Apparatus and method capable of monitoring and adjusting in-furnace combustion conditions in real time

An apparatus configured for real-time monitoring and adjustment of combustion conditions in a furnace, comprising:

• a) a furnace having a heating chamber, a burner, a loading gate, an exhaust gas stream port and an exhaust gas stream duct, wherein the burner is configured for introducing a fuel and/or an oxygen-containing gas into the heating chamber so as to form a flame, the loading gate is used for adding a raw material, and a gas produced by combustion in the heating chamber enters the exhaust gas stream duct via the exhaust gas stream port;
• b) a first sensor and a second sensor of the same type arranged at different positions in the exhaust gas stream duct, and the first sensor is arranged close to the exhaust gas stream port, the second sensor is arranged 5-10 meters downstream of the first sensor, and the difference between the two sensor signals can be used to estimate an atmosphere state in the heating chamber and/or whether post-combustion occurs in the exhaust gas stream duct;
• c) a control device, for receiving signals of the two sensors, and adjusting the amount of fuel and/or oxygen-containing gas entering the burner according to the difference between the signals
• wherein both sensors are selected from flame sensors, pressure sensors, oxygen concentration sensors, carbon monoxide concentration sensors or carbon dioxide concentration sensors,
• wherein the exhaust gas stream duct is built of a refractory material by masonry, and air can enter the exhaust gas stream duct through gaps in the refractory material.