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Method for preparing water coal semicoke grout by coal dust filling modification and grading technology

A semi-coke and modification technology, which is applied in the field of coal powder filling modification and grading technology to prepare water-coal semi-coke slurry, can solve the problem that the clean and efficient utilization of semi-coke cannot be solved, the void structure of semi-coke is not improved, and the energy utilization efficiency is low. and other problems, to achieve the effect of good industrial application prospects, improved performance, and simple pulping process

Pending Publication Date: 2017-11-17
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not improve the void structure of semi-coke, and the energy utilization efficiency is low, which cannot solve the problem of large-scale clean and efficient utilization of semi-coke.

Method used

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  • Method for preparing water coal semicoke grout by coal dust filling modification and grading technology
  • Method for preparing water coal semicoke grout by coal dust filling modification and grading technology
  • Method for preparing water coal semicoke grout by coal dust filling modification and grading technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 As shown, the dry basis ratio of coarse coal powder, fine powder and semi-coke is 40:40:20, and the dry basis dosage of dispersant accounts for 5‰ of the total dry basis. The coal is crushed by a jaw crusher and passed through a 14-mesh sieve to obtain a coarse powder, and the coal on the sieve is ball-milled to obtain a fine coal slurry. Weigh 144.6g Yankuang coal fine slurry (52.6% concentration, 25.3μm average particle size), add 3.2g 30% dispersant and 38.1g water, add 38.0g dried semi-coke and 76.1g water while stirring g Yankuang coal coarse powder, after the feeding is completed, stir quickly for 10 minutes to prepare the water coal / semi-coke slurry filled with modified Xinjiang semi-coke with Yankuang coal grading. Weigh 143.2g Zhundong coal fine slurry (47.6% concentration, average particle size 23.4μm), add 2.8g 30% dispersant and 51.7g water, add 34.1g dried semi-coke and 68.2 g Zhundong coal coarse powder, after the addition of materials, stir...

Embodiment 2

[0025] see figure 1 As shown, the dry basis ratio of coarse coal powder, fine powder and semi-coke is 40:30:30, and the dry basis dosage of dispersant accounts for 8‰ of the total dry basis. The coal is crushed by a jaw crusher and passed through a 14-mesh sieve to obtain a coarse powder, and the coal on the sieve is ball-milled to obtain a fine coal slurry. Weigh 121.4g Pingyi coal fine slurry (42.2% concentration, average particle size 19.3μm), add 4.5g 30% dispersant and 54.6g water, add 51.2g dried semi-coke and 68.3g Pingyi Coal Coarse Powder, after the feeding is completed, stir rapidly for 10 minutes to prepare Pingyi Coal graded filled modified Inner Mongolia semi-coke water coal / semi-coke slurry. Weigh 121.6g Erlin rabbit coal fine slurry (concentration is 41.3%, average particle size 18.7μm), then add 4.5g 30% dispersant and 56.7g water, add 50.2g dried semi-coke and 67.0g while stirring g Erlin Rabbit Coal Coarse Powder, and then quickly stir for 10 minutes after ...

Embodiment 3

[0030] see figure 1As shown, the dry basis ratio of coarse coal powder, fine powder and semi-coke is 40:35:25, and the dry basis dosage of dispersant accounts for 7‰ of the total dry basis. The coal is crushed by a jaw crusher and passed through a 14-mesh sieve to obtain a coarse powder, and the coal on the sieve is ball-milled to obtain a fine coal slurry. Weigh 147.8g of Daliuta coal fine slurry (40.5% concentration, 22.3μm average particle size), add 4.0g 30% dispersant and 37.0g water, add 42.8g dried semi-coke and 68.4 g Daliuta coal coarse powder, after the addition of the material, stir rapidly for 10 minutes to prepare the water coal / semi-coke slurry filled with modified Shaanxi semi-coke with Daliuta coal grading. Weigh 138.2g Yulin coal fine slurry (concentration is 43.7%, average particle size 21.4μm), add 4.0g 30% dispersant and 45.7g water, add 43.1g dried semi-coke and 69.0g Yulin coal coarse powder was stirred rapidly for 10 minutes after the feeding was compl...

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Abstract

The invention discloses a method for preparing water coal semicoke grout by coal dust filling modification and a grading technology. The method comprises a step 1) of preparing coarse coal powder and fine coal grout, wherein the coarse coal powder is obtained by causing coal to be smashed through a crusher and then sieved through a 14-mesh sieve; the fine coal grout is obtained by the coal to be smashed through the crusher and undergo ball milling, the fine coal grout comprises fine coal dust, the concentration of the fine coal grout is 40%-60%, and the average grain diameter of the fine coal dust is smaller than or equal to 35 [mu]m; a step 2) of weighing the coarse coal powder, the fine coal grout and the semicoke according to a dry basis proportion of (2-5):(2-5):(2-3), adding water and dispersing agent in the fine coal grout obtained in the step 1), adding the coarse coal dust and the semicoke with stirring and finishing the operaitn in 5 min, and finally performing stirring for 5-10 min to obtain water coal semicoke grout with the viscosity of 500-1500 mPa.S. The method for preparing water coal semicoke grout by coal dust filling modification and the grading technology is simple in pulping process, improves water coal / semicoke grout performances including concentration and stability, the problem that plenty of semicoke is generated in a coal low-temperature dry distillation utilization technology and cannot be subjected to efficient clean utilization is solved, and the method has good industrial application prospect.

Description

technical field [0001] The invention relates to a method for preparing water-coal semi-coke slurry by coal powder filling modification and grading technology. Background technique [0002] China is a country rich in coal, poor in oil, and low in gas. Coal is the basic energy structure of our country. However, the traditional coal utilization method has low energy utilization rate and serious pollution, so the development of clean coal technology is an inevitable choice. Coal chemical industry is an effective measure to achieve clean utilization and ensure national energy security through coal conversion, so it is particularly important in our country. my country is rich in low-rank coal reserves, and low-grade bituminous coal such as long-flame coal, weakly caking coal, and non-caking coal accounts for 42.46% of the total. The characteristics lead to: 1) it is not convenient for long-distance transportation, 2) it is impossible to prepare high-concentration coal-water slurr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
CPCC10L1/326C10L2290/24C10L2290/28C10L2290/146
Inventor 胡柏星何其慧田万成顾思云
Owner NANJING UNIV
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