System and method for preparing hydrogen-rich gas and calcium carbide from calcium carbide slag

A technology of calcium carbide slag and calcium carbide, applied in chemical instruments and methods, hydrogen/synthesis gas production, hydrogen, etc., can solve problems such as raw material demand and waste of pyrolysis gas, reduce raw material cost, increase reaction contact area, increase heat The effect of utilization efficiency

Active Publication Date: 2016-12-21
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention aims to provide a system and method for preparing hydrogen-rich gas and calcium carbide from calcium carbide slag. The purpose of the system and method is to solve the problems of pyrolysis gas waste and raw material demand in the production of calcium carbide, so as to reduce the cost of calcium carbide raw materials. cost

Method used

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  • System and method for preparing hydrogen-rich gas and calcium carbide from calcium carbide slag
  • System and method for preparing hydrogen-rich gas and calcium carbide from calcium carbide slag

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Using long-flame coal and calcium carbide slag as raw materials, the calcium carbide slurry is first added to the purification tank, and CO-enriched gas is introduced from the bottom of the purification tank while stirring continuously. 2 and H 2 Gas, adjust the pH of the calcium carbide slurry to 8-11. Calcium hydroxide, the main component in calcium carbide slag, is carbonized into calcium carbonate, while the impurity magnesium oxide is reacted into water-soluble magnesium bicarbonate. After the carbonized solid is preliminarily precipitated, it is sent to the drying device, and is subjected to heat exchange and drying with the countercurrent flue gas at 200°C to obtain the dried carbonized solid. Then the dried carbonized solid is sent to the pyrolysis unit, mixed with coal powder at a mass ratio of 1.2:1, and pyrolyzed at 900°C for 30 minutes to obtain raw coal gas and high-temperature mixed powder. The raw coal gas is directly transported to the catalytic reform...

Embodiment 2

[0043] Using long-flame coal and calcium carbide slag as raw materials, the calcium carbide slurry is first added to the purification tank, and CO-enriched gas is introduced from the bottom of the purification tank while stirring continuously. 2 and H 2 Gas, adjust the pH of the calcium carbide slurry to 8-11. Calcium hydroxide, the main component in calcium carbide slag, is carbonized into calcium carbonate, while the impurity magnesium oxide is reacted into water-soluble magnesium bicarbonate. After the carbonized solid is preliminarily precipitated, it is sent to the drying device, and is subjected to heat exchange and drying with the countercurrent flue gas at 200°C to obtain the dried carbonized solid. Then the dried carbonized solid is sent to the pyrolysis unit, mixed with coal powder at a mass ratio of 1.8:1, and pyrolyzed at 900°C for 30 minutes to obtain raw coal gas and high-temperature mixed powder. The raw coal gas is directly transported to the catalytic reform...

Embodiment 3

[0045] Using long-flame coal and calcium carbide slag as raw materials, the calcium carbide slurry is first added to the purification tank, and CO-enriched gas is introduced from the bottom of the purification tank while stirring continuously. 2 and H 2 Gas, adjust the pH of the calcium carbide slurry to 8-11. Calcium hydroxide, the main component in calcium carbide slag, is carbonized into calcium carbonate, while the impurity magnesium oxide is reacted into water-soluble magnesium bicarbonate. After the carbonized solid is preliminarily precipitated, it is sent to the drying device, and is subjected to heat exchange and drying with the countercurrent flue gas at 200°C to obtain the dried carbonized solid. Then the dried carbonized solid is sent to the pyrolysis unit, mixed with coal powder at a mass ratio of 1.5:1, and pyrolyzed at 900°C for 30 minutes to obtain raw coal gas and high-temperature mixed powder. The raw coal gas is directly transported to the catalytic reform...

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Abstract

The invention relates to a system and method for preparing hydrogen-rich gas and calcium carbide from calcium carbide slag. The system comprises a calcium carbide slag purification unit, a high-temperature pyrolysis unit, a catalytic reforming unit, a conversion unit and a calcium carbide smelting unit. The calcium carbide slag purification unit comprises a CO2 carbonization unit and a drying unit. The high-temperature pyrolysis unit comprises a pulverized coal inlet, a dried carbonization solid inlet, a crude gas outlet and a high-temperature mixed powder outlet. The catalytic reforming unit comprises a crude gas inlet and a synthetic gas and carbon dioxide outlet. The conversion unit comprises a synthetic and carbon dioxide inlet and a rich CO2 and hydrogen outlet. The calcium carbide smelting unit comprises a high-temperature mixed powder inlet and a calcium carbide outlet and is used for smelting high-temperature mixed powder into calcium carbide. By means of the system and method for preparing the hydrogen-rich gas and calcium carbide from the calcium carbide slag, the calcium carbide slag is utilized, and pyrolysis gas with complex components is converted into 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 from calcium carbide slag. 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 ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/38C01B31/32
CPCC01B3/382C01B2203/0238
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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