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

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

Active Publication Date: 2013-09-11
KAWASAKI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Experimental program
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Effect test

Embodiment

[0060] (first process)

[0061] The lignite (Lignite from Australia (Loy Yang lignite)) having the properties shown in Table 1 is coarsely pulverized using a hammer crusher so that the particles with a particle size of 3 mm or less are 90% by weight or more (the amount of particles passing through a sieve with a mesh size of 3 mm) The particles are 90% by weight or more of the whole lignite). The roughly pulverized lignite was put into an indirect heating dryer (a small steam tube dryer manufactured by Kawasaki Heavy Industries) and dried at 0.1 MPa and 180° C. for one hour to obtain dried lignite with a total moisture content of 10% by weight. The water vapor discharged from the indirect heating type dryer is cooled by a water-cooled condenser and recovered as condensed water.

[0062] [Table 1]

[0063] .

[0064] (second process)

[0065] Condensed water and a polystyrene-based dispersant were added to 3 kg of dry lignite, and then put into a wet ball mill (φ300 mm×L3...

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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 heating and drying coarsely ground low-grade coal, and recovering condensed water emitted from the low-grade coal as steam; and a second step for adding a dispersant and the condensed water obtained during the first step to the heated and dried low-grade coal, and forming a slurry using the wet-grinding method. In addition, this low-grade coal slurry production device has: a drying device for heating and drying the coarsely ground low-grade coal; a condensed water recovery device for recovering condensed water emitted from the low-grade coal as steam through the heating and drying; and a wet-grinding device for adding the condensed water and the dispersant to the heated and dried low-grade coal, and forming a slurry.

Description

technical field [0001] The present invention relates to a method and apparatus for producing a slurry of a fuel suitable for a pressurized gasifier from a low-grade coal such as lignite. Also, the present invention relates to a low-grade coal gasification system including a pressurized gasifier using such a slurry as fuel. Background technique [0002] In recent years, the consumption of energy resources around the world has been rapidly expanding, and the prices of oil, coal, and natural gas, which are major energy sources, have continued to rise. Therefore, how to effectively use these energy sources has become an important issue. [0003] Coal used as a general fuel is not only power generation efficiency and cost, but also high calorific value bituminous coal 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 tense worldwide. ...

Claims

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Application Information

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IPC IPC(8): C10L1/32C10J3/46
CPCC10J3/506C10J2300/0906C10J2300/0909C10J2300/093C10J2300/094C10L1/326
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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