Combined Filter System with Plain Plate Type Collecting Electrodes

Naim Hasolli,Young Ok Park,Ho Kyung Choi 한국대기환경학회 2007 한국대기환경학회 학술대회논문집 Vol.- No.-

Experimental Study on Hydrogen Direct Reduction of Hematite in a Lab Scale Fluidized Bed Reactor by Estimating the Gas Consumption Rate

Naim Hasolli,Seong Min Jeon,Young Ok Park,Yong Ha Kim 한국청정기술학회 2015 청정기술 Vol.21 No.2

수소를 환원제로 사용한 산화철의 유동 환원에서, 환원율에 대한 다양한 공정 변수를 통해 산화철의 하나인 적철광의 환원거동을 면밀히 관찰하였다. 본 연구를 위해 특별히 설계된 실험실 규모의 유동층 장치에서 목적으로 하는 환원 특성에 대한 가스 속도, 환원 시간 및 온도의 최적 값을 평가 하였다. 최적의 환원율을 나타낸 온도는 750 ℃, 환원 시간은 30분이며 이들을 다음의 시험을 위한 시작점으로 매개 변수 값을 설정 하였다. 가장 높은 관심을 갖는 변수들 중 하나는 가스의 소비 원단 위로, 이는 최적의 조건에서 산화철 1톤을 기준하여 90% 이상의 환원율을 달성하기 위해 요구되는 가스의 양을 말한다. 이 매개 변수는 실험실 수준 장치의 스케일 엎에 있어서 중요한 인자이며, 본 연구를 통해 1,500 N㎥ /ton-ore가 산화철이 가장 높은 환원율을 갖기 위한 최적의 가스 소비 원단위 임을 확인하였다. Hematite reduction using hydrogen was conducted and the various process parameters were closely observed. A lab scale fluidized bed unit was designed especially for this study. The optimal values of the gas velocity, reduction time and temperature were evaluated. The values which indicated the highest reduction rate were set as fixed parameters for the following tests starting with the reduction time of 30 minutes and 750 ℃ of temperature. Among these variables the one with the highest interest was the gas specific consumption. It will tell the amount of the gas which is required to achieve a reduction rate of over 90% at the optimal conditions. This parameter is important for the scale up of the lab scale unit. 1,500 N㎥ /ton-ore was found to be the optimal specific gas consumption rate at which the reduction rates exhibit the highest values for hematite.

Evaluation of collection efficiency of the Hi-Filter by comparing the shape of collecting plates

Naim Hasolli,Young Ok Park,Ho Kyung Choi 한국입자에어로졸학회 2007 Particle and Aerosol Research Vol.3 No.4

Collection efficiency of electrostatic precipitator is largely dependent on the collection area of collecting plates and the shape of discharge electrode. The shape of collecting plates and discharge electrode indicate the difference in overall collection efficiency and manufacturing cost. Installing corrugated plates as collecting electrode can contribute to the reduction of particle reentrainment, large collection area and lower manufacturing cost compared with the thin blade collecting plates. Final layout predicts the replacement of the corrugated plates by installing plain plates. The economic review of the cost competitiveness due to the shape of the collecting plates finding the optimum solution is subject of this study.

Experimental Study on Hydrogen Direct Reduction of Hematite in a Lab Scale Fluidized Bed Reactor by Estimating the Gas Consumption Rate

Hasolli, Naim,Jeon, Seong Min,Park, Young Ok,Kim, Yong Ha The Korean Society of Clean Technology 2015 청정기술 Vol.21 No.2

수소를 환원제로 사용한 산화철의 유동 환원에서, 환원율에 대한 다양한 공정 변수를 통해 산화철의 하나인 적철광의 환원 거동을 면밀히 관찰하였다. 본 연구를 위해 특별히 설계된 실험실 규모의 유동층 장치에서 목적으로 하는 환원 특성에 대한 가스 속도, 환원 시간 및 온도의 최적 값을 평가 하였다. 최적의 환원율을 나타낸 온도는 750 ℃, 환원 시간은 30분이며 이들을 다음의 시험을 위한 시작점으로 매개 변수 값을 설정 하였다. 가장 높은 관심을 갖는 변수들 중 하나는 가스의 소비 원단 위로, 이는 최적의 조건에서 산화철 1톤을 기준하여 90% 이상의 환원율을 달성하기 위해 요구되는 가스의 양을 말한다. 이 매개 변수는 실험실 수준 장치의 스케일 엎에 있어서 중요한 인자이며, 본 연구를 통해 1,500 Nm³/ton-ore가 산화철이 가장 높은 환원율을 갖기 위한 최적의 가스 소비 원단위 임을 확인하였다. Hematite reduction using hydrogen was conducted and the various process parameters were closely observed. A lab scale fluidized bed unit was designed especially for this study. The optimal values of the gas velocity, reduction time and temperature were evaluated. The values which indicated the highest reduction rate were set as fixed parameters for the following tests starting with the reduction time of 30 minutes and 750 ℃ of temperature. Among these variables the one with the highest interest was the gas specific consumption. It will tell the amount of the gas which is required to achieve a reduction rate of over 90% at the optimal conditions. This parameter is important for the scale up of the lab scale unit. 1,500 Nm³/ton-ore was found to be the optimal specific gas consumption rate at which the reduction rates exhibit the highest values for hematite.

Multi-layered nonwoven filter media for capture of nanoparticles in HVAC systems

Naim Hasolli,박영옥,김광득 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5

Two samples of multi-layered depth filter media and single layers were prepared for this study. Filtration performance of these samples was evaluated using lab scale test unit with KCl as test aerosol. Filter media samples were composed of three layers, two of them of meltblown fiber layers and one of thermal-bonded microfiber layer. A commercial filter media was used as reference sample to compare the filtration performance. Quality factors were calculated in addition to evaluate the overall filtration performance of the new composite filter media. The results indicate a satisfactory filtration efficiency of the media M2U, over 90% for the studied particle size range. Compared to reference media, new media M2U shows better performance, especially for the particle size greater than 50 nm. Charged (M2U) and uncharged (M2U-2) composite media were tested and results compared with theory calculations. Due to upstream layer of high packing density, the loading tests reveal a tendency of clogging for media M2U. Both media, M1U and M2U, exhibit better filtration performance compared to the reference media RefM and could be applied for collection of nanoparticles in HVAC system by replacing the high grade efficiency filters.

절곡형 세라믹필터를 적용한 Pilot scale 융합형 연소배가스 처리장치의 입자상물질 제거성능 특성

이강산,Naim Hasolli,전성민,이재랑,김광득,황정호,박영옥 한국열환경공학회 2017 한국열환경공학회 학술대회지 Vol. No.

세라믹 캔들필터는 가압유동층 연소발전설비(Pressurized Fluidized Bed Combustion, PFBC)와 석탄가스화복합발전설비(Integrated Gasification Combined Cycle, IGCC), 합성 천연가스 제조공정(Synthetic Natural Gas Manufacturing Process)에서 배출되는 배가스 중에 함유된 입자상물질을 고온조건에서 고도처리하기 위해 적용하여 운용하고 있다. 고온여과에 적용되는 세라믹 캔들필터는 열 및 화학적 저항성과 기계적 충격 저항성이 커 고온조건에서 활용이 가능하다. 기존 섬유필터에 비해 세라믹필터는 고형화되어 있 기 때문에 별도의 지지체가 필요 없어 설치비와 운전비를 현저히 줄일 수 있으며, 약 1,000℃ 와 15기압 이하의 조건에서도 안정적으로 운전이 가능하다. 또한 고온 여과기 술은 냉각장치나 열교환기 등이 필요없는 장점과 고온에서 입자상물질을 완전히 제거 함으로써 배기시설의 후처리를 간단하고 청정 배가스를 고온에서 폐열활용으로 전환할 수 있는 점에서 에너지 절약과 환경오염 저감이 절실히 요청되는 차세대에 필수적인 기술로써 장점을 지니고 있다. 본 연구에서는 기존 세라믹 캔들필터에서 표면강도와 여과성능을 높인 절곡형의 세라 믹필터를 개발하였으며, Pilot scale 융합형 연소배가스 처리장치에 4본을 설치하여, 85 0℃ 운전 조건에서 fly ash의 제거성능특성을 고찰하였다. 실험결과, 절곡형 세라믹필터 의 먼지층 유리효율은 93% 이상 나왔으며, 잔류압력손실은 5회 탈진회수동안 483mmAq가 나왔고, 총괄집진효율은 99.99%이상 나왔다.

Pilot scale 2단 와류혼합 복합세정집진장치의 미세먼지 제거 성능평가

이강산,Naim Hasolli,박영옥,김광득 한국에너지학회 2019 한국에너지공학회 학술발표회 Vol.2019 No.10

여과집진장치에서 압축공기 분사장치의 형상에 따른 먼지층의 유리성능 특성

박영옥,Naim Hasolli 한국대기환경학회 2012 한국대기환경학회 학술대회논문집 Vol.2012 No.5

Optimization fluidization characteristics conditions of nickel oxide for hydrogen reduction by fluidized bed reactor

이재랑,Naim Hasolli,전성민,이강산,김광득,김용하,이관영,박영옥 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.11

We evaluated the optimal conditions for fluidization of nickel oxide (NiO) and its reduction into highpurity Ni during hydrogen reduction in a laboratory-scale fluidized bed reactor. A comparative study was performed through structural shape analysis using scanning electron microscopy (SEM); variance in pressure drop, minimum fluidization velocity, terminal velocity, reduction rate, and mass loss were assessed at temperatures ranging from 400 to 600oC and at 20, 40, and 60min in reaction time. We estimated the sample weight with most active fluidization to be 200g based on the bed diameter of the fluidized bed reactor and height of the stocked material. The optimal conditions for NiO hydrogen reduction were found to be height of sample H to the internal fluidized bed reactor diameter D was H/D=1, reaction temperature of 550oC, reaction time of 60min, superficial gas velocity of 0.011m/s, and pressure drop of 77Pa during fluidization. We determined the best operating conditions for the NiO hydrogen reduction process based on these findings.

Control of Fugitive Fine Coal Particulate Emissions from Coal Handling System at Coal-Fired Power Plants using a Two-Stage Vortex Scrubber

김광득,Naim Hasolli,이강산,이재랑,박영옥 한국대기환경학회 2019 한국대기환경학회지 Vol.35 No.2

Fugitive fine coal particulate is emitted from fuel coal transportation and handling plants at coal fired power plants. Fine coal particulate is emitted as result of the coal processing before feeding it to the combustor for generation of steam. Other particles such as bottom ash and fly ash are emitted from coal combutors. Most of coal fired power plants are applying various technologies, bag filtration and wet scrubbing, to remove the fugitive fine coal particulates. A two-stage vortex scrubber is proposed in this paper. Tests were performed by injecting fly ash particles as a test dust. The vortex scrubber was operated in two modes: no-drain and continuous water drain mode. The system pressure drop was controlled using a flow control unit to operate the scrubber at certain test parameters. The inlet particle concentration maintained at three levels of 0.17, 0.23 and 0.33 g/m3. The particle concentrations were measured at the inlet and outlet of the scrubber. The results shown the high particle collection effieicies with 83.6% for PM1, 97.6% for PM2.5 and 99.1% for PM10 at pressure drop of 230 mmAq and operated in the continuous water drain mode. For the purpose of water-air interface visualization, computational fluid dynamics (CFD) tool Fluent was used. Integral module of the Fluent, called Volume of Fluid (VoF), was used to simulate the two phase system in the water batch drain operation mode.