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Process and device for producing calcium carbide by using powder raw materials through two-stage method

A two-stage method and raw material technology, applied in the chemical industry, sustainable manufacturing/processing, carbide, etc., can solve the problems of long residence time, slow reaction rate, small production capacity, etc., and achieve fast reaction rate and high utilization rate , the effect of large production capacity

Inactive Publication Date: 2010-09-01
山西亿众公用事业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction surface of bulk raw materials is small, the reaction rate is slow, the residence time in the furnace is long, the production capacity is small, and the energy consumption per unit product is high

Method used

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  • Process and device for producing calcium carbide by using powder raw materials through two-stage method
  • Process and device for producing calcium carbide by using powder raw materials through two-stage method
  • Process and device for producing calcium carbide by using powder raw materials through two-stage method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The device for producing calcium carbide by the two-stage method is composed of an upper shaft furnace, a lower electric arc furnace and a cyclone separator 9. The shaft furnace is a cylindrical structure with an external insulation layer. The lower part of the shaft furnace has a gas distribution plate 6, and the gas distribution plate 6 is There are raw material inlet 7, raw material return port 12, oxygen nozzle 13 under the gas distribution plate 6, furnace gas outlet 8 on the top of the shaft furnace connected to the cyclone dust collector 9, the raw material return pipe 11 on the cyclone dust collector and the raw material return port 12 connections, the bottom of the shaft furnace communicates with the feeding pipe 5, and the lower section of the electric arc furnace consists of a furnace shell 16, a furnace wall 17, a furnace body manhole 2, a furnace cover 3, an electrode 14, an electrode sealing ring 15, a hearth 1, and a calcium carbide liquid row Outlet 18 an...

Embodiment 2

[0032] The vertical furnace aspect ratio of the calcium carbide plant produced by the two-stage method is 5.5, and there are 6 oxygen nozzles. The above-mentioned anthracite and quicklime are crushed and screened until the particle size is less than 8mm, and dried until the moisture content is less than 4wt%. After blending according to the weight ratio—anthracite: quicklime=1.72:1, they are continuously fed at a flow rate of 210kg / h In the vertical furnace, the discharge temperature of the upper shaft furnace is controlled at 1300-1500°C, the temperature of the calcium carbide liquid in the lower section of the electric arc furnace is controlled at about 1900-2100°C, and 64Nm of pure oxygen is injected 3 / h. Discharge calcium carbide liquid every two hours, each discharge is about 170kg, cool it to room temperature, CaC 2 The content is 80.6%, and the gas production is 300L / kg. All the other are with embodiment 1.

Embodiment 3

[0034]The vertical furnace aspect ratio of the calcium carbide plant produced by the two-stage method is 4, and there are 3 oxygen nozzles. The above-mentioned coke and limestone are first crushed and screened until the particle size is less than 8mm, dried until the water content is less than 4wt%, and then mixed according to the weight ratio—coke:limestone=1.47:1, and then fed continuously according to the flow rate of 330kg / h In the vertical furnace, the discharge temperature of the upper section of the shaft furnace is controlled at 1300-1500°C, the temperature of the calcium carbide liquid in the lower section of the electric arc furnace is controlled at 1900-2100°C, and pure oxygen is injected at 110.8Nm 3 / h. Discharge calcium carbide liquid every two hours, each discharge is about 170kg, cool it to room temperature, CaC 2 The content is 80.6%, and the gas production is 300L / kg. All the other are with embodiment 1.

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Abstract

The invention relates to a process for producing calcium carbide by using powder raw materials through the two-stage method, which comprises the following steps: leading power carbon-containing material, powder calcium-containing material and oxygen to burn, increasing the temperature of furnace materials in a vertical furnace to above 1300 DEG C, leading the hot furnace materials discharged from the bottom of the vertical furnace to enter into an electric arc furnace, increasing the temperature of the hot furnace materials to 1700-2200 DEG C under the thermal effect of electric arc of an electrode, and carrying out reaction for generating the calcium carbide. Gas containing solids in the vertical furnace is discharged by a furnace gas outlet pipe at the top of the vertical furnace and separated by a cyclone dust collector from, secondary dust collection, residual heat recovery and cloth bag dust collection are carried out on the separated gas to reduce the dust content to below 1-5mg / Nm3, the temperature is reduced to 30-45 DEG C, and then the gas can be recycled as fuel gas or chemical raw material gas. The process has the advantages of powder raw materials, low energy consumption, low cost, continuous production and high grade of the calcium carbide.

Description

technical field [0001] The invention relates to a production process and a device for calcium carbide, in particular to a process and a device for producing calcium carbide as a powdery raw material by a two-stage method. Background technique [0002] The main component of calcium carbide is CaC 2 , is an important raw material in the organic synthesis industry and plays an important role in the chemical industry. The methods for producing calcium carbide mainly include electrothermal method and oxythermal method. At present, the electrothermal method is used in the industrial production of calcium carbide. This method has a history of more than 110 years. A large amount of electric energy is consumed, generally 3500-3800kWh / t of calcium carbide, and the comprehensive energy consumption is very high, which is not conducive to energy saving and sustainable development of society. [0003] The production of calcium carbide by oxythermal method is still in the experimental st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B32/942
CPCY02P20/10Y02P20/129
Inventor 赵多祥刘守军张智聪杜文广程加林
Owner 山西亿众公用事业有限公司
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