Method and device for co-producing calcium carbide by coke and lime

Abstract

The invention relates to a method and a device for co-producing calcium carbide by coke and lime, wherein the device comprises an electric-arc furnace, a coking furnace and a lime kiln. The upper part of the electric-arc furnace is provided with an electrode, a coke inlet, a lime inlet and a gas outlet. The coking furnace is connected with the coke inlet by conveying equipment, an outlet of the lime kiln is connected with the lime inlet, and the gas outlet is connected with a burning system of the lime kiln. The lime and the coke are heated up to 2000-2200 DEG C in the electric-arc furnace, and are subjected to carbonization reaction to generate the calcium carbide and calcium carbide furnace gas. The un-cooled high-temperature lime in the lime kiln and un-coke quenched high-temperature coke in the coking furnace directly enter into the electric-arc furnace to be reacted to generate the calcium carbide, and the calcium carbide furnace gas is taken as burning fuel in the lime kiln. According to the invention, the coking furnace, the lime kiln and the electric-arc furnace are combined with one another, the high-temperature coke in the coking furnace and the high-temperature lime in the lime kiln are taken as raw materials to produce the calcium carbide, the calcium carbide furnace gas is taken as the fuel of the lime kiln, the energy sources can be sufficiently used, the energy consumption and the power consumption can be reduced, and the production cost of the calcium carbide can be reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a production method and device for calcium carbide, in particular to a production method and device for co-producing calcium carbide with coke and lime. Background technique [0002] Calcium carbide, commonly known as calcium carbide, reacts with water to form acetylene. Acetylene is an important chemical raw material, mainly used in the production of polyvinyl chloride-based, vinyl acetate-based and acrylic-based products. More than 70% of PVC products in my country are derived from acetylene produced by calcium carbide. The price increase of petroleum products has stimulated the development of calcium carbide industry. [0003] In industry, the fixed bed-arc method is generally used in the production of calcium carbide. The high temperature generated by the arc is used to heat the lime and coke in the calcium carbide furnace to 2000-2200 °C, and stay for a certain pe...

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Problems solved by technology

Cooling lime from a calcination temperature of 1200°C to normal temperature requires cooling wind power consumption; cooling coke from a high temperature of 950°C to normal temperature through coke quenching and other processes requires power consumption and a large amount of cooling water, which not only increases production costs, but also causes serious environmental pollution; When producing calcium carbide, it is necessary to heat the raw material calcium carbide and coke to 2000°C for reaction

The independent production systems not only increase the transportation cost, but also the by-products and residual heat cannot be utilized mutually, resulting in a great waste of energy.

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