| 摘要 |
PURPOSE:To add an odorant properly and uniformly even when main gas flow is low, by injecting an odorant into the main gas by use of a highly odored carrier gas. CONSTITUTION:A predetermined amount of a carrier gas is fed through a carrier gas line 2 via a valve 4a controlled by a flow regulator. An odorant in an amt. corresponding to the flow of the carrier gas is fed from a tank 3 by means of a pump 6 for mixing in a mixer 5 to prepare an odorant-contg. carrier gas. The carrier gas is added to the main gas flowing in a miain gas line 1 via a valve 7 controlled by a flow ratio regulator 8 to maintain the odorant content in fuel gas at a predetermined level. Carrier gas which contains an excess amount of odorant is discharged through a buffer gas line 9 (9a is a resistor inserted in the line).
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