Wet flue gas desulfurization apparatus and operation method for wet flue gas desulfurization apparatus

A wet flue gas desulfurization apparatus comprising:

• an absorber that includes an absorbent storage tank for storing absorbent and a flue gas passage through which flue gas discharged from a combustor passes, the absorber being configured to bring the flue gas into contact with the absorbent to cause the absorbent to absorb a sulfur oxide included in the flue gas;
• a gas introduction unit that is arranged on an upper side wall of the absorber, and that is configured to introduce the flue gas into the absorber;
• an absorbent jetting unit that is arranged in the flue gas passage, and that is configured to jet the absorbent into a space of the absorber;
• an absorbent circulation line that is configured to supply the absorbent to the absorbent jetting unit from the absorbent storage tank;
• a plurality of water flow oxidation devices that are configured to jet part of the absorbent branched and introduced from the absorbent circulation line into an inside of the absorbent storage tank together with air;
• and
• a control device that is configured to execute for adjusting any one or both of a jetting amount of the absorbent jetted from the water flow oxidation devices and a supply amount of the air supplied to the water flow oxidation devices based on any one or both of a concentration of a sulfur compound included in the flue gas and a concentration of a sulfur compound in the absorbent within the absorbent storage tank,
• wherein the control device is configured to execute any one or both of control for varying the number of operating water flow oxidation devices and control for varying a circulation amount of the absorbent circulated into the water flow oxidation devices, and
• the control device is configured to execute control for varying an amount of the air supplied to the water flow oxidation devices with a valve, and
• wherein the control device is configured to execute control for reducing the number of the operating water flow oxidation devices when any one or both of a concentration of a sulfur compound included in the flue gas and a concentration of a sulfur compound in the absorbent within the absorbent storage tank are lower than a predetermined threshold set in advance.