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A kind of pretreatment method of high alkali coal

A high-alkali coal pretreatment technology, applied in the direction of solid fuel, petroleum industry, fuel, etc., can solve the problems of no catalytic activity, low ash melting point, ash deposition and high temperature corrosion

Active Publication Date: 2019-03-15
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Coal resources in Xinjiang are rich in reserves, and are mainly lignite with low metamorphism, long-flame coal and weakly caking coal. Among them, Huaidong Coalfield is currently the largest integrated coalfield in my country. Since Huaidong Coalfield is an oceanic sedimentary coalfield, The primary minerals in coal contain a large amount of alkali metals and alkaline earth metals. The high content of potassium and sodium salts is called high-alkali coal. This kind of coal has a low ash melting point, and there are slagging, ash and The problem of high temperature corrosion, and most of the potassium in this coal exists in the form of potassium aluminosilicate, potassium sulfate, potassium sulfide and potassium chloride, and there is no catalytic activity when used in coal catalytic gasification reaction, thus limiting Mining and Utilization of High Alkali Coal in Xinjiang

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The Example 1 and the Comparative Example 1 used the same coal type, and the high-alkali coal was pretreated by the pretreatment method provided in the embodiment of the present invention.

[0071] Specifically, a certain amount of calcium hydroxide is dissolved in a certain amount of water at 60°C to obtain an aqueous solution of calcium hydroxide, the high-alkali coal is mixed with the aqueous solution, stirred at 60°C, 0.1MPa for 30 minutes, and dried to obtain The high-alkali coal after pretreatment, wherein the molar ratio of calcium ions in calcium hydroxide to the alkali metal ions in the high-alkali coal is 0.5, the mass ratio of the water to the high-alkali coal is 0.5, and the treated The water content of high alkali coal is less than or equal to 5%. The ash melting point of the pretreated high-alkali coal is shown in Table 2:

[0072] Table 2

[0073] Deformation temperature DT

Softening temperature ST

Hemisphere temperature HT

Flow temperature FT

1500

>15...

Embodiment 2

[0077] The embodiment 2 and the embodiment 1 use the same coal type. The difference is that in the embodiment 2, a certain amount of calcium hydroxide is dissolved in a certain amount of water at 20°C to obtain an aqueous solution of calcium hydroxide. Alkali coal is mixed with the aqueous solution, stirred for 20 min at 20° C., 1.5 MPa, and dried to obtain pretreated high-alkali coal, wherein the molar ratio of calcium ions in calcium hydroxide to alkali metal ions in the high-alkali coal It is 4, the mass ratio of the water to the high-alkali coal is 1, the carbon conversion rate is 90% after the reaction, the methane content in the product gas is 18%, and no slagging phenomenon is found during the reaction.

Embodiment 3

[0079] The example 3 and the example 1 use the same coal, the difference is that in Example 3, a certain amount of calcium hydroxide is dissolved in a certain amount of water at 95°C to obtain an aqueous solution of calcium hydroxide, Alkali coal was mixed with the aqueous solution, stirred at 200°C and 0.2MPa for 30 minutes, and dried to obtain pretreated high-alkali coal, wherein the molar ratio of calcium ions in calcium hydroxide to alkali metal ions in said high-alkali coal It is 2, the mass ratio of the water to the high-alkali coal is 1. After the reaction, the carbon conversion rate is 91%, the methane content in the product gas is 17%, and no slagging phenomenon is found during the reaction.

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Abstract

The invention relates to the field of coal catalytic gasification, in particular to a pretreatment method for high-alkali coal. The alkali metal in the high-alkali coal can be present in the form of alkali metal salt with catalytic activity, the catalytic activity of the catalytic gasification of the high-alkaline coal can be improved, and slagging can also be reduced. An embodiment of the present invention provides a pretreatment method for high-alkali coal, which includes: stirring the high-alkali coal in the presence of calcium ions in the form of calcium-oxygen bonds and water, so that the oxygen-containing functional groups on the surface of the high-alkali coal and the The calcium ions existing as calcium-oxygen bonds undergo an ion exchange reaction, and then, the calcium ions exchanged to the surface of the high-alkali coal coal undergo an ion-exchange reaction with the alkali metal ions in the high-alkali coal, and dry to obtain the processed High-alkali coals rich in K‑O‑C active intermediates on the coal surface. The embodiment of the present invention is applied to the pretreatment of high-alkali coal.

Description

Technical field [0001] The invention relates to the field of coal catalytic gasification, in particular to a pretreatment method for high-alkali coal. Background technique [0002] Xinjiang is rich in coal resources, and is dominated by low-grade lignite, long-flame coal and weakly caking coal. Among them, the Huaidong coal field is currently the largest monolithic coal field in China. Because the Huaidong coal field is a marine sedimentary coal field, The primary minerals in coal contain a large amount of alkali metals and alkaline earth metals. The high content of potassium salt and sodium salt is called high-alkali coal. The ash melting point of this kind of coal is low, and there are slagging, ash accumulation and ash formation during combustion and gasification. The problem of high-temperature corrosion, and most of the potassium in this coal exists in the form of potassium aluminosilicate, potassium sulfate, potassium sulfide and potassium chloride, and it has no catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/02
CPCC10L9/02
Inventor 毛燕东刘雷李克忠
Owner ENN SCI & TECH DEV