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공주 축산폐수공공처리장 바이오가스-마이크로터빈 분산발전시스템 경제성 향상에 관한 연구
박정극(Jungkeuk Park),이기철(Kichul Lee),강호(Ho Kang),허광범(Kwangbeom Hur),임상규(Sanggyu Rhim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Korea Electric Power Corporation (KEPCO) has started the nation's first biogas-microturbine project in the city of Gongju as an effort to encourage the utilization of wasted biogas containing useful energy source in the form of CH₄. The goal of the project is to set up the biogas microturbine co-generation system for utilizing biogas as an energy source and improving the economics of the wastewater treatment plant. Biogas pre-treatment system satisfies Capstone's fuel condition requirement with the test result of 99.9% and 90.2% of hydrogen sulphide and ammonia is removal performance. installation of microturbine and manufacture of heat exchanger to warm anaerobic digester has been done successfully. Expected economic profit produced by the system is coming from energy saving including electricity 115,871㎾h/year and heat contained in exhaust gas 579GJ/year. However, the system is needed to upgrade its economics by increasing biogas production and optimizing opereation mode in the future and the feasibility is discussed. Changes in internal recirculation ratio and pre-treatment degree are needed to optimize plant operation and biogas production. For the operation mode, rather than continuous full day operation with the partial load, intense operation during peak demand hours with full load will be needed to increase the efficiency of the system.
직접 및 간접열교환에 따른 연속식 반응기 내 바이오매스 저속열분해 특성에 대한 실험적 연구
박정극(Jungkeuk Park),김상호(Sangho Kim),박진제(Jinje Park),유승한(Seunghan Yu),류창국(Changkook Ryu) 한국연소학회 2019 한국연소학회지 Vol.24 No.3
Biochar from pyrolysis is emerging as a new option for biomass utilization for various purposes including soil amelioration and carbon sequestration. This study investigated the slow pyrolysis characteristics of wood pellet in a continuous reactor varying the heat transfer type (direct and indirect contact) at various temperatures (400~700℃) with different carrier gas compositions (inert, O₂ 2%, and O₂ 4%). Direct contact heat transfer by preheated carrier gas accelerated the heat up of biomass, promoting the pyrolysis process as well as the temperature increase of indirect contact cases. The presence of O₂ in the carrier gas resulted in limited oxidation reactions with pyrolytic vapor, increasing the reactor temperature to 529.4℃ and 591.7℃ at 2% and 4% O₂, respectively, compared to the inert case having a final temperature of 492.4℃. This can be exploited to save the external heat supply but a careful temperature control is required to yield uniform biochar properties. The pyrolysis products from different test conditions were characterized for mass yield and detailed properties of biochar, bio-oil, and non-condensable gases.
소규모 매립가스 자원화를 위한 마이크로터빈 열병합발전 및 유리온실 CO<sub>2</sub> 농도 증가 시스템의 타당성 연구
박정극 ( Jungkeuk Park ),허광범 ( Kwangbeom Hur ),임상규 ( Sanggyu Rhim ),이인화 ( Inhwa Lee ) 한국신재생에너지학회 2009 신재생에너지 Vol.5 No.2
As new small scale LFG (landfill gas) energy project model which can improve economic feasibility limited due to the economy of scale, LFG-Microturbine combined heat and power system with CO<sub>2</sub> fertilization into greenhouses was proposed and investigated including basic design process prior to the system installation at Gwang-ju metro sanitary landfill. The system features CH<sub>4</sub> enrichment for stable microturbine operation, reduction of compressor power consumption and low CO emission, and CO<sub>2</sub> supplement into greenhouse for enhancement plant growth. From many other researches, high CO<sub>2</sub> concentration was found to enhance CO<sub>2</sub> assimilation (also known as photosynthesis reaction) which converts CO<sub>2</sub> and H<sub>2</sub>O to sugar using light energy. For small scale landfills which produce LFG under 3 ㎥/min, among currently available prime movers, microturbine is the most suitable power generation system and its low electric efficiency can be improved with heat recovery. Besides, since its exhaust gas contains very low level of harmful contaminants to plant growth such as NOx, CO and SOx, microturbine exhaust gas is a suitable and economically advantageous CO<sub>2</sub> source for CO<sub>2</sub> fertilization in greenhouse. The LFG-Microturbine combined heat and power generation system with CO<sub>2</sub> fertilization into greenhouse gas to enhance plant growth is technologically and economically feasible and improves economical feasibility compared to other small scale LFG energy project model.
발전용 가스터빈 캔형 연소기 대상 범용 테스트리그 기본설계
박세익(Seik Park),박정극(Jungkeuk Park),이상협(Sanghyup Lee),최낙정(Nakjeong Choi),신주곤(Jugon Shin) 한국연소학회 2022 KOSCOSYMPOSIUM논문집 Vol.2022 No.5
To achieve the goal of carbon neutrality, power generation technology based on carbon-free fuel is emerging. To evaluate the suitability of hydrogen and ammonia combustion in a gas turbine for power generation, the basic design of a medium-pressure combustion test rig was performed to establish a demonstration facility: Basic design includes reviewing the ASME code, standards and various laws related to explosive gases. And mandatory design requirements were also reflected. After the conceptual design of the combustion test rig, including the pressure chamber geometry, thermal stress analysis related to material selection, heat &mass balance, and P&ID were determined. The method for preventing accidents caused by the use of explosive and toxic gases was also reflected in the design.