Sealed semi-coke discharging system of coke quenching equipment of compound furnace, and control method

The invention discloses a sealed semi-coke discharging system of coke quenching equipment of a compound furnace, and a control method. The system comprises a discharging device and a control device. The discharging device comprises an upper-layer quantifying bin, a lower-layer discharging bin, a first hydraulic drive gate valve, a first hydraulic drive flap valve, a second hydraulic drive gate valve and a second hydraulic drive flap valve. The control method comprises the steps: 1, starting circulation of semi-coke from the upper-layer quantifying bin to the lower-layer discharging bin; 2, stopping the circulation of the semi-coke from the upper-layer quantifying bin to the lower-layer discharging bin; 3, discharging the semi-coke from the lower-layer discharging bin; and 4, stopping discharging of the semi-coke from the lower-layer discharging bin. According to the invention, the first hydraulic drive gate valve, the first hydraulic drive flap valve, the second hydraulic drive gate valve and the second hydra