Gas mixing device and synthesis gas producing device

Abstract

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 22 a and a second gas supplying section 22 b 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.

1 . A gas mixing device comprising:
 a first gas supplying section via which flammable gas is supplied;   a second gas supplying section via which combustion supporting gas is supplied;   a mixing vessel mixing the flammable gas supplied via said first gas supplying section and the combustion supporting gas supplied via said second gas supplying section, within a combustion range of the gases;   a discharge section via which mixed gas of the flammable gas and the combustion supporting gas is discharged from said mixing vessel; and   packings which are packed in said mixing vessel and which form a large number of narrow gas flow passages in said mixing vessel so as to make velocity of the gas flowing in said mixing vessel higher than burning velocity of the flammable gas and the combustion supporting gas.   
   
   
       2 . The gas mixing device according to  claim 1 , wherein the combustion supporting gas is oxygen-containing gas. 
   
   
       3 . The gas mixing device according to  claim 2 , wherein the flammable gas contains methane as a major component. 
   
   
       4 . The gas mixing device according to  claim 3 , wherein the mixed gas is used to produce synthesis gas containing hydrogen and carbon monoxide as major components by partially oxidizing the methane by the oxygen in the presence of a catalyst. 
   
   
       5 . The gas mixing device according to  claim 1 , wherein said packings are packed up to an upstream side of supply ports of said first supplying section and said second supplying section. 
   
   
       6 . The gas mixing device according to  claim 1 , wherein, in a diffusive mixing area which is an area near the supply ports of said first gas supplying section and said second gas supplying section, by adjusting size of said packings, an average diameter of the large number of narrow gas flow passages is set so as to make velocity of the gas flowing in the diffusive mixing area higher than burning velocity of the flammable gas and the combustion supporting gas in the diffusive mixing area. 
   
   
       7 . The gas mixing device according to  claim 6 , wherein, in an area on a downstream side of the diffusive mixing area, by adjusting size of said packings, an average diameter of the large number of narrow gas flow passages is set so as to make velocity of the gas flowing in the downstream area higher than burning velocity of the flammable gas and the combustion supporting gas in a homogeneous mixture state. 
   
   
       8 . The gas mixing device according to  claim 1 , wherein, in said discharge section, said packings are packed so as to make velocity of the mixed gas flowing in said discharge section higher than burning velocity of the mixed gas at process temperature of a downstream process where the mixed gas is processed. 
   
   
       9 . The gas mixing device according to  claim 1 , wherein said packings are ceramic balls. 
   
   
       10 . The gas mixing device according to  claim 1 , wherein said first gas supplying section and said second gas supplying section are connected to said mixing vessel in a double tube state in which one of said gas supplying sections is an outer tube and the other is an inner tube. 
   
   
       11 . The gas mixing device according to  claim 1 , wherein a baffle member promoting homogeneous mixture of the flammable gas and the combustion supporting gas is provided in said mixing vessel. 
   
   
       12 . A synthesis gas producing device comprising:
 the gas mixing device according to  claim 1  in which flammable gas containing methane as a major component is supplied to the first gas supplying section and oxygen-containing gas is supplied to the second gas supplying section;   a gas processing section provided on a downstream side of said gas mixing device and having a catalyst layer which produces synthesis gas containing hydrogen and carbon monoxide as major components by partially oxidizing the methane by the oxygen; and   a discharge nozzle via which the synthesis gas is discharged from said gas processing section.