in recent years, as one of the means of environmental protection, biogas digesters have become more and more common in large-scale farms. they can not only treat farm manure, but also produce gas as fuel. methane, a major component of methane, is an unstable molecule. when methane reaches 7%-26% in the air, it explodes when exposed to flame.
it is understood that the main cause of biogas explosion, a new firedamp pool charging, not correctly on the gas tube ignition test, the gas tank caused by tempering, violent expansion, explosion caused tank rupture; two is a one-off biogas pool of excess material, form a negative pressure tank, then ignition gas, prone to suction phenomenon caused by the flame into the pool, explosion. april 17, 2011, occurred in zhejiang city, jiaxing province nanhu district, phoenix town, a methane tank explosion accident, because the pool negative pressure, ignition explosion.
therefore, to check whether the new methane tank produces methane, the gas pipe is applied to the cooker to test, and the direct ignition test on the air pipe is strictly prohibited. when the inlet and outlet are large, the gas switch should be opened so as to avoid negative pressure and damage the pool. to observe the change of the pressure gauge regularly, if there is negative pressure in the pool, the ignition and gas should be stopped temporarily, and the fermentation material should be added immediately, until the positive pressure appears.
in the process of using biogas, absolutely not allowed in the gas production of biogas digester outlet, inlet guide pipe and etc. using oil lamps, candles, matches, lighters and other fire, nor in the vicinity of the pool or smoking; if you want to use a flashlight or lighting, explosion-proof lamp only. "in order to prevent such accidents, we import and export of marsh gas seal management, strictly control the entrance of personnel," panyu farmers chen ming said.
cleaning biogas digesters caused by methane poisoning is also a common occurrence. after a long period of use, the gas production of the biogas tank will decrease significantly, resulting in insufficient gas supply. in may 19, 2010, hubei province xianfeng county for cleaning before entering the digester, biogas digesters, animal experiments are not small, and any security measures, after a total of 5 people died. "it's dangerous to go down to the gas tank directly, and it's easy to get poisoned."." lianjiang farmers hemou said, "so, we are the removal of biogas digesters waste residue, are directly using slag extraction machine, biogas digesters out of the slurry, no one to go down."."
prior to entry, animal living experiments must be carried out for 15-30 minutes, such as normal animal activity, and the pool can be removed. lower pool personnel, armpit strong safety rope, there are more than 2 people outside the pool protection, and pay attention to observe the safety of personnel in the pool, if there is poisoning, immediately rescued. no fire shall be allowed at the entrance of the pool until the pool is not lit or smoked by the staff in the pool. |
enterprise
