The invention discloses a quality-improving technique combining a low-rank
coal pneumatic
drying with a multi-tube revolving
destructive distillation and a
system for the same, wherein the technique comprises a
coal flow and a hot
smoke flow, and both of the
coal flow and the hot
smoke flow comprise a
drying process and a
destructive distillation process which are connected with each other; the
system comprises a gas flow
drying system and a multi-tube revolving
destructive distillation system which are connected with each other. The quality-improving technique combining a low-rank coal pneumatic drying with a multi-tube revolving destructive
distillation and the system for the same disclosed by the invention realize a
cascade efficient utilization for a high-temperature
smoke, and increase the energy
utilization rate of the whole system. The quality-improving technique combining a low-rank coal pneumatic drying with a multi-tube revolving destructive
distillation and the system for the same disclosed by the invention have the advantages of
high energy utilization rate, safe and
stable system, small treatment capacity for destructive
distillation gas, small treatment capacity for
coking wastewater, high yield of
tar, high calorific value of
coal gas etc. The quality-improving technique combining a low-rank coal pneumatic drying with a multi-tube revolving destructive distillation and the system for the same disclosed by the invention also can recover chemical raw materials such as
coal tar generated during a low-rank coal low-temperature destructive distillation process, and increase the comprehensive
utilization rate of coal. Via the technique, a powdery or granular semicoke which is low in volatile matter, high in low caloric value and good in stability is produced by a quality-improving technique using a low-rank coal low-temperature destructive distillation. The technique is suitable for producing a civil or industrial
coal gas with a medium caloric value by a quality-improving technique using a low-rank coal low-temperature destructive distillation.