Method for preparing calcium carbide and synthetic gas via flameless oxidation heating method, and calcium carbide reactor

Abstract

The invention discloses a method for preparing calcium carbide and a synthetic gas via a flameless oxidation heating method, and a calcium carbide reactor, and solves problems of influencing time and effect of calcium carbide reaction caused by uneven heat distribution of the calcium carbide and the synthetic gas prepared by a conventional method and non-uniform particle size of materials entering a reaction chamber. In the method, flameless combustion in the reaction chamber is realized by controlling oxygen content in a mixed gas passing into the reaction chamber; and problems of non-uniform particle size of materials in the reaction chamber is solved by designing feeding particle size at two feeding ports. The reactor enables heat distribution in the chamber to be more uniform through the improvement of oxygen burners of the reaction chamber and a vaporizing chamber. The method is simple in process, is safe and reliable, has more uniform heat distribution, high calcium carbide reaction efficiency and high calcium carbide purity, low loss to furnace walls, the content of the generated synthetic gas is over 7 times that a conventional electrothermal method, and at the same time, consumption rate of raw materials and fuels is low.

Description

technical field [0001] The invention relates to a method for preparing calcium carbide and synthesis gas and special equipment thereof, in particular to a method for preparing calcium carbide and synthesis gas by a flameless oxidation heating method and a calcium carbide reactor. Background technique [0002] There are two production methods of calcium carbide: oxythermal method and electrothermal method. Regarding the production of calcium carbide by oxythermal method, the application number jointly applied by China Wuhuan Engineering Co., Ltd. and Henan Coal Industry Chemical Industry Group Research Institute Co., Ltd. is 201010581701.0, and the publication number is 102153085A, the invention patent application titled "method for preparing calcium carbide and synthesis gas by oxythermal reaction and calcium carbide reactor" introduced a calcium carbide reactor and a method for preparing calcium carbide and synthesis gas by oxythermal reaction, in which calcium carbide The ...

AI Technical Summary

Problems solved by technology

However, if the particle size of the material is too small, it is easy to be blocked in the preheating chamber by the rising airflow, and it is difficult to enter the reaction chamber.

Although two feed inlets are designed in the closed reaction furnace to solve the problem that the material goes down to the reaction chamber smoothly, but because the first feed inlet and the second feed inlet enter the same particle size, this may cause the first inlet The material fed into the feed port cannot pass through the updraft and enter the reaction chamber because the particle size is too small; or the material passed into the first feed port and the second feed port has a large particle size, and the material passed into the first feed port overcomes the air flow. When it reaches the reaction chamber, it is partially consumed, and the particle size becomes smaller. However, the material passed through the second feed port walks along the wall and consumes less, and the particle size is still large. Finally, the particle size of the calcium carbide reaction material in the reaction chamber is uneven. , also affect the time and effect of calcium carbide reaction

[0006] 3. The angle of the second feed port is not good. In the above technical solution, the downward inclination angle of the second feed port on the side wall of the preheating chamber is 10-30°, and the tangential angle is 3-10°. In the actual research and development It is found that under this angle, the smooth descending effect of the material is still not ideal. If the particle size of the material is reduced, the descending effect will be even worse, so further improvement is hoped to ensure that more materials can smoothly descend, preheat and participate in the calcium carbide reaction. , without being carried out of the reactor by the updraft

[0007] 4. In order to meet the temperature requirements of calcium carbide reaction, both the gasification chamber and the reaction chamber are kept in a high temperature state through flaming combustion, and the maximum temperature resistance requirement of the furnace wall should be above 2000°C. Because a large amount of oxygen is fed into the furnace to burn to maintain high temperature, as Commonly used high-temperature refractory materials (general refractory bricks can only withstand high temperatures of about 1850°C) cannot meet the requirements of use, but refractory materials that can meet high-temperature resistance, such as carbon bricks, etc. Under the above high temperature conditions, the carbon in the carbon bricks will react with oxygen It leads to the loss of the furnace wall and cannot meet the requirements of high temperature resistance and long life

[0008] Due to the existence of the above technical problems, when the technical solution with the application number 201010581701.0 is in actual operation, the actual production of calcium carbide purity, gas production, and reaction speed are 20-30% different from the theoretical design values.

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