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Water-coal-slurry prepared by using benzene extraction residual liquid and preparation method of water-coal-slurry

A technology for extracting raffinate and coal-water slurry, which is applied in the field of petrochemical industry, can solve the problems of low gasification reaction temperature and large waste water discharge, achieve high carbon conversion rate, reduce discharge, and avoid high oxygen consumption

Pending Publication Date: 2020-11-24
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

The advantage of this method is that it can treat high-concentration organic waste liquid (COD content 100000mg / L). The disadvantage is that the gasification reaction temperature is relatively low. The amount of discharge is large, and further treatment is required at the discharge sewage treatment plant

Method used

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  • Water-coal-slurry prepared by using benzene extraction residual liquid and preparation method of water-coal-slurry
  • Water-coal-slurry prepared by using benzene extraction residual liquid and preparation method of water-coal-slurry
  • Water-coal-slurry prepared by using benzene extraction residual liquid and preparation method of water-coal-slurry

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specific Embodiment approach

[0059] Such as Figure 1 to Figure 2 Shown, for the present invention utilizes the concrete embodiment that the coal-water slurry prepared by benzene extraction raffinate is applied to the gasification process, comprises the following steps:

[0060] 1) Preparation of mixed coal

[0061] The first flat belt 22 for anthracite and the second flat belt 23 for bituminous coal are sent to the coal blending device 21 according to a certain ratio to prepare mixed coal, and then sent to the rod mill 2 by the third flat belt 24 . The coal blending device is equipped with a belt scale, PLC control system, and an impeller-type coal feeder with adjustable speed. The weight mixing ratio between bituminous coal and anthracite is adjusted by PLC, and the mixed coal with ash content Aad8-20%, ash melting point 1300-1450 DEG C and internal water Mad less than 6% is prepared.

[0062] The bituminous coal is selected to use Shenyou 2# bituminous coal produced by Shenhua Company with low ash co...

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Abstract

The present invention discloses water-coal-slurry prepared by using benzene extraction residual liquid and a preparation method of the water-coal-slurry. The water-coal-slurry comprises the followingcomponents in parts by weight: 600-800 parts of mixed coal, 150-400 parts of benzene extraction residual liquid and 0.1-10 parts of an additive; the mixed coal is composed of bituminous coal and anthracite, and the weight ratio of the bituminous coal to the anthracite is 5:1 to 1:5. The benzene extraction waste liquid is used to replace fresh water, the anthracite and bituminous coal are mixed, the prepared water-coal-slurry has no corrosion to rod mills, good slurryability and high ash melting point, a water-wall gasifier is used to gasify the water-coal-slurry, gasification reaction temperature is high, oxygen consumption is low, carbon conversion rate is high, COD content and sewage discharge of discharged gasified sewage of the gasifier are low, resource utilization of the benzene extraction residual liquid is realized, and at the same time, adaptability of coal types is improved.

Description

technical field [0001] The invention relates to a coal-water slurry prepared by using benzene extraction raffinate and a preparation method thereof, belonging to the technical field of petrochemical industry. Background technique [0002] Caprolactam is an important organic chemical raw material. In my country, caprolactam is mainly produced by cyclohexanone ammoximation. The Beckmann rearrangement process unit of the cyclohexanone ammoximation method produces a large amount of benzene extraction raffinate. The appearance of the benzene extraction raffinate is light red transparent liquid with a slight odor, strong acidity (pH value 3-6), large yield, complex composition (ammonium sulfate content 5-7%, caprolactam content 0.2-1.0%), COD It is characterized by high content (50-150g / L), and is a typical refractory high-concentration organic waste liquid. Taking a caprolactam plant with an annual output of 300,000 tons as an example, the output of benzene extraction raffinat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32C10L1/24
CPCC10L1/324C10L1/2437C10L1/2475
Inventor 宋星星何建辉叶莲祥黄敬相立中胡元旭旷志刚毛伟王贵顺蒋葱蓝马芳
Owner CHINA PETROLEUM & CHEM CORP
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