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Water coal slurry preparing method

A coal-water slurry and weight technology, which is used in the field of low-rank coal, such as lignite to prepare high-concentration coal-water slurry and gasification water-based coal-water slurry, can solve problems such as limited effect of increasing concentration and unreachable lignite coal-water slurry concentration.

Active Publication Date: 2015-09-23
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can increase the concentration of low-rank coal-water slurry by at least 3%. It prepares coal powders of two different particle sizes through two vertical mills and grades them to increase the concentration of coal-water slurry. However, this process The effect of increasing the concentration is limited. If this technique is adopted, the concentration of the prepared lignite coal-water slurry still cannot reach the requirement of gasification coal-water slurry concentration-57% by weight or more

Method used

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preparation example Construction

[0019] The preparation method of a coal-water slurry involved in the present invention belongs to the category of high-efficiency utilization of coal, especially low-rank coal. At the same time, the present invention also provides a method for preparing high-concentration coal-water slurry for gasification from lignite. The process principle is: after the raw coal is dried, at least part of the pore structure inside the raw coal is destroyed and / or compressed by strong extrusion, resulting in a significant reduction in the volume of the pores and greatly reducing the ability of these pores to absorb water, thereby The slurry concentration of raw coal has been greatly improved.

[0020] Because low-rank coal, such as lignite, has abundant internal pores and relatively large porosity, the above method is particularly suitable for preparing high-concentration gasification water-coal slurry from low-rank coal, such as lignite. The method of the invention can increase the concentra...

Embodiment 1

[0026] High-concentration coal-water slurry was prepared by wet process using lignite from Baorixile in Inner Mongolia as raw material. In % by weight, the chemical composition of the lignite is as follows in Table 1 (dry basis):

[0027] Table 1

[0028] C

H

O

N

S

Ash

Volatile matter

64.18

4.45

16.86

0.99

0.33

13.19

43.39

[0029] The lignite raw material was pulverized to the following particle size distribution (PSD) with a conventional pulverizer: 90 wt% coal particle size < 3 mm; 100 wt % coal particle size < 6 mm; the pulverized lignite raw material was dried to moisture content by a conventional jet drier <12% by weight; dried lignite calorific value is about 17,541 joules / gram. The drying temperature of the lignite raw material is lower than 120°C, the heat source of the dryer comes from waste heat flue gas with a temperature lower than 200°C, and the drying time is 45 minutes.

[0030] The above-m...

Embodiment 2

[0036] High-concentration coal-water slurry was prepared by dry process using lignite from Tongliao, Inner Mongolia as raw material. In % by weight, the chemical composition of the lignite is as follows in Table 2 (dry basis):

[0037] Table 2

[0038] C

H

O

N

S

Ash

Volatile matter

[0039] 63.67

5.24

14.71

1.13

0.32

10.42

48.83

[0040] The lignite feedstock was pulverized to the following particle size distribution (PSD) using a conventional pulverizer: 85% by weight coal particle size < 3mm; 100% by weight coal particle size < 6mm; the pulverized lignite feedstock was dried to moisture content by a conventional jet dryer <10% by weight; dry lignite calorific value is about 16,146 joules / gram. The drying temperature of the lignite raw material is lower than 120°C, the heat source of the dryer comes from waste heat flue gas with a temperature lower than 200°C, and the drying time is 45 minutes....

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Abstract

The invention discloses a water coal slurry preparing method and particularly discloses a method for preparing high-concentration water coal slurry by using low-rank coal, such as brown coal. The water coal slurry is especially suitable as water coal slurry for gasification. The water coal slurry preparing method sequentially comprises the following steps of 1 smashing and drying coal, 2 extruding smashed and dried coal so as to destroy and / or seal at least one part of a pore structure of the coal and reduce water absorption of pores formed in the coal, 3 adopting a wet method or a dry method to grind the extruded coal and preparing the extruded coal into the water coal slurry, wherein a dispersing agent is added into the coal or the water coal slurry at a grinding stage or a water coal slurry preparing stage.

Description

technical field [0001] The present invention relates to a preparation method of coal-water slurry, in particular to a method for preparing high-concentration coal-water slurry from low-rank coal, such as lignite, and the coal-water slurry is particularly suitable as coal-water slurry for gasification. Background technique [0002] Coal water slurry is a high-quality gasification raw material widely used in coal chemical industry. In my country's coal resources, lignite and other low metamorphic coals have high volatile content and are suitable for gasification, but they have high water content and poor grindability, making it difficult to produce high-concentration coal-water slurry suitable for gasification. [0003] For example, lignite is mostly dull, with a true density of 1.10-1.40g / cm 3 , moisture up to 30% to 60%, high volatile content, high ash content, low ignition point, non-bonding, easy weathering and deterioration, strong chemical reactivity, poor thermal stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
Inventor 何立新朱书全赵振新初茉褚良
Owner CHNA ENERGY INVESTMENT CORP LTD
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