34 research outputs found
A CFD Study on flow uniformity of SCR System in 500MW Coal-Fired Power Plants
ํ์๋
ผ๋ฌธ(์์ฌ) -- ์์ธ๋ํ๊ต๋ํ์ : ๊ณตํ์ ๋ฌธ๋ํ์ ์์ฉ๊ณตํ๊ณผ, 2022.2. ํฉ์ํ๋ฐ์ฐฝ์ฐ.Since the Paris Climate Change Accord in 2015, the demand to reduce global greenhouse gas emissions has continued. It was closed in December. Starting with this, the coal-fired power generators are continuously shutting down as a policy of de-coal energy conversion to continuously reduce fine dust emissions from coal-fired power plants, such as environmental power supply and seasonal management system. In particular, 58 coal-fired power plants are in operation in Korea, and the gas turbine combined cycle power plant, which is an alternative to coal-fired power plants, is also required to develop facilities for nitrogen oxide (NOx) removal.
On the other hand, there are 40 power plants with more than 10 years of life remaining, and efforts are being made to increase facility capacity to improve the performance of environmental facilities with the goal of complying with exhaust gas emission standards for the operation of coal-fired power plants.
However, each unit costs a minimum of 100 billion won to a maximum of 300 billion won. Although this seems like a natural measure to satisfy the domestic carbon-neutral policy and respond to changes in the electric power market, it is a method that ignores economic aspects such as investment for facility expansion and securing of land from a companyโs point of view. Environmental facilities for coal-fired power plants include selective catalytic reducing system (SCR), electrostatic precipitators, and desulfurization facilities.
These facilities are reaction methods that remove Nox, Dust, and Sox through chemical and electrical reactions. A method of increasing the reaction efficiency includes a method of increasing the reaction area or maximizing the reaction time by passing an appropriate amount of gas through a predetermined area at an optimum speed. For this, efficiency can be improved by adjusting the guide vane and gas distributor so that the optimal amount of gas can pass through the reactant. That is, the reaction efficiency can be increased only by a method of uniform flow by minimizing gas drift.
In a previous study on this, the efficiency could be improved by measuring the actual speed in the environmental equipment (electric dust collector) to improve the efficiency of the electrostatic precipitator, and then adjusting the gas distribution plate to obtain the RMS(Root Mean Square) value and make it uniform early.
Therefore, in this study, 3D model modeling was carried out based on the Selective Catalytic Reduction (SCR) facility of the 7th and 8th Serise boilers among 500MW class coal-fired power plants in Korea, and the flow
characteristics of exhaust gas were evaluated using computational fluid analysis (CFD). It was verified and proved that the gas flow can be uniformed through the improvement factors (Guide Vane, Mixing Pipe). In addition, through this study, an adjustable (motor power, etc.) guide vane model was proposed to secure the meaning of this study.
In the future, it is expected that it will be able to establish itself as a new technological paradigm for flow analysis in the expansion of thermal power plant environmental facility improvement and research in related fields.2015๋
ํ๋ฆฌ๊ธฐํํ์ฝ(Paris Climate Change Accord) ์ดํ ์ธ๊ณ ์จ์ค๊ฐ์ค ๋ฐฐ์ถ๋ ๊ฐ์ถ์ ์๊ตฌ๊ฐ ๊ณ์๋๊ณ ์์ผ๋ฉฐ, ์ ๋ถ๋ ์ ์ ์ ์๋์ง ์ ํ ๋ฐ ํ์์ค๋ฆฝ ์ ์ฑ
์ ์ถ์งํ์ฌ ๋ณด๋ นํ๋ ฅ 1,2ํธ๊ธฐ๋ฅผ ๊ณํ๋ณด๋ค 2๋
์๋น๊ฒจ 2019๋
12์์ ํ์ํ๋ ์กฐ์น๋ฅผ ์ทจํ๋ค. ์ด๋ฅผ ์์์ผ๋ก ์ํํ๋ ฅ ๋ฏธ์ธ๋จผ์ง ๋ฐฐ์ถ๋์ ์ง์์ ์ผ๋ก ๊ฐ์ถํ๊ธฐ ์ํ ํ์ํ ์๋์ง์ ํ ์ ์ฑ
์ผ๋ก
ํ๊ฒฝ๊ธ์ , ๊ณ์ ๊ด๋ฆฌ์ ๋ฑ์ผ๋ก ์ํํ๋ ฅ ๋ฐ์ ๊ธฐ Shut Down์ด ์ง์์ ์ผ๋ก ์งํ๋๊ณ ์๋ค. ํนํ ๊ตญ๋ด์๋ ์ํํ๋ ฅ๋ฐ์ 58๊ธฐ๊ฐ ์ด์์ค์ ์๊ณ , ์ํํ๋ ฅ๋ฐ์ ์ ๋์ฑ ๋ฐฉ์์ธ ๊ฐ์คํฐ๋น ๋ณตํฉ๋ฐ์ ๋ํ ์ง์์ฐํ๋ฌผ(NOx) ์ ๊ฑฐ๋ฅผ ์ํ ์ค๋น์ ๊ฐ๋ฐ ์๊ตฌ๊ฐ ๊ณ์๋๊ณ ์๋ค. ํํธ 10๋
์ด์ ์๋ช
์ด ๋จ์ ๋ฐ์ ์๋ ์ฝ40๊ธฐ ์ด์์ผ๋ก ๋ฐ์ ์ ํ์ฅ์์๋ ์ํํ๋ ฅ๋ฐ์ ์์ ์ด์์ ์ํด ๋ฐฐ๊ธฐ์ค์ผ๋ฌผ์ง ๋ฐฐ์ถ๊ธฐ์ค ์ค์๋ฅผ ๋ชฉํ๋ก ํ๊ฒฝ์ค๋น ์ฑ๋ฅ๊ฐ์ ๋์ฑ
์ผ๋ก ์ค๋น์ฉ๋ ์ฆ๋์ ๋
ธ๋ ฅ์ ํ๊ณ ์๋ค.
ํ์ง๋ง ํ ํธ๊ธฐ๋น ์ต์ ์ฒ์ต์์ ๋ง๊ฒ๋ ์ผ์ฒ์ต์ ๊ณผ๋ํ ๋น์ฉ์ด ์์๋๋ค. ์ด๋์ ๋ถํ์์ค๋ฆฝ์ ์ฑ
์์ถฉ์กฑํ๊ณ ,์ ๋ ฅ์์ฅ๋ณํ์๋์ํ๊ธฐ์ํ ๋น์ฐํ ์กฐ์น๋ก ๋ณด์ด์ง๋ง ๊ธฐ์
์ธก๋ฉด์์ ๋ณผ๋ ์ค๋น์ฆ์ค์ ์ํ ํฌ์, ๋ถ์งํ๋ณด ๋ฑ ๊ฒฝ์ ์ฑ ์ธก๋ฉด์ ๋ฌด์ํ ๋ฐฉ๋ฒ์ด๋ค.์ํํ๋ ฅ๋ฐ์ ์ ํ๊ฒฝ์ค๋น๋ก๋ ์ ํ์ ์ด๋งคํ์์ (SCR), ์ ๊ธฐ์ง์ง๊ธฐ,ํํฉ์ค๋น๋ฑ์ด์์ผ๋ฉฐ์ด์ค๋น๋ค์ํํ์ ,์ ๊ธฐ์ ๋ฐ์์ํตํ์ฌ NOx, Dust, SOxํ์๋ฐ์ ๊ฑฐํ๋๋ฐ์๋ฒ์ด๋ค.์ด ๋ฐ์ ํจ์จ์ ๋์ด๋ ๋ฐฉ๋ฒ์ ๋ฐ์ ๋ฉด์ ์ ๋ํ๊ฑฐ๋, ์ ํด์ง ๋ฉด์ ์ ์ ์ ํ ์์ ๊ฐ์ค๋ฅผ ์ต์ ์ ์๋๋ก ํต๊ณผ์์ผ ๋ฐ์์๊ฐ์ ์ต๋ํํ๋ ๋ฐฉ๋ฒ์ด ์๋ค. ์ด๋ฅผ ์ํด ๋ฐ์์ฒด์ ์ต์ ์์ ๊ฐ์ค๊ฐ ํต๊ณผํ ์ ์๋๋ก ์๋ด๊น(Guide Vane), ์๋ชจ๋์๊ฐ์ค ํผํฉ๊ธฐ(Mixing Pipe)์ ์กฐ์ ๋ฑ์ ํตํด ํจ์จํฅ์์ ์ด๋ฃฐ ์ ์๋ค. ์ฆ ๊ฐ์คํธ๋ฅ๋ฅผ ์ต์ํํ์ฌ ์ ๋์ ๊ท ์ผํํ๋ ๋ฐฉ๋ฒ๋ง์ผ๋ก ๋ฐ์ ํจ์จ์ ๋์ผ ์ ์๋ค.
์ด์ ๋ํ ์ ํ ์ฐ๊ตฌ์์๋ ์ ๊ธฐ์ง์ง๊ธฐ ํจ์จํฅ์์ ์ํด ํ๊ฒฝ์ค๋น(์ ๊ธฐ์ง์ง๊ธฐ)๋ด ์ค์ ์๋๋ฅผ ์ธก์ ํ์ฌ RMS์ ๊ฐ์ ๊ตฌํ๊ณ ์ด๋ฅธ ๊ท ์ผํ๊ฒ ํ ์ ์๋๋ก ๊ฐ์ค ๋ถํฌํ ์กฐ์ ํ์ฌ ํจ์จ์ ํฅ์ ํ ์ ์์๋ค. ๋ฐ๋ผ์ ๋ณธ ์ฐ๊ตฌ์์๋ ๊ตญ๋ด 500MW๊ธ ์ํํ๋ ฅ๋ฐ์ ์ ์ค 7,8ํธ๊ธฐ์๋ฆฌ์ฆ์ ๋ณด์ผ๋ฌ์ SCR(์ ํ์ ์ด๋งคํ์๋ฒ)์ค๋น๋ฅผ ๊ธฐ๋ฐ์ผ๋ก 3D๋ชจ๋ธ๋ง์ ์งํํ๊ณ ์ ์ฐ์ ์ฒด์ญํํด์(CFD)์ ์ด์ฉํ์ฌ ๋ฐฐ๊ธฐ๊ฐ์ค์ ์ ๋ ํน์ฑ์ ํ์ธํด ๋ณด๊ณ , ๊ฐ์ ์ธ์(Guide Vane, Mixing Pipe, Catalyst)์ ๋ณํ๋ฅผ ํตํด ๊ฐ์ค ์ ๋์ด ๊ท ์ผํ ๋ ์ ์์์ ์ฆ๋ช
ํ์๋ค. ๋ํ ์ด ์ฐ๊ตฌ๋ฅผ ํตํด ์กฐ์ ๊ฐ๋ฅํ(adjustable: ๋ชจํฐ๋๋ ฅ ๋ฑ) ๊ฐ์ด๋ ๋ฒ ์ธ ๋ชจ๋ธ์ ์ ์ํ์ฌ ๋ณธ ์ฐ๊ตฌ์ ์๋ฏธ๋ฅผ ํ๋ณดํ ์ ์์์ผ๋ฉฐ, ํฅํ ํ๋ ฅ๋ฐ์ ์ ํ๊ฒฝ์ค๋น ๊ฐ์ ํ๋์ ๊ด๋ จ ๋ถ์ผ ์ฐ๊ตฌ์ ์์ด ์ ๋ํด์์ ์๋ก์ด ๊ธฐ์ ํจ๋ฌ๋ค์์ผ๋ก ์๋ฆฌ ์ก์ ์ ์์ ๊ฒ์ผ๋ก ์์๋๋ค.I. ์๋ก
1.1 ์ฐ๊ตฌ ๋ฐฐ๊ฒฝ
1.2 ์ฐ๊ตฌ ๋ด์ฉ
1.2.1 ์ฐ๊ตฌ ๋ชฉ์
1.2.2 ์ฐ๊ตฌ ํ์์ฑ
1.3 ์ด๋ก ์ ๋ฐฐ๊ฒฝ
1.3.1 SCR(์ ํ์ ์ด๋งคํ์๋ฒ)
1.3.2 ์ ์ฐ์ ์ฒด์ญํํด์
1.4 ์ฐ๊ตฌ ๋ฐฉ๋ฒ
1.5 ์ฐ๊ตฌ ๋ํฅ
II. ์ ์ฐํด์
2.1 ์คํ ๋ชจ๋ธ
2.2 ๊ฒฉ์ ์์
2.3 ํด์ ๊ธฐ๋ฒ
2.3.1 ๊ฒฝ๊ณ์กฐ๊ฑด
2.3.2 Porous Media ํด์
2.3.3 ์ค๊ณํ๋จ๊ธฐ์ค
III. ํด์๊ฒฐ๊ณผ
3.1 ๋ ํผ๋ฐ์ค ํด์
3.2 ๊ฐ์ ์ ํด์
3.2.1 Additional Guide Vane Cases
3.2.2 Mixing pipe
3.2.3 Additional Vanes + Mixing Pipe
3.2.4 Additional Vanes + Mixing Pipe + Catalyst
IV. ๊ฒฐ๋ก
4.1 ์์ฝ
4.2 ํ์์ฐ๊ตฌ
์ฐธ๊ณ ๋ฌธํ
Abstract์
Study of Food-related Terms Appearing in Eongan Used by the Kimsโ Main Branch Hakbong(้ถดๅณฐๅฎๅฎถ) of the Clan Euiseong(็พฉๅ้ๆฐ)
A study on "Suunjeongbihoeyurok" reflected Jeolla dialect in the early period of 19th Century
๊ตญ์ด์ฌ์๋ฃ์์ ๋น์ธ์ ๋ฐ์ํ ์๋ฃ๋๊ทธ๋ฆฌ ๋ง์ง ์๋ค. ํนํ ํด๋น์ง์ญ ๋ฐฉ์ธ์ ์ ๊ทน์ ์ผ๋ก ๋ฐ์ํ๊ณ ์๋ ์๋ฃ๋ ๋์ฑ ๋๋ฌผ๋ค. ์ ๋ผ ๋น์ธ์ ๊ฒฝ์ฐ๋ ๋คํํ ์ํ๋ณธ
ํ์๋ฆฌ๊ณ ์์ค๋ค์ด ๋น๋์ ์ ๋ผ ๋น์ธ์ ๋น๊ต์ ์ ๋ฐ์ํ๊ณ ์๋ค. ์ด ๋ฌธํ๋ค์ ๋ฐ์๋ ์ ๋ผ ๋น์ธ์ ์์ด ๋ณํ์ ๊ทธ ํน์ฑ์ ์ต์ ์น(1986)์์ ์ฌ์ธต์ ์ผ๋ก ๋ถ์๋์๋ค.
๊ทธ๋ฐ๋ฐ ์ํ๋ณธ ํ์๋ฆฌ๊ณ ์์ค ์๋ฃ๋ค์ ๋ชจ๋ 19์ธ๊ธฐ ํ๊ธฐ ๋ด์ง๋ 20์ธ๊ธฐ ์ด๊ธฐ์ ๊ฐํ๋ ๊ฒ๋ค์ด๋ค. 19์ธ๊ธฐ ์ด๊ธฐ์ ์ ๋ผ ๋น์ธ์ ๋ชจ์ต์ ์๋ ค ์ฃผ๋ ์๋ฃ๋ ๊ทนํ ๋๋ฌผ๋ค.
ํ์๊ฐ ์ด ๋
ผ๋ฌธ์์ ์ฐ๊ตฌํ๊ณ ์ ํ๋ ใ์์ด์ ๋น ํ์ ๋ก(็ก้ฒไบจๆฒๆท้บ้)ใ์ 1826๋
์ ์์ฑ๋ ๋ฌธ์๋ก์๏ผ 18์ธ๊ธฐ ๋ง์์ 19์ธ๊ธฐ ์ด๊ธฐ ๊ฐ์ ์ ๋ผ๋ฐฉ์ธ์ ๋ฐ์ํ ํ์ฌ๋ณธ ์๋ฃ์ด๋ค. ์ด ์ฑ
์ ์ ์ ์๋ ๊ฒฝ์ฃผ ๊น์จ ๊ณ๋ ด๊ตฐํ์ ํ์์ผ๋ก ์ ๋ผ๋ ์์ค์ ์ด์๋ ๊น๋ํ(้ๆจ้กฏ)์ด๋ค. ็ก้ฒไบจ์ ๊ทธ์ ๋นํธ(ํจ์ผ)์ด๋ค. ๊น๋ํ์ 1759๋
11์ 17(์์กฐ 35๋
, ๊ธฐ๋ฌ๋
)์ ํ์ด๋์ 1830๋
(์์กฐ 30๋
, ๊ฒฝ์ธ๋
) 8์ 11์ผ์ ๋์๊ฐ์
จ์ผ๋ฉฐ ํฅ๋
72์ธ์๋ค.
The present study aims at analyzing Korean language historical features of ใSuunjeongbihoeyurokใ written by Kim Nak-hyeon in 1826.
ใSuunjeongbihoeyurokใ is a Hangeul manuscript which reflected Jeolla dialect (limited Jeonbuk Imsil dialect) in the early period of 19th century and was written by Kim Nak-hyeon.
Nak-hyeon in his post that he built by hand to engage in conservation and management of Suunjeong defined three servants while assigned to the fields, a few asked That"s not to say this is self-created. Five pages in the first half of this is in Chinese character; later in ten pages were written in Hangul. For two kinds of documents written in letters are not identical to each other. Hangul sentences of the second half of the Chinese character is not eonhae(่ซบ่งฃ). In other words, it is not translation of the Chinese for the Korean sentences of the second part.
The present study analyzed linguistic consciousness of Kim Nak-hyeon reflected Korean sentence. The results show that there are 3 kinds of hypercorrection related to t-palatalization and which means that he recognized t-palatalization as a noticeable indication of Jeolla dialect. Also, the results indicated that there are unique figures of speech in Korean sentence written by Kim Nak-hyeon.์ด ๋
ผ๋ฌธ์ 2009๋
๋ ๊ฒฝ๋ถ๋ํ๊ต ํ์ ์ฐ๊ตฌ๋น์ ์ํ์ฌ ์ฐ๊ตฌ๋์์
A CFD Study on flow uniformity of SCR System in 500MW Coal-Fired Power Plants
Since the Paris Climate Change Accord in 2015, the demand to reduce global greenhouse gas emissions has continued. It was closed in December. Starting with this, the coal-fired power generators are continuously shutting down as a policy of de-coal energy conversion to continuously reduce fine dust emissions from coal-fired power plants, such as environmental power supply and seasonal management system. In particular, 58 coal-fired power plants are in operation in Korea, and the gas turbine combined cycle power plant, which is an alternative to coal-fired power plants, is also required to develop facilities for nitrogen oxide (NOx) removal.
On the other hand, there are 40 power plants with more than 10 years of life remaining, and efforts are being made to increase facility capacity to improve the performance of environmental facilities with the goal of complying with exhaust gas emission standards for the operation of coal-fired power plants.
However, each unit costs a minimum of 100 billion won to a maximum of 300 billion won. Although this seems like a natural measure to satisfy the domestic carbon-neutral policy and respond to changes in the electric power market, it is a method that ignores economic aspects such as investment for facility expansion and securing of land from a companyโs point of view. Environmental facilities for coal-fired power plants include selective catalytic reducing system (SCR), electrostatic precipitators, and desulfurization facilities.
These facilities are reaction methods that remove Nox, Dust, and Sox through chemical and electrical reactions. A method of increasing the reaction efficiency includes a method of increasing the reaction area or maximizing the reaction time by passing an appropriate amount of gas through a predetermined area at an optimum speed. For this, efficiency can be improved by adjusting the guide vane and gas distributor so that the optimal amount of gas can pass through the reactant. That is, the reaction efficiency can be increased only by a method of uniform flow by minimizing gas drift.
In a previous study on this, the efficiency could be improved by measuring the actual speed in the environmental equipment (electric dust collector) to improve the efficiency of the electrostatic precipitator, and then adjusting the gas distribution plate to obtain the RMS(Root Mean Square) value and make it uniform early.
Therefore, in this study, 3D model modeling was carried out based on the Selective Catalytic Reduction (SCR) facility of the 7th and 8th Serise boilers among 500MW class coal-fired power plants in Korea, and the flow
characteristics of exhaust gas were evaluated using computational fluid analysis (CFD). It was verified and proved that the gas flow can be uniformed through the improvement factors (Guide Vane, Mixing Pipe). In addition, through this study, an adjustable (motor power, etc.) guide vane model was proposed to secure the meaning of this study.
In the future, it is expected that it will be able to establish itself as a new technological paradigm for flow analysis in the expansion of thermal power plant environmental facility improvement and research in related fields.2015๋
ํ๋ฆฌ๊ธฐํํ์ฝ(Paris Climate Change Accord) ์ดํ ์ธ๊ณ ์จ์ค๊ฐ์ค ๋ฐฐ์ถ๋ ๊ฐ์ถ์ ์๊ตฌ๊ฐ ๊ณ์๋๊ณ ์์ผ๋ฉฐ, ์ ๋ถ๋ ์ ์ ์ ์๋์ง ์ ํ ๋ฐ ํ์์ค๋ฆฝ ์ ์ฑ
์ ์ถ์งํ์ฌ ๋ณด๋ นํ๋ ฅ 1,2ํธ๊ธฐ๋ฅผ ๊ณํ๋ณด๋ค 2๋
์๋น๊ฒจ 2019๋
12์์ ํ์ํ๋ ์กฐ์น๋ฅผ ์ทจํ๋ค. ์ด๋ฅผ ์์์ผ๋ก ์ํํ๋ ฅ ๋ฏธ์ธ๋จผ์ง ๋ฐฐ์ถ๋์ ์ง์์ ์ผ๋ก ๊ฐ์ถํ๊ธฐ ์ํ ํ์ํ ์๋์ง์ ํ ์ ์ฑ
์ผ๋ก
ํ๊ฒฝ๊ธ์ , ๊ณ์ ๊ด๋ฆฌ์ ๋ฑ์ผ๋ก ์ํํ๋ ฅ ๋ฐ์ ๊ธฐ Shut Down์ด ์ง์์ ์ผ๋ก ์งํ๋๊ณ ์๋ค. ํนํ ๊ตญ๋ด์๋ ์ํํ๋ ฅ๋ฐ์ 58๊ธฐ๊ฐ ์ด์์ค์ ์๊ณ , ์ํํ๋ ฅ๋ฐ์ ์ ๋์ฑ ๋ฐฉ์์ธ ๊ฐ์คํฐ๋น ๋ณตํฉ๋ฐ์ ๋ํ ์ง์์ฐํ๋ฌผ(NOx) ์ ๊ฑฐ๋ฅผ ์ํ ์ค๋น์ ๊ฐ๋ฐ ์๊ตฌ๊ฐ ๊ณ์๋๊ณ ์๋ค. ํํธ 10๋
์ด์ ์๋ช
์ด ๋จ์ ๋ฐ์ ์๋ ์ฝ40๊ธฐ ์ด์์ผ๋ก ๋ฐ์ ์ ํ์ฅ์์๋ ์ํํ๋ ฅ๋ฐ์ ์์ ์ด์์ ์ํด ๋ฐฐ๊ธฐ์ค์ผ๋ฌผ์ง ๋ฐฐ์ถ๊ธฐ์ค ์ค์๋ฅผ ๋ชฉํ๋ก ํ๊ฒฝ์ค๋น ์ฑ๋ฅ๊ฐ์ ๋์ฑ
์ผ๋ก ์ค๋น์ฉ๋ ์ฆ๋์ ๋
ธ๋ ฅ์ ํ๊ณ ์๋ค.
ํ์ง๋ง ํ ํธ๊ธฐ๋น ์ต์ ์ฒ์ต์์ ๋ง๊ฒ๋ ์ผ์ฒ์ต์ ๊ณผ๋ํ ๋น์ฉ์ด ์์๋๋ค. ์ด๋์ ๋ถํ์์ค๋ฆฝ์ ์ฑ
์์ถฉ์กฑํ๊ณ ,์ ๋ ฅ์์ฅ๋ณํ์๋์ํ๊ธฐ์ํ ๋น์ฐํ ์กฐ์น๋ก ๋ณด์ด์ง๋ง ๊ธฐ์
์ธก๋ฉด์์ ๋ณผ๋ ์ค๋น์ฆ์ค์ ์ํ ํฌ์, ๋ถ์งํ๋ณด ๋ฑ ๊ฒฝ์ ์ฑ ์ธก๋ฉด์ ๋ฌด์ํ ๋ฐฉ๋ฒ์ด๋ค.์ํํ๋ ฅ๋ฐ์ ์ ํ๊ฒฝ์ค๋น๋ก๋ ์ ํ์ ์ด๋งคํ์์ (SCR), ์ ๊ธฐ์ง์ง๊ธฐ,ํํฉ์ค๋น๋ฑ์ด์์ผ๋ฉฐ์ด์ค๋น๋ค์ํํ์ ,์ ๊ธฐ์ ๋ฐ์์ํตํ์ฌ NOx, Dust, SOxํ์๋ฐ์ ๊ฑฐํ๋๋ฐ์๋ฒ์ด๋ค.์ด ๋ฐ์ ํจ์จ์ ๋์ด๋ ๋ฐฉ๋ฒ์ ๋ฐ์ ๋ฉด์ ์ ๋ํ๊ฑฐ๋, ์ ํด์ง ๋ฉด์ ์ ์ ์ ํ ์์ ๊ฐ์ค๋ฅผ ์ต์ ์ ์๋๋ก ํต๊ณผ์์ผ ๋ฐ์์๊ฐ์ ์ต๋ํํ๋ ๋ฐฉ๋ฒ์ด ์๋ค. ์ด๋ฅผ ์ํด ๋ฐ์์ฒด์ ์ต์ ์์ ๊ฐ์ค๊ฐ ํต๊ณผํ ์ ์๋๋ก ์๋ด๊น(Guide Vane), ์๋ชจ๋์๊ฐ์ค ํผํฉ๊ธฐ(Mixing Pipe)์ ์กฐ์ ๋ฑ์ ํตํด ํจ์จํฅ์์ ์ด๋ฃฐ ์ ์๋ค. ์ฆ ๊ฐ์คํธ๋ฅ๋ฅผ ์ต์ํํ์ฌ ์ ๋์ ๊ท ์ผํํ๋ ๋ฐฉ๋ฒ๋ง์ผ๋ก ๋ฐ์ ํจ์จ์ ๋์ผ ์ ์๋ค.
์ด์ ๋ํ ์ ํ ์ฐ๊ตฌ์์๋ ์ ๊ธฐ์ง์ง๊ธฐ ํจ์จํฅ์์ ์ํด ํ๊ฒฝ์ค๋น(์ ๊ธฐ์ง์ง๊ธฐ)๋ด ์ค์ ์๋๋ฅผ ์ธก์ ํ์ฌ RMS์ ๊ฐ์ ๊ตฌํ๊ณ ์ด๋ฅธ ๊ท ์ผํ๊ฒ ํ ์ ์๋๋ก ๊ฐ์ค ๋ถํฌํ ์กฐ์ ํ์ฌ ํจ์จ์ ํฅ์ ํ ์ ์์๋ค. ๋ฐ๋ผ์ ๋ณธ ์ฐ๊ตฌ์์๋ ๊ตญ๋ด 500MW๊ธ ์ํํ๋ ฅ๋ฐ์ ์ ์ค 7,8ํธ๊ธฐ์๋ฆฌ์ฆ์ ๋ณด์ผ๋ฌ์ SCR(์ ํ์ ์ด๋งคํ์๋ฒ)์ค๋น๋ฅผ ๊ธฐ๋ฐ์ผ๋ก 3D๋ชจ๋ธ๋ง์ ์งํํ๊ณ ์ ์ฐ์ ์ฒด์ญํํด์(CFD)์ ์ด์ฉํ์ฌ ๋ฐฐ๊ธฐ๊ฐ์ค์ ์ ๋ ํน์ฑ์ ํ์ธํด ๋ณด๊ณ , ๊ฐ์ ์ธ์(Guide Vane, Mixing Pipe, Catalyst)์ ๋ณํ๋ฅผ ํตํด ๊ฐ์ค ์ ๋์ด ๊ท ์ผํ ๋ ์ ์์์ ์ฆ๋ช
ํ์๋ค. ๋ํ ์ด ์ฐ๊ตฌ๋ฅผ ํตํด ์กฐ์ ๊ฐ๋ฅํ(adjustable: ๋ชจํฐ๋๋ ฅ ๋ฑ) ๊ฐ์ด๋ ๋ฒ ์ธ ๋ชจ๋ธ์ ์ ์ํ์ฌ ๋ณธ ์ฐ๊ตฌ์ ์๋ฏธ๋ฅผ ํ๋ณดํ ์ ์์์ผ๋ฉฐ, ํฅํ ํ๋ ฅ๋ฐ์ ์ ํ๊ฒฝ์ค๋น ๊ฐ์ ํ๋์ ๊ด๋ จ ๋ถ์ผ ์ฐ๊ตฌ์ ์์ด ์ ๋ํด์์ ์๋ก์ด ๊ธฐ์ ํจ๋ฌ๋ค์์ผ๋ก ์๋ฆฌ ์ก์ ์ ์์ ๊ฒ์ผ๋ก ์์๋๋ค.I. ์๋ก
1.1 ์ฐ๊ตฌ ๋ฐฐ๊ฒฝ
1.2 ์ฐ๊ตฌ ๋ด์ฉ
1.2.1 ์ฐ๊ตฌ ๋ชฉ์
1.2.2 ์ฐ๊ตฌ ํ์์ฑ
1.3 ์ด๋ก ์ ๋ฐฐ๊ฒฝ
1.3.1 SCR(์ ํ์ ์ด๋งคํ์๋ฒ)
1.3.2 ์ ์ฐ์ ์ฒด์ญํํด์
1.4 ์ฐ๊ตฌ ๋ฐฉ๋ฒ
1.5 ์ฐ๊ตฌ ๋ํฅ
II. ์ ์ฐํด์
2.1 ์คํ ๋ชจ๋ธ
2.2 ๊ฒฉ์ ์์
2.3 ํด์ ๊ธฐ๋ฒ
2.3.1 ๊ฒฝ๊ณ์กฐ๊ฑด
2.3.2 Porous Media ํด์
2.3.3 ์ค๊ณํ๋จ๊ธฐ์ค
III. ํด์๊ฒฐ๊ณผ
3.1 ๋ ํผ๋ฐ์ค ํด์
3.2 ๊ฐ์ ์ ํด์
3.2.1 Additional Guide Vane Cases
3.2.2 Mixing pipe
3.2.3 Additional Vanes + Mixing Pipe
3.2.4 Additional Vanes + Mixing Pipe + Catalyst
IV. ๊ฒฐ๋ก
4.1 ์์ฝ
4.2 ํ์์ฐ๊ตฌ
์ฐธ๊ณ ๋ฌธํ
Abstract์
Notational system comparison between the first-edition and the revised-edition of Dusi-Eonhae
Study of formation and characteristics of ion deposited silicon oxide/ nitride films at room temperature
Docto
A Study on the Record period of the culinary book JUBANGMUN(้ ๆนๆ) ; From the viewpoint of phonological changes
์ด ๋
ผ๋ฌธ์ 2009๋
1์ 30์ผ์ ์ดํ์ฌ๋์์ ๊ฐ์ต๋ ๊ตญ์ด์ฌํํ ๊ฒจ์ธ์ฐ๊ตฌํ์์ ๋ฐํํ ๋
ผ๋ฌธ์ ๊น๊ณ ๊ณ ์น ๊ฒ์In Jubangmun(้
ๆนๆ), the letter แจ was used as shown in the word like . An examination of the historical Korean literature shows that this letter only began to appear in the mid of the 18th century, and this gives us an initial hint as to the writing period of Jubangmun.
In Jubangmun, the palatalization process of t๏ผสง(ใท๏ผใ
) amounts to 23.8%, totalling its presence in the word-initial and non-initial positions. Comparing this ratio to that of Seouls literature published in the 18th century, we confirm that the record era of Jubangmun was around the mid of the eighteenth century.
The change of sk๏ผkk(ใ
บ๏ผใฒ) at the final consonant clusters in a declinable word also confirms this, since such a changing process has occurred more widely in Jubangmun than in Eumsikdimibang, [which was written in the early eighteenth century.]
The vowel change ส๏ผษจ(ยท๏ผใ
ก) has been detected to occur in Jubangmun. However, the vowel change ส๏ผa(ยท๏ผk) has not. This indicates that the vowel ส(ยท) was still a distinctive sound in the vowel system in the period when Jubangmun was written. This again shows its record status not being in the very last period of the 18th century.
In Jubangmun a change like ani>ai(์๋-๏ผ์์ด-), in which the nasal n was deleted in front of the vowel i in the non-initial word, is detected. n-deletion of this sort began to appear in the early 18th century Yeongnam literature and Gaesucheophaesineo(ๆนไฟฎๆท่งฃๆฐ่ช), a Seoul literature published in 1748.
Based on the above observations, I conclude that the record period of Jubangmun dates as back as to early eighteenth century(about 1700-1735). This conclusion should be invariable irrespective of the dialectal backgrounds of Jugangmun whether it is Gyeongang- or other dialects in southern area of Korea. The crucial piece of evidence for this conclusion comes from the presence of ์์ด-[ai](presumably with a slightly nasalized vowel i) in Jubangmun, the original form of which had been ์๋-[ani]