METERING AND MIXING APPARATUS AND METERING AND MIXING METHOD FOR GAS-LIQUID MIXED FLUID

PROBLEM TO BE SOLVED: To provide a metering and mixing apparatus and a metering and mixing method for gas-liquid mixed fluid which can accurately meter the gas-liquid mixed fluid and can mix the fluid with a predetermined ratio.SOLUTION: The metering and mixing apparatus is used for metering and mixing the gas-liquid mixed fluid which comprises a medium and gas contained in the medium and which has pressure areas of different sensitivity to compression. The metering and mixing apparatus includes: tanks 1, 2 for respectively housing the gas-liquid mixed fluid and other fluid; constant delivery pumps 3, 4 for forcibly feeding respective fluids via different routes 10, 12; a converging part 5 where respective fluids are converged; a non-driven mixing device 6 for mixing respective fluids downstream from the converging part 5; and mixing ratio confirmation routes 7, 8 for confirming the mixing ratio of the gas-liquid mixed fluid and other fluid upstream from the converging part 5. The metering and mixing apparatus is designed in such a way that pressure at the converging part 5 upon mixing operation of respective fluids in the mixing device 6 and pressure at the mixing ratio confirmation routes 7, 8 upon confirming operation of a mixing ratio of the gas-liquid mixed fluid and other fluid are within a range of a pressure region having lower sensitivity to compression of the gas-liquid mixed fluid.