Search | Korea Science

Hazard prediction of coal and gas outburst based on fisher discriminant analysis

Chen, Liang;Wang, Enyuan;Feng, Junjun;Wang, Xiaoran;Li, Xuelong
- Geomechanics and Engineering
- /
- v.13 no.5
- /
- pp.861-879
- /
- 2017
Coal and gas outburst is a serious dynamic disaster that occurs during coal mining and threatens the lives of coal miners. Currently, coal and gas outburst is commonly predicted using single indicator and its critical value. However, single indicator is unable to fully reflect all of the factors impacting outburst risk and has poor prediction accuracy. Therefore, a more accurate prediction method is necessary. In this work, we first analyzed on-site impacting factors and precursors of coal and gas outburst; then, we constructed a Fisher discriminant analysis (FDA) index system using the gas adsorption index of drilling cutting ${\Delta}h_2$, the drilling cutting weight S, the initial velocity of gas emission from borehole q, the thickness of soft coal h, and the maximum ratio of post-blasting gas emission peak to pre-blasting gas emission $B_{max}$; finally, we studied an FDA-based multiple indicators discriminant model of coal and gas outburst, and applied the discriminant model to predict coal and gas outburst. The results showed that the discriminant model has 100% prediction accuracy, even when some conventional indexes are lower than the warning criteria. The FDA method has a broad application prospects in coal and gas outburst prediction.
https://doi.org/10.12989/gae.2017.13.5.861 인용 KSCI

The Economic Feasibility Analysis of 100-MW Power-to-Gas System (100 MW급 Power-to-Gas 시스템의 사전 경제성 분석)

Ko, Areum;Park, Sung-Ho;Kim, Suhyun
- Clean Technology
- /
- v.26 no.1
- /
- pp.55-64
- /
- 2020
According to the Korean Renewable Energy 3020 Implementation Plan, the installation capacity of renewable energy is expected to increase whereas technology for storing excess electricity and stabilizing the power supply of renewable energy sources is extremely required. Power-to-Gas is one of energy storage technologies where electricity is converted into gas fuel such as hydrogen and methane. Basically, Power-to-Gas system could be effectively utilized to store excess electricity generated by an imbalance between supply and demand. In this study, the economic feasibility analysis of Power-to-Gas reflecting the domestic situation was carried out. Total revenue requirement method was utilized to estimate the levelized cost of hydrogen. Validation on the economic analysis method in this study was conducted by comparison of the result, which is published by the International Energy Agency. The levelized cost of hydrogen of a 100-MW Power-to-Gas system reflecting the current economic status in Korea is 8,344 won kg^-1. The sensitivity analysis was carried out, applying the main analysis economic factors such as electricity cost, electrolyser cost, and operating year. Based on the sensitivity analysis, the conditions for economic feasibility were suggested by comparing the cost of producing hydrogen using renewable energy with the cost of producing natural gas reformed hydrogen with carbon capture and storage.
https://doi.org/10.7464/ksct.2020.26.1.55 인용 PDF KSCI

Analysis of Safety Decrees for Gas Safety Management System and its Development (주요선진국의 가스기술기준 체제분석 및 제도개선 발전 모형)

김봉진;강경식
- Journal of the Korea Safety Management & Science
- /
- v.3 no.2
- /
- pp.51-63
- /
- 2001
Korea gas industrial because of received LNG in 1987 was converted by the Gas Safety Management System in relation to city gas, LPG and LNG. Gas accident were caused by treatment problem on the supplier and user, on technical and use management mater, on facilities and goods, and included problem with gas safety connection system. This study is present standard application plan of each department to use planning gas technical standard and gas utilization standard of introduction model than statute for change of self-regulation management system and complicated regulation of examination center and order.
PDF