KR101008491B1 - Incinerating system of liquid waste from chemical cleaning of nuclear steam generator and method thereof - Google Patents

Incinerating system of liquid waste from chemical cleaning of nuclear steam generator and method thereof Download PDF

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KR101008491B1
KR101008491B1 KR1020100091679A KR20100091679A KR101008491B1 KR 101008491 B1 KR101008491 B1 KR 101008491B1 KR 1020100091679 A KR1020100091679 A KR 1020100091679A KR 20100091679 A KR20100091679 A KR 20100091679A KR 101008491 B1 KR101008491 B1 KR 101008491B1
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South Korea
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waste liquid
cleaning waste
furnace
electric furnace
steam generator
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KR1020100091679A
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Korean (ko)
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정봉원
장희곤
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세안기술 주식회사
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/14—Processing by incineration; by calcination, e.g. desiccation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes

Abstract

PURPOSE: A system and a method thereof are provided to effectively and thermally decompose EDTA included in a chemical cleaning waste solution by dually and thermally decomposing the chemical cleaning waste solution through an electric furnace and an oxidation furnace. CONSTITUTION: An evaporative concentration device(10) evaporates and concentrates a cleaning waste solution. An electric furnace(30) thermally decomposes the cleaning waste solution that passes the evaporative concentration device. An oxidation furnace(40) oxidizes exhaust gas exhausted from the electric furnace. A catalyst reactor(50) eliminates the toxic gas that is discharged from the oxidation furnace. A condensed water storage container(60) cools the exhaust gas that is exhausted from the catalyst reactor.

Description

증기발생기 화학 세정폐액 처리시스템 및 이를 이용한 방법{Incinerating System of Liquid Waste from Chemical Cleaning of Nuclear Steam Generator and Method Thereof} Steam generator chemical cleaning waste treatment system and method using the same {Incinerating System of Liquid Waste from Chemical Cleaning of Nuclear Steam Generator and Method Thereof}

본 발명은 방사성 액상 폐기물의 처리시스템 및 이를 이용한 방법에 관한 것으로, 보다 구체적으로는 원자력발전소의 증기발생기 2차계통 내부 전열관 등에 침적 또는 침착되는 금속산화물을 제거하는 과정에서 발생되는 화학 세정폐액을 효과적이고 안전하게 처리하는 세정폐액 처리시스템 및 세정폐액 처리방법에 관한 것이다.
The present invention relates to a treatment system for radioactive liquid waste and a method using the same. More specifically, the chemical cleaning waste liquid generated in the process of removing metal oxide deposited or deposited on the inner heat pipe of the steam generator secondary system of a nuclear power plant is effective. The present invention relates to a cleaning waste treatment system and a cleaning waste treatment method for safely and safely treating.

원자력발전소의 증기발생기 2차 계통 배관의 내부에는 시간이 경과됨에 따라 금속산화물과 물이 혼합된 형태의 슬러지가 생성되며, 이러한 슬러지를 제거하기 위해 통상 에틸렌 다이아민 테트라 아세트산(Ethylene Diamine Tetra Acetic Acid, 화학식 C10H16N2O8, 이하 “EDTA”라 약칭한다.)이 함유된 화학 세정액이 사용된다. Sludge in the form of a mixture of metal oxides and water is generated in the steam generator secondary system piping of a nuclear power plant as time passes. A chemical cleaning liquid containing a chemical formula C 10 H 16 N 2 O 8 , hereinafter abbreviated as "EDTA" is used.

EDTA는 증기발생기 2차 계통 내부에 침적되어 있거나 전열관 및 내부구조물 등에 침착되어 있는 슬러지 중 고형 성분인 금속산화물과 반응하여 고형성분을 액상으로 변환시켜 EDTA 화학 세정폐액(이하 “세정폐액”이라 약칭한다.) 형태로 배출되는데, 이때 세정폐액은 액체 상태이기 때문에 고체상태의 슬러지보다 쉽게 증기발생기로부터 제거될 수 있다. EDTA is abbreviated as EDTA chemical cleaning waste liquid (hereinafter referred to as "cleaning waste liquid") by converting solid components into liquid phase by reacting with solid metal oxides in sludge deposited in the steam generator secondary system or deposited on heat pipes and internal structures. In the form of.), Since the cleaning waste liquid is in the liquid state and can be removed from the steam generator more easily than solid sludge.

세정폐액에는 방사능 물질이 함유되어 있으며 이러한 세정폐액을 시멘트 등으로 고화처리하여도 세정폐액으로 인해 이온성 방사성 물질의 침출성이 오히려 증가되어 방사성 물질이 보다 용이하게 외부로 유출될 수 있으며, 이에 따라 방사성 폐기물 처분장의 안정성을 확보하기 위해서도 세정폐액은 안정된 형태로 분해 처리되어야 한다. The cleaning waste liquid contains radioactive material, and even if the cleaning waste liquid is solidified with cement, the leaching property of the ionic radioactive material is increased due to the cleaning waste liquid, so that the radioactive material can be easily released to the outside. In order to ensure the stability of the radioactive waste disposal site, the cleaning waste liquid must be decomposed into a stable form.

한편 EDTA는 금속 이온에 대해 강한 친화력을 가지고 있기 때문에 슬러지 제거를 위한 화학세정제로서 널리 사용되고 있으며, 상온에서 분말 또는 백색 결정 형태로 존재하고, 증기발생기를 세정하기 위한 용도로 사용할 때에는 이러한 고체상태의 EDTA 분말을 물에 일정량 희석시켜 사용하는데, EDTA는 245℃ 이상에서 쉽게 분해되기 때문에 고온 열분해 방식으로 분해 처리될 수 있다.EDTA is widely used as a chemical cleaner for sludge removal due to its strong affinity for metal ions. It is present in the form of powder or white crystals at room temperature, and is used as a solid EDTA to clean steam generators. The powder is diluted in water in a certain amount, and since EDTA is easily decomposed at 245 ° C. or higher, it can be decomposed by high temperature pyrolysis.

세정폐액을 고온 열분해 방식에 의해 처리하는 방법의 하나로서 특허 제956975호(발명의 명칭: 고온 플라즈마 기술을 이용한 방사성 물질을 함유한 폐액의 처리방법 및 처리장치)에 제시된 방법이 알려져 있으며, 이 방법은 플라즈마를 이용하여 처리하는 방법으로서 도 1에 도시된 바와 같이 플라즈마 토치를 사용하여 이로부터 생성된 플라즈마 화염 내부에 세정폐액을 분무시켜 세정폐액 속의 EDTA를 분해하는 방법이다.As a method of treating the cleaning waste liquid by a high temperature pyrolysis method, a method disclosed in Patent No. 956975 (name of the invention: a method and apparatus for treating waste liquid containing radioactive material using high temperature plasma technology) is known, and this method is known. 1 is a method of treating plasma using a plasma torch and spraying the cleaning waste liquid into the plasma flame generated therefrom as shown in FIG. 1 to decompose EDTA in the cleaning waste liquid.

그러나 이 방법은 점성이 높은 세정폐액이 완전 무화되지 않은 상태에서 짧은 반응시간 동안 플라즈마 화염 속에 노출되어 열분해 과정을 거치기 때문에 충분히 분해되지 못하는 문제점이 있을 뿐만 아니라, 세정폐액을 분무상태로 플라즈마 화염 내부로 통과시키는 과정에서 다량의 비산재가 생성되기 때문에 이것을 제거하기 위해 별도의 싸이클론 집진기 등의 부대설비가 설치되어야 하는 단점이 있다. However, this method has a problem that the highly viscous cleaning waste solution is not completely atomized and is not sufficiently decomposed because it is exposed to the plasma flame for a short reaction time and undergoes pyrolysis, and the cleaning waste solution is sprayed into the plasma flame. Since a large amount of fly ash is generated in the process of passing, there is a disadvantage that a separate cyclone dust collector, etc. must be installed to remove this.

이에 더하여 플라즈마 장치는 전력 소모가 많으며, 주기적으로 전극을 교체하여야 하기 때문에 이때마다 전체 장비를 정지시켜야 하고, 또한 고온의 플라즈마 화염에 의해 공기 중에 함유된 질소 성분이 질소산화물로 변환되어 다량의 질소산화물이 발생되는 문제점도 있다.
In addition, since the plasma apparatus consumes a lot of power and the electrodes have to be replaced periodically, the entire equipment must be stopped at each time. Also, the nitrogen content contained in the air is converted to nitrogen oxides by the high temperature plasma flame, and thus a large amount of nitrogen oxides are used. There is also a problem that occurs.

본 발명은 상기와 같은 문제점을 해결하기 위해 개발된 것으로, 본 발명은 질소산화물이 생성되지 않으며, 집진기 등의 부대시설을 설치하지 않고도 방사성 물질이 함유된 세정폐액을 안정되고 효과적으로 처리할 수 있는 증기발생기 화학 세정폐액 처리시스템 및 이를 이용한 처리방법을 제공하는 것에 그 목적이 있다.
The present invention was developed to solve the above problems, the present invention is not produced nitrogen oxide, steam that can stably and effectively treat the cleaning waste liquid containing radioactive material without installing additional facilities such as dust collector It is an object of the present invention to provide a generator chemical cleaning waste treatment system and a treatment method using the same.

상기와 같은 본 발명의 목적은 증기발생기 화학 세정폐액 처리시스템을, 세정폐액을 증발 농축시키는 증발농축장치와; 상기 증발농축장치를 거친 세정폐액을 가열하여 열분해시키는 전기로와; 상기 전기로로부터 배출되는 배기가스를 가열 산화시키는 산화로와; 상기 산화로의 하류측에 위치하여 상기 산화로로부터 배출되는 배기가스 중의 유해가스를 제거하는 촉매반응로와; 상기 촉매반응로로부터 배출되는 배기가스를 냉각시켜 응축수 상태로 저장하는 응축수저장용기로 구성하는 것에 의해 달성된다.
An object of the present invention as described above is the steam generator chemical cleaning waste treatment system, the evaporation concentrating device for evaporating and concentrating the cleaning waste liquid; An electric furnace for heating and pyrolyzing the cleaning waste liquid passed through the evaporation concentrator; An oxidation furnace for heating and oxidizing exhaust gas discharged from the electric furnace; A catalytic reactor located at a downstream side of the oxidation furnace to remove harmful gas in the exhaust gas discharged from the oxidation furnace; It is achieved by configuring a condensate storage container for cooling the exhaust gas discharged from the catalytic reactor to store in a condensate state.

본 발명은 EDTA 화학 세정폐액이 전기로와 산화로에 의해 이중으로 열분해되기 때문에 세정폐액 속에 포함된 EDTA가 효과적으로 열분해되어 제거된다.In the present invention, since EDTA chemical cleaning waste is thermally decomposed by electric furnace and oxidation furnace, EDTA contained in the cleaning waste solution is effectively pyrolyzed and removed.

또한 본 발명은 세정폐액이 전기로 내부에서 비교적 낮은 온도 범위에서 열분해되기 때문에 플라즈마 화염을 이용하여 열분해하는 것과 달리 열분해과정에서 질소산화물이 생성되지 않는다. In addition, in the present invention, since the cleaning waste is pyrolyzed in a relatively low temperature range inside the electric furnace, nitrogen oxides are not generated during the pyrolysis process, unlike pyrolysis using a plasma flame.

이에 더하여 본 발명은 세정폐액이 폐액가열용기 내부에 수용된 상태에서 가열 처리되기 때문에 가열과정에서 비산재 등이 발생되지 않고, 이에 따라 비산재 등을 제거하기 위한 별도의 장치가 마련될 필요가 없다.
In addition, in the present invention, since the cleaning waste solution is heated in a state in which the waste liquid is accommodated in the heating container, no fly ash is generated during the heating process, and thus, a separate device for removing the fly ash does not need to be provided.

도 1은 종래의 고온 플라즈마 기술을 이용한 폐액의 처리장치를 설명하기 위한 블록도이고,
도 2는 본 발명의 증기발생기 화학 세정폐액 처리시스템을 나타낸 공정도이며,
도 3 : 본 발명의 증기발생기 화학 세정폐액 처리시스템에 사용되는 전기로의 사시도이고,
도 4는 본 발명의 증기발생기 화학 세정폐액 처리방법을 나타내는 순서도이다.1 is a block diagram illustrating an apparatus for treating waste liquid using a conventional high temperature plasma technique.
Figure 2 is a process diagram showing a steam generator chemical cleaning waste treatment system of the present invention,
3 is a perspective view of an electric furnace used in the steam generator chemical cleaning waste treatment system of the present invention,
Figure 4 is a flow chart showing a steam generator chemical cleaning waste treatment method of the present invention.

이하에서는 본 발명의 구성과 실시예를 첨부된 도면을 통해 더욱 상세히 설명한다.
Hereinafter, the configuration and the embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

본 발명은 전기로를 이용하여 증기발생기 2차계통으로부터 배출되는 방사성 물질이 함유된 세정폐액을 효과적으로 처리하기 위한 세정폐액 처리시스템 및 방법을 제공하고자 하는 것으로, 이를 위해 본 발명의 세정폐액 처리시스템은 도 1 및 도 2에 도시된 바와 같이 크게 증발농축장치(10), 폐액저장탱크(20), 전기로(30), 산화로(40), 촉매반응로(50) 등을 포함한다.
The present invention is to provide a cleaning waste treatment system and method for effectively treating the cleaning waste liquid containing radioactive material discharged from the steam generator secondary system using an electric furnace, for this purpose the cleaning waste treatment system of the present invention As shown in FIG. 1 and FIG. 2, the evaporation concentrator 10, a waste liquid storage tank 20, an electric furnace 30, an oxidation furnace 40, and a catalytic reactor 50 may be included.

증발농축장치(10)는 증기발생기의 2차계통 배관의 내부를 세정할 때 발생된 세정폐액(1)을 증발시켜 그 속에 포함된 수분을 제거함으로써 세정폐액을 농축시키는 장치로서 이를 위해 본 발명의 증발농축장치(10)는 탱크 형상의 용기로 이루어지고, 그 내부는 대기압 이하의 낮은 압력으로 유지되는데, 이에 의해 세정폐액(1) 속의 수분이 효과적으로 증발되어 제거되면서 세정폐액(1)은 농도가 진한 농축액으로 된다.The evaporation concentrator 10 is a device for concentrating the cleaning waste liquid by evaporating the cleaning waste liquid 1 generated when cleaning the inside of the secondary system pipe of the steam generator to remove moisture contained therein. The evaporation concentrator 10 is composed of a tank-shaped container, the inside of which is maintained at a low pressure below atmospheric pressure, whereby the moisture in the washing waste liquid 1 is effectively evaporated and removed, so that the washing waste liquid 1 has a concentration. It is concentrated.

증발농축장치(10)의 내부에 머무르면서 그 속에 포함된 수분이 어느 정도 제거된 세정폐액(1)은 배관을 통해 그 하류측에 위치하는 폐액저장탱크(20)로 이송 및 보관된다.The cleaning waste liquid 1, which is retained inside the evaporation concentrator 10, to which some of the moisture contained therein is removed, is transferred and stored to the waste liquid storage tank 20 located downstream thereof through a pipe.

폐액저장탱크(20)에 보관된 세정폐액(1)은 다시 이송펌프에 의해 배관을 통해 전기로(30)로 이송된다.
The cleaning waste liquid 1 stored in the waste liquid storage tank 20 is again transferred to the electric furnace 30 through a pipe by a transfer pump.

전기로(30)는 세정폐액을 전기히터로 이루어진 발열체에 의해 일정 온도로 가열하는 장치로서, 본 발명의 전기로(30)는 도 2에 도시된 바와 같이 프레임(31), 하부케이싱(32) 및 상부케이싱(33)으로 이루어지며, 상기 하부케이싱(32)의 내부에는 원통형으로 이루어진 한 쌍의 폐액가열용기(34)가 좌우로 설치되고, 이 폐액가열용기(34)의 외주면에는 전기히터로 이루어진 제1발열체(35)가 각각 설치된다. 그리고 상부케이싱(33) 내부에는 후드(37)가 설치되며, 이 후드(37)에는 외측으로부터 인입 설치되는 복수 개의 전열히터로 이루어진 제2발열체(36)가 구비된다.Electric furnace 30 is a device for heating the cleaning waste liquid to a constant temperature by a heating element consisting of an electric heater, the electric furnace 30 of the present invention, as shown in Figure 2 frame 31, the lower casing 32 And an upper casing (33), and a pair of waste liquid heating containers (34) formed in a cylindrical shape are installed in the lower casing (32) to the left and right, and an electric heater on the outer circumferential surface of the waste liquid heating container (34). The first heating element 35 is provided, respectively. A hood 37 is installed inside the upper casing 33, and the hood 37 is provided with a second heating element 36 including a plurality of heat transfer heaters installed from the outside.

그리고 상기 하부케이싱(32)은 프레임(31)에 설치된 한 쌍의 볼스크류(38)와 4개의 가이드바(39)에 결합되어 있으며 이에 의해 전기모터(도시하지 않음)가 구동되면 볼스크류(38)가 회전되면서 하부케이싱(33)이 가이드바(39)에 안내되면서 안정적으로 상하로 승하강될 수 있다.The lower casing 32 is coupled to a pair of ball screws 38 and four guide bars 39 installed on the frame 31, whereby the ball screw 38 is driven when an electric motor (not shown) is driven. As the lower casing 33 is guided to the guide bar 39 while being rotated, it can be stably moved up and down.

상기와 같은 구조에 의해 전기로(30) 내부의 폐액가열용기(34) 내에 세정폐액(1)이 공급되면 하부케이싱(32)이 승강되어 상부케이싱(33)과 밀착되고, 이 상태에서 상기 제1,2발열체(35, 36)가 발열되면서 전기로(30)의 내부는 245~900℃의 온도범위로 유지되며 이를 위해 전기로(30)의 내부에는 별도의 온도센서(도시하지 않음)가 장착된다.When the cleaning waste liquid 1 is supplied into the waste liquid heating container 34 inside the electric furnace 30 by the structure as described above, the lower casing 32 is elevated to be in close contact with the upper casing 33. As the first and second heating elements 35 and 36 generate heat, the inside of the electric furnace 30 is maintained at a temperature range of 245 to 900 ° C. For this purpose, a separate temperature sensor (not shown) is provided inside the electric furnace 30. Is mounted.

상기와 같이 전기로(30) 내부의 온도를 245~900℃의 온도범위로 유지함으로써 245℃ 이상에서 세정폐액(1) 속의 EDTA가 쉽게 분해되며, 동시에 900℃를 넘지 않으므로 질소산화물이 생성되지 않는다.
By maintaining the temperature in the electric furnace 30 in the temperature range of 245 ~ 900 ℃ as described above, EDTA in the cleaning waste liquid 1 is easily decomposed at 245 ℃ or more, and at the same time does not exceed 900 ℃ does not produce nitrogen oxides. .

전기로(30) 내부의 온도가 245~900℃의 범위로 유지되면 이에 의해 폐액가열용기(34) 내부에 수용된 세정폐액(1) 속에 포함된 수분 등의 액체성분이 증발 제거되면서 폐액가열용기(34) 속에는 고체성분만 남게 된다. If the temperature inside the electric furnace 30 is maintained in the range of 245 ~ 900 ℃ by this the liquid components such as water contained in the cleaning waste solution (1) accommodated in the waste liquid heating container 34 is evaporated and removed waste liquid heating vessel ( 34) Only solid components remain in it.

폐액가열용기(34) 내부에 잔류하는 고체성분을 계속 가열하게 되면 이 고체성분 중 EDTA가 탄화수소 또는 탄소 형태로 열분해되며, 이때 공기공급라인(도시하지 않음)을 통해 공기를 공급하게 되면 이들 탄화수소 또는 탄소 형태는 공급된 산소와 반응하여 가연성 물질은 연소되는데 이 과정에서 질소, 이산화탄소, 일산화탄소 등이 생성되며 이들 가스는 상부케이싱(33) 내부의 후드(37)를 통해 후술하는 산화로(40)로 배출되고, 최종적으로 폐액가열용기(34)의 내부에는 재(ash)만 남게 되며, 이 재는 전기로(30)로부터 수작업에 의해 제거되어 폐기된다.
When the solid component remaining in the waste liquid heating container 34 is continuously heated, EDTA of the solid component is pyrolyzed in the form of hydrocarbon or carbon, and when the air is supplied through an air supply line (not shown), these hydrocarbons or The carbon form reacts with the supplied oxygen to combust the combustible material. In the process, nitrogen, carbon dioxide, carbon monoxide, etc. are generated, and these gases are fed to the oxidation furnace 40 described later through the hood 37 inside the upper casing 33. Finally, only ash is left in the waste liquid heating container 34, and the ash is manually removed from the electric furnace 30 and disposed of.

전기로(30)의 하류측에 위치되는 산화로(40)는 전기로(30)에서 1차적으로 열분해된 후 배출되는 배기가스 중 완전히 열분해되지 않은 휘발성 유기물을 산화시키는 장치로서, 이 산화로(40)에는 별도의 가스에 의해 연소되는 가열기(43)가 구비되어 있어 이 가열기(43)에 의해 산화로(40) 내부의 온도가 500~900℃의 온도 범위로 유지되며, 이에 의해 전기로(30)에서 완전히 분해되지 않은 유기물 등이 재차 가열되면서 완전히 열분해되어 후술하는 촉매반응로(50)로 배출된다.The oxidation furnace 40 located downstream of the electric furnace 30 is an apparatus for oxidizing volatile organic substances that are not completely pyrolyzed in exhaust gas discharged after being primarily pyrolyzed in the electric furnace 30. The heater 43 is provided with a heater 43 which is burned by a separate gas so that the temperature inside the oxidation furnace 40 is maintained in the temperature range of 500 to 900 ° C by the heater 43, whereby the electric furnace ( In 30), the organic material and the like that are not completely decomposed are completely pyrolyzed while being heated again and discharged to the catalytic reactor 50 to be described later.

산화로(40)로부터 배출되는 배기가스는 500~900℃ 온도범위의 고온 상태이기 때문에 배기가스의 배관에는 열교환기(41)를 설치하여 이 열교환기(41)에 의해 산화로(40)로부터 배출되는 배기가스 내에 포함된 열에너지를 회수하는 것이 바람직하며, 이에 의해 열교환기를 통과한 배기가스는 200~300℃ 정도로 냉각되어 하류측으로 흐른다. Since the exhaust gas discharged from the oxidation furnace 40 is a high temperature in the temperature range of 500 to 900 ° C., a heat exchanger 41 is installed in the piping of the exhaust gas and is discharged from the oxidation furnace 40 by the heat exchanger 41. It is preferable to recover the thermal energy contained in the exhaust gas, whereby the exhaust gas passing through the heat exchanger is cooled to about 200 to 300 ° C. and flows downstream.

이때 열교환기(41)의 내부를 흐르면서 산화로(40)로부터 배출되는 배기가스에 포함된 폐열에 의해 가열된 공기는 공기공급라인(42)을 통해 전기로(30)에 다시 공급됨으로써 산화로(40)에 공급된 열에너지의 일부가 재활용된다.
At this time, the air heated by the waste heat contained in the exhaust gas discharged from the oxidation furnace 40 while flowing inside the heat exchanger 41 is supplied back to the electric furnace 30 through the air supply line 42, thereby oxidizing the furnace ( Part of the thermal energy supplied to 40) is recycled.

한편, 산화로(40)로부터 배출되는 배기가스 내에는 NOx와 같이 유해가스가 포함되어 있을 수 있으며, 이에 따라 본 발명에서는 산화로(40)의 하류측에 촉매반응로(50)가 설치된다.On the other hand, the exhaust gas discharged from the oxidation furnace 40 may contain noxious gas such as NOx. Accordingly, in the present invention, the catalytic reaction furnace 50 is installed downstream of the oxidation furnace 40.

촉매반응로(50)의 내부에는 선택성 환원촉매(SCR, Selective Catalytic Reduction) 등의 촉매가 구비되어 있으며 이에 의해 배기가스 중의 NOx 등이 효과적으로 제거된다.A catalyst such as a selective reduction catalyst (SCR) is provided inside the catalytic reactor 50, whereby NOx in the exhaust gas is effectively removed.

촉매반응로(50)를 거친 배기가스는 유해가스 등이 제거된 청정의 가스로서 100℃ 이하로 냉각되어 응축된 후 응축수저장용기(60)로 이송되고, 응축되지 않은 기체 상태의 배기가스는 공기 중으로 방출된다.Exhaust gas that has passed through the catalytic reactor 50 is a clean gas from which noxious gases are removed, which is cooled to 100 ° C. or lower, condensed, and then transferred to the condensate storage container 60. Is released into the air.

이때 촉매반응로(50)로부터 배출되는 배기가스의 온도는 200~300℃의 온도범위를 가지는 여전히 고온의 가스로서 이러한 고온의 배출가스가 배출되는 배관에 도 2에서와 같이 열교환기(51)를 설치하여 배기가스로부터 폐열을 회수하여 재사용하는 것이 바람직하다.
At this time, the temperature of the exhaust gas discharged from the catalytic reactor 50 is still a high temperature gas having a temperature range of 200 ~ 300 ℃ as a heat exchanger (51) as shown in FIG. It is preferable to install and recover waste heat from exhaust gas and reuse it.

그리고 응축수저장용기(60)에 저장된 응축수는 배출 조건에 따라 최종적으로 필요한 경우 필터(61)를 거쳐 방류된다.
And the condensate stored in the condensate storage container 60 is discharged through the filter 61 when finally necessary according to the discharge conditions.

이하에서는 상기와 같은 구성으로 이루어진 본 발명의 증기발생기 세정폐액 처리시스템을 이용한 세정폐액 처리방법에 대해 설명한다.
Hereinafter will be described the cleaning waste liquid treatment method using the steam generator cleaning waste liquid treatment system of the present invention having the configuration as described above.

도 4는 본 발명의 세정폐액 처리방법을 나타낸 흐름도로서 이 도면으로부터 알 수 있는 바와 같이 본 발명의 세정폐액 처리방법은 크게 증발농축단계(S100), 세정폐액 보관단계(S200), 열분해단계(S300), 산화단계(S400), 유해가스 제거단계(S500), 그리고 응축 및 저장 단계(S600)를 포함한다.
Figure 4 is a flow chart showing the cleaning waste treatment method of the present invention as can be seen from this figure cleaning waste treatment method of the present invention is largely evaporation concentration step (S100), cleaning waste solution storage step (S200), pyrolysis step (S300) ), Oxidation step (S400), harmful gas removal step (S500), and condensation and storage step (S600).

(1) 증발농축단계(S100)(1) evaporation concentration step (S100)

이 단계는 증기발생기의 2차계통 배관의 내부를 세정할 때 발생되는 세정폐액(1)을 증발농축장치(10)에 저장한 상태에서 진공 증발시켜 세정폐액(1) 속에 포함된 수분을 제거하여 세정폐액(1)을 농축시키는 단계로서 이에 의해 세정폐액(1) 속의 수분이 증발 제거되어 세정폐액(1)은 농도가 진한 농축액으로 된다.
This step is to remove the water contained in the cleaning waste liquid (1) by vacuum evaporation while the cleaning waste liquid (1) generated when cleaning the inside of the secondary system pipe of the steam generator in the evaporation concentrator 10 As a step of concentrating the washing waste liquid 1, the water in the washing waste liquid 1 is evaporated and removed, and the washing waste liquid 1 is concentrated.

(2) 세정폐액 보관단계(S200)(2) cleaning waste liquid storage step (S200)

이 단계는 상기 증발농축단계(S100)에 의해 농축된 세정폐액(1)이 폐액저장탱크(20) 내에 일시적으로 보관되는 단계로서 이에 의해 전체 공정의 진행속도가 조절될 수 있다.
This step is a step in which the washing waste liquid 1 concentrated by the evaporation concentration step S100 is temporarily stored in the waste liquid storage tank 20, whereby the progress speed of the entire process can be controlled.

(3) 열분해단계(S300)(3) pyrolysis step (S300)

이 단계는 세정폐액(1)을 전기로(30)를 사용하여 245~900℃의 온도 범위로 가열하여 열분해시키는 단계로서 이에 의해 세정폐액(1) 속에 포함된 EDTA가 열분해되어 질소, 이산화탄소, 일산화탄소 등의 가스 형태로 변환되어 배출된다.
This step is to thermally decompose the cleaning waste liquid (1) by using an electric furnace 30 to a temperature range of 245 ~ 900 ℃ by which the EDTA contained in the cleaning waste liquid (1) is thermally decomposed to nitrogen, carbon dioxide, carbon monoxide It is converted into gaseous form and discharged.

(4) 산화단계(S400)(4) oxidation step (S400)

이 단계는 상기 열분해단계(S300)에서 완전히 열분해되지 않은 휘발성 유기물을 산화로(40)의 가열기에 의해 500~900℃의 온도 범위로 재차 가열하는 단계로서 이에 의해 전기로(30)에서 완전히 분해되지 않은 유기물 등이 완전히 열분해되어 배출된다. 이때 전기로(30) 내부의 온도는 900℃ 이하로 유지되기 때문에 질소산화물이 발생되지 않는다.
This step is a step of heating the volatile organic material that is not completely pyrolyzed in the pyrolysis step (S300) again to a temperature range of 500 ~ 900 ℃ by the heater of the oxidation furnace 40 is thereby not completely decomposed in the electric furnace (30) Organic matter is completely pyrolyzed and discharged. At this time, since the temperature inside the electric furnace 30 is maintained at 900 ° C or less, nitrogen oxides are not generated.

(5) 유해가스 제거단계(S500)(5) harmful gas removal step (S500)

이 단계는 상기 산화단계(S400)를 거쳐 배출되는 배기가스 내에 존재할 수 있는 NOx와 같이 유해 가스를 SCR 촉매가 구비된 촉매반응로(60) 등에 의해 제거하는 단계이다.
This step is a step of removing the harmful gas, such as NOx that may exist in the exhaust gas discharged through the oxidation step (S400) by the catalytic reactor (60) equipped with the SCR catalyst.

(6) 응축 및 저장단계(S600)(6) condensation and storage step (S600)

이 단계는 상기 유해가스 제거단계(S500)에 의해 배기가스 중의 유해가스가 제거된 청정의 배기가스를 100℃ 이하로 냉각시켜 응축수 상태로 응축수 저장용기(60) 등에 저장하는 단계이다.
This step is a step of cooling the clean exhaust gas from which noxious gas in the exhaust gas is removed by the noxious gas removal step (S500) to 100 ° C. or lower and storing the condensate storage container 60 in the condensate state.

이상 설명한 바와 같이 본 발명은 원자력발전소의 증기발생기 세정과정에서 발생되는 EDTA 화학 세정폐액을 적절한 온도범위에서 열분해시킨 다음, 재차 산화처리 등을 하여 방출되도록 함으로써 질소산화물 등이 발생되는 것을 방지할 수 있는 동시에 EDTA를 안전하고 효과적으로 처리할 수 있다.
As described above, the present invention can thermally decompose an EDTA chemical cleaning waste liquid generated during the steam generator cleaning process of a nuclear power plant in an appropriate temperature range, and then release it by oxidation treatment to prevent nitrogen oxides from occurring. At the same time, EDTA can be handled safely and effectively.

1. 세정폐액 10. 증발농축장치
20. 폐액저장탱크 30. 전기로
31. 프레임 32. 하부케이싱
33. 상부케이싱 34. 폐액가열용기
35. 제1발열체 36. 제2발열체
37. 후드 38. 볼스크류
39. 가이드바 40. 산화로
41. 열교환기 42. 공기공급라인
43. 가열기 50: 촉매반응로
51. 열교환기 60. 응축수저장용기
61. 필터1. Cleaning waste 10. Evaporative concentration device
20. Waste storage tank 30. Electric furnace
31.Frame 32.Lower Casing
33. Upper casing 34. Waste liquid heating container
35. First heating element 36. Second heating element
37.hood 38.ballscrew
39. Guide bar 40. Oxidation furnace
41. Heat Exchanger 42. Air Supply Line
43. Heater 50: Catalytic Reactor
51. Heat exchanger 60. Condensate storage container
61.Filter

Claims (5)

원자력발전소의 증기발생기 2차계통의 전열관 등을 세정할 때 발생되는 세정폐액(1)을 처리하기 위한 세정폐액 처리시스템에 있어서,
세정폐액(1)을 증발 농축시키는 증발농축장치(10)와;
상기 증발농축장치(10)를 거친 세정폐액(1)을 가열하여 열분해시키는 전기로(30)와;
상기 전기로(30)로부터 배출되는 배기가스를 가열 산화시키는 산화로(40)와;
상기 산화로(40)의 하류측에 위치하여 상기 산화로(40)로부터 배출되는 배기가스 중의 유해가스를 제거하는 촉매반응로(50)와;
상기 촉매반응로(50)로부터 배출되는 배기가스를 냉각시켜 응축수 상태로 저장하는 응축수저장용기(60)로 이루어지며,
상기 전기로(30)는,
프레임(31)과;
상기 프레임(31)의 하부에 위치되며, 폐액가열용기(34)와 상기 폐액가열용기(34)의 외면에 설치되는 제1발열체(35)가 구비되는 하부케이싱(32) 및;
상기 하부케이싱(32)의 상부에 위치되며, 그 내부에 제2발열체(36)가 구비되는 상부케이싱(33);으로 이루어지는 것을 특징으로 증기발생기 화학 세정폐액 처리시스템.
In the cleaning waste liquid treatment system for treating the cleaning waste liquid 1 generated when cleaning the heat transfer pipe of the steam generator secondary system of a nuclear power plant,
An evaporation concentrating device 10 for evaporating and concentrating the washing waste liquid 1;
An electric furnace (30) for heating and pyrolyzing the washing waste liquid (1) which has passed through the evaporation concentrating device (10);
An oxidation furnace (40) for heating and oxidizing exhaust gas discharged from the electric furnace (30);
A catalytic reaction furnace (50) positioned downstream of the oxidation furnace (40) to remove noxious gas in the exhaust gas discharged from the oxidation furnace (40);
Condensed water storage container 60 for cooling the exhaust gas discharged from the catalytic reactor (50) to store in the condensate state,
The electric furnace 30,
A frame 31;
A lower casing 32 disposed below the frame 31 and provided with a waste liquid heating container 34 and a first heating element 35 installed on an outer surface of the waste liquid heating container 34;
And an upper casing (33) positioned above the lower casing (32) and having a second heating element (36) therein.
청구항 1에 있어서,
상기 전기로(30)는 그 내부의 온도가 245~900℃로 유지되는 것을 특징으로 증기발생기 화학 세정폐액 처리시스템.
The method according to claim 1,
The electric furnace 30 is the steam generator chemical cleaning waste treatment system, characterized in that the temperature is maintained at 245 ~ 900 ℃.
삭제delete 청구항 1에 있어서,
상기 산화로(40)는 그 내부의 온도가 500~900℃로 유지되는 것을 특징으로 증기발생기 화학 세정폐액 처리시스템.
The method according to claim 1,
The oxidation furnace 40 is steam generator chemical cleaning waste treatment system, characterized in that the temperature is maintained at 500 ~ 900 ℃.
삭제delete
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101224725B1 (en) * 2012-08-03 2013-01-21 한국정수공업 주식회사 Method and apparatus for disposing radioactive wastewater
KR101415173B1 (en) 2012-11-30 2014-07-04 한국원자력연구원 Separation and recovery device for wet waste including radionuclide, and the separation and recovery method using the same
KR101747695B1 (en) 2017-03-27 2017-06-15 세안기술 주식회사 A chemical cleaning liquid waste processing system for processing the chemical cleaning liquid waste caused by chemical cleaning process for the internal of steam generator secondary side in the nuclear power plant and thereof control method

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JPH06130187A (en) * 1992-10-14 1994-05-13 Power Reactor & Nuclear Fuel Dev Corp Method for processing radioactive waste liquid
JP2007090337A (en) 2005-08-30 2007-04-12 Kurita Engineering Co Ltd Method for treating chemical cleaning waste water
KR100919771B1 (en) * 2008-11-18 2009-10-06 한국전력공사 Treatment Process and Equipment of Steam Generator Chemical Cleaning Wastewater Contained Chelate Chemicals and radioactive materials

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JPH06130187A (en) * 1992-10-14 1994-05-13 Power Reactor & Nuclear Fuel Dev Corp Method for processing radioactive waste liquid
JP2007090337A (en) 2005-08-30 2007-04-12 Kurita Engineering Co Ltd Method for treating chemical cleaning waste water
KR100919771B1 (en) * 2008-11-18 2009-10-06 한국전력공사 Treatment Process and Equipment of Steam Generator Chemical Cleaning Wastewater Contained Chelate Chemicals and radioactive materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101224725B1 (en) * 2012-08-03 2013-01-21 한국정수공업 주식회사 Method and apparatus for disposing radioactive wastewater
KR101415173B1 (en) 2012-11-30 2014-07-04 한국원자력연구원 Separation and recovery device for wet waste including radionuclide, and the separation and recovery method using the same
US9604154B2 (en) 2012-11-30 2017-03-28 Korea Atomic Energy Research Institute Separation and recovery device for liquid waste including radionuclide, and separation and recovery method using the same
KR101747695B1 (en) 2017-03-27 2017-06-15 세안기술 주식회사 A chemical cleaning liquid waste processing system for processing the chemical cleaning liquid waste caused by chemical cleaning process for the internal of steam generator secondary side in the nuclear power plant and thereof control method

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