ELECTROCHEMICAL METHOD FOR PREPARING PURE-OXYGEN GAS AND OXYGEN-POOR GAS BY USING OXYGEN-CONTAINING GAS MIXTURE

摘要

The present invention relates to an electrochemical method for preparing a pure-oxygen gas and an oxygen-poor gas by using an oxygen-containing gas mixture. The method comprises at least two electrolyzed-water units and power supply units corresponding to the electrolyzed-water units. Each of the power supply units comprises at least one hydrogen energy recycling power supply unit and an externally-connected power supply unit. Each of the hydrogen energy recycling power supply unit uses a hydrogen fuel battery. Each of the externally-connected power supply unit uses at least one of the following items: a solar cell, a direct methanol fuel cell, and a power supply of an external alternating-current grid. Each of the power supply units is in circuit connection with the corresponding electrolyzed-water unit separately. Hydrogen generated by all the electrolyzed-water units is output to the hydrogen fuel batteries as a fuel. Oxygen generated by the electrolyzed-water units is the required pure oxygen. A negative electrode and a positive electrode of each of the hydrogen fuel battery of each of the hydrogen energy recycling power supply units input hydrogen and an oxygen-containing gas mixture. The input hydrogen is connected to a negative positive hydrogen chamber of the electrolyzed-water unit through a pipe. Gas-liquid separation is performed on exhaust of a positive electrode side is output as oxygen-poor gas. In the present invention, high-purity oxygen can be stably and continuously prepared in low cost on an indoor site and an outdoor site.