Discussion on utilization approach of coal slime and ganguebased on CFB power technology

PENG Guang-hu; QI Chuan-xi; ZHAO Kong-you

doi:10.11799/ce201705056

Abstract：The main energy status of coal source will not be changed in China in the short term,and coal production will be concentrated in large coal bases.With the gradual improvement of the national coal washing rate,coal slime and gangue yield substantially increase and storing up of coal slime and gangue is much more concentrated.At present,the extensive pattern of coal slime and gangue utilization such as mixing coal for sales,storing up around coal mine,generating power on site,cause low utilization rate,energy waste,pollution and destruction of the mine ecological environment,which is a problem that should be solved quickly.It has been proved by practice that circulating fluidized bed (CFB) power technology is the best and large-scale clean way to utilize coal with low calorific value such as coal slime and gangue.And it is also the most economical way to reduce the pollution caused by burning coal slime and gangue.With nearly thirty years' development of CFB power technology,the product series had been developed from small capacity with low steam parameters to large one with supercritical parameters.It had been tested by practice that CFB power technology was mature.Due to the slow development of large-scale CFB power technology in China,the proportion of small CFB units was large,and then the overall energy consumption and pollutant emission concentration of existing CFB units were high,not meeting the national's latest energy conservation and emission reduction policy.In the new situation,Shenhua Guoneng Group is leading the project of national key research and development program R&D and demonstration of ultra-supercritical CFB boiler technology,and explore the green development of coal slime and gangue.Then large-scale clean conversion and utilization of coal slime and gangue on site could be realized.It is of great promotion and demonstration significance to promote the upgrade and transformation of existing CFB units and the intensive,efficient and green development of coal in large-scale coal bases.