KR100686650B1 - Development of reagent solution and additives for the removal of nitric oxides in flue gases using manure waste - Google Patents

Development of reagent solution and additives for the removal of nitric oxides in flue gases using manure waste Download PDF

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KR100686650B1
KR100686650B1 KR1020050109985A KR20050109985A KR100686650B1 KR 100686650 B1 KR100686650 B1 KR 100686650B1 KR 1020050109985 A KR1020050109985 A KR 1020050109985A KR 20050109985 A KR20050109985 A KR 20050109985A KR 100686650 B1 KR100686650 B1 KR 100686650B1
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reducing
nitrogen oxides
solution
manure
removing nitrogen
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유경선
박수엽
이선훈
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유경선
박수엽
이선훈
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/402—Dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)

Abstract

An improved non-catalytic reducing agent for improving the removal efficiency of nitrogen oxides by obtaining an excellent nitrogen oxide removal effect even at high temperatures as well as low temperatures using manure causing a waste treatment problem or a wastewater treatment problem is provided. In a reducing agent for removing nitrogen oxides, a reducing solution preparation for removing nitrogen oxides comprises a solution extracted from manure of living organisms as a principal component. The reducing solution preparation for removing nitrogen oxides comprises a solution extracted from poultry manure as a principal component. The reducing solution preparation for removing nitrogen oxides comprises a solution extracted from fermented poultry manure as a principal component. The reducing solution preparation for removing nitrogen oxides comprises a solution extracted from pig manure as a principal component.

Description

배가스내의 질소산화물 저감을 위한 분뇨폐기물을 이용한 환원용액제재 및 첨가제개발 {Development of reagent solution and additives for the Removal of Nitric Oxides in Flue Gases Using Manure Waste} Development of reagent solution and additives for the removal of Nitric Oxides in Flue Gases Using Manure Waste}

도 1은 계분 추출용액 이용하여 제조한 환원용액제재의 질소산화물 저감효과를 반응온도에 따라 도시한 결과이다.1 is a result showing the effect of reducing the nitrogen oxides of the reducing solution prepared by using the system powder extraction solution according to the reaction temperature.

도 2는 발효계분 추출용액 이용하여 제조한 환원용액제재의 질소산화물 저감효과를 반응온도에 따라 도시한 결과이다.Figure 2 is a result showing the nitrogen oxide reduction effect of the reducing solution prepared by using the fermented meal extract solution according to the reaction temperature.

도 3은 돈분 추출용액 이용하여 제조한 환원용액제재의 질소산화물 저감효과를 반응온도에 따라 도시한 결과이다.Figure 3 is a result showing the nitrogen oxide reduction effect of the reducing solution prepared by using the pig meal extract solution according to the reaction temperature.

본 발명은 질소산화물 저감용 환원용액제제에 관한 것으로서, 더욱 상세하게는 질소산화물에 대한 선택적 무촉매 환원방법(Selective Non-Catalytic Reduction)에서 사용되는 용액으로써, 폐기물로 버려지거나 폐수의 문제를 유발하는 분뇨에서 종래의 환원용액제재 보다 가격이 저렴하면서 우수한 성능을 얻을 수 있어 소각장과 발전소와 같은 질소산화물 배출설비에 용이하게 적용될 수 있는 우수한 성능의 환원용액제재에 관한 것이다.The present invention relates to a reducing solution for reducing nitrogen oxides, and more particularly, as a solution used in a selective non-catalytic reduction method for nitrogen oxides, which is discarded as a waste or causes a problem of waste water. The present invention relates to a high-performance reducing solution material that can be easily applied to nitrogen oxide discharge facilities such as incinerators and power plants because it can be obtained at a lower price than conventional reducing solution materials in manure.

배기가스에 함유된 질소산화물(NOX)은 90% 이상의 일산화질소와 이산화질소 및 아산화질소로 구성되며 지구온난화와 대기오염을 유발하는 대표적인 환경오염물질이다. 아산화질소는 지구 온난화의 주원인 물질중의 하나이며, 일산화질소는 산성비의 원인물질로 작용되며 도시스모그를 유발하고 사람이 호흡기에 흡수되어 기관지염증과 고농도 노출시 사망에 까지 이르게 할 수 있는 유해 성분이다.Nitrogen oxide (NO X ) contained in exhaust gas is composed of more than 90% nitrogen monoxide, nitrogen dioxide and nitrous oxide and is a representative environmental pollutant that causes global warming and air pollution. Nitrous oxide is one of the main sources of global warming. Nitric oxide acts as a causative agent of acid rain, which causes city smog and is absorbed by the human respiratory tract, which can lead to bronchitis and death at high concentrations. .

질소산화물은 화석연료의 고온 연소시 발생되며 이에 따라, 질소산화물 제어기술도 연소조건을 제어하여 배출농도를 저감하는 방법과 연소후 연돌로 배출되기 전에 효과적으로 후처리를 하여 제어하는 기술로 구분된다. 연소조건을 제어하는 방법의 경우 저감농도의 한계와 강화되는 배출허용기준으로 인하여 효과적인 제어방법으로 고려되지 않고 있으며 연소 후처리 기술인 촉매를 이용한 선택적 촉매환원법과 촉매를 이용하지 않는 선택적 무촉매 환원법, 두 가지가 가장 일반적으로 사용되는 기술로 알려져있다.Nitrogen oxides are generated during high-temperature combustion of fossil fuels, and accordingly, the nitrogen oxide control technology is also divided into a method of controlling combustion conditions to reduce the emission concentration and a technique of effectively post-treatment before being discharged into the stack after combustion. The method of controlling the combustion conditions is not considered as an effective control method due to the limit of abatement concentration and the strengthened emission allowance standard, and the selective catalytic reduction method using catalyst which is a post-combustion treatment technique and the selective non-catalytic reduction method without catalyst are used. Eggplant is known as the most commonly used technique.

선택적 무촉매 환원법은 950 ~ 1000oC의 고온영역에 암모니아[미국특허 제3,900,554호]나 요소 수용액[미국특허 제4,119,702호, 미국특허 제4,208,386호]을 직접 분사하여 라디칼 반응을 통하여 질소산화물을 무해한 질소와 수증기로 전환시켜 저감하는 기법이다. 촉매를 이용하는 선택적 촉매환원법은 촉매표면의 활성점에서 환원제의 흡착과 질소산화물간의 반응을 유도하여 무해한 질소와 수증기로 전환시키는 방법으로 전환율은 촉매를 사용하는 선택적 촉매환원법이 우수하며 설치비는 선택적 무촉매 환원법이 우수하다.Selective non-catalytic reduction method is harmless nitrogen oxide via a radical reaction by direct injection of 950 ~ 1000 o ammonia in a high temperature region of the C [US Patent No. 3,900,554 Arc or element solution [U.S. Patent No. 4,119,702 No., U.S. Patent No. 4,208,386 No.] It is a technique to reduce by converting to nitrogen and water vapor. The selective catalytic reduction method using a catalyst induces a reaction between a reducing agent and a nitrogen oxide and converts it into harmless nitrogen and water vapor by inducing the reaction between the reducing agent and the nitrogen oxide at the active surface of the catalyst. The reduction method is excellent.

선택적 무촉매 환원법의 문제점은 주입되는 요소용액이 높은 질소산화물 제거효율을 보이는 작동온도 범위가 900 ∼ 1000oC 사이로 매우 높고 좁다는 것이다. 낮은 온도에서는 라디칼의 형성이 유도되지 않아서 제거효율이 낮아지고 높은 온도에서는 주입된 환원제의 연소속도가 증가하여 질소산화물의 환원반응이 유도되지 않는다는 것이다.The problem with the selective non-catalytic reduction method is that the urea solution being injected has a very high and narrow operating temperature range between 900 and 1000 ° C. with high nitrogen oxide removal efficiency. At low temperatures, radical formation is not induced, resulting in low removal efficiency, and at high temperatures, the combustion rate of the injected reducing agent is increased so that no reduction of nitrogen oxides is induced.

따라서, 상기 문제점을 개선한 종래의 방법으로는, 요소 수용액 분사와 함께 기상첨가제를 사용하는 방법[WO 91/17814], 액상첨가제로 알콜, 설탕, 케톤을 주입하는 방법[WO 91/17814], 암모늄 이온을 포함하는 암모늄카바메이트를 환원제로 사용하는 방법[미국특허 제4,997,631호], 첨가제로서 KOH, NaOH를 이용하는 방법[미국특허 제5,543,123호]등이 제시되었다. 첨가제를 사용하는 방법으로는 암모니아 수용액을 사용하며 수용액에 암모늄카보네이트, 암모늄옥살레이트 등을 액상첨가제로 사용하고 기상첨가제로는 수소, 일산화탄소, 탄화수소를 사용하는 방법[미국특허 제3,900,554호]이 있고, 과산화수소수를 이용하는 방법[미국특허 제4,777,024호]이 있다.Therefore, the conventional method to solve the above problems, a method of using a gaseous additive with the injection of urea aqueous solution [WO 91/17814], a method of injecting alcohol, sugar, ketone with a liquid additive [WO 91/17814], A method of using ammonium carbamate containing ammonium ions as a reducing agent (US Pat. No. 4,997,631), a method using KOH, NaOH as an additive (US Pat. No. 5,543,123), and the like have been proposed. As a method of using an additive, an aqueous ammonia solution is used, and an aqueous solution of ammonium carbonate and ammonium oxalate is used as a liquid additive, and a gaseous additive is hydrogen, carbon monoxide, and a hydrocarbon [US Pat. No. 3,900,554]. There is a method using hydrogen peroxide [US Pat. No. 4,777,024].

그러나, 상기와 같은 종래의 방법들은 대부분 첨가제의 가격이 고가이거나 광범위한 온도범위에서 높은 저감효율을 나타내지 못한다는 단점으로 개선의 여지가 있었다.However, such conventional methods have room for improvement due to the disadvantage that most additives are expensive or do not exhibit high reduction efficiency over a wide temperature range.

이에, 본 발명자들은 상기한 문제점들을 해결하여, 보다 넓은 온도범위에서 높은 NOx 저감율을 유지하는 저렴한 가격의 질소산화물 저감용 환원제를 개발하기 위하여 연구한 결과 폐기물로 처리되어야 하는 분뇨를 이용하여 환원용액제재를 추출하고 이에 소량의 요소를 첨가하면, 요소의 분해에 의하여 발생되는 OH 라디칼의 형성을 보다 낮은 온도에서도 가능하게 하여 저온에서도 질소산화물 제거효율이 급격히 향상되어 폐기물처리나 폐수처리 문제를 유발하는 분뇨를 효과적인 질소산화물 제거용 환원용액제재로 활용할 수 있음을 알게되어 본 발명을 완성하였다.Therefore, the present inventors have solved the above problems, and as a result of research to develop a low-cost reducing agent for reducing nitrogen oxides maintaining a high NOx reduction rate in a wider temperature range as a result of the reduction solution using the manure to be treated as waste Is extracted and a small amount of urea is added. Since the formation of radicals is possible at a lower temperature, the efficiency of nitrogen oxide removal is drastically improved at low temperatures, and it is found that manure, which causes waste treatment or wastewater treatment problems, can be utilized as a reducing solution for removing nitrogen oxide effectively. Completed.

따라서, 본 발명은 종래와 달리 질소산화물의 저감효율을 증대시키기 위하여 폐기물처리나 폐수처리 문제를 유발하는 분뇨를 이용하여 고온 뿐 아니라 저온에서도 질소산화물 저감효과가 우수한 개선된 무촉매 환원제를 제공하는데 그 목적이 있다.Accordingly, the present invention provides an improved catalyst-free reducing agent excellent in reducing nitrogen oxides at high temperature as well as at low temperature by using manure that causes waste treatment or wastewater treatment problems in order to increase the reduction efficiency of nitrogen oxides unlike the conventional arts. There is a purpose.

본 발명은 분뇨폐기물을 이용하여 추출한 용액을 주성분으로 하고 부족한 요소성분을 첨가한 질소산화물 저감용 선택적 무촉매 환원제에 있어서, 환원용액제재 전체 중량중 계분, 발효계분, 돈분의 추출액 함량이 1-95% 사이인 선택적 무촉매 환원제에 그 특징이 있다.The present invention provides a selective non-catalytic reducing agent for reducing nitrogen oxides containing a solution extracted by using manure waste as a main ingredient and insufficient urea, wherein the content of extracts, fermented meals, and pig meals in the total weight of the reducing solution is 1-95. It is characterized by selective non-catalytic reducing agents that are between%.

이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.

본 발명은 연소장치에서 발생되는 질소산화물을 저감하기 위하여 분뇨추출액에 소량의 요소를 첨가하여 제조한 환원용액제재를 연소장치내에 투입함으로써 800oC와 같이 기존의 환원용액제재를 적용하기에는 낮은 반응온도 구간에서도 높은 질소산화물 제거효율을 얻을 수 있는 질소산화물 저감용 선택적 무촉매 환원제에 관한 것이다.The present invention is to reduce the nitrogen oxides generated in the combustion apparatus by adding a small amount of urea to the manure extract liquid into the combustion apparatus by applying a reducing solution in the combustion apparatus, the reaction temperature is low to apply the existing reducing solution, such as 800 ° C. The present invention relates to a selective non-catalyst reducing agent for reducing nitrogen oxides, which can achieve high nitrogen oxide removal efficiency.

본 발명에 따른 질소산화물 저감용 선택적 무촉매 환원제를 그 제조방법에 따라 더욱 구체화하여 설명하면 다음과 같다.The selective non-catalytic reducing agent for reducing nitrogen oxides according to the present invention will be described in more detail according to the preparation method as follows.

먼저, 분뇨추출액을 제조하기 위하여 계분, 축분을 1 ∼ 50 중량%로 물과 혼합하여 반응온도 24시간 교반기를 이용하여 교반한다. 교반이 종결된 슬러리를 감압필터링을 하여 부유물이 없는 추출액을 얻는다. 추출액의 함량을 1-95중량%로 변화시키고, 물은 10 ∼ 90중량%, 요소는 5 ∼ 50중량%로 조절하여 최종 환원용액제재를 완성한다.First, in order to prepare the manure extract, the mixture and axial fraction are mixed with water at 1 to 50% by weight and stirred using a stirrer for a reaction temperature of 24 hours. The slurry after stirring was filtered under reduced pressure to obtain an extract free of suspended solids. Change the content of the extract to 1-95% by weight, adjust water to 10 to 90% by weight, urea to 5 to 50% by weight to complete the final reducing solution formulation.

따라서, 본 발명에 따른 질소산화물 저감용 선택적 무촉매 환원제는 분뇨폐기물에서 추출한 유효성분과 소량의 요소를 이용하여 온도구간 750 ∼ 1050oC 구간에서 효과적인 질소산화물의 저감을 가능하게 할 수 있어 환경오염 제어에 소요되는 비용을 절감할 수 있을 뿐만 아니라 폐기물에 의한 토양이나 수질오염과 같은 이차 오염을 줄일수 있어 환경오염 방지에 매우 효과적으로 대처할 수 있다.Therefore, the selective non-catalytic reducing agent for reducing nitrogen oxides according to the present invention can enable effective reduction of nitrogen oxides at a temperature range of 750 to 1050 o C using an active ingredient and a small amount of elements extracted from the manure waste, thereby controlling environmental pollution. Not only can it reduce the cost, but also reduce the secondary pollution such as soil and water pollution by waste, so it can cope with environmental pollution effectively.

이하, 본 발명을 실시예에 근거하여 더욱 상세하게 설명하겠는바, 본 발명이 실시예에 의하여 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by Examples.

실시예 1Example 1

계분과 물의 비율을 1:1 로 조절한 후 상온에서 24시간 동안 공기와 접촉하지 않도록 밀폐를 유지하며 교반하였다. 교반과정이 종결되면 용액을 300㎛의 mesh로 여과한후 여과액을 다시 원심분리기로 1800rpm으로 20분간 작동시킨후 상등액을 취하여 계분 추출원액을 제조하였다. 계분추출원액과 요소를 질량비 95:5로 혼합하여 최종 질소산화물 환원용액제재를 제조하여 연소로를 모사한 반응기에서 본 발명의 효과를 시험하였다.After adjusting the ratio of the system and water to 1: 1, the mixture was stirred while keeping it in contact with air at room temperature for 24 hours. After the stirring was terminated, the solution was filtered through a 300 μm mesh, and the filtrate was again operated at 1800 rpm for 20 minutes using a centrifuge. Mixing system extract extract and urea were mixed in a mass ratio of 95: 5 to prepare a final nitrogen oxide reducing solution, and the effects of the present invention were tested in a reactor simulating a combustion furnace.

사용된 장치의 구성은 다음과 같다. 반응기는 직경 0.2m, 길이 6m의 고온 내화재(Castable)와 SS304 도관으로 제작되었으며 LPG버너를 사용하여 반응기내부의 온도를 제어하였다. 반응기 내부에서 배연가스와 질소산화물을 공급하고 반응기 측면으로 노즐을 설치하여 질소산화물 환원용액제재를 분무하였다. 반응이 종결된 배연가스는 시료채취관을 통하여 흡입한 후 가스분석기를 이용하여 농도의 변화를 측정하였다.The configuration of the apparatus used is as follows. The reactor was made of 0.2m in diameter, 6m in length, high temperature refractory (Castable) and SS304 conduit, and LPG burner was used to control the temperature inside the reactor. Flue gas and nitrogen oxide were supplied from inside the reactor, and a nozzle was installed at the side of the reactor to spray nitrogen oxide reduction solution. After completing the reaction, the flue gas was sucked through the sampling tube, and the change in concentration was measured using a gas analyzer.

여기서는, 질소산화물 농도는 500 ppm으로 조절하였고 반응온도는 800 ∼ 1000oC 가 되도록 변화시켜 제조된 환원제를 분사하고 저감율을 측정하여 도 1, 2, 3 에 나타내었다.Here, the concentration of nitrogen oxide was adjusted to 500 ppm and the reaction temperature was changed to 800 ~ 1000 o C by spraying a reducing agent prepared and measured the reduction rate is shown in Figures 1, 2, 3.

실시예 2Example 2

발효계분을 이용하여 실시예 1과 동일한 조건으로 제조한 환원용액제재를 분사하여 얻은 결과를 도 2 에 나타내었다.The result obtained by spraying the reducing solution preparation manufactured under the same conditions as in Example 1 using the fermented flour is shown in FIG. 2.

실시예 3Example 3

돈분을 이용하여 실시예 1과 동일한 조건으로 제조한 환원용액제재를 분사하여 얻은 결과를 도 2 에 나타내었다.The result obtained by spraying the reducing solution material manufactured on the same conditions as Example 1 using the pig powder is shown in FIG.

비교예 1Comparative Example 1

물 95g과 요소 5g을 이용하여 환원용액제재를 제조하여 실시예 1과 동일한 조건으로 환원용액제재를 분사하여 얻은 결과를 도 1 에 나타내었다.The result obtained by spraying the reducing solution material using the same conditions as in Example 1 by preparing a reducing solution material using 95 g of water and 5 g of urea is shown in FIG. 1.

상술한 바와 같이, 질소산화물 저감용 환원용액제재는 분뇨폐기물에서 추출한 용액에 일정량의 요소를 추가하여 제조한 것으로, 분뇨추출액내의 금속성분과 유기물의 요소와의 상승작용에 의하여, 800oC 와 같은 저온에서도 라디칼 반응을 화학적으로 촉진하여 고효율의 질소산화물 저감효과를 얻을 수 있으며, 폐기물을 이용하여 유효성분을 추출해냄으로써 경제적이며 동시에 부가적인 환경오염을 방지할 수 있는 질소산화물 환원요액제재로, 자동차 및 각종 산업시설의 NOX 정화용 환원제로 널리 활용될 수 있다.As described above, the reducing solution for reducing nitrogen oxides is prepared by adding a certain amount of urea to a solution extracted from manure waste, and by synergy of metal components and organic urea in the manure extract, such as 800 o C Chemically accelerated radical reaction at low temperature, high efficiency nitrogen oxide reduction effect can be obtained. By extracting active ingredient using waste, it is economical and prevents additional environmental pollution. various industrial facilities can be widely used as a purifying NO X reducing agent.

Claims (4)

질소산화물 저감용 환원제에 있어서, 생물체의 분뇨를 이용하여 추출한 용액을 주성분으로 하는 것을 특징으로 하는 질소산화물 저감용 환원용액제재 Reducing agent for reducing nitrogen oxides, the reducing solution for reducing nitrogen oxides, characterized in that the solution extracted by using the manure of the organism as a main component. 청구항 1에 있어서 계분을 이용하여 추출한 용액을 주성분으로 하는 것을 특징으로 하는 질소산화물 저감용 환원용액제재The reducing solution for reducing nitrogen oxides, characterized in that the solution extracted using the system powder as a main component of claim 1 청구항 1에 있어서 발효계분을 이용하여 추출한 용액을 주성분으로 하는 것을 특징으로 하는 질소산화물 저감용 환원용액제재The reducing solution for reducing nitrogen oxides, characterized in that the solution extracted by using the fermented flour as a main component 청구항 1에 있어서 돈분을 이용하여 추출한 용액을 주성분으로 하는 것을 특징으로 하는 질소산화물 저감용 환원용액제재 The reducing solution for reducing nitrogen oxides, characterized in that the solution extracted using the pig powder as a main component of claim 1
KR1020050109985A 2005-11-17 2005-11-17 Development of reagent solution and additives for the removal of nitric oxides in flue gases using manure waste KR100686650B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100891231B1 (en) 2007-01-25 2009-04-01 유경선 Reduction Reagent Solution For Restricting Production of Nitrous Oxide
KR100899522B1 (en) 2007-01-30 2009-05-26 유경선 Solution Reagent Of Using Stock Farm Excretions and Method for producing the same
WO2018044002A1 (en) * 2016-08-30 2018-03-08 광운대학교 산학협력단 Nitrogen oxide reducing solution using aldol wastewater, and method for preparing same

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KR920011973A (en) * 1990-12-11 1992-07-25 민병욱 Various by-product fertilizer manufacturing methods and devices
KR970064694A (en) * 1997-07-24 1997-10-13 오세웅 Exhaust Gas Purification System Using Selective Catalytic Reduction Method
JPH10244131A (en) 1997-03-06 1998-09-14 Meidensha Corp Denox device
KR20030081231A (en) * 2003-09-16 2003-10-17 박정봉 NOx reduction system by selective catalytic reduction available for urea as reducing agent

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Publication number Priority date Publication date Assignee Title
KR920011973A (en) * 1990-12-11 1992-07-25 민병욱 Various by-product fertilizer manufacturing methods and devices
JPH10244131A (en) 1997-03-06 1998-09-14 Meidensha Corp Denox device
KR970064694A (en) * 1997-07-24 1997-10-13 오세웅 Exhaust Gas Purification System Using Selective Catalytic Reduction Method
KR20030081231A (en) * 2003-09-16 2003-10-17 박정봉 NOx reduction system by selective catalytic reduction available for urea as reducing agent

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100891231B1 (en) 2007-01-25 2009-04-01 유경선 Reduction Reagent Solution For Restricting Production of Nitrous Oxide
KR100899522B1 (en) 2007-01-30 2009-05-26 유경선 Solution Reagent Of Using Stock Farm Excretions and Method for producing the same
WO2018044002A1 (en) * 2016-08-30 2018-03-08 광운대학교 산학협력단 Nitrogen oxide reducing solution using aldol wastewater, and method for preparing same

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