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Method and system for producing calcium carbide by utilizing limestone

A limestone and calcium carbide technology, applied in the petroleum industry, special dry distillation, carbide, etc., can solve the problems of high energy consumption, low efficiency, high pollution, etc., reduce the cost of equipment and calcination energy consumption, and solve the problem of coking of radiant tubes Effect

Inactive Publication Date: 2017-02-22
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above problems, the present invention aims to provide a method and system for producing calcium carbide from limestone. The purpose of the system and method is to solve the problem of high energy consumption, high pollution, low benefit, and easy occurrence of radiant tubes in the pyrolysis process of the traditional calcium carbide production process. For the problem of coking, both powder limestone and block limestone can be used as raw materials for calcium carbide production

Method used

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  • Method and system for producing calcium carbide by utilizing limestone
  • Method and system for producing calcium carbide by utilizing limestone

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Experimental program
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Effect test

Embodiment 1

[0060] Through the crushing device, the medium and low-rank coal, powdered limestone and binder are crushed to a particle size of <50 mesh; according to the proportion (binder: powdered limestone: coal powder = 0.06:0.70:1) They are fed into the powerful mixer through the screw feeder and then put into the ball pressing machine for molding; the obtained balls are sent into the lower material plate of the double-layer non-heat carrier regenerative rotary bed, and the lump quicklime is sent into the rotary bed at the same time. The upper material plate of the bed (mass ratio of massive quicklime to initial pulverized coal is 1.1:1); the heating temperatures of the upper and lower radiant tubes are 950°C and 800°C, respectively. The massive limestone and pellets are calcined and pyrolyzed into high-temperature massive quicklime and high-temperature active pellets respectively, and high value-added oil and gas products are obtained. The oil and gas products produced by pyrolysis a...

Embodiment 2

[0062] Through the crushing device, the medium and low-rank coal, powdered limestone and binder are crushed to a particle size of <50 mesh; according to the proportion (binder: powdered limestone: coal powder = 0.23:1.1:1) They are fed into the powerful mixer through the screw feeder and then put into the ball pressing machine for molding; the obtained balls are sent into the lower material plate of the double-layer non-heat carrier regenerative rotary bed, and the lump quicklime is sent into the rotating bed at the same time. The upper material plate of the bed (mass ratio of massive quicklime to initial pulverized coal is 0.7:1); the heating temperatures of the upper and lower radiant tubes are 900°C and 750°C, respectively. The massive limestone and pellets are calcined and pyrolyzed into high-temperature massive quicklime and high-temperature active pellets respectively, and high value-added oil and gas products are obtained. The oil and gas products produced by pyrolysis ...

Embodiment 3

[0064] Through the crushing device, the medium and low-rank coal, powdered limestone and binder are crushed to a particle size of <50 mesh; according to the proportion (binder: powdered limestone: coal powder = 0.21:0.9:1) They are fed into the powerful mixer through the screw feeder and then put into the ball pressing machine for molding; the obtained balls are sent into the lower material plate of the double-layer non-heat carrier regenerative rotary bed, and the lump quicklime is sent into the rotary bed at the same time. The upper material plate of the bed (mass ratio of block quicklime to initial pulverized coal is 0.9:1); the heating temperatures of the upper layer radiant tube and the lower layer radiant tube are 1000°C and 900°C respectively. The massive limestone and pellets are calcined and pyrolyzed into high-temperature massive quicklime and high-temperature active pellets respectively, and high value-added oil and gas products are obtained. The oil and gas product...

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Abstract

The invention relates to a method and system for producing calcium carbide by utilizing limestone. The method comprises the following steps: molding mixture of finely powdered medium and low-rank coal, limestone and adhesive into pellets; layering and pyrolyzing the pellets and massive limestone in a dual-layer revolving bed, putting the pellets below the massive limestone, calcining the massive limestone while catalytically cracking raw gas generated by pyrolyzing the pellets in the lower layer, and calcining and pyrolyzing to obtain high-temperature massive quicklime, oil-gas products and high-temperature active pellets; and insulating the high-temperature massive quicklime and high-temperature active pellets, and feeding into a calcium carbide melting furnace to generate calcium carbide and calcium carbide furnace gas. According to the method and system for producing calcium carbide by utilizing limestone, powdered limestone can be sufficiently utilized, and pyrolysis gas generated by pyrolyzing pellets is catalytically cracked and filtered while the massive limestone is used as a raw material, so that the caking problem of radiant tubes can be solved.

Description

technical field [0001] The invention mainly relates to the production field of calcium carbide, in particular to a method and system for producing calcium carbide by utilizing limestone. Background technique [0002] As an important chemical raw material, calcium carbide is mainly used in the production of acetylene and acetylene-based chemical products. It was once known as the "mother of the organic synthesis industry". From the perspective of energy distribution in my country, "rich coal, poor oil, and little gas" is a typical feature of my country's energy structure. Coal is the main energy source in my country, accounting for about 70% of primary energy. Therefore, calcium carbide production is of great significance to the development of industrial economy. . [0003] At present, the raw materials for calcium carbide smelting are mainly high-quality lump semi-coke and lump quicklime. Not only the cost of raw materials is high, but also the contact area between lump sem...

Claims

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Application Information

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IPC IPC(8): C01B32/942C10B53/08C10B57/18
CPCC10B53/08C10B57/18
Inventor 刘维娜丁力郭启海董宾张顺利吴道洪
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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