| 摘要 |
To provide a gas mixing device capable of safely mixing flammable gas containing, for example, methane or the like and combustion supporting gas such as oxygen-containing gas, and a synthesis gas producing device using this gas mixing device. Flammable gas containing methane or the like and combustion supporting gas such as oxygen-containing gas are supplied into a mixing vessel 20 via a first gas supplying section 22a and a second gas supplying section 22b respectively, and these gases are mixed within a combustion range in the vessel 20 to be discharged via a discharge section 24. In the mixing vessel 20, packings 31 to 33 for forming a large number of narrow gas flow passages in the vessel 20 are packed so that velocity of the mixed gas flowing in the vessel 20 becomes higher than burning velocity of the flammable gas and the combustion supporting gas.
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