GAS FLOW CONTROL SYSTEM

摘要

1510527 Gas distribution systems FOSTER WHEELER ENERGY CORP 4 Sept 1975 [5 Sept 1974] 36508/75 Heading F4X In a gas flow line wherein excess gas (i.e. a gas purge) from a source such as a petrochemical or refining installation is directed through a line 14 en route to a flare or other burner where the said gas purge is burned, the gas line conveying said gas purge to the burners includes between conduits 20 and 28 thereof a liquid seal such as a tank 22 containing a liquid (e.g. water) and connected to a reservoir 24. The inlet end of the conduit 28 is normally below the liquid level in the tank 22 whereby gas flow to burners 32 via conduit 28 is prevented. In use, any relatively small gas purge from the source is routed via lines 14 and 20a to burner 34. If the quantity of purged gas increases beyond the capacity of burner 34 the excess is routed via vessel 22 wherein as the gas pressure rises, the liquid level is forced down below the end of conduit 28 so allowing gas to flow to burners 32. A charge of inert gas is maintained above the liquid level in tank 22 when no gas is passing therethrough to burners 32. This is to prevent diffusion of air from the burners 32 (when inoperative) into the line 20 via the tank liquid.