Method for preparing water coke slurry from lignite char

A lignite semi-coke and water coke slurry technology, applied in the field of clean coal, can solve the problems of coal slurry with high content of oxygen-containing functional groups on the surface, increase the cost of pulping, etc., and achieve the effects of good fluidity, good effect, and wide sources

Inactive Publication Date: 2008-12-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to obtain coal-water slurry with good slurrying performance, the traditional raw materials for preparing coal-water slurry are generally high-rank coals such as bituminous coal and anthracite with less oxygen-containing functional groups on the surface. Coal slurry with good performance cannot be directly obtained due to the high content of functional groups
Chemical or physical pretreatment of lignite (Y.K.Leong, et al.RheologicaActa.32: 277-285 (1993)), although it can improve the slurry performance of coal water slurry, but also increases the cost of slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Semi-coke (Mad=4.3%) obtained by pyrolysis of lignite at 450°C is selected, and the dispersant is sodium naphthalenesulfonate formaldehyde condensation polymer, and the addition amount is 0.2wt%. Add the dispersant to a certain volume of water, and stir at a low speed until the dispersant is completely dissolved. Then slowly add the graded semi-coke to the water containing the dispersant one by one, while slowly increasing the rotation speed. When all the semi-coke is added to the water, increase the rotation speed to 1000rpm, and stir at a constant speed for 10 minutes to obtain the product water coke slurry. Then carry out the determination of stability, viscosity and concentration in sequence.

[0017] The properties of the obtained water coke slurry are shown in No. 1 in Table 1. The concentration of the water char slurry is 60.21%, the apparent viscosity is 550mPa.s, there is no water separation and no precipitation after 7 days, and the fluidity is good.

Embodiment 2

[0019] For semi-coke obtained at different pyrolysis temperatures, using different dispersants, different additions and different compounding ratios, the same experimental method as in Example 1 was used to prepare water coke slurry. See Table 1 for the concentration, apparent viscosity, and stability of the water char slurry (that is, the water separation rate after 7 days of storage and the form of precipitation after 7 days).

[0020] From the parameters such as the concentration, apparent viscosity and stability of the water-coke slurry, the water-coke slurry obtained in the example can meet the requirements of the coal-water slurry gasifier.

[0021] Table 1: Conditions and basic properties for preparing water coke slurry

[0022]

serial number

Dispersant

Amount added

(wt%)

Semi-coke temperature

(℃)

concentration

(%)

apparent viscosity

(mPa.s)

Analysis after 7 days

Water rate (...

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PUM

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Abstract

The invention belongs to the clean coal technical field and provides a method for preparing water coke slurry by using lignite semicoke as a raw material. The method is characterized in that: the lignite is pyrogenated at medium and low temperature to obtain semicoke which is taken as the raw material; sodium lignosulphonate, naphthalenesulfonic acid or composition of the sodium lignosulphonate and naphthalenesulfonic aci is used as a dispersant. Added with small amount of dispersant, the lignite semicoke can produce the water coke slurry with concentration of about 60 percent, excellent fluidity and stability, and being applicable to gasification. The method of the invention has the advantages of reducing the costs of the raw material and the dispersant in the process of slurrying on the premise of meeting the gasification requirements of the water coke slurry.

Description

technical field [0001] The invention belongs to the technical field of clean coal, and relates to a water coke slurry suitable for use in a large coal-water slurry gasifier and having good performance by using lignite semi-coke as a raw material and adding a single or compound compound as a dispersant. Background technique [0002] Coal water slurry refers to a coarse dispersion system containing 60% to 70% coal, 29% to 39% water and about 1% additives. It was first proposed by American scientists inspired by heavy oil gasification in the 1940s, with the aim of reducing the cost of pulverized coal gasification and reducing environmental pollution. With the reduction of petroleum resources and the continuous rise of oil prices, the research and industrialization of new coal chemical technology to produce liquid fuels and chemicals from coal has been widely valued, and coal gasification to produce syngas is the leader of new coal chemical industry. Among them, the large-scale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
Inventor 胡浩权樊义龙张秋民
Owner DALIAN UNIV OF TECH
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