Process and apparatus for the continuous withdrawal of specimens from a current of a crude gas for purposes of gas analysis

摘要

In a process for obtaining in a continuous operation a specimen gas from a flowing gas current of a pressurized crude gas for analysis purposes, a branch current is withdrawn from the main current in an anisokinetic manner whereupon the branch current of the crude gas is passed through a cooling device and a specimen is then withdrawn from the branch current likewise in an anisokinetic manner and the specimen is subjected to pressure release and filtering prior to passing it into a gas analysis apparatus. The invention also comprises an apparatus for carrying out the above process comprising a passageway for the main crude gas, a branch for withdrawing in anisokinetic manner a partial current of crude gas from the main current, cooling means, duct means for passing said branch current through said cooling means, means for withdrawing a specimen from the branch current in an anisokinetic manner after passing through the cooling means and a pressure release valve and filter means provided in the duct for passing the specimen to a gas analysis device.