Flame-powered trigger device for activating explosion suppression barrier.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9365, 1991; :1-10
The U.S. Bureau of Mines has developed a flame-radiation-powered trigger device to explosively activate suppression barriers to quench gas and coal dust explosions. The major component of the device is a silicon solar panel, which converts radiation from the developing explosion into electrical energy to initiate an electric detonator, which releases an extinguishing agent into the advancing flame front. Solar panels that are rated to produce 20 w of electrical power when exposed to the sunlight are producing about 200 w when exposed to a full-scale dust explosion. The solar panel is electrically isolated from the detonator by a pressure-sensitive switch until the arrival of the precursor pressure pulse, which always precedes a deflagration. This combination of pressure arming and flame-powered photogenerator prevents false barrier activation and requires no external power supply.
Blast-resistant-structures; Underground-explosions; Solar-panels; Coal-dust; Dust-explosions; Mine-gases; Barriers; Coal-mines; Explosion-proofing; Safety-engineering
IH; Report of Investigations
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9365