Method for cogenerating activated carbon and hydrogen by coal char gasification and methane reforming coupling technology

A coal char gasification and activated carbon technology, which is applied in chemical instruments and methods, bulk chemical production, hydrogen/synthesis gas production, etc., can solve problems that have not been seen yet, achieve hydrogen yield, and strengthen gasification reactivity , a wide range of effects

Active Publication Date: 2016-07-27
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Up to now, there have been no technical reports on "combining the high-value utilization of coal coke w

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The semi-coke from Yulin in northern Shaanxi (the bulk semi-coke from Wuzhou Coal Chemical Co., Ltd., Shenmu County, the same below) was taken as the sample raw material of coal coke, which was crushed and sieved into particles of 70-150 μm. According to the mass ratio of 1:1, weigh the coal char particles and Na 2 CO 3 (analytical pure), and simultaneously added to the water-ethanol binary solution (the volume ratio of water and ethanol is 5:1), stirred and mixed for 10 h, and then vacuum-dried to form mixture A.

[0030] Then, the mixture A with a mass of 5g is used as a catalyst for the steam reforming reaction of methane, and reacted in two traditional parallel fixed-bed reactors, and the conditions for regulating the steam reforming reaction of methane are: the temperature range is 900°C , the pressure is 0.1MPa, the molar ratio of methane to water vapor is 1:5, and the methane flow rate is 25mL / min. Collect the gas generated by the steam reforming of methane to ...

Embodiment 2

[0032] The semi-coke from Yulin in northern Shaanxi was taken as the sample raw material of coal coke, which was crushed and sieved into particles of 180-300 μm. According to the mass ratio of 1:5, weigh the coal char particles and KOH (analytical grade, the same below), and add them into the water-ethanol binary solution (the volume ratio of water and ethanol is 5:1) at the same time, and stir and mix After 10 h, mixture A was formed by drying in vacuo. Then, the mixture A with a mass of 5 g is used as a catalyst for the steam reforming reaction of methane, and reacted in two traditional parallel fixed-bed reactors, and the conditions for regulating the steam reforming reaction of methane are: the temperature range is 850 ° C , the pressure is 2.0MPa, the molar ratio of methane to water vapor is 1:4, and the flow rate of methane is 25mL / min. Collect the gas generated by the steam reforming of methane to obtain hydrogen-rich gas; under this condition, within 4 hours of reacti...

Embodiment 3

[0034] The semi-coke from Yulin in northern Shaanxi was taken as the sample raw material of coal coke, which was crushed and sieved into particles of 70-150 μm. According to the mass ratio of 1:10, weigh coal char particles and CaO (analytical pure, the same below), carry out mechanical stirring and grinding, so that the two are fully mixed to form mixture A. Then, the mixture A with a mass of 5 g is used as a catalyst for the steam reforming reaction of methane, and reacted in three traditional parallel fixed-bed reactors, and the conditions for regulating the steam reforming reaction of methane are: the temperature range is 650°C , the pressure is 1.0MPa, the molar ratio of methane to water vapor is 1:4, and the methane flow rate is 25mL / min. Collect the gas generated by the steam reforming of methane to obtain hydrogen-rich gas; under this condition, within 4 hours of reaction, the methane conversion rate is 76.83% to 83.68%, and the hydrogen gas fraction in the reaction ga...

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Abstract

The invention discloses a method for cogenerating activated carbon and hydrogen by a coal char gasification and methane reforming coupling technology. The method comprises the following steps: crushing coal char and mixing the coal char with a modifier evenly at the mass ratio of 1 to (0.1-10) to form a mixture; utilizing the mixture as a catalyst for steam reforming reaction of methane, wherein the conditions of regulating and controlling the steam reforming reaction of the methane are as follows: the temperature range is 500-950 DEG C; the pressure is 0-4MPa; and the molar ratio of the methane to steam is 1 to (1-6); collecting the gas generated by steam reforming reaction of the methane to obtain a hydrogen-rich gas; and controlling the standing time in the process of the steam reforming reaction of the methane to be 1-6 hours and then cooling the residues below 100 DEG C to obtain the activated carbon. According to the method, the targets of strengthening the gasification reactivity of the coal char and achieving targeted improvement of hydrogen yield and cogeneration of an activated carbon product can be achieved; and the method has the characteristics of being relatively wide in raw material application range, mild in technological conditions, high in hydrogen purity, low in equipment investment cost, convenient to operate, large-scale in production and the like.

Description

technical field [0001] The invention belongs to the field of conversion and utilization of coal and natural gas, and in particular relates to a method for co-producing activated carbon and hydrogen through a coupling process of coal coke gasification and methane reforming. Background technique [0002] Coal pyrolysis is a potential way of high-quality and efficient transformation of coal, which can produce tar, gas and semi-coke. It has become an important industry to be upgraded or planned to be implemented in northern Shaanxi, Inner Mongolia, Xinjiang and other regions in my country. As of 2014, only the coal pyrolysis semi-coke (referred to as coal coke, locally called "semi-coke") in the Yulin area of ​​northern Shaanxi has built a production capacity of 49.46 million tons, and the output has reached 26.3 million tons. However, with the overall downturn of the global economy, the coal coke industry is facing the problem of overcapacity and the urgent need for high-value ...

Claims

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Application Information

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IPC IPC(8): C01B3/40C01B31/10B01J27/232B01J23/02B01J23/04B01J27/138
CPCY02P20/52C01B3/40B01J23/02B01J23/04B01J27/138B01J27/232C01B2203/0233
Inventor 张建波雷一挺甘娟娟任梦园马晓迅
Owner NORTHWEST UNIV
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