Method for coal conversion and apparatus for implementation thereof

Abstract

The invention relates to coal conversion, and in particular, to the production of thermal power and high-calorific solid fuel (coke) out of coal for metallurgy, power production, and other industries. The method uses 0-35 mm coal particles as initial raw material, the coal conversion being performed in two steps of fluidized bed heat treatment. At the first step, the raw material is thermally oxidized at 650-800° C. with air supply, and at the second step the coke product is cooled by supply of water steam or chilled flue gases. The apparatus for embodying the method includes a boiler where a furnace comprises two fluidized-bed sections separated with a barrier, the first section being supplied with air, and the second section being supplied with water steam or chilled flue gases.

1 - 2 . (canceled) 
     
     
         3 . A method of coal conversion in a fluidized-bed boiler made with a first and a second sections and a barrier separating said sections from each other, said method comprising the steps of:
 crushing coal to a fraction of 0-35 mm,   continuously feeding said first section of said boiler with said crushed coal   supplying air to said first section   subjecting said crushed coal to thermal-oxidative treatment at 650-800° C. in said first section, whereby coke particles are produced,   transferring said coke particles into said second section of said boiler,   supplying water steam or precooled flue gases to said second section, and   cooling said transferred coke particles with said water steam or flue gases,   to thereby produce high-calorific solid fuel and heat.   
     
     
         4 . A fluidized-bed apparatus for coal conversion according to a method as claimed in claim  1 , including a boiler comprising a first and a second section separated from each other by a barrier, wherein said first section is connected to a source of coal crushed to a fraction of 0-35 mm and to a source of air supply, operating temperature inside said first section being maintained at 650-800° C., and wherein said second section is connected to a source of water steam or flue gases.