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Fluxing agent for improving melting of powder coal gasification ash

A technology of flux and ash, which is applied in the direction of granular/powder fuel gasification, fuel additives, petroleum industry, etc., to achieve the effects of improving flow characteristics, increasing effective utilization, and broadening the scope of use

Inactive Publication Date: 2013-08-28
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the liquid slagging gasification technology has strict requirements on the ash melting point, the ash melting point is greater than 1500 o The application of C coal is limited. Therefore, it is an urgent technical problem to be solved in the prior art to find an effective flux to reduce the melting point of coal ash to meet the requirements of liquid slagging gasification technology.

Method used

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  • Fluxing agent for improving melting of powder coal gasification ash

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] The composition and content of the ash sample after burning straw (corn) is 6.13% by weight of alkali metal oxides, SiO 2 The content of 58.55%, TiO 2 The content of 0.04%, Fe 2 0 3 The content of CaO is 2.65%, the content of CaO is 10.19%, and the balance is MgO. The flux has a silicon to aluminum ratio of 7.05. The ash melting point measurement of mixed ash samples obtained by adding flux to adjust the silicon-aluminum ratio of coal ash 1, coal ash 2 and coal ash 3 showed that the flux significantly improved the ash of coal ash 1, coal ash 2 and coal ash 3. melting point, reducing the melting point of coal ash to 1350 o Below C, the drop rate is greater than 150 o c.

Embodiment approach 2

[0020] The composition and content of the ash sample after burning straw (wheat) was 25.31% by weight of alkali metal oxides, SiO 2 The content of 55.32%, TiO 2 The content of 0.08%, Fe 2 0 3 The content of CaO is 0.73%, the content of CaO is 6.14%, and the balance is MgO. The flux has a silicon to aluminum ratio of 29.34. The ash melting point measurement of mixed ash samples obtained by adding flux to adjust the silicon-aluminum ratio of coal ash 1, coal ash 2 and coal ash 3 showed that the flux significantly improved the ash of coal ash 1, coal ash 2 and coal ash 3. melting point, reducing the melting point of coal ash to 1350 o Below C, the drop rate is greater than 150 o c.

Embodiment approach 3

[0022] The composition and content of the ash sample after burning straw (rice) was 23.26% by weight of alkali metal oxide, SiO 2 The content of 74.67%, TiO 2 The content of 0.09%, Fe 2 0 3 The content of CaO is 0.85%, the content of CaO is 3.01%, and the balance is MgO. The flux has a silicon to aluminum ratio of 71.80. The ash melting point measurement of mixed ash samples obtained by adding flux to adjust the silicon-aluminum ratio of coal ash 1, coal ash 2 and coal ash 3 showed that the flux significantly improved the ash of coal ash 1, coal ash 2 and coal ash 3. melting point, reducing the melting point of coal ash to 1350 o Below C, the drop rate is greater than 150 o c.

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Abstract

The invention relates to a fluxing agent for improving melting of powder coal gasification ash. Straw ash is used as the fluxing agent. The fluxing agent is prepared from the following components in percentage by weight: 5.00-40.00% of alkali metal oxide, at least 23.48% of SiO2, at most 2.63% of TiO2, at most 14.14% of Fe2O3, at least 1.34% of CaO and the balance of MgO. The fluxing agent has the typical characteristics of high silica-alumina ratio (7.00-80.00) and high alkali metal oxide content (5.00-40.00%). The fluxing agent can improve the melting characteristic of powder coal gasification ash, lowers the melting point of the coal ash, effectively solves the technical problem that high ash melting point coal can not be used for gasification in a slag tapping gasifier, implements theslag tapping, and has the advantage of low price since crop straws are used as the raw material.

Description

technical field [0001] The present invention is related to the melting flux of pulverized coal gasification ash, more auspiciously speaking, it uses straw ash as a flux to reduce the melting point of ash produced in the process of coal gasification and is mixed in coal. Background technique [0002] my country has large reserves of coal resources with high ash melting point, among which the ash melting point is greater than 1500 o Coal C accounts for 50% of the total coal resources. If the resources are used rationally, not only can the utilization rate of coal be effectively improved, but also the energy shortage situation can be alleviated. [0003] Coal gasification technology is developing in the direction of high temperature and high pressure, and liquid slag gasification technology is gradually occupying a dominant position. Due to the strong adaptability of this technology to coal types, the selectivity of coal types has been broadened, but the melting point of coal a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L10/06C10J3/46
Inventor 李凡张庆庚崔晓曦左永飞白永辉郝巧铃
Owner TAIYUAN UNIV OF TECH