Raw material preheating system for calcium carbide production procedures and method for applying raw material preheating system

Abstract

The invention relates to a raw material preheating system for calcium carbide production procedures and a method for applying the raw material preheating system. The raw material preheating system comprises a pulverized coal pyrolysis subsystem, a limestone powder decomposition subsystem and an oxygen thermal calcium carbide reactor. The pulverized coal pyrolysis subsystem comprises a pulverized coal-thermal medium mixer and a semi-coke separator, the limestone powder decomposition subsystem comprises a limestone powder conveyor, a limestone powder-thermal medium mixer, a calcium oxide separator, a calcium oxide conveyor and a carbon-coated calcium oxide separator, the oxygen thermal calcium carbide reactor is connected with the pulverized coal-thermal medium mixer, the semi-coke separatoris connected with the oxygen thermal calcium carbide reactor and the calcium oxide conveyor, and the carbon-coated calcium oxide separator is connected with the oxygen thermal calcium carbide reactor. The raw material preheating system and the method have the advantages that the raw material preheating system is suitable for diversified reactors for oxygen thermal calcium carbide production, pulverized coal and calcium carbonate powder can be directly used as raw materials, accordingly, investment on coal pyrolysis and calcium carbonate decomposition furnaces can be reduced, and the gas-solidheat exchange time can be flexibly adjusted.

Description

technical field [0001] The present invention generally relates to the field of calcium carbide production in traditional coal chemical industry, and specifically relates to a raw material preheating system in the calcium carbide production process and an application method thereof. Background technique [0002] Calcium carbide production is based on the reaction of carbon-containing raw materials (coal, coke, semi-coke, etc.) and calcium-containing raw materials (calcium oxide, calcium hydroxide, calcium carbonate, etc.) 2 ). According to different heating methods, calcium carbide production methods are generally divided into two types: electrothermal method and oxygen thermal method. [0003] The electrothermal method has a history of hundreds of years. The traditional electrothermal calcium carbide production process is to use the heat energy generated by the arc to make the carbon raw material and lime react at a temperature of about 2000-2200 ℃ to produce calcium carbid...

AI Technical Summary

Problems solved by technology

The production of calcium carbide by electrothermal method has the disadvantages of "high energy consumption, high investment, high pollution, and low production capacity". The key reason is that the reaction between bulk raw materials is mainly controlled by the heat transfer process, and the effective utilization rate of electric energy is only 40%-60%. serious energy loss

Moreover, the production of calcium carbide by the electrothermal method is restricted by electrode layout, heat distribution between electrodes, and the layout of the conductive elements of the holder. The production scale of a single furnace will not be large, and there are limitations in the occupation of large calcium carbide devices and investment.

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