Desulfurization and denitration system based on seawater electrolysis and process thereof

The invention discloses a desulfurization and denitration system based on seawater electrolysis and a process thereof. A flue gas outlet is formed in the top of a tower body, a drain pipe is arrangedat the bottom of the tower body, and the interior of the tower body is horizontally divided into a gas collection section, a gas-gas heat exchange section, a denitration section and a desulfurizationsection from top to bottom; a flue gas pipeline is arranged at a slightly upper position in the tower body, the flue gas pipeline is arranged between the gas collection section and the gas-gas heat exchange section, and the open end of the flue gas pipeline extends out of the tower body; a plurality of needle-shaped plate-type devices are horizontally arranged in the middle of the interior of thetower body at intervals, the needle-shaped plate-type devices are vertically and longitudinally arranged, and the upper ends of the needle-shaped plate-type devices are respectively communicated withthe flue gas pipeline in a s