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Organic solvent modified brown coal and method of preparing high-concentration coal water slurry

A technology of organic solvents and high-concentration water, which is applied in the petroleum industry, liquid carbon-containing fuels, fuels, etc., can solve the problems of large heat source or mechanical energy consumption, poor operability, and high operating costs, so as to achieve reduced usage costs, easy storage, good stability effect

Inactive Publication Date: 2013-10-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods of modification and treatment of lignite often cost a lot, high operating costs, consume a lot of heat or mechanical energy, and have poor operability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An organic solvent-modified lignite and a method for preparing a high-concentration coal water slurry, including three steps of mixing lignite with an organic solvent, separating the two, and preparing a coal water slurry. After the lignite and the organic solvent are mixed in a mass-volume ratio of 1g / 5ml, It is added to a closed reaction kettle and reacted under certain operating conditions; after the completion of the reaction, the dried lignite and the separated liquid are obtained by liquid-solid separation, and the separated liquid is dehydrated and filtered to obtain the organic solvent and sent to the storage tank for later use. The lignite used in this case has a moisture content of 40% and a calorific value of 3000kcal / kg.

[0034] The specific steps are:

[0035] (1) Pre-crush lignite so that its particle size does not exceed 0.5mm;

[0036] (2) Mix lignite and organic solvent in a mass ratio of 1g / 5ml and add them to the reactor for processing. The operating param...

Embodiment 2

[0042] A method for modifying lignite with organic solvent, including two steps of mixing lignite and organic solvent and separating the two. After lignite and organic solvent are mixed according to a mass-volume ratio of 1g / 10ml, they are added to a closed reactor under certain operating conditions. Reaction: After the reaction, the dried lignite and the separated liquid are obtained through liquid-solid separation, and the separated liquid is dehydrated and filtered to obtain an organic solvent and sent to a storage tank for later use. The lignite used in this case has a moisture content of 30% and a calorific value of 3900kcal.

[0043] The specific steps are:

[0044] (1) Pre-crush lignite so that its particle size does not exceed 0.5mm;

[0045] (2) Mix lignite and organic solvent according to a certain mass ratio (1g / 10ml), and add them to the reactor for processing. The operating parameters of the reactor: pressure is 8MPa, temperature is 350°C, and reaction time is 45min;

[...

Embodiment 3

[0051] A method for modifying lignite with organic solvent, including two steps of mixing lignite and organic solvent and separating the two. After lignite and organic solvent are mixed according to a mass-volume ratio of 1g / 7ml, they are added to a closed reactor under certain operating conditions. Reaction: After the reaction, the dried lignite and the separated liquid are obtained through liquid-solid separation, and the separated liquid is dehydrated and filtered to obtain an organic solvent and sent to a storage tank for later use. The lignite used in this case has a moisture content of 35% and a calorific value of 3500kcal.

[0052] The specific steps are:

[0053] (1) Pre-crush lignite so that its particle size does not exceed 0.5mm;

[0054] (2) Mix lignite and organic solvent in a certain mass ratio (1g / 7ml), and add them to the reactor for processing. The operating parameters of the reactor: pressure is 5MPa, temperature is 250°C, and reaction time is 30min;

[0055] (3) Pu...

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Abstract

The invention discloses an organic solvent modified brown coal and a method of preparing high-concentration coal water slurry. The method comprises mixing the brown coal and the organic solvent, separating the brown coal and the organic solvent and preparing the coal water slurry; concretely comprising mixing the brown coal and the organic solvent, adding into a enclosed reaction vessel, reacting for 20-45 minutes under a pressure of 2-8 MPa and a temperature of 150-350 DEG C, performing liquid-solid separation for the mixture after the reaction finishes to obtain dried and quality-improved brown coal and a separating liquid, and dehydrating and filtering the separating liquid to regain the organic solvent which is sent into a storage tank for later use, with the modified brown coal being used for preparing the coal water slurry. The invention provides a novel chemical solvent modification method for dehydration of the brown coal; the method has characteristics of high brown coal dehydration efficiency and recyclable organic solvent, does not generate waste water and exhaust gas, is simple in technology; the coal water slurry prepared by the method is high in concentration, good in stability, free of adding dispersants and stabilizing agents, and easy for large-scale popularization.

Description

Technical field [0001] The invention belongs to the technical field of lignite modified drying technology and clean coal, and specifically relates to an organic solvent modified lignite and a method for preparing a high-concentration coal water slurry. Background technique [0002] Lignite is the coal with the lowest degree of coalification. Lignite has high porosity and strong reactivity. The oxygen content in coal is about 15%-30%, most of which exist in the form of oxygen-containing functional groups, with phenolic hydroxyl, carboxyl and Mainly carbonyl. The moisture content of lignite is relatively high, generally about 30%-60%, and the volatile content is greater than 37%. The calorific value of lignite is generally about 3000kcal / kg. It is easy to weather and break and spontaneously combust. It is not suitable for long-distance transportation, making lignite The industrial application of coal is dominated by coal production areas. [0003] Lignite is a low-grade coal. Becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
Inventor 刘猛段钰锋马贵林
Owner SOUTHEAST UNIV
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