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Method for preparing coal water slurry by modifying low-rank coal

A low-rank coal and coal-water slurry technology is applied in the field of low-rank coal modification to prepare coal-water slurry, which can solve the problems of unfavorable slurry formation, large investment, and difficulty in producing high-concentration coal-water slurry, and achieve resource utilization value maximized effect

Inactive Publication Date: 2020-01-17
CCTEG CLEAN ENERGY CO LTD
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Problems solved by technology

[0003] Due to the high internal water content of low-rank coal, rich oxygen-containing functional groups on the surface, and strong hydrophilicity, it is not conducive to slurry formation. It is difficult to produce high-concentration coal-water slurry, and the low concentration of coal-water slurry will cause oxygen consumption during the gasification process. high coal consumption and low gasification efficiency
The research on preparing high-concentration coal-water slurry by modifying low-rank coal as raw material has been paid attention to. At present, the existing methods include hydrothermal modification and pyrolysis modification. The process is complicated and the investment is large, which is not conducive to Large-scale industrial application of low-rank coal to prepare high-concentration coal-water slurry

Method used

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  • Method for preparing coal water slurry by modifying low-rank coal

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Embodiment 1

[0048] This embodiment provides a method for preparing coal-water slurry by modifying Xinjiang long-flame coal (full water is 18%, and the high calorific value of the water-containing ash-free base is 23MJ / kg), and the described method specifically includes the following steps:

[0049] (I) 117.07kg of Xinjiang long-flame coal was crushed by a hammer crusher until the average particle size was 6mm, and then divided into the first raw material and the second raw material according to the mass, wherein the mass of the first raw material was 11.82kg, and the mass of the second raw material It is 105.25kg. The first raw material, water and additives are finely ground and pulped in a vertical agitating fine mill to obtain a low-rank coal slurry. The mass ratio of the dry basis of the first raw material to the additive is 100:0.5, and the additive used is water content 3% sodium lignosulfonate, the mass percentage of the prepared low-rank coal slurry is 35.5%, the average particle s...

Embodiment 2

[0054] This embodiment provides a method for preparing coal-water slurry by modifying Inner Mongolian lignite (33% of total water, hydrated and ash-free base with a high calorific value of 19MJ / kg), and the method specifically includes the following steps:

[0055] (I) 129.16kg of low-rank coal is crushed by double rollers until the average particle size is 8mm, and then divided into the first raw material and the second raw material according to the mass, wherein the mass of the first raw material is 90.45kg, and the mass of the second raw material is 38.71kg . The first raw material, water and additives are finely ground and pulped in a vertical agitating fine mill to obtain a low-rank coal slurry. The mass ratio of the dry basis of the first raw material to the additive is 100:0.35, and the additive used is water content 9% naphthalenesulfonic acid formaldehyde condensate, the mass percentage of the prepared low-rank coal slurry is 50%, the average particle size of the low-...

Embodiment 3

[0060] This embodiment provides a method for preparing coal-water slurry by modifying Ningxia non-stick coal (full water is 20%, and the high-level calorific value of the water-containing ash-free base is 22MJ / kg). The method specifically includes the following steps:

[0061] (I) 126.9kg of low-rank coal is crushed by a hammer crusher to an average particle size of 5 mm and then divided into the first raw material and the second raw material by mass, wherein the mass of the first raw material is 25.35 kg, and the mass of the second raw material is 101.55 kg kg. The first raw material, water and additives are finely ground and pulped in a vertical agitating fine mill to obtain a low-rank coal slurry. The mass ratio of the dry basis of the first raw material to the additive is 100:0.2, and the additive used is naphthalenesulfonate Acid-formaldehyde condensate, the mass percentage of the prepared low-rank coal slurry is 40%, the average particle size of the low-rank coal slurry ...

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Abstract

The invention provides a method for preparing coal water slurry by modifying low-rank coal. The method comprises a step of mixing and pulping low-rank coal slurry and modified low-rank coal to obtainthe coal water slurry. The method specifically comprises the following steps: (1) crushing the low-rank coal, dividing the crushed low-rank coal into a first raw material and a second raw material, performing wet pulping on the first raw material to obtain the low-rank coal slurry, and sequentially drying and modifying the second raw material to obtain the modified low-rank coal; and (II) performing wet pulping on the low-rank coal slurry and the modified low-rank coal to obtain the coal water slurry. Through physical and chemical modification modes, the content of oxygen-containing functionalgroups on the surface of the low-rank coal is reduced, reabsorption of the low-rank coal is inhibited, and the porosity of the low-rank coal is reduced, so the highest slurry concentration of the low-rank coal is improved.

Description

technical field [0001] The invention belongs to the technical field of pulping, and relates to a method for preparing coal-water slurry, in particular to a method for preparing coal-water slurry by modifying low-rank coal. Background technique [0002] my country has abundant low-rank coal reserves, but due to the characteristics of high moisture, low calorific value, easy weathering and spontaneous combustion, the transportation cost is high, which is not conducive to long-distance transportation and storage. Direct combustion of low-rank coal has low thermal efficiency and large greenhouse gas emissions, making it difficult to develop and utilize on a large scale. With the improvement of energy conservation and environmental protection awareness, clean and efficient utilization of coal has become an inevitable requirement for the development of China's coal chemical industry. Therefore, using low-rank coal to prepare high-concentration coal-water slurry has become one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32C10L1/24C10L1/188C10L1/185C10L1/16
CPCC10L1/14C10L1/143C10L1/1691C10L1/1852C10L1/1883C10L1/2437C10L1/326C10L2290/24C10L2290/28
Inventor 何国锋吕向阳张胜局赵力明柳金秋孙海勇王冉陈浩徐明磊段静刘烨炜严健张孝雨
Owner CCTEG CLEAN ENERGY CO LTD
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