• Title/Summary/Keyword: desulfurizer

Search Result 17, Processing Time 0.03 seconds

Maintenance Welding of the Desulfurizer (탈황조의 보수 용접에 관하여)

  • 황근배
    • Journal of Welding and Joining
    • /
    • v.1 no.2
    • /
    • pp.7-11
    • /
    • 1983
  • 본 공장(진해화학주식회사)에서 암모니아는 나프타를 원료로 한 수소와 공기 중의 질소를 합성하여 제조된다. 암모니아 제조 공정 중 메탄가스(CH$_{4}$)와 수소가스(H$_{2}$) 중에 불순물로 존재하는 유화 수소(H$_{2}$S)를 제거시키는 공정이 탈황공정이다. 탈황공정은 산화 아연(ZnO)과 코발트-몰리브덴(Cobalt-Molybdenum) 촉매층에서 이루어지며 탈황공정이 이루어지는 용기를 탈황조(desulfurizer vessel)라 한다. 본 공장에 설치된 탈황조는 1966년에 설치되어 운용되어 왔다. 본 공장의 안전 조업을 위해 초음파 탐상법, 방사선 투과 탐상법, 표면 침투 탐상법으로써 탈황조의 노후도 측정을 행하였다. 탐상 결과 스테인레스 클래드의 모재부 용접선을 따라 균열이 발견되었다. 균열 부위를 깊이 연마하여 용접 결함부를 제거하고 다시 용접을 함으로써 본 탈황조를 연장하여 사용할 수 있었다.

  • PDF

A Study of Hydrodynamics and Reaction Characteristics in Relation to the Desulfurization Temperatures of Zn-Based Solid Sorbent in the Lab-scale High Pressure and High Temperature Desulfurization Process (실험실규모 고온고압건식탈황공정의 수력학적 특성 및 탈황온도에 따른 아연계 탈황제의 반응특성 연구)

  • Kyung, Dae-Hyun;Kim, Jae-Young;Jo, Sung-Ho;Park, Young Cheol;Moon, Jong-Ho;Yi, Chang-Keun;Baek, Jeom-In
    • Korean Chemical Engineering Research
    • /
    • v.50 no.3
    • /
    • pp.492-498
    • /
    • 2012
  • In this study, hydrodynamics such as solid circulation rate and voidage in the desulfurizer and the reaction characteristics of Zn-based solid sorbents were investigated using lab-scale high pressure and high temperature desulfurization process. The continuous HGD (Hot Gas Desulfurization) process consist of a fast fluidized bed type desulfurizer (6.2 m tall pipe of 0.015 m i.d), a bubbling fluidized bed type regenerator (1.6 m tall bed of 0.053 m i.d), a loop-seal and the pressure control valves. The solid circulation rate was measured by varying the slide-gate opening positions, the gas velocities and temperatures of the desulfurizer and the voidage in the desulfurizer was derived by the same way. At the same gas velocities and the same opening positions of the slide gate, the solid circulation rate, which was similar at the temperature of $300^{\circ}C$ and $550^{\circ}C$, was low at those temperatures compared with a room temperature. The voidage in the desulfurizer showed a fast fluidized bed type when the opening positions of the slide gate were 10~20% while that showed a turbulent fluidized bed type when those of slide gate were 30~40%. The reaction characteristics of Zn-based solid sorbent were investigated by different desulfurization temperatures at 20 atm in the continuous operation. The $H_2S$ removal efficiency tended to decrease below the desulfurization temperature of $450^{\circ}C$. Thus, the 10 hour continuous operation has been performed at the desulfurization temperature of $500^{\circ}C$ in order to maintain the high $H_2S$ removal efficiency. During 10 hour continuous operation, the $H_2S$ removal efficiency was above 99.99% because the $H_2S$ concentration after desulfurization was not detected at the inlet $H_2S$ concentration of 5,000 ppmv condition using UV analyzers (Radas2) and the detector tube (GASTEC) which lower detection limit is 1 ppmv.

A CFD Study on the Hydrogen Leakage for Residential Fuel cell System (가정용 연료전지 시스템 내부의 수소 누출에 관한 전산해석)

  • Ahn, Jae-Uk;Chung, Tae-Yong;Shin, Dong-Hoon;Nam, Jin-Hyun;Kim, Young-Gyu;Park, Ju-Won
    • Proceedings of the KSME Conference
    • /
    • 2007.05b
    • /
    • pp.2026-2031
    • /
    • 2007
  • Hydrogen is receiving much research attention as an alternative substitute for hydrocarbon fuels these days due to its cleanliness and renewability. However, hydrogen should be used with caution because of its high propensity for leak and wide flammable range. This study deals with a situation that hydrogen leaks and then forms a flammable mixture inside 1kW class residential fuel cell. The residential fuel cell was modeled as a box-shaped chamber with vent openings at the top and bottom, filled with various components such as reformer, desulfurizer, fuel cell stack and humidifier. Computational fluid dynamics (CFD) was used to simulate the diffusion, buoyant flow and accumulation of leaked hydrogen in the modeled chamber. From the simulation, the risk region vulnerable to flame was identified and the methods to minimize such hazardous region was discussed. When the vent openings are 1% of the total surface, as the quantity of hydrogen leakage increases the risk regions increases accordingly. As the vent openings of the total surface increased from 1% to 2.3%, averaged hydrogen mole fraction is under 1% in the system.

  • PDF

Preliminary study and development of $kW_e$-class liquid fuel based SOFC system (액상 연료 용 $kW_e$급 SOFC 시스템 사전 연구 및 개발)

  • Yoon, Sang-Ho;Kim, Sun-Young;Bae, Joong-Myeon;Baek, Seung-Whan
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2008.10a
    • /
    • pp.21-24
    • /
    • 2008
  • We have developed a $kW_e$ class liquid fuel based solid oxide fuel cell (SOFC) system. Our final target is to develop the 1 $kW_e$ diesel based SOFC system for residential power generator(RPG). In this study, we present the conceptual design of SOFC system. System is composed of hot-box and cold-box. Planar typed SOFC stack, heat exchanger, combustor for stack tail gas, and fuel processor, such as fuel reformer and desulfurizer, are contained in the hot-box. And several balance of plants(BOP), such as fuel suppliers and controller, are contained in the cold-box. Before the SOFC system fabrication, we have already operated the selfsustaining fuel processor, and heat exchange of all heat-related components is simulated using ASPEN HYSYS, because heat maintenance and management in hot-box are important for stable operation of SOFC system. The self-sustained fuel processor was successfully operated for about 250 hours, and heat exchange is enough to operate the SOFC system.

  • PDF

Anaerobic Digester Gas Purification for the Fuel Gas of the Fuel Cell (연료전지 연료가스인 하수처리장 소화가스정제)

  • Lee, Jong-Gyu;Jun, Jae-Ho;Park, Kyu-Ho;Choi, Doo-Sung;Park, Jae-Young
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.18 no.2
    • /
    • pp.164-170
    • /
    • 2007
  • The Tancheon wastewater treatment plant(WWTP) in Seoul using anaerobic digestion to reduce the outlet sludge produces anaerobic digester gas which contains 65% $CH_4$ and 35% $CO_2$. The gas purification equipment was installed and operated to use Anaerobic Digester Gas(ADG) as a fuel for molten carbonate fuel cell(MCFC). The processes consist of the desulfurizer and the adsorption tower to remove $H_2S$ and siloxane in the gas. The gas purification equipment removed virtually over 95% of $H_2S$ and over 99% of siloxane. Results has demonstrated that the fuel cell can produce electrical output and hot water with negligible air emissions of CO, NOx and $SO_2$. The site provides the first opportunity in Korea for demonstrating Molten carbonate fuel cell(MCFC) which the digester gas was applied to the fuel gas.

System configuration and operation for Kerosene-driven SOFC stack (등유 개질가스를 이용한 고체산화물 연료전지 스택의 시스템 구성과 운영)

  • Kim, Sun-Young;Yoon, Sang-Ho;Bae, Joong-Myeon;Yoo, Young-Sung
    • Proceedings of the KSME Conference
    • /
    • 2008.11b
    • /
    • pp.2144-2148
    • /
    • 2008
  • Kerosene-driven solid oxide fuel cell (SOFC) system with reformer, desulfurizer and after-burner was mainly developed for this study. Originally the system was developed for 1kW class SOFC system for residential power generation (RPG) application. As a preliminary study of 1kW class SOFC system operation, a short stack was applied to the system. The short stack consists of 7 cells of $10cm{\times}10cm$ area and was operated at $720^{\circ}C$. The effect of anode inlet gas composition to stack performance was investigated. Firstly, I-V characteristics of SOFC with different fuel of kerosene and hydrogen were studied. Secondly $CH_4$ internal reforming was performed at various anode inlet gas compositions of $H_2$, $CH_4$ and $H_2O$. Through these experiments the effects of each anode inlet gas component to stack performance were analyzed and the significant operating parameters were iscussed.

  • PDF

Development of Biogas Purification System for City Gas Supply (도시가스 용 바이오 가스 정제 시스템 개발)

  • Lee, Hyunjin;Ko, Sang-Wook;Lee, In-Dong;Jung, In Hee;Ko, Jae-Wook
    • Journal of the Korean Institute of Gas
    • /
    • v.23 no.2
    • /
    • pp.61-67
    • /
    • 2019
  • Korea is natural gas importer which imports a lot quantities which 20% of the volume of US exports in 2018. Biogas which can satisfy gas demand and respond effectively to climate change, will be an alternative. However, only 20% of biogas production is sold, which is also not efficient and difficult to use. The purpose of this study develops an optimal purification system for supplying biogas as city gas. We develope an optimal system by analyzing biogas for system selection, finding cases for system design, developing scenario, and developing a cost - benefit tool.

Desirable pH of Slurry in the Desulfurization Absorber for a 200 MW Anthracite Power Plant (200 MW급 무연탄 발전용 탈황 흡수탑에서 적정 슬러리pH)

  • Choi, Hyun-Ho;Yoo, Hoseon
    • Plant Journal
    • /
    • v.16 no.1
    • /
    • pp.38-43
    • /
    • 2020
  • In this study, Seochon Thermal Power Plant No.1 for anthracite coal was tested to find the proper operation range of limestone slurry pH in the absorber tower which can be operated continuously in compliance with the Air Quality Preservation Act and Seocheon Thermal Power Division's internal regulation, sulfur dioxide average emission regulation. When operating the sulfur dioxide concentration [ppm] in the combustion gas flowing into the desulfurization absorption tower at 370, 400, 460 and 550 ppm while the main operating elements such as the flow rate of the combustion gas were fixed, the proper slurry pH Were 4.4, 4.5, 4.8 and 5.1, respectively. Therefore, it is recommended to operate with the correlation equation, RpH=0.004×Cin+2.93 derived using sulfur dioxide and the appropriate slurry pH.

Effects of Different Precursors on the Surface Mn Species Over $MnO_x/TiO_2$ for Low-temperature SCR of NOx with $NH_3$

  • Kim, Jang-Hoon;Yoon, Sang-Hyun;Lee, Hee-Soo
    • Proceedings of the Materials Research Society of Korea Conference
    • /
    • 2011.10a
    • /
    • pp.29.1-29.1
    • /
    • 2011
  • The selective catalytic reduction (SCR) of $MnO_x$ with $NH_3$ is an effective method for the removal of $MnO_x$ from stationary system. The typical catalyst for this method is $V_2O_5-WO_3(MoO_3)/TiO_2$, caused by the high activity and stability. However, This catalyst is active within $300{\sim}400^{\circ}C$ and occurs the pore plugging from the deposition of ammonium sulfate salts on the catalysts surface. It needs to locate the SCR unit after the desulfurizer and electrostatic precipitator without reheating of the flue gas as well as deposition of dust on the catalyst. The manganese oxides supported on titania catalysts have attracted interest because of its high SCR activity at low temperature. The catalytic activity of $MnO_x/TiO_2$ SCR catalyst with different manganese precursors have investigated for low-temperature SCR in terms of structural, morphological, and physico-chemical analyses. The $MnO_x/TiO_2$ were prepared from three different precursors such as manganese nitrate, manganese acetate (II), and manganese acetate (III) by the sol-gel method and then it calcinated at $500^{\circ}C$ for 2 hr. The structural analysis was carried out to identify the phase transition and the change intensity of catalytic activity by various manganese precursors was analyzed by FT-IR and Raman spectroscopy. These different precursors also led to various surface Mn concentrations indicated by SEM. The Mn acetate (III) tends to be more suppressive the crystalline phase (rutile), and it has not only smaller particle size, but also better distributed than the others. It was confirmed that the catalytic activity of MA (III)-$MnO_x/TiO_2$ was the highest among them.

  • PDF

The development of fuel processor for compact fuel cell cogeneration system (소형 열병합 연료전지 연계형 연료처리시스템 개발)

  • Cha, Jung-Eun;Jun, Hee-Kwon;Park, Jung-Joo;Ko, Youn-Taek;Hwang, Jung-Tae;Chang, Won-Chol;Kim, Jin-Young;Kim, Tae-Won;Kim, In-Ki;Jeong, Young-Sik;Kal, Han-Joo;Yung, Wang-Rai;Jung, Woon-Ho
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2009.06a
    • /
    • pp.323-327
    • /
    • 2009
  • To extract hydrogen for stack, fuels such as LPG and LNG were reformed in the fuel processor, which is comprised of desulfurizer, reformer, shift converter, CO remover and steam generator. All elements of fuel processor are integrated in a single package. Highly active catalysts (desulfurizing adsorbent, reforming catalyst, CO shift catalyst, CO removal catalyst) and the various burners were developed and evaluated in this study. The performance of the developed catalysts and the commercial ones was similar. 1 kW, 5 kW class fuel processor systems using the developed catalyst and burner showed efficiency of 75 %(LHV, for LNG). The start-up time of the 1 kW class fuel processor was less than 50 minutes and its volume including insulation was about 30 l. The start-up time of 3 kW and 5 kW class fuel processors with the volume of 90 l and 150 l, respectively, was about 60 minutes. In the case of LPG fuel, efficiency, volume and start-up time of 1kW class fuel processor showed 73 %(LHV), < 60 l and < 60 min, respectively. Advanced fuel processor showed more highly efficiency and shorter start-up time due to the improvement of heat exchanger and operating method. 1 kW and 3 kW class fuel processors have been evaluated for reliability and durability including with on/off test of developed catalysts and burner.

  • PDF