Rotary hearth furnace brown coal drying method and device

A drying method and technology of a rotary hearth furnace, applied in the directions of drying gas arrangement, heating device, drying solid materials, etc., can solve the problems of small heat exchange area, high manufacturing precision requirements, and huge equipment, so as to achieve simple equipment manufacturing, Controlling the effect of flexible, low-energy drying production

Inactive Publication Date: 2012-12-19
UNIV OF SCI & TECH LIAONING
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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

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  • Rotary hearth furnace brown coal drying method and device
  • Rotary hearth furnace brown coal drying method and device
  • Rotary hearth furnace brown coal drying method and device

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[0030] A method and device for drying lignite in a rotary hearth furnace, such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, the lignite drying heat source adopts superheated steam and high-temperature flue gas. 3 / h. Superheated steam and high-temperature flue gas are supplied in sections, divided into a heating section, a second heating section, a third heating section, a drying section and a heat preservation section. The temperature of each section: the first heating section is 180-200°C; The three heating sections are 150-180°C; the drying section is 180°C; the holding section is 150°C. The exhaust gas temperature is 130-150°C.

[0031]The drying device consists of charging system 1, feeding port 2, rotating furnace bottom 3, furnace wall 4, furnace roof 5, high temperature flue gas and superheated steam inlet 6, material turning and flue gas injection system 7, exhaust gas outlet 8, Furnace bottom driving system 9, furnace bottom support rol...

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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...

Claims

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Application Information

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IPC IPC(8): F26B3/00F26B17/30F26B23/10F26B21/14
Inventor 杨金鼎戚丙申王骥李建江
Owner UNIV OF SCI & TECH LIAONING
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