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Preparation method of high-concentration gasified coal water slurry

A gasification coal-water slurry and high-concentration technology, applied in the field of coal chemical industry, can solve the problems of low gasification efficiency and utilization of raw coal resources, and achieve the effects of improving resource utilization efficiency, good environmental and social benefits, and improving gasification activity

Inactive Publication Date: 2020-04-07
SHANXI LUAN COAL BASED SYNTHETIC OIL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of the prior art, and proposes a high-concentration gasification coal-water slurry preparation technology, the purpose of which is to prepare high-concentration gasification coal-water slurry to solve the problem of gasification by improving the gasification activity of raw coal and reducing its ash melting point. Resource Utilization of Raw Coal with Low Efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Crush the Lu'an coal to 0.1mm, mix it with ethanol and pump it into the supercritical stirring reactor. Reaction conditions Temperature: 413.9K, pressure: 8.14Mpa; continuous reaction for 0.5h.

[0030] 2) The material from the reactor is filtered, separated and depressurized, and the solid is sent to Ca(OH) 2 The turbid liquid is stirred for ion exchange for 1 hour; the liquid is reused after separating the tar. Ca(OH) 2 The concentration of turbid liquid is 2mol / L. The air is isolated during the reaction to prevent Ca(OH) 2 carbonation.

[0031] 3) After the ion-exchanged coal material is filtered and dried, it is sent to a rod mill for grinding and pulping, and an appropriate amount of additives are added according to the ash content of Lu’an coal. The additives used are CaO and sodium methylnaphthalenesulfonate, and the mass ratio is 1: 1. The ash content of No. 1 Lu'an coal is 5%, the amount of additive added is 2% of the Lu'an coal, the ash melting point i...

Embodiment 2

[0034] 1) Crush the Lu'an coal to 0.1mm, mix it with ethanol and pump it into the supercritical stirring reactor. Reaction conditions Temperature: 450.9K, pressure: 5.8Mpa; continuous reaction for 0.4h.

[0035] 2) The material from the reactor is filtered, separated and depressurized, and the solid is sent to Ca(OH) 2 Ion exchange in the turbid liquid stirred tank for 1.3h; the liquid is reused after separating the tar. Ca(OH) 2 The concentration of turbid liquid is 2.2mol / L. Vacuum treatment during the reaction to prevent Ca(OH) 2 carbonation.

[0036] 3) After the ion-exchanged coal material is filtered and dried, it is sent to a rod mill for grinding and pulping, and an appropriate amount of additives are added according to the ash content of Lu’an coal. The additives used are CaO and sodium methylnaphthalenesulfonate, and the mass ratio is 1: 1. The ash content of No. 2 Lu'an coal is 7.5%, the amount of additive added is 3% of the Lu'an coal, the ash melting point is...

Embodiment 3

[0039] 1) Crush the Lu'an coal to 0.1mm, mix it with ethanol and pump it into the supercritical stirring reactor. Reaction conditions Temperature: 700K, pressure: 7Mpa; continuous reaction for 0.5h.

[0040] 2) The material from the reactor is filtered, separated and depressurized, and the solid is sent to Ca(OH) 2 The turbid liquid is stirred for ion exchange for 1 hour; the liquid is reused after separating the tar. Ca(OH) 2 The concentration of turbid liquid is 1.9mol / L. Vacuum treatment during the reaction to prevent Ca(OH) 2 carbonation.

[0041] 3) After the ion-exchanged coal material is filtered and dried, it is sent to a rod mill for grinding and pulping, and an appropriate amount of additives are added according to the ash content of Lu’an coal. The additives used are CaO and sodium methylnaphthalenesulfonate, and the mass ratio is 1: 1. The ash content of No. 3 Lu'an coal is 10%, the amount of additive added is 5% of the Lu'an coal, the ash melting point is adjus...

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Abstract

Belonging to the field of coal chemical industry, the invention relates to a preparation method of high-concentration gasified coal water slurry. The method includes: mixing coal with ethanol, then carrying out reaction in a supercritical stirring reaction kettle, carrying out ion exchange on the separated solid in a Ca(OH)2 turbid liquid stirring kettle, and then adding an additive of CaO and sodium methylnaphthalene sulfonate to obtain a finished product coal water slurry; wherein the total amount of the additive is determined according to the mass of ash in the coal, the ash fusion point iscontrolled at 1300-1400DEG C, and the ash viscosity is smaller than or equal to 250Pa.s. The method is suitable for producing the gasified coal water slurry with a coal material with high coalification degree, poor gasification activity and high ash fusion point. The method provided by the invention can improve the gasification activity of the coal material and lower the ash fusion point, not only can expand the gasification utilization way of the coal material, improve the resource utilization efficiency, but also has good environmental benefits and social benefits at the same time.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, in particular to a method for preparing high-concentration gasified coal-water slurry. Background technique [0002] Coals in different regions or environments have different coalification degrees, gasification activities, and ash melting points. Raw coals with high coalification degrees, poor gasification activities, and high ash melting points can only be used in fixed-bed gasifiers with low efficiency. Today's coal gasification technology is developing towards large-scale, and the entrained bed gasifier has become the mainstream of gasification technology development due to its high gasification efficiency, environmental protection and cleanliness. [0003] For coal slurry for gasification, the concentration of coal slurry, reactivity and ash melting point are the three main indicators that restrict the selection of coal for pulping. The concentration of coal slurry determines the gasifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
CPCC10L1/32
Inventor 李昌伦谭代福张一波魏亚军刘伟张成黄潜
Owner SHANXI LUAN COAL BASED SYNTHETIC OIL
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