By utilizing the waste heat from high-temperature or medium temperature flue gas emitted from a carbon canister calcination furnace and installing a waste heat boiler, medium temperature, medium pressure or low-temperature, low-pressure steam is produced to drive the turbine, thereby driving the generator to generate electricity. The electricity is then transmitted to the factory's main step-down substation and reused for factory production. After passing through the waste heat boiler, the flue gas enters the flue gas desulfurization system or is directly discharged into the chimney through the induced draft fan. Our company's waste heat boiler adopts a double drum horizontal natural circulation water tube boiler. The dusty flue gas is discharged outside the furnace through the slag condenser tube, superheater, convection tube bundle, and steel tube economizer. The main technical features are: 1. It does not affect the calcination process flow and does not affect the quality of calcined coke. 2. Utilize waste heat to produce high-quality electricity. Make comprehensive and efficient use of the heat generated during calcination. 3. The amount of waste heat generated can meet the power demand of the plant. 4. The waste heat recovery device is an efficient waste heat boiler, with an efficiency of over 80%. 5. Realize comprehensive utilization of thermal energy. This waste heat boiler utilizes the waste heat from industrial dusty flue gas to generate steam that can be used for power generation, production, and daily life. It does not directly use disposable fuel, therefore it has the characteristics of energy conservation and comprehensive energy utilization. 6. Dust removal inside the furnace is beneficial for environmental protection. The industrial dusty flue gas contains a large amount of particulate dust. The boiler uses the principle of inertial separation at the bottom of the water-cooled flue and the bottom of the economizer to separate the smoke and dust by turning the flue gas, thereby reducing the smoke and dust content.