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A system and method for preparing hydrogen-rich gas and calcium carbide

A calcium carbide, hydrogen-rich technology, applied in chemical instruments and methods, hydrogen/syngas production, hydrogen and other directions, can solve the problems of heat loss, low utilization efficiency of pyrolysis gas, etc., to extend life, improve heat utilization efficiency, reduce The effect of carbon deposition

Active Publication Date: 2018-04-10
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention aims to provide a system and method for preparing hydrogen-rich gas and calcium carbide. The purpose of the system and method is to solve the problems of heat loss carried by pyrolysis gas and low utilization efficiency of pyrolysis gas when producing calcium carbide.

Method used

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  • A system and method for preparing hydrogen-rich gas and calcium carbide
  • A system and method for preparing hydrogen-rich gas and calcium carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using long-flame coal and quicklime added with 30wt% calcium carbide slag as raw materials, the raw coal particle size is first crushed to <1mm, and the calcium-based raw material particle size is crushed to <3mm by a crushing and grinding device; The mixture with a mass ratio of 1.0 is sent to a high-temperature pyrolysis device through a screw conveying device, and is pyrolyzed at 850°C for 25 minutes to obtain raw coal gas and high-temperature mixture powder. The raw coal gas is directly transported to the catalytic reforming conversion reactor at high temperature. The temperature in the reactor is kept at 800°C and the pressure is 2MPa. After catalytic conversion at 320°C in the furnace, the pyrolysis gas is finally composed of carbon dioxide and hydrogen, and then decarburized to obtain a high-concentration H2-rich gas; the high-temperature mixed powder is sent to the calcium carbide smelting unit through a closed heat preservation conveying equipment Inside, calci...

Embodiment 2

[0044] Using long-flame coal and quicklime with 20wt% calcium carbide slag as raw materials, first crush the raw coal particle size to 2 Gas; the high-temperature mixed powder is sent to the calcium carbide smelting unit through the airtight heat preservation conveying equipment, and the calcium carbide is produced by the oxygen thermal method at 2000 °C; after the subsequent reaction of the calcium carbide and water, a large amount of calcium carbide slag can be obtained, which can be recycled as the raw material for calcium carbide production after purification .

Embodiment 3

[0046] Using long-flame coal and quicklime with 40wt% calcium carbide slag as raw materials, first crush the raw coal particle size to 2 Gas; the high-temperature mixed powder is sent into the calcium carbide furnace through the airtight insulation conveying equipment, and the calcium carbide is generated by the oxygen thermal method at 2000 °C; after the subsequent reaction of the calcium carbide and water, a large amount of calcium carbide slag can be obtained, which can be recycled as the raw material for calcium carbide production after purification .

[0047] It can be seen from the above examples that the technical solution of the present invention solves the problem of waste of pyrolysis gas in the production of calcium carbide. Further, the present invention can also reduce the cost of calcium carbide raw materials and make full use of calcium carbide slag.

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Abstract

The invention relates to a system and a method for preparing hydrogen-rich gas and calcium carbide. The system comprises a high-temperature pyrolysis unit, a catalytic reforming unit, a conversion and decarbonizing unit and a calcium carbide smelting unit; the high-temperature pyrolysis unit comprises a coal powder inlet, a calcium-based raw material inlet, a raw gas outlet and a high-temperature mixed powder outlet; the catalytic reforming unit includes a raw gas inlet and a synthesis gas outlet; the conversion and decarbonizing unit comprises a synthesis gas inlet and a hydrogen-rich gas outlet; the calcium carbide smelting unit comprises a solid material inlet, a hydrogen-rich gas inlet and a calcium carbide outlet; the calcium carbide smelting unit is used for preparing the calcium carbide by oxygen thermal method; the solid material inlet is connected with the high-temperature mixed powder outlet of the high-temperature pyrolysis unit. According to the system and method for preparing hydrogen-rich gas and calcium carbide, heat of pyrolysis gas is applied, and pyrolysis gas with complex component is converted to be the hydrogen-rich gas.

Description

technical field [0001] The invention mainly relates to the production field of calcium carbide, in particular to a system and method for preparing hydrogen-rich gas and calcium carbide. Background technique [0002] The process of preparing calcium carbide by oxythermal method after pyrolysis of powdery medium-low rank coal and powdery quicklime as raw materials to obtain high-temperature active semi-coke has been extensively studied. This process has made a major breakthrough in terms of raw material cost and thermal efficiency. However, in this process, the heat of active semi-coke after pyrolysis is fully utilized, while a large amount of heat carried by raw gas is cooled and wasted in the subsequent separation process. In addition, in the continuously developed calcium carbide acetylene chemical process, calcium carbide reacts with water to produce a large amount of calcium carbide slag (the main component is calcium hydroxide). If it is not effectively utilized, it wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/942C01B3/38C01B3/48
CPCC01B3/38C01B3/48C01B2203/0233C01B2203/0283C01B2203/06C01B2203/1052C01B2203/1241C01B2203/14
Inventor 刘维娜丁力董宾郭启海张顺利路丙川吴道洪
Owner SHENWU ENVIRONMENTAL TECH CO LTD