Venting system and venting method

Abstract

A vent system (1) according to the present disclosure is a vent system (1) discharging a gas in an underground space (S1) communicating with a ground space (S2) via a pull-up pipe (22, 23), and includes an inert gas cylinder (12) that is disposed in the ground space (S2) and generates an inert gas, an inert gas supply pipe (13) for supplying the inert gas to the underground space (S1), and a gas concentration measurement sensor (14) that measures a concentration of the gas in the underground space (S1).

1 . A vent system discharging a gas in an underground space communicating with a ground space via a pull-up pipe, the vent system comprising:
 an inert gas cylinder disposed in the ground space and configured to generate an inert gas;   an inert gas supply pipe for supplying the inert gas to the underground space; and   a gas concentration measurement sensor configured to measure a concentration of the gas in the underground space.   
     
     
         2 . The vent system according to  claim 1 , wherein the gas concentration measurement sensor measures a concentration of the gas discharged from the underground space into the ground space. 
     
     
         3 . The vent system according to  claim 1 , wherein the inert gas supply pipe is a flexible pipe disposed inside the pull-up pipe. 
     
     
         4 . A venting method executed by a vent system discharging a gas in an underground space communicating with a ground space via a pull-up pipe, the venting method comprising the steps of:
 generating an inert gas in the ground space;   supplying the inert gas into the underground space; and   measuring a concentration of the gas in the underground space.   
     
     
         5 . The venting method according to  claim 4 , wherein the gas concentration measurement sensor measures a concentration of the gas discharged from the underground space into the ground space. 
     
     
         6 . The venting method according to  claim 4 , wherein the inert gas supply pipe is a flexible pipe disposed inside the pull-up pipe. 
     
     
         7 . The vent system according to  claim 1  further comprising:
 a controller that determines whether the gas concentration is equal to or greater than a leakage threshold; and 
 an output interface that displays output information indicating leakage. 
 
     
     
         8 . The vent system according to  claim 7 , wherein the gas leakage detector determines leakage based on whether a difference between internal pressure of a supply-side gas tank and internal pressure of a consumption-side gas tank is equal to or greater than a different threshold. 
     
     
         9 . The venting method according to  claim 4  further comprising:
 determining whether the gas concentration is equal to or greater than a leakage threshold; and 
 displaying output information indicating leakage. 
 
     
     
         10 . The venting method according to  claim 9 , wherein leakage is determined based on whether a difference between internal pressure of a supply-side gas tank and internal pressure of a consumption-side gas tank is equal to or greater than a different threshold.