| 摘要 |
<p>Provided are a method and a system for producing calcium carbide. The method comprises mixing powdery carbon-containing raw material with powdery calcium-containing raw material; directly heating the mixture by combusting a part of carbon-containing raw material in an oxygen-containing atmosphere to produce calcium carbide. The carbon-containing raw material can be coal, semi-coke or coke, the calcium-containing raw material can be calcium carbonate, calcium oxide, calcium hydroxide or carbide slag. The system for producing calcium carbide of the present invention comprises a raw material preheating unit and a reaction unit. The preheater of the raw material preheating unit can be a fluidized bed or an entrained flow bed, and the reactor of the reaction unit is entrained flow bed. The present invention can overcome the disadvantages of the prior art for the calcium carbide production such as high energy consumption and high pollution, and has advantages of a wide range of available raw materials, high energy utilization ratio, continuous operation, and large producing ability. By using the combustion of the by-product CO produced during the production of calcium carbide or auxiliary fuel in the air to preheat the raw materials to 500-1500 °C, the carbon consumption and the oxygen consumption for the calcium carbide production can be reduced, and thus process energy consumption is further reduced.</p> |
