Online dilute sulfuric acid concentration control device in chlorine drying process based on DCS control system

The invention relates to an online dilute sulfuric acid concentration control device in a chlorine drying process based on a DCS control system. The device comprises a concentrated sulfuric acid elevated tank, a packing drying tower, a bubble cap drying tower, a dilute sulfuric acid circulating pump and a dilute sulfuric acid cooler. An acid discharging control valve and an acid discharging flow meter are arranged on an acid discharging pipeline of the concentrated sulfuric acid elevated tank, the packing drying tower is provided with a liquid level sensor, and a sulfuric acid densimeter and an acid discharging adjusting valve are arranged on a dilute sulfuric acid discharging pipeline. The acid discharging adjusting valve is electrically connected with the liquid level sensor, the sulfuric acid densimeter is electrically connected with the overhead tank acid discharging control valve and the acid discharge flow meter, and the sulfuric acid densimeter, the acid discharging adjusting valve, the overhead tank a