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강새별(Sae Byul Kang),김종진(Jong Jin Kim),오진수(Jin Soo Oh) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We develope a steam generator with very high degree of superheat. The steam generator is a kind of once-through boiler with a superheater using LNG as its heating source. Air and LNG are premixed ahead of a metal fiber type combustor. The steam generator has 48 water tubes to receive heating energy of combustion gas. We adopt a spiral type superheater to convert saturated steam into superheated steam with very high degree of superheat. The experimental results show that the maximum evaporation rate of steam is 38.0 ㎏/h and the temperature of steam is 738℃ when the amount of LNG is 4.0 N㎥/h. The efficiency of the steam generator is up to 89.9% based on LHV (low heating value). Using a gas and emission analyser, CO and NOx concentrations of exhaust gas are measured. The amount of CO in exhaust gas is less than 9 ppm. The steam generator can be used as a drying machine of waste matters, wood, foods and so on.
핀란드 목질계 바이오 에너지 소개 및 Forest Bioenergy 2010
강새별(Sae Byul Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Finland is one of top users of using a bioenergy in the world. About 26 % of the total primary energy consumption and 20 % of the electricity requirements are using from bioenergy that is the highest value in the EU. And one of most important bioenergy of Finland is from wood, such as wood pellet, wood chip, solid wood residues and bark. I want to introduce briefly about Finland renewable industry especially woody biomass. And there was Forest Bioenergy 2010 conference (2010 8.31 ~ 9.4) and FinnMETKO (2010 9.2 ~ 9.4) in Finland about renewable energy and forest industry. There are some national action plan of renewable energy of EU countries and European standard for wood pellet (EN 14961-2) and wood chip and hog (EN 14961) as fuel.
강새별(Sae Byul Kang),김종진(Jong Jin Kim),안준(Joon Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
We develop a heat exchanger modules for a multi-burner boiler. The heat exchanger module is kind of a heat recovery steam generator (HRSG). This heat recovery system has 4 heat exchanger modules. The 1st module consists of 27 bare tubes due to high temperature exhaust gas and the others consist of 27 finned tubes. The maximum steam pressure of each module is 1 ㎫ and tested steam pressure is 0.7 ㎫. In order to test these heat exchanger modules, we make a 0.5t/h flue tube boiler (LNG, 40 Nm3/h). We tested the heat exchanger module with changing the position of each heat exchanger module. We measured the inlet and outlet temperature of each heat exchanger module and calculated the heat exchange rate. The results show that if module C is placed at second stage (the 1st stage is always module O, bare tube module), there is no need to attach an additional heat exchanger module. In this case the exit temperature of module C is low enough to enter an economizer which is more effective in heat recovery than a heat exchanger module.
강새별(Sae Byul Kang),정영종(Youn Jong Chung),이은현(Eun Hyun Lee),윤금중(Gum Jung Yoon) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
We developed a diesel engine cylinder test facility to carry out fatigue lest of engine head by controlling hydraulic pulsating pressure up to 100 Hz. Using a high-pressure pump up to 30 MPa, high pressure servo valves and pressure sensors, a cylinder head fatigue can be performed. This engine head facility can perform a head fatigue lest by 6 times faster than a normal engine durability test whose test time takes usually more than one month. We tested 3 different types of diesel engine heads developed by HMC. The results of fatigue tests show absolutely identical cracks occurred by the engine durability test. By using this diesel engine head fatigue test facility, we can find the fatigue crack positions of newly developed engine cylinder head, shorten developing time of engine cylinder head and design a robust engine cylinder head.