Roll-type device for electrochemical recovery of ammonia, and method for electrochemical recovery of ammonia

A roll-type device for an electrochemical recovery of ammonia, comprising:

• a central tube and a tubular shell sleeved outside the central tube, wherein two axial ends of the tubular shell are provided with two end caps, respectively, the two end caps are in a sealed connection with two ends of the central tube, respectively, and the two end caps each are provided with an avoidance hole communicating with the central tube;
• two partition plates separating an inner hole of the central tube are provided inside the central tube, an axis of the central tube is set as a vertical direction, an upper partition plate of the two partition plates and an inner wall of the central tube located above the upper partition plate enclose a first electrode liquid outlet cavity with an upper opening, and a lower partition plate of the two partition plates and an inner wall of the central tube located below the lower partition plate enclose a first electrode liquid inlet cavity with a lower opening;
• the first electrode liquid outlet cavity and the first electrode liquid inlet cavity are separated by the two partition plates;
• a hydrophobic gas membrane and an anion-exchange membrane (AEM) are sequentially wound around the central tube, the hydrophobic gas membrane and the AEM are located inside the tubular shell, and a winding-starting edge of the hydrophobic gas membrane and a winding-starting edge of the AEM are in a sealed connection with an outer wall of the central tube;
• a winding direction of the hydrophobic gas membrane and the AEM around the central tube is set as a clockwise direction;
• the winding-starting edge of the AEM is located in a counterclockwise direction of the winding-starting edge of the hydrophobic gas membrane, a first porous flexible electrode and a first guide liner are sequentially wound at an inner side of the hydrophobic gas membrane, and a second porous flexible electrode and a second guide liner are sequentially wound at an inner side of the AEM;
• a winding-terminating edge of the hydrophobic gas membrane and a winding-terminating edge of the AEM are in a sealed connection with an inner wall of the tubular shell;
• the winding-terminating edge of the AEM is located in a counterclockwise direction of the winding-terminating edge of the hydrophobic gas membrane;
• edges of upper and lower ends of each of the hydrophobic gas membrane and the AEM are in a sealed connection with the two end caps of the two axial ends of the tubular shell, such that an inner side wall of the hydrophobic gas membrane, an outer wall of the central tube extending from the winding-starting edge of the hydrophobic gas membrane in the clockwise direction, an outer side wall of the AEM, and the inner wall of the tubular shell enclose a closed first electrode liquid flow chamber, and an inner side wall of the AEM, an outer wall of the central tube extending from the winding-starting edge of the AEM in the clockwise direction, an outer side wall of the hydrophobic gas membrane, and the inner wall of the tubular shell enclose a closed second electrode liquid flow chamber;
• a first partition is provided inside the closed first electrode liquid flow chamber, and the first partition separates the closed first electrode liquid flow chamber into a first flow channel;
• a second partition is provided inside the closed second electrode liquid flow chamber, and the second partition separates the closed second electrode liquid flow chamber into a second flow channel;
• a top of a side wall of the central tube is provided with an outlet hole allowing the first electrode liquid outlet cavity to communicate with the first flow channel, and a bottom of the side wall of the central tube is provided with an inlet hole allowing the first electrode liquid inlet cavity to communicate with the first flow channel;
• a first electrode liquid enters the closed first electrode liquid flow chamber through the inlet hole at the bottom of the central tube, flows from a bottom to a top, exits the closed first electrode liquid flow chamber through the outlet hole at the top of the central tube, and flows out through the first electrode liquid outlet cavity, and
• an upper part of a side wall of the tubular shell is provided with a second electrode liquid inlet communicating with the second flow channel, and a lower part of the side wall of the tubular shell is provided with a second electrode liquid outlet communicating with the second flow channel;
• and a second electrode liquid flows in through the second electrode liquid inlet, flows from the top to the bottom, and flows out through the second electrode liquid outlet.