Safe emptying system for hydrogen-mixed natural gas pipeline valve chamber

The utility model discloses a safe emptying system for a valve chamber of a hydrogen-mixed natural gas pipeline. The safe emptying system comprises a main line cut-off system, an emptying and emptyingcompensation system and an air replacement system. According to the utility model, the temporary air replacement system is arranged to exhaust air in the emptying pipeline during initial emptying, sothat the safe operation of the initial emptying stage is essentially guaranteed; an emptying rate compensation system is adopted, so that the problem of pressure reduction of an emptying pipe due totoo low medium flow rate caused by pressure reduction in a pipeline in the middle and later periods of emptying is prevented; and meanwhile, a flame arrester is arranged to further improve the anti-backfire performance of the system. According to the utility model, safe emptying of the valve chamber of the hydrogen-mixed natural gas pipeline is realized. On one hand, a facility for isolating air from entering the emptying s