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Method for preparing gasified coal water slurry by utilizing lignite

A technology of gasifying coal water slurry and coal water slurry, which is applied in the direction of granular/powder fuel gasification, special form dry distillation, liquid carbon-containing fuel, etc., can solve the problems of fragility, combustion, and low ignition point of lignite, and achieve improvement The effect of utilization

Inactive Publication Date: 2010-12-15
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

However, lignite has a low ignition point and is brittle, and local overheating often occurs during the drying process, causing combustion
In addition, lignite will quickly absorb moisture in the air after conventional drying, and restore or approach the original moisture content level, making the pulping property worse again

Method used

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  • Method for preparing gasified coal water slurry by utilizing lignite
  • Method for preparing gasified coal water slurry by utilizing lignite
  • Method for preparing gasified coal water slurry by utilizing lignite

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Embodiment Construction

[0019] In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] Coal water slurry is a new type of coal-based fuel that replaces oil with coal. It is mainly used to replace heavy oil for industrial boilers and kilns. The preparation of fuel coal-water slurry generally adopts bituminous coal and anthracite coal with good slurrying properties. However, bituminous coal is more expensive, making the cost of CWS too high. Anthracite is not only expensive, but also has poor combustibility of coal-water slurry. Therefore, the application of coal-water slurry is limited at present. First, a description of the relevant terminology:

[0021] coal water slurry

[0022] Coal water slurry is to use coal with abundant reserves and low price as the main raw material, and use flotation clean coal...

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Abstract

The invention discloses a method for preparing gasified coal water slurry by utilizing lignite, comprising the following steps: isolating the lignite which is taken as a raw material from air and heating at the temperature of 600-900 DEG C to obtain a lignite semicoke product suitable for preparing the coal water slurry, coal tar and retort gas; taking the lignite semicoke; grinding the lignite semicoke in a ball grinding mill into two kinds of coke powders with different particle sizes; grading the two kinds of ground coke powers in different proportion and evenly mixing to prepare a stand-by pulping raw material; adding naphthalene additive and water in the stand-by pulping raw material; and stirring to prepare the lignite coal water slurry. In the method of the invention, dry distillation process is utilized, firstly tar with high addition value in the lignite is extracted to obtain high-quality retort gas and simultaneously obtain lignite semicoke the structure and the performanceof which are beneficial for pulping, thus improving the utilization value of the lignite and realizing the comprehensive utilization of the lignite.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a method for preparing gasification coal-water slurry by utilizing lignite. Background technique [0002] Coal gasification technology is one of the core technologies for clean coal conversion, and is the basis for the development of process industries such as coal-based chemicals, coal-based fuels, IGCC power generation, and fuel cells. Among many coal gas technologies, coal-water slurry gasification technology has become the mainstream direction of coal gasification technology. At present, the gasification coal-water slurry mostly uses coal with a low degree of metamorphism (non-stick coal, long-flame coal, lignite) as the raw material. [0003] With the shortage of high-quality coal resources in my country, the price of high-quality bituminous coal with good pulpability has risen, and the cost of coal-water slurry pulping has increased significantly. The preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32C10B53/00C10J3/46
CPCY02E20/18
Inventor 初茉朱书全杜万斗朱攀中周玲妹
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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