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최근 국내외에서 지하철 공사현장 가스폭발, 지하 공동구 화재, 지하가 화재 폭발 등 지하공간에서의 사고가 다수 발생하고 있다. 이러한 사고는 재산의 손실 뿐 아니라 전력, 통신망 마비로 도시기능을 무력화시키고, 인명 피해의 대형화를 동반함으로서 도시민의 안전을 위협하고 있다. 따라서 지하공간 중 지하가의 사고 사례와 문헌 연구 및 실태를 조사, 검토하고, 운영 관리 단계에서 위험 요인을 도출하여 안전대책의 평가요소 및 화재예방평가 시스템을 제시하고자 한다. A large number of accidents at an underground place have been happening, including the gas explosion under construction of subway, the fires of underground utility and underground shopping malls, and other explosion, at home and abroad recently. These accidents make the function of a city ineffective due to the paralyses of electricity and communications net as well as the loss of property, and cause people to feel unsecured with accompaniment of a heavy of toll of lives. This study suggests safety assessment items and fire protection assessment technique for underground shopping malls by extracting dangerous elements in the management stage through examination of related accidents, documents and present conditions.
Oxycoal combustion is an alternative technology to the conventional coal-fired power generation, which can directly capture CO₂ from coal combustion with oxygen and recycled flue gas (RFG). Compared to atmospheric oxycoal combustion, the pressurized process has advantages of increased recovery of latent heat and simultaneous NOx/SOx reduction in the flue gas condenser. Due to the increase in the particle concentration proportional to the pressure, however, the reinvention of combustion system is required to minimize the ignition delay and ash deposition while reducing the use of RFG and NOx emission. This study is to develop a design concept for the pressurized oxycoal burner to be used in a 100 kWth test facility. The computational fluid dynamics (CFD) was employed to develop and optimize the design concept by gradually changing the design variables such as the oxidant staging and burner arrangement for oxidant, fuel, and RFG. It was found that the injection of oxidant through nozzles rather than the conventional annular port of a burner is essential to achieve fast mixing and ignition in the burner due to the reduced gas velocity. Deep oxidant staging was helpful for significant suppression of fuel NOx formation. The RFG flow rate was reduced by using it for wall cooling and protection from ash deposition while the pure oxygen was mixed directly with coal for fast ignition and char conversion in a high-temperature flame.
Construction and Demolition(C&D) debris which contain inert substances such as concrete, metals, glasses, soils etc the most are considered the same as Municipal Solid Wastes (MSW) in Korea, dumping together at the sanitary landfills which are designed for MSW, have stiff foundation regulation and cost a lot to build. It makes life-span of the landfills shorter. But Other countries such as USA, EU etc treat C&D separately with MSW by building another landfills only for C&D, which have the requirements less then them of the sanitary landfills and are cost effective. Actually the foundation requirements for the sanitary landfill are very similar between Korea and the US. This study introduces C&D debris disposal facilities and the regulations in the US to think about building new regulation in Korea, which is one of the countries suffering from NIMBY to build environmental facilities. The study found that little consistency exists in the regulation of C&D debris facilities among states in the US. 23 states requires liners, while 27 require groundwater monitoring. 17 states.