Method for producing calcium carbide by biomass fuel

A technology of biomass fuel and calcium carbide, applied in the direction of carbide, calcium carbide, etc., can solve the problems of high investment, high pollution, high energy consumption, etc., and achieve the effect of high utilization rate, low pollution and large production capacity

Inactive Publication Date: 2013-12-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The aim of the present invention is to solve the problem of "high input, high energy consumption, and high pollution" in the production of calcium carbide. Through a lot of research and creative work, the inventor has developed a simple process, low energy consumption, wide source of raw materials, and low cost. Calcium carbide production method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Send 230 grams of wheat straw from the Huaibei Plain with a length of 6mm into a preheater and heat it to 350-500°C for coking, and separate the solid carbon and volatile matter after coking. The volatile matter and the final by-product CO and oxygen-enriched gas are passed into the combustion preheater equipped with 120 grams of CaO powder with a particle size of 0.65 mm, the solid carbon is mixed with the preheated CaO, and 60 L of oxygen is injected into the reactor. Make the raw material reach 1750-2100°C, react for 10 minutes and cool to normal temperature. If the conversion rate is 100%, the expected solid product mass is 137 grams. The reaction to form calcium carbide is reversible. The conversion rate of CaO is generally 65-70%, and the obtained solid mass should actually be 131-132 grams.

Embodiment 2

[0026] Heat 210 grams of corn cobs with a length of 5mm to 300-500°C for coking in a reactor, and separate the coked solid carbon and volatile matter. Volatile matter and the final by-product CO and oxygen-enriched gas are fed into 130 grams of CaO powder with a particle size of 0.65mm to burn and preheated, then solid carbon is mixed with the preheated CaO, and 65L of oxygen is injected into the reactor. Make the raw material reach 1750-2100°C, react for 10 minutes and cool to normal temperature. If the conversion rate is 100%, the expected solid product mass is 148.6 grams. Similarly, the conversion rate of CaO is generally 65-70%, and the obtained solid mass should actually be 142-143 grams.

[0027] Compared with the traditional calcium carbide production method, the present invention chooses a new environment-friendly energy source—biomass fuel. The difference in carbon content of biomass fuel relative to coke is only 10%. Moreover, biomass fuel raw materials have wide...

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Abstract

The invention relates to a method for producing calcium carbide by a biomass fuel. The method comprises the following steps: by taking a strip-like biomass fuel raw material and a powdery calcium-containing raw material, burning volatile components generated by coking the biomass fuel raw material and oxygen-containing gases to supply heat to the calcium-containing raw material; then, preparing calcium carbide by solid carbon generated by coking and the calcium-containing raw material at 1700-2100 DEG C. By adopting the strip-like biomass fuel to replace a powdery carbon-containing raw material, the biomass fuel is relatively low in density and low in coking temperature and is fully coked at 300-500 DEG C, so that energy consumed for preparing the biomass fuel is saved. By adopting the powdery raw material, the contact area of reactants is increased, so that the reaction is fully carried out, thereby improving the reaction capacity and the raw material utilization ratio. The process is further coupled with the processes of coking the carbon-containing raw material and burning the calcium-containing raw material, and the volatile components generated by coking the biomass fuel, a byproduct CO produced by calcium carbide and an auxiliary fuel are burnt to preheat and calcine the calcium-containing raw material to 500-1500 DEG C, thereby not only realizing full utilization of the raw material, but also reducing oxygen consumption and energy consumption of the process in production of calcium carbide.

Description

technical field [0001] The invention belongs to the field of calcium carbide production, and in particular relates to a method for producing calcium carbide from biomass fuel. Background technique [0002] Calcium carbide (CaC 2 ), commonly known as calcium carbide, was known as the mother of organic synthesis before the middle of the last century. As a major intermediate product of coal cleaning, calcium carbide is widely used in the synthesis of organic chemical products such as benzene, rubber, polyvinyl chloride, and polyacetylene. In industry, electric furnace smelting method (electrothermal method) and oxythermal method are generally used to produce calcium carbide. [0003] Modern industrial production generally uses electrothermal method to produce calcium carbide. The electric furnace smelting method is to smelt coke and calcium oxide (molecular formula CaO) in an electric furnace at about 2200 ° C to generate calcium carbide (molecular formula CaC 2 ). Quickli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B32/942
Inventor 杨卫民张震焦志伟阎华丁玉梅郁文霞陈实张栩
Owner BEIJING UNIV OF CHEM TECH
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