• Title/Summary/Keyword: $CO_2$ 탈기

Search Result 28, Processing Time 0.025 seconds

A Comparison Study of Alkalinity and Total Carbon Measurements in $CO_2$-rich Water (탄산수의 알칼리도 및 총 탄소 측정방법 비교 연구)

  • Jo, Min-Ki;Chae, Gi-Tak;Koh, Dong-Chan;Yu, Yong-Jae;Choi, Byoung-Young
    • Journal of Soil and Groundwater Environment
    • /
    • v.14 no.3
    • /
    • pp.1-13
    • /
    • 2009
  • Alkalinity and total carbon contents were measured by acid neutralizing titration (ANT), back titration (BT), gravitational weighing (GW), non-dispersive infrared-total carbon (NDIR-TC) methods for assessing precision and accuracy of alkalinity and total carbon concentration in $CO_2$-rich water. Artificial $CO_2$-rich water(ACW: pH 6.3, alkalinity 68.8 meq/L, $HCO_3^-$ 2,235 mg/L) was used for comparing the measurements. When alkalinity measured in 0 hr, percent errors of all measurement were 0~12% and coefficient of variation were less than 4%. As the result of post-hoc analysis after repeated measure analysis of variance (RM-AMOVA), the differences between the pair of methods were not significant (within confidence level of 95%), which indicates that the alkalinity measured by any method could be accurate and precise when it measured just in time of sampling. In addition, alkalinity measured by ANT and NDIR-TC were not change after 24 and 48 hours open to atmosphere, which can be explained by conservative nature of alkalinity although $CO_2$ degas from ACW. On the other hand, alkalinity measured by BT and GW increased after 24 and 48 hours open to atmosphere, which was caused by relatively high concentration of measured total carbon and increasing pH. The comparison between geochemical modeling of $CO_2$ degassing and observed data showed that pH of observed ACW was higher than calculated pH. This can be happen when degassed $CO_2$ does not come out from the solution and/or exist in solution as $CO_{2(g)}$ bubble. In that case, $CO_{2(g)}$ bubble doesn't affect the pH and alkalinity. Thus alkalinity measured by ANT and NDIR-TC could not detect the $CO_2$ bubble although measured alkalinity was similar to the calculated alkalinity. Moreover, total carbon measured by ANT and NDIR-TC could be underestimated. Consequently, it is necessary to compare the alkalinity and total carbon data from various kind of methods and interpret very carefully. This study provide technical information of measurement of dissolve $CO_2$ from $CO_2$-rich water which could be natural analogue of geologic sequestration of $CO_2$.

Control Modelling for Control Optimization of Gas Stripper System (탈기기 계통의 제어최적화를 위한 제어 모델링)

  • Lee, Kwang-Dae;Oh, Eung-Se;Kim, Jong-Won;Jeon, Dang-Hee;Hur, Jung-Won
    • Proceedings of the KIEE Conference
    • /
    • 2008.04a
    • /
    • pp.189-190
    • /
    • 2008
  • 원자력발전소의 탈기기 계통(Gas Stripper System)은 약 $25^{\circ}C$의 순수를 1.2기압, $105^{\circ}C$ 상태를 거쳐서 가스가 없는 상태(탈기)로 만들어 주는 계통이다. 탈기 상태를 유지하면서 지속적으로 순수를 만들기 위해서 본 계통에는 수위와 압력 제어루프가 있다. 탈기 상태에서는 탈기기 탱크내의 유체 상태가 이상(Two Phase)이기 차가운 급수를 사용한 수위와 압력 제어가 어렵다. 본 논문에서는 모델 기반으로 제어 최적화를 하기 위하여 제어 구성 요소들에 대한 제어 모델링 및 검증 과정을 기술한다. 제어모델링은 일반적으로 Parameter Identification 기법을 적용하지만, 유체역학 수식 모델, 운전 데이터, 탱크와 배관의 설계 자료 등을 이용한 경험적 방법을 적용하였으며 운전 데이터를 사용하여 검증하였다.

  • PDF

Estimation of Ammonia Stripping Condition for Adequate Aerobic Liquid-Composting of Swine Manure (돈분뇨의 적합한 호기성 액비화를 위한 암모니아 탈기조건 설정)

  • Son, Bo-Kyoon;Gang, Seong-Gu;Jo, Eun-Ju;Kim, Shin-Do;Lee, Chang-Ju;Kim, Jeong-Ho
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.39 no.2
    • /
    • pp.73-79
    • /
    • 2006
  • Aeration is the most important and indispensable operation unit for the treatment of swine manure using aerobic liquid-composting process. The composting of swine manure depends on biological treatment process, but the highly concentrated ammonia nitrogen is required a pretreatment to expect the appropriate efficiency of the biological treatment process. In this study, pilot experiments have been carried out to estimate of the fit condition about ammonia stripping process as a pretreatment to aerobic liquid- composting. pH adjustment with $Ca(OH)_2$ was economically superior to use of NaOH and optimum pH of ammonia stripping was 12.3, ammonia nitorgen was rapidly removed as pH were increased at $$35^{\circ}C$$. When air stripping is performed before aerobic liquid-stripping, a high initial pH is required for complete ammonia removal and is additional effects such as organic substances, phosphorus, turbidity, and color removal. Stripping process was very efficient in the pretreatment of highly concentrated ammonia nitrogen for composting of swine manure. Emission rate of gaseous ammonia was $0.5355mole\;s^{-1}$ at initial time and $0.0253mole\;s^{-1}$ at finitial time. The fit condition of ammonia stripping in this study were at the temperature of $$35^{\circ}C$$, and the pH of 12.3 during 48 hours.

CO2 Capture Performance of Dry Sorbents Manufactured by Coal Fly Ash (석탄 화력발전소의 비산재를 이용한 건식 CO2 흡수제 제조 및 특성 연구)

  • Lee, Jae Hee;Wee, Jung-Ho
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.35 no.8
    • /
    • pp.547-553
    • /
    • 2013
  • This paper investigates the effect of coal-fired fly ash on dry $CO_2$ sorbents as the supports and additives. For this purpose, various kinds of dry sorbent were manufactured by mixing fly-ash, the primary $CO_2$ absorption components (NaOH and CaO) and water with their different combination. Thereafter, their $CO_2$ absorption performance and the property were analyzed. As a result, variation of absorption efficiency and temperature as well as $CO_2$ desorption of the sorbents are confirmed, which may be primarily ascribed to fly-ash addition to the sorbents. Particularly, fly-ash effect is strongly measured in the sorbent manufactured by mixing all four components (named WNCF sorbents). Absorption efficiency of WNCF sorbents at $550^{\circ}C$ is 35.6% higher than that of flyash free sorbent and desorption is solely observed in WNCF sorbents. Fly-ash in WNCF sorbents leads to increase the dispersity of $CO_2$ absorption components and decrease their particle size in the sorbents. In addition, fly-ash is used as the supports and pozzolanic reaction is hindered by NaOH in WNCF sorbent. Furthermore, $CO_2$ desorption from the sorbents may be due to fly-ash. The interaction between fly-ash and $CO_2$ absorption components substantially attenuate the strength between captured $CO_2$ in CaO and NaOH.

Methane Recovery and Carbon Dioxide Stripping by MEA Solution the Autocirculation Bubble Lift Column Reactor (내부순환식 기포탑 반응기 상에서 MEA (monoethanolamine) 용액에 의한 이산화탄소 분리 및 메탄회수)

  • Lee, In-Hwa;Kim, Sun-Yil;Park, Ju-Young
    • Applied Chemistry for Engineering
    • /
    • v.18 no.3
    • /
    • pp.239-244
    • /
    • 2007
  • For the simultaneous methane recovery and $CO_2$-stripping, we have been developed dual vent auto circulation bubble lift column reactor, and evaluate optimum conditions for monoethanolamine (MEA) solutions as a $CO_2$ absorbent. At the 5 wt% MEA solution, we investigated the pH change during $CO_2$-stripping and absorption reaction, $CO_2$-stripping rate with reaction time, methane recovery efficiency for various inflow rates of air, $CO_2$-stripping rate for flow liquid over flow height, and $CO_2$-stripping dependency on the temperature of absolvent solutions. The suggested optimum conditions for $CO_2$ recovery with MEA in the dual vent auto circulation bubble lift column reactor were 40 mm over flow liquid height, 1.5 L/min of air inflow rate, and $25^{\circ}C$ of absorbent solution temperature.

Gas desorption species and quantity from the hot cathode ionization gauges (열음극 전리 진공게이지의 기체이탈 특성)

  • ;;;I. Arakawa
    • Journal of the Korean Vacuum Society
    • /
    • v.12 no.4
    • /
    • pp.201-206
    • /
    • 2003
  • A residual gas analyzer was used to study the outgassing behavior of stainless steel 304 chamber as a function of bake-out temperature up to $235 ^{\circ}C$ and to identify the gas species evolved during turn on and degassing of the three different types of hot cathode ionization gauges. It was found that $H_2O$, CO, and $H_2O$ were the dominent outgassing species in the vacuum chamber during bake-out but finally $H_2$ and CO(mass 28) persisted at room temperature. Dominant outgassing species were also $H_2$ and $H_2O$ while fuming on the ionizations and then $H_2$,$H_2O$ and CO were found to be the main species degassed gauges. It was appeared that the outgassing species and quantity were not agreed to the three different types of hot cathode ionization gauges.

pH Control of Feed Water for HRSG with Additional Injection of NH3 (암모니아 추가 주입에 의한 배열회수보일러 급수의 수소이온농도 조절)

  • Mok, Yong-kang;Moon, Seung-Jae;Lee, Jae-Heon
    • Plant Journal
    • /
    • v.11 no.2
    • /
    • pp.32-38
    • /
    • 2015
  • This study was conducted on combined cycle power plant consisting of HRSG with integral deaerator type to avoid tube failures of low pressure evaporator tubes. Based on the observation of pH variation at the discharge of boiler feed water pump by continuous pH measurement for a period of time, it was identified that pH of feed water is getting reduced as ammonia is distributed into vapor and liquid depending on the distribution ratio of ammonia in the LP drum after the deaerator. To solve this problem, the counterplan was prepared by reexamination of ammonia injection point and quantity. In conclusion, it was accomplished that 9.2~9.6 is the optimized pH range for boiler feed water by arranging additional piping for ammonia to inject directly to LP drum.

  • PDF

Effects of Packing Materials on the Keeping Freshness of Chinese Chives(Allium Tubersum Rottler) at Low Temperature Storage (부추 저온저장시 선도유지에 미치는 포장재료의 효과)

  • Kim, Chang-Bae;Lee, Suk-Hee;Kim, Jong-Su;Yoon, Jae-Tak;Kim, Tak
    • Food Science and Preservation
    • /
    • v.6 no.3
    • /
    • pp.270-275
    • /
    • 1999
  • During the storage period of chives(Allium Tubersum fouler) at low temperature(4-5$^{\circ}C$), weight loss in chives by the packages of LDPE, p.p and HDPE film was decreased less than 1%, however that of chives unpacked was remarkably increased as time went by. Soluble solids of unpacked chives was decreased from 6.0 to 4.6 $^{\circ}$Brix after 2 weeks storage and that of LDPE film sealed was lessened to 4.9-5.9 $^{\circ}$Brix, the treatment of deaeration showed a tendency to decrease a lot to 4.5-4.7 $^{\circ}$Brix. The vitamin C content of chives unpacked was 37.1mg% at before storage, but after one week decreased very much to 15.2mg%, and that in chives packed by the different methods was visibly lessened after 2 weeks storage. the Vitamin C content in chives processed by deaeration sealing method was lessened compared to that at chives processed by sealing only. In the bag of chives packed by HDPE film had low CO$_2$ and C$_2$H$_4$ concentration and the gas concentration in the bag of chives processed by P.P. film was increased as storage period went by. Conclusively the freshness of chives packaged by LDPE and HDPE film maintained for 3 weeks, at P.P film for 2 weeks, but the marketability of chives unpacked was degraded in 3-4 days.

  • PDF

Changes of carbon-13 Isotope of Dissolved Inorganic Carbon Within Low-pH CO2-rich Water during CO2 Degassing (pH가 낮은 탄산수의 CO2 탈기에 따른 용존탄소동위원소 변화)

  • Chae, Gitak;Yu, Soonyoung;Kim, Chan Yeong;Park, Jinyoung;Bang, Haeun;Lee, Inhye;Koh, Dong-Chan;Shinn, Young Jae;Oh, Jinman
    • Journal of Soil and Groundwater Environment
    • /
    • v.24 no.3
    • /
    • pp.24-35
    • /
    • 2019
  • It is known that ${\delta}^{13}C_{DIC}$ (carbon-13 isotope of dissolved inorganic carbonate (DIC) ions) of water increases when dissolved $CO_2$ degases. However, ${\delta}^{13}C_{DIC}$ could decrease when the pH of water is lower than 5.5 at the early stage of degassing. Laboratory experiments were performed to observe the changes of ${\delta}^{13}C_{DIC}$ as $CO_2$ degassed from three different artificial $CO_2$-rich waters (ACWs) in which the initial pH was 4.9, 5.4, and 6.4, respectively. The pH, alkalinity and ${\delta}^{13}C_{DIC}$ were measured until 240 hours after degassing began and those data were compared with kinetic isotope fractionation calculations. Furthermore, same experiment was conducted with the natural $CO_2$-rich water (pH 4.9) from Daepyeong, Sejong City. As a result of experiments, we could observe the decrease of DIC and increase of pH as the degassing progressed. ACW with an initial pH of 6.4, ${\delta}^{13}C_{DIC}$ kept increasing but, in cases where the initial pH was lower than 5.5, ${\delta}^{13}C_{DIC}$ decreased until 6 hours. After 6 hours ${\delta}^{13}C_{DIC}$ increased within all cases because the $CO_2$ degassing caused pH increase and subsequently the ratio of $HCO_3{^-}$ in solution. In the early stage of $CO_2$ degassing, the laboratory measurements were well matched with the calculations, but after about 48 hours, the experiment results were deviated from the calculations, probably due to the equilibrium interaction with the atmosphere and precipitation of carbonates. The result of this study may be not applicable to all natural environments because the pressure and $CO_2$ concentration in headspace of reaction vessels was not maintained constant as well as the temperature. Nevertheless, this study provides fundamental knowledge on the ${\delta}^{13}C_{DIC}$ evolution during $CO_2$ degassing, and therefore it can be utilized in the studies about carbonated water with low pH and the monitoring of geologic carbon sequestration.

Effect of Carbonic Anhydrase on CO2 Absorption in Amine Solutions for CO2 Capture (CO2 포집용 아민 흡수제에서 탄산무수화 효소가 CO2 흡수에 미치는 영향)

  • Lee, In-Young;Kwak, No-Sang
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.39 no.11
    • /
    • pp.607-612
    • /
    • 2017
  • The effect of carbonic anhydrase on $CO_2$ absorption rates and the heat of reaction were evaluated in various amine solutions for post combustion $CO_2$ capture process. The $CO_2$ absorption rate was analyzed in 30 wt% MEA, AMP, DMEA, MDEA aqueous solutions with and without carbonic anhydrase (250 mg/L) from bovine erythrocyte. $CO_2$ absorption rates were increased in all solutions with carbonic anhydrase. The effect of carbonic anhydrase on absorption rates was more in tertiary amine (DMEA and MDEA) solutions than in primary amine (MEA) and hindered amine (AMP) solutions. The heat of reaction of MEA, DMEA, MDEA aqueous solutions with and without carbonic anhydrase were measured using reaction calorimeter. Carbonic anhydrase decreased the heat of absorption in all solutions. The results suggested that tertiary amines that have the excellent desorption ability were suitable for applying carbonic anhydrase to the post combustion $CO_2$ capture process and the effect of carbonic anhydrase was best in MDEA solution.