WO2015174778A1 - Re-combustion apparatus of industrial petroleum coke boiler - Google Patents

Re-combustion apparatus of industrial petroleum coke boiler Download PDF

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Publication number
WO2015174778A1
WO2015174778A1 PCT/KR2015/004886 KR2015004886W WO2015174778A1 WO 2015174778 A1 WO2015174778 A1 WO 2015174778A1 KR 2015004886 W KR2015004886 W KR 2015004886W WO 2015174778 A1 WO2015174778 A1 WO 2015174778A1
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WIPO (PCT)
Prior art keywords
fuel
reburn
petroleum coke
boiler
nozzle
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Ceased
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PCT/KR2015/004886
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French (fr)
Korean (ko)
Inventor
이창엽
김세원
권민준
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Korea Institute of Industrial Technology KITECH
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Korea Institute of Industrial Technology KITECH
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Priority to CN201580038668.8A priority Critical patent/CN106537039A/en
Publication of WO2015174778A1 publication Critical patent/WO2015174778A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/042—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with fuel supply in stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/002—Supplying water
    • F23L7/005—Evaporated water; Steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00—Staged combustion
    • F23C2201/30—Staged fuel supply
    • F23C2201/301—Staged fuel supply with different fuels in stages

Definitions

  • the present invention relates to a reburn apparatus for a petroleum coke fuel industrial boiler, and more particularly, to a petroleum coke fuel industrial boiler to which a reburn system for reducing nitrogen oxides (NOx) generated in a system using a petroleum coke fuel is applied. It is about.
  • Industrial boilers refer to boilers used for the purpose of generating working air or hot water in general factories or establishments, and are interpreted in various meanings.
  • Petroleum coke fuel is a low-cost fuel, has the advantage of high economic efficiency.
  • the selective reduction catalyst refers to an environmental facility that converts nitrogen oxides generated by the use of fossil fuels into non-hazardous substances such as oxygen at the rear stage before being discharged to the atmosphere.
  • the non-catalytic reduction reaction (SCNR) method has an advantage of low installation cost and maintenance cost.
  • the non-catalytic reduction reaction is a catalyst-free reaction, and the nitrogen oxide removal rate is only about 40 to 50 percent, which has a disadvantage in that the efficiency is significantly lower than that of the selective reduction catalyst (SCR) method.
  • Korean Patent No. 955,537 which is a prior art filed and registered by the present applicant, discloses a reburning system
  • the present invention has been made to overcome the problems of the prior art as described above, the object of the present invention is to provide a petroleum coke fuel industrial boiler that minimizes nitrogen oxide emissions and maximizes combustion efficiency by reburning petroleum coke fuel. have.
  • the present invention for solving the above problems includes a combustion furnace provided with a combustor and a boiler connected to the combustion furnace, a fuel nozzle formed between the combustor and the boiler in the combustion furnace; An air supply unit formed in the boiler; It includes a petroleum coke fuel industrial boiler comprising a; fuel supply connected to the nozzle.
  • the fuel nozzle includes a petroleum coke fuel industrial boiler, characterized in that the reburn fuel is supplied.
  • the reburn fuel includes a petroleum coke fuel industrial boiler, characterized in that it comprises a hydrocarbon fuel supply of a liquid comprising at least one of regeneration oil, heavy oil, and diesel.
  • the fuel nozzle includes a petroleum coke fuel industrial boiler, characterized in that formed in a point where the temperature of the combustion furnace is 900 degrees Celsius or more than 1500 degrees Celsius.
  • the air supply unit includes a petroleum coke fuel industrial boiler, characterized in that it is formed to provide air at a point of 800 degrees Celsius or more in the boiler.
  • the fuel nozzle includes a petroleum coke fuel industrial boiler, characterized in that it comprises at least one of a pressure nozzle or a mixed nozzle.
  • the first step of the first combustion by the combustor formed in the combustion furnace A second step of reburning by providing a reburn fuel to a fuel nozzle formed in the combustion furnace after the first step; And a third step of supplying air for oxidation to an air supply unit formed in the boiler connected to the combustion furnace.
  • the present invention as described above has the following effects.
  • the fuel nozzle can inject only liquid using a pressure nozzle, there is an advantage that an effective reburn can be achieved as a simple structure.
  • the fuel nozzle may be made of a mixed nozzle, there is an advantage of maximizing mixing momentum with the combustion gas.
  • FIG. 1 is a block diagram of an entire system according to a preferred embodiment of the present invention.
  • FIG. 1 is a block diagram of an entire system according to a preferred embodiment of the present invention.
  • the combustor 100 is formed on one side of the combustion furnace 200 to cause primary combustion in the combustion furnace 200.
  • Combustor 100 may include a petroleum coke fuel and a mixed combustor.
  • the combustor 100 may include a petroleum coke-only combustor or a mixed combustion combustor of petroleum coke fuel and other fuels.
  • the combustion furnace 200 is preferably a combustion furnace 200 used in petroleum coke systems.
  • the petroleum coke fuel-only boiler system for petroleum coke fuel has a combustion furnace 200 for inducing complete combustion of fuel in front of the boiler 300 for steam generation unlike the existing boiler system.
  • the combustion furnace 200 including the combustor 100 is connected to the front of the boiler 300 for steam generation.
  • the fuel nozzle 600 is preferably formed between the combustor 100 and the boiler 300 in the combustion furnace 200.
  • the fuel nozzle 600 is formed near the point where the combustion furnace 200 and the boiler 300 are connected.
  • the fuel nozzle 600 is preferably formed at a point where the temperature of the combustion furnace 200 is 900 degrees Celsius or more and 1500 degrees Celsius or less.
  • the reburn fuel is preferably injected at the point where the internal temperature of the combustion furnace 200 or the boiler 300 is 900 degrees Celsius or more and 1500 degrees Celsius or less.
  • a plurality of fuel nozzles 600 are preferably formed to face the center of the combustion furnace 200 on the side wall of the combustion furnace 200.
  • the fuel nozzle 600 is connected to a reburn fuel supply line provided from a fuel supply unit to supply reburn fuel.
  • the reburn fuel preferably includes a liquid hydrocarbon fuel supply unit 400 including at least any one of regeneration oil, heavy oil and light oil.
  • the gaseous fuel mainly used in the existing reburn method decomposes hydrocarbon groups quickly, leading to the combustion reaction direction rather than the reburn reaction, but rather nitrogen oxides (NOx). This could be due to increased emissions.
  • petroleum coke fuel tends to have a slower combustion reaction because of less volatile matter and higher carbon content.
  • the supply of liquid reburn fuel is helpful in the stable operation of the combustion system because it has the effect of supplying the activation energy of the combustion reaction of the petroleum coke fuel.
  • the fuel nozzle 600 is a device for supplying a liquid reburn fuel.
  • the supply amount of the reburn fuel provided from the fuel nozzle 600 is configured to be adjustable by controlling the pressure of the pump 403.
  • the fuel nozzle 600 may inject only liquid using a pressure nozzle.
  • the fuel nozzle 600 may use a mixed nozzle to inject compressed air or steam together with the liquid reburn fuel.
  • the mixing moment with the combustion gas can be maximized.
  • a pressure nozzle when the reburn fuel is in a low quality state and there are many particles, the nozzle may be clogged. Therefore, when a low quality liquid fuel containing some solid particles or a high viscosity liquid fuel is used as the reburn fuel, It is natural that a nozzle should be used.
  • the supply amount of the reburn fuel in the hydrocarbon fuel supply unit 400 according to the preferred embodiment of the present invention is preferably calculated so as to provide a calorific value of 5 to 30 percent based on the total calorific value of the entire boiler system.
  • the hydrocarbon fuel supply unit 400 is largely divided into a fuel tank 405 including a heater 406, a first filter 404, a second filter 401, a flow meter 402, and a pump 403.
  • the fuel tank 405 is provided with liquid reburn fuel.
  • the first filter 404 is provided between the fuel tank 405 and the pump 403 to perform a filtration operation primarily when the reburned fuel exits the fuel tank 405 by the operation of the pump 403.
  • Flow meter 402 is coupled to pump 403 to indicate the amount of reburn fuel provided from fuel tank 405 to fuel nozzle 600.
  • the second filter 401 is provided between the flow meter 402 and the fuel nozzle 600 to finally perform filtration before the reburned fuel is sent to the fuel nozzle 600.
  • the air supply unit 500 is provided in the boiler 300 to inject air into the boiler 300.
  • the air supply unit 500 is an additional air supply unit for complete oxidation of carbon monoxide (CO) and hydrocarbons remaining after the combustion reaction in the combustion furnace 200.
  • Air injection through the air supply unit 500 is preferably made after the reburn fuel supply.
  • the position where the air is provided from the air supply unit 500 to the boiler 300 is preferably a point where the average temperature of the boiler 300 is 800 degrees Celsius or more.
  • the average amount of nitrogen oxides was 92 ppm (ppm), whereas the average boiler reached 155 ppm (ppm).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The present invention relates to a re-combustion apparatus of an industrial petroleum coke boiler, and more specifically to an industrial petroleum coke boiler utilizing a re-combustion system which reduces nitrogen oxide (NOx), which forms in a system utilizing petroleum coke fuel, the industrial petroleum coke boiler comprising a combustion furnace provided with a combustor, and a boiler connected to the combustion furnace, and minimizing NOx formation inside the industrial petroleum coke boiler by additionally comprising: a fuel nozzle between the combustor and boiler in the combustion furnace; an air supply unit in the boiler; and a fuel supply unit connected to the nozzle, and thus the use of costly post-processing equipment such as a selective catalytic reduction apparatus is avoided, thereby having the benefit of minimizing the nitrogen oxide formation while also lowering the initial investment and maintenance costs.

Description

석유코크스 연료 산업용 보일러의 재연소 장치Reburn apparatus of petroleum coke fuel industrial boiler

본 발명은 석유코크스 연료 산업용 보일러의 재연소 장치에 관한 것으로, 보다 상세하게는 석유코크스 연료를 사용하는 시스템에서 발생하는 질소 산화물(NOx)을 저감하도록 하는 재연소 시스템이 적용된 석유코크스 연료 산업용 보일러에 관한 것이다.The present invention relates to a reburn apparatus for a petroleum coke fuel industrial boiler, and more particularly, to a petroleum coke fuel industrial boiler to which a reburn system for reducing nitrogen oxides (NOx) generated in a system using a petroleum coke fuel is applied. It is about.

산업용 보일러는 일반 공장이나 사업소 등에서 주로 작업용 공기 또는 온수를 발생시킬 목적으로 사용하는 보일러를 가리키며 다양한 의미로 해석된다.Industrial boilers refer to boilers used for the purpose of generating working air or hot water in general factories or establishments, and are interpreted in various meanings.

산업용 보일러는 대량의 열 발생이 필요로 되고 경제적으로 저렴한 비용이 동시에 요구되기 때문에 그 연료로서 석유코크스 연료가 사용된다.Industrial boilers use petroleum coke fuels because they require large amounts of heat generation and at the same time economically low costs.

석유코크스 연료는 저가의 연료로 사용에 따른 경제성은 높은 장점이 있다.Petroleum coke fuel is a low-cost fuel, has the advantage of high economic efficiency.

그러나 연료 내 질소 성분이 높아 질소 산화물(NOx)와 같은 대기환경 오염물질이 다른 연료에 비해 상대적으로 높게 발생하는 문제가 있다.However, due to the high nitrogen content in the fuel, air pollutants such as nitrogen oxides (NOx) occur relatively higher than other fuels.

그렇기 때문에, 일반적인 산업용 보일러에는 사용하지 않는 선택적 환원촉매(Selective Catalytic Reduction, 이하 SCR이라 함) 설비와 같은 고가의 후처리 설비가 필요하였다.For this reason, expensive post-treatment equipment such as Selective Catalytic Reduction (SCR) equipment, which is not used in general industrial boilers, was required.

참고로 선택적 환원촉매(SCR)는 화석연료의 사용에 따라 발생하는 질소산화물을 대기중으로 배출시키기 전에 배출 후단에서 산소 등 유해하지 않은 물질로 전환 시키는 환경설비를 의미한다.For reference, the selective reduction catalyst (SCR) refers to an environmental facility that converts nitrogen oxides generated by the use of fossil fuels into non-hazardous substances such as oxygen at the rear stage before being discharged to the atmosphere.

이는 초기 투자비와 유지비가 높아지게 되는 문제를 야기하고 있다.This causes a problem of higher initial investment and maintenance costs.

이와 같은 산업용 보일러의 사용에 따른 문제점을 극복하기 위한 방안으로서 연소시스템에서 후처리 설비를 사용하지 않고 연소로 내에서 질소 산화물(NOx)를 저감하는 방법으로 재연소 방법과 무촉매 환원 반응(Selective Non-Catalytic Reduction 이하 SCNR 이라 함)방법이 등장하였다.In order to overcome the problems caused by the use of such industrial boilers, the method of reducing the nitrogen oxides (NOx) in the combustion furnace without using the after-treatment equipment in the combustion system. -Catalytic Reduction, or SCNR) has emerged.

무촉매 환원 반응(SCNR)법은 설치비나 유지비가 적게 들어가는 장점은 있다.The non-catalytic reduction reaction (SCNR) method has an advantage of low installation cost and maintenance cost.

그러나, 무촉매 환원 반응법(SCNR)은 촉매가 없는 반응으로서 질소 산화물 제거율이 40 내지 50 퍼센트 정도에 그쳐 선택적 환원촉매(SCR)법에 비하여 효율이 현저하게 낮은 단점이 있었다.However, the non-catalytic reduction reaction (SCNR) is a catalyst-free reaction, and the nitrogen oxide removal rate is only about 40 to 50 percent, which has a disadvantage in that the efficiency is significantly lower than that of the selective reduction catalyst (SCR) method.

이에 대하여 본 출원인의 기출원 되어 등록된 종래기술인 한국등록특허 제955,537호는 재연소 시스템에 관하여 개시하고 있으며, 또 다른 본 출원인의 기출원 등록된 종래기술인 한국등록특허 제9,593,096호는 바이오매스 재연소 시스템을 제공하고 있다.In this regard, Korean Patent No. 955,537, which is a prior art filed and registered by the present applicant, discloses a reburning system, and Korean Patent No. 9,593,096, which is a prior art, which is filed by the applicant of the present application, is biomass reburned. Providing a system.

그러나, 석유코크스 보일러의 경우 화염온도가 액화천연가스(LNG)나 중유와 같은 다른 연료를 사용하는 산업용 보일러에 비해 화염온도가 현저하게 높아 재연소나 SNCR로 인해 오히려 질소 산화물(NOx) 배출량이 증가될 수 밖에 없는 문제가 여전히 존재하고 있었던 것이다.However, in the case of petroleum coke boilers, the flame temperature is significantly higher than that of industrial boilers using liquefied natural gas (LNG) or other fuels such as heavy oil, so that NOx emissions may be increased due to reburn or SNCR. There was still a problem.

이에 본 발명은 상기한 바와 같은 종래 기술의 문제점을 극복하기 위하여 안출된 것으로, 석유코크스 연료를 재연소함으로써 질소 산화물 배출을 최소화하고 연소 효율을 극대화하는 석유코크스 연료 산업용 보일러를 제공하는 것에 그 목적이 있다.Accordingly, the present invention has been made to overcome the problems of the prior art as described above, the object of the present invention is to provide a petroleum coke fuel industrial boiler that minimizes nitrogen oxide emissions and maximizes combustion efficiency by reburning petroleum coke fuel. have.

상기와 같은 문제점을 해결하기 위한 본 발명은 연소기가 마련된 연소로 및 상기 연소로에 연결된 보일러를 포함하되, 상기 연소로에서 상기 연소기와 상기 보일러 사이에 형성된 연료노즐과; 상기 보일러에 형성된 공기 공급부와; 상기 노즐에 연결된 연료공급부;를 포함하는 것을 특징으로 하는 석유코크스 연료 산업용 보일러를 포함한다.The present invention for solving the above problems includes a combustion furnace provided with a combustor and a boiler connected to the combustion furnace, a fuel nozzle formed between the combustor and the boiler in the combustion furnace; An air supply unit formed in the boiler; It includes a petroleum coke fuel industrial boiler comprising a; fuel supply connected to the nozzle.

또한, 상기 연료노즐에는 재연소 연료가 공급되는 것을 특징으로 하는 석유코크스 연료 산업용 보일러를 포함한다.In addition, the fuel nozzle includes a petroleum coke fuel industrial boiler, characterized in that the reburn fuel is supplied.

또한, 상기 재연소 연료는 재생유, 중유, 경유 중 적어도 어느 하나를 포함하는 액체의 탄화수소 연료 공급부를 포함하는 것을 특징으로 하는 석유코크스 연료 산업용 보일러를 포함한다.In addition, the reburn fuel includes a petroleum coke fuel industrial boiler, characterized in that it comprises a hydrocarbon fuel supply of a liquid comprising at least one of regeneration oil, heavy oil, and diesel.

또한, 상기 연료노즐은 상기 연소로의 온도가 섭씨 900도씨 이상 섭씨 1500도씨 이하인 지점에 형성되는 것을 특징으로 하는 석유코크스 연료 산업용 보일러를 포함한다.In addition, the fuel nozzle includes a petroleum coke fuel industrial boiler, characterized in that formed in a point where the temperature of the combustion furnace is 900 degrees Celsius or more than 1500 degrees Celsius.

또한, 상기 공기 공급부는 상기 보일러에서 섭씨 800도씨 이상인 지점에 공기를 제공하도록 형성된 것을 특징으로 하는 석유코크스 연료 산업용 보일러를 포함한다.In addition, the air supply unit includes a petroleum coke fuel industrial boiler, characterized in that it is formed to provide air at a point of 800 degrees Celsius or more in the boiler.

또한, 상기 연료노즐은 압력식 노즐 또는 혼합식 노즐 중 적어도 어느 하나 이상을 포함하는 것을 특징으로 하는 석유코크스 연료 산업용 보일러를 포함한다.In addition, the fuel nozzle includes a petroleum coke fuel industrial boiler, characterized in that it comprises at least one of a pressure nozzle or a mixed nozzle.

또한, 연소로에 형성된 연소기에 의한 제1연소가 이루어지는 제1단계와; 상기 제1단계 이후에 상기 연소로에 형성된 연료노즐로 재연소 연료를 제공하여 재연소되는 제2단계와; 상기 연소로에 연결된 보일러에 형성된 공기 공급부로 산화용 공기를 공급하는 제3단계;를 포함하는 것을 특징으로 하는 석유코크스 연료 산업용 보일러 재연소 방법을 포함한다.In addition, the first step of the first combustion by the combustor formed in the combustion furnace; A second step of reburning by providing a reburn fuel to a fuel nozzle formed in the combustion furnace after the first step; And a third step of supplying air for oxidation to an air supply unit formed in the boiler connected to the combustion furnace.

상기한 바와 같은 본 발명은 다음과 같은 효과가 있다.The present invention as described above has the following effects.

첫째, 석유코크스 연료 산업용 보일러 내에서 질소 산화물(NOx)의 발생을 최소화함으로써 선택적 환원촉매(Selective Catalytic Reduction)장치와 같은 고가의 후처리 설비의 사용을 지양하여 설비의 초기 투자비나 유지비를 낮추면서도 질소 산화물의 발생을 극소화하는 강점이 있다.First, by minimizing the generation of NOx in petroleum coke fuel industry boilers, the use of expensive post-treatment equipment such as selective catalytic catalytic reduction equipment is avoided, reducing the initial investment and maintenance costs of the equipment. There is an advantage of minimizing the generation of oxides.

둘째, 재연소 연료의 공급으로 인하여 석유코크스 연료 시스템의 안정화에 도움이 되는 장점이 있다.Second, there is an advantage to help stabilize the petroleum coke fuel system due to the supply of reburn fuel.

셋째, 연료노즐은 압력식 노즐을 사용하여 액체만 분사할 수 있기 때문에 간단한 구조로서 효과적인 재연소가 이루어질 수 있는 이점이 있다.Third, since the fuel nozzle can inject only liquid using a pressure nozzle, there is an advantage that an effective reburn can be achieved as a simple structure.

넷째, 연료노즐이 혼합식 노즐로 이루어질 수 있기 때문에 연소가스와의 혼합 모멘텀을 극대화되는 장점이 있다.Fourth, since the fuel nozzle may be made of a mixed nozzle, there is an advantage of maximizing mixing momentum with the combustion gas.

다섯째, 공기 공급부로 산화 공기가 추가적으로 제공됨으로써, 재연소 반응 후 발생할 수 있는 일산화탄소 및 미연 탄화수소를 완전하게 제거할 수 있게 되는 이점이 있다.Fifth, by additionally providing the oxidizing air to the air supply, there is an advantage that can completely remove the carbon monoxide and unburned hydrocarbon that may occur after the reburn reaction.

도 1은 본 발명의 바람직한 실시예에 따른 전체 시스템의 구성도이다.1 is a block diagram of an entire system according to a preferred embodiment of the present invention.

도 2는 본 발명의 바람직한 실시예에 따른 실험결과 그래프이다.2 is a graph of experimental results according to a preferred embodiment of the present invention.

이하 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail.

이 과정에서 도면에 도시된 선들의 두께나 구성요소의 크기 등은 설명의 명료성과 편의상 과장되게 도시되어 있을 수 있다. 또한, 후술 되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 관례에 따라 달라질 수 있다. 그러므로 이러한 용어들에 대한 정의는 본 명세서 전반에 걸친 내용을 토대로 기술되어야 할 것이다.In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be described based on the contents throughout the specification.

도 1은 본 발명의 바람직한 실시예에 따른 전체 시스템의 구성도이다.1 is a block diagram of an entire system according to a preferred embodiment of the present invention.

도 2는 본 발명의 바람직한 실시예에 따른 실험결과 그래프이다.2 is a graph of experimental results according to a preferred embodiment of the present invention.

연소기(100)는 연소로(200)의 일측에 형성되어 연소로(200) 내부에서 1차 연소를 유발시킨다.The combustor 100 is formed on one side of the combustion furnace 200 to cause primary combustion in the combustion furnace 200.

연소기(100)는 석유코크스 연료 및 혼소용 연소기를 포함할 수 있다.Combustor 100 may include a petroleum coke fuel and a mixed combustor.

다시 말해서, 연소기(100)는 석유코크스 전용 연소기 또는 석유코크스 연료와 다른 연료의 혼합 연소 연소기를 포함할 수 있는 것이다.In other words, the combustor 100 may include a petroleum coke-only combustor or a mixed combustion combustor of petroleum coke fuel and other fuels.

연소로(200)는 석유코크스 시스템에서 사용되는 연소로(200)인 것이 바람직하다.The combustion furnace 200 is preferably a combustion furnace 200 used in petroleum coke systems.

보다 상세하게는 석유코크스 연료 전용 석유코크스 연료 산업용 보일러 시스템은 기존 보일러 시스템과 달리 스팀생성을 위하여 보일러(300) 전단에 연료의 완전 연소를 유도하기 위한 연소로(200)를 갖추고 있다.More specifically, the petroleum coke fuel-only boiler system for petroleum coke fuel has a combustion furnace 200 for inducing complete combustion of fuel in front of the boiler 300 for steam generation unlike the existing boiler system.

다시 말해서 스팀생성을 위한 보일러(300) 전단에는 연소기(100)가 포함되는 연소로(200)가 연결되고 있는 것이다.In other words, the combustion furnace 200 including the combustor 100 is connected to the front of the boiler 300 for steam generation.

보일러(300)에서는 연소로(200)에서 발생된 열이 물에 전달됨으로써 고온 및 고압의 스팀이 생산된다.In the boiler 300, heat generated in the combustion furnace 200 is transferred to water to produce steam of high temperature and high pressure.

연료노즐(600)은 연소로(200)에서 연소기(100)와 보일러(300) 사이에 형성되는 것이 바람직하다.The fuel nozzle 600 is preferably formed between the combustor 100 and the boiler 300 in the combustion furnace 200.

다시 말해서, 연료노즐(600)은 연소로(200)와 보일러(300)가 연결되는 지점 근처에 형성된다.In other words, the fuel nozzle 600 is formed near the point where the combustion furnace 200 and the boiler 300 are connected.

보다 상세하게, 연료노즐(600)은 연소로(200)의 온도가 섭씨 900도씨 이상 섭씨 1500도씨 이하인 지점에 형성되는 것이 바람직하다.In more detail, the fuel nozzle 600 is preferably formed at a point where the temperature of the combustion furnace 200 is 900 degrees Celsius or more and 1500 degrees Celsius or less.

즉, 재연소 연료는 연소로(200)나 보일러(300)의 내부 온도가 섭씨 900도씨 이상 섭씨 1500도씨 이하인 지점에서 분사하는 것이 바람직하다.That is, the reburn fuel is preferably injected at the point where the internal temperature of the combustion furnace 200 or the boiler 300 is 900 degrees Celsius or more and 1500 degrees Celsius or less.

이는 일반적인 재연소 방법을 적용하는 경우보다 높은 온도 지점 조건에서 공급하는 것으로, 화염온도가 높고 이후 온도가 급격히 떨어지는 석유코크스 연료 사용 보일러의 특성상, 재연소 연료의 공급 이후 재연소 반응시간을 확보하기 위해서이다.This is supplied at a higher temperature point than in the case of applying a general reburn method. In order to secure a reburn reaction time after supply of a reburn fuel due to the characteristics of a petroleum coke fuel using boiler having a high flame temperature and a sharp drop in temperature thereafter. to be.

다시 말해서, 재연소에 의한 질소 산화물(NOx)의 저감 반응시간을 확보하기 위해서이다.In other words, it is to ensure the reduction reaction time of nitrogen oxide (NOx) by reburn.

연료노즐(600)은 연소로(200)의 측벽에서 연소로(200)의 중심부를 향하도록 복수 개가 형성되는 것이 바람직하다.A plurality of fuel nozzles 600 are preferably formed to face the center of the combustion furnace 200 on the side wall of the combustion furnace 200.

연료노즐(600)에는 재연소 연료가 공급되도록 연료공급부로부터 제공되는 재연소 연료 공급라인이 연결되어 있다.The fuel nozzle 600 is connected to a reburn fuel supply line provided from a fuel supply unit to supply reburn fuel.

한편, 재연소 연료는 재생유, 중유, 경유 중 적어도 어느 하나를 포함하는 액체의 탄화수소 연료 공급부(400)를 포함하는 것이 바람직하다.On the other hand, the reburn fuel preferably includes a liquid hydrocarbon fuel supply unit 400 including at least any one of regeneration oil, heavy oil and light oil.

왜냐하면, 상대적으로 높은 온도조건에서 재연소 반응을 유도하기 위해서는 기존 재연소 방법에서 주로 사용하는 가스연료의 경우에는 탄화수소기의 분해가 빨라 재연소 반응보다는 연소 반응 방향으로 유도되면서 오히려 질소 산화물(NOx)의 배출량이 증가될 수 있기 때문이다.In order to induce the reburn reaction at a relatively high temperature condition, the gaseous fuel mainly used in the existing reburn method decomposes hydrocarbon groups quickly, leading to the combustion reaction direction rather than the reburn reaction, but rather nitrogen oxides (NOx). This could be due to increased emissions.

한편, 재연소 연료를 공급함으로써 연료 시스템 전체의 안정화에 도움이 된다.On the other hand, by supplying the reburn fuel, it helps to stabilize the entire fuel system.

보다 상세하게는 석유코크스 연료의 경우 휘발성 물질(Volatile)이 적고 탄소함량이 높아 연소반응이 느린 경향이 있다.More specifically, petroleum coke fuel tends to have a slower combustion reaction because of less volatile matter and higher carbon content.

이 때 액체의 재연소 연료를 공급하게 되면 이러한 석유코크스 연료의 연소반응 활성화 에너지를 공급하는 효과가 있기 때문에 연소시스템의 안정적 운전에 도움이 되는 것이다.At this time, the supply of liquid reburn fuel is helpful in the stable operation of the combustion system because it has the effect of supplying the activation energy of the combustion reaction of the petroleum coke fuel.

연료노즐(600)은 액상의 재연소 연료를 공급을 위한 장치이다.The fuel nozzle 600 is a device for supplying a liquid reburn fuel.

연료노즐(600)로부터 제공되는 재연소 연료의 공급량은 펌프(403)의 압력을 제어함으로써 조절이 가능하도록 구성된다.The supply amount of the reburn fuel provided from the fuel nozzle 600 is configured to be adjustable by controlling the pressure of the pump 403.

연료노즐(600)은 압력식 노즐을 사용하여 액체만 분사할 수도 있다.The fuel nozzle 600 may inject only liquid using a pressure nozzle.

본 발명의 또 다른 바람직한 일실시예에 따른 연료노즐(600)은 혼합식 노즐을 사용하여 압축공기나 스팀을 액체 재연소 연료와 함께 분사할 수도 있다.The fuel nozzle 600 according to another preferred embodiment of the present invention may use a mixed nozzle to inject compressed air or steam together with the liquid reburn fuel.

연료노즐(600)이 혼합식 노즐인 경우 연소가스와의 혼합 모멘텀을 극대화 할 수 있게 된다.When the fuel nozzle 600 is a mixed nozzle, the mixing moment with the combustion gas can be maximized.

압력식 노즐의 경우 재연소 연료가 저질의 상태로 입자가 많은 경우 노즐의 막힘 현상이 발생할 수 있으므로, 고체입자가 일부 포함되어 있거나 점성이 높은 저질의 액체 연료를 재연소 연료로 사용할 경우에는 혼합식 노즐이 사용되어야 함은 당연하다.In the case of a pressure nozzle, when the reburn fuel is in a low quality state and there are many particles, the nozzle may be clogged. Therefore, when a low quality liquid fuel containing some solid particles or a high viscosity liquid fuel is used as the reburn fuel, It is natural that a nozzle should be used.

본 발명의 바람직한 일실시예에 따른 탄화수소 연료 공급부(400)에서의 재연소 연료의 공급량은 전체 보일러 시스템의 열량을 기준으로 5 퍼센트 내지 30 퍼센트 수준의 열량이 되도록 계산하여 공급하는 것이 바람직하다.The supply amount of the reburn fuel in the hydrocarbon fuel supply unit 400 according to the preferred embodiment of the present invention is preferably calculated so as to provide a calorific value of 5 to 30 percent based on the total calorific value of the entire boiler system.

탄화수소 연료 공급부(400)는 크게 히터(406)가 포함된 연료탱크(405)와, 제1필터(404), 제2필터(401), 그리고 유량계(402)와 펌프(403)로 구분된다.The hydrocarbon fuel supply unit 400 is largely divided into a fuel tank 405 including a heater 406, a first filter 404, a second filter 401, a flow meter 402, and a pump 403.

연료탱크(405)에는 액상의 재연소 연료가 제공된다.The fuel tank 405 is provided with liquid reburn fuel.

제1필터(404)는 연료탱크(405)와 펌프(403) 사이에 마련되어 재연소 연료가 펌프(403)의 작동으로 연료탱크(405)를 빠져 나올 때 1차적으로 여과작업이 수행된다.The first filter 404 is provided between the fuel tank 405 and the pump 403 to perform a filtration operation primarily when the reburned fuel exits the fuel tank 405 by the operation of the pump 403.

유량계(402)는 펌프(403)에 연결되어 연료탱크(405)로부터 연료노즐(600)로 제공되는 재연소 연료의 양을 표시한다.Flow meter 402 is coupled to pump 403 to indicate the amount of reburn fuel provided from fuel tank 405 to fuel nozzle 600.

제2필터(401)는 유량계(402)와 연료노즐(600) 사이에 마련되어 재연소 연료가 연료노즐(600)로 보내지기 전에 최종적으로 여과작업을 수행하게 된다.The second filter 401 is provided between the flow meter 402 and the fuel nozzle 600 to finally perform filtration before the reburned fuel is sent to the fuel nozzle 600.

따라서 연료노즐(600)의 막힘 등 문제는 발생되지 않게 된다.Therefore, problems such as clogging of the fuel nozzle 600 are not generated.

공기 공급부(500)는 보일러(300)에 마련되어 보일러(300) 내부로 에어를 주입시킨다.The air supply unit 500 is provided in the boiler 300 to inject air into the boiler 300.

공기 공급부(500)는 연소로(200)에서의 연소 반응 이후 잔류하는 일산화탄소(CO) 및 탄화수소물의 완전 산화를 위한 추가 공기 공급 장치이다.The air supply unit 500 is an additional air supply unit for complete oxidation of carbon monoxide (CO) and hydrocarbons remaining after the combustion reaction in the combustion furnace 200.

공기 공급부(500)를 통한 에어 주입은 재연소 연료 공급 이후 시점에 이루어지는 것이 바람직하다.Air injection through the air supply unit 500 is preferably made after the reburn fuel supply.

한편, 에어가 공기 공급부(500)로부터 보일러(300)로 제공되는 위치는 보일러(300)의 평균온도가 섭씨 800도씨 이상인 지점이 바람직하다.On the other hand, the position where the air is provided from the air supply unit 500 to the boiler 300 is preferably a point where the average temperature of the boiler 300 is 800 degrees Celsius or more.

재생유와 같은 고분자량의 액체 재연소 연료의 경우 기체 재연소 연료에 비해 느린 반응을 보이므로 산화용 공기가 추가적으로 투입되는 것이 바람직하다.In the case of a high molecular weight liquid reburn fuel, such as regenerated oil, the reaction is slower than that of the gas reburn fuel.

이상과 같은 본 발명의 바람직한 실시예에 따른 석유코크스 연료 산업용 보일러를 통한 질소 산화물 배출량은 도 2에서와 같이 재연소를 이용하지 않은 경우 보다 현저하게 낮게 나타남을 확인할 수 있었다.Nitrogen oxide emissions through the petroleum coke fuel industrial boiler according to the preferred embodiment of the present invention as described above was confirmed to be significantly lower than when not using the reburn as shown in FIG.

보다 상세하게는, 본 발명의 바람직한 실시예에 따른 석유코크스 연료 산업용 보일러에서는 질소 산화물의 배출량이 평균 92 피피엠(ppm) 수준임에 반해 일반 보일러에서는 평균 155 피피엠(ppm)에 이르는 것으로 나타났다.More specifically, in the petroleum coke fuel industrial boiler according to the preferred embodiment of the present invention, the average amount of nitrogen oxides was 92 ppm (ppm), whereas the average boiler reached 155 ppm (ppm).

이러한 실험결과는 본 발명의 바람직한 실시예에 따른 석유코크스 연료 산업용 보일러가 일반 산업용 보일러에 비하여 질소 산화물의 배출량이 현저하게 낮으면서도 고효율의 보일러임을 증명하는 것임을 알 수 있다.These experimental results can be seen that the petroleum coke fuel industrial boiler according to a preferred embodiment of the present invention proves to be a highly efficient boiler with a significantly lower emission of nitrogen oxides than a general industrial boiler.

상기에서는 본 발명의 바람직한 실시 예를 참조하여 설명하였지만, 당업계에서 통상의 지식을 가진 자라면 이하의 특허 청구범위에 기재된 본 발명의 사상 및 영역을 벗어나지 않은 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.Although described above with reference to a preferred embodiment of the present invention, those of ordinary skill in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below It will be appreciated that it can be changed.

Claims (9)

석유코크스 연료가 유입되어 1차 연소가 이루어지는 연소기(100);A combustor 100 into which petroleum coke fuel is introduced to perform primary combustion; 상기 연소기(100)의 후단에 구비되어, 탄화수소 연료인 재연소연료가 다수의 연료노즐(600)을 통해 주입되어 완전연소가 이루어지는 연소로(200);A combustion furnace (200) provided at a rear end of the combustor (100), in which a reburn fuel, which is a hydrocarbon fuel, is injected through a plurality of fuel nozzles (600) to complete combustion; 상기 연소로(200)의 후단에 구비되며 상기 연소로(200)의 열을 이용하여 스팀을 생성하는 보일러(300); 및A boiler 300 provided at a rear end of the combustion furnace 200 and generating steam by using heat of the combustion furnace 200; And 상기 연료노즐(600)을 통하여 재연소연료를 공급하는 탄화수소 연료 공급부(400)를 포함하며, It includes a hydrocarbon fuel supply unit 400 for supplying reburn fuel through the fuel nozzle 600, 상기 연료노즐(600)은 상기 연소로(200)와 상기 보일러(300)가 연결되는 지점에 위치하는,The fuel nozzle 600 is located at the point where the combustion furnace 200 and the boiler 300 is connected, 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 1 항에 있어서,The method of claim 1, 상기 재연소 연료는 상기 연소로(200) 또는 상기 보일러(300)의 내부 온도가 섭씨 900도씨 이상 섭씨 1500도씨 이하인 지점에서 분사됨으로써, 상기 재연소 연료의 공급 이후 재연소 반응시간이 확보되고, 질소 산화물(NOx)의 저감 반응시간이 확보되는, The reburn fuel is injected at a point where the internal temperature of the combustion furnace 200 or the boiler 300 is 900 degrees Celsius or more and 1500 degrees Celsius or less, thereby ensuring a reburn reaction time after the supply of the reburn fuel. To ensure a reduction reaction time of NOx 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 2 항에 있어서, The method of claim 2, 상기 연료노즐(600)은 혼합식 노즐이며, 상기 연료 노즐(600)을 통하여 압축공기 또는 스팀이 액체인 상기 재연소 연료와 함께 분사되는, The fuel nozzle 600 is a mixed nozzle, which is injected through the fuel nozzle 600 together with the reburn fuel in which compressed air or steam is a liquid, 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 3 항에 있어서, The method of claim 3, wherein 상기 재연소 장치는, 상기 보일러(300) 내측으로 에어를 주입하는 공기 공급부(500)를 더 포함하여, 상기 연소로(200)에서의 연소 반응 이후 잔류하는 일산화탄소(CO) 및 탄화수소물의 완전 산화가 이루어지는, The reburn apparatus further includes an air supply unit 500 for injecting air into the boiler 300 so that complete oxidation of carbon monoxide (CO) and hydrocarbons remaining after the combustion reaction in the combustion furnace 200 is performed. Made up of, 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 4 항에 있어서, The method of claim 4, wherein 상기 공기 공급부(500)를 통한 에어 주입은 상기 연료노즐(600)을 통한 재연소 연료 공급 이후 이루어지는,Air injection through the air supply unit 500 is made after the reburn fuel supply through the fuel nozzle 600, 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 4 항에 있어서, The method of claim 4, wherein 상기 공기 공급부(500)를 통한 에어 주입이 상기 보일러(300)의 평균온도가 섭씨 800도씨 이상인 지점에서 이루어짐으로써, 고분자량인 상기 액체 재연소 연료의 상대적인 느린 반응 이후 상기 주입된 에어가 산화용 공기로서 이용되는, Since the air injection through the air supply unit 500 is made at a point where the average temperature of the boiler 300 is 800 degrees Celsius or more, the injected air is oxidized after the relatively slow reaction of the high molecular weight liquid reburn fuel. Used as air, 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 2 항에 있어서,The method of claim 2, 상기 보일러(300)에서의 스팀 생성 이후 질소 산화물의 배출량이 평균 92 피피엠(ppm)인, After the steam generation in the boiler 300, the emission of nitrogen oxides is an average of 92 pippm (ppm), 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 2 항에 있어서,The method of claim 2, 상기 탄화수소 연료 공급부(400)는 히터(406)가 포함된 연료탱크(405)를 포함하여, 재연소연료가 히팅되어 공급되는, The hydrocarbon fuel supply unit 400 includes a fuel tank 405 including a heater 406, to which a reburn fuel is heated and supplied. 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers. 제 8 항에 있어서,The method of claim 8, 상기 탄화수소 연료 공급부(400)는 상기 연료탱크(405)와 상기 연료노즐(600) 사이에 구비되는 제1필터(404) 및 제2필터(401)를 포함하여, 히팅되고 여과된 재연소연료가 상기 연료노즐(600)을 통해 공급되는, The hydrocarbon fuel supply unit 400 may include a first filter 404 and a second filter 401 provided between the fuel tank 405 and the fuel nozzle 600 to heat and filter the reburned fuel. Supplied through the fuel nozzle 600, 석유코크스 연료 산업용 보일러의 재연소 장치.Reburn apparatus for petroleum coke fuel industrial boilers.
PCT/KR2015/004886 2014-05-15 2015-05-15 Re-combustion apparatus of industrial petroleum coke boiler Ceased WO2015174778A1 (en)

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