| 摘要 |
PROBLEM TO BE SOLVED: To prevent outdoor air or external contaminants from intruding into a reaction pipe from a water discharge pipe for discharging water generated by reaction in a pyrogenic furnace. SOLUTION: This device is provided with a gas discharge port 3 connected to the reaction pipe 1, a discharge pipe 4 connected to the gas discharge port for discharging gas, and the water discharge pipe 5 connected to the gas discharge port for discharging the water generated by the reaction. Also, the water discharge pipe is provided with a part lower than a downstream side on an upstream side.
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