Application of Regenerative High Temperature Air Combustion Technology on Low-rank Coal Pyrolysis

Based on Regenerative High Temperature Air Combustion technology (RHTAC), a Regenerative Radiant Tube Combustor (RRTC) has been developed and adopted into Shenwu Pyrolysis Process (SPP). SPP is a new regenerative pyrolysis technology with heat-carrier-free rotating bed, which has been researched and developed to upgrade low-rank coal. To understand the RRTC function, a pilot plant has been constructed and used to investigate the effect of RRTC on the fume, reactor temperature distribution and pyrolysis products. The results show that low calorific value gas can be used as fuel, the heat loss in fume exhausted is low while thermal efficiency of the RRTC is greatly improved; the RRTC could realize accurate temperature control and the separation of volatile materials and fume in the reactor, so as to increase tar yield and improve gas quality. The tar yield is more improved; the gas contains high content of CH4 and H2. Moreover, heat-carrier-free rotating bed could solve some technical problems.