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A kind of dealkalization method of coal

A dealkalization and coal powder technology, applied in the field of coal dealkalization, can solve the problems of increasing alkali metal compounds, poor dealkalization effect, harsh reaction conditions, etc., and achieve simple process, improved dealkalization effect, and short treatment cycle Effect

Inactive Publication Date: 2018-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a coal dealkalization method, the purpose of which is to effectively increase the leaching of alkali metal compounds under mild conditions through the joint action of carbon dioxide and eluent , especially the leaching of organic alkali metal compounds, so as to effectively dealkalize, thereby solving the technical problems of poor dealkalization effect or harsh reaction conditions and high cost in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Crushing the raw coal to be dealkalized to obtain coal powder; the particle size of the coal powder is about 3mm.

[0030] (2) Mix the coal powder obtained in step (1) with the eluent in a mass ratio of 1:50, the eluent is an aqueous solution of ethanol, and the volume fraction of ethanol is 5%.

[0031] (3) Continuously feed carbon dioxide gas into the coal-water mixture obtained in step (2) to make it excessive, and stir for 24 hours at 20°C and 0.1MPa

[0032] (4) Use a filter device to separate the solid from the liquid, and dry the obtained solid to obtain dealkalized coal.

[0033] The method for determining the removal rate of alkali metals and alkaline earth metals is: use nitric acid and hydrogen peroxide as digestion agents to digest the dealkalized coal at 180 ° C, and measure the obtained leaching filtrate by ICP-OES (inductively coupled plasma atomic emission spectrometer analysis method) and the contents of alkali metal and alkaline earth metal ions in...

Embodiment 2

[0035] (1) Crushing the raw coal to be dealkalized to obtain coal powder; the particle size of the coal powder is about 3 mm.

[0036] (2) Mix the coal powder obtained in step (1) with the eluent in a mass ratio of 1:30, the eluent is an aqueous solution of ethanol, and the volume fraction of ethanol is 10%.

[0037] (3) Continuously feed carbon dioxide gas into the coal-water mixture obtained in step (2), make it excessive, and stir for 24 hours under the conditions of 40°C and 0.3MPa

[0038] (4) Use a filter device to separate the solid from the liquid, and dry the obtained solid to obtain dealkalized coal.

[0039]The method for determining the removal rate of alkali metals and alkaline earth metals is: use nitric acid and hydrogen peroxide as digestion agents to digest the dealkalized coal at 180 ° C, and measure the obtained leaching filtrate by ICP-OES (inductively coupled plasma atomic emission spectrometer analysis method) and the contents of alkali metal and alkaline...

Embodiment 3

[0041] (1) Crushing the raw coal to be dealkalized to obtain coal powder; the particle size of the coal powder is about 3 mm.

[0042] (2) Mix the pulverized coal obtained in step (1) with the eluent in a mass ratio of 1:80, the eluent is an aqueous solution of ethanol, and the volume fraction of ethanol is 20%.

[0043] (3) Continuously feed carbon dioxide gas into the coal-water mixture obtained in step (2) to make it excessive, and stir for 24 hours at 60°C and 0.1MPa

[0044] (4) Use a filter device to separate the solid from the liquid, and dry the obtained solid to obtain dealkalized coal.

[0045] The method for determining the removal rate of ethanol alcohol alkali metals and alkaline earth metals is: use nitric acid and hydrogen peroxide as digestion agents to digest the dealkalized coal at 180 ° C, and measure the leaching rate obtained by ICP-OES (Inductively Coupled Plasma Atomic Emission Spectrometry). The content of each alkali metal and alkaline earth metal ion ...

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Abstract

The invention discloses a coal dealkalization method. The method comprises the following steps: (1) grinding raw coal to be dealkalized to obtain coal powder; (2) mixing the coal power obtained in the step (1) with eluent to obtain a mixed solution of coal and water, wherein the eluent is a water solution of a water-soluble organic solvent and the volume fraction of the water-soluble organic solvent is in a range of 5 to 20%; introducing gas containing carbon dioxide into the coal-water mixed solution obtained in the step (2), stirring the mixed solution to soak and wash the coals for 3 to 24 hours at a temperature of 20 to 60 DEG C to make carbon dioxide become excess; (4) subjecting the coal-water mixed solution, which has been processed in the step (3) to solid-liquid separation to obtain solids, and finally drying the solids to obtain the dealkalized coal. The provided method has the advantages of good dealkalization effect, mild reaction conditions, simple technology, and low cost.

Description

technical field [0001] The invention belongs to the field of coal combustion, and more specifically relates to a coal dealkalization method. Background technique [0002] Alkali metal and alkaline earth metal compounds are widely distributed in coal, among which the compounds containing sodium and calcium account for the vast majority. Studies have shown that the high content of alkali metal and alkaline earth metal compounds in coal will bring a series of problems to the combustion of this kind of coal, such as ash accumulation, contamination and slagging, which greatly affect the safety of power plant boilers Economic Operation. As a typical sub-bituminous coal, this feature of Zhundong coal is particularly obvious. Its coal ash has a low melting point and high sodium and calcium content in the ash, especially the sodium content is as high as more than 4%, far exceeding the current domestic power consumption in my country. The average level of sodium in coal used (less th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/00
Inventor 李显薛毅王文慧张宗姚洪朱贤青肖黎
Owner HUAZHONG UNIV OF SCI & TECH
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