A wet coal pre-drying system and method based on residual energy utilization

Abstract

The invention provides a wet coal pre-drying system and method based on waste energy utilization. The system comprises a first preheating bin, a second preheating bin, a heat source conduction deviceand a waste heat recovery device, an outlet of the bottom of the second preheating bin communicates with an inlet of the top of the first preheating bin through a material falling pipe, the heat source conduction device comprises a first heating coil pipe and a second heating coil pipe, a heat source medium enters the first heating coil pipe through a heat source inlet pipe and is discharged froma heat source outlet pipe, a first steam pipe is arranged at the top of the first preheating bin and is connected to the second heating coil pipe, an outlet is connected to a second steam pipe, a third steam pipe is arranged at the top of the second preheating bin, and the waste heat recovery device comprises a steam recovery pipe, a steam circulating pipe and a condensate water recovery pipe andrecovers steam and condensate water separately. According to the system has the method, new coal is preheated by utilizing the steam generated in the drying process, and therefore the use efficiency of steam waste energy is improved.

Description

technical field [0001] The invention belongs to the technical field of coking, and in particular relates to a wet coal pre-drying system and method based on residual energy utilization. Background technique [0002] Coking coal generally contains more than 10% moisture, and it is directly put into the furnace for coking to produce a large amount of coking wastewater that is difficult to treat, and at the same time consumes a large amount of high-quality energy in the dehydration of the coke oven. With the increasing requirements for environmental protection, pre-drying and dehydration coking outside the furnace is an effective method that is more environmentally friendly and energy-saving. At present, pre-drying and dehydration at home and abroad mainly focus on the indirect heat exchange between flue gas or steam and wet coal in the rotary kiln. This process has the inconvenience of large equipment volume, large area occupation, high investment, and energy utilization effic...

AI Technical Summary

Problems solved by technology

At present, pre-drying and dehydration at home and abroad mainly focus on the indirect heat exchange between flue gas or steam and wet coal in the rotary kiln. lower

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