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A method of increasing the concentration of crude coal water slurry

A technology of coal water slurry and concentration, which is applied in the petroleum industry, liquid carbon-containing fuel, fuel, etc., can solve the problem of very limited increase in concentration, and achieve the effects of low cost, energy saving, and huge economic benefits

Inactive Publication Date: 2016-01-27
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in China, particle size grading and selection of appropriate additives are mainly used to increase the concentration of coal water slurry, but the increase in concentration is very limited. Generally, the concentration of crude coal water slurry can only be increased by 3wt.% to 5wt.%.

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  • A method of increasing the concentration of crude coal water slurry
  • A method of increasing the concentration of crude coal water slurry
  • A method of increasing the concentration of crude coal water slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 Shown, when adopting fire tube heater 5 to improve crude coal-water slurry concentration, its concrete process step is:

[0046] (1) Pulverize the lignite to a particle size of <6 mm with the pulverizer 1, add water and send it to the coal mill 2 for preliminary wet grinding to make a crude coal water slurry, and obtain a crude coal water slurry in which coal and water are directly mixed without any treatment , the water-coal weight ratio in the crude coal-water slurry is about 3:1;

[0047] (2) At room temperature, the crude coal water slurry is sent to the casing heat exchanger 4 by the coal slurry pump 3 for preheating treatment. The temperature of the preheating treatment is 160°C and the pressure is 0.6MPa. The casing heat exchanger D The inlet temperature is 20°C; during preheating, the crude coal water slurry flows through the tube layer of the sleeve heat exchanger 4, and the water vapor passes through the shell layer of the sleeve heat exchang...

Embodiment 2

[0053] Such as figure 2 Shown, when adopting steam heater 12 to directly heat and improve crude coal-water slurry concentration, its concrete process steps are:

[0054] (1) Pulverize the lignite to a particle size of <6 mm with the pulverizer 1, add water and 0.5% additives by weight of the dry base coal, and send it to the coal mill 2 for preliminary wet grinding to make a crude water slurry, and measure the crude water The concentration of coal slurry is about 43wt.%;

[0055] (2) At room temperature, the crude coal water slurry is sent to the casing heat exchanger 4 by the coal slurry pump 3 for preheating treatment. The temperature of the preheating treatment is 280°C and the pressure is 6.4MPa. The casing heat exchanger 4 The inlet temperature is 30°C; during preheating, the crude coal water slurry flows through the tube layer of the sleeve heat exchanger 4, and the water vapor passes through the shell layer of the sleeve heat exchanger 4 to preheat the crude coal wate...

Embodiment 3

[0061] Such as image 3 Shown, when adopting steam heat exchanger 14 to improve crude coal water slurry concentration, its concrete processing step of the present invention is:

[0062] (1) Pulverize lignite with pulverizer 1 to obtain pulverized coal with particle size 6mm accounting for about 30% of the total weight. Mix the pulverized coal of the two particle sizes and add water into the Coal mill 2 performs preliminary wet grinding to make crude coal water slurry, and the concentration of the crude coal water slurry is measured to be about 41wt.%.

[0063] (2) At normal temperature, the crude coal water slurry is sent to the casing heat exchanger 4 by the coal slurry pump 3 for preheating treatment. The temperature of the preheating treatment is 260°C and the pressure is 4.7MPa. The casing heat exchanger 4 The inlet temperature is 70°C; during preheating, the crude coal water slurry flows through the tube layer of the sleeve heat exchanger 4, and the water vapor passes t...

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Abstract

The invention provides a method for increasing the concentration of coarse water coal slurry. The method comprises the following steps: (1) preheating the coarse water coal slurry at the preheating temperature of 160-280 DEG C and under the pressure of 0.6-6.4MPa; (2) heating the preheated coarse water coal slurry to a heat-preserving temperature, and preserving heat at the temperature of 200-320 DEG C and under the pressure of 1.5-11.3MPa; (3) standing the heat-preserved coarse water coal slurry for 10-90 minutes, preferably for 20-60 minutes; (4) performing flash evaporation on the stood coarse water coal slurry; and (5) filtering the coarse water coal slurry which is subjected to flash evaporation, adding an additive, and stirring the mixture to prepare water coal slurry with higher concentration.

Description

technical field [0001] The invention belongs to the technical field of coal treatment, in particular to a method for increasing the concentration of crude coal water slurry. Background technique [0002] Although my country's energy resources are relatively rich, their structure is unbalanced and unevenly distributed, showing the characteristics of "rich in coal, poor in oil, and low in gas". Coal accounts for about 70% of my country's primary energy production and 63% of total primary energy consumption, which is much higher than the world average. However, oil-based resources such as gasoline and diesel are in short supply, and oil is heavily dependent on imports. The problem has become a bottleneck restricting my country's economic and social development for a long time. Therefore, for a relatively long period of time in the future, coal energy utilization will still be the most important energy utilization method in China. No matter in terms of proportion or quantity, Ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32
Inventor 李春启梅长松康善娇刘卫兵刘鑫杨明顺郭俊奇齐永丽
Owner DATANG INT CHEM TECH RESINST