Lime production system and method

The invention provides a lime production system and method, which belong to the technical field of lime production. The system comprises a shaft kiln and a heating device, wherein the shaft kiln is sequentially provided with a feeding port, a preheating section, a reaction section, a cooling section and a discharging port from top to bottom; the top of the preheating section is connected with a discharge pipeline, is connected to the bottom of the cooling section through a cooling pipeline, and is also connected to the bottom of the reaction section through a heating pipeline; and a heating device is arranged on the heating pipeline. Limestone raw materials enter the shaft kiln from the feeding port and then sequentially pass through the preheating section, the reaction section and the cooling section to become lime products. According to the system, carbon dioxide released by limestone decomposition is prevented from being mixed with fuel combustion flue gas, so that emission carriergas containing high-conce