SU924487A1

SU924487A1 - Fluidized bed furnace

Info

Publication number: SU924487A1
Application number: SU802977654A
Authority: SU
Inventors: Юрий Петрович Нехлебаев; Василий Васильевич Конев; Дмитрий Тарасович Бондаренко; Ольга Владимировна Зац; Геннадий Борисович Куклин
Original assignee: Донецкий научно-исследовательский институт черной металлургии
Priority date: 1980-09-08
Filing date: 1980-09-08
Publication date: 1982-04-30

Description

(54) ПЕЧЬ КИПЯЩЕГО СЛОЯ(54) BOILING LAYER FURNACE

1one

Изобретение относитс к эндотермическому , обжигу сыпучих материалов и может быть использовано. в металлургической, химической . промышлеиност х и промышленности строительных материалов.This invention relates to endothermic firing of bulk materials and can be used. in metallurgical, chemical. industry and construction materials industry.

Известна известково-обжигательна печь кип щего сло , производ ща известь фракции 12-25 мм.A fluidized bed lime kiln is known for producing lime of a fraction of 12–25 mm.

Печь содержит две зоны подогрева известн ка, зону обжига, две зоны охлаждени и производит известь со степенью обжига Ц.The kiln contains two zones of limestone preheating, a burning zone, two cooling zones, and produces lime with a degree of roasting of C.

Недостаток данной печи - повышенный расход топлива на процесс обжига,, так как не в полной степени используетс тепло отход щих из зоны обжига продуктов сгорани .The disadvantage of this furnace is the increased fuel consumption for the burning process, since the heat of the waste products leaving the burning zone is not fully utilized.

Наиболее близкой по технической сущности к предлагаемой вл етс известково-обжи1 ательна печь кип щего сло , содержаща зоны подогрева известн ка, зону о5;кига,зону охлалден1С , соединенные между собой перёточными устройствгши.The closest to the technical essence of the present invention is a calcined-burning furnace of a fluidized bed containing zones of limestone preheating, zone O5, Kig, cooled zone 1C, interconnected with drip glands.

Продукты сгорани , выход щие из зоны обжига проход т последовательно все зоны подогрева. Технологический воздух подаетс под решетку зоны охлаждени в полном объеме, необходи ,мрм. дл ведени процесса.Подогрев воздуха осуществл етс за счет физического тепла извести 21.Combustion products leaving the burning zone pass through all heating zones in succession. The process air is supplied under the grill of the cooling zone in full, as needed, mrm. for the process. The air is heated by the physical heat of lime 21.

Недостатком печи вл етс повышенный расход тепла на обжиг в силу неполной утилизации тепла уход щих из зоны обжига продуктов сгорани .The disadvantage of the furnace is the increased consumption of heat for firing due to incomplete heat recovery from the combustion products leaving the burning zone.

Цель изобретени - снижение расхода топ л ива I.The purpose of the invention is to reduce the consumption of top oil I.

10ten

Указанна цель достигаетс тем, что в печи кип щего сло с зонами подогрева материала, зоной обжига, зоной охлаждени , соединенными между собой переточными устройствами, This goal is achieved by the fact that in a fluidized bed furnace with material preheating zones, a firing zone, a cooling zone, interconnected by overflow devices,

15 содержащей трубопровод технологического воздуха, перва по ходу движени продуктов сгорани зона подогрева материала соединена трубопроводом с третьей зоной подогрева, подреще20 точное пространство второй зоны подогрева соединено с трубопроводом технологического воздуха, а ее надслоевое пространство соединено трубопроводом с надслоевым пространст25 вом зоны охлаждени .15, containing the process air piping, the first in the course of the combustion products movement, the material preheating zone is connected to the third preheating zone by a pipeline, the exact space of the second heating zone is connected to the process air piping, and its superlayer space is connected to the super cooling zone.

Claims

The combination of the first in the course of the movement of the combustion products of the preheating zone with the third provides the utilization of the combustion products leaving the firing zone. The material supplied via the transfer device from the third zone of heating to the second one fluidizes with a part of cold technological air by connecting the sublattice space of the second zone with the pipeline of the process air. Part of the process air is heated and transferred through the pipeline to the sub-grid space of the cooling zone. Thus, an excess of heat is supplied under the grid of the burning zone with part of the process air heated in the second heating zone 4, which leads to a decrease in heat consumption for the burning process. Part of the process air, in this case, can be heated to 500-600 ° C. The drawing shows a schematic diagram of the proposed fluidized bed furnace. . The furnace contains zones 1-3 for preheating the material, zone 4 for firing, zone 5 for cooling, overflow devices 6–9 between the zones of the furnace, sub-grid space 10 for zone 2 for heating, pipelines. 11 process air, pipes 12 and 13 for removal of the combustion products, heat exchanger Ij4, pipe 15 between the over-layer spaces of the heating and cooling zones 2, pipe 16 and 17 of the process air, sub-grid space 18 of the cooling zone 5, cold cylinder 19, pipe 20 between heating zones 1 and 3, superlayer spaces 21 and 22, respectively, heating zones 2 and cooling zones 5. The furnace is operated as follows. The material is loaded into the heating zone 3 and through the overflow devices 6-9, the zones 2 and 1 are heated in succession, the calcination zone 4, and the cooling zone 5. In the heating zones, the material is heated by combustion products leaving the calcination zone. Heat treatment takes place in the burning zone, and the finished product is cooled in the cooling zone. The fuel required for the process is supplied to the collector of the burning zone 4. The process air for fluidizing the material and burning the fuel is supplied from the blower and divided into streams. One stream required for cooling the finished product is fed through pipelines 17 and 11 to the sublattice space 18 of the cooling zone 5, the second process air flow through the pipe 16 is fed to the sublattice space 10 of the heating zone 2 Here the air is heated by the heat of the material . Further, the heated air is transferred through conduit 15 to the over-layer space of the cooling zone 5, and from there to the burning zone 4. Thus, heating a portion of the process air in the preheating zone 2 adds additional heat to the calcining zone 4 and reduces the fuel consumption per process. To reduce the degree of cooling of the material in the preheating zone 2, part of the process air can be preliminarily sent to the heat exchanger 14, heated by the combustion products with heat, and then supplied via conduit 13 to the sublattice space 10 of the preheating zone 2. . Combustion products leaving the firing zone 4, pass the preheating zone 1 and then, the preheat zone 2, are directed to the preheating zone 3. After the primary cleaning in the cyclone 19, the combustion products are sent to the secondary cleaning or through the pipeline 12 to the heat exchanger 14 to heat a part of the process air. Thus, the proposed technological scheme of boiling furnaces. . The layer can be carried out using heat exchanger 14 and without it. The main heat recovery of the combustion products after the burning zone is carried out in heating zones 1 and 3, and part of the process air is heated in the heating zone 2. The proposed design of the fluidized bed furnace allows for heating of process air in the heating zone 2. by reducing fuel consumption. . The invention of a fluidized bed furnace with material preheating zones, a firing zone, a cooling zone, interconnected by overflow devices, containing process air piping, characterized in that, in order to reduce fuel consumption, the first part of the material flow is connected by a pipeline with the third heating zone, the sub-grid space of the second heating zone is connected to the process air pipeline, and its over-bed space is connected to the pipeline by over layer cooling zone. Sources of information taken into account when examining 1. Referential information VNIIESM. Ser. Industry autoclave materials and local residents. Issue 8 M., 1976, p. 33-36.

2. Chemical Engineering Progress 11, 1963, p. 95-99.

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