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

摘要

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.