Method for preparing high-alkali coal water slurry from coking wastewater

A technology for coking wastewater and coal-water slurry, which is applied in the petroleum industry, liquid carbon-containing fuels, fuel additives, etc., can solve the problems of low concentration of coal-water slurry, unsatisfactory gasification efficiency, and easy sedimentation of pulverized coal. Meet process requirements, achieve low-cost treatment, and improve gasification efficiency

Active Publication Date: 2022-03-18
新疆中泰创新技术研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using high-alkali coal to prepare coal-water slurry, the existing additives for coal-water slurry are unsuitable in many aspects, such as high cost, low concentration of the prepared coal-water slurry, poor fluidity, and easy coal powder Settlement, and unsatisfactory gasification efficiency, etc.

Method used

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  • Method for preparing high-alkali coal water slurry from coking wastewater
  • Method for preparing high-alkali coal water slurry from coking wastewater
  • Method for preparing high-alkali coal water slurry from coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] When preparing coal-water slurry, the high-alkali coal is used as Wucaiwan coal in Zhundong, Xinjiang, which is ground and sieved to a particle size below 200 μm. The industrial analysis and ash composition of the Wucaiwan coal are shown in Table 1 and Table 2 below, respectively.

[0035]

[0036] Table 1 Wucaiwan Coal Industry Analysis / %

[0037] Table 1, M ar Indicates coal moisture, FC ar Indicates that coal fixes carbon, A ar Indicates coal ash content, V daf Indicates coal volatiles.

[0038]

[0039] Table 2 Ash composition analysis / %

[0040] From the ash composition in Table 2, the content of alkali metal Na in Wucaiwan coal is much higher than that of ordinary coal.

[0041] The coking waste water that adopts, through testing, the content of ammonia nitrogen in it is 2684mg / L, the content of phenols is 3105mg / L, COD (chemical oxygen demand) is 21000mg / L.

[0042] The additives that adopt include 2 parts of stabilizing agent (below unless otherwise ...

Embodiment 2

[0045] When preparing coal-water slurry, the high-alkaline coal is made of Xinjiang Zhundong Wucaiwan coal, which is ground and sieved to a particle size below 200 μm.

[0046] The coking waste water that adopts, through testing, the content of ammonia nitrogen in it is 2684mg / L, the content of phenols is 3105mg / L, COD (chemical oxygen demand) is 21000mg / L.

[0047] The additives that adopt include 1 part of stabilizer, 0.05 part of dispersant, 0.07 part of emulsifier and 3 parts of concentration of formaldehyde solution, wherein the stabilizer adopts polyacrylamide, and the dispersant includes 6 parts of sodium lignosulfonate and 4 parts sodium naphthalenesulfonate, emulsifiers include 8 parts acetic acid and 2 parts sulfuric acid.

[0048] During preparation, the above 60 parts of Wucaiwan coal powder smaller than 200 μm, 30 parts of coking wastewater and 4 parts of additives were stirred at 80° C. to make coal water slurry.

[0049] In Example 2, the prepared coal-water sl...

Embodiment 3

[0051] When preparing coal-water slurry, the high-alkaline coal is made of Xinjiang Zhundong Wucaiwan coal, which is ground and sieved to a particle size below 200 μm.

[0052] The coking waste water that adopts, through testing, the content of ammonia nitrogen in it is 2684mg / L, the content of phenols is 3105mg / L, COD (chemical oxygen demand) is 21000mg / L.

[0053] The additives that adopt include 3 parts of stabilizer, 0.2 part of dispersant, 0.08 part of emulsifier and 5 parts of concentration of formaldehyde solution, wherein the stabilizer adopts polyacrylamide, and the dispersant includes 5.5 parts of sodium lignosulfonate and 3.5 parts sodium naphthalene sulfonate, emulsifier consisting of 7 parts acetic acid and 1.5 parts sulfuric acid.

[0054]During preparation, the above 63 parts of Wucaiwan coal powder smaller than 200 μm, 37 parts of coking wastewater and 5 parts of additives were stirred at 85° C. to make coal water slurry.

[0055] In Example 3, the prepared co...

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Abstract

The invention discloses a method for preparing high-alkali coal water slurry from coking wastewater. The method comprises the following steps: mixing and stirring high-alkali coal powder, coking wastewater and three additives to prepare the coal water slurry; the additives comprise a stabilizer, a formaldehyde aqueous solution, a dispersant, an emulsifier and the like. Compared with the prior art, the method has the advantages that low-cost treatment of coking wastewater and viscose wastewater can be realized while the coal water slurry is prepared from the high-alkali coal, the gasification efficiency of the obtained coal water slurry is remarkably improved, and meanwhile, the obtained coal water slurry has relatively ideal slurry concentration, stability and flowability; and the process requirements of the gasification furnace can be better met.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry, and in particular relates to a method for preparing high-alkali coal-water slurry from coking wastewater. Background technique [0002] High-alkali coal refers to coal with a high content of alkali metal Na in coal. It is distributed in the Zhundong region of Xinjiang, my country, with huge reserves of more than 390 billion tons. The Zhundong coalfield is the largest integrated coalfield in my country, and it has unique advantages to carry out coal conversion processes such as coal power and coal chemical industry in Zhundong and surrounding areas. However, high-alkali coal also has some disadvantages. For example, when it is used as power coal, it will cause different degrees of contamination and slagging on the heating surface of the boiler, which affects the application range of high-alkali coal to a certain extent. [0003] Making high-alkali coal into coal-water slurry helps to ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32C10L1/238C10L1/185C10L1/24C10L1/188C10L1/12C10L10/18
CPCC10L1/326C10L1/10C10L10/18C10L1/2381C10L1/1852C10L1/1857C10L1/2437C10L1/1881C10L1/1275C10L2290/24C10L2300/20
Inventor 黄戈高翔谢天加依娜·库力斯坦马艳丽马晓欣谭瀚茗姚元宏马雄亚
Owner 新疆中泰创新技术研究院有限责任公司
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