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Pretreatment method of high-alkali coal

A high-alkali coal, pretreatment technology, applied in the petroleum industry, solid fuel, fuel and other directions, can solve the problems of restricting the mining and utilization of high-alkali coal in Xinjiang, ash deposition and high temperature corrosion, low ash melting point and so on

Active Publication Date: 2016-10-12
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

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Comparison scheme
Effect test

Embodiment 1

[0070] The same type of coal was used in Example 1 and Comparative Example 1, 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-alkaline coal is mixed with the aqueous solution, stirred at 60°C and 0.1MPa for 30 minutes, and dried to obtain The pretreated high-alkali coal, wherein the molar ratio of calcium ions in calcium hydroxide to 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 high alkali coal after described pretreatment is as shown in table 2:

[0072] Table 2

[0073] Deformation temperature DT

Softening temperature ST

Hemisphere temperature...

Embodiment 2

[0077] Described embodiment 2 adopts same coal type with described embodiment 1, and difference is, in embodiment 2, a certain amount of calcium hydroxide is dissolved in a certain amount of water at 20 ℃, obtains the aqueous solution of calcium hydroxide, will high Soda coal is mixed with the aqueous solution, stirred at 20°C and 1.5 MPa for 20 minutes, 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 is is 4, the mass ratio of the water to the high-alkali coal is 1, after the reaction, the conversion rate of carbon is 90%, the content of methane in the product gas is 18%, and no slagging phenomenon is found in the reaction process.

Embodiment 3

[0079] Described embodiment 3 and described embodiment 1 adopt same kind of coal, and difference is, in embodiment 3, a certain amount of calcium hydroxide is dissolved in a certain amount of water at 95 ℃, obtains the aqueous solution of calcium hydroxide, and high Soda coal is mixed with the aqueous solution, stirred at 200°C and 0.2 MPa 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 the high-alkali coal is 2, the mass ratio of the water to the high-alkali coal is 1, after the reaction, the conversion rate of carbon is 91%, the content of methane in the product gas is 17%, and no slagging phenomenon is found in the reaction process.

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Abstract

The invention relates to the field of catalytic coal gasification, in particular to a pretreatment method of high-alkali coal. The method can make the alkali metal in high-alkali coal exist in the form of an alkali metal salt with catalytic activity so as to improve the catalytic activity of catalytic high-alkali coal gasification, and also can reduce slagging. The pretreatment method of high-alkali coal provided by an embodiment of the invention includes: stirring high-alkali coal in the presence of calcium ions existing in the form of calcium-oxygen bond and water, carrying out ion exchange reaction on the oxygen-containing functional group on the surface of the high-alkali coal and the calcium ions existing in the form of calcium-oxygen bond, then carrying out ion exchange reaction on calcium ions exchanged to the surface of the high-alkali coal and alkali metal ions in the high-alkali coal, and performing drying to obtain the treated high-alkali coal with the surface rich in K-O-C active intermediate. The embodiment of the invention can be applied to 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] Coal resources in Xinjiang are rich in reserves, mainly of 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, and the high content of potassium salt and sodium salt 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 ...

Claims

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Application Information

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