Partial gasification of lignite in a bed with a pulsed reverse blast
The aim of this work is to develop a technology of thermal processing of brown coal to produce carbonizate with increased strength. Here are presented the results of an experimental study of the process of partial gasification of brown coal (grade 3B) in the bed apparatus with pulsating reversed blow. In previous work, it was shown that satisfactory strength of a particle (no less than 8 MPa compression) is achieved by limiting the heating rate, as well as, the maximum temperature of the heating medium. To provide these conditions, it was proposed to use partial gasification of the coal in the fuel-bed apparatus using a pulsating supply mode of an oxidant. Parameters of blowing: flow rate 0.022 m3/(m2 s); blowing period 25 s; stop blowing period 150 s. Under these conditions, the producing lignite coke had a crush strength in the range of 8–10 MPa. The product yield was 56%.