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순산소연소 조건에서 Drop tube furnace를 이용한 운전변수에 따른 석회석의 탈황특성 연구
최욱 ( Wook Choi ),조항대 ( Hang Dae Jo ),최원길 ( Won Kil Choi ),박영성 ( Yeong Sung Park ),길상인 ( Sang In Keel ),이형근 ( Hyung Keun Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.6
순산소연소는 높은 연소 효율과 적은 배가스량, 낮은 질소산화물 농도를 장점으로 하고 있으며 연소온도 조절을 위한 배가스 재순환에 의해 배출되는 연소가스중의 CO2 농도를 95%까지 농축이 가능하므로 석탄 연소설비에 대한 유망한 CCS 기술로 부각되고 있다. 본 연구는 순산소연소 조건에서 배가스의 재순환을 통한 CO2 농도 증가에 기인하는 직접 황화반응이 탈황효율에 미치는 영향을 평가하고 반응온도, CO2 농도, SO2 농도상승이 SO2 제거효율에 미치는 영향과 배가스 중 수분 등이 SO2 제거효율에 미치는 영향을 실험적으로 고찰하였다. 반응온도 1,200 ℃까지 온도 상승에 따라 SO2의 제거효율은 증가하였고 Ca/S비, CO2 농도와 수분이 증가할수록 SO2 제거효율이 증가하였다. 이러한 운전변수는 영향인자 평가를 통하여 Ca/S 비>체류시간>O2농도>반응온도>SO2농도>CO2농도>수분농도의 순으로 탈황반응에 영향을 미치는 것으로 나타났다. 또한 운전변수별 실험결과를 이용하여 로내 건식탈황에 있어서 각 운전변수별 성능 영향인자를 평가할 수 있는 반경험적 모델식을 도출하였다. Oxy-fuel combustion with many advantages such as high combustion efficiency, low flue gas flow rate and low NOx emission has emerged as a promising CCS technology for coal combustion facilities. In this study, the effects of the direct sulfation reaction on SO2 removal efficiency were evaluated in a drop tube furnace under typical oxy-fuel combustion conditions represented by high concentrations of CO2 and SO2 formed by gas recirculation to control furnace combustion temperature. The effects of the operating parameters including the reaction temperature, CO2 concentration, SO2 concentration, Ca/S ratio and humidity on SO2 removal efficiency were investigated experimentally. SO2 removal efficiency increased with reaction temperature up to 1,200 due to promoted calcination of limestone reagent particles. And SO2 removal efficiency increased with SO2 concentrations and the humidity of the bulk gas. The increase of SO2 removal efficiency with CO2 concentrations showed that SO2 removal by limestone was mainly done by the direct sulfation reaction under oxy-fuel combustion conditions. From the impact assessment of operation parameters, it was shown that these parameters have an effects on the desulfurization reaction by the order of the Ca/S ratio > residence time > O2 concentration > reaction temperature > SO2 concentration > CO2 concentration > water vapor. The semi-empirical model equation for to evaluate the effect of the operating parameters on the performance of in-furnace desulfurization for oxy-fuel combustion was established.
DTF를 이용한 순산소연소 조건에서 탈황반응과 CaSO₄ 분해 특성
최욱(Wook Choi),조항대(Hang Dae Jo),최원길(Won Kil Choi),박영성(Yeong Sung Park),길상인(Sang In Keel),이형근(Hyung Keun Lee) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.6
순산소연소 조건하의 로내 탈황공정에서 황화반응 생성물인 CaSO₄의 재분해가 탈황반응에 미치는 영향이 크다. 본 연구에서는 DTF (Drop Tube Furnace)를 이용하여 반응온도, CO₂, O₂, SO₂ 농도 등을 포함한 다양한 실험 변수들이 CaSO₄ 탈황반응에 미치는 영향을 파악하기 위하여 분해반응의 전환율을 측정하고 반응속도를 계산하였다. 반응온도가 상승함에 따라 CaSO₄ 분해반응의 전환율과 반응속도가 증가하였고 O₂가 존재하는 조건에서 CO₂ 농도의 영향은 크지 않았다. 동일한 조건에서 CaSO₄ 분해속도는 O₂ 농도가 감소함에 따라 증가하였으나 SO₂ 농도가 증가함에 따라 감소되었다. In general, the decomposition of CaSO₄ formed by sulfation reaction in the in-furnace desulfurization process using limestone has strong effect on the desulfurization reaction under the oxy-fuel combustion condition. In this study, the conversion rates were measured and reaction rates were calculated in order to investigate the effects of the experimental variables such as temperature and the concentrations of CO₂, O₂, SO₂, on the CaSO₄ decomposition reaction using DTF (Drop Tube Furnace) in the desulfurization reaction. The conversion rate and the reaction rate of CaSO₄ decomposition reaction were increased with reaction temperature. CO₂ concentration has little effect on CaSO₄ decomposition reaction in the presence of O₂. Under the same experimental conditions, the decomposition rate of CaSO₄ was enhanced with the decreasing the O₂ concentration, but vice versa with the increasing of SO₂ concentration.
순산소연소 조건에서 석회석의 소성특성 및 로내탈황에 관한 연구
안영모(Young Mo An),조항대(Hang Dae Jo),최원길(Won Kil Choi),박영성(Yeong Sung Park),길상인(Sang In Keel),이형근(Hyung Keun Lee) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.5
순산소연소 배가스 중 CO₂ 농도는 가스의 재순환으로 인해 95%까지 농축 가능하며, CO₂ 농도가 높은 조건에서 석회석의 소성특성은 기존의 공기 연소와 다르게 나타난다. 본 연구에서는 흡수제로 특성이 다른 세 종류의 국내산 석회석을 이용하여, 소성온도에 따른 석회석의 소성특성에 대해 알아보았다. 또한 흡수제 종류, 반응온도 등의 운전변수가 SO₂ 제거효율에 미치는 영향에 대하여 알아보고, 반응생성물을 포집하여 황 함량을 측정하였다. 소성온도가 증가함에 따라 석회석의 소성율 및 비표면적은 증가하는 경향을 보였으며, 반응온도가 증가함에 따라 SO₂ 제거효율은 증가하였으며 석회석의 종류에 따라 SO₂ 제거효율이 뚜렷한 차이를 보였다. 최고효율 나타낸 석회석 시료에 대한 반응생성물 분석결과 시료 내 황 함량은 약 10% 정도인 것으로 나타났다. In oxy-fuel combustion, CO₂ concentration in the flue gas may be enriched up to 95% owing to the gas recirculation. Under the high CO₂ concentration, the calcination characteristic of limestone is different from that of the conventional air combustion system. In this study, three types of limestone taken from different regions in Korea were used as SO₂ absorbent and their calcination characteristics depending on calcination temperature were investigated. The experiments were performed to examine the effects of operating variables such as absorbent species, reaction temperatures on the SO₂ removal efficiency and reacted limestone particles were captured to examine the sulfur contents. The degree of calcination and the specific surface area increased with calcination temperature and SO₂ removal efficiency increased with reaction temperature. The results showed remarkable difference in SO₂ removal efficiencies between the limestone types. The sulfur content of the reacted limestone with the highest SO₂ removal efficiency was about 10%.
DSI를 이용한 탈황 및 질소산화물 부분산화 반응에 관한 연구
서정학(Jeong-Hak Seo),조항대(Hang-Dae Jo),최원길(Won-Gil Choi),이형근(Hyung-Kun Lee),박영성(Yeong-Seong Park) 대전대학교 환경문제연구소 2014 환경문제연구소 논문집 Vol.18 No.-
The objective of this study is to investigate partial oxidation of NO with desulfurization in dry sorbent injection(DSI) process using dry sorbent and additives. The effect of the main operating variables directly related to desulfurization efficiency has been also tested. These variables are Ca/S ratio, temperature, inlet SO2 concentration and gas flow rate. The experiment was carried out for partial oxidation of NO with desulfurization in dry sorbent injection process using NaClO₂ and CaCl₂. The experimental results showed that partial oxidation of NO with desulfurization was increased in DSI process using little NaClO₂. It was also found that the injection of CaCl₂ was effective in increasing only SO₂ removal efficiency. Increase of SO₂ removal performance and promotion of partial oxidation of NO using the two additives at low temperature was confirmed.
폴리이미드 중공사막을 이용한 혼합기체로부터 H2S 제거 및 CO2/CH4 분리에 관한 연구
박보령 ( Bo Ryong Park ),김대훈 ( Dae Hoon Kim ),조항대 ( Hang Dae Jo ),서용석 ( Yong Seog Seo ),황택성 ( Taek Sung Hwang ),이형근 ( Hyung Keun Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.2
In this study, by using the polymeric membrane separation process, the CO2/CH4 separation and H2S removal from biogas were performed in order to CH4 purification and enrichment for the fuel cell energy source application. Fibers were spun by dry/wet phase inversion method. The module was manufactured by fabricating fibers after surface coating with silicone elastomer. The scanning electron microscopy(SEM) studies showed that the produced fibers typically had an asymmetric structure; a dense top layer supported by a porous, sponge substructure. The permeance of CO2 and CO2/CH4 selectivity increased with pressure and temperature. Mixture gas with increasing pressure and temperature, removal efficiency of the CO2 and H2S were decreased while concentration of CH4 was increased up to 100%. When retentate flow rate was increased with the decreasing of pressure and temperature the CH4 recovery ratio in retentate side was increased while the CH4 purity in retentate side was decreased.