Method of preparing acid by using pre-converted and pre-absorbed high concentration flue gas

The invention discloses a method of preparing acid by using pre-converted and pre-absorbed high concentration flue gas. A high concentration pre-conversion device and a high concentration pre-absorption device are included. The high concentration pre-conversion device is connected to a pre-absorption system through a gas pipe. The invention provides the method of preparing acid by using pre-converted and pre-absorbed high concentration flue gas. By controlling a gas splitting valve, the flue gas condition of a primary conversion system is adjusted to be steady and the influence of large concentration and quantity of smelting flue gas on an acid preparation system is reduced. By cooling the flue gas at a pre-absorption inlet by using the flue gas at the outlet of the pre-absorption system,pre-converted heat is transferred to the primary conversion system partially while the pre-absorption gas inlet temperature is reduced, so that the surplus heat of the primary conversion system is improved, and steady product