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Low-grade coal slurry production method, low-rade coal slurry production device, and low-grade coal gasification system

A technology of low-grade coal and manufacturing method, which can be applied in the manufacture of combustible gas, gasification process, granular/powder fuel gasification, etc., and can solve problems such as decreased energy efficiency

Active Publication Date: 2013-09-04
KAWASAKI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] When supplying coal as a slurry to a pressurized gasifier, low viscosity makes handling and transportation easier, but energy efficiency decreases when the slurry concentration (coal concentration) becomes low
In particular, in the case of low-grade coal such as lignite, since it has a higher moisture content than bituminous coal, energy efficiency decreases significantly when the slurry concentration decreases

Method used

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  • Low-grade coal slurry production method, low-rade coal slurry production device, and low-grade coal gasification system
  • Low-grade coal slurry production method, low-rade coal slurry production device, and low-grade coal gasification system

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Experimental program
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Embodiment

[0060] (first process)

[0061] The lignite (Loy Yang lignite) of the properties shown in Table 1 was coarsely pulverized using a jaw crusher so that particles with a particle size of 3 mm or less were 90% by weight or more (passed through a sieve with a mesh size of 3 mm). The particles are 90% by weight or more of the entire lignite). Water was added to the coarsely pulverized lignite to form a lignite-water mixture with 95% by weight of the lignite. 10 kg of this mixture was put into a high-temperature and high-pressure batch kneader with a volume of about 20 L equipped with a double-arm type kneading blade.

[0062] [Table 1]

[0063] .

[0064] Under the conditions of a pressure of 5.0 MPa and a temperature of 280° C., the lignite-water mixture was kneaded for one hour, and the lignite was subjected to non-evaporative dehydration and modification treatment. After the modification treatment, the lignite-water mixture (kneaded product) in a paste state is taken out fr...

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Abstract

The purpose of the present invention is to provide: a production method and production device with which it is easy to produce a low-grade coal slurry having a high slurry concentration and a low viscosity, and which is appropriate for gasification using a pressurized gasification furnace; and a gasification system provided with such a production device. This low-grade coal slurry production method has: a first step for performing a modification treatment on coarsely ground low-grade coal under high-temperature and high-pressure conditions; and a second step for adding water and a dispersant to the modification-treated low-grade coal, and forming a slurry from the low-grade coal using a wet-grinding method. In addition, this low-grade coal slurry production device has: a dry-grinding device for dry-grinding the low-grade coal; a high-temperature / high-pressure kneading device for performing a modification treatment on the dry-ground low-grade coal; and a wet-grinding device for adding the dispersant, and the water discharged from the low-grade coal during the modification treatment, and forming a slurry from the modification-treated low-grade coal.

Description

technical field [0001] The present invention relates to a method and apparatus for producing a slurry of fuel suitable for pressurized gasifiers from low-grade coal such as lignite. Furthermore, the present invention relates to a low-grade coal gasification system including a pressurized gasifier using such a slurry as a fuel. Background technique [0002] In recent years, the consumption of energy resources around the world is rapidly expanding, and the prices of oil, coal, natural gas, etc., which are the main energy sources, are constantly rising. Therefore, how to effectively utilize these energy sources becomes an important issue. [0003] As coal used as a general fuel, in addition to power generation efficiency and cost, bituminous coal with a high calorific value is used from the viewpoint of safety in logistics such as transportation and storage. However, with the economic growth of emerging countries, the supply and demand of bituminous coal has become tight worl...

Claims

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Application Information

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IPC IPC(8): C10L1/32C10J3/46
CPCC10L1/326C10J3/506C10J2300/0906C10J2300/0909C10J2300/093C10J2300/094
Inventor 高尾彰一西村元彦野中嘉治熊田宪彦木村宪幸森正一
Owner KAWASAKI HEAVY IND LTD
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