Analysis on the Reason of Suffocation Accidents Caused by Nitrogen Gas in China Coal Mines

摘要

In China coal mines, suffocation accidents caused by nitrogen gas sometimes occurred. For example, in Xuzhou Cacheng coal mime, six workers died in the accidents. According to the theory of geochemistry and geological trait of Cacheng coal mime, it can come to conclusion that the nitrogen gas is originated from oxidation of red bed. During coal formation, nitrogen element in coal-forming material is changed to ammonia gas. When ammonia rises, and contacts with red bed, it will be oxidized to nitrogen gas that is reserved in rock bed. Nitrogen gas can emit into the working place thought the fracture of rock fault, and may result in suffocation accidents.