Device and method for separating gases to be separated

Abstract

A device and method for separating gases to be separated are provided with which the energy consumption for separating a certain gas, e.g., CO2, from gases to be separated, e.g., a combustion waste gas or process gas, can be reduced to attain a reduction in device operation cost. The device for separating gases to be separated is equipped with a gas hydrate formation section in which a gas contained in the gases to be separated, which are a mixture of a plurality of gas components, is hydrated to form a gas hydrate slurry, a dehydration section in which the gas hydrate slurry is dehydrated, and a gas hydrate decomposition section in which the gas hydrate obtained by the dehydration is decomposed to gasify the hydrate again, and is characterized in that the device has been configured so that the water removed from the gas hydrate slurry in the dehydration section is mixed with the water resulting from decomposition of the gas hydrate in the gas hydrate decomposition section and the resultant circulating water is introduced into the gas hydrate formation section.

Description

technical field [0001] The present invention relates to a separation device and method for separating certain gases contained in gases to be separated such as combustion waste gas and production gas. Background technique [0002] As a certain gas contained in the combustion waste gas and production gas of coal-fired thermal power generation and integrated gasification combined cycle power generation systems (IGCC), steel plants, cement plants, etc., such as carbon dioxide (CO 2 ) separation technology, the implementation of chemical absorption method, PSA method (physical adsorption method), membrane separation method, physical absorption method, oxygen combustion method, etc. [0003] The reagents used in the chemical absorption method and the physical absorption method are expensive, and the above-mentioned chemicals are highly toxic, and the leakage of the chemicals will cause a problem of environmental pollution. In the PSA method (physical adsorption method) and membra...

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Problems solved by technology

[0005] However, when generating CO 2 In the case of gas hydrates such as hydrates, processes such as pressurization and cooling are required, and in the case of decomposing (regasifying) gas hydrates in order to utilize the separated gas, due to the relatively low temperature Energy is required to raise the temperature, so the running cost tends to be relatively high

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