessary for oil combustion is supplied into the exhaust pipe 1 by a forced draft fan (FD FAN) 95.

종래에는 오일 소모량의 범위가 1:5의 비율인 복수의 버너 노즐 세트(90)를 배기관(1)에 장착함에 따라 구조가 복잡하고, 제반 보기장치의 구성 또한 복잡하게 되는 단점이 있다. Conventionally, the structure is complicated by mounting a plurality of burner nozzle sets 90 having a ratio of oil consumption in a ratio of 1: 5 to the exhaust pipe 1, and the configuration of the viewing device is also complicated.

또한, 버너를 통과한 배기가스의 온도가 설정 온도 이상일 경우에는 버너에서 배기가스에 가하는 열량을 감소시켜 배기가스의 온도를 낮추어야 하는데 이와 같은 시스템의 온도 제어 방식은 반응속도가 느리다는 단점이 있다.In addition, when the temperature of the exhaust gas passing through the burner is higher than the set temperature, the amount of heat applied to the exhaust gas in the burner should be reduced to lower the temperature of the exhaust gas. However, the temperature control method of such a system has a disadvantage in that the reaction speed is slow.

대한민국 공개특허공보 제10-2014-0142737호 (2014.12.12)Republic of Korea Patent Publication No. 10-2014-0142737 (2014.12.12)

본 발명은 앞에서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 발명된 것으로서, 높은 오일 소모량 범위를 갖는 단독의 버너 노즐 세트를 배기관에 장착하고 배기가스의 온도 제어를 연소 공기의 양으로 제어함으로써, 구성이 단순하며 제어가 용이하도록 구성한 SCR용 버너를 제공하는 데 그 목적이 있다.The present invention has been invented to solve the problems of the prior art as described above, by mounting a single burner nozzle set having a high oil consumption range to the exhaust pipe and controlling the temperature control of the exhaust gas by the amount of combustion air An object of the present invention is to provide a burner for the SCR which is configured to be simple and easy to control.

상기와 같은 목적을 달성하기 위한 본 발명은 배기가스의 가열을 위한 SCR시스템의 버너로서, 배기가스를 가열하기 위한 버너 노즐 세트와, 버너 노즐 세트에 오일을 공급하는 오일 스키드와, 버너 노즐 세트에 연소공기를 공급하는 송풍기와, 버너 노즐 세트의 전단의 배기가스 온도와 버너 노즐 세트의 후단의 배기가스의 온도를 비교하여 송풍기에서 버너 노즐 세트로 공급되는 연소공기의 양을 제어하는 컨트롤 밸브를 포함하는 것을 기술적 특징으로 한다.The present invention for achieving the above object is a burner of the SCR system for heating the exhaust gas, a burner nozzle set for heating the exhaust gas, an oil skid for supplying oil to the burner nozzle set, burner nozzle set A blower for supplying combustion air and a control valve for controlling the amount of combustion air supplied from the blower to the burner nozzle set by comparing the exhaust gas temperature at the front of the burner nozzle set with the temperature of the exhaust gas at the rear end of the burner nozzle set. It is a technical feature to do.

또한, 본 발명의 바람직한 실시예에 따르면, 버너 노즐 세트는 점화를 위해 공급되는 연료를 연소시키는 파일럿 버너 노즐과, 배기가스에 열을 가하는 메인 버너 노즐을 포함한다.Further, according to a preferred embodiment of the present invention, the burner nozzle set includes a pilot burner nozzle for burning fuel supplied for ignition, and a main burner nozzle for applying heat to exhaust gas.

앞서 설명한 바와 같이, 본 발명에 따른 SCR시스템의 버너는 한 세트의 버너 노즐을 배기관에 설치함으로써, 종래와 같이 오일 소모량 범위가 낮은 버너 노즐을 배기관에 복수 세트 설치하는 것 보다 구조적으로 간단하게 구성하고 있다.As described above, the burner of the SCR system according to the present invention has a structure that is simpler than installing a plurality of burner nozzles having a low oil consumption range in the exhaust pipe by installing a set of burner nozzles in the exhaust pipe. have.

또한, 본 발명에 버너를 통과한 배기가스의 온도가 설정온도보다 높을 경우 연소공기의 양으로 배기가스의 온도를 제어함으로써 배기가스의 온도 제어가 용이하며 신속하다는 장점이 있다.In addition, when the temperature of the exhaust gas passing through the burner is higher than the set temperature in the present invention, by controlling the temperature of the exhaust gas by the amount of combustion air, it is easy and quick to control the temperature of the exhaust gas.

도 1은 종래 기술에 따른 LP SCR시스템을 나타낸 개념도이고,
도 2는 배기관의 상부와 하부에 각각 장착된 버너 노즐들을 나타낸 개통도이다.
도 3은 본 발명에 따른 SCR용 버너의 설치 상태를 나타낸 개념도이다.1 is a conceptual diagram showing an LP SCR system according to the prior art,
2 is an opening diagram showing burner nozzles respectively mounted on the upper and lower portions of the exhaust pipe.
3 is a conceptual diagram showing an installation state of the burner for SCR according to the present invention.

아래에서는 본 발명에 따른 SCR시스템의 버너의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the burner of the SCR system according to the present invention will be described in detail.

도면에서, 도 3은 본 발명에 따른 SCR용 버너의 설치 상태를 나타낸 개념도이다.3 is a conceptual diagram showing an installation state of the burner for SCR according to the present invention.

도 3에 도시된 바와 같이, 배기관(1)에는 SCR용 버너 노즐 세트(110)가 장착되며, 오일 스키드(oil skid)(120)에서 버너 노즐(110P, 110M)로 연장된 오일 라인(121)을 통해 오일이 버너 노즐(110P, 110M)로 공급된다.As shown in FIG. 3, the exhaust pipe 1 is equipped with a burner nozzle set 110 for SCR, and an oil line 121 extending from the oil skid 120 to the burner nozzles 110P and 110M. Oil is supplied to the burner nozzles (110P, 110M) through.

또한 압입 송풍기(FD FAN : Forced Draft Fan)(130)에서 버너 노즐 세트(110) 쪽으로 연장된 연소공기 공급라인(131)을 통해 연료의 연소에 필요한 공기를 공급하며 연소공기 공급라인(131)에는 컨트롤 밸브(131V)가 장착되어 버너 노즐 세트(110)로 공급되는 공기의 양을 제어하도록 구성된다.In addition, the air supply for the combustion of fuel is supplied through the combustion air supply line 131 extending from the pressurized blower (FD FAN: Forced Draft Fan) 130 to the burner nozzle set 110, and the combustion air supply line 131 A control valve 131V is mounted and configured to control the amount of air supplied to the burner nozzle set 110.

그리고 배기가스가 배기관(1)을 따라 버너 노즐 세트(110)로 유입됨에 있어 버너 노즐 세트(110)로 유입되는 배기가스의 온도를 측정할 수 있는 온도 센서(141F)가 배기관(1)에 장착되며, 버너 노즐 세트(110)의 후단에 설치된 온도 센서(141B)에서는 버너에 의해 가열된 배기가스의 온도를 측정한다. In addition, since the exhaust gas flows into the burner nozzle set 110 along the exhaust pipe 1, a temperature sensor 141F for measuring the temperature of the exhaust gas flowing into the burner nozzle set 110 is mounted to the exhaust pipe 1. The temperature sensor 141B installed at the rear end of the burner nozzle set 110 measures the temperature of the exhaust gas heated by the burner.

버너 노즐 세트(110)의 전단과 후단에 설치된 온도 센서(141F, 141B)에서 측정된 배기가스의 온도 정보를 통해 컨트롤 밸브(131V)의 개도가 조절되어 버너 노즐 세트(110)로 유입되는 공기의 양을 조절한다.The opening degree of the control valve 131V is adjusted through the temperature information of the exhaust gases measured by the temperature sensors 141F and 141B installed at the front and rear ends of the burner nozzle set 110 to control the flow of air flowing into the burner nozzle set 110. Adjust the amount.

더불어 오일 라인(121)에도 컨트롤 밸브(121V)가 장착되어 오일 공급량을 제어한다.In addition, a control valve 121V is mounted on the oil line 121 to control the oil supply amount.

이와 같이 구성된 SCR용 버너에 있어서, 버너 노즐 세트(110)는 파일럿 버너 노즐(110P)과 메인 버너 노즐(110M) 및 압입 송풍기(130)를 포함하며, 파일럿 버너 노즐(110P)은 점화의 목적으로 지속적으로 공급되는 연료를 연소시키고 있는 버너로서, 최소량의 연료를 공급하도록 설계된다. 그리고 메인 버너 노즐(110M)은 SCR시스템의 작동 시에 요구되는 온도를 맞추기 위해 배기가스에 열을 가하는 버너이고, 압입 송풍기(130)는 메인 버너 노즐(110M)의 운전 시에 연소에 필요한 최소의 연소공기를 주입한다.In the burner for SCR configured as described above, the burner nozzle set 110 includes a pilot burner nozzle 110P, a main burner nozzle 110M, and a press-fit blower 130, and the pilot burner nozzle 110P is used for ignition purposes. A burner that burns fuel continuously, designed to supply the least amount of fuel. In addition, the main burner nozzle 110M is a burner that heats exhaust gas to adjust the temperature required for the operation of the SCR system, and the press-in blower 130 is the minimum required for combustion during operation of the main burner nozzle 110M. Inject combustion air.

이와 같이 구성된 버너 노즐 세트(110)는 배기관(1)에 장착되며, 앞서 설명한 오일 스키드(120)에서 오일이 공급되고, 압입 송풍기(130)의 운전에 의해 연소공기가 메인 버너 노즐(110M)로 공급되며 연소공기의 공급량은 컨트롤 밸브(131V)로 제어된다.The burner nozzle set 110 configured as described above is mounted on the exhaust pipe 1, oil is supplied from the oil skid 120 described above, and combustion air is supplied to the main burner nozzle 110M by the operation of the press-fit blower 130. It is supplied and the supply amount of combustion air is controlled by the control valve 131V.

따라서 버너 노즐 세트(110)의 전단과 후단에 설치된 온도센서(141F, 141B)를 통해 배기가스의 온도를 모니터링한 상태에서 메인 버너 노즐(110M)로 공급되는 공기의 양을 컨트롤 밸브(131V)를 통해 조정함으로써, 파일럿 버너 노즐(110P) 및 메인 버너 노즐(110M)에 공급되는 오일 주입조건에서 대기의 약 25도 내외의 공기를 탄력적으로 공급할 수 있게 되고, 이와 같이 연소공기의 양을 배기가스의 온도에 따라 탄력적으로 제어하여 공급함에 따라 오일 소모량 범위(Turndown)가 1:5인 버너 노즐 세트로 1:7 내지 1:10의 기능을 갖는 버너 노즐 세트(110)의 구현이 가능하게 된다.Therefore, the control valve 131V controls the amount of air supplied to the main burner nozzle 110M while the temperature of the exhaust gas is monitored through the temperature sensors 141F and 141B installed at the front and rear ends of the burner nozzle set 110. By adjusting through this, it is possible to elastically supply air of about 25 degrees to the atmosphere under the oil injection conditions supplied to the pilot burner nozzle 110P and the main burner nozzle 110M, and thus the amount of combustion air By controlling and supplying elastically according to temperature, it is possible to implement a burner nozzle set 110 having a function of 1: 7 to 1:10 as a burner nozzle set having an oil consumption range (Turndown) of 1: 5.

따라서 모니터링된 온도 정보에 맞춰 버너 노즐 세트(110)의 메인 버너 노즐(110M)로 공급되는 연소공기의 양을 실시간으로 제어함에 따라 종래의 동일한 사양의 버너 노즐 세트로 그 성능이 증대되어 1:7 내지 1:10의 오일 소모량 범위를 갖는 버너 노즐 세트를 구현할 수 있다. Therefore, by controlling the amount of combustion air supplied to the main burner nozzle 110M of the burner nozzle set 110 according to the monitored temperature information in real time, its performance is increased to a burner nozzle set having the same specification as the conventional 1: 7. A burner nozzle set having an oil consumption range of 1 to 1:10 may be implemented.

즉 종래에는 1:7의 오일 소모량 범위를 맞추기 위해 배기관에 복수의 버너 노즐 세트(도 2의 90)를 설치하였으나, 본원 발명에서는 단독의 버너 노즐 세트(110)로도 1:7 내지 1:10의 오일 소모량 범위를 구현 가능하다.That is, although a plurality of burner nozzle sets (90 of FIG. 2) are conventionally installed in the exhaust pipe to match the oil consumption range of 1: 7, in the present invention, the burner nozzle sets 110 of the invention are also 1: 7 to 1:10. The oil consumption range can be realized.

또한 추가적인 안전사항으로 버너 노즐 세트(110)의 후단에서 감지된 배기가스의 온도가 설계기준값 보다 높게 감지될 경우, 압입 송풍기(130)로부터 연소공기를 최대로 유입시키고 더불어 오일 주입량을 최소로 조정하도록 구성하여 어떠한 조건에서도 설계 상한치의 온도에 도달하지 않는 안전한 조건을 구현할 수 있다.In addition, as an additional safety measure, when the temperature of the exhaust gas detected at the rear end of the burner nozzle set 110 is detected to be higher than the design reference value, the combustion air may be introduced from the press-fit blower 130 to the maximum and the oil injection amount may be adjusted to the minimum. By configuring it, it is possible to realize safe conditions that do not reach the upper limit of the design temperature under any conditions.

1 : 배기관
110 : 버너 노즐 세트
110P : 파일럿 버너 노즐
110M : 메인 버너 노즐
120 : 오일 스키드
121 : 오일 라인
121V, 131V : 컨트롤 밸브
130 : 압입 송풍기
131 : 연소공기 공급라인
141F, 141B : 온도센서1: exhaust pipe
110: burner nozzle set
110P: Pilot Burner Nozzle
110M: Main Burner Nozzle
120: oil skid
121: oil line
121V, 131V: Control Valve
130: press blower
131: combustion air supply line
141F, 141B: Temperature Sensor

Claims (2)

배기가스의 가열을 위한 SCR시스템의 버너로서,
배기가스를 가열하기 위한 버너 노즐 세트와,
버너 노즐 세트에 오일을 공급하는 오일 스키드와,
버너 노즐 세트에 연소공기를 공급하는 송풍기와,
버너 노즐 세트의 전단의 배기가스 온도와 버너 노즐 세트의 후단의 배기가스의 온도를 비교하여 송풍기에서 버너 노즐 세트로 공급되는 연소공기의 양을 제어하는 컨트롤 밸브를 포함하는 것을 특징으로 하는 SCR시스템의 버너.
As burner of SCR system for heating exhaust gas,
A burner nozzle set for heating exhaust gas,
An oil skid that supplies oil to the burner nozzle set,
A blower that supplies combustion air to the burner nozzle set,
And a control valve for controlling the amount of combustion air supplied from the blower to the burner nozzle set by comparing the exhaust gas temperature at the front end of the burner nozzle set with the exhaust gas temperature at the rear end of the burner nozzle set. burner.
제1항에 있어서,
버너 노즐 세트는 점화를 위해 공급되는 연료를 연소시키는 파일럿 버너 노즐과, 배기가스에 열을 가하는 메인 버너 노즐을 포함하는 것을 특징으로 하는 SCR시스템의 버너.The method of claim 1,
The burner nozzle set includes a pilot burner nozzle for burning fuel supplied for ignition, and a main burner nozzle for heating exhaust gas.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140142737A (en) 2012-04-02 2014-12-12 파워페이즈 엘엘씨 Compressed air injection system method and apparatus for gas turbine engines

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