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System and method for production of calcium carbide

A calcium carbide and quicklime technology, applied in sustainable manufacturing/processing, carbide, chemical industry, etc., can solve the problems of heavy pollution, waste of sensible heat of blue carbon, and high overall process energy consumption

Active Publication Date: 2016-06-15
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production process of semi-coke, the raw material of calcium carbide, is independent of the smelting process of calcium carbide, which leads to the waste of sensible heat of high-temperature (400°C-800°C) semi-coke. At the same time, energy consumption and waste water or waste gas are generated during coke quenching. The energy consumption of the overall process is high and the pollution is heavy; at the same time, because the calcium carbide furnace has strict requirements on the particle size of the raw material (5-30mm), the semi-coke used is high-quality and high-priced semi-coke, and the cost is relatively high

Method used

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  • System and method for production of calcium carbide
  • System and method for production of calcium carbide
  • System and method for production of calcium carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A long-flame coal is used as the carbon raw material, and its main properties are shown in Table 1.

[0075] Table 1 Main properties of long-flame coal

[0076]

[0077]

[0078] Quicklime is used as the calcium-based raw material, crushed to <74μm, and the CaO content is 92%.

[0079] The long-flame coal is pulverized and dried with a medium-speed mill to make its particle size <1mm and moisture content <2%.

[0080] The powdered long-flame coal is sent to the fast pyrolysis device for pyrolysis, and the pyrolysis temperature is 650°C. The yield of pyrolysis products is shown in Table 2.

[0081] Table 2 pyrolysis product yield (wt%)

[0082] product

Yield

solid product

64.86

tar

14.38

gas

13.17

Pyrolysis water

7.59

[0083] Powdered quicklime and pyrolysis solid product are mixed at a ratio of 1.67:1 and then hot-pressed to form a ball with a particle size of 32×25×18mm.

[0084] The temperature...

Embodiment 2

[0086] A lignite is used as the carbon raw material, and its main properties are shown in Table 3.

[0087] Table 3 Main properties of lignite

[0088] project

unit

value

Remark

whole water

wt%

59.40

Receive base

fixed carbon

wt%

43.79

air dry basis

Volatile matter

wt%

46.84

air dry basis

Ash

wt%

1.94

air dry basis

[0089] Quicklime is used as the calcium-based raw material, crushed to <74μm, and the CaO content is 92%.

[0090] The lignite is pulverized and dried with a medium-speed mill to make its particle size <1mm and moisture content <5%.

[0091] The powdery lignite was sent to the fast pyrolysis device for pyrolysis, and the pyrolysis temperature was 550°C. The yield of pyrolysis products is shown in Table 4.

[0092] Table 4 pyrolysis product yield (wt%)

[0093] product

Yield

solid product

53.29

tar

7.18

gas

21....

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Abstract

The invention provides a system and method for production of calcium carbide, wherein the system for production of calcium carbide includes a low-rank coal processing unit, a quick lime processing unit, a pyrolysis device, a hot press molding unit, a high temperature conveying device and an electric arc furnace; the pyrolysis device is provided with a raw material inlet, an oil gas outlet and a solid product outlet, and the raw material inlet is connected with the low-rank coal processing unit; the hot pressing molding unit is connected with the pyrolysis device and the quick lime processing unit; the high temperature conveying device is connected with the hot press molding unit; the electric arc furnace is provided with a molded material inlet, a furnace gas outlet and a calcium carbide outlet, and the molded material inlet is connected with the high temperature conveying device. Therefore, pyrolysis sensible heat can be fully utilized, the power consumption of the electric arc furnace is reduced, the energy consumption is reduced, and the energy utilization rate is increased.

Description

technical field [0001] The invention belongs to the field of calcium carbide production, in particular, the invention relates to a system and method for producing calcium carbide. Background technique [0002] Calcium carbide (CaC 2 ), known as the mother of organic synthesis before the middle of last century. At present, it is mainly used to produce series products such as vinyl chloride, vinyl acetate and acrylic acid. More than 70% of PVC (polyvinyl chloride) production in China comes from calcium carbide acetylene. Calcium carbide plays a very important role in the economic development of our country. The output has been increasing in the past ten years, and the output in 2013 exceeded 22 million tons. [0003] The production process of semi-coke, the raw material of calcium carbide, is independent of the calcium carbide smelting process, which leads to the waste of sensible heat of high-temperature (400°C-800°C) semi-coke. At the same time, energy consumption and wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B32/942
CPCY02P20/10
Inventor 董宾丁力路丙川张顺利郭启海张佼阳许修强刘维娜赵小楠吴道洪
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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