Rotary hearth furnace brown coal drying method and device

Abstract

The invention discloses a rotary hearth furnace brown coal drying method and a rotary hearth furnace brown coal drying device which can dry the brown coal at high efficiency and low consumption. The method comprises the following step of: taking overheated steam and high temperature flue gas as a brown coal drying heat source; taking equipment which takes a rotary hearth furnace as a core as a drying device, uniformly distributing the dried brown coal at the furnace bottom of the rotary hearth furnace through a reflection plate distributor; turning the brown coal layer through a turning mechanism in the process of rotating the furnace bottom, obtaining heat of the brown coal through heat exchange, and heating the brown coal. The device comprises a charging system, a feeding hole, a rotary hearth furnace bottom, a furnace wall, a furnace top, a high temperature flue gas and overheated steam inlet, a turning and flue gas injection system, an exhaust gas outlet, a furnace bottom driving system, a furnace bottom supporting roller, a furnace bottom centering roller, a discharging hole and a discharging system, wherein the turning and flue gas injection system comprises a fixing beam, an adjusting mechanism, a plough-shaped turning plate and a high temperature flue gas nozzle. The brown coal with wide particle size range can be directly dried, and large-scale, rapid and low-energy-consumption drying production of the brown coal is realized.

Description

technical field [0001] The invention belongs to the field of coal drying. The invention relates to a method and a device for drying lignite in a rotary hearth furnace. Background technique [0002] Lignite is a relatively young type of coal, which has the characteristics of high water content (20-50%), high volatile matter, low calorific value, and easy spontaneous combustion. Therefore, the mining and utilization of lignite are greatly restricted. The high moisture content of lignite results in low combustion efficiency and increased greenhouse gas emissions year-on-year. Reduces the economics of power or chemical projects using lignite as energy or feedstock. Research results at home and abroad show that how to get rid of the water in lignite and improve its economy is an important way to use lignite economically. [0003] At present, the drying technology of lignite can be roughly divided into evaporative dehydration technology and non-evaporative dehydration technolo...

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Problems solved by technology

But there are also the following defects. The raw coal is relatively concentrated in the cylinder, the heat exchange area is relatively small, the equipment is relatively large, and the production accuracy is high.

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