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

A technology of calcium carbide slag and calcium carbide, which is applied in chemical instruments and methods, hydrogen, bulk chemical production, etc., can solve the problems of raw material demand, waste of pyrolysis gas, etc., reduce raw material costs, rationally utilize resources, and improve heat utilization efficiency Effect

Inactive Publication Date: 2018-05-08
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using long-flame coal and calcium carbide slag as raw materials, the calcium carbide slag slurry is first added to the purification tank, and the CO-enriched gas delivered by the conversion unit is passed from the bottom of the purification tank to the purification tank while stirring continuously. 2 and H 2 Gas, adjust the pH of calcium carbide slag slurry to 8-11, carbonize calcium hydroxide, the main component in calcium carbide slag, into calcium carbonate, and impurity magnesium oxide react to become water-soluble magnesium bicarbonate. After preliminary precipitation, the carbonized solid is sent to the filter press device to reduce the water content to below 40%, and remove water-soluble impurities, and then the carbonized solid is sent to the mixer, and mixed with coal powder and binder according to 1.2 : 1:0.2 mass ratio mixing, after further stirring, press molding. The shaped balls are sent to the preheating furnace through the screw conveying device, and du...

Embodiment 2

[0045] Using long-flame coal and calcium carbide slag as raw materials, the calcium carbide slag slurry is first added to the purification tank, and the CO-enriched gas delivered by the conversion unit is passed from the bottom of the purification tank to the purification tank while stirring continuously. 2 and H 2 Gas, adjust the pH of calcium carbide slag slurry to 8-11, carbonize calcium hydroxide, the main component in calcium carbide slag, into calcium carbonate, and impurity magnesium oxide react to become water-soluble magnesium bicarbonate. After preliminary precipitation, the carbonized solid is sent to the filter press device to reduce the water content to below 40%, and remove water-soluble impurities, and then the carbonized solid is sent to the mixer, and mixed with coal powder and binder according to 1.8 : 1:0.03 mass ratio mixing, after further stirring, press molding. The shaped balls are sent to the preheating furnace through the screw conveying device, and d...

Embodiment 3

[0047] Using long-flame coal and calcium carbide slag as raw materials, the calcium carbide slag slurry is first added to the purification tank, and the CO-enriched gas delivered by the conversion unit is passed from the bottom of the purification tank to the purification tank while stirring continuously. 2 and H 2 Gas, adjust the pH of calcium carbide slag slurry to 8-11, carbonize calcium hydroxide, the main component in calcium carbide slag, into calcium carbonate, and impurity magnesium oxide react to become water-soluble magnesium bicarbonate. After preliminary precipitation, the carbonized solid is sent to the filter press device to reduce the water content to below 40%, and remove water-soluble impurities, and then transport the carbonized solid to the mixer, and mix it with coal powder and binder according to 1.5 : 1:0.13 mass ratio mixing, after further stirring, press molding. The shaped balls are sent to the preheating furnace through the screw conveying device, an...

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Abstract

The invention relates to a system and a method for preparing hydrogen-rich gas and calcium carbide from calcium carbide slag. The system includes a calcium carbide slag purification unit, a hybrid molding unit, a high-temperature pyrolysis unit, a catalytic reforming unit, a conversion unit, and a calcium carbide smelting unit. The carbide slag purification unit includes a CO2 carbonization unit and a filter press unit; the high-temperature pyrolysis unit includes a ball Inlet, outlet of raw coal gas and outlet of high temperature active pellets; catalytic reforming unit includes inlet of raw coal gas and outlet of synthesis gas and carbon dioxide; conversion unit includes inlet of synthesis gas and carbon dioxide and outlet of enriched CO2 and hydrogen; calcium carbide smelting unit includes high temperature active pellets The inlet and the calcium carbide outlet are used to smelt high-temperature active pellets into calcium carbide. The system and method for preparing hydrogen-rich gas and calcium carbide slag according to the present invention uses calcium carbide slag as a raw material, which not only reduces the cost of raw materials, makes full use of pyrolysis gas to carry sensible heat, but also simplifies the composition of pyrolysis gas, improves the utilization rate, and greatly improves The economics of calcium carbide production.

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 using powdery medium-low rank coal and quicklime as raw materials to press balls first, and then undergo pyrolysis to obtain high-temperature active pellets has been verified in industry. This process has made a major breakthrough in terms of raw material cost and thermal efficiency. However, in this process, the heat of the high-temperature active pellets after pyrolysis is fully utilized, while a large amount of heat carried by the raw coal 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/38C01B32/942
CPCY02P20/52
Inventor 刘维娜丁力赵小楠路丙川许修强吴道洪
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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