Method for continuous conversion of low-rank coal in subcritical water or supercritical water

A technology for supercritical water and low-rank coal, which is used in the preparation of liquid hydrocarbon mixtures, petroleum industry, solid solvent extraction, etc., to achieve the effects of simple process, short residence time and fast reaction speed.

Active Publication Date: 2004-11-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Method for continuous conversion of low-rank coal in subcritical water or supercritical water

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Embodiment 1

[0030] The Xiaolongtan lignite with a water content of 14.8% is pulverized to 74 microns and mixed with water to form a 24.8wt% coal-water slurry and placed in the storage tank 2 . When the experiment started, the inlet valve 15 of the boiling coal slurry pump 4, the power switch of the boiling coal slurry pump 4, started the coal water slurry pump 4, and adjusted the flow rate to 4.5 kg / hour, and the coal water slurry was boosted to 24.5MPa; open the inlet valve 14 of the water pump 3, close the system outlet valve 8, start the water pump 3, adjust the flow rate of the water pump to 6.0 kg / hour, the water is boosted to 24.5MPa by the water pump 3, and preheated to 520 by the water preheater 5 ℃. The weight ratio of water to coal is about 9:1. After the temperature and pressure of each point in the system are stabilized, when the outlet pressure of the coal-water slurry pump is balanced with the system pressure of 24.5MPa, the outlet valve 16 of the boiling coal-water slurry ...

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Abstract

The invention discloses a process for preparing coal water slurry or the mixture of coal water slurry with alkaline metal and / or alkaline earth oxides or hydroxides by the method of low level coal continuous transformation in subcritical or supercritical water which comprises, conducting continuous high pressure conveying of coal water slurry, charging into reaction system, usting the peculiarity of the hypercritical water to extracting and pyrolising low grade coal, converting it into useful product in gas, liquid and solid forms.

Description

Technical field: [0001] The invention belongs to a method for converting low-rank coal, in particular to a method for continuously converting low-rank coal into liquid fuel, high calorific value gas and active semi-coke under sub- and supercritical water conditions. Background technique: [0002] Low-rank coals are coals with relatively low degrees of peatization and coalification during coal formation. Among the low-rank coals, lignite is a type of coal with a calorific value of 3500-4000 kcal / kg, no caking, high volatile content and high moisture content. China's lignite reserves amount to 126 billion tons, accounting for 14% of the country's total coal reserves. Peat is a combustible organic mineral composed of water, minerals and organic matter, with a large water content. China's total reserves of peat resources amount to 4.7 billion tons, which is an important potential energy source. Lignite and peat are not suitable for long-distance transportation due to their hi...

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Application Information

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IPC IPC(8): B01D11/02C10G1/00C10G1/04
Inventor 毕继诚孙东凯程东明张荣赵玉龙
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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