Method for modifying lignite

A technology of upgrading and lignite, which is applied in the petroleum industry, liquid carbon-containing fuels, fuels, etc., and can solve the problems of poor slurrying performance and low calorific value of lignite

Inactive Publication Date: 2010-06-30
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects in the above-mentioned fields, the present invention provides a lignite upgrading method, which solves the problems of low calorific value and poor slurry-forming performance of lignite, and at the same time can make full use of energy in the upgrading process to realize the recycling of heat and water

Method used

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Examples

Experimental program
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Embodiment 1

[0038] as attached figure 1 As shown, the raw material lignite is made into coal-water slurry by crusher and coal mill, and the coal-water slurry is sent to the loop reactor after being pressurized. The raw material coal-water slurry is sent into the casing, and the hot coal slurry after reaction is sent into the inner tube for heat exchange. In order to further increase the temperature of the coal slurry, an electromagnetic heater is installed outside the front end of the loop reactor, and the coal water slurry stays in the loop reactor for 15 to 35 minutes. The conditions depend on the properties of the lignite and the particle size of the coal-water slurry) After the reaction, the hot coal slurry enters the inner tube of the loop heat exchanger, and the temperature drops below 100°C and enters the settling tank. Add the settling agent into the settling tank, the clear water in the upper layer of the settling tank is sent to the coal mill, and the coal water slurry with hig...

Embodiment 2

[0040] as attached figure 2 As shown, the raw material lignite is made into coal-water slurry by crusher and coal mill, and the coal-water slurry is sent to the loop reactor after being pressurized, and a direct-connected loop heat exchanger without casing is installed in front of the loop reactor , using electromagnetic heating to heat the coal-water slurry to the reaction temperature. The coal-water slurry stays in the loop reactor for 15-35 minutes, and the hot coal slurry after reaction enters the loop reactor at a pressure of 6.0-12.0MPa and a temperature of 200-320°C (operating conditions depend on the properties of the lignite and the particle size of the coal-water slurry). The inner tube of the tube heat exchanger and the coolant of the ring tube heat exchanger are boiler feed water and cooling water. In the ring tube heat exchanger, the boiler water is heated and then sent to the steam drum to generate steam. The coal water slurry cooled by the boiler water Then it...

Embodiment 3

[0042] as attached image 3 As shown, the raw material lignite is made into coal-water slurry by crusher and coal mill, and the coal-water slurry is sent to the loop reactor after being pressurized. The raw material coal-water slurry is sent into the casing, and the hot coal slurry after reaction is sent into the inner tube for heat exchange. In order to further increase the temperature of the coal slurry, an electromagnetic heater is installed outside the front end of the loop reactor to heat the coal-water slurry to the reaction temperature. The coal-water slurry stays in the loop reactor for 15-35 minutes at a pressure of 6.0-12.0MPa and a temperature of 200-320°C (the operating conditions depend on the properties of the lignite and the particle size of the coal-water slurry). After the reaction, the hot coal slurry enters the inner tube of the loop heat exchanger, the temperature drops below 100°C and enters the settling tank, and the settling agent is added to the settli...

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Abstract

The invention relates to a method for modifying lignite, belonging to the technical field of coal processing. In the method, the lignite is broken, sent into a coal mill, and is ground into coal pulp after water is added. Due to high content of internal water of the lignite, the concentration of the water-coal-slurry is relatively low, generally 30-55%. Modified water-coal-slurry is obtained after treatment under high temperature and pressure, wherein the internal water of lignite particles in the modified water-coal-slurry is reduced, and the water used for lubrication among the particles is more than needed water content of the water-coal-slurry. Measure of settlement or/and other specific measure, is/are needed to separate the excess water, and the concentration of the water-coal-slurry is increased from 30-50% to 50-70%, thereby increasing the calorific value of the lignite.

Description

technical field [0001] The invention relates to the technical field of coal treatment, in particular to a method for improving the calorific value and slurry-forming performance of lignite. Background technique [0002] China's energy structure is characterized by more coal and less oil. Coal accounts for more than 68% of primary energy and is an indispensable major resource. In China's recoverable coal reserves, lignite accounts for more than 13%. Lignite, also known as firewood coal, is the mineral coal with the lowest degree of coalification. A brown-black, dull, low-rank coal between peat and bituminous coal. Because of its high volatile content, it burns easily and gives off smoke. Due to the short age of coal formation, lignite has characteristics different from other coals: high internal water content, low calorific value, low thermal efficiency when used in boilers; low slurry concentration when used in coal-water slurry gasifiers Item consumption will increase. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
Inventor 顾大地张建胜
Owner TSINGHUA UNIV
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