Gas purification apparatus and gas purification method
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsYudai Kato, Kentaro Nakamura
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Abstract
The present invention is intended to provide a gas purification apparatus and a gas purification method with an excellent thermal efficiency and capable of degrading COS at a high degradation rate. A gas purification apparatus configured to purify gas at least including COS, H2O, CO2, and H2S includes a COS treatment device which is provided with a COS conversion catalyst and configured to treat and degrade COS in the gas by hydrolysis, and H2O adjustment means configured to adjust the concentration of H2O in the gas to be introduced into the COS treatment device.
Claims8
A gas purification apparatus configured to purify gas including COS, H2O, CO2, and H2S, the apparatus comprising:
- a COS treatment device comprising a COS conversion catalyst and configured to degrade COS in the gas by hydrolyzing;
- H2O adjustment means configured to adjust a concentration of H2O in the gas to be introduced into the COS treatment device;
- a coal drying device configured to dry coal by removing moisture from the coal;
- a gasification furnace configured to gasify the dried coal;
- at least two water washing devices in the flowing direction of the gas configured to treat the gas discharged from the COS treatment device with water;
- and
- at least two waste water treatment devices, each disposed with one of the at least two water washing devices, the at least two waste water treatment devices configured to treat waste water drained from the at least two water washing devices;
- wherein the H2O adjustment means is configured to mix water from one of the at least two waste water treatment devices which is disposed downstream from another of the at least two waste water treatment devices in view of the gas flow, with the gas to be introduced into the COS treatment device.
A gas purification method for purifying gas including COS, H2O, CO2, and H2S, the method comprising:
- an H2O adjustment step of adjusting a concentration of H2O in the gas;
- a COS treatment step of degrading COS in the gas of which the concentration of H2O has been adjusted by hydrolyzing by using a COS conversion catalyst;
- a coal drying step of drying coal by removing moisture from the coal;
- a gasification step of gasifying the dried coal;
- at least two water washing steps of water washing the gas obtained by degrading COS;
- and
- at least two waste water treatment steps of treating waste water, each waste water treatment step treating waste water discharged from one of the at least two water washing steps;
- wherein the H2O adjustment step is a step of mixing the water treated in one of the at least two waste water treatment steps which is after another of the at least two waste water treatment steps, with the gas before the COS treatment step.
Dependencies are inferred from the claim text.