| 摘要 |
Adsorption towers are filled with adsorbents that adsorb methane gas in coal mine gas and perform a PSA cycle. For each of adsorption towers, a plurality of different pressure states of the internal pressure of the adsorption tower are set as an intermediate pressure state. As a pressure equalization step, an initial pressure equalization step of transferring the gas in one of the adsorption towers that is in a high pressure state to another one of the adsorption towers that is in an intermediate pressure state, and a final pressure equalization step of transferring the gas in one of the adsorption towers that is in the high pressure-side intermediate pressure state to another one of the adsorption towers that is in the low pressure state are performed. |
