Hydrogen-oxygen mixed injection and heat energy comprehensive utilization calcium carbide furnace system

Abstract

The invention belongs to the field of coal chemical industry, and particularly relates to a calcium carbide-related production process. A hydrogen-oxygen mixed injection and heat energy comprehensive utilization calcium carbide furnace system provided by the invention comprises a solid mixer, a pulverized coal pyrolysis furnace, a cyclone dust collector, an oil-gas condensation device, a pyrolytic gas purification device, a gas mixer, an electric arc furnace, an oxygen tank and a hydrogen tank. Therefore, the electric arc furnace of the calcium carbide furnace system is adopted to produce calcium carbide and heat generated by hydrogen-oxygen combustion is used to replace part of electric energy, thus solving the problem of high power consumption for calcium carbide production; pulverized coal pyrolyzing in the pulverized coal pyrolyzing furnace is carried out by absorbing part of waste heat of generated flue gas and taking the heat as a heat source, so that the purpose of upgrading utilization of low-rank coal is achieved, and the production cost is reduced; by the adoption of the pulverized coal pyrolyzing furnace for pyrolysis, the content of hydrogen in calcium carbide exhaust gas can be increased; the pulverized coal pyrolyzing furnace can be used for various chemical raw materials; and the hydrogen is used as a byproduct produced by the pulverized coal pyrolyzing furnace for extraction production and can be recycled.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a production process of calcium carbide. Background technique [0002] Calcium carbide, commonly known as calcium carbide, is produced by the reaction of coke and calcium oxide. It is an important coal chemical product and basic chemical raw material, mainly used in the production of acetylene and acetylene-based chemical products. The produced acetylene gas can be used to prepare a variety of chemical products, including vinyl chloride series, vinyl acetate series and acrylic acid series products. Therefore, calcium carbide plays a very important role in the development of my country's national economy, and the output of calcium carbide has been increasing in the past ten years. [0003] Although the calcium carbide industry has been developed for many years, in the conventional calcium carbide production process, arc heating is mainly used. In the prior art, ...

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Problems solved by technology

However, the above-mentioned technology of producing calcium carbide by conventional electric arc heating has the following technical problems: the process of producing calcium carbide by electric arc heating consumes a large amount of electric energy, and cannot directly utilize the heat energy of coal powder combustion; and, the required reaction temperature is high, and energy consumption is high. Large, high requirements for refractory materials; the existing calcium carbide production technology by arc heating cannot use powder, resulting in waste of powder, which indirectly increases production costs; the high temperature flue gas produced in the existing calcium carbide production technology The amount is relatively small, and the heat contained in the high-temperature flue gas is difficult to recover

However, the main defect of the oxythermal method in the prior art is that it does not solve the technical problems of the block material reaction. Due to the small specific surface area of ​​the block material, the oxythermal method still needs to complete the reaction at a relatively high temperature. As a result, the energy consumption of the system is high; moreover, the production raw materials of the oxythermal method in the prior art are still lump coke and limestone with relatively high prices, which does not effectively reduce the cost of raw materials; the high-temperature flue gas produced by the production system is only Using the high-temperature gas to preheat raw materials and generate electricity does not take advantage of the reducing properties of the high-temperature gas. Therefore, the utilization efficiency of the high-temperature gas after recovery needs to be further improved

According to the current research, it is quite difficult to directly realize the low-cost production of calcium carbide by the oxythermal method

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