KR20020051068A - Method of flame stability using lobed burner - Google Patents

Method of flame stability using lobed burner Download PDF

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Publication number
KR20020051068A
KR20020051068A KR1020000080520A KR20000080520A KR20020051068A KR 20020051068 A KR20020051068 A KR 20020051068A KR 1020000080520 A KR1020000080520 A KR 1020000080520A KR 20000080520 A KR20000080520 A KR 20000080520A KR 20020051068 A KR20020051068 A KR 20020051068A
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KR
South Korea
Prior art keywords
injection port
burner
lobe
flame
fuel
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KR1020000080520A
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Korean (ko)
Inventor
조한창
이용국
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신현준
재단법인 포항산업과학연구원
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Priority to KR1020000080520A priority Critical patent/KR20020051068A/en
Publication of KR20020051068A publication Critical patent/KR20020051068A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/38—Nozzles; Cleaning devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/12—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour characterised by the shape or arrangement of the outlets from the nozzle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2209/00—Safety arrangements
    • F23D2209/20—Flame lift-off / stability

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Abstract

PURPOSE: A method for stabilizing the flame is provided to improve the stability of the flame by forming a fuel injection port and an oxidizer injection port with a lobe shape. CONSTITUTION: A fuel injection port(11) is formed at one side of a burner body(10). An oxidizer injection port(12) is formed at an outer side of the fuel injection port(11). The oxidizer injection port(12) and the fuel injection port(11) have a lobe shape by forming a triangle or rectangular shaped tap in a circumferential direction thereof. Accordingly, fuel is supplied from a center of the oxidizer injection port(12) and the fuel injection port(11) and oxidizer is supplied from a peripheral portion of the oxidizer injection port(12) and the fuel injection port(11), thereby improving the mixing degree between fuel and oxidizer. The lobe structure generates an azimuthal vortex, thereby improving the mixing ability of a nozzle.

Description

로브형 버너를 이용한 화염안정화 방법{Method of flame stability using lobed burner}Flame stabilization method using lobed burner {Method of flame stability using lobed burner}

본 발명은 로브형 버너를 이용한 화염안정화 방법, 보다 상세하게는 버너에 구비되어 연료를 공급하는 연료분사구와 그 외측에 형성되어 연소를 촉진되게 산화제를 공급하는 산화제 분사구의 단면 구조를 동축상의 내외측에서 로브형태로 형성함으로써 화염안정성을 향상시킬 수 있게한 로브형 버너를 이용한 화염안정화 방법에 관한 것이다.The present invention provides a flame stabilization method using a lobe type burner, and more specifically, a cross-sectional structure of a fuel injection port provided at the burner to supply fuel and an oxidant injection port formed on the outside to supply an oxidant to promote combustion is coaxial inward and outward. The present invention relates to a flame stabilization method using a lobe type burner that can improve flame stability by forming in a lobe shape.

일반적으로, 기존의 버너에서 화염안정성의 향상을 위하여 여러가지 모양의 화염안정기(flame stabilizer)의 도입하고, 산화제를 선회유동(swirl flow)으로 공급하며, 산화제내 산소농도의 증대 및 산화제를 예열하여 공급하는 방법 등이 동원되었다.Generally, various types of flame stabilizers are introduced to improve flame stability in conventional burners, oxidants are supplied in a swirl flow, oxygen concentration in the oxidants is increased, and preheated oxidants are supplied. How to do it.

위와 같은 기존의 방법을 이용하여도 성공적으로 화염의 안정성을 증대시킬 수 있으나, 이들 조건을 충족시키기 위해서는 추가적인 화염안정기 부착, 선회기 부착, 산소공급배관 부착 및 예열기의 부착과 같은 버너부와 공급배관의 개조가 요구되는 등 그 여러가지 한계점이 있었다.Although the existing methods can be successfully used to increase the stability of the flame, burner parts and supply piping such as additional flame stabilizer, swirler attachment, oxygen supply pipe attachment and preheater attachment are required to meet these conditions. There were several limitations, including the need for modifications.

예컨데, 도 1a 및 1b는 종래의 분류층 가스화기의 버너를 나타낸 단면도와 그 노즐에 대한 평면구성도로서, 원형의 연료분사구(1) 주위에 연료의 냉각과 예비혼합을 위한 1차산화제 주입구(2)와 여러 개의 2차산화제 주입구(3)가 외측으로 형성된 구조로 되어 있으며, 이때 연소중 질소산화물의 배출저감을 위하여 2차산화제주입구 숫자와 직경을 변화시킴으로써 분사속도를 변화시키고 상기 각 주입구의 간격 변화에 의해 혼합특성을 변화시키게 된 것이다For example, FIGS. 1A and 1B are cross-sectional views showing a burner of a conventional fractionated bed gasifier and a planar view of the nozzle, and a primary oxidant inlet for cooling and premixing fuel around a circular fuel injection port 1. 2) and a plurality of secondary oxidant inlet (3) is formed to the outside, at this time to change the injection speed by changing the number and diameter of the secondary oxidant inlet to reduce the emission of nitrogen oxide during combustion and The mixing characteristics were changed by changing the interval.

그러나 상기 종래의 기술은 연소시설의 규모와 연료의 종류에 따라 서로 다른 결과가 도출될 수 있으므로 축열식 가열기에는 적용이 가능하였으나, 그 외의 다른 종류의 연소기기에는 적용될 수 없는 제약이 있었으며, 이러한 제약을 극복하기 위해서는 연소기의 목적과 연소부하에 따라 질소산화물의 배출량을 저감시킬 수 있는 버너를 새로 개발해야 되는 어려움이 대두되었다.However, the conventional technology may be applied to a regenerative heater because different results may be obtained depending on the size of the combustion facility and the type of fuel, but there are limitations that cannot be applied to other types of combustion devices. In order to overcome this problem, it is difficult to develop a new burner that can reduce nitrogen oxide emissions depending on the purpose and combustion load of the combustor.

본 발명은 위와 같은 종래의 버너의 문제점을 감안하여 안출한 것으로, 그 목적은 연료와 산화제의 혼합이 느려 화염안정성에 문제가 있는 연소장에 산화제와 연료출구를 로브(lobe) 형태로 형성하여 화염안정성을 향상시킬수 있는 로브형 버너를 이용한 화염안정화 방법을 제공하는 것이다.The present invention has been made in view of the problems of the conventional burner as described above, and its purpose is to slow down the mixing of fuel and oxidant to form a lobe of oxidant and fuel outlet in a combustion field having a problem of flame stability. It is to provide a flame stabilization method using a lobe-type burner that can improve the stability.

이러한 목적을 달성하기 위한 본 발명은, 버너몸체의 일측 단면에 형성된 연료분사구와 그 외측에 형성된 산화제 분사구를 삼각형 또는 사각형모양의 탭(tap)을 내거나 굴곡가공하여 원주방향을 향하는 로브형태로 형성함으로써, 연료와 산화제의 혼합을 촉진시켜 혼합 불량에 의한 화염 불안정성을 해소함과 아울러 일산화탄소와 매연(soot)을 저감시킬 수 있으며, 또한 기존의 화염안정화 방법과 달리 버너를 복잡하게 개조하지 않고 단순히 버너 출구만을 로브형태로 형성하여 화염길이를 증대시켜 화염의 세기를 저하시킬 수 있게 됨을 특징으로 한다.In order to achieve the above object, the present invention provides a fuel injection hole formed at one end surface of the burner body and an oxidant injection hole formed at the outside thereof by forming a triangular or square tap or bending to form a lobe facing in the circumferential direction. In addition, it promotes the mixing of fuel and oxidant to solve the flame instability caused by poor mixing, and to reduce carbon monoxide and soot.In addition, unlike the conventional flame stabilization method, it is possible to simply burn out the burner without complicated modification of the burner. Formed in the form of a lobe is characterized by being able to reduce the intensity of the flame by increasing the flame length.

도 1a 및 1b는 종래의 분류층 가스화기의 버너를 나타낸 단면도와 그 노즐에 대한 평면구성도,1A and 1B are a cross-sectional view showing a burner of a conventional fractionation layer gasifier and a planar configuration diagram of the nozzle thereof;

도 2a 및 2b는 본 발명의 로브형 버너의 분사구에 대한 일예와 다른 예를 나타낸 정면구성도,2a and 2b is a front configuration diagram showing an example and another example of the injection port of the lobed burner of the present invention,

도 3은 본 발명의 실시예에 따른 일산화탄소 배출량을 비교한 특성선도이다.3 is a characteristic diagram comparing carbon monoxide emissions according to an embodiment of the present invention.

< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>

10 : 버너몸체11 : 연료분사구10: burner body 11: fuel injection port

12 : 산화제 분사구12: oxidant nozzle

이하, 본 발명의 로브형 버너를 이용한 화염안정화 방법을 첨부도면을 참조하여 설명하면 다음과 같다.Hereinafter, the flame stabilization method using the lobe-type burner of the present invention will be described with reference to the accompanying drawings.

도 2a 및 2b는 본 발명의 로브형 버너의 분사구에 대한 일예와 다른 예를 나타낸 정면구성도로서, 버너몸체(10)의 일측 단면에 형성된 연료분사구(11)와 그 외측에 형성된 산화제 분사구(12)를 기존의 원형 대신 삼각형 또는 사각형모양의 탭(tap)을 내거나 굴곡가공하여 원주방향을 향하여 로브형태로 형성함으로써 각 로브형 분사구(11)(12)의 중심부에서 연료를, 그 주위에서 산화제를 공급하여 연료와 산화제의 혼합을 향상시키고자 하는 것이다.2a and 2b is a front configuration diagram showing an example and another example of the injection port of the lobe-type burner of the present invention, the fuel injection port 11 formed in one end surface of the burner body 10 and the oxidant injection port 12 formed on the outside thereof ) In the shape of a lobe toward the circumferential direction by tapping or bending a tab or a rectangular tap instead of a conventional circle, thereby producing fuel at the center of each lobe nozzle 11 and 12 and oxidizing agent around it. To improve the mixing of fuel and oxidant.

이러한 분류(jet)내 로브구조는 강한 축방향 와류(streamwise vorticity)로 3차원의 원주방향 와류(azimuthal vortex)를 발생시키기 때문에 일반 원형노즐에 비하여 혼합이 촉진된다.The lobe structure in the jet produces a three-dimensional circumferential vortex with strong streamwise vorticity, which promotes mixing compared to a general circular nozzle.

연료분사구(11)가 원형이고 산화제 분사구(12)의 벽면이 로브형으로 된 경우에 비해 상기 연료분사구와 산화제 분사구의 벽면이 동시에 로브형으로 된 경우에 화염안정성을 보다 향상시킬 수 있다(도 2b참조).Compared to the case where the fuel injection port 11 is circular and the wall surface of the oxidant injection port 12 is lobe-type, the flame stability can be further improved when the wall surfaces of the fuel injection port and the oxidant injection port are lobe-like (FIG. 2B). Reference).

버너에 채택되는 로브구조는 기본적으로 여러 개의 뿔구조를 갖고 있어야 한다. 많은 뿔구조는 연료와 공기의 혼합에 다소 유리하지만, 너무 많은 뿔구조는 제작상의 어려움에 따라 5개 이하로 한정하는 것이 좋다.The lobe structure adopted in the burner should basically have several horn structures. Many horn structures are somewhat advantageous for the mix of fuel and air, but too many horn structures should be limited to five or less depending on manufacturing difficulties.

로브형 버너의 길이는 연료분사구 전체를 로브형으로 제작하면 좋으나 제작상의 어려움과 제작경비의 과다등으로 직경에 30배정도의 길이만 갖고 있으면 충분하다고 판단된다.The length of the lobe type burner should be made in the shape of the lobe of the entire fuel injection port, but it is considered sufficient to have a length of about 30 times the diameter due to difficulties in manufacturing and excessive production cost.

따라서, 산화제 분사구의 벽면이 로브형으로 된 경우에 비해 연료분사구와 산화제 분사구의 벽면이 동시에 로브형으로 된 경우가 로브구조를 갖는 분사구 출구에 강한 원주방향의 3차원 와가 발생하기 때문에 연료와 산화제의 혼합이 촉진되어 혼합 불량에 의한 화염 불안정성을 해소할 수 있으므로, 이는 혼합불량에 의해 화염이 불안정한 연소 유동장에는 매우 유용한 방법이 될 수 있을 것이다.Therefore, when the wall surface of the fuel injection port and the oxidant injection port are lobe-type at the same time as the wall surface of the oxidant injection port is lobe type, the strong circumferential three-dimensional vortex occurs at the outlet of the injection port having the lobe structure. Since the mixing can be promoted to solve the flame instability due to poor mixing, this can be a very useful method in the combustion flow field where the flame is unstable by the mixing failure.

또한 연료와 산화제의 혼합촉진으로 화염에서 발생하는 일산화탄소의 배출량을 도 3의 일산화탄소 특성 선도에서 비교한 결과와 같이 일산화탄소와 매연(soot)을 감소시킬 수 있으므로, 이에 따라 매연량의 제어에 유리하다.In addition, carbon monoxide and soot can be reduced as compared with the results of carbon monoxide emissions generated from the flame by promoting the mixing of fuel and oxidant, as shown in the carbon monoxide characteristic diagram of FIG.

이와 같은 본 발명의 로브형 버너를 이용한 화염안정화 방법은 버너몸체의 일측 단면에 형성된 연료분사구와 그 외측에 형성된 산화제 분사구를 삼각형 또는 사각형모양의 탭(tap)을 내거나 굴곡가공하여 원주방향을 향하는 로브형태로 형성함으로써, 연료와 산화제의 혼합을 촉진시켜 혼합 불량에 의한 화염 불안정성을 해소함과 아울러 일산화탄소와 매연(soot)을 저감시킬 수 있는 효과가 있다.The flame stabilization method using the lobe-type burner of the present invention has a fuel injection port formed at one end surface of the burner body and an oxidant injection port formed at the outside thereof in a triangular or square tap or bend process to move toward the circumferential direction. Formation of the form promotes the mixing of the fuel and the oxidant, thereby eliminating flame instability due to poor mixing, and reducing carbon monoxide and soot.

또한 기존의 화염안정화 방법과 달리 버너를 복잡하게 개조하지 않고 단순히 버너 출구만을 로브형태로 형성하여 화염을 안정시킬 수 있으며 동시에 화염길이를 증대시켜 화염의 세기를 저하시킬 수 있는 장점도 있다.In addition, unlike the conventional flame stabilization method, it is possible to stabilize the flame by simply forming the burner outlet in the form of a lobe without complicated modification of the burner, and at the same time, increase the flame length and reduce the intensity of the flame.

Claims (1)

버너몸체(10)의 일측 단면에 형성된 연료분사구(11)와 그 외측에 형성된 산화제 분사구(12)를 삼각형 또는 사각형모양의 탭(tap)을 내거나 굴곡가공하여 원주방향을 향하는 로브형태로 형성하여 연료와 산화제의 혼합을 촉진시키게 됨을 특징으로 하는 로브형 버너를 이용한 화염안정화 방법.A fuel injection port 11 formed at one end surface of the burner body 10 and an oxidant injection hole 12 formed at the outside thereof are formed in a lobe shape in a circumferential direction by forming or bending a tab or triangular shaped tap. Flame stabilization method using a lobe-type burner, characterized in that to promote the mixing of the oxidant.
KR1020000080520A 2000-12-22 2000-12-22 Method of flame stability using lobed burner KR20020051068A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543278U (en) * 1978-09-14 1980-03-21
JPS5787919U (en) * 1980-11-18 1982-05-31
JPS61181919U (en) * 1985-04-30 1986-11-13
JPS6263518U (en) * 1985-10-02 1987-04-20
JPS63116722U (en) * 1987-01-19 1988-07-28
JPH08200623A (en) * 1995-01-31 1996-08-06 Idemitsu Kosan Co Ltd Burner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543278U (en) * 1978-09-14 1980-03-21
JPS5787919U (en) * 1980-11-18 1982-05-31
JPS61181919U (en) * 1985-04-30 1986-11-13
JPS6263518U (en) * 1985-10-02 1987-04-20
JPS63116722U (en) * 1987-01-19 1988-07-28
JPH08200623A (en) * 1995-01-31 1996-08-06 Idemitsu Kosan Co Ltd Burner

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