Dedusting method and system for coal moisture control

• Main Authors: MA YINYUAN, LIU JIE, WANG PANSHI, ZHANG FUXING, CAO YINPING, CHENG LEYI, JIANG WEIZHONG, LI LIANGHUA
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2013
• Subjects: BLASTING; CHEMISTRY; DESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FORPRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FUELS; FURNACES; HEATING; KILNS; LIGHTING; LUBRICANTS; MECHANICAL ENGINEERING; METALLURGY; OVENS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; RETORTS; SEPARATION; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TRANSPORTING; WEAPONS

The invention provides a dedusting method and a system for coal moisture control. The method includes mixing flue gas from drier outlet with high-temperature coke oven flue gas, introducing into a bag dust collector, introducing coal dust from the dust bin of the bag dust collector into an ash discharge screw via a rotary ash unloading valve, humidifying the dried coal dust in a humidifying stirrer, discharging, and recovering. The ash discharge screw has gas seal and packing seal structure. The invention solves the problems of existing coal moisture control process, such as high flammability, explosiveness, dewing of flue gas induced difficulty in ash removal, and blocking of ash discharge system caused by formation of a large amount of water vapor due to contact of hot coal dust with cold water.